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贵州无烟煤挥发分含量低、灰分大、灰融点低,是一种难利用的煤种。在热天平试验台上研究贵州无烟煤的燃烧动力学特性,并利用固定床反应器试验台研究贵州无烟煤的NOx生成机制。研究发现,该无烟煤是属于难着火、难稳燃、需要长时间才能燃尽的煤种;氧量的增加使贵州无烟煤NOx生成量增加,对焦碳燃烧阶段的NOx生成影响大;在1 000~1 200℃之间,温度的升高使NOx生成量降低,尤其是焦碳燃烧阶段的NOx生成量大幅降低;粒径的减小使挥发分燃烧阶段的NOx生成量上升,而对焦碳燃烧阶段的NOx生成影响小,当粒径小于68μm时,该无烟煤的NOx生成量显著升高。
Guizhou anthracite volatile content is low, ash, ash melting point is low, is a difficult to use coal. The combustion kinetics of anthracite in Guizhou was studied on a thermocline bench, and the immobilized bed reactor was used to study the mechanism of NOx generation in Guizhou anthracite. The study found that the anthracite coal is difficult to fire, stable combustion, take a long time to burn out of coal; the increase of oxygen content of Guizhou anthracite NOx generation increased, the impact of NOx combustion in the coke combustion stage; in 1000 ~ 1 200 ℃, the increase of the temperature reduces the NOx production, especially the NOx production in the coke combustion stage. The reduction of the particle size increases the NOx production in the volatile combustion stage, while the coke combustion stage The effect of NOx generation is small, and when the particle size is less than 68 μm, the NOx production of the anthracite coal is remarkably increased.