660MW超临界机组汽轮机精益化检修后的性能试验分析  

Performance Test Analysis of 660MW Supercritical Unit Steam Turbine after Lean Maintenance

作　　者：何刚 王伟 李贵波 HE Gang;WANG Wei;LI Gui-bo(Guizhou Xishui Dingtai Energy Development Co.,LTD.,Zunyi 564611,China)

机构地区：[1]贵州省习水鼎泰能源开发有限责任公司,遵义564611

出　　处：《汽轮机技术》2023年第5期397-400,共4页Turbine Technology

摘　　要：贵州某2×660MW超临界机组1号汽轮机投产至今,总体运行良好,但在2017年性能试验考核中,其高、中、低压缸效率分别低于设计值1.24%、1.45%、1.59%;轴封漏汽量高于设计值1.94%;THA工况下,热耗比设计值高69.4 kJ/(kW·h)。针对上述问题,分析了影响1号汽轮机热耗偏差的原因,为了提高机组的经济性,对1号汽轮机进行了结构优化及精益化检修。通过修前、修后3调节阀(VWO)全开、75%THA、50%THA、360MW负荷工况试验,结果表明:1号汽轮机在修后各负荷工况下效率、轴封漏汽量及热耗均得以改善,其中,在3调节阀全开(VWO)工况下,高、中、低压缸效率较修前分别提高0.92%、0.20%、1.64%;轴封漏气量较修前降低0.943%;三缸热耗下降48.77kJ/(kW·h)。The No.1 turbine of a 2×660MW supercritical unit in Guizhou has been put into operation since then,and the overall operation is good,but in the performance test assessment in 2017,its high,medium and low pressure cylinder efficiencies were lower than the design values of 1.24%,1.45%and 1.59%,respectively;the shaft seal vapor leakage was higher than the design value of 1.94%;and the heat consumption was 69.4kJ/(kW·h)higher than the design value under THA operating conditions.In view of the above problems,the reasons affecting the deviation of heat consumption of turbine No.1 are analyzed in the paper.In order to improve the economy of the unit,structural optimization and lean overhaul of No.1 turbine were carried out.Through the tests of 3 regulating valves fully open(VWO),75%THA,50%THA and 360MW load conditions before and after the repair,the results showed that the efficiency,shaft seal leakage and heat consumption of No.1 turbine were improved under all load conditions after the repair,among which,under 3 VWO conditions,the efficiency of high,middle and low pressure cylinders under the 3 VWO condition,the efficiency of high,medium and low pressure cylinders is 0.92%,0.20%and 1.64%higher than before the repair;the shaft seal leakage is 0.943%lower than before the repair;and three-cylinder heat consumption decreased by 48.77kJ/(kW·h).

关 键 词：超临界机组 汽轮机效率 精益化改造 漏气量 热耗率 

分 类 号：TM621[电气工程—电力系统及自动化] TK263[动力工程及工程热物理—动力机械及工程]