集成蒸汽引射器热电联产余热供热系统全工况性能分析  

Performance Analysis of the Cogeneration Waste Heat Heating System Integrated with a Steam Ejector Under Full Conditions

作　　者：张尤俊 戈志华[1] 庞敬帅 徐磊[1] 杨志平[1] 杜小泽[1] ZHANG Youjun;GE Zhihua;PANG Jingshuai;XU Lei;YANG Zhiping;DU Xiaoze(Key Laboratory of Power Station Energy Transfer,Transformation and System,Ministry of Education,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《动力工程学报》2023年第3期380-390,共11页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2020YFB0606202);中央高校基本科研业务费专项资金资助项目(2021MS014)。

摘　　要：为了提高工业余热的利用率,提出了增设蒸汽引射器的新型热电联产余热供热系统,通过抽汽引射部分低温乏汽以提质利用,并将其作为1级中间热源梯级加热热网水。基于蒸汽引射器能量匹配特性,以某350 MW余热供热机组为例,通过变工况计算确定蒸汽引射器的工作性能参数,完成梯级供热系统集成,在此基础上建立热力系统模型,并开展变工况热力学性能和适用性研究。结果表明:与案例系统相比,新型系统在设计供热工况下的乏汽利用率提升了12.15%,机组平均发电热效率提高了4.64%,平均供电煤耗率降低8.50 g/(kW·h),负荷调节灵活性提高,当供热负荷率为80%时,新型系统调峰容量比为27.26%,提高了5.78个百分点。To improve the utilization rate of industrial waste heat,a novel cogeneration waste heat recovery heating system coupled with a steam ejector was proposed.This model allowed part of the low-temperature exhaust steam to be injected into the extraction steam and used as an intermediate heat source to cascade heating water in the heating network.Considering the energy matching characteristics of the steam ejector,taking a 350 MW cogeneration unit as a case,the operation parameters of the ejector were determined through variable calculated working conditions and the cascade heating system integration was completed.Based on this simulation,the thermodynamic system model was established and the research on the thermodynamic performances and applicability of variable working conditions was analyzed.Results show that compared with the case system,the new system has acquired an extra 12.15%of exhaust steam utilization rate under designed heating condition,an increase of 4.64%in the average power generation thermal efficiency,and a reduction of 8.50 g/(kW·h)in the standard coal consumption rate.The flexibility of load regulation is also improved,when the heating load rate reaches 80%,the peak capacity ratio of the new system can be increased to 27.26%,which is 5.78%higher than that of the case system.

关 键 词：热电联产 高背压 蒸汽引射器 余热利用 电热负荷特性 灵活性 

分 类 号：TK115[动力工程及工程热物理—热能工程]