GB219692A - Retort setting for the continuous distillation of lignite, peat, schist, sawdust and the like substances - Google Patents

Abstract

219,692. Pieters, J. July 23, 1923, [Convention date]. Retort furnaces; charging and discharging.-Retorts for the distillation of materials such as lignite, peat, or sawdust having a high moisture content are disposed in series in two directions at right angles to each other in a single block of masonry and are separated by longitudinal walls pierced by channels for heating gases and for escape of the distillation products, the materials being dried before reaching the hot zone by waste heating gases. The oval retorts a have between them flues b with passages b<1> for the escape of the distillation gases which pass to a main h. The material is charged into a hopper c serving all the retorts a, the depth of the material being sufficient to prevent escape of gases from the retort through the hopper. The material is dried by the hot burnt gases which pass from a passage d through bramches d<1>, d<2> to ducts e<2> at the base of the drier, these ducts being covered by funnels e<3> for filling the vertical chambers a<1>. The distillation gases after purification in the by-product recovery plant are burned in burners i and combustion spaces l, the hot gases circulating in channels m, n before escaping by passage d. The temperature in zone A is 400-500‹ C. and in zone B a higher temperature is attained. The coke is cooled by superheated steam injected through channels o<1>, water gas being generated and the material is further cooled by steam circulating in passages o. Coke is discharged by rollers p into containers r having screw feeders s leading to transporters t common to the battery of retorts.