CN104941531A - Cooling coil designed for oxidation reactor or ammonia oxidation reactor - Google Patents
Cooling coil designed for oxidation reactor or ammonia oxidation reactor Download PDFInfo
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- CN104941531A CN104941531A CN201410125032.4A CN201410125032A CN104941531A CN 104941531 A CN104941531 A CN 104941531A CN 201410125032 A CN201410125032 A CN 201410125032A CN 104941531 A CN104941531 A CN 104941531A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/24—Preparation of carboxylic acid nitriles by ammoxidation of hydrocarbons or substituted hydrocarbons
- C07C253/26—Preparation of carboxylic acid nitriles by ammoxidation of hydrocarbons or substituted hydrocarbons containing carbon-to-carbon multiple bonds, e.g. unsaturated aldehydes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D13/00—Heat-exchange apparatus using a fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
Abstract
The invention relates to a cooling coil designed for an oxidation reactor or an ammonia oxidation reactor. The cooling coil used for the commercial oxidation reactor or the ammonia oxidation reactor can be more tightly packaged through limiting an independent circuit of the cooling coil by providing transversal arrangement instead of linear arrangement.
Description
Background technology
Known for the manufacture of the various technique of acrylonitrile and methacrylonitrile and system.The common process hydrocarbon be usually directed to by being selected from the set be made up of propane, propylene or isobutene, ammonia and oxygen directly reacts recovery and the purification of the acrylonitrile/methacrylonitrile of generation in the presence of a catalyst.Such as, in the business of acrylonitrile manufactures, propylene, ammonia and oxygen react according to following reaction scheme one:
CH
2=CH-CH
3+ NH
3+ 3/2 O
2→ CH
2=CH-CN + 3 H
2O
This process being commonly referred to ammoxidation performs with gas phase at the temperature (such as, 350 DEG C to 480 DEG C) raised when there is the fluid bed ammoxidation catalyst be applicable to.
Fig. 1 shows the typical acrylonitrile reactor for performing this process.As shown here, reactor 10 comprises shell of reactor 12, air grid 14, supply sprinkler 16, cooling coil 18 and cyclone separator 20.At normal operation period, process air is filled with in reactor 10 through air intake 22, and the mixture of propylene and ammonia is filled with in reactor 10 through supply sprinkler 16 simultaneously.Both flow velocitys are high enough to ammoxidation catalyst bed 24 fluidisation made in inside reactor, and propylene and the ammonia catalytic ammoxidation to acrylonitrile occurs at this place.
The product gas produced by reaction exports 26 through reactor effluent and leaves reactor 10.Before doing so, they are through cyclone separator 20, and cyclone separator 20 removes any ammoxidation catalyst for getting back to catalyst bed 24 through dipping tube 25 that these gases may carry.Ammoxidation is highly heating normally, and therefore therefore reaction temperature, for extracting excessive heat, and is remained on suitable level by cooling coil assembly 18.
In this regard, Fig. 2 schematically shows the design of the conventional chilling coil pack 18 for this object.Fig. 2 is the localized axial cross-sectional view of reactor 10, it illustrates one group of cooling coil in the cooling coil assembly of reactor 10, this group cooling coil is made up of three independent cooling coils (cooling coil 42, cooling coil 44 and cooling coil 46).Cooling coil 42 comprises the entrance 48 for receiving cooling water and the outlet 50 for discharging this cooling water after being heated and being partly transformed into steam.Equally, cooling coil 44 comprises entrance 52 and outlet 54, and cooling coil 46 comprises entrance 56 and outlet 58.As shown in Figure 2, cooling coil 42, each in 44 and 46 limits by a series of vertically directed cooling coil circuit 57, and each circuit is formed by a pair microscler interconnection cooling duct 60, and this cooling duct 60 place bottom it rolls over accessory 62 by lower U-bend and is connected to and goes up each other.Continuous print cooling coil circuit 57 also its top place by U-bend roll over accessory 63 and be connected to and go up each other, to form the continuous-flow path from the entrance of each corresponding cooling coil to outlet.
Fig. 3 is the top view of the cooling coil assembly 18 shown in Fig. 2.As by recognizing from Fig. 2 and Fig. 3, cooling coil 42,44 and 46 forms one group of cooling coil, and it is coplanar, that is, each is arranged in common vertical plane.As further shown in Figure 3, cooling coil assembly 18 forms by organizing these cooling coils more, wherein each group of these cooling coils be all arranged to parallel to each other substantially and (alternatively) be equally spaced each other.In addition, as can be seen further in figure 3, although the many cooling coil groups in this cooling coil assembly comprise three different cooling coils, other cooling coil group comprises two or four cooling coil, and two cooling coil groups comprise an only cooling coil.
Fig. 4 is the amplification top view intercepted on the line 4-4 of Fig. 2, shows the more details of the ad hoc structure of the cooling coil assembly 18 of Fig. 2 and Fig. 3.Specifically, Fig. 4 is the schematic diagram of the upper U-bend folding accessory 63 that cooling coil is only shown.
As shown in Figure 4, cooling coil 61 comprises entrance 35, the supply line 64 be connected to by entrance 35 on the top of the first cooling coil circuit (not shown) of cooling coil 61, and for the continuous coil pipe connection of cooling coil is rolled over accessory 63 to a series of upper U-bend gone up each other.Also as shown in the drawing, all these elements (that is, all upper U-bend folding accessories 63 and supply line 64) are all coplanar, that is, they are allly all positioned on identical common vertical plane D.In addition, from Fig. 2 and Fig. 3 by what recognize further be, all the other elements (that is, the vertically directed cooling duct 60 forming each cooling coil circuit 57 and the lower U-bend folding accessory 62 be associated) in this cooling coil are also arranged in this common vertical plane.In shown specific embodiment, on each, U-bend folding accessory 63 is supported from below by backbar 70, and backbar 70 is received in the inner curve limited by each U-shaped accessory.Therefore, comprise its component parts all (namely, upper U-bend folding accessory 63, vertically directed conduit 60 and lower U-shaped bending part 62) and the total weight of each cooling coil of entire contents (that is, the cooling water of circulation) of cooling coil supported by its corresponding backbar 70.
As further shown in Figure 4, be applicable to aisle or passage 74 be arranged in certain altitude place between a cooling coil, this height near upper U-bend folding accessory 63 place or its, to provide easy to be close, and the making regular check on and/or any attendant that REPSH repair shop needs of supporting cooling coil.
Fig. 5 is another schematic diagram, it illustrates the different cooling coils in how controlled cooling model coil pack 18.In this regard, be make cooling coil " in turn " in the convention of the run duration of conventional propylene nitrile reactor 10, that is, regularly close independently and continuously and then restart each cooling coil.Most of business ammoxidation catalyst makes molybdenum refining, as incrustation on the outer surface that molybdenum is generally deposited on cooling coil within a certain period of time.Because this molybdenum incrustation adversely affects the performance of cooling coil, thus required be often remove this molybdenum incrustation suitably to act on to keep cooling coil.Generally speaking, this is by regularly closing and then restart each cooling coil, this is because this closedown/reset routine due to close and then restart cause cooling coil experience wide temperature fluctuation and cause to cooling coil be not inapparent mechanical shock.This mechanical shock is in most of the cases enough to remove at least some molybdenum incrustation that may be deposited on cooling coil surface, and has recovered at least some thermal heat transfer capability of this coil pipe in the case.Which results in the stable operation in the time period of prolongation.
In order to by chilled(cooling) water supply (CWS) extremely independently cooling coil, generally use the structure shown in Fig. 5.As shown there, the entrance 35 of cooling coil 61 is communicated with process water inlet header 80 fluid, and the height of process water inlet header 80 is positioned to usually lower than upper U-bend folding accessory 63.Equally, the outlet 65 of cooling coil 61 is communicated with process water outlet header 62 fluid, and the height of process water outlet header 62 is positioned to usually higher than upper U-bend folding accessory 63.Generally speaking, process water inlet header 80 and outlet header 82 adopt Perfect Ring around the conduit forms of the larger continuous horizontal ground orientation of reactor 10.Regularly close independently and restart each cooling coil generally by having come to the corresponding cut-off valve 84 that the entrance 35 of this cooling coil is associated, in great majority design, this cut-off valve 84 is simple switch valve, with can the control valve of precise hard_drawn tuhes rate of flow of fluid contrary.
Be also noted that, cut-off valve 84 is at least one valve in the cooling coil 61 between process water inlet header 80 and process water outlet header 82.That is to say, cooling coil 61 is configured to, without any additional valve or other flow control apparatus, particularly not export 65 flow control valves be associated with cooling coil.This is because this type of additional valve need not realize the operation and control of the expectation of cooling coil in the manner described above.In addition, elimination output flow control valve also eliminates the needs to safety relief valve, uses this output flow control valve else if, just will need safety relief valve (that is, by the PSV on each independent coil pipe of needs).
On whole reactor as a whole and from the district of in reactor to another district, acrylonitrile reactor is remained in or be important close to its optimal reaction temperature for good reactor performance.In addition, because heat normally can determine the rate-limiting step of the heap(ed) capacity that acrylonitrile reactor can run from the speed of reactor extraction, therefore good cooling coil design is also important.In addition, poor cooling coil design and/or operation can cause excessive cooling coil corrosion, and this can need very expensive premature repairs.
Therefore, constantly need the improvement of the design and running of the cooling coil of commercial propylene nitrile reactor, not only improve reactor performance, and reduce the erosion of conduit, thus power generating ratio time and repair cost.
Summary of the invention
According to the present invention, to for typical oxidation reactor or ammonia oxidation reactor, the design and running as the cooling coil assembly of commercial propylene nitrile reactor has carried out a series of improvement.As a result, not only improve reactor performance, but also extend the service life of cooling coil assembly.
Therefore, in one embodiment, the invention provides a kind of cooling coil assembly for removing the excessive heat generated by oxidation reactor or ammonia oxidation reactor, this cooling coil assembly comprises multiple cooling coil, each cooling coil includes multiple cooling coil circuit, it is fluidly connected in series to and goes up each other, to limit the cooling water path with cooling water inlet and coolant outlet, each cooling coil circuit limits vertically directed cooling coil track plan, wherein each cooling coil extends towards the periphery of reactor along corresponding vertically directed main cooling coil plane in reactor, and further wherein, at least some cooling coil circuit at least one cooling coil is arranged such that the main cooling coil flat transverse of its cooling coil track plan and this cooling coil.
In addition, in a second embodiment, the invention provides a kind of cooling coil assembly for removing the excessive heat generated by oxidation reactor or ammonia oxidation reactor, cooling coil assembly comprises single or multiple cooling coil, each cooling coil is all defined for the flow of cooling water path of the cooling water being carried through this place, cooling water inlet and coolant outlet, each cooling coil also comprises the condensate water cutoff valve be associated with its cooling water inlet, each cooling coil is also not used for the valve controlled through the cooling water flow of its coolant outlet, wherein the length of at least some flow of cooling water path is different from each other.In this regard, the cooling coil of some is selected to provides about 15% or less average percent being transformed into the cooling water of steam.
In addition, in the third embodiment, the invention provides a kind of cooling coil assembly for removing the excessive heat generated by the oxidation reactor or ammonia oxidation reactor with wall, this cooling coil assembly comprises single or multiple cooling coil, each cooling coil includes multiple cooling coil circuit, it is fluidly connected in series to and goes up each other, to limit cooling water path, this cooling water path has cooling water inlet through the wall of reactor and coolant outlet, wherein cooling water inlet comprises the cooling coil inlet fitting be attached to rigidly on the wall of reactor, and the thermal sleeve in the accessory of cooling water inlet, wherein the external diameter of thermal sleeve is less than the internal diameter of cooling coil inlet fitting, to limit heat space therebetween.
In another embodiment, the invention provides a kind of cooling coil assembly for removing the excessive heat generated by oxidation reactor or ammonia oxidation reactor, this cooling coil assembly comprises multiple cooling coil, each cooling coil includes a series of cooling coil circuit, this circuit comprises the first line of serial beginning and the last circuit in serial end, be connected to multiple cooling coil circuit fluid and go up each other, to limit the cooling water path with cooling water inlet and coolant outlet, cooling coil assembly also comprises the cooling coil inlet header be communicated with the first line fluid of each cooling coil and the coolant outlet collector be communicated with the last circuit fluid of each cooling coil, each cooling coil also comprises the coolant outlet conduit be connected with coolant outlet collector by the last circuit of this cooling coil, wherein the height of cooling coil outlet header is lower than the height of the cooling coil delivery channel of each cooling coil.
Accompanying drawing explanation
The present invention more easily understands by reference the following drawings, in the accompanying drawings:
Fig. 1 shows for performing propylene and the ammonia routine business acrylonitrile reactor to the ammoxidation of acrylonitrile;
Fig. 2 illustrates the structure of conventional chilling coil design for the routine business acrylonitrile reactor in Fig. 1 and the schematic diagram of operation;
Fig. 3 is the top view of the conventional chilling coil design of Fig. 2;
Fig. 4 is the top view being similar to Fig. 3 of the more details of the conventional chilling coil design that Fig. 2 is shown;
Fig. 5 is the schematic diagram being similar to Fig. 2, but shows single cooling coil 61 and its operation method;
Fig. 6 and Fig. 8 is the schematic diagram of fisrt feature of the present invention, and wherein the cooling coil of routine business acrylonitrile reactor encapsulates more closely than in conventional design;
Fig. 7 is the top view being similar to Fig. 2 and Fig. 4, and the upper U-bend that illustrate only a cooling coil of the conventional design comprising folding accessory of U-bend on these and these figure aligned with each other is rolled on accessory 63, Fig. 7 line 7-7 in Figure 5 and intercepted;
Fig. 9 is the schematic diagram that can be used for the cooling coil of Fig. 6 and Fig. 8 to be suspended on the cooling coil suspender on its supporting structure;
Figure 10 is the schematic diagram of another feature of the present invention, wherein thermal sleeve for the protection of the entrance of cooling coil and this cooling coil entrance through reactor wall joint; And
Figure 11 is the schematic diagram of another feature of the present invention, and the outlet header wherein for receiving cooling water and steam from cooling coil is repositioned onto the position at the top lower than these cooling coils.
Detailed description of the invention
In accordance with a first feature of the invention, have employed the novel arrangement of cooling coil, it can be increased in the encapsulation of the cooling coil in reactor.As a result, the total surface area provided by cooling coil assembly generally can increase effectively, this better overall control then causing again cooling coil to run, and result in the increase of total reactor capacity at least in some cases.
This feature is shown in Figure 6, and Fig. 6 is the schematic diagram being similar to Fig. 4, wherein it illustrates the layout of the upper U-bend folding accessory 63 of each cooling coil 61, and it is relative to the layout of the cooling coil backbar 70 of passage 74 and cooling coil assembly.Also see Fig. 7, Fig. 7 schematically shows the layout of the coil pipe circuit in the conventional design of Fig. 2, Fig. 3, Fig. 4 and Fig. 5.By it compared with Fig. 8, Fig. 8 is the schematic diagram being similar to Fig. 7, but shows the layout of the cooling coil circuit in the design of the present invention in Fig. 6.
As shown in Figure 6, the upper U-bend folding accessory 63 of cooling coil 61 is relative to each other arranged with offset relationship, but not with coplanar relation as shown in Figure 4.In conventional design as shown in Figure 4, cooling coil 61 extends to the periphery (that is, from position R to position S) of reactor 10 in reactor 10 along vertically directed plane D.For convenience's sake, vertically directed plane D is referred to herein as the main cooling coil plane of cooling coil 61.As further shown in Figure 4, all major components of cooling coil 61 (namely, all vertically directed cooling ducts 60 and all lower U-bends roll over accessories 62 and upper U-bend folding accessory 63) be all coplanar, that is, the meaning that their all hearts all wherein or axis are positioned in this plane is aimed at vertically directed main cooling coil plane D.This schematically shows in the figure 7 further, the lower U-bend folding accessory 62 that Fig. 7 shows coolant guide pipe 60 and cooling coil circuit 57 wherein in the heart or all meanings being all arranged in public vertically directed main cooling coil plane D of axis with aligned with each other.In addition, as further shown in Figure 4, passage 74 to be also arranged between these major components and to be parallel to these major components.
But in the design of the change of this aspect of the invention, at least some cooling coil circuit 57 of at least one cooling coil is arranged to the vertically directed main cooling coil flat transverse be generally positioned at cooling coil wherein.Generally speaking, all cooling coil circuits 57 of at least one cooling coil are arranged all in this way, and in certain embodiments, and all cooling coil circuits in great majority or even all cooling coils are arranged all in this way.
This layout more completely illustrates in fig. 8, Fig. 8 shows the corresponding cooling coil track plan Q that the coolant guide pipe 60 of each cooling coil circuit 57 of this design and lower U-shaped accessory 62 are arranged in himself, and its vertically directed main cooling coil plane D being arranged to be positioned at generally wherein relative to cooling coil 61 acutangulates α.Sharp angle α can be the angle of any expectation.On the one hand, angle is between about 30 ° to about 60 °, and another aspect is between about 40 ° to about 50 °.
As further shown in Figure 6, the backbar 70 of the total weight of carrying cooling coil 61 and content thereof is positioned to higher than U-bend folding accessory 63, but not lower than these U-bends folding accessory as in the conventional design of Fig. 2, Fig. 3, Fig. 4 and Fig. 5.In addition, as shown in Figure 9, the supporting suspender be applicable to is provided for and each U-bend folding accessory 63 is suspended on its backbar 70 be associated.
First advantage of the design of the change of this feature of the present invention is that cooling coil circuit 57 is comparable and encapsulates more closely in conventional design.This makes the effective surface area of cooling coil assembly utilize this design to come to increase relative to conventional design, and this then achieves larger cooling capacity compared to conventional design again and has the potentiality of larger temperature of reactor control.Cooling coil design as herein described provides more cooling coil circuits at every meter of reactor diameter.In this regard, coil design as herein described provides about 40 to about 60 cooling coil circuits and every meter of reactor diameter provides about 45 to about 55 cooling coil circuits is on the other hand effective for every meter of reactor diameter.
Second advantage of the design of this change is that the mechanical stress given owing to regularly closing and restart to the hardware of each cooling coil forming this design can utilize this design to adapt to better compared to conventional design.This is because the upper U-bend folding accessory 63 in design of the present invention is suspended on supporting arm 70 by suspender, and is also arranged to supporting arm 70 horizontal.Therefore, when the cooling coil of design of the present invention to expand in response to variations in temperature and shrinks, give to these cooling coils than stress less in other situation.This is because the signal portion of this expansion and contraction and these backbars laterally occur, and further because the suspender bolster of the movement be associated that is used as to absorb change in size and occurs between these cooling coil with backbar.
Therefore, due to this design development, not only likely increase when increasing and holding auxiliary equipment needed for this assembly the number of passage and backbar (and particularly) cooling capacity provided by cooling coil assembly, but also likely eliminate or at least essence reduce generally due to regularly close and restart cause give the mechanical stress to cooling coil and the cooling coil fault that occurs and the maintenance cost be associated.As noted, design as herein described provides more polydisc pipe.More polydisc Guan Kegeng is little circulates continually.
According to second feature of the present invention, the cross-sectional area of the flow passage in the different cooling coils of cooling coil assembly of the present invention is adjusted to the mean value making the cooling water inflow being transformed into steam in each cooling coil assembly have about 15% or less, on the other hand, be about 10% to about 15%.Desirably, based on the total amount of the cooling water through cooling coil, these cross-sectional areas are selected such that the cooling water inflow being transformed into steam in all cooling coils in this cooling coil assembly is not more than 5% with difference each other, desirably be not more than 4%, be not more than 3%, be not more than 2% or be not even greater than 1%.
As noted, cooling coil assembly can comprise cooling coil, and at this place, each cooling coil includes the cooling coil circuit of different number.Such as, cooling coil assembly can comprise cooling coil, and at this place, most of cooling coil has multiple cooling coil circuit (such as, 6 cooling coil circuits), and some cooling coils only have a cooling coil circuit.Removing of cooling coil realizes productivity ratio, and the cooling coil circuit of the different numbers that can remove in cooling coil circulation provides the operational flexibility for keeping the productivity ratio expected.
As shown in particularly Fig. 2, the different cooling coils in typical commercial propylene nitrile reactor are the not all cooling coil circuit 57 all with identical number generally.As a result, some in these cooling coils have longer flow passage, and other has shorter flow passage.This feature can cause the uneven operation of cooling coil, because the time of staying of the cooling water in longer flow passage no doubt can be greater than the time of staying of the cooling water in shorter flow passage.As a result, than there being more cooling waters to be transformed into steam in shorter path in longer flow passage.This no doubt can cause the higher flowing velocity in the flow passage more grown, especially near its port of export.This can cause again the excessive erosion of the inorganic matter in the cooling water of these positions and other composition and precipitation (that is, precipitate and deposit) then.
As noted above, desirably according to this feature of the present invention, the quantity of steam generated in each cooling coil assembly has the mean value of about 15% or less, on the other hand, is about 10% to about 15%.That is to say, desirably the cooling water inflow being transformed into steam in each cooling coil assembly is not more than about 15% of the water being supplied to this cooling coil assembly, on the other hand, be about 10% to about 15%.Therefore, according to this feature of the present invention, the cross-sectional area of the flow passage of each cooling coil is selected such that when all cut-off valves 84 are in enable possition, the cooling water being transformed into steam in individual channel will at a value place as far as possible close to each other, this value is about 15% or less, and on the other hand, be about 10% to about 15%.In this regard, the quantity of steam of generation is calculated value.
The mode of most of cost effective of design business acrylonitrile reactor is by the pipe of same diameter to make each cooling coil, and controls each cooling coil with identical cut-off valve 84, that is, each control valve is identical with other.Therefore, that guarantees the region of the flow passage of each cooling coil is transversally selected to that to realize the simplest mode that water is transformed into steam be in the same manner be positioned in each cooling coil by applicable constriction, or at least in each cooling coil with shorter flow passage, desirably its arrival end or its port of export or both places or near.The relative length of given different flow passage and the therefore different time length that will be present in these different paths of cooling water, determine that the accurate size (if or do not use constriction, determine the relative cross sectional area of flow passage) of each constriction easily completes by conventional heat transfer calculations.
Third feature of the present invention has been shown in Figure 10.In conventional design as shown in Figure 5, the suction line 64 of cooling coil 61 is directly welded on the reactor wall 36 of reactor 10.As noted above like that, convention is by independently and regularly close continuously and then restart the cooling coil " in turn " that each cooling coil makes commercial propylene nitrile reactor.When cooling coil is closed, its temperature is accumulated towards the normal operating temperature of reactor fast, about 350 DEG C to about 480 DEG C.Then, when cooling coil is restarted by contacting with the cooling water of additional amount, its temperature is almost fallen back or immediately close to the boiling point of this cooling water.This cooling can give the thermal stress of essence to cooling coil 61, be especially welded to the position of reactor wall 36 at its suction line 64.Within a certain period of time, the thermal stress of this repetition can cause the mechanical breakdown of this position.
According to the invention of this feature, this problem crosses the reactor wall 36 of reactor 10 position by the suction line 64 thermal sleeve being arranged on cooling coil 61 is avoided.As shown in Figure 10, the thermal sleeve 59 be communicated with cooling coil suction line 64 is received in cooling coil inlet fitting 33, and this accessory 33 passes and is welded on the reactor wall 36 of reactor 10.The external diameter of thermal sleeve 59 is slightly less than the internal diameter of cooling coil inlet fitting 33, to limit heat space 75 therebetween, this heat space 75 is kept by shading ring 77.The Exit-edge of thermal sleeve 59 does not weld along 73 or is otherwise permanently fastened on cooling coil accessory 33, and therefore freely moves axially relative to this cooling coil accessory.
Utilize this structure, any thermal stress on the mechanical splice between the cooling coil suction line 64 substantial temperature change owing to closing at it and appearing at when restarting in cooling coil 61 occurred in other cases and reactor wall 36 is eliminated by the expansion of thermal sleeve 59 and contraction.As a result, the mechanical breakdown of crossing the cooling coil 61 of the position of the reactor wall 36 of reactor 10 at it can be avoided significantly.
According to another feature of the present invention, be provided to receive the position being repositioned onto outlet line lower than each cooling coil and outlet header through the coolant outlet collector of the cooling water and steam of each cooling coil.On the one hand, coolant outlet is repositioned onto the position at the top of the cooling coil circuit lower than each cooling coil.
As shown in Figure 5, in conventional design, coolant outlet collector 82 is positioned to higher than coolant outlet pipeline 79 and U-bend folding accessory 63, and it limits the top of cooling coil circuit 67,69 and 71.As noted above, the cooling coil of routine business acrylonitrile reactor is regularly closed and is then restarted to remove any molybdenum incrustation that may be deposited on its outer surface.When close cooling coil time, remain in interior any cooling water because the temperature in acrylonitrile reactor is very high rapid evaporation.When it happens, due to the outlet valve be not associated with outlet line 79, therefore gravity causes the cooling water in outlet header 82 to flow back in the cooling coil of this closedown through cooling coil outlet line 79.This causes the cooling water evaporation of other additional amount, and is therefore transformed into the steam in cooling coil.
Cooling water generally comprises the inorganic matter of dissolving and additional process chemicals.When cooling coil is closed, these inorganic matters and process chemicals are tending towards separating out and being deposited on the inner surface of cooling coil, particularly at lower U-bend folding accessory 62.If especially cooling coil was closed for a long time, then these sedimental amounts may be essence, because this allows to flow back to from the cooling water of the essence additional amount of coolant outlet collector 82, and therefore evaporated from the cooling coil of this closedown.Within a certain period of time, this can cause the cross-sectional area of the flow passage in cooling coil (especially in these positions) to reduce significantly, and this causes increasing through the flow velocity essence of the cooling water of these positions.This can cause again the remarkable erosion of the cooling coil of these positions then, and therefore causes too early cooling coil fault.
According to this feature of the present invention, this problem by by coolant outlet collector 84 height be repositioned onto lower than outlet line 79 avoid.On the one hand, outlet header is positioned to the top of the last cooling coil circuit lower than at least one cooling coil, is more contemplated to be the last circuit lower than great majority or even all cooling coils.On the other hand, outlet header is positioned to the top lower than all cooling coil circuits at least one coil pipe, is more contemplated to be the top lower than all cooling coil circuits in all cooling coils.See Figure 11, Figure 11 schematically shows these features.
Utilize this layout, go up U-bend folding accessory 63 on the one hand and be positioned to too far away higher than outlet header 82 due to coolant outlet pipeline 79 and gravity can not be made to make the cooling water flow of any significant amount get back in the cooling coil of closedown, therefore substantially fully prevent the cooling water of additional amount by gravity from coolant outlet collector 32 to the backflow the cooling coil of closing.
Although be hereinbefore described only some embodiments of the present invention, it should be understood that and can carry out much remodeling without departing from the spirit and scope of the present invention.This type of remodeling all is all intended to be included in the scope of the present invention that is only limited by the appended claims.
Claims (24)
1. one kind for removing the cooling coil assembly of the heat generated by oxidation reactor or ammonia oxidation reactor, described cooling coil assembly comprises multiple cooling coil, wherein each cooling coil includes the multiple cooling coil circuits being fluidly connected in series to and going up each other, to limit the cooling water path with cooling water inlet and coolant outlet, each cooling coil circuit all limits vertically directed cooling coil track plan, wherein each cooling coil extends towards the periphery of described reactor along corresponding vertically directed main cooling coil plane in described reactor,
Cooling coil line arrangement described at least some wherein at least one cooling coil becomes to make the described main cooling coil flat transverse of its cooling coil track plan and this cooling coil.
2. cooling coil assembly according to claim 1, is characterized in that, all described cooling coil line arrangement at least one cooling coil becomes to make the described main cooling coil flat transverse of its cooling coil track plan and this cooling coil.
3. cooling coil assembly according to claim 1, is characterized in that, all described cooling coil line arrangement in all described cooling coils becomes to make the described main cooling coil flat transverse of its cooling coil track plan and this cooling coil.
4. cooling coil assembly according to claim 1, it is characterized in that, described cooling coil is parallel to each other substantially, wherein said cooling coil assembly also comprises the backbar for each cooling coil, each backbar is all arranged to higher than its corresponding cooling coil, and described cooling coil assembly also comprises and is arranged to each cooling coil is suspended on the cooling coil suspender on its corresponding backbar.
5. cooling coil assembly according to claim 1, is characterized in that, described cooling coil comprises about 40 to about 60 cooling coil circuits at every meter of reactor diameter.
6. one kind for removing the process of the heat generated by oxidation reactor or ammonia oxidation reactor, described process comprises cooling coil assembly is provided to described reactor, described cooling coil assembly comprises multiple cooling coil, wherein each cooling coil includes the multiple cooling coil circuits being fluidly connected in series to and going up each other, to limit the cooling water path with cooling water inlet and coolant outlet, each cooling coil circuit all limits vertically directed cooling coil track plan, wherein each cooling coil extends towards the periphery of described reactor along corresponding vertically directed main cooling coil plane in described reactor,
Cooling coil line arrangement described at least some wherein at least one cooling coil becomes to make the described main cooling coil flat transverse of its cooling coil track plan and this cooling coil.
7. process according to claim 6, is characterized in that, all described cooling coil line arrangement at least one cooling coil becomes to make the described main cooling coil flat transverse of its cooling coil track plan and this cooling coil.
8. process according to claim 6, is characterized in that, all described cooling coil line arrangement in all described cooling coils becomes to make the described main cooling coil flat transverse of its cooling coil track plan and this cooling coil.
9. process according to claim 6, it is characterized in that, described cooling coil is parallel to each other substantially, wherein said cooling coil assembly also comprises the backbar for each cooling coil, each backbar is all arranged to higher than its corresponding cooling coil, and described cooling coil assembly also comprises and is arranged to each cooling coil is suspended on the cooling coil suspender on its corresponding backbar.
10. process according to claim 6, is characterized in that, described cooling coil comprises about 40 to about 60 cooling coil circuits at every meter of reactor diameter.
11. 1 kinds for removing the cooling coil assembly of the heat generated by oxidation reactor or ammonia oxidation reactor, described cooling coil assembly comprises multiple cooling coil, each cooling coil is all defined for the flow of cooling water path of the cooling water being carried through this place, cooling water inlet and coolant outlet, each cooling coil also comprises the condensate water cutoff valve be associated with its cooling water inlet, each cooling coil is also not used for the valve controlled through the cooling water flow of its coolant outlet, wherein, the length of at least some in described flow of cooling water path is different from each other
Wherein, the cross-sectional area of the described flow passage of each cooling coil assembly is selected such that the average percent being transformed into the cooling water of steam in this cooling coil assembly is about 15% or less.
12. cooling coil assemblies according to claim 11, it is characterized in that, the average percent that the cross-sectional area of the described flow passage in each cooling coil assembly is selected such that to be transformed into the cooling water of steam in this cooling coil assembly is about 10% to about 15%.
13. cooling coil assemblies according to claim 11, is characterized in that, the described cooling coil in described cooling coil assembly comprises at least three different lengths.
14. cooling coil assemblies according to claim 11, it is characterized in that, described cooling coil is made by the conduit with substantially the same diameter, some in wherein said cooling coil are shorter than other in described cooling coil, and further wherein, those cooling coils with shorter length comprise limited part for controlling to be transformed into the percentage of the cooling water of steam at their flow passage.
15. 1 kinds for removing the cooling coil assembly of the heat generated by the oxidation reactor or ammonia oxidation reactor with wall, described cooling coil assembly comprises multiple cooling coil, each cooling coil includes the multiple cooling coil circuits being fluidly connected in series to and going up each other, to limit cooling water path, described cooling water path has cooling water inlet through the wall of described reactor and coolant outlet
Wherein, described cooling water inlet comprises and is attached to the cooling coil inlet fitting on the described wall of described reactor and the thermal sleeve in the accessory of described cooling water inlet rigidly, wherein the external diameter of thermal sleeve is less than the internal diameter of cooling coil inlet fitting, to limit heat space therebetween.
16. 1 kinds for removing the process of the heat generated by the oxidation reactor or ammonia oxidation reactor with wall, described process comprises cooling coil assembly is provided to described reactor, described cooling coil assembly comprises multiple cooling coil, each cooling coil comprises the multiple cooling coil circuits being fluidly connected in series to and going up each other, to limit cooling water path, described cooling water path has cooling water inlet through the wall of described reactor and coolant outlet
Wherein, described cooling water inlet comprises and is attached to the cooling coil inlet fitting on the described wall of described reactor and the thermal sleeve in the accessory of described cooling water inlet rigidly, wherein the external diameter of thermal sleeve is less than the internal diameter of cooling coil inlet fitting, to limit heat space therebetween.
17. 1 kinds for removing the cooling coil assembly of the heat generated by oxidation reactor or ammonia oxidation reactor, described cooling coil assembly comprises multiple cooling coil, each cooling coil includes a series of cooling coil circuit, it is included in the last circuit of the first line of the beginning of described series and the end of described series, be connected to described multiple cooling coil circuit fluid and go up each other, to limit the cooling water path with cooling water inlet and coolant outlet, described cooling coil assembly also comprises the cooling coil inlet header be communicated with the described first line fluid of each cooling coil and the coolant outlet collector be communicated with the described last circuit fluid of each cooling coil, each cooling coil also comprises the coolant outlet conduit be connected with described coolant outlet collector by the described last circuit of this cooling coil,
Wherein, the height of described cooling coil outlet header is lower than the height of the described cooling coil delivery channel of each cooling coil.
18. cooling coil assemblies according to claim 17, it is characterized in that, the described last circuit of at least one cooling coil limits top and bottom, and further wherein, and the height of described cooling coil outlet header is lower than the height at the top of the described last circuit of this cooling coil.
19. cooling coil assemblies according to claim 17, it is characterized in that, the top of the described cooling coil circuit of at least one cooling coil is connected to by corresponding upper U-bend folding accessory goes up each other, and further wherein, the height of described cooling coil outlet header rolls over the height of accessory lower than U-bend on these.
20. cooling coil assemblies according to claim 15, it is characterized in that, each cooling coil also comprises the entrance cut-off valve between the described first coil pipe circuit in described cooling water inlet collector and described series, and further wherein, each cooling coil is configured to not have any flow control apparatus between described last coil pipe circuit in described series and described coolant outlet collector.
21. 1 kinds for removing the process of the heat generated by oxidation reactor or ammonia oxidation reactor, comprise the cooling coil assembly leading to described reactor, described cooling coil assembly comprises multiple cooling coil, each cooling coil includes a series of cooling coil circuit, it is included in the last circuit of the first line of the beginning of described series and the end of described series, be connected to described multiple cooling coil circuit fluid and go up each other, to limit the cooling water path with cooling water inlet and coolant outlet, described cooling coil assembly also comprises the cooling coil inlet header be communicated with the described first line fluid of each cooling coil and the coolant outlet collector be communicated with the described last circuit fluid of each cooling coil, each cooling coil also comprises the coolant outlet conduit be connected with described coolant outlet collector by the described last circuit of this cooling coil,
Wherein, the height of described cooling coil outlet header is lower than the height of the described cooling coil delivery channel of each cooling coil.
22. processes according to claim 21, it is characterized in that, the described last circuit of at least one cooling coil limits top and bottom, and further wherein, and the height of described cooling coil outlet header is lower than the height at the top of the described last circuit of this cooling coil.
23. processes according to claim 21, it is characterized in that, the top of the described cooling coil circuit of at least one cooling coil is connected to by corresponding upper U-bend folding accessory goes up each other, and further wherein, the height of described cooling coil outlet header rolls over the height of accessory lower than U-bend on these.
24. processes according to claim 21, it is characterized in that, each cooling coil also comprises the entrance cut-off valve between the described first coil pipe circuit in described cooling water inlet collector and described series, and further wherein, each cooling coil is configured to not have any flow control apparatus between described last coil pipe circuit in described series and described coolant outlet collector.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410125032.4A CN104941531B (en) | 2014-03-31 | 2014-03-31 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
| JP2016559862A JP6616318B2 (en) | 2014-03-31 | 2015-03-26 | Cooling coil design for oxidation or ammoxidation reactors |
| EA201691908A EA032540B1 (en) | 2014-03-31 | 2015-03-26 | Cooling coil design for oxidation or ammoxidation reactors |
| PCT/US2015/022700 WO2015153274A2 (en) | 2014-03-31 | 2015-03-26 | Cooling coil design for oxidation or ammoxidation reactors |
| TW104110230A TWI659187B (en) | 2014-03-31 | 2015-03-30 | Cooling coil design for oxidation or ammoxidation reactors |
| SA516371955A SA516371955B1 (en) | 2014-03-31 | 2016-09-29 | Cooling Coil Design for Oxidation or Ammoxidation Reactors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410125032.4A CN104941531B (en) | 2014-03-31 | 2014-03-31 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104941531A true CN104941531A (en) | 2015-09-30 |
| CN104941531B CN104941531B (en) | 2018-06-12 |
Family
ID=52998221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410125032.4A Active CN104941531B (en) | 2014-03-31 | 2014-03-31 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP6616318B2 (en) |
| CN (1) | CN104941531B (en) |
| EA (1) | EA032540B1 (en) |
| SA (1) | SA516371955B1 (en) |
| TW (1) | TWI659187B (en) |
| WO (1) | WO2015153274A2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104941532A (en) * | 2014-03-31 | 2015-09-30 | 英尼奥斯欧洲股份公司 | Cooling coil designed for oxidation reactor or ammonia oxidation reactor |
| CN104941529A (en) * | 2014-03-31 | 2015-09-30 | 英尼奥斯欧洲股份公司 | Cooling coil designed for oxidation reactor or ammonia oxidation reactor |
| CN104941530A (en) * | 2014-03-31 | 2015-09-30 | 英尼奥斯欧洲股份公司 | Cooling coil designed for oxidation reactor or ammonia oxidation reactor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112144054B (en) * | 2020-08-27 | 2022-12-13 | 东南大学 | Laser cladding cooling device with fin type cooling fins |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2015153274A2 (en) | 2015-10-08 |
| EA032540B1 (en) | 2019-06-28 |
| EA201691908A1 (en) | 2017-02-28 |
| TW201541048A (en) | 2015-11-01 |
| WO2015153274A3 (en) | 2016-03-10 |
| JP6616318B2 (en) | 2019-12-04 |
| TWI659187B (en) | 2019-05-11 |
| CN104941531B (en) | 2018-06-12 |
| JP2017512641A (en) | 2017-05-25 |
| SA516371955B1 (en) | 2020-10-18 |
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