660MW超临界燃煤锅炉引入生物质气再燃方案及运行特性分析

Introduction of Biomass Gas Reburning Scheme and Operation Characteristics of 660MW Supercritical Coal-Fired Boilers

以某公司660MW超临界燃煤机组锅炉引入生物质气化燃气再燃发电的两个项目(燃气发电功率10MW/20MW)为例,结合"四角切圆"和"前后墙对冲"锅炉的具体特点,选择优化的燃烧器改造方案。针对具体的燃气引入方式,全面分析锅炉运行中NO_x排放、主要参数变化、低负荷稳燃、受热面腐蚀、炉膛结渣等情况,并委托锅炉厂进行掺烧前后的性能核算和计算流体动力学(computational fluid dynamics,CFD)数值模拟计算。各种工况掺烧燃气后,NO_x降低明显,排烟温度增加,锅炉计算效率总体呈降低趋势。

This paper studies two reburning power generation projects with 10 MW/20 MW gas power in a company based on 660 MW supercritical coal-fired unit boilers with biomass gas induced in.The optimized burner modification scheme is selected combined with the specific features of‘four corners cutting circular＇and‘front and back wall hedging＇boilers.According to the specific gas intake method,we comprehensively analyze the NO_x emission,main parameters change,low load stable combustion,heating surface corrosion and furnace slag,etc.Also,the performance accounting and computational fluid dynamics（CFD）numerical simulation calculation are carried out in the commissioned boiler factory before and after mixed burning.The NO_x decreases obviously,the exhaust temperature increases,and the calculation efficiency of the boiler decreases after burning gas intake in various working conditions.