降低褐煤锅炉排烟温度的方案研究  

Study on the Scheme of Reducing the Exhaust Temperature of a Lignite Boiler

作　　者：赵兴春[1] 王进军[1] ZHAO Xingchun;WANG Jinjun(Northwest Electric Power Design Institute Co.,Ltd.,Xi'an 710075,China)

机构地区：[1]西北电力设计院有限公司,西安710075

出　　处：《动力工程学报》2023年第6期686-691,734,共7页Journal of Chinese Society of Power Engineering

摘　　要：为解决褐煤锅炉的高排烟温度问题,通过机炉一体化系统设计,调整锅炉受热面设计方案,在省煤器上游设置预省煤器,并增设工质为某级高加上游低温高压给水的分流省煤器,根据相应的热平衡变化调整空气预热器设计即可获得较低的排烟温度。最后,以某印尼褐煤机组数据为边界条件进行了计算。结果表明:排烟温度从171℃降低至107.8℃时,锅炉效率升高3.96个百分点,但热耗率上升99.12 kJ/(kW·h),综合节煤是目前所有褐煤机组的共性问题,本文的解决方案对于类似项目都有很好的指导和借鉴意义。In order to solve the problem of high exhaust temperature of a lignite boiler,the integrated system of steam turbine and boiler was designed.Through optimizing the design scheme of boiler heating surface,a pre-economizer was arranged upstream of the economizer.The inlet of the shunt economizer was the low temperature and high pressure water supplied from the upstream of a high pressure heater,and the lower exhaust temperature could be obtained by adjusting the design of air preheater according to the corresponding change of heat balance.Finally,the boundary conditions of an Indonesian lignite unit were calculated.Results show that when the exhaust temperature decreases from 171℃to 107.8℃,the boiler efficiency is increased by 3.96%,but the heat consumption is increased by 99.12 kJ/(kW·h).Comprehensive coal saving is the common problem of all lignite units at present.The solutions in this paper have good guidance and reference significance for similar projects.

关 键 词：分流省煤器 组合式空预器 褐煤锅炉 排烟温度 计算分析 

分 类 号：TK114[动力工程及工程热物理—热能工程]