摘要
热电联产机组利用部分做功后蒸汽作为二次产品进行供暖或工业供汽,是一种深度节能减排的重要方式;但同时也面临着供汽流程与原发电流程如何匹配、电厂深度调峰时如何保证供汽稳定等问题。因此以某660 MW、带200 t/h、6.2 MPa、490℃大流量高参数供汽的燃煤发电机组为案例,对常规的主蒸汽减温减压、主蒸汽带背压机供汽、补汽阀耦合蒸汽引射器这3种供汽方案进行模拟计算和比较,根据所得收益选出最优方案。结果表明:补汽阀耦合蒸汽引射器方案及主蒸汽带背压机方案较常规方案都有一定节能效果,分别可使折合发电煤耗降低2.5~3.6 g/(kW·h)、1.4~3.0g/(kW·h),热电联产效率提升0.12%~0.42%、0.05%~0.24%,获得年节煤收益417.3万元和319.3万元,年化净收益357.3万元和169.3万元;主蒸汽带背压机方案因初始投资较高,回收期高达29.5 a,补汽阀耦合蒸汽引射器方案经济性较好,回收期仅需5.6 a,解决了常规供汽系统面对大流量、高参数供汽需求时能耗过高,损失过大的问题,实现了蒸汽能量的梯级利用,显著提高了系统的经济性。
Combined heat and power units use part of the steam after work as a secondary product for heating or industrial steam supply,which is an important way of deep energy conservation and emission reduction.However,at the same time,it is also faced with problems such as how to match the steam supply process with the original power generation process,and how to ensure the stability of steam supply during the deep peak regulation of power plants.Therefore,taking a 660 MW,200 t/h,6.2 MPa,490℃high-flow and high-parameter steam supply coal-fired generator as an example,the conventional main steam dehumidification and pressure reduction,main steam with back pressure machine steam supply,steam supply valve coupled steam ejector and other steam supply schemes are simulated and calculated.After detailed system thermodynamic analysis and economic analysis.The results show that the scheme of steam supplement valve coupling steam ejector and the scheme of main steam with back pressure machine have certain energy saving effect compared with the conventional scheme,which can reduce the equivalent coal consumption of power generation by 2.5~3.6 g/(kW·h)and 1.4~3.0 g/(kW·h),respectively.The efficiency of cogeneration is increased by 0.12%~0.42%and 0.05%~0.24%,and the annual coal saving income is 4.173 million yuan and 3.193 million yuan,and the annual net income is 3.573 million yuan and 1.693 million yuan.The scheme of main steam with back pressure machine has a high initial investment,and the payback period is as high as 29.5 a.The scheme of steam valve coupling steam ejector has a good economy,and the payback period is only 5.6 a.It solves the problem of high energy consumption and excessive loss of conventional steam supply system in the face of large flow and high parameter steam supply demand,realizes the cascade utilization of steam energy,and significantly improves the economy of the system.
作者
邢阁玉
孟伟
白兆宇
叶明星
唐海峰
张立新
张一农
徐钢
XING Geyu;MENG Wei;BAI Zhaoyu;YE Mingxing;TANG Haifeng;ZHANG Lixin;ZHANG Yinong;XU Gang(China Energy Hebei Cangdong Power Generation Co.,Ltd.,Cangzhou 061100,Hebei China;Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)
出处
《电力科技与环保》
2025年第1期120-129,共10页
Electric Power Technology and Environmental Protection
基金
国家自然科学基金创新研究群体项目(51821004)。
关键词
热电联产
工业供汽
高参数大流量
性能分析
combined heat and power generation
industrial steam supply
high parameter and high flow rate
performance analysis
