Patent GB-203444-A (GB)
Title: Improvements in coking and carbonizing processes and apparatus more particularly for low-temperature carbonization
IPC: C10B49/16
Filed: 1922-06-28
Abstract: 203,444. Koppers, H. June 28, 1922. Addition to 184,144, [Class 55 (i), Coking &c.]. Heating systems and apparatus.-In the apparatus described in the parent Specification the closed revolving tubular retort is replaced by an open-ended drum 26 adapted to revolve in a closed chamber 80, the chamber 80 being surmounted by and preferably combined in one compact structural unit with the ball-heating furnace 24 and a pre-heating drum 20. The drum 20 is charged with green fuel and with balls which have already passed through the distilling drum 26, the drum 26 being fed with the preheated fuel from the drum 20 and with the heated balls direct from the furnace. The drums are each provided internally with a screw thread which compels the fuel to travel from the inlet to outlet end of the drums, the outlet ends having a grid extension 25, and bars 86 which assist in mixing the balls with the charge and in breaking down any incrustation. The balls from the furnace 24 pass through a regulating device 35 to the drum 26 and meet the pre-heated fuel fed to the drum by a screw conveyer 22, the whole travelling through the drum to the grid 25 where the coke falls through into a hopper and the balls continue to run forward into a channel 62. From this channel the balls are conveyed in an elevator to the fuel-charging hopper 29, passing through a regulating screw conveyer 27, where they mix with fresh fuel and pass through the pre-heating drum 20 to the outlet grid which allows the coal to fall down a shoot 21 to the screw conveyer 22, the balls continuing to a shoot 46, channel 23, vertical slot 36 and a regulating device 34 to the heating furnace. The regulating device 34 comprises a slide 37, situated at the bottom of the slot 36, reciprocated by a crank 40 and so arranged that when the slide moves to the right the balls in the slot will descend a distance equal to about the diameter of one ball, and upon reversal of motion the bottom row of balls will be pushed into the furnace. To ensure that the regulating device is charged uniformly with balls, a second distributing device comprising a flat bar 44 reciprocated by crank gear is provided. The regulating device 35 comprises a reciprocating slide 48 provided with fork-like projections operated by a crank 50 and arranged to deliver the bottom row of balls on to a reciprocating cross slide 51 provided with an opening which allows the balls to fall down an inclined plane and through an opening 58 to the drum 26. The furnace is provided with openings 32, 33 for the heating gases and products of combustion respectively, and, if desired, the furnace may embrace a part of the channel 23 in which case a further regulating device comprising a slide 71, Fig. 13, raised and lowered by a crank 75, is provided which transfers the balls from the regulator 44 and inclined plane 78 to the inlet opening 31 of the furnace. Additional heating of the drum 26, either external or internal, may be resorted to for the prevention of radiation losses &c.