Suction gas plants . of gas betweenscrubber and generator when the engine is shut down. The waterseal thus effectually prevents the gas from blowing back into thefurnace and so reduces the risk of explosion. In case of explosionthe water seal would act something after the fashion of an escapevalve. Pigs. 5 and 7, pp. 11 and 15, show this clearly. The Scrubber.—As its name implies, the scrubber is used forcleaning the gas before it is used in the engine. It consists of acylindrical tower made of sheet or cast iron. It is divided intotwo parts by means of a grate or perforated partition, whichsu
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Suction gas plants . of gas betweenscrubber and generator when the engine is shut down. The waterseal thus effectually prevents the gas from blowing back into thefurnace and so reduces the risk of explosion. In case of explosionthe water seal would act something after the fashion of an escapevalve. Pigs. 5 and 7, pp. 11 and 15, show this clearly. The Scrubber.—As its name implies, the scrubber is used forcleaning the gas before it is used in the engine. It consists of acylindrical tower made of sheet or cast iron. It is divided intotwo parts by means of a grate or perforated partition, whichsupports a deep bed of coke or other porous material. The piecesare from 2| to Z ins. in size. At the top there is a spraying 32 SUCTION GAS PLANTS. arrangement which distributes the water all over the coke, down which it trickles and collects at the bottom of the tower, from which it is drawn off by a syphon into the seal box or waste pipe. The usual practice is to allow the gas to flow into the bottom GsstoEngine. Fig. 13.—Producer Plant showing Water Seal and Levels of Water. of the scrubber and out at the top. Thus the motion of thegas is in the opposite direction to that of the water, so that thedeposit is naturally carried away. It follows, therefore, that thebottom layers of coke become more quickly clogged than theupper layers. An improvement in the present-day scrubberwould be effected if means were provided for removing the bottom DETAILS OF CONSTRUCTION. 33 layers of coke without diBturbing the upper. The coke at thebottom of the scrubber, also, should be larger than at the top, sothat the choking effect would be reduced to a minimum. As regards the dimensions of the scrubber, it has been shownby experience that the diameter of the scrubber should not exceed36 ins., otherwise the flow of gas is not uniform over the crosssection. The depth of coke should be about 5 or 6 ft. to cleansethe gas properly. Many scrubbers are capable of improvement in the water supply.To