不带外置床的700 MW超超临界循环流化床锅炉失电后水冷壁安全计算分析  

Safety Calculation and Analysis of Water Wall for a 700 MW Ultra-Supercritical Circulating Fluidized Bed Boiler Without External Bed After Power Failure

作　　者：邓启刚 吕卓 石友 鲁佳易 周旭 王奥宇 杨冬[3] DENG Qigang;LÜZhuo;SHI You;LU Jiayi;ZHOU Xu;WANG Aoyu;YANG Dong(Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province,Chengdu 611731,Sichuan Province,China;DongFang Boiler Co.,Ltd.of Dongfang Electric Group,Zigong 643001,Sichuan Province,China;State Key Laboratory of Multiphase Flow in Power Engineering(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China)

机构地区：[1]清洁燃烧与烟气净化四川省重点实验室,四川省成都市611731 [2]东方电气集团东方锅炉股份有限公司,四川省自贡市643001 [3]动力工程多相流国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《发电技术》2024年第2期240-249,共10页Power Generation Technology

基　　金：国家重点研发计划项目(2022YFB4100303)。

摘　　要：通过对某660 MW电厂失电事故过程中烟气温度、蒸汽温度及工质流量的变化规律进行分析,得到了炉膛密相区、过渡区及稀相区热负荷随时间的变化规律。在此基础上,以某700MW超超临界循环流化床(circulating fluidized bed,CFB)锅炉为对象,建立了失电事故发生后水冷壁内的流动传热计算模型,开发了以Fortran语言为基础的水冷壁内瞬态特性计算程序。分别对密相区、过渡区及稀相区进行分析,通过计算得到了失电后的水冷壁壁温及出口工质温度等热力参数的变化规律。计算结果表明:失电后水冷壁密相区出口的最高壁温为558.6℃,稀相区出口的最高壁温为579.6℃,不需要配备紧急补水泵来保证失电后水冷壁的安全。研究结果可为电厂处理超超临界CFB锅炉失电事故提供指导。By analyzing the change laws of flue gas temperature,steam temperature and working fluid mass flow during a power failure accident in a 660 MW power plant,the change laws of heat load in dense phase zone,transition zone and dilute phase zone over time were obtained.On this basis,a 700 MW ultra-supercritical circulating fluidized bed(CFB)boiler was taken as the research object,the calculation model of flow and heat transfer in water wall after power failure accident was established,and a calculation program for the transient characteristics of the water wall was developed based on the Fortran language.The dense phase zone,transition zone and dilute phase zone were analyzed,respectively.Through calculation,the change laws of the thermal parameters such as water wall metal temperature and working fluid temperature after power failure accident were obtained.The calculation results show that,after the power failure accident,the maximum water wall metal temperature at the outlet of dense phase zone is 558.6 ℃,and the maximum water wall metal temperature at the outlet of dilute phase zone is 579.6 ℃.Therefore,there is no need to equip emergency water supply pump to ensure the safety of the water wall after power failure.The research results can provide guidance for power plants to deal with power failure accidents of ultra-supercritical CFB boilers.

关 键 词：超超临界 循环流化床(CFB)锅炉 失电 热负荷 水冷壁 

分 类 号：TK22[动力工程及工程热物理—动力机械及工程]