Suction gas plants . heir heat to the fuel. This distils the volatile substances,which are driven out by the pressure of formation. As a hightemperature and considerable time are required for completedistillation, it is probable that only the lighter hydrocarbons aredriven off, the tarry products being decomposed in the loweipart of the generator. A considerable number of producers have been invented irwhich the air enters at the top and bottom of the fuel, the gat 184 SUCTION GAS PLANTS. outlet being halfway up the generator. Such a producerhas the advantage over the single inverted type in t
Suction gas plants . heir heat to the fuel. This distils the volatile substances,which are driven out by the pressure of formation. As a hightemperature and considerable time are required for completedistillation, it is probable that only the lighter hydrocarbons aredriven off, the tarry products being decomposed in the loweipart of the generator. A considerable number of producers have been invented irwhich the air enters at the top and bottom of the fuel, the gat 184 SUCTION GAS PLANTS. outlet being halfway up the generator. Such a producerhas the advantage over the single inverted type in that thecombustion zone is enlarged, extending from the lower airinlet to the gas outlet. As the distillates would burn nearthe outlet, reduction, however, would probably be producers have been constructed, differing in detail,but in the main similar in design, in which the distillates aredrawn off by suction, burnt in a side chamber, and then forcedupwards to the gas outlet through the hot fuel, where. Fig. 43.—Olschewsky, 1881. they are reduced. The suction is obtained in a variety ofways. In Olschewskys patent of 1881 it is obtained byan air blast injector; Fr. Siemens employs a similar blast,while AVhitfield, Hovine, Brenille, and others use a steam Gentys producer of 1901 the desired eflfect is obtainedby a fan. So far, producers of one chamber only have been dealt with,but there are many producers containing two or more chambers,thus allowing the distillation and destruction of the tarry matterto be entirely separated. In some of these producers the coke APPENDICES. 185 obtained from the distillation of the bituminous fuel is used forA
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