目前国内大部分焦化企业的氮氧化物排放浓度在600~2000mg/m3，严重超过国家标准，所以降低NOx排放量刻不容缓。为了解决立火道内燃烧高 NOx排放的问题，本课题利用 CFD 仿真的方法对立火道内部热过程进行了数值模拟，研究了烟气循环过程中火道内部流场、温度及 NOx 浓度分布并通过分析仿真结果对立火道结构以及运行条件进行优化。选取JN60型焦炉燃烧室的单对立火道为研究对象，在不影响计算结果的前提下对设计图中相关结构进行了简化，具体几何模型如图所示。以高炉煤气为燃料，通过计算得出每对立火道所需燃气流量为 0.03418kg/s， 空气流量为 0.03kg/s，立火道加热壁面设置为恒热流边界为-7927.27W/m²。

At present, the NOx emission concentration of most domestic coking enterprises is 600~2000mg/m3, which seriously exceeds the national standard, so it is urgent to reduce NOx emission. In order to solve the problem of high NOx emission from combustion in the heating flue, the internal thermal process of the heating flue is numerically simulated by CFD simulation method, the internal flow field, temperature and NOx concentration distribution during flue gas circulation are studied, and the structure and operating conditions of the heating flue are optimized by analyzing the simulation results. The heating flue of JN60 coke oven combustion chamber is selected as the research object. The specific geometric model is shown in the figure. Taking blast furnace gas as fuel, it is calculated that the gas mass flow rate required for each heating flue is 0.03418kg/s, the air mass flow rate is 0.03kg/s, and the heating wall surface of the heating flue is set as constant heat flow, and the boundary is -7927.27W/m².