旋风炉空气动力学和烟气再循环数值模拟  

Numerical investigations on the aerodynamics and flue gas recirculation optimization of cyclone-fired coal boiler

作　　者：秦世泰 杜俊硕 李驰 周永清 QIN Shitai;DU Junshuo;LI Chi;ZHOU Yongqing(CHN Energy Shandong Penglai Power Generation Co.,Ltd.,Yantai 265600,China;Yantai Longyuan Power Technology Co.,Ltd.,Yantai 264006,China;School of Mechanical Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]国家能源蓬莱发电有限公司,山东烟台265600 [2]烟台龙源电力技术股份有限公司,山东烟台264006 [3]天津大学机械工程学院,天津300350

出　　处：《热力发电》2024年第1期53-63,共11页Thermal Power Generation

摘　　要：旋风炉作为一种液态排渣炉,其空气动力学特性与煤粉炉存在显著差异,目前尚缺乏可有效指导旋风炉设计和运行的计算流体动力学(CFD)模型。对此,开发了一种旋风炉CFD数值模型,该模型通过渣层煤粒捕集模型将熔融渣层对煤粒的捕集作用结合在模型中。将该模型应用于某550 MW机组旋风炉的空气动力学特性和烟气再循环(FGR)优化设计研究。研究表明,旋风筒产生的强旋流场使炉内流场分布极不均匀,导致了炉内局部高温和水平烟道入口的严重结渣问题。因此,FGR喷口应根据炉内的不均匀流场和温度分布进行针对性设计,以有效消除炉内的局部高温区域。模拟计算和现场实施结果表明,通过FGR优化设计,炉膛局部高温和严重结渣问题得到了有效缓解。As a kind of slag-tap boiler,cyclone-fired boilers exhibit significantly different aerodynamics comparing with pulverized coal(PC)boilers.However,by far there are still lack of CFD models that are able to provide effective guidance to the design and operation of cyclone-fired boilers.A CFD model of cyclone-fired boilers was developed in which the capture of coal particles by the molten slag layer was considered through a slag layer coal particle capture model.This model was then employed to investigate the aerodynamics and flue gas recirculation(FGR)optimization design of a 550 MW cyclone-fired boiler.The results demonstrate the highly nonuniform characteristics of furnace aerodynamics of cyclone-fired boilers due to the strong swirling flows created by the cyclones leads to the formation of localized high temperature zones and severe boiler fouling problems at the entrance of boiler convection pass.Thus,it is critical to adapt the FGR design with the nonuniform furnace flow and temperature distributions.The simulation results show that,with the optimized FGR design,the high temperature zones and the resulting severe fouling problems were effectively mitigated.

关 键 词：旋风炉 灰渣层 计算流体动力学 烟气再循环 结渣 

分 类 号：TM621.2[电气工程—电力系统及自动化]