【摘要】 为促进沼气的实际应用，解决燃烧器对沼气热值变化的适应性问题，设计了一台基于沼气的多孔介质燃烧换热器．通过试验研究了沼气热值变化时，不同燃烧强度、不同水量下多孔介质燃烧换热器的燃烧室壁面温度分布、热效率及污染物排放情况．结果表明：沼气中甲烷含量为50%～70%时均可在燃烧换热器中稳定燃烧，燃烧室壁面温度变化在75℃以内；热值瞬时变化时，燃烧换热器仍能维持稳定燃烧，出口水温相较于燃烧室壁面最高温度响应速度略滞后；燃烧换热器有良好的换热能力，热效率随燃烧强度的增加而减小，随燃气热值和水量的增加而增加；尾部换热器传热系数和燃烧室传热系数都随燃烧强度的增加而增加；NOx排放随燃烧室壁面温度降低而降低，最高为27 mg/m~3;CO排放量最大为151 mg/m~3。更多还原

【Abstract】 To promote the practical application of biogas and solve the adaptability of the burner to the change of biogas calorific value. A porous medium combustion heat exchanger based on biogas is designed. The combustion chamber wall temperature distribution, thermal efficiency and pollutant emission of porous medium combustion heat exchanger were studied under different firing rate. In addition, there are these characteristics under different calorific values and water quantity. The results show that when the methane content in biogas is 50%-70%, it can be burned stably in the combustion heat exchanger. The transverse temperature change of the combustion chamber wall is within 75 ℃. When the calorific value changes instantaneously, the combustion heat exchanger can still maintain stable combustion. The outlet water temperature lags slightly behind the response speed of the highest temperature on the combustion chamber wall. The combustion heat exchanger has good heat exchange capacity. Thermal efficiency decreases while increasing the firing rate and increases while increasing the gas calorific value and water quantity. Both the heat transfer coefficient of the tail heat exchanger and the heat transfer coefficient of the combustion chamber increase while increasing the firing rate. NOx emissions decrease while decreasing the combustion chamber wall temperature, and the highest is 27 mg/m~3. The maximum CO emissions are 151 mg/m~3.更多还原