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本文对积木式结构多孔介质燃烧器稳定燃烧超低热值燃气的功率范围进行了试验研究。用甲烷和氮气配制了试验燃气的热值为1.4~3.0 MJ/m~3,在理论当量比条件下组织了预混燃烧。通过改变甲烷的流量,测试了不同燃烧强度工况下燃烧室壁面的温度分布,进而判定了各工况条件下燃烧室内是否能保持稳定燃烧。结果表明,本文所设计的燃烧器对于超低热值气体有着良好的适应性,对于热值高于1.4 MJ/m~3的气体都有一个稳定燃烧的功率区间,且稳定燃烧的功率范围随着气体热值的增大而增大。在预热温度为1200 K的前提下,燃气热值为1.4 MJ/m~3时,稳定燃烧的燃烧强度范围为30.57~107.01 kW/m~2,而当气体热值为3.0 MJ/m~3时,燃烧极限的近似范围是107.01~229.30 kW/m~2。
In this paper, the power range of the combusting porous medium burner for stable combustion of ultra low calorific value gas has been studied. The calorific value of the test gas prepared from methane and nitrogen was 1.4 ~ 3.0 MJ / m ~ 3, and the premixed combustion was organized under the theoretical equivalence ratio. By changing the flow rate of methane, the temperature distribution of the wall of the combustion chamber under different combustion intensity conditions was tested, and then it was judged whether the combustion chamber could maintain stable combustion under each working condition. The results show that the burner designed in this paper has good adaptability to ultra low calorific value gas and has a steady combustion power range for gas with calorific value higher than 1.4 MJ / m ~ 3. The stable combustion power range Gas heat value increases and increases. When the gas heat value is 1.4 MJ / m ~ 3, the combustion intensity range of stable combustion is 30.57 ~ 107.01 kW / m ~ 2 when the preheating temperature is 1200 K and the gas heat value is 3.0 MJ / m ~ 3, the approximate range of combustion limit is 107.01 ~ 229.30 kW / m ~ 2.