GB191304486A - Process for the Distillation of Fuels. - Google Patents

Abstract

4486. Timm, F. C. W. Feb. 27, 1912, [Convention date]. Void. [Published under Section 91 of the Act.] Carbonizing processes and apparatus.-Fuels, such as slack coal, friable lignite, fines of peat, peat fibre, or sawdust, are distilled by the downward passage therethrough of hot gases or vapours. The fuel may be mixed with fragmentary coke, or such coke may be arranged in horizontal layers in the charge. The apparatus illustrated comprises a chamber A supported on trunnions B<1> B<2> and containing a grate D; the heating - medium is supplied through a pipe F, and the gases and vapours leave the chamber through a pipe G. In a modified apparatus, the material is supported on a movable endless grate which carries the material through separate chambers in which distillation and cooling takes place, or the grate may be stationary and the inlet and outlet pipes for the gases movable. Liquids such as water, tar, and other like products, collect beneath the grate at different times and may be withdrawn separately; or the tar may be used for increasing the yield of coke by reversing the current of hot gases at the proper time, thus preventing the passage of the tar through the grate. The distillation may be accomplished in stages by successively using gases at different temperatures, for example the gas or vapour used may be at 100-200‹ C. for the drying stage, at 400‹ C. for the second stage, and at 900‹ C. for the third stage. The heating-medium may be producer-gas, superheated steam, benzol vapour, or the gases produced by burning the tar produced in the process, and warm air or flue gas may be employed for the drying. The medium may be heated in regenerators, and the final increase in temperature obtained by the addition of air, or it may be heated by passage through the hot residue of a previous charge with the subsequent addition of a small quantity of air or of gas heated in separately - fired apparatus.