CONTROL SYSTEM FOR WATER SUPPLY PUMP IN POWER PLANT

摘要

PURPOSE:To assure control responsible to a required value for a flow rate of water supply by replenishing an insufficient amount of bleeding supply to a water supply pump turbine in rapid reduction of a power generation output in a power plant while continuously changing over said insufficient amount of bleeding supply to main steam pressure having no pressure difference to the bleeding. CONSTITUTION:The captioned system supplies a steam pressure control signal in accordance with a difference between a detection value of the rpm of a water supply pump turbine 12 serving to operate a water supply pump 10 and a set value thereof to a water supply control device. A low pressure governor 46 is controlled by a hydraulic servo 42 via a link mechanism 44 for adjusting steam pressure supplied to the turbine 12 with use of said steam pressure control signal 12. Thereupon, a high pressure steam original valve 67 and a high pressure steam adjusting valve 68 are added to a main steam supply system 52 connected in parallel to a bleeding supply system. Both the valves 67, 68 are controlled to replenish an insufficient amount of low pressure steam of the bleeding supply system 50.