垃圾热解气燃烧炉的数值模拟研究

Numerical Simulation Study of Waste Pyrolysis Gas Burner

摘要: 描述了用于固体垃圾热解气处理的工业燃烧炉结构特点，采用非预混燃烧模型对热解气燃烧过程进行数值模拟。通过比较两种不同内部结构的燃烧炉中流场、温度场和组分浓度场分析了不同燃烧炉的热解气燃烧效果。结果表明，燃烧炉内热解气和空气以螺旋流动形式进行混合、燃烧，其中A结构燃烧炉由于收缩口的节流混合效应，强化了混合燃烧过程，使得炉内温度更高、CO等可燃组分浓度更低。同时，需要保持适当过量的空气用量以保证充分燃烧且避免空气的冷却效应；特别地，当热解气中可燃组分含量较低时，需要考虑升温措施以保证二噁英等物质的热解环境。

Abstract: The industrial combustion furnace for pyrolysis gas of solid waste is described. The combustion process of pyrolysis gas is simulated with a non-premixed combustion model. The velocity, temperature and component concentration field are compared for the two kinds of internal furnace structures to analyze the combustion performance in different combustion furnaces. The results show that the pyrolysis gas and air are mixed and burned in the form of spiral flow in the combustion furnace. The A structure furnace strengthens the mixture and combustion process due to the throttling effect of the contraction port, which leads to the higher temperature and the lower concentration of combustible components such as CO. Meanwhile, it is necessary to maintain an appropriate excess air amount to ensure full combustion and to avoid the cooling effect of air. On the other hand, when the content of combustible components in pyrolysis gas is low, certain heating strategy should be considered to ensure the pyrolysis environment of dioxins and other substances.