热电联产机组耦合吸收式热泵运行特性的研究  

Research on Operating Characteristics of Coupled Absorption Heat Pump for Cogeneration Units

作　　者：李蔚[1] 杨存辉 吴国林 王海鸿 梅传颂 赵永良 盛德仁[1] LI Wei;YANG Cunhui;WU Guolin;VWANG Haihong;MEI Chuansong;ZHAO Yongliang;SHENG Deren(College of Energy Engineering,Zhejiang University,Hangzhou 310027,China;Beijing District Heating Group Co.,Ltd.,Beijing 100028,China;Beijing Jingneng Energy Technology Research Co.,Ltd.,Beijing100089,China)

机构地区：[1]浙江大学能源工程学院,杭州310027 [2]北京热力集团有限责任公司,北京100028 [3]北京京能能源技术研究有限责任公司,北京100089

出　　处：《动力工程学报》2023年第7期951-958,共8页Journal of Chinese Society of Power Engineering

摘　　要：为提升耦合吸收式热泵热电联产机组的经济性,基于Ebsilon搭建机组热力模型,采用控制变量法,分析热泵内外部参数对热泵效率和机组热经济性的影响,结合某2×350 MW热电联产机组实际运行数据进行研究。结果表明:在额定采暖工况下,耦合吸收式热泵比只采用热网加热器可节省约18%的抽汽量,机组热效率提高1.2%;热网回水温度升高10 K,热泵性能系数COP下降约0.1%,机组的热经济性下降约4%,可通过提高热泵供热负荷,减小机组热经济性下降的幅度;提高低温循环水温度,热泵COP和机组热经济性均增大,当热网回水温度与其差异小于10 K时,供热性能提高效果不明显;热泵发生器出口蒸汽温度升高10 K,热泵COP增大18.9%,机组供热耗汽量增加约1%;通过调整热泵运行参数,可提取更多循环冷却水余热,降低热网加热器出力,减少机组的冷端损失。Aiming at improving the economy of cogeneration unit coupled absorption heat pump,the thermal model of the unit was built based on Ebsilon;the influence of internal and external parameters on the heat pump efficiency and thermal economy was analyzed using the control variates method;the research was conducted combined with the actual operation data of a 2 × 350 MW cogeneration unit.Results show that under the rated heating condition,the extraction steam of the coupled absorption heat pump can be saved by about 18%and the thermal efficiency of the unit can be increased by 1.2%compared with that of the heating network heater only;The return water temperature of the heat supply network increases by 1o K,resulting in that the performance coefficient(Cop)of the heat pump decreases by about O.1% and the thermal economy of the unit decreases by about 4%.The reduction of the thermal economy of the unit can be reduced by increasing the heat supply load of the heat pump;Increasing the temperature of the low-temperature circulating water increases both the Cop of the heat pump and the thermal economy of the unit.When the difference between the return water temperature of the heat supply network and the temperature of the low-temperature circulating water is less than 1o K,the effect of improving the heating performance is not obvious;When the outlet steam temperature of the heat pump generator increases by lo K,the Cop of the heat pump increases by 18.9%,but the steam consumption of the unit increases by about 1%.Therefore,by adjusting the operating parameters of the heat pump,more waste heat of circulating cooling water can be extracted,the output of the heating network heater can be reduced,and the cold end loss of theunit is reduced.

关 键 词：热电联产 吸收式热泵 余热利用 热经济性 

分 类 号：TM621[电气工程—电力系统及自动化]