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采用数值模拟法,研究了高温空气燃烧炉内不同空气预热温度、氧气浓度和燃气入口温度对火焰特性和NOx生成和排放的影响规律。研究表明,在提高空气预热温度、降低氧气浓度条件下,在较大范围内进行燃烧,火焰体积变大,炉内温度的峰值相应降低,温度分布更均匀,NOx的生成量大幅度降低。提高燃气入口温度,可抑制燃料和空气在主燃烧区的混合,使火焰内反应物的分布更加均匀,抑制了热力NO的生成,从而减少了NOx的排放量。
Numerical simulation was used to study the influence of different air preheating temperature, oxygen concentration and gas inlet temperature on flame characteristics and NOx generation and emission in a high-temperature air furnace. The results show that when the preheating temperature and the oxygen concentration are decreased, the combustion takes place in a wide range, the volume of the flame increases, the peak temperature in the furnace decreases correspondingly, the temperature distribution is more uniform, and the formation of NOx greatly decreases. Increasing the temperature of the gas inlet can restrain the mixing of fuel and air in the main combustion zone and make the distribution of reactants in the flame more uniform and suppress the generation of thermal NO thereby reducing the NOx emission.