低热值煤层气燃烧器结构优化的实验研究

对一种低热值煤层气燃烧器进行优化设计,在燃气管内设置导流叶片,并在旋流空气管和燃气管之间增加一根直流空气管,对此燃烧器进行冷态和热态实验,结果表明:改进后的燃烧器旋流强度沿中心轴线比原燃烧器下降平缓,在中心轴线相同位置处大于原燃烧器,改进后的燃烧嚣旋流强度最大值为0.53;改进后的燃烧器燃烧温度沿中心轴线比原燃烧器上升快,在中心轴线0.55 m处,温度达到最大值1 440 K;在相同热负荷下,温度峰值比原燃烧器更靠近喷口,且比原燃烧器大.原燃烧器火焰尾部温度高,火焰长,局部容积热强度低.

Experimental Study of the Structural Optimization of a LHV(low heating value)Coal-bed Gas Burner

Optimized and designed was a LHV coal-bed gas burner with guiding vanes being mounted in the gas tube and a once-through air tube being additionally installed between the swirling flow air tube and the gas tube.Finally,a cold-state and hot-state test were performed respectively of the burner under discussion.The optimized burner has a smoother and slower swirling flow intensity descending along the center axes than the original one and the intensity of the optimized one at a same location on the center axes is bigger than that of the original.The former has a maximal swirling flow intensity of 0.53 and a combustion temperature rise quicker than the latter along the center axes.At a distance of 0.55 m on the center axes,the combustion temperature attains its maximal value of 1440 K.At a same heat load,the temperature peak value of the former is more close to the spout and also bigger than the latter.Furthermore,the original has a higher tail portion flame temperature,a longer flame and a lower local volumetric heat intensity.