New method of investigating catalyzed combustion characteristics of pulverized coal:
referenced DTA
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摘要: 利用综合热重分析仪研究了煤粉催化燃烧特性的新方法，即参比DTA法。利用参比DTA法测出加入K2CO3、Fe2O3、CaCO3 和CeO2 后无烟煤的燃点分别为319℃、410℃、400℃和405℃，同时在参比DTA曲线上直接看出催化剂降低了煤粉的燃点。利用参比DTA法直接计算出煤粉燃烧释放热量的变化。研究发现，K2CO3、Fe2O3、CaCO3和CeO2使无烟煤燃烧过程中释放的热量分别增加了340.2J/g、352.8J/g、348.6J/g和264.6J/g。以上结果与常规DTA实验结果一致，参比DTA法更加直接地说明了煤粉催化燃烧特性。Abstract: A new method of investigating catalytic combustion characteristics of pulverized coal was introduced using synthetical thermal analyzer, that is, the referenced DTA. Ignition temperatures of anthracite with K2CO3, Fe2O3, CaCO3 and CeO2 addition were 319℃, 410℃, 400℃ and 405℃ respectively determined by the referenced DTA. The ignition temperatures decreased by catalysts were observed directly from the reference DTA curves. In addition, variations of heat release during pulverized coal combustion were calculated by the referenced DTA curves. The heat releases of anthracite combustion increased by 340.2J/g, 352.8J/g, 348.6J/g and 264.6J/g, respectively, with K2CO3、Fe2O3、CaCO3 and CeO2 addition. The above results are accordance with those from conventional DTA experiment. However, the referenced DTA is more effective and direct to show catalytic combustion characteristics of pulverized coal.
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Key words:
- referenced DTA /
- catalytic combustion /
- ignition temperature /
- combustion efficiency
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