Patent GB-836371-A (GB)
Title: Improvements in and relating to regenerative coke ovens
IPC: C10B21/22
Filed: 1957-03-22
Abstract: 836,371. Coke oven regenerators. STILL, K. F., [trading as STILL, C. [Firm of]]. March 22, 1957 [March 26, 1956], No. 9550/57. Class 64(1) [Also in Group XII] In a regeneratively heated coke oven (see Group XII), the regenerator chequerwork comprises bars 17, Figs. 3 and 5 of substantially square cross-section formed with lugs 94 and laid in criss-cross fashion in successive layers on a base grating 16. The lugs 94 have a volume corresponding to that of each two lateral slots 94<SP>1</SP>. The lugs nearest the oven head point upwardly to favour the rising gas flow and those furthest from the oven head point downwardly, the middle bars having the lugs arranged alternately up and down. Reversing valves. A mechanically operated reversing valve system, Fig. 14, compries a main driving shaft 120 having an arm 121 keyed thereto and loose pulley segments 122, 123 connected by counterweight ropes 127 and 128 respectively to sets of rich and lean gas cocks 47 and 52, and a second shaft 124 driven from shaft 120 through gears 131 and 132 giving a 5:8 ratio. Shaft 124 rocks cranks 125, 126 operating air valves 54 and waste gas valves 55 through ropes 129 and 130. The shaft 120 is driven from an electric motor through worm gearing 137, a clutch 140 and pinions 134 and 135, the clutch being operated by a gas deficiency safety device. During one anti-clockwise revolution of shaft 120, trailing arm 121, which has been holding segment 122 against a stop 144, moves away, allowing segment 122 to rotatate until it reaches stop 142. opening righthand cocks 47 or 52. Continued rotation of arm 121 moves segment 123 off a stop 144<SP>1</SP> to stop 144 closing left-hand cocks 47 or 52. During this revolution crank arms first rotate through 45 degrees giving a negligible vertical movement h to ropes 129, 130, then through 90 degrees during which said ropes reverse the positions of valves 54 and 55, and then rotate through a final 45 degrees during which again there is negligible vertical movement of the ropes. If the gas pressure falls dangerously a weight in a gas deficiency safety device, Fig. 15 (not shown), falls, and,. through a traction rope and pawl, releases a counterweighted lever which opens clutch 140, freeing gear wheel 134. Counterweight 145 then rotates segment 122 closing the right-hand cocks 47 or 52. During reversal the regenerator groups previously supplied with lean gas may be automatically purged with waste gases extracted from the waste gas main, Fig. 18 (not shown). The reversing valves may also be controlled by a hydraulic or pneumatic system, Fig. 16, in which pressure fluid from a reservoir 184 is distributed by a control device 186 to cylinders 187 or 188 operating lean or rich gas cocks 47 or 52, and to cylinders 189 or 190 operating the air valves 54 and waste gas valves 55. Counterweights 201 return the spent fluid through three-way valves 200 to a tank 180 from which it is supplied by a motoroperated pump 181 or a foot pump 182 to the pressure reservoir 184. The gas deficiency safety device may also be fitted to this system, and, through traction rope 175, actuates valves 200 to close gas supply cocks 47 or 52.