| 摘要 |
PURPOSE:To provide an optimum desulfurizing condition, by a method wherein a drive device, changing the height of the opening of an inflow port, is mounted to a desulfurizing agent discharge cylinder having an inflow port opened to the upper layer of a desulfurizing agent. CONSTITUTION:An extraction cylinder 29, serving as a discharge cylinder, which is slidably engaged and inclined concentrically with an outer cylinder 27, is supported to a bearing 28 which is secured on the outer surface of a water-cooled wall 2, through a packing 30 so that it is movable forward and backward in a diagonally upper and lower direction. When an amount of sulfur in coal, SO2 concentration in waste gas, and the load of boiler are changed, they are detected by means of detectors 41, 42, and 43, respectively, to send a signal. A solenoid 35 is actuated through a computer 40 and a regulator 39, a piston rod 33 of an air cylinder 32 and the extraction cylinder 29 are integrally moved backward and forward to change the level of an inflow port 29a. In this case, the more a sulfur content in coal is increased, the more the height of the inflow port 29a is increased. Further, the more SO2 concentration in exhaust gas and a boiler load are increased, the height of the inflow port is increased.
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