Cause analysis and Countermeasures of boiler separator outlet overtemperature of Supercritical Unit

Abstract:
The reasons for the shutdown of a supercritical unit are analyzed in view of the overtemperature of the outlet temperature of the boiler separator caused by the hidden dangers of the coordinated control system and the operation of operators. This paper introduces the logical relationship, dimensional setting and logical hidden dangers of fuel master control in unit coordinated control system, In particular, countermeasures are put forward for the hidden dangers of coordination control logic, Added design when the fuel master command is greater than 70%, increase the boiler master command logic; when the fuel master command is less than 10%, reduce the boiler master command logic, When the deviation between the target fuel value and the actual fuel value in the boiler master control is greater than 3%, cut off the coordination control and feedwater automatic control logic, The water supply disturbance caused by excessive deviation of coal quantity is prevented, and the operation measures of the operator for the pulverizing system of the unit are improved. The optimization of coordination control logic and the improvement of operation measures improve the safety performance of the unit, and provide a reference for similar units.