3种型号W火焰锅炉结渣特性的数值模拟

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.

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

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.