超低热值燃气燃烧及CO排放控制研究

Study On Combustion And CO Emission Control Of Ultra-low Calorific Gas

中文关键词: 多孔介质，超低热值燃气，CO排放

英文关键词: porous media, ultra-low calorific gas, CO emission

中文摘要:

      针对超低热值燃气燃烧CO排放高的问题，设计开发了同心套筒多孔介质燃烧系统，分别研究了过量空气系数、水蒸气和氧气对以CO为单一可燃气体的超低热值燃气的燃烧特性及污染物排放的影响。结果表明：在预热阶段，内部点火相比较于外部点火能够减少1/3的预热时间；热值为3.0MJ/m3的超低热值气体在增大过量空气系数时，能够有效降低CO排放，而2.5MJ/m3和2.0MJ/m3的超低热值燃气没有效果；空气系数为1.00的条件下，通过添加质量分数为2%~4%的水蒸气未能降低CO排放；在超低热值燃气中通入氧气可以有效降低CO排放，空气系数为1.00时，在3.0MJ/m3的超低热值燃气中添加质量分数为12%的氧气，CO排放最低能降到53×10-6。

英文摘要:

      Aiming at the problem of high CO emission in ultra-low calorific value gas combustion, a dual-tube porous medium combustion system was designed and developed. The effects of excess air ratio,, water vapor and oxygen on the combustion characteristics and pollutant emissions of ultra-low calorific value gas with CO as a single combustible gas were studied. The results show that during the preheating phase, the internal ignition phase can reduce 1/3 warm-up time compared to the external ignition; the ultra-low calorific gas with a heating value of 3.0 MJ/m3 can effectively reduce the CO emission when increasing the excess air ratio, while 2.5 MJ/m3 and 2.0MJ/m3 of ultra-low calorific gas have no effect; under the condition of air coefficient of 1.0, the addition of water vapor with a mass fraction of 2%~4% fails to reduce CO emission; adding oxygen into ultra-low calorific gas can effectively reduce CO emissions. When the air coefficient is 1.0, the oxygen content of 12% is added to the ultra-low calorific of 3.0MJ/m3, and the CO emission can be reduced to 53×10-6.