Based on the model of the FLUENT vortex dissipation, using the method of the limited volume, the mathematics model of the burning and diffusing phase is build. And so nozzle combustor is simulated whose long is 2. 9 meters and diameter is 0. 5 meter numerically. Research indicates: with the methane concentration in the CBM increasing, the peak concentration of the oxygen moved to the right, the maximum temperature and the average temperature gradually increase in the CBM; with the speed ratio increasing, the methane burn faster; with excess air coefficient increasing, the maximum temperature in the non-premixed system move to the right. This result supply the theory instruction for the actual product.%基于计算流体力学的涡耗散模型,采用有限容积法建立组分燃烧与扩散数学模型.针对长为2.9m,直径为0.5 m的喷口型燃烧器进行数值模拟.研究表明:随着煤层气中甲烷浓度的增加,氧气浓度的峰值逐渐右移,非预混系统的最高温度与平均温度都有所增加.随着速度比的逐渐增加,煤层气中甲烷燃烧较快；随着过量空气系数的增加,非预混系统燃烧温度最大值逐渐右移.该结果可为生产实际提供一定的理论指导.
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