CN87102164A

CN87102164A - gas concentration method and device

Info

Publication number: CN87102164A
Application number: CN198787102164A
Authority: CN
Inventors: 萨穆利·莱蒂南
Original assignee: Aharpi Corp
Current assignee: Aharpi Corp
Priority date: 1986-02-12
Filing date: 1987-02-12
Publication date: 1987-11-25
Also published as: NL8720055A; AU7027887A; HUT47455A; BR8707581A; FI861189A0; JPH01501529A; GB2207616A; YU20387A; DE3790099T1; WO1987004946A1; FI861189A; SE8802881D0; DK531787D0; FI76003C; PT84283A; ES2002568A6; EP0294382A1; SE8802881L; GB8819148D0; DK531787A

Abstract

The present invention relates to a gas concentration method and a gas concentration unit, in particular for from air, isolating oxygen by absorption method.According to the present invention, at first use compressor (1) with air compression and with two jars of moisture adsorption unit (14,15) thus make dry air supply air for gas adsorption unit (34 ', 35), the dew point of feed air is about-40 ℃.Be guided forward and small portion oxygen rich gas input circulates again so that be bound to by removing that the nitrogen-rich gas on the sorbing material makes absorbing unit regeneration in the absorbing unit from most of oxygen rich gas of absorbing unit.

Description

Gas concentration method and device

The present invention relates to be a kind of by absorption gas is carried out concentration method and a kind of corresponding gas concentration unit; In particular for from air, isolate the method and apparatus of oxygen (gas) by adsorption.

Current, mainly contain two kinds in the method for industrial manufacturing oxygen (gas): the one, distillation method, the 2nd, absorption method.

At present, topmost method is the distillation of carrying out under high pressure (being generally 20-30Mpa) and low temperature condition, can promptly distill airborne different components (nitrogen, oxygen, argon etc.) as separated compressed liquid whereby.

Also oxygen can be separated from air with the method that is referred to as selective adsorption, the foundation of this method is, some material, and for example natural zeolite or synthetic zeolite have porousness, and theoretic pore size is 4

, and the molecular size of airborne molecule (for example oxygen molecule) is 3.8

, so these materials can be adsorbed on airborne differing molecular in its hole by physical adherence by different modes.

Such adsorption process normally realizes by so-called pressure oscillating absorption method (PSA), when using the PSA method by allow regeneration air stream pass sorbing material make each absorption phase after this sorbing material still effective, the flow direction of the flow direction of above-mentioned regeneration air stream and the feed gas stream that will be adsorbed is opposite.

In general, PSA equipment comprises two gas holders, and therefore, another jar then is used for regeneration when a jar is used for separated oxygen.In United States Patent (USP) 4194890 and 4263018, English Patent 2109266 had been described the relevant equipment of adsorption process therewith in the Finnish patent application 843014.

Water vapor can significantly reduce the ability of zeolite adsorption oxygen molecule, therefore, in Germany patent application 1265144 and 1259857, has advised using moisture eliminator in the european patent application 123911 and 128545 before absorption phase.

Above-mentioned these gas separating methods have many shortcomings.The structure of distillation plant bulky complex can be considered to the main drawback relevant with distillation method, so distillation plant is just expensive unusually from beginning.In addition, because transportation problem, it is complicated and expensive especially that the assignment problem of gas becomes, although because common operating pressure is approximately about 500Kpa, must and remain under the high pressure that is approximately 20Mpa gas compression in order to transport.The compression of gas needs lot of energy, has so just improved the production cost of gas.Other relevant shortcomings are exactly, owing to high pressure and owing to gas may leak from pressure-pot, so there is the potentially dangerous of exploding and catching fire at any time.

Now, use an adsorption device also few in the production.The main drawback of an adsorption device that comes into operation up to date is that obtainable oxygen content is big inadequately.The amount of oxygen that can get with present known equipment is about 60%, is up to 80%.But such oxygen content level must be above 90% at the oxygen content of these occasions to being fully not enough such as occasions such as medical or flame cutting.

Another significant disadvantages is that the adjusting and the Controlling System of psa process requirement is very complicated.In known devices, used equipment mainly is the functional element (as magnetic valve) of microprocessor-controlIed, electric or magnetic operation, but these elements all are unwell under humidity such such as marine filleting plant and/or cold conditions and use.

Main purpose of the present invention is to eliminate the shortcoming and defect relevant with existing separation method, and realizes that a kind of novel an adsorption device is used for gas concentration, especially produces oxygen from air.

Use method and apparatus of the present invention just can reach these purposes.In appending claims, mentioned each different feature of the present invention.

Basis of the present invention is so basic understanding, promptly this equipment will comprise as a combination: the parts that air compressed and joins this equipment, first adsorption element of dry compressed and supplied air, second adsorption element that preferred gaseous fraction is separated from send into air; The different piece of air-flow and equipment is by pneumatic element control and adjusting in addition.

Major advantage of the present invention is, whole device can be in all environment, therefore also can under moist and cold conditions, work accurately and reliably, this just helps to use air operated logic and air operated element, and, more much bigger than what obtain by the device that uses prior art by the oxygen content that uses this device to obtain.

Have reason on the one hand to emphasize at this, when using this term of air operated, mean pure pneumatically-operated those elements.Therefore, propulsion source can be a pressurized air, and control and adjusting parts do not comprise any type of electric elements.This also with said logic, promptly Controlling System is relevant, the element of Controlling System comprises with compressed-air controlled mechanical watch device and memory.

According to a most preferred embodiment of the present invention, Controlling System has integrated structure, and the major part in its element is arranged on the wiring board that is closed in the seal box.By use the available benefit of mixed circuit board technology in Controlling System is can produce millions of joints and can obtain very long working life.The benefit that is obtained by this settling mode is that Controlling System is not subjected to moist and cold influence.In addition, the requirement to pneumatic hose has reduced.Can affirm that in addition the use of pneumatics can not cause and anyly may produce the dangerous of spark and not need electrification yet, so this equipment of use is very safe.

According to optimal way of the present invention, the compressed and supplied air is crossed by two jars of adsorption dehumifiers are dry.Thereby the working condition of equipment, especially under the condition of humidity, obtained basic improvement with comparing than known solution early.

In order to isolate preferred gaseous fraction reliably, especially in order from air, to isolate oxygen, can be with different sorbing materials, for example silica gel, particularly synthetic or natural zeolite.What can be used as in natural zeolite that example puts forward is mordenite and mordenite/clinoptilolite.Suitable synthetics for example is A type and X type natrolite, as 5A and 13X.The metal ion that also may occur other in having the zeolite molecules structure of aluminium or sodium ion is as gallium ion or strontium ion.

Solution with prior art is compared, and the most outstanding advantage of the present invention is as follows:

1, compare with distillation method:

The price of-oxygen more cheap (depending on purity) is reduced to the 1/5-1/10 of current market value even;

-can avoid the transportation of oxygen in pressure bottle,

-can avoid oxygen compression to very high pressure;

2, compare with the absorption method of prior art:

-can obtain higher preferred gas, the especially content of oxygen or purity (surpass 90% even up to 98%),

-higher yield: the pressurized air in input is 1 * 10 ^-9Rice ³The oxygen yield of/timesharing is 1 * 10 ^-9Rice ³/ hour, (perhaps be 92% theoretical amount of oxygen 8%), and be 1 * 10 at the pressurized air of input ^-9Rice ³The oxygen yield of/timesharing is 2 * 10 ^-9Rice ³/ time (perhaps be 87% theoretical amount of oxygen 16%).

The numerical value of above-mentioned advantageous characteristic all is to obtain under the updrift side of this device feed airflow has been used the situation of two jars of adsorption dehumifiers.Moisture eliminator increases by about 10% air consumption, this just explanation yield may increase by 50% simultaneously under the purity level situation about improving a lot again production cost slightly increase.In order to improve operational possibility, output terminal at this device is equipped with a T-valve, the effect of this T-valve is that the further processing unit for two pressure provides an input unit, this unit or can under low-pressure state, use by day, or use under the situation of pressurize at night; For needing the pressure bottle inflation of mass consumption oxygen.

In the test of carrying out with pneumatic regulation unit of the present invention, confirmed, in the oceanic climate of cold, can carry out normal errorless running.In order to guarantee mechanical robustness, in equipment of the present invention, used stainless material widely.

With reference to the accompanying drawings, the present invention is described by means of each example of optimum implementation of the present invention, in these accompanying drawings:

What Fig. 1 represented is the general arrangement of first most preferred embodiment of the gas concentration unit of separated oxygen from air;

Fig. 2 is the logic relation picture of the pneumavalve of said first most preferred embodiment;

What Fig. 3 represented is the wiring diagram of the pneumavalve of said first most preferred embodiment;

Fig. 4 represents is the general arrangement of second most preferred embodiment of the gas concentration unit of separated oxygen from air;

Fig. 5 is the logic relation picture of the pneumavalve of said second most preferred embodiment;

What Fig. 6 represented is the wiring diagram of the pneumavalve of said second most preferred embodiment;

What Fig. 7 represented is the equipment that is used to improve the pressure of the oxygen of producing.

By Fig. 1 and Fig. 4 as can be known, compressor 1 is drawn air and supply with certain air capacity (=100%) with certain pressure (general 700-750Kpa) in the unit time from common air ambient.Then this air is guided to follow-up water cooler 2, water cooler 2 also can be included in the compressor 1.Because airborne moisture begins condensation, so this condenser is received on the drip pipe.After this, air is guided in the pressurized vessel 4, the size of pressurized vessel 4 is by the specification and the model decision of compressor 1.

Because the continuation of air cooling is so air also needs to continue condensation in pressurized vessel 4, so the accurate work that second drip pipe 5 guarantees pressurized vessel 4 will be set.Guiding is passed prefilter 6 removing water droplet from the air of pressurized vessel 4, and passes accurate filter 7 to remove airborne back spontaneously to two jars of type moisture adsorption moisture eliminators 14,15.Prefilter 6 and accurate filter 7 correspondingly are provided with drip pipe 8 and oily delivery pipe 9.If compressor 1 is not have oil, just can accurate filter 7 and oil exit pipe be set for this device.If this compressor is by oil lubrication, from the air of preparing to introduce

moisture eliminator

14,15, separate oil just extremely important, because if allow oil by

moisture eliminator

14,15, it is bad that the efficient of moisture adsorption material will become, and also will reduce greatly its work-ing life.

The aforesaid air that has been cleaned again by means of with one or another

jar

14,15 corresponding first main valves 10 and second main valve 11 are directed to moisture eliminator so that the generation dew point is about-40 feed air,

jar

14 and 15 all fills up the moisture adsorption material, as silica gel, a molecular sieve is housed all perhaps.Main valve 10 and 11 is all by programable automated installation 27 control based on MPU, and automated installation 27 is made of pneumatic logic by the present invention.If first jar (or tower) 14 is in drying stage, then first main valve 10 stays open state, and second main valve 11 that links to each other with second jar 15 is closed.During the absorption phase of first jar 14, second jar 15 is in the regeneration stage, during the regeneration stage, accumulates in second moisture in the jar 15 and is removed.When first jars 14 is in the moisture adsorption stage, the regeneration valve 12 that is connected to first jar 14 keeps closing conditions, and the regeneration valve 13 that is connected to second jar 15 is opened.For fear of noise effect, preferably regeneration valve 12 and regeneration valve 13 are passed to atmosphere again by

sound damper

17 and 16 respectively.

When dry air comes out from first jar 14, arrive at strainer 24 by check valve 20, this is because check valve 18 and 21 is in reverse fluid stopping direction.When dry air came out from second jar 15, the exsiccant air also flow to strainer 24, but flow through by check valve 21, and this is because check valve 19 and 20 is in reverse fluid stopping direction.Said dry air stream flows to this strainer 24 by

jar

14 and 15 successively, thereby jar is in the moisture adsorption stage and another jar is in the regeneration stage.Be used for another jar carried out the sub-fraction that the regenerated dry air accounts for dry air, in non-hot type moisture eliminator, be preferably 10-12%, and in the moisture eliminator that utilizes heating, be preferably 2-4%.This quantity of dry air is regulated with throttling valve 23 and is taken out by strainer 22 from the dry airflow of trunk.

If jar 15 is in the regeneration stage, because throttling valve 23 has reduced pressure, and this pressure is about 700Kpa after check valve 19.So dry air passes check valve 19 from throttling valve 23, the air admission jar 15 of regenerating then, this be because valve 21 after this pressure be about 700Kpa and because other direction be contained in the jar 15 bottoms outflow valve 13 be open and main valve 11 is closed.Therefore, regeneration air has just washed jar 15, and its mobile direction is opposite with the adsorption gas flow direction that produces in jar 14.In the regeneration stage, condensation is not taken place in the atmosphere by outflow valve 13 and sourdine 16.

Be in the pressure higher and remain unchanged basically (for example 700Kpa) in the absorption phase jar, the pressure that is in the regeneration stage jar reduces (for example reducing to normal atmosphere from 700Kpa) gradually.Scheduled time after drying stage begins in jar 14, preferably after 9 minutes, shut-off valve 13 is forbidden the gas outflow of jar 15, and therefore jar 15 begins pressurization.When two jars reached uniform pressure, main valve 10 and 11 adjustment position change came, and promptly valve 10 cuts out, and valve 11 is opened.Air from compressor 1 begins to flow by jar 15.Sometime, preferably after 9 seconds, outflow valve 12 is opened, and jar 14 interior pressure begin to descend whereby, and the regeneration stage just may begin.By alternately handling

jar

14 and 15 drying of air is able to continuously.

The effect of strainer 24 is to remove all dust that enter into dry air etc. from dry air.After strainer 24, the pressure of feed air is reduced to a suitable numerical value by pressure unit 25, and this numerical value is preferably about 500Kpa.Then, feed airflow quilt in jar 26 is balanced.

In first most preferred embodiment of the present invention, the feed air after jar 26, be introduced in two jars of gas adsorption units 34 ', 35 so that carry out continuous oxygen separation to the feed air.It is corresponding that gas adsorption unit flows into the unitary structure that flows into of the structure of head and two jars of moisture adsorption.Valve 28 and 29 is alternately to allow first jar of feed air admission 34 ' or the main valve of second jar 35, and this two jars 34 ' with 35 are identical.Accordingly, regulate from jars 34 ' and 35 rich nitrogen exhaust flows of discharging by

outflow valve

30 and 31.

Let as assume that, first jars 34 ' be in absorption phase, then main valve 28 and outflow valve 31 stay open state and main valve 29 and outflow valve 30 are closed, thus, the feed air flows into jars 34 '.To select sorbing material to make the flowing more hurry up of flowing of running through this material of oxygen according to the present invention than nitrogen.As previously mentioned, suitable material is natural zeolite and synthetic zeolite, and their pore dimension is no more than 4

In the exit, because check valve 40,39 is in reverse fluid stopping state, so oxygen can pass check valve 38 and flows to strainer 42 when valve is opened.After this, flowing of oxygen rich gas regulated by throttling valve 44, and rich oxygen is stored in the jar 45.

When first jars 34 ' when producing oxygen, promptly be in open mode and keep between 10 to 30 seconds sometime when valve 36, the time that preferably keeps about 15 seconds, the main valve 31 of second jar 35 produces from oxygen, also be opened for some time, typical case's time numerical value is 5 to 10 seconds, Best Times is about 8 seconds, whereby, just allow oxygen rich gas after valve 36, to pass safety relief valve 41 and flow into second jar 35 and pass outflow valve 31 again and sourdine 33 leads to atmosphere, so just from 35 separation of second jar and wash away nitrogen-rich gas from jar 35 beginnings.Certainly, be very little by sourdine 33 used up oxygen rich gass.

Fixed time when finishing, between 15 to 30 seconds, best 24 seconds, outflow valve 31 cut out, and promptly begins thus promptly to be through with and pressurizes since the outside dispatch of second jar 35 and to oxygen rich gas as shown in Figure 2 this time for separating nitrogen-rich gas.Typical clamping time is between 5 to 10 seconds, preferably be about 7 seconds, interrupted generation by shut-off valve 36 after at this moment at first jar 34 ' interior oxygen, meanwhile by open main valve 29 and close main valve 28 with jar 34 ' and 35 working order turn.Second 35 pairs in jar passes through the feed air pressurized that main valve 29 flows into then.

After this, typical situation is after about 11 seconds, and outflow valve 30 is opened, so first jar 34 ' begin by sourdine 32 to the atmosphere emptying, from first jar 34 ' with the gas venting of rich nitrogen.Usually opening main valve 29 in the time of about 16 seconds later on, second jar 35 interior pressure reached its maximum value, and its optimal values is about 500Kpa, and first jar 34 ' emptyings meanwhile are so that supercharging again.

Valve 37 is opened then, and second jar 35 promptly can begin to produce oxygen whereby.When oxygen production finishes, be preferably about 8 seconds, outflow valve 30 stays open state, make thus first jars 34 ' be in the regeneration stage.After this valve 30 that outflows cuts out, after this first jars 34 ' begin to work by above-described mode.A round-robin time promptly begins to finish the required time to the regeneration stage in another jar from the absorption phase in a jar, and typically between 50 to 100 seconds, optimal values is illustrated in figure 2 as about 84 seconds.

Mode with condensation in Fig. 2 has provided the

main valve

28 and 29 that is used to compress the feed air, be used to discharge the

outflow valve

30 and 31 and be used to produce the outlet valve 36 of oxygen rich gas and 37 work relationship synoptic diagram of nitrogen-rich gas, wherein reference number " 1 " is represented valve open, and reference number " 0 " expression valve closes.Thereby can being regulated smoothly, the operating time that provides to produce oxygen rich gas with desired purity in this figure.

Second most preferred embodiment of the present invention according to introducing in Fig. 4 is incorporated into single jar of gas adsorption moisture eliminator 34 with oxygen separation with dry feed air.One inflow end structure is similar in the structure of jars 34 inflow end and moisture eliminator jar 14 or 15.Valve 28 is main valves, and its controls the path of feed air admission adsorption tanks 34, and flow to atmosphere by flowing out the rich nitrogen discharge of valve 30 adjustings gas from these adsorption tanks, and this flowing also will be passed sourdine 32 sometimes.

Adsorption tanks 34 alternately or be in absorption phase or are in the regeneration stage.Let as assume that jar 34 at first is in absorption phase.Then main valve 28 remains on the state of opening, and outflow valve 30 is closed.According to be chosen in the sorbing material that exists in the jar 34 as the similar mode of first most preferred embodiment, make running through of oxygen flow and come hurry up than nitrogen.Have about 4

Natural or the synthetic zeolite of porosity is the material that suits.When outlet valve 36 was opened, oxygen rich gas just arrived at strainer 42 by check valve 38, and air-flow is regulated by throttling valve 43 after this.Oxygen rich gas enters hold tank 45 by safety relief valve 41 downwards.

When adsorption tanks 34 begin to produce oxygen rich gas, promptly stay open the state 10-30 time of second at valve 28, when being preferably 18 seconds left and right sides, outlet valve 36 also will stay open sometime before this absorption phase finishes, be preferably about 7 seconds, thereby allow gas to flow into hold tank 45, and can begin oxygen rich gas is pressurizeed by safety relief valve 41.Pressure in pressure dwell jar 45 rises to a certain numerical value that is preferably 500Kpa, ends the production of oxygen rich gas by closing outlet valve 36 after the pressurization.

After this, typical situation is after about 11 seconds, begin regeneration stage of adsorption tanks 34 by opening outflow valve 30, the regeneration stage is lasted 15 to 30 seconds, preferably be about 23 seconds, allow adsorption tanks 34 by sourdine 32 emptyings thus, and allow the nitrogen-rich gas that accumulates in the adsorption tanks 34 discharge.After sometime, typical situation is after about 16 seconds, and adsorption tanks just are drained.When the regeneration stage finished, the outlet valve 37 of outflow valve 30 and hold tank 45 will be opened for some time, and the typical time is about 7 seconds, therefore, just can make oxygen rich gas begin to pass safety relief valve 39 from hold tank 45, strainer 42, throttling valve 43 and safety relief valve 40 flow in the adsorption tanks 34.After this, when exsiccant feed air began to flow into adsorption tanks 34 and begin it is pressurizeed,

valve

30 and 37 cut out and main valve 28 is opened.This pressure process that finally is added to 500Kpa is typically lasted about 11 seconds, and adsorption tanks 34 beginnings are after this operated in the described mode in top.From typical recycling time that absorption phase begins to finish to the regeneration stage between 30 to 60 seconds, optimal values is about 52 seconds.

In Fig. 5, provide air fed main valve 28, discharged the outflow valve 30 of nitrogen-rich gas, be used for the operative relationship figure of oxygen rich gas production and oxygen rich gas regenerated outlet valve 36 and 37.The operating time that this graph of a relation provides can be regulated smoothly so that produce the oxygen rich gas of desired purity.

According to first and second most preferred embodiments, by opening shut-off valve 46 and the oxygen rich gas that is produced by select direct use of low pressure or high pressure supercharging use to take out with T-valve 51 from hold tank 45.In direct use-pattern (0-500Kpa), rich oxygen is directed to pneumatic control pump 49 and further is incorporated into distributing pipelines 50.In the high pressure supercharging mode, the pressure that the increase unit 70 by pneumatic control will be about the oxygen rich gas of 500Kpa from the pressure of hold tank 45 is brought up to the numerical value of expectation, for example is used for filling oxygen cylinder as shown in Figure 4.

For example can be used as with similar system of system shown in Fig. 7 increases unit 70, can be with increased pressure to 70Mpa with this system.The used element of such system can have been bought from SCHMIDT KRANTZ AND CO.GmbH on market, lists its each element below, and the code name of company is write in the bracket.Here listed compress cell comprises:

-at the first two-stage working cylinder 71(DLE5-30 of 200Kpa-32Mpa low pressure range work),

-at the second two-stage working cylinder 72(DLE75-1C of 3.5Mpa-70Mpa high pressure range work),

-be used as the tundish 74 of pressure accumulation cabinet, and be furnished with a safety relief valve 73, jar 74 is contained between the working

cylinder

71 and 72 of polyphone and sequential working,

-control working

cylinder

71 and 72 work control air unit 75, the exemplary value of controlled feed air pressure between 100Kpa-1.1Mpa,

First shut-off valve 76 of-manipulation first working cylinder 71 work,

-the second shut-off valve 77 and pressure regulator valve 78, they all handle the work of second working cylinder 72.

In first and second most preferred embodiments,, air operated timer and directional valve have all been used in 30,31,36 and 37 the control at valve 28,29.If the pressure in the absorbing unit has surpassed the maximum value that presets, in control, also come the cease operation circulation with a safety relief valve.This Controlling System is integrated, and the major part of pneumatic element all is contained on the wiring board, and so their all interconnective flow passages all are positioned on the said wiring board and have no longer needed pneumatic hose.Said pneumatic element all can have been listed these pneumatic elements below by can buy on market at the Oy of Finland FESTO Ab, and the product code name is placed in the bracket of said company.

As shown in Figure 3,

main valve

28 and 29 and

outflow valve

30 and 31 all be arranged to come the use of back rotation.In addition,

outlet valve

36 and 37 is arranged to the work that can walk abreast.Said these valves preferably all are diaphragm valve (VLX-2 types).The operation of the switch transition of these valves is by triggering valve 52(VLL-5-PR-3 type) control, trigger valve 52 and link pulse valve 53 and 54(J-3-3.3 type) in the circuit,

pulse valve

52 and 53 has an output terminal and a memory.The timer units of Controlling System is by four timing

units

55,56,57 and 58(VUZ type) form.These timing units all have air operated mechanical watch device, but can be production cycle setting desired time order by this clock apparatus.According to the mode shown in the wiring diagram, promptly regulate these timing units by the medium in the storage valve 53 and 54 and by direct control diaphragm type outlet valve 36 and 37.The pulse valve 59 direct

control timer unit

56 and 58 and the action that triggers valve 52 that two output terminals are arranged.

As shown in Figure 6, main valve 28 and outflow valve 30 are arranged to and can alternately work.In addition,

outlet valve

36 and 37 is arranged to and can works concurrently.Said these valves preferably all are diaphragm valve (VLX-2 types).The action of these valves is all by a triggering valve 52(VLL-5-PK-3 type) control, trigger valve 52 and be and as a transfer lever, work and be connected on the pulse valve (J-3-3.3 type), this pulse valve has output and working cycle memory.The timer units of Controlling System comprises four

timer units

55,56,57 and 58(VUZ type).These timer units comprise the pneumatic machinery clock apparatus, by these clock apparatus desirable time sequence can be set.These timer units are pressed the mode shown in the wiring diagram, promptly are conditioned by the medium in the storage valve 53 and by direct control diaphragm type outlet valve 36 and 37.The pulse valve 59(J-5-3.3 type that two output terminals are arranged) work of control timer unit and triggering valve 52.

Can reliably and accurately work in order to ensure the gas adsorption unit in first and second most preferred embodiments shown in Fig. 1 and Fig. 4, pressure transmitter is arranged on the absorbing unit, pressure transmitter is linked pressure regulator valve 62(VD-3-3.3) on, preferably selecting 800Kpa is upper limit of pressure.Pressure regulator valve 62 is linked the control valve 63(SV-3-M5-N-22-S of a manual regulation concurrently) and main shut-off valve 61(VL/0-3-3.3) on, main shut-off valve 61 link again " or " valve 60(OS-6/3-3.3) on, second control valve 64(SV-3-M5-N-22-S) also link " or " on the valve 60.

By said control valve 63(64) start this Controlling System, system's auto-action after starting,

-according to the sequence control valve that is set 28,29,30,31,36 and 38 shown in Figure 2, perhaps

-according to the sequence control valve that is set 28,30,36 and 38 shown in Figure 5.

If the increased pressure in the gas adsorption unit is excessive, shut-off valve 61 is just ended this circulation.But all can restart this circulation by control valve 64 or according to the pressure decline that produces by control valve 63.

This Controlling System is pneumatically-operated fully, preferably uses the pressurized air about 500-600Kpa.By being that well-known compressed air source (as compressor, not shown) utility appliance just can obtain pressurized air by itself, and with pressurized air by being incorporated into Controlling System by Fig. 3 and control

valve

63 and 64 shown in Figure 6.

As mentioning in early time, pneumatic element 52-62 is arranged on the wiring board, and this wiring board is placed on a seal box 47(27) in.

Control valve

63 and 64 preferably is contained in the outside of this box, a benefit of this arrangement be pneumatic hose only need be contained between these control valves and the wiring board and corresponding diaphragm valve and wiring board between.

The Controlling System of being made up of above-mentioned corresponding pneumatic element 52-64 preferably also can be used for controlling moisture adsorption unit, especially main valve 10 and 11 and the action of outlet valve 12 and 13.

Up to the present only invention has been described by means of two most preferred embodiments.All may be within appended claim scope except invention and/or its various flexible pattern, do not wish certainly by any way the present invention to be applied restriction.

The other parts of this device can be different with above-mentioned representative elements.May replace compressor with the previous pressurized air that obtains.Under the still identical as a whole situation of device, can make gas adsorption unit be adapted to different work numerical value by changing working cycle.Can copy two oxygen generation units in addition, one of them is perhaps more less, so just can obtain two-stage and separate, when separating with two-stage by allowing the gas stream of relatively large amount cross the purity that bigger unit just can improve oxygen.This arrangement is of great use when requiring higher degree.By changing sorbing material, come separating nitrogen or other constituent of air with regard to available this device, rather than separated oxygen.

Claims

1, a kind of gas concentration method by absorption in particular for isolate the method for oxygen from air, is characterized in that this method comprises following consecutive steps:

--air is compressed to a certain pressure, and the normal barometric point of this pressure ratio is much higher,

--discharge the water of condensation that causes by compression, and as much as possible with compressed air drying,

--pressurized air is incorporated into an absorbing unit, and absorbing unit contains sorbing material, and preferably natural or synthetic zeolite, this sorbing material are suitable for gas delivery become its part component,

--the major part of the oxygen enriched product gas that comes out from this absorbing unit at least, be directed forward, preferably be directed to a depositing element or user place, and

--be recycled to absorbing unit than small part oxygen enriched product gas and make this absorbing unit regeneration so that be bound in this absorbing unit the nitrogen-rich gas on the sorbing material by discharge,

The feature of said method also is said gas stream:

--be introduced in the pressurized air of this absorbing unit,

--the most of oxygen enriched product gas that comes out from this absorbing unit,

--be recycled to the small part oxygen rich gas in this absorbing unit,

--from the rich nitrogen waste gas of absorbing unit discharge,

All by pneumatic element control with regulate, therefore, realized isolating gaseous fraction safely and reliably by absorption method from air, even oxygen preferably is moist, cold and/or to have under the condition of explosion hazard also be reliable and secure.

2, a kind of as claimed in claim 1, with the two jars of methods that absorbing unit is implemented, it is characterized in that, the said startup moment and the flowing time than small part of product gas stream all determined by pneumatic element, control and regulate, less above-mentioned product gas since an adsorption tanks top or the outflow pipe be guided through another adsorption tanks so that make its regeneration.

3, a kind of as claimed in claim 1, the method of implementing by a single jar of absorbing unit, the startup moment and the flowing time than the small part that it is characterized in that said product gas stream are determined by pneumatic element, control and adjusting, above-mentioned less portioned product gas begins to be guided through these adsorption tanks so that make this adsorption tanks regeneration from middle hold tank.

4, any one described method among a kind of claim 1-3, it is characterized in that, the pressurized air that is separated water of condensation is directed at least one two jars of moisture eliminator so that be air-dried to a suitable humidity, preferably allow dried compressed-air actuated dew point about-40 ℃, above-mentioned moisture eliminator includes the moisture adsorption material, preferably silica gel or molecular sieve, the feature of this method also is

-enter the pressurized air stream of a moisture adsorption drying chamber,

-the major part that enters the dry air stream of adsorption tanks from a moisture adsorption drying chamber,

-enter another moisture adsorption drying chamber from a moisture adsorption drying chamber, be used for eliminating and be strapped in moisture on the moisture adsorption material so that make this jar regenerated small part dry air stream, and

-from the effusive airflow that has certain moisture of the moisture adsorption jar that is in the regeneration stage, all control by pneumatic element.

5, a kind of gas concentration unit in particular for isolate the device of oxygen from air, is characterized in that this device comprises the combination of following parts at least:

-be used to compress an air supply part (1) of feed air, compressor preferably,

-separating component (2-9) preferably is used in combination with said air charge parts, is used at least removing the water of condensation that the compression owing to air produces from said feed air,

-one moisture adsorption drier; It preferably includes two gas tanks (14 that are in successively the work of moisture adsorption stage; 15); Each gas tank or comprise suitable moisture adsorption material; Silica gel preferably; Perhaps comprise a molecular sieve; Said drier at said moisture content separating component (2-9) afterwards and according to producing the selectable running parameter of dried compressed air with drier optimization with the ratio of wanting dry material, circulation timei and other; Dry compressed-air actuated dew point is preferably in-40 ℃ approximately

-one gas adsorption unit (34 ', 35), it comprises that being adapted to pass through adsorption becomes the material of its various components with gas delivery, preferably is used for oxygen and the separated natural or synthetic zeolite of nitrogen that the feed air is existed,

-store the tank component (45 of the gas products (preferably oxygen rich gas) that obtains by said gas adsorption unit; 47),

-make the said various piece and the interconnective pipeline of air-flow tie point of this device, be used for being communicated with in said supply part (1) said separating component (2-9), said moisture adsorption moisture eliminator (14,15), said gas adsorption unit (34 ', 34,35) and said tank component (45; 47) gas channel between, and,

-be used for the pneumatic adjusting of control air-flow in the said each several part of this device and said pipeline and controlling elements (10-13,28-31,36,37,52-64), and preferably also comprise

-further handle the parts of the separated gaseous fraction of opening (preferably oxygen rich gas), these parts place said tank component (45; 47) afterwards and preferably include pneumatic compress cell (70) and pressure bottle (80), so that inventory of gas product under high pressure.

6, a kind of gas concentration equipment as claimed in claim 5, it is characterized in that this gas adsorption unit is made up of single jar (34), jar (34) in turn or be in absorption phase, or be in the regeneration stage, elution time of absorption phase oxygen rich gas at 10-30 between second, preferably be about 18 seconds, elution time of regeneration stage nitrogen-rich gas at 15-30 between second, preferably be about 23 seconds, therefore, begin second, to be preferably 52 seconds at 30-60 from absorption phase to the full cycle time that the regeneration stage finishes.

7, a kind of gas concentration unit as claimed in claim 5, it is characterized in that this gas adsorption unit is made up of two jars (34 ' 35), they successively or be in absorption phase, or be in the regeneration stage, elution time of absorption phase oxygen rich gas at 10-30 between second, preferably be about 15 seconds, elution time of regeneration stage oxygen rich gas at 15-30 between second, be preferably 24 seconds, therefore, from a jar internal adsorption stage begin second, be preferably 84 seconds at 50-100 to full cycle time of end in regeneration stage in another jar.

8, a kind ofly it is characterized in that, be used for the feed air as any one described gas concentration unit among the claim 5-7, the pneumatic regulatory element of oxygen rich gas and nitrogen-rich gas comprises several pneumatic diaphragm valves (10-13,28-31,36,37), its feature also is, handles said pneumatic diaphragm valve (10-13,28-31,36,37) controlling elements comprises pneumatic timer (55-58) and Pneumatic impulse valve (53,54,59) at least.

9, a kind of as any one described gas concentration unit among the claim 5-8, it is characterized in that pressure regulator valve (62) will be connected on the one hand to be contained in gas adsorption unit (34; 34 ', 35) and moisture adsorption unit (14,15) on the pressure transmitter in each jar, also to be connected on the other hand on the main shut-off valve (61) of pneumatic control system (52-64), it is characterized in that, said pneumatic control system is integrated in the box of a shared tight seal, make the major part element (52-64) of this Controlling System all be suitable for being contained in the said box, its feature also be if gas adsorption unit or moisture adsorption unitary jar in pressure when surpassing predetermined maximum value, promptly pressure is about 800Kpa or when pressure is about 500Kpa in the jar of gas adsorption unit in moisture adsorption is unitary jar, with said pressure regulator valve (62) in working cycle here.

10, a kind of as any one described gas concentration unit among the claim 5-9, the said compress cell (70) that the pressure maximum that it is characterized in that being used for the oxygen rich gas that will produce is brought up to 70Mpa comprising:

-one first two-stage working cylinder (72) in low pressure area work,

-one second two-stage working cylinder (72) in high pressure area work,

-one tundish (74) that safety relief valve (73) are housed, it is serially connected between the cylinder (71,72) of said alternation successively,

-one air control unit (75),

-one first shut-off valve (76) of handling first working cylinder (71) work,

-one second shut-off valve (77) of handling second working cylinder (72) work.