US2127645A - Gas washer - Google Patents

Description

Aug. 23, 1938. s. l.- KIN'NEY ET AL GAS WASHER Filed June lO, 1937 A 2 Sheets-Sheet l [faz/gara,

2 Sheets-Sheet 2 Aug. 23, 1938. s. P. KINNEY ET lAl.

GAS WASHER Filed June l0, 1937 HNNNHWINIII- Patented Aug. 23, 1938 UNITED STATES GAS WASHER Selwyne P. Kinney, Pittsburgh, Pa., and Charles E. Dougan, Chicago, Ill., assignors to H. A. Brassert & Company, Chicago, Ill., a corporation of Illinois Application June 10, 1937,l Serial No. 147,428

2 Claims.

This invention relates to a new and improved gas washer and more particularly to apparatus of this type especially adapted for the final cleaning and drying of gases, as for example, blast furnace gas, after the gas has had preliminary cleaning treatment in the usual stationary spray towers or in other cleaning apparatus such .as disintegrators.

Many forms of gas cleaning vapparatus have been developed, including simple spray towers and towers partly filled with banks of hurdles or of tile to secure better contact with the gas and greater elimination of dust. The most elcient of the usual forms of apparatus ordinarily reduces the dust to approximately one-fourth of a grain per cubic foot. These forms of apparatus do not, however, reduce the moisture content of the gas to any amount approaching normal saturation.

It is an object of the present invention to provide .a new and improved gas washer.

It is a further object to provide apparatus of this character which is particularly efficient in the removal of moisture from the gas.

It is also an object to provide apparatus of this character using a bed of coke for cleaning and moisture eliminating purposes.

It is an additional object to provide apparatus having a reverse flow of gases making a double pass through the cleaning means for the purpose of cleaning and of moisture elimination.

It is a further object to provide apparatus in which the cleaning means may be rapidly and easily removed and replaced.

Other and further objects will appear as the description proceeds.

We have shown a preferred embodiment of our invention in the accompanying drawings, in which- Figure l is a vertical section of the apparatus; and

Figure 2 is a plan View of the apparatus.

The apparatus comprises a chamber II which is enclosed by a circular shell I2 and enclosed at the bottom by a conical shell I3. The top wall I4 of the shell is provided with an inlet passage I5 and an outlet passage I6. A drain pipe I1 leads from the lowest portion of the sump in the conical bottom I3, .and extends to the sealing fitting I8 discharging into pipe I9. The pipe 20, controlled by valve 2|, is provided for the introduction of fluid under pressure to blow sediment which may collect, past the seal I8.

The upper portion of the chamber I I is divided into two sections by a multiple dividing wall 22,

23, which forms a coke receiving chamber 24 closed at the top by a removable cover Z5. The chamber 24 is provided with division walls 26, as shown in Figure 2, so that .alternate sections discharge in opposite directions at their lower 'f ends. The section shown in Figure l discharges to the right between the perforated sloping walls 21 and 28, which define a space 29 for receiving cleaning material. The wall 28 is supportedby the cross beams 30, and the upper wall 21 is se cured to the cross beams 3|. It should be noted that the solid division wall 23 continues down to meet the upper edge of the perforated wall 28.

The similar perforated walls 32 and 33 supported by beams 34 and 35, respectively, fo-rm a space 36 on the opposite side of the main chamber to the space 29, to receive cleaning material. The clean-out passages 31 and 38 are provided at the lower ends of the spaces 29 and 36, these openings being closed by covers 39 and 40.

A series of spray rnozzles 4I are located above the perforated wall 32 on the incoming side of the chamber, these nozzles being fed from the pipe 42 controlled by valve 43. The outlet side of the chamber is provided with the spray nozzles 44, fed from the pipe 45 controlled by valve 46. The third series of spray nozzles 41 is provided below the wall 28 and these nozzles are directed upwardly in order. to spray the under side of the material in the space 29.

The walls 21, 28, 32 and 33 may be formed of heavy Wire mesh or of perforated sheet metal, the openings being such as to permit ready flo-w of gases and fluids without permitting the loose cleaning material to fall through. The cleaning material, which may be coke, broken pieces of ceramic material or similar material providing large contact areas, is introduced by removing the cover plate 25 and permitting the material to fall by gravity into the chambers 24. From these chambers 24 the material flows both to the right and left, as seen in Figure 1, and by gravity fills-up the spaces 29 and 36.

The spray nozzles 4I are normally continuously in-operation, wetting down the material in the space 36. The gas to be cleaned enters downwardly through the passage I5 and passes through the material in the space 36 into the lower portion of the cleaning apparatus. As it passes through this material, such as coke, in space 36, it

leaves in the bed of material a considerable amount of the dust and moisture which it contains. The gas then makes a reverse bend and ows upwardly through the material in the space 29. This sharp turn has the additional tendency to throw out particles of dust and globules of water, which fall downl into the sump in the bottom of the chamber. The gas passes upwardly through the material in the space 29, which serves to remove additional dust and also toI remove a very large proportion of the water or moisture remaining in the gas.

The material in the space 29 gradually becomes clogged by the deposit of dirt and moisture and is intermittently sprayed by means of the nozzles 4d and 41 to clean the material. When the material in either side of the chamber has become so clogged as to impair its efliciency, it may readily be removed by taking ci the covers- 39 or 40, when the material will flow out by gravity and new material will be allowed to flow in by gravity through chute 24.

The circular cross-sectional shape of the chamber aids in causing the material to flow easily to the discharge passages 3l and 38. The apparatus is so designed that the gas cannot by-pass the lower portion of the central partition but must pass completely through both beds of coke or other cleaning material. This material is cheap and may be removed and replaced with low labor cost so that the apparatus may be kept in eicient 'operating condition. It will be understood that thecleaning beds may be of varying thicknesses and have different types and sizes of cleaning material, depending upon the conditions to be met. Y

While we have shown one preferred embodiment of our invention, it is capable of change and modification to meet Varying conditions and requirements and we contemplate such changes as come within the spirit and scope of the appended claims.

We claim:

1. In a gas washer, a closed vertical chamber, an intermediate portion of the chamber being interrupted by a bed of coke extending across the chamber, partitioning means dividing the chamber above the lower surface of the coke bed into inlet and outlet chambers, the coke beds inclining downwardly away from the partitioning means, the partitioning means being divided to permit the introduction of coke from the upper portion of the chamber through the partitioning means to both sides of said means, and means for introducing gas into the inlet chamber and for withdrawing gas from the outlet chamber.

2. In a gas washer, a closed vertical chamber, an intermediate portion of the chamber being interrupted by a bed of coke extending across the chamber, partitioning means dividing the chamber above the lower surface of the coke bed into inlet andoutlet chambers, the coke beds inclining downwardly away from the partitioning means, the partitioning means being divided to permit the introduction of coke from the upper portion of the chamber through the partitioning means to both sides of said means, means at the periphery of the coke beds for removing coke therefrom by gravity, and means for introducing gas into the inlet chamber and for withdrawing gas from the outlet chamber.

SELYNE P. KINNEY. 'CHARLES E. DOUGAN.

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