1000 MW高效宽负荷率超超临界机组设计点优化研究  

Design Point Optimization of a 1 000 MW High-efficiency Wide-load-range Ultra-supercritical Unit

作　　者：何海宇 范世望 彭泽瑛 HE Haiyu;FAN Shiwang;PENG Zeying(Shanghai Turbine Works Co.,Ltd.,Shanghai 200240,China)

机构地区：[1]上海汽轮机厂有限公司,上海200240

出　　处：《动力工程学报》2018年第10期800-806,共7页Journal of Chinese Society of Power Engineering

基　　金：国家科技支撑计划课题资助项目(2015BAA03B01)

摘　　要：为了提高1 000MW超超临界机组在全负荷的经济性,将机组补汽阀开启点降低至850～950MW,同时在原有回热系统的基础上增设0号高压加热器和高压加热器旁路调节系统。机组负荷较低时,投入0号高压加热器;机组负荷较高时,开启补汽阀和采用高压加热器旁路系统。比较了优化后机组的蒸汽参数和经济性,论证了机组的发电能力,并分析了不同负荷分配率时各方案的综合经济性。结果表明:优化后机组在部分负荷下主蒸汽压力提高,热耗率降低;投入0号高压加热器,可进一步提升部分负荷的经济性;开启补汽阀和高压加热器旁路,可以提升机组出力,满足机组发额定出力和最大出力的要求;负荷分配率对机组综合经济性的影响较大,在选择方案时应考虑该因素。To improve the full load economy of a 1 000 MW ultra-supercritical unit, the opening point of its overload valve was reduced to 850-950 MW. Simultaneously, a No. 0 high-pressure heater and a bypass regulating system for the high-pressure heater were added on the basis of its original regenerative system. The No. 0 high-pressure heater would be put into operation at low load, whereas the overload valve and the high-pressure heater bypass system would be put into use at high load. Moreover, the steam parameters and unit economy were compared before and after optimization, while the generating capacity was demonstrated, and the overall economy of various schemes was compared at different load rates. Results show that the main steam pressure increases and the heat rate reduces under part-load conditions after optimiza- tion of the unit. The economy of unit could be further improved by putting No. 0 high-pressure heater into operation. The generating capacity could be increased by running the overload valve and the high-pressure heater bypass system, thus to satisfy the requirements of rated and maximum power output of unit. The overall economy of unit is greatly influenced by the load rate, which therefore should be considered in the selection of optimization schemes.

关 键 词：超超临界机组 高效 宽负荷 设计点 优化 

分 类 号：TK219[动力工程及工程热物理—动力机械及工程]