上汽-西门子超超临界1000MW汽轮机的优化运行

为了提高上汽-西门子超超临界1 000MW汽轮机的运行性能,进行了汽轮机高、中、低压缸通流效率变化特性试验,并以试验结果分析为基础,针对性地开展了机组运行优化研究.通过汽轮机进汽端不同滑压方式的试验比较,确定了机组滑压优化控制曲线,降低了汽轮机高压调门的节流损失;通过开发基于SIS平台的冷端优化管理系统,指导运行人员按照收益与成本比较排序结果来确定循环水泵等冷端设备的优化运行方式,实现了冷端运行效益的最大化;针对汽轮机第六级抽汽的2根管道存在温度偏差的问题,在管道外壁加装了隔热套,将管内蒸汽温度提高10K以上,消除了管内积水隐患.在试点1 000MW汽轮机上的实际应用结果表明:这些优化改进措施的实施不同程度地提高了机组运行的安全性与经济性.

Optimized Operation of SAIO-Siemens Ultra-supercritical 1 000 MW Steam Turbines

To improve the operation performance of SAIC-Siemens ultra supercritieal 1 000 MW steam tur bines, performance tests were carried out to the HP/IP/LP turbine casing so as to obtain their flow effi ciency, based on which operation optimization was studied for the unit. The throttling loss of high-pres sure control valve was reduced by comparing the sliding pressure operation modes and optimizing the slid ing pressure operation curves at turbine inlet end. The cold end effect was maximized by developing an SIS platform-based cold-end optimization management system to guide operators to determine optimal operation mode of cold-end equipment, like circulating water pump, according to comparing and sorting results of re lated benefit-cost model. To solve the temperature deviation problem existing in two pipes at stage 6, insu lation covers was added to external wall of the pipes to increase the inside steam temperature by 10 K, e liminating the hidden trouble of internal water accumulation. Application results to a 1 000 MW steam tur bine indicate that the implementation of above optimization and improvement measures has to some extent helped to improve the operation safety and economical efficiency of the unit.