Effects of ash/K2CO3/Fe2O3 on ignition temperature and combustion rate of demineralized anthracite
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摘要: 考察了煤灰/K2CO3/Fe2O3及其之间的相互作用对酸洗无烟煤燃点和燃烧速率的影响。不同温度下制备的煤灰显示了不一样的性质(如化学组成、颜色和形貌)。脱矿无烟煤(负载和非负载催化剂)的燃烧反应性测试在热重分析仪(TG-DTG)中完成,结果表明,煤灰本身对酸洗无烟煤的燃点几乎没有影响,而高温下制备的煤灰能够明显提高酸洗无烟煤的燃烧速率。当煤灰和K2CO3 或者Fe2O3的混合物加入酸洗无烟煤中作为燃烧催化剂时,可以看出与单独使用K2CO3 或 Fe2O3相比,煤灰的加入明显导致酸洗煤的燃烧速率下降,而对其燃点影响不大。同样,K2CO3 和 Fe2O3之间的相互作用也能够对酸洗无烟煤的燃烧速率产生负面影响。
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关键词:
- 煤灰 /
- 催化剂 /
- K2CO3/Fe2O3 /
- 燃点 /
- 燃烧速率
Abstract: The effects of ash/K2CO3/Fe2O3 and their interactions on the ignition temperature and combustion rate of acid-washed anthracite were examined. The coal ashes from combustion of anthracite at different temperatures showed very different properties such as chemical compositions, color and morphology. Reactivities of demineralized anthracite with and without catalysts were measured by thermo-gravimetric analyzer (TG-DTG). The results indicate that ash itself has no catalytic effects on ignition temperature while the combustion rate is improved, especially by the ash prepared at high temperatures. The use of ash with K2CO3 (or Fe2O3) together as combustion catalysts reveals that the interactions (i.e. sintering reactions) between them have caused the reduction in combustion rate, compared with the cases when K2CO3 or Fe2O3 was employed individually. Similarly, the synergistic effect between K2CO3 and Fe2O3 was also observed to lower the combustion rate of demineralized anthracite.-
Key words:
- ash /
- catalyst /
- K2CO3/Fe2O3 /
- ignition temperature /
- combustion rate
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