基于零号高压加热器的深度调峰控制策略研究

Research on Deep Peak Regulation Control Strategy based on No.0 High Pressure Heater

为提高燃煤火电机组深度调峰脱硝装置投运率、满足电网快速调峰和调频需求,以及提升机组低负荷运行经济性,设计基于零号高压加热器的宽负荷脱硝、深度调峰和调频等控制策略,针对某660 MW机组加以实施和试验验证。试验结果表明:基于零号高压加热器的深度调峰控制功能,利用机组高压回热系统蓄能参与负荷控制,机组深调期间能够满足1%Pe/min的AGC变负荷和电网频差0.083 Hz内的一次调频响应需求;在机组深度调峰期间可增开汽轮机进汽调阀,减少节流损失,全开工况下可降低发电煤耗超过1.6 g/(kW·h);协同深度调峰期间机组快速负荷响应和脱硝烟温控制需求,能够维持脱硝入口烟温超过安全限值,实现脱硝系统安全稳定投运。

In order to increase the commissioning rate of denitration devices of coal-fired thermal power plant during deep peak regulation, meet the needs of rapid peak regulation and frequency modulation of the power grid, and increase economic efficiency of low-load operation of units, the control strategies of wide-load denitrification, deep peak regulation and frequency modulation based on No.0 high pressure heater were designed. Aiming at a 660 MW unit, the deep peak regulation was carried out and verified experimentally. The test results show that applying deep peak regulation control technology based on No.0 high pressure heater and implementing a load control strategy with the energy storage of high-pressure regenerative system, the unit can meet the AGC variable load of 1% Pe/min and the primary frequency modulation response demand within the grid frequency difference of 0.083 Hz.During deep peak regulation of units, the steam turbine admission valve can be kept fully open, reducing the throttling loss and reducing the coal consumption of power generation by more than 1.6 g/(kW·h). In coordination with fast load response and denitration flue gas temperature control requirements, the denitration inlet flue gas temperature can be maintained to exceed safety limit, realizing the safe and stable operation of denitration system.