采用k-ε湍流双方程模型、PDF燃烧模型以及离散坐标辐射传热模型，对低热值煤气高温空气燃烧过程进行了计算机辅助模拟试验，比较了不同预热温度和不同过量空气系数对低热值煤气燃烧过程的影响，为低热值煤气蓄热式双预热烧嘴的研制提供了理论指导。

The numerical simulations of high temperature air combustion (HiTAC) for burning low heat value gas have been carried out. The standard k-e turbulent model with a wall function, assumed β probability function density (PDF) combustion model, discrete ordinates (DO) radiation model and thermal NOX model were used in the simulation. The simulation results indicated that both the burner structure and operation parameters played important roles on combustion temperature field and NOX emission, and that the flame temperature and NOX emission decreased with the reduced preheated combustion air temperature and the increased heat flux through furnace wall. Simulated high NOX concentration field was predicted to be outside of flame, which was in agreement with experimental results. Delaying the mixing of combustion air stream and fuel gas stream in HiTAC would decrease the maximum flame temperature and NOX emission.

从工程实际出发，本文提出了高温空气低燃气浓度燃烧新技术，即充分利用烟气余热提高助燃空气温度，提高热能利用率；同时通过优化喷口结构，提高燃气射流速度，使燃气射流在同空气射流混合燃烧前卷吸大量炉内烟气，从而降低燃气射流中的可燃物浓度，进而降低氮氧化物的排放。通过数值模拟研究表明，通过燃气射流速度从4.56m/s提高到55.26m/s，可以降低NOx的排放；当围绕燃气喷口的六个圆形空气喷口改为两个矩形喷口时，燃气射流可从两侧卷吸更多的炉内烟气，形成低燃气浓度燃烧，从而大大降低了NOx的排放。