石油化工燃油加热炉中液雾燃烧的数学模型

COMPREHENSIVE NUMERICAL MODEL FOR SIMULATING SPRAY COMBUSTION IN FURNACES IN PETROCHEMICAL TECHNOLOGY

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。

Simulation of spray combustion process involves modeling of a number of complex simultaneous interdependent processes In this paper, a comprehensive mathematical model for simulating spray combustion is developed based on Eulerian treatment for both gas phase and spray droplets In addition, a modified k-ε-kp two phase turbulence model, a second-order moment turbulence-chemistry model for NO x formation and soot formation model were incorpoorated into the comprehensive model For gas phase combustion as well as radiation heat transfer, the convertional EBU-Arrhenius model and the discrete ordinates (DO) model were used