US1989774A - Dedusting apparatus - Google Patents

Description

F 5' N. 1.. SNOW 1,939,774

DEDUSTING APPARATUS Filed June 30, 1930 4 Sheets-Sheet 1 ar/nan 4. new

BY y M ZM ATTORNEYS INVENTOR Feb. 5, 1935.

N. L. SNOW I 1,989,774

DEDUSTING APPARATUS File'd June so, 1930 4 Sheets-Sheet 2 INVEN vR 1 ATTORNEYS k Feb, 5, 1935. N. L. SNOW 1,939,774

. DEDUSTING APPARATUS Filed June 30, 1930 4 Sheets-Sheet 3 w A g INVENTOR mall A. allgw ATTORN EYS Feb. 5, 1935. SNOW 1,989,774

DEDUST ING APPARATUS Fild June 50, 1930 4 Sheets-Sheet 4 INVENTOR Mia 17 174 52414 ATTO RN EY) Patented Feb. 5, 1935 PATENT OFFICE DEDUSTING APPARATUS Norman L. Snow, New Canaan, Conn, assignor to Diamond Power Specialty Corporation, Detroit, Mich, a corporation of Michigan Application June 30, 1930, Serial No. 464,986

10 Claims.

This invention relates to a de-dusting appa ratus and has particular reference to an apparatus for removing dust and the like from a stream of flowing gas; 7

One of the primary objects of this invention is to provide a device of the above mentioned character in which elements having wetted surfaces are provided, these elements being of improved shape and arrangement.

Other objects and advantages of the invention will become more apparent as the following description proceeds, particularly when reference is had to the accompanying drawings, wherein:

Figure 1 is a vertical sectional view through an apparatus constructed in accordance with the teachings of this invention;

Figure-2 is a s'ectionalview taken substantially on the line 22 of Figure 1;

Figure 3 is an enlarged sectional view through a portion of the structure shown in Figure 1; Figure 4 is a sectional View taken substantially on the line li of Figure 3; V

Figure 5 is a view similar to Figure 2 showing a slightly modified form of baffle element for use in the apparatus;

Figure 6 is a view similar to Figure 4 showing a slightly modified form of construction for Wetting the surfaces of the baffle elements shown in Figure 5;

Figures '7 to 14 inclusive are views similar to Figure 2 showing still further forms and arrangements of baflle elements; a

Figure 15 is a View similar to Figure 3 showing a slightly modified form of construction; and

Figure 16 is a sectional view taken substantially on the line 1616 of Figure 15.

The present invention is directed particularly to that type of tie-dusting apparatus in which baff e elements are arranged in the fpath of the gas to" be cleaned. The invention contemplates in particular the provisionof a novel baiiie element which will be relatively thick, radially nonsymmetrical in cross sectional shape, that is having a greater dimension in one direction than in another direction and preferably elongated in the direction of .gas flow to provide an apparatus which will be relatively narrow. By the term ment of these baffle elements in the gas passage in such a manner that the wetted surfaces thereof cooperate to form relatively narrow passages through which the gas must pass, which passages, however, will be of substantially constant cross section so that the gas may flow through the apparatus without any substantial loss of pressure due to turbulence. By the term wetting is meant applying a dust collecting substance to the siu'face.

Referring then particularly to the drawings wherein like reference characters designate corresponding parts throughout all views, the numeral 15 designates a gas passage adapted to receive gas from any source (not shown) and to discharge the same either to the atmosphere or to a point of use. Arranged in the gas passage and intermediate the ends of the same, is a dedusting apparatus designated generally by the reference character 16, the arrangement being such that the gas must pass through the de-dust- 2 ing apparatus before it is discharged from the passage 15. The de-dusting apparatus includes a casing 17 which is preferably provided at its top with a tank 18 for receiving a dust collecting fluid, and at its bottom with a sloping wall 19 and a discharge conduit 20 which may be suitably controlled by a valve (not shown). As illustrated in Figure 2 of the drawings, the casing 17 is preferably elongated and is relatively narrow. Positioned in the casing 17, in the path of the flow of gas through the same, are baflie elements 21. These elements may conveniently be suspended from the lower wall 22 of the tank 18 by U- shaped members 23 and 24, the former being welded or otherwise fixed to the bottom wall of the tank'and the latter being similarly fixed to the tops of the baffle elements, these members being detachably connected to each other by suitable means such as the bolts 25. The baffle elements are thick members of elongated non-symmetrical cross sectional shape and may, as illustrated in Figure 2 of the drawings, be substantially diamond shape in cross section, with the sides of the elements shaped to form the curved surfaces 26.

The elements 21 may be, arranged in rows 27 and 28 transversely of the gas passage with the elements in one row staggered relative to the elements in the next adjacent row so that the curved surfaces of the elements cooperate to form relatively narrow gas passages 29 through which the F gas must pass in its travel through the casing.

The invention contemplates the provision of means for flowing a dust collecting fluid, which may for example be water, over the curved surfaces of the bafile elements and to accomplish 3 and 4 of the drawings, tubes which are mounted in the bottom wall of the tank 18 and which project slightly above the bottom of the tank, to prevent dirt and sediment settling in the tank from clogging these tubes. Associated with these tubes are cup-shaped end members 36, the latter being provided in their upper edges with slots 3'7 which cooperate with similar'slots 38 formed in the lower edges of the tubes, to provide nozzle openings 39 directed toward the sides of the baffle elements. The tubes and their associated end members are preferably so shaped as to conform to the curvature of the adjacent curved surfaces of the baffle elements, as clearly illustrated in Figure 4 of the drawings; so that the fluid flowing through the tubes and out the nozzle openings 39 will be discharged evenly against the curved surfaces of the bafile elements.

. To provide means for flushing the nozzle openings 39 to clean'the same, the members 36 may be carried by stems 40 .slidably mounted in spiders 41 carried by the tubes 35, and these stems may invturn be connected to levers 42 pivotally mounted'as at 43 within the tank. Floats 44 are connected to the free endsof the levers 42 and provide means for swinging the levers 42 about their pivots upon variations in they level of the fluid within the tank. Thus, if the nozzle openings become clogged and the fluid level rises within the tank, the floats44 will be raised and will thus swing the levers 42 about their pivots ,to force the stems 40 downwardly and tothus force the members 36 away from the ends of the tubes. Obviously, this will result in an increase in the size of the nozzle openings which will permit the fluid to rush out these openings to effect a cleaning ofthe same.

The operation of the invention as thus: far

described is as follows. Gas flowing through the passage 15 will enter the front of the casing 17 andwill be directed against the body portions of the baflie elements by suitable plates arranged at the top and the bottomof the casing and adjacent-the ba-file elements. The gas will thus be compelled tocontact intimately with the curved surfaces of the baflie elements and these surfaces will be wetted by the dust collecting fluid discharged from the nozzle openings 39 against the same. The dust laden fluid will be deposited inthe base of the casing 17. and will be directed by the sloping wall 19 to theoutlet 20, the discharge through this outlet being controlled by a suitable valve, not shown- Should the nozzle openings become clogged, the level of the fluid in the tank 18 will-rise, thus effecting an actuation of the stems 40 to move" the members 36 away from the discharge .tubesand thus effect a flushing of..the nozzle openings. The bafile elements being elongated in cross section permit the utilization of a relatively longand narrow casing 17, while the curved surfaces of the baifle elements permit passage of the gas through the casing without creating an unusual degree of turbulence in the gas. 4

In Figure 5 a slightly modified form ofbaflie element is disclosed which may be substituted .for the diamond shaped bafiie element shown in Figure 2. The baflie elements 55 are members I 'struction is shown in which the bafiie elements having substantially oblong cross sectional shapes, certain of the elements having concave exterior surfaces and other of the bafile' elements having convex exterior surfaces. Thus, thebafiie elements 55 are provided with the concave side faces 56 and the concave end faces 57, While the bafiie elements 55f are provided with the convex side faces 58 and the convex end faces 59. The elements may be arranged transversely of the gas passage in rows 60 and 61, each row being 7 made up of alternate elements 55 and 55 Thus, in row 60, the first element at the top is provided with concave exterior surfaces, while the next adjacent element in thei'same; rowfis provided with convex exterior surfaces. The elements in the next transverse row may also be alternately convex and concave with, however, the convex elements in this row in longitudinal alignment with the concave elements in the next adjacent row. Thus, the curved surfaces of each element cooperate with the curved surfaces of the adjacent elements to provide passages 62 of constant cross section throughout the casing 17'. o

For wetting the curved surfaces of thebafiie elements 55, tubular members 65 may be provided, one of these members being arranged between eachpair. of baflle elements inthe' same manner as are the tubular members35. It will be understood that the tubular members 65 are closed at their ends by cup-shaped members simllar to the members 36 and it will be noted that each tubular member 65 is provided with a convex side 66 which is positioned adjacentthe concave surface of one baffle element and that each tubular member is further provided with a concave side 6'7'which is positioned adjacent the conelements in the gas will be removed by the film of fluid flowing down the curved surfaces of the baflle elements and will be collected in the bottom of the casing 1'7.

In Figure 7 a further modified form of bafile element is shown and by reference to this figure,

it will be noted that the bafiie elements '75 are polygonal in cross sectional shape and that each element is provided with two elongated flat sides 76, two convex short sides '77, formingone end, i

and two concave short sides 78 forming the other end. The baffie elements may be arranged in rows '79 and 80 transversely of the casing 17" with the elements in each row staggered relative to the elements in the next adjacent row and with the convex curved ends of all of the elements facing the gas flow. Thus, the convex ends .of the elements in row 80 will be arranged between the concave ends of the elements inrow 79 so that all of the baflle elements will cooperate to form passages 81' .of substantially constant cross sectionalarea through which the gas must flow in its. passage through the casing. It will be noted that the elements 75 are elongated and 7 thus permit the utilization of a relatively long and narrow'de-duster casing and it will be clearly apparent that the surfaces of these baflle'elenients may be wetted in any desired manner as, 'for example, the manner previously described.

In-Figure 8 a further modified form of con- 85 are substantially oval in cross sectional shape.

,As illustrated, these elements are preferably provided with the knife edges 86 and the convexly curved sides 87. The elements may be arranged in rows transversely of'the casing. with the elesides 92.

'ments in each row staggered relative to the elements in the next adjacentrowso that the curved surfaces of the elements cooperate to form passages 88 through which the gas must fiow. It will be understood that these elements may be arranged in the manner illustrated or in any other desired manner within the gas passage and that the curved-surfaces of these elements may be wetted in any desired manner.

In the form of invention shown in Figure 9, bafiie elements 90 are illustrated as being substantially diamond shaped incross section but as having the concave sides 91 and the convex These elements may be arranged in rows transversely of the casing with the elements of each row staggered relative to the elements of the next adjacent row to provide passages 92' through which the gas must flow. As illustrated, these elements are preferably so arranged that their longer cross sectional axes are in the direction of gas fiow and it will be understood that the curved exterior surfaces of these elements may be covered with a film of dust collecting fluid in any desired manner. I

In Figure 10 a construction is shown' in which elements 95 are arranged in rows transversely of the casing with the elements in each row staggered relative to the elements in the next'adjacent row. Each element 95 is substantially pearshaped in cross section, being provided with the convexly rounded end 96 and the substantially concave sides 97 which unite at one end of the element to form the knife edge 98. The elements are so arranged that passages 99 are formed through which the gas must travel. It will be noted that, as illustrated, these elements are elongated in cross sectional shape in the direction of gas flow, and it will be understood that these elements may be arranged in any desired manner within the gas passage.

In Figure 11 a further modified form of construction is disclosed in which the casing 17 is shown as being relatively wide as compared to the gas passage 15 It will be noted that inthis form of construction, however, the casing is relatively short as compared to the casings in the forms previously described. Arranged in the casing 1'7 are bafiie elements which are similar in construction to the baffle elements 21 shown in Figure 2 of the drawings. These elements may be arranged in rows transversely of the casing with the elements in each row staggered relative to the elements in the next adjacent row to provide passages 106 through which the gas must pass in its travel through the casing. While the elements in this form are shown as being'substantially diamond shaped in cross section and as being provided with curved exterior'surfaces it is to be clearly understood that these elements may be of any desired shape and may be formed. either solid, cored out or of flat plates secured together in any desired manner. It will be noted, however, that the elements instead of being arranged with their longer axes in the direction of gas flow are arranged with their longer axes crosswise of the casing, thus facilitating the utilization of a wide casing which, however, will be relatively short as compared to the casings utilized with the forms of baflie elements previously described.

In Figure 12 a construction is shown in which baflie elements 110 are arranged in rows transverse of the casing. The elements in each row are staggered relative to the elements in the next adjacent row to provide passages 111 through the like in the top of the element. 'end of the element is provided with the saw which the -gas"must' pass. The elements 110 are shown asbeing formed with rounded ends Itwillbe understood thatthe elements 110 may be formed in any desired manner and that the surfaces of these elements may be covered in any desired manner by a film of dust collecting fiuid.

In'Figure 13 elements 115 are shown which are similar to the elements 110 in that each element is provided with the fiat sides 116 which are united at the rear of the element to form a knife edge 117. The forward end of each element is, provided with the two curved surfaces 118 which meet at the front of. the element to form a relatively sharp edge 119. These elements may be arranged in rows transversely of the casing as illustrated, with the elements in each row staggered relatively to the elements in the next adjacent row to provide gas passages through which the gas must travel.

In Figure 14 therezis disclosed a construction in which elements similar to the elements "85 are shown as-being arranged diagonally of the casing. It will be noted that the elements are arranged in rows 126 and 127 transversely of the casing andare inclined toward the sides of the casing. Further the elements in row 127 are staggered and disposed angularly relative to the elements in row 126. Thus alternate rows of the elements are oppositely inclined so that interrupted passages 128 are formed within the casing for the passage of the gas. It is to be understood that the curved surfaces of these elements may be wetted in any desired manner to effect a removal of the dust from the gas.

In Figures 15 and 16 a slightly modified form of construction for wetting the surfaces of the baflle elements isdisclosed. Referring to these figures, it willbe noted that there is disclosed a baflle element'130 which may be of any desired cross sectional shape. The baffle element is supported from the lowerwall 22 of the liquid tank 18 by members 23' and 24'. is, however, provided in its upper end with the recess 131 adapted to be supplied with water or other dust collecting 'fiuid 'from the tank 18 by nozzles 132. When the element is cored out or formed of plates fixed together this recess may i be formed by fixing a cup-shaped member or The upper teeth 133 so that when the recess 131 becomes filled with water, this water will flow between the saw teeth 133 and down over the exterior surfaces ofthe bafile element.

To prevent the spaces between the saw teeth from becoming clogged with sediment or the like, a conduit 134 may be located adjacent the top of the baflie element, this conduit being supported from the base of the tank by suitable brackets 135. A fluid under pressure may be supplied to the conduit 134 by a supply pipe 136 and the conduit is provided with nozzles 13'? and 138 for directing this fluid under pressure toward the spaces between the saw teeth and toward the bottom of the recess, respectively. The arrangement is such that whenever the recess 131 or the spaces between the saw teeth become clogged with dirt or the like, a fluid under pressure may be supplied to the conduit 134 and may be discharged from this conduit toward these portions of the baflle element to effect a. cleaning of the same.

The baffle element 7 From the above it will be. noted that the invention provides a de-dusting apparatus in which baffle elements of appreciable; widthare; used. These baffle elementsmayzbeisolid memberaso-lid 1 members, cored out' in themannerillustrated,

members formed of aplurality of plates fixed together, ormembers vformed'in any other desired manner. .Theelements are oblong or elongated in cross sectionalshape and are arranged in the de-duster casingwiththeirlongeraxes either crosswise, lengthwise ,or diagonally of the casing. vThe elements are provided with curved, or curved. and flat Vexterior'isurfaces and are so arranged that these exteriorsurfaces cooperate to form passages through-which the gasv must travel. These surfa'cescf-athe 'elementsare adapted to be covered-by a fiimiof dust collecting fluid so that-the dust carried by the gas passing through. the :casing will be collected by this fluid and discharged from the casing.

'While several formss'of-the invention have been described with considerable detaihitis to be understood. that thedescription is for the purposes of illustrationonly and that the-right is reserved to make such changes in the details of construction and arrangement: of parts'as will fall within the. purview of the attached claims. What I claim asmy-inventionis: 1.In an apparatus for'removingdust fre gases, a-.chambernavfluid tank carried by said chamber, a bafiieelemzent of. appreciablewidth in said chamber; said baflle element=being of elongated cross sectional shape and being provided with curved surfaces, means for continuously flowingv ajfiuidfrom saidetarrk ogver the curved surfaces of said baffie element, and means for flushing saidfluid flowing means.

2. In combination,- a gaspassage, a; pair; of baflie elements in said gas passage, said. baflie elements being. -,provided withadjacent curved surfaces, and ar fluid discharge-nozzle arranged between said bafile elements, fluid discharge nozzle being provided with curved sides conformingto' the curvature of the adjacent surfaces of said bafi-le elements.

sectional shape, certain of {said baiiie elements being provided with convex exterior surfaces and others; of said baflie eiements being provided with concave exterior; surfaces, said basic elements being arranged within said passage with the concave surfaces of the first mentioned elements adjacent to theconvex surfaces of the last men tioned-elements and fluid dischargenozzles arranged between.said baflle elements, each discharge nozzle .beingprovided with concave and convex surfaces respectively adjacent the convex and concavesurfacesof said elements. I 5. Inan apparatus of the classdescribed, a baflie element having a recess in its upper end, means for supplying a fluid to said recess whereby'said recess may be overflowed to wet the surfaces cf said element, and means, for. flushin 'saidrecess cleanse the ,same.

.6-. In an apparatus of the class described, a bafiie element providedwith a recess in its upper end, the upper edge ofsaid element being serratedwhereby a fluid supplied to said recess may flow between the serrations and downwardly over the sides of the element, meansf or supplying a fiuid to said recess, and means for flushing said recess and the -spaces; between the said serrations. i V

7 Incombination, a gas-passage, a plurality .of bafiie elements disposed in said gas passage,

all of the surfaces of certainof said baffle ele- -ments being concave and all of the surfaces of the remaining of saidelem entsb eing convex, said baffle elements being so arranged that the convex surfaces of the first mentioned elements are adjacent the concave surfaces of the second mentionedelements whereby said elements cooperate to form passages of substantially constant cross sectionalarea through, which the g as must flow.

8. In an apparatus of theolass1 described, a bafile element, means forflowing a fluid over the exterior surfaces of saidbaffle element, and means for discharging .a fluid under pressure adjacentsaid flowing means to cleanse the same.

9. In an apparatus: of the class described, a

-baffle' element having a recessfinits upper end,

means for supplying. a fluid to said recess whereby said recess maybe overflowed to wet the surfaces of-sai-d element, andmeans fordischarging a fluid under pressure adjacent said recess to cleanse the same.

I l0. In an apparatus of the class described, a bafile element, means associated with the upper end of said element for flowing a fluid over the surfaces. of said element, and auxiliary fluid supply means; for cleansing said first mentioned meansg NORMAN, ,L. SNOW.

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