FLEXIBLE COAL-FIRED POWER GENERATION SYSTEM, AND OPERATION METHOD THEREFOR

摘要

Disclosed are a flexible coal-fired power generation system and an operation method therefor. The system comprises a thermodynamic system for a coal-fired generator unit, and a high-temperature heat storage system connected thereto in parallel and containing a cold heat storage medium tank (18), a hot heat storage medium tank (20), a heat storage medium pump (17), a heat storage medium, a feedwater heat exchanger (21), a connection valve, etc. A heat storage medium heater (16) is arranged in a flue of a boiler (1), and the heat storage medium heater (16) is in communication with the cold and hot heat storage medium tanks (18, 20); the flow of a heat storage medium entering the heat storage medium heater (16) is adjusted by means of the heat storage medium pump (17), so that output power of a steam turbine is reduced under a condition of stable combustion of the boiler (1); and the flow and temperature of feedwater entering the heat storage medium and the feedwater heat exchanger (21) are adjusted by means of the opening and closing of one or more of a first-stage, a second-stage and a third-stage high pressure heater inlet adjusting valve (12, 13, 14) and a third-stage high pressure heater outlet adjusting valve (15), so that the system meets the requirement of a high variable load rate of the unit.