| 摘要 |
PURPOSE:To prevent the erroneous control due to noise by comparing the variations in the liq. level in a head tank with the variations in the flow rate of the supply liq., and regulating the opening of a flow control valve when both signals fluctuate simultaneously and violently. CONSTITUTION:The head tank 3 is provided above the centrifugal thin film dryer 1, and waste liq. 4 is supplied into the dryer 1 by the water head due to the level 3a in the head tank 3. A supply liq. tank 6 is connected to the tank 3 through a pipeline 5, and the flow control valve 8 is furnished to the pipeline 5. A liq. supply rate detector 10 and a head tank level detector 101 are provided to the system, the flow control valve 8 is actuated by the signal of the flow controller 11 only when both signals fluctuate simultaneously and violently, and feedback control is carried out. By this method, noise components are removed, and stable operation can be carried out. |
