变工况试验下热电联产汽轮机内效率分析研究  

Research and Analysis on the Internal Efficiency of CHP Steam Turbine Under Variable Test Conditions

作　　者：冯垚飞 冯林魁 谷志德 赵凯 王平 Feng Yaofei;Feng Linkui;Gu Zhide;Zhao Kai;Wang Ping(State Grid Gansu Electric Power Research Institute,Lanzhou 730070,China;Lanzhou Longneng Electric Power Science&Technology Co.,Ltd.,Lanzhou 730050,China)

机构地区：[1]国网甘肃省电力公司电力科学研究院,兰州730070 [2]兰州陇能电力科技有限公司,兰州730050

出　　处：《发电设备》2023年第3期141-146,158,共7页Power Equipment

摘　　要：通过变工况试验和等熵平衡法,研究热电联产汽轮机在不同电负荷、不同抽汽流量下汽轮机内效率、缸内效率的变化规律,并且根据等效焓降法模拟计算不同抽汽位置汽轮机内效率的变化趋势。以重热理论为基础,结合汽轮机内效率与缸内效率之间的关系计算低压缸内效率。计算结果表明:在变参数试验工况下,随着抽汽流量、电负荷的增加,汽轮机内效率和高、低压缸内效率均呈上升的趋势,而中压缸内效率呈下降的趋势。在汽轮机各项损失中,冷源损失占比最大,做功损失占比次之。随着抽汽流量的增加,低压缸做功比例减少,高、中压缸做功比例增加。Through the variable-condition tests and the isentropic equilibrium method,the change of the internal efficiency of steam turbine and the internal efficiency of each steam cylinder was researched under different power loads and different extraction steam flow rates for combined heat and power(CHP)steam turbine,while a simulation calculation was conducted on the trend of the internal efficiency of steam turbine under different extraction positions according to the equivalent enthalpy method.Based on the reheat theory,the low pressure cylinder efficiency was calculated from the combination of the equivalent relationship between the internal efficiency of steam turbine and the internal efficiency of each steam cylinder.Calculation results show that,under the variable test conditions with different parameters,with the increase of the power load and the extraction steam flow rate,the internal efficiencies of the steam turbine,the high pressure cylinder and the low pressure cylinder all show a trend of increasing,while the internal efficiency of the medium pressure cylinder shows a trend of decreasing.Among the losses of the steam turbine,the proportion of the cold source loss is major,and the proportion of the work loss is secondary.With the increase of the extraction steam flow rate,the output power proportion of the low pressure cylinder decreases,while the output power proportions of the high and medium pressure cylinder increase.

关 键 词：汽轮机 热电联产 等熵平衡 内效率 汽轮机损失 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]