. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. ues. Exhausting and Scrubbing the Gas.—As the gas leaves the oven, itpasses through the collector pipe (or hydraulic main) where it is eithershowered with water and weak ammonia liquor, or the pipe may be Coke Ovens and Their Relation to Fuel Supply, E. B. Elliott 287 flushed with tar circulation, to prevent stoppages. The former methodthrows down considerable tar and ammonia, these being separated by de-cantation. After leaving the collector pipe, the gas is drawn through acooler where it is again spra
. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. ues. Exhausting and Scrubbing the Gas.—As the gas leaves the oven, itpasses through the collector pipe (or hydraulic main) where it is eithershowered with water and weak ammonia liquor, or the pipe may be Coke Ovens and Their Relation to Fuel Supply, E. B. Elliott 287 flushed with tar circulation, to prevent stoppages. The former methodthrows down considerable tar and ammonia, these being separated by de-cantation. After leaving the collector pipe, the gas is drawn through acooler where it is again sprayed with weak liquor and more tar andammonia are removed. The gas is drawn through this cooler by an ex-hauster of either the positive or centrifugal type. This exhauster assistsin the removal of the tar from the gas. The suction on the exhausteris usually about 4 to 8 in. water gage and the discharge pressure is seldommore than 3^ lb., depending upon the scrubbing equipment and the fric-tion in the pipe lines. The temperature of the gas at the exhausterranges from 25 to 50 deg. FIG. 5. BLOWING ENGINES FOR BY-PRODUCT COKE PLANT The exhauster forces the gas through an ammonia scrubber of thecounter-current type. Here the last of the ammonia is taken out and thegas then passes through a benzol scrubber where it is sprayed with anabsorbing oil instead of water or weak liquor. It is then ready for com-mercial distribution without further treatment, except when it is to beused for domestic purposes, in which case it is purified from sulphur inpurifiers of the type common in other gas manufacturing plants. Ammonia liquor and tar, recovered from the circulation systems men-tioned, are collected into large decanters and separated by their specificgravities. The moisture in the tar is driven ofif by heat and the tar isthen ready for shipment to the refiner. The ammonia is driven off from the weak liquor (containing 1^ to2 per cent of ammonia) by heat in the still. The fixed amm
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