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石油化工加热炉中燃油的燃烧是一个复杂的综合过程 ,包括燃油液雾的蒸发及流动、气相的流动及燃烧、燃烧空间对换热器和炉壁的对流传热及辐射传热等诸多子过程。同时 ,大多数实际加热炉中的流动均处于湍流状态 ,必须考虑湍流对气体及燃油液雾流动过程的影响 ,以及湍流对燃烧过程的影响。本文建立了模拟加热炉中的燃油液雾燃烧过程的综合数学模型 ,其中对气相湍流流动采用k -ε模型 ,对燃油液雾相湍流流动采用湍动能输运方程模型 ,湍流燃烧采用EBU -Arrhenius模型 ,辐射传热采用离散坐标模型。气相以及燃油液雾相的诸控制方程均建立在欧拉坐标系下。气相控制方程组、颗粒相控制方程组和辐射热流控制方程组都具有相同的方程形式 ,对上述方程可采用统一的数值求解方法。
The burning of fuel in a petrochemical heating furnace is a complex and complex process involving the evaporation and flow of fuel liquid mist, the flow and combustion of the gas phase, the convective heat transfer and radiative heat transfer of the combustion space to the heat exchanger and the furnace wall, process. At the same time, the flow in most real furnaces is in a turbulent state. The effects of turbulence on the flow of gas and fuel-liquid mist and the effects of turbulence on the combustion process must be considered. In this paper, a mathematical model of the combustion process of fuel liquid mist in simulated heating furnace was established. The k-ε model was used for the gas-phase turbulent flow and the turbulent kinetic energy transport equation model was used for the turbulent flow of the fuel liquid. The turbulent combustion was carried out by EBU-Arrhenius Model, radiation heat transfer using discrete coordinate model. The governing equations of the gas phase and the liquid phase of the fuel mist are based on the Euler coordinate system. The gas phase control equations, the particle phase control equations and the radiant heat flow control equations all have the same equation form, and a uniform numerical solution method can be adopted for the above equations.