Suction gas plants . y small bulk, resulting in a considerable economy inthe gas production. The quantity of tar in bituminous coal frequently amountsto 4 or 5 per cent., and may even be as high as 15 per cent, of thecoal. The producer gas made from such a coal must be purified 1 See Mngineering, Jan. 31 and Feb. 7, 1905, from which the illustrationsof this section have been reproduced, by the permission of the Editor. 180 APPENDICES. 181 of this tar before use in the internal combustion engine. Thedestruction of the tar can be effected in two ways. The firstmethod consists of the complete com
Suction gas plants . y small bulk, resulting in a considerable economy inthe gas production. The quantity of tar in bituminous coal frequently amountsto 4 or 5 per cent., and may even be as high as 15 per cent, of thecoal. The producer gas made from such a coal must be purified 1 See Mngineering, Jan. 31 and Feb. 7, 1905, from which the illustrationsof this section have been reproduced, by the permission of the Editor. 180 APPENDICES. 181 of this tar before use in the internal combustion engine. Thedestruction of the tar can be effected in two ways. The firstmethod consists of the complete combustion of the tar in thepresence of air, the resulting carbon dioxide and water vapourbeing reduced by passing them over red-hot coke. This method,it is true, completely destroys the tar, but it is not efficient inother respects, since the volatile gases of the coal are burnt withthe tar. The second method, although not so complete in its destructionof the tar, preserves these volatile gases, and consequently yields. Fig. 39.—Iiiitsch, 1882. a richer producer gas. It consists of the decomposition of thetar at a high temperature. The tarry vapours are split up into,first, such gases as marsh gas, ethylene, etc., carbon monoxide andhydrogen; and secondly, into heavy hydrocarbons and carbon,the hydrocarbons being burnt with the tar, and the carbon beingdeposited on the coke. A large number of producers have beenconstructed, which more or less efWciently bear out the above con-siderations, but, owing to limited space, it will be only possible todescribe very generally a few of the more recent. Perhaps the simplest type of producer is that known as theinverted combustion type. Here, contrary to the usual custom. 182 SUCTION GAS PLANTS. the air passes down through the fresh fuel to the zone of
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