660 MW超超临界CFB锅炉失电事故下受热面安全性分析及紧急补水泵选型  

Safety Analysis of Heating Surfaces and Selection of Emergency Water Supply Pump for a 660 MW Ultra-supercritical CFB Boiler Under Power Failure Condition

作　　者：李银龙 杨冬[1] 李维成 邓启刚 周旭 鲁佳易 周棋 LI Yinlong;YANG Dong;LI Weicheng;DENG Qigang;ZHOU Xu;LU Jiayi;ZHOU Qi(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Key Laboratory for Clean Combustion and Flue Gas Purification of Sichuan Province,Chengdu 611731,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]清洁燃烧与烟气净化四川省重点实验室,成都611731

出　　处：《动力工程学报》2022年第5期393-401,412,共10页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(52076172);国家重点研发计划资助项目(2016YFB0600201)。

摘　　要：以某电厂660 MW超超临界循环流化床(CFB)锅炉为研究对象,建立了锅炉在失电事故发生后受热面内的瞬态流动传热计算模型,开发了以Fortran语言为基础的受热面内瞬态流动传热计算程序,通过计算得到了锅炉失电后考虑金属管壁蓄热时受热面出口工质温度和管壁温度等热力参数的变化规律。结果表明:该CFB锅炉配备压力为35 MPa、输水量为140 t/h的紧急补水泵可以保证受热面壁温安全,研究结果对带有外置床的超(超)临界CFB锅炉紧急补水泵选型及电厂处理此类事故具有重要意义。Taking a 660 MW ultra-supercritical circulating fluidized bed(CFB)boiler as the research object,the calculation model of flow and heat transfer on heating surfaces under power failure condition was established,and a calculating program for the transient characteristics of heating surfaces was developed based on Fortran language.Variation laws of working medium and tube wall temperature at the outlet of heating surfaces were calculated when the heat storage of metal tube wall was considered under power failure condition.Results show that the boiler equipped with an emergency water supply pump with a pressure of 35 MPa and a water delivery capacity of 140 t/h can ensure the wall temperature safety of heating surfaces.The results are of great significance for the selection of emergency water supply pump and the treatment of these conditions in(ultra)supercritical CFB boilers with the external bed.

关 键 词：超超临界CFB锅炉 失电事故 紧急补水泵 受热面 安全性 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]