Process and installation for the fractional distillation at a low temperature of solid fuels

摘要

265,435. Meiro, A. May 12, 1926. Coking processes; retorts. - Solid fuel is ground and mixed with a liquid of higher boiling point than that of the products to be obtained, the liquid acting as a vehicle for conveying the fuel through a series of retorts which are heated at increasing temperatures. The ground fuel is charged through a valve 34 into the first of six retorts 1 - - 6 which contain heavy oil, a screw conveyor being provided to pass the mixture from one retort to the next through valves 38 - - 42. Each retort is maintained at a fixed temperature which reaches 400‹ C. in the sixth from which the mixture passes into an inclined vessel 7 which discharges the mass into a rotary separator 22 from which the semi-coke is emptied into a receptacle 23 and the liquid pumped into a tank 28 from which the tanks 25 and 26, supplying the retorts 1 to 6 and the vessel 7, are fed. The volatiles from each retort pass through collecting chambers 21 to dephlegmators 31 to condense the products of fractional distillation, and these products from condensers 32 are collected in receptacles 33. The permanent gases are passed through washers 9 - - 12 to a receiver 14 from which a part is withdrawn to heat the retorts or agitate the mixture therein.