Abstract
During the normal operation of an ultra-supercritical 660MW steam turbine generator set in a power plant, the output of the coal mill was insufficient, and the boiler feed water flow gradually decreased. After reducing the power load, the boiler feed water flow continued to decrease to the protection action, and the unit tripped. Through on-site inspection and inspection of the operation curve, it was found that the main steam pressure was high, and the re-circulation valves of the steam-driven feed pump A and B were opened. Cause of the fault was accurate analysis. After optimizing the flow rate of the steam feed pump, the unit was restarted and ran normally.
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