660 MW超超临界开式循环火电机组冷端综合优化  

Comprehensive Optimization of Cold End of 660 MW Ultra-supercritical Open-cycle Thermal Power Unit

作　　者：张东青 金铁铮 王顺森[2] ZHANG Dong-qing;JIN Tie-zheng;WANG Shun-sen(CHN Energy Economic and Technological Research Institute Co.,Ltd.,Beijing 102211,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国能经济技术研究院有限责任公司,北京102211 [2]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《节能技术》2023年第4期349-355,共7页Energy Conservation Technology

基　　金：国家重点研发计划课题(2017YFB0603904)。

摘　　要：在“双碳”背景下,提高低负荷工况下汽轮机冷端运行的经济性愈发重要。本文以陈家港电厂660 MW机组的冷端系统为研究对象,建立了循环水泵变工况计算模型,实现循泵泵组-凝汽器-汽轮机组的耦合计算。以实际循环水参数和运行负荷为变量,通过建模分析,开展了循环水泵泵组工频与变频运行对比、机组冷端综合优化等研究。结果表明,潮汐对循泵功率的影响不大,但对循环水流量的影响较大,同一天的最大差异接近5 000 t/h;循泵变频的最大节能率超过45%。当环境温度约低于22℃时,可以通过调整循环水流量降低煤耗率;环境温度越低,煤耗率收益越大,平均煤耗率可降低2.8 g/kWh以上。Under the background of carbon neutrality,it is increasingly important to improve the economy of cold end operation of steam turbines under low-load conditions.Taking the cold end system of the 660 MW unit of Chenjiagang Power Plant as the research object,this paper establishes a variable working condition calculation model of circulating water pump to realize the coupling calculation of circulating pump unit-condenser-steam turbine unit.Taking the actual circulating water parameters and operating load as variables,through modeling and analysis,the research on the comparison of power frequency and frequency conversion operation of circulating water pump unit and the comprehensive optimization of cold end of the unit were carried out.The results show that the tide has little effect on the power of the circulating pump,but has a greater effect on the circulating water flow,and the maximum difference on the same day is close to 5000 t/h.The maximum energy saving rate of circulating pump frequency conversion is more than 45%.When the ambient temperature is about 22℃,the coal consumption rate can be reduced by adjusting the circulating water flow;The lower the ambient temperature,the greater the benefit of coal consumption rate,and the average coal consumption rate can be reduced by more than 2.8 g/kWh.

关 键 词：循泵变频 泵组模型 最佳背压 冷端优化 煤耗率 

分 类 号：TK018[动力工程及工程热物理]