再生加热炉流动及燃烧特性的数值模拟分析

Numerical Simulation of Flow and Combustion Properties of Regeneration Furnace

应用计算流体力学方法,采用标准k-ε湍流模型、离散坐标辐射模型和涡耗散燃烧反应计算模型,对再生加热炉简化模型4种不同热负荷下的燃烧过程进行数值模拟,重点研究了炉内的流场、温度场及烟气组分分布等信息。数值结果表明:燃烧火焰受回流区影响向炉壁一侧倾斜,烟气组分分布与炉内速度场和温度场一致。通过对加热炉最大热负荷工况下过剩空气量、烟气出口回流温度及炉内负压的优化调整,使得出口流速降低,炉膛中心温度增加。理论结果为有效控制炉内的燃烧过程,优化模型参数及提高管式加热炉热效率提供参考。

By using CFD method, standard k-ε, turbulence model, discrete ordinate radiation model and eddy dissipation combustion model, four combustion processes under different loads for simplified regeneration furnace model were simulated. The flow field, temperature field and composition distribution of flue gas were emphatically studied. It was shown from the results that the flame leans on one side which is on the effect of recirculation zone, and the composition distribution of flue gas is the same as flow field and temperature field. By adjusting excess air in furnace under the maximum heat load, the temperature at flue gas outlet and vacuum in furnace, the temperature in the center of the furnace was increased and the flow velocity at outlet was reduced. Theoretical study provided reliable reference in effectively controlling the combustion process in the furnace, optimizing the parameters of model and raising the efficiency of pipe heating furnace.