发电技术2024，Vol.45Issue(2)：240-249,10.DOI:10.12096/j.2096-4528.pgt.23134
不带外置床的700MW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
摘要
Abstract
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Key words
ultra-supercritical/circulating fluidized bed(CFB)boiler/power failure/heat load/water wall分类
能源科技引用本文复制引用
邓启刚,吕卓,石友,鲁佳易,周旭,王奥宇,杨冬..不带外置床的700MW超超临界循环流化床锅炉失电后水冷壁安全计算分析[J].发电技术,2024,45(2):240-249,10.基金项目
国家重点研发计划项目(2022YFB4100303). Project Supported by National Key R&D Program of China(2022YFB4100303). （2022YFB4100303）
