Failure detection of low pressure regulating valve of feed pump small unit of 600MW unit under high load operation
The pressure difference fitting coefficient of 600MW unit will fluctuate in different degrees under the action of low pressure cylinder gain,which will cause serious interference to the fault detection of low pressure regulating valve of feed pump small unit.Therefore,this paper presents a new study on the fault detection of the low pressure regulating valve of the feed pump unit of 600MW unit under high load operation.The effective specific heat capacity parameter of circulating water is introduced into the mathematical model of 600MW unit,which is transformed into a form centered on the opening of the low-pressure regulating valve,and the corresponding operating parameters are inserted into the mathematical model of 600MW unit,and the degree of fault is judged according to the offset between the output result of the model and the output result of the current model in the theory of the opening of the low-pressure regulating valve.The values of known parameters are selected as validation parameters to determine the specific fault type.In the test results,the design method of this study can realize the effective detection of different types of low pressure regulating valve faults,and the practical application effect is good.
high load operation600MW unitfeed water pump small machinelow pressure regulating valvefault detectioncontrol variable method