Direct energy balance coordinated control system used for large circulating fluid bed unit
A technology of coordinated control system and circulating fluidized bed, which is applied in the direction of control system, fluidized bed combustion equipment, and fuel burned in a molten state, which can solve the problem that the control effect of the coordinated control system of the circulating fluidized bed unit is not ideal, and the bed temperature is the main problem. The steam pressure fluctuates greatly, and the variable load rate of the unit is difficult to meet the assessment indicators. It can solve the problems of low load response rate, ensure safe and stable operation, and solve the effect of large fluctuation of main steam pressure.
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[0019] Combine below Figure 1~Figure 2 And embodiment the present invention is described further.
[0020] Such as Figure 1~Figure 2 As shown, this embodiment includes a boiler main control controller, a fuel main control controller and a steam turbine main control controller; the boiler main control controller adopts a steam drum heat signal with a second order differential and a dynamic and static feedforward signal . The heat signal of the second-order differential can more accurately represent the heat signal of the boiler drum than the heat signal of the first-order differential, which improves the adjustment quality of the main control controller of the boiler to a certain extent.
[0021] The dynamic and static feedforward signals include the static feedforward signal LSff of the unit load command to the boiler fuel, the dynamic feedforward signal LDff of the unit load command to the boiler fuel, the dynamic feedforward signal PDff of the unit pressure to the boiler...
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