600 MW机组锅炉受热面优化改造降低主再热减温水量研究  

Analysis of Solution Measures of 600MW Boiler SH and RH Attemperating Water

作　　者：苏岳亮 陈辉 SU Yue-liang;CHEN Hui(GuoNengTongling Power Generation Co.,Ltd.;GuoDian Science and Technology Research Institute)

机构地区：[1]国能铜陵发电有限公司 [2]国电科学技术研究院有限公司

出　　处：《电站系统工程》2023年第5期21-23,共3页Power System Engineering

摘　　要：以某电厂600 MW亚临界四角切圆燃烧方式锅炉为研究对象,由于锅炉原设计和低氮燃烧器改造造成锅炉过热减温水量和再热减温水量严重高于设计值。满负荷时过热减温水量大于设计值90.5 t/h,再热减温水量大于设计值82.9 t/h,影响机组热耗增加约72.2 kJ/kW·h。为了降低锅炉减温水量,提高机组经济性,通过过热器、再热器和省煤器受热面优化改造,封堵侧墙墙式再热器面积约10%,减少后屏再热器受热面积约20%,减少末级再热器受热面积约25%,减少水平低温过热器受热面积约50%,增加省煤器受热面积约40%,在末级再热器屏底下方增设吹灰器。优化改造后,锅炉过热器和再热器减温水量大幅降低,满负荷下过热器和再热器减温水量分别降低约90 t/h和67 t/h,降低机组供电煤耗约2.50 g/kW·h。A boiler with 600 MW subcritical four-corner tangential combustion mode in a power plant is studied.Due to the original design of boiler and the transformation of low nitrogen burner,the Attemperating water of boiler superheater(SH)and reheater(RH)are seriously higher than the design value.The amount of SH attemperating water at full load is greater than the design value of 90.5 t/h,and the amount of RH attemperating water is greater than the design value of 82.9 t/h,which affects the increase of heat consumption of unit about 72.2 kJ/kWh.In order to reduce the cooling water of the boiler and improve the economy of unit,the heating surface of the SH,RH and economizer is optimized,the area of the wall reheater is about 10%,the heating area of the rear screen reheater is about 20%,the heating area of the last stage reheater is about 25%,the heating area of the horizontal low temperature superheater is about 50%,and the heat⁃ing area of the economizer is about 40%.After the optimization transformation,the boiler superheater and the reheater re⁃duce the amount of attemperating water by a large margin,and the superheater and reheater reduce the amount of attem⁃perating water by about 90 t/h and 67 t/h under full load respectively,and reduce the unit power supply coal consumption by about 2.50 g/kWh.

关 键 词：电站锅炉 过热减温水量 再热减温水量 受热面改造 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]