1000MW二次再热汽轮机滑压运行优化

Optimization of sliding pressure operation of 1 000 MW double reheat ultra-supercritical unit

上汽-西门子1000 MW超超临界二次再热汽轮机采用全周进汽、滑压运行,为满足AGC一次调频快速负荷响应的要求,超高压调阀通常留有较大的负荷调节余量。机组运行时,超高压调阀节流损失较大,对机组运行经济性影响大,通过研究基于全周进汽汽轮机主汽调阀特性和二次再热汽轮机变工况特性,结合二次再热汽轮机滑压优化理论方法,建立节能模式和经济模式下的汽轮机滑压运行优化模型,寻求实际运行不同背压条件下的最佳主汽压力,形成汽轮机滑压运行优化指导方案。

SAIC Siemens 1000 MW ultra-supercritical double reheat steam turbine adopts full-cycle steam and sliding pressure operation. In order to meet the requirements of AGC primary frequency modulation fast load response, ultra-high pressure control vavle usually leave a large load adjustment margin. When the unit is running, ultra high pressure control valve has large throttle loss, thus exerting a greater impact on the economics of unit operation. Based on the characteristics of the CV of the full-cycle steam turbine and the variable operating conditions of double reheat steam turbine, combined with the theoretical theory of the double reheat steam turbine sliding pressure, the optimization model of the turbine sliding pressure operation under the energy saving mode and the economic mode is established. The purpose is to optimize main steam pressure under different back pressure conditions and form a steam turbine sliding operation optimization guide program