| 摘要 |
PURPOSE:To prevent blocking and abrasion of a line by detecting the quantity of granular powder discharged from each hopper and the flow of gas after separation of granular powder and controlling the mixture ratio to be always suitable in a granular powder collecting device of a large-sized boiler for a power plant. CONSTITUTION:The quantity of dust discharged from each hopper 1-4 is input to a control box 14 by each dust measuring device 10-13. On the other hand, the flow rate of air separated from dust in a cyclone separator 15 is input from a flow meter 19 to the control box. The mixture ratio of gas in a granular powder transport pipeline 5 on the upstream side of the cyclone separator 15 is calculated from the dust discharged quantity and air flow. According to the result of the operation, the control box 14 controls the rotational frequency of a vacuum blower 18 to control the quantity of air to be absorbed, whereby the mixture ratio in the granular powder transport pipeline 5 is suitably retained. Dust separated by the cyclone separator 15 is stored in a dust storing tank 1 and suitably discharged. |
