| 摘要 |
PURPOSE:To maintain the optimum fluidized condition in fluidized bed part and perform the stable burning by a method wherein an air quantity control according to a fuel quantity and the air quantity control for maintaining an air tower speed are changed-over correspond to a load. CONSTITUTION:An air flow rate signal is inputted in an air flow rate adjustor 6, the adjusting action is performed by a setting value with a boiler master signal 5. A layer temperature signal is inputted in an air tower speed adjustor 9 after changed to an air tower speed signal. The adjusting action in the air tower speed adjustor 9 is performed under the lowest setting value required for fluidizing. In case that the air quantity is less than the required quantity for burning, an output from the air tower speed adjustor 9 is larger than an output from the air flow rate adjustor 6. Therefore, the output from the air tower speed adjustor 9 is selected with a high signal selector 10, thus, the air tower speed is controlled. Meanwhile, in case that the output from the air flow rate adjustor 6 becomes larger than the output from the air tower speed adjustor 9, the output from the air flow rate adjustor 6 is selected with the high signal selector 10, thus, the air flow rate is controlled. |
