WNS型燃气锅炉在不同热负荷下燃烧的研究

Research on the Combustion In WNS Gas-fired Boiler at Different Heat Load

燃气锅炉热负荷的变化影响着燃料的消耗量,炉膛内的速度场、温度场也随着发生变化。为了详细研究变热负荷对燃气锅炉内速度场、温度场、燃料浓度变化的影响,利用FLUENT软件对波形炉胆在100%、75%、50%和25%热负荷下的燃烧进行数值模拟,过量空气系数取1.1;选取甲烷体积分数为96%的天然气作为燃料。通过对不同热负荷下炉膛内的燃烧进行数值模拟,得出变热负荷对燃气锅炉内燃烧的影响,为WNS型燃气锅炉的实际运行提供理论支持,具有一定的工程应用价值。

WNS gas-fired boiler is widely popular with people for the characteristics of simple structure, saving energy, environmental protection and high efficiency, its quantity demand is in- creased quickly at home. With the change of heat load in WNS gas-fired boiler, fuel consumption is changed, furthermore, the velocity field and temperature field in the boiler is changed. For a detail study to the influence of the changeable heat load on velocity field, temperature field and the variation of fuel concentration, a numerical simulation for the combustion in gas-fired boiler at 100%, 75%, 50% and 25% hear load will be undergo by the FLUENT software; 1.1 was selected as the excess air coefficient; nature gas is selected as fuel, in which methane content is 96%. Finally, the influence of the changeable heat load on the combustion in gas-fired boiler can be gained, which can provide theoretical support for the operation and has definite application value.