套筒对烧窑新型燃烧室内电石尾气的燃烧特性

通过建立流动、燃烧和辐射换热三维耦合数学模型,研究电石尾气在套筒对烧窑新型燃烧室内的燃烧特性,并考察过量空气系数对燃烧情况的影响.结果表明,电石尾气燃烧产生的烟气受到挡火墙的阻挡,形成强烈的漩涡,火焰高温区出现在挡火墙的内侧.随着过量空气系数的增加,燃料燃烧率逐渐变大,但即使过量空气系数增大至1.3,燃烧室出口仍有CO剩余,即少量燃料会随烟气流动到窑膛内燃尽.随着过量空气系数的增加,燃烧室出口平均温度先上升后下降.

Combustion Characteristics of Calcium Carbide Furnace Off-Gas in a New Type Combustor of Twin Burn Annular Shaft Kiln

A 3D mathematical model of flow, combustion and radiation heat transfer was established to study the combustion performance of calcium carbide furnace off-gas(CCFG)in the combustion chamber and to investigate the impact on combustion from different excess air coefficient. It is found that the flue gas from CCFG burning is blocked by a baffle wall and forms a big vortex, thus the high temperature zone is inside the baffle wall. With the increase of excess air coefficient, the fuel conversion degree becomes larger, but even if the excess air coefficient was up to 1.3, there remained CO in the combustion chamber exit, i.e., a small amount of fuel will burn out in the kiln chamber. As the excess air coefficient increases, the average temperature of gas increases first and then decreases at the exit of combustion chamber.