Abstract:

A pair of vertical flues of JN60 coke oven combustion chamber are selected.The CFD numerical simulation is used to establish a coupled model of air depleted combustion intensity and combustion fluid multi-concentration field.The heat mass transfer process was simulated,and the calculation results are basically consistent with the design values.On this basis,heat flux density of the coke oven and turn point size were changed to minimize the NOx emission fundamentally.The simulation result shows that the heat flux density has much influence on the NOx,i.e.when the heat flux density is 4,800 W/m2,the NOx concentration is 742 mg/m3,when the heat flux density reaches 7,600 W/m2,the NOx concentration drops down to 135.1 mg/m3，reduced by about 600 mg/m3；similarly,the more opening of the turn point,the higher inner circulation rate,the wider reaction zone,the lower consumption rate of the reactant and the lower NOx formation as a result.