| 摘要 |
PURPOSE:To prevent the manual operation in one line from causing disturbance of the other line or the whole coal feeding control by installing an adder and a multiplier-divider. CONSTITUTION:In a control system for the coal feeder of a boiler supplying a common output to two lines of cells with a distribution damper, a measured value Drc for the total coal feeding amount of the coal feeder 3 and a boiler master signal BM are fed to a master controller 17 for coal feeding. Ratio setting devices 18, 19 distribute an operation signal MVo as the output of the controller 17 at the volume ratio of each cell 901, 902. The outputs of each device 19, 18 are fed into a manual/automatic operation device 21 for the distribution damper and a manual/automatic operation device for the coal feeder respectively. An adder 25 adds the outputs a, b of those manual/automatic operation devices to dispatch a command signal MVc for total coal feeding to the feeder 3. A multiplierdivider 23 computes the ratio of the output c of the adder and the output b of the manual/automatic operation device for the distribution damper and dispatches a command signal MVd for the distribution damper to the distribution damper 6. |
