Method of Coal-Fired Boiler Fuel Caloricity Correction Based on Weak Steady-State Detection
The self-adaption control of fuel caloricity is one of the key technologies to im-prove the control quality of coordinated control system.The BTU corrector is widely adopted as a primary means of caloricity correction,but it is difficult to achieve accurate and fast cor-rection of fuel calorific value.Therefore,this paper proposes a new fuel calorific correction method based on weak steady-state detection.First,operation parameters of the unit are detected real-time and the adjacent weak steady-state model is dynamically built.Second,the calorific-co-rection control circuit is designed and its outputs are used in the coordinated con-trol system which solves industry challenges in online dynamic correction of fuel calorific val-ue.The application results show that the method of calorific correction based on weak steady-state detection can accurately calculate the value of calorific correction for the current coal quality,shorten the closed-loop regulation process of coordinated control system,and reduce the control deviation of load,main steam pressure and intermediate point temperature,so it can improve the quality of the coordinated control comprehensively.This method has high correction accuracy and realizes dynamic model updates,and it can quickly catch the change of unit calorific value which can be used in coal-fired power generating units with coal blend-ing.
self-adaptioncoordinated control systemcaloricity correctionweak steady-statecoal blending
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