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.
Active Publication Date: 2016-09-07
STATE GRID HEBEI ENERGY TECH SERVICE CO LTD +2
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[0002] In recent years, circulating fluidized bed units have been widely used in the field of power generation due to their high efficiency and environmental protection. The control effect of the coordinated control system of the circulating fluidized bed unit is not ideal, the bed temperature and main steam pressure fluctuate greatly, and the variable load rate of the unit is difficult to meet the assessment indicators
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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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The invention discloses a direct energy balance coordinated control system used for a large circulating fluid bed unit, comprising a boiler master controller, a fuel master controller and a steam turbine master controller, wherein the boiler master controller adopts steam drum heat signals with second-order differentials and dynamic and static feed-forward signals; the dynamic and static feed-forward signals comprise static feed-forward signals LSff of unit load instructions to boiler fuel, dynamic feed-forward signals LDff of the unit load instructions to boiler fuel, dynamic feed-forward signals PDff of unit pressure to boiler fuel, dynamic feed-forward VtDf of a bed temperature change rate to boiler master control and dynamic and static feed-forward of load instructions to primary air quantity; the boiler master controller adopts PID variable parameter control according to different load segments; and the fuel master controller adopts a coal quality corrective control loop. The system has the advantages of improving the coordinated control ability of the circulating fluid bed unit, and solving the problems of great fluctuation of main steam pressure and low speed of load response of the unit under a coordinated control mode.
Description
technical field [0001] The invention relates to a direct energy balance coordinated control system for a large circulating fluidized bed unit, which belongs to the field of coordinated control of a circulating fluidized bed unit. Background technique [0002] In recent years, circulating fluidized bed units have been widely used in the field of power generation due to their high efficiency and environmental protection. The control effect of the coordinated control system of the circulating fluidized bed unit is not ideal, the bed temperature and main steam pressure fluctuate greatly, and the variable load rate of the unit is difficult to meet the assessment indicators. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a direct energy balance coordinated control system for large-scale circulating fluidized bed units that is safe, stable, small in fluctuation and high in response rate. [0004] The technical scheme ...
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IPC IPC(8): F23C10/30F22B35/00
CPCF22B35/00F23C10/30
Inventor 任素龙
Owner STATE GRID HEBEI ENERGY TECH SERVICE CO LTD
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