| 摘要 |
<p>PROBLEM TO BE SOLVED: To control waste of consumption electric power by minimizing an absorption amount to be sprayed more than it is required by a method wherein a specific function changing momently which expresses the number of operating circulation pumps to a boiler load is used, which is made to correspond to a set point of the boiler load to control the number of the operating circulation pumps. SOLUTION: In a desulfurizing controller 29, a first and a second functions expressing an absorption column inlet SO2 concentration and an absorption column inlet exhaust gas amount to respective boiler loads based on the absorption column inlet SO2 concentration 27a and the absorption column exhaust gas amount 28a when the controller is operated, and a third function expressing an SO2 amount to be absorbed to a boiler load obtained from both functions, are successively rewritten. Further, a fifth function expressing the number of operating circulation pumps 3 to the boiler load is rewritten based on the third function, and a fourth function expressing the number of operating circulation pumps 3 to the SO2 amount. Then, the newest fifth function is used, which is made to correspond to a boiler load set point 31 to control the number of operating circulation pumps 3.</p> |
