逆向式蓄热高温空气燃烧换向的动态分析
Dynamic Analysis on Commutation of Regenerative High Temperature Air Combustion With Reverse Direction
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摘要: 模拟了逆向式蓄热高温空气燃烧换向的动态燃烧特性。研究表明,随着时间的推移,炉膛内火焰的最高温度降低,平均温度升高,炉膛温度变得更加均匀;随着氧气质量分数的降低,氮氧化物质量分数随时间变化产生的变化幅度减小,燃烧变化更加平稳;随着预热空气温度上升,炉膛内的最高温度和平均温度都有不同程度的上升,氮氧化物生成量也相应增加,但随着氧气质量分数降低,影响逐步减小。在燃料速度为0.25、0.5m/s对比分析中,综合考虑了温度场、氮氧化物和二氧化碳的质量分数,在低氧条件下应优先采用燃料速度为0.25m/s的燃烧方式。Abstract: The authors simulated the dynamic properties of the regenerative high temperature air combustion system with reverse direction. It can be found from the results that, with the increasing of time, the flame's highest temperature in the furnace decreases, the average temperature increases, and the temperature in furnace became more even. With the decreasing of oxygen concentration, the concentration of NOx reduces. With the increasing of preheat air temperature, the highest and average temperatures, and the amount of nitrogen oxide also increase, inversely, the influence become smaller. It is also seen from the contrast analysis on temperature field for the concentration of nitrogen oxide and carbon dioxide at the fuel velocity of 0.25 m/s and 0.5 m/s that the dynamic properties of low oxygen combustion system at the fuel velocity of 0.25 m/s are preferred.