600 MW超临界汽轮机中低负荷配汽优化研究

Study on Steam Distribution Optimization of a 600 MW Supercritical Steam Turbine at Medium and Low Load

以某600 MW超临界汽轮机为研究对象,分析了复合调节存在的节能潜力,通过试验确定各高压调门的流量特性,分析了高压调门不同阀序运行方式下的能耗特性及重叠度设定方法,并对高压调门开启顺序进行了优化。结果表明:优化后汽轮机中低负荷点500 MW、400 MW和330 MW工况下高压缸效率分别提升了1.53%、1.34%和1.42%,热耗率分别降低26.0 kJ/(kW·h)、23.2 kJ/(kW·h)和25.3 kJ/(kW·h)。

Taking the 600 MW supercritical steam turbine as an object of study,a theoretical analysis was conducted on the energy saving potential of the composite regulation mode,while experimental tests were performed to determine the flow characteristics,analyze the energy consumption characteristics and to set the overlap degree of various high-pressure control valves under different sequences of operation,following which,the sequence of valve opening was optimized.Results show that after optimization,the high-pressure cylinder efficiency could be increased by 1.53%,1.34%and 1.42%,and the corresponding heat consumption rate could be reduced by 26.0 kJ/(kW·h),23.2 kJ/(kW·h),and 25.3 kJ/(kW·h),respectively at the medium/low loads of 500 MW,400 MW and 330 MW.