【摘要】 采用k-ε湍流双方程模型、非预混燃烧模型和P1辐射传热模型,对低浓度煤层气扩散燃烧过程进行了数值模拟。比较了不同结构形式和不同射流参数对低浓度煤层气燃烧过程的影响。结果表明:燃气喷口与燃烧空间中心轴线的距离、燃气向空气偏转角度、空气和燃气的速度比对煤层气扩散燃烧有很大影响。当燃气喷口与中心的间距为30mm,燃气向空气偏转角度为45°,空气和燃气的速度比为2时,燃烧效果较好。更多还原

【Abstract】 It is important to utilize coal bed methane to achieve the safe,environmental and economic benefits.The authors simulate the processes of multi-jet diffusion combustion of low concentration coal bed methane using k-ε turbulence model,non-premixed combustion model and P1 radiation model.The influences of different geometrical structures and operating parameters on the combustion process are compared with each other.The results show that the distance between the gas nozzles and central axis,the angle of gas deflected from air,the velocity ratio of air to gas have important impacts on the combustion.When the distance,the deflection angle and the velocity ratio are 30 mm,45 °and 2,respectively.The best combustion result can be achieved.更多还原