3种型号W火焰锅炉结渣特性的数值模拟  

Numerical Simulations of the Slagging Characteristics in Three Types of W-flame Boiler

作　　者：方庆艳[1] 周怀春[1] 汪华剑[1] 罗自学[1] 史铁林[2] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074 [2]华中科技大学机械科学与工程学院,武汉430074

出　　处：《动力工程》2008年第5期682-689,共8页Power Engineering

基　　金：国家高技术发展计划‘863’项目(2006AA05Z301);国家自然科学基金资助项目(50721005)

摘　　要：采用结渣模型耦合气固两相流动燃烧模型,对3种不同型号W火焰锅炉的结渣特性进行了多工况数值模拟,结合实际运行状况,对结渣位置、程度及原因进行了对比分析.结果表明:在燃用结渣倾向相同的煤时,不同型号锅炉的结渣特性有明显差异,这是由于炉膛结构尺寸、下炉膛热力参数、燃烧器类型、分级二次风配风方式等不同造成的;切停侧边燃烧器、降低锅炉负荷和燃用结渣倾向低的煤都能有效减轻侧墙结渣,显著改善锅炉结渣特性.为此,提出了防止W火焰锅炉结渣的措施.The numerical simulations of the slagging characteristics under multi-operating modes in three types of W-flame boiler were carried out by use of the slagging models coupled with the gas-solid two phase flow and combustion models. Combined with the actual operational status, comparative analysis on the slagging position, extent and reasons was represented. The results show that when the coals with same slagging tendency are burned, the slagging characteristics in three types of W-flame boiler are obviously different due to the differences in furnace structural size, thermal parameters in the lower furnace, burner type and secondary air distribution mode. The side wall slagging can be effectively alleviated by means of cutting off the burners close to the side walls, reducing boiler load and burning coals with low slagging tendency. Based on the analysis above, some measures for preventing slagging in W-flame boilers were presented.

关 键 词：能源与动力工程 W火焰锅炉 结渣特性 数值模拟 

分 类 号：TK227.2[动力工程及工程热物理—动力机械及工程]