Patent GB-649430-A (GB)
Title: Improvements in or relating to combustion plant
IPC: F23J1/08
Filed: 1948-10-29
Abstract: 649.430. Removing slag from furnaces. BABCOCK & WILCOX, Ltd., and SILK. P. B. Oct. 29, 1948, No. 28171 [Class 51 (i) ] The quenching chamber 4 for the reception of molten slag from a furnace chamber 1 operating under superatmospheric pressure, e.g. 100 lbs. per square inch, has a cold water supply pipe discharging tangentially into an annular channel 12 giving an anti-clockwise swirl to the water, an offtake 9 for surplus water controlled. by an electrode type control 11, and a transfer pipe 13 with a valve 14 arranged to discharge in a clockwise direction into the channel 16 of a disposal chamber 15 from which slag and water are discharged into a sluiceway 21 through a valve 19. The quenching chamber 4 is additionally provided with a valve 6 controlling the introduction of hot gases into the slag passage 3, and the disposal chamber 15 has an air release valve 18. When the valve 14 is opened slag and water are driven into chamber 15 until the pressure therein is equal to that in chamber 4. The valve 14 is then closed and valve 19 is opened after releasing part or all of the compressed air by the valve 18. In a modification the pipe 13 delivers into the top of the disposal chamber which is disposed at a lower level than the quenching chamber and which has a sloping channel in the floor leading to an outlet controlled by a hydraulically operated gate valve towards which outlet is directed a sluicing nozzle disposed over the sluiceway. A further modification shows the automatic control of the water supply valve and of the discharge valve 14 according to the level of water reached in the quenching chamber, the quenching water being cooled by an helical cooling coil supplied with water through a thermostatically controlled valve. In yet another modification, Fig. 5, the floor of chambers 50 and 51 slopes continuously to a discharge point 63 the openings from the respective chambers being under control of the hydraulically operated gate valves 55 and 64. A controlled balance connection 69 is provided between the gas spaces of the two chambers having incorporated with it a bleeder pipe 71 for the supply of hot gases and a pressure relief valve 74, and quenching water is circulated from an offtake 75 by a pump 78 through a cooler 79 to an inlet nozzle 58 any operation losses being made up from the valve 81. A controlled connection 85 between the water spaces of the two chambers in also provided. Slag normally accumulates in the chamber 51 and is discharged into the sluiceway 54 as above by stopping the circulation of the water, closing the gate valve 55 and the balance cock 70 and opening the gate valve 64. Slag may be allowed to collect in the chamber 50, transfer to the chamber 51 being effected by the furnace pressure by appropriate manipulation of the valves. Other modifications show arrangements in which the mixed slag and water are transferred from the quenching chamber to the disposal chamber by a pump. In the first of these the water flow system is similar to that disclosed in Fig. 5 with the transfer pipe forming the outward path between the two chambers, and in the second the slag/water mixture is lifted to a bunker, where the water drains off and is returned to the system, the quenching chamber in this case also containing a cooling coil. If desired, the water in the quenching chambers of the above arrangements may be allowed to boil, the escaping steam being usefully applied. Specification 616,864 is referred to.