Coal dry distillation device

The purpose of the present invention is to enable low-cost acquisition of an inert gas (low-oxygen concentration gas) promoting the release of a dry distillation gas from coal. The invention is provided with: a coal dry distillation device main body (110) utilizing the rotary kiln method; exhaust means (118, 118a to 118c, 130), connected to an outer cylinder (113) of the coal dry distillation device main body (110), for exhausting an exhaust gas present inside the outer cylinder (113); gas extraction means (141, 141a, 141b, 143, 144, 144a) for extracting a portion of the exhaust gas exhausted by the exhaust means; and low-oxygen concentration gas supply means (141, 141a, 141b, 147, 142, 145, 145a, 146) for sending into the inner cylinder (112) the exhaust gas extracted by the gas extraction means so that the oxygen concentration of the exhaust gas is lowered.