A Coordinated Control System for Supercritical Circulating Fluidized Bed Units

Abstract

The invention discloses a coordinated control system of a supercritical circulating fluidized bed unit and belongs to the technical field of automatic control of power stations. According to the technical purpose, the coordinated control system which is capable of accurately controlling the main steam pressure and the load of the supercritical circulating fluidized bed unit is provided. According to the technical scheme, the coordinated control system of the supercritical circulating fluidized bed unit comprises a boiler main controller, a steam turbine main controller, an instruction input module and a coordinated control module. The signal input end of the instruction input module is connected with the signal input end of the coordinated control module, and the signal output end of the coordinated control module is connected with the signal input end of the boiler main controller and the signal input end of the steam turbine main controller. The coordinated control system is suitable for the application field of power generation boilers.

Description

technical field [0001] The invention relates to a coordinated control system of a supercritical circulating fluidized bed unit, which belongs to the technical field of automatic control of power stations. Background technique [0002] In recent years, due to the advantages of high combustion efficiency, low pollution and wide fuel adaptability, supercritical circulating fluidized bed has attracted more and more attention. However, due to the complexity and particularity of supercritical circulating fluidized bed combustion, It makes it very difficult to realize the automatic control of the supercritical circulating fluidized bed unit, which seriously restricts the popularization and application of the supercritical circulating fluidized bed unit. [0003] First of all, the supercritical circulating fluidized bed has a special combustion method, which makes the fuel burn in a fluidized state, coupled with the existence of a large amount of hot bed material, the thermal inerti...

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Problems solved by technology

[0002] In recent years, due to the advantages of high combustion efficiency, low pollution and wide fuel adaptability, supercritical circulating fluidized bed has attracted more and more attention. However, due to the complexity and particularity of supercritical circulating fluidized bed combustion, It makes it very difficult to realize the automatic control of supercritical circulating fluidized bed units, which seriously restricts the popularization and application of supercritical circulating fluidized bed units

[0003] First of all, the supercritical circulating fluidized bed has a special combustion method, which makes the fuel burn in a fluidized state, coupled with the existence of a large amount of hot bed material, the thermal inertia of the system is huge; secondly, the supercritical circulating fluidized bed unit The control system not only needs to meet the needs of the heat load, stabilize the steam pressure, and keep the bed temperature stable within a reasonable range, but also undertakes many tasks such as maintaining a reasonable air-to-coal ratio, ensuring combustion efficiency, and controlling SO2 and NOX emissions. The task is complex; in summary, the supercritical circulating fluidized bed unit is a nonlinear system with large lag, strong coupling, multiple inputs, and multiple outputs, and the interaction between variables is very serious. The traditional PID control scheme is difficult Guarantee the realization of the control index of the supercritical circulating fluidized bed unit

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