Effect of K2CO3 and Fe2O3
on combustion reactivity of pulverized coal by thermogravimetry analysis
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摘要: 利用综合热重分析仪分别研究了K2CO3、Fe2O3对褐煤、烟煤、无烟煤、石墨等不同燃料的催化燃烧反应性的影响。结果表明，催化剂种类、添加量、粒径和燃料的变质程度对催化燃烧具有一定的影响；向无烟煤中加入K2CO3、Fe2O3两种催化剂，无烟煤的燃点由458℃分别降为319℃、405℃，燃烧速率由11.94%/min分别提高到26.40%/min、17.66%/min。K2CO3、Fe2O3对褐煤和烟煤的燃点没有明显的降低作用，但是对无烟煤和石墨燃点有明显的降低作用，且随着煤变质程度的增加，燃点降低幅度增大。由于引起燃点和燃速变化的原因不同，所以加入催化剂后造成燃点和燃速的变化也不同。Abstract: The effects of K2CO3， Fe2O3 on catalytic combustion reactivity of different rank fuels such as lignite, bituminous coal, anthracite and graphite were investigated by a synthetical thermal analyzer. The results show that the type and content of catalysts, particle size and rank of fuel are important factors influencing catalytic combustion. When K2CO3 and Fe2O3 were added, ignition temperature of anthracite decreases from 458℃ to 319℃ and 405℃, respectively. And its combustion rate increases from 11.94%/min to 26.40%/min and 17.66%/min, respectively. There are not evident effects of K2CO3， Fe2O3 on decreasing ignition temperature of lignite and bituminous coal, but ignition temperature of anthracite and graphite decreases remarkably. With increasing rank of fuel, extent of decreasing ignition temperature is enhanced. Due to different factors led to changes of ignition temperature and combustion rate which changes are different too when catalyst is present.
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Key words:
- catalytic combustion /
- ignition temperature /
- combustion rate /
- fuel rank
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