凝结热对低阶煤低温氧化过程的影响
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摘要: 选用Pulse Calorimeter仪器，研究了低阶煤在干燥氧气下低温氧化过程的反应热和相对湿度为80％的氮气下凝结热与温度的变化，以研究凝结热对低阶煤低温氧化过程的影响。结果表明,随着温度的上升体系的反应热增加，而凝结热减少。在26℃~60℃的低温下，体系的凝结热明显高于反应热。因此，低温下凝结热是影响低阶煤的低温氧化过程的重要因素。研究还得到了低阶煤在干燥氧气下低温氧化过程的动力学方程及活化能。Abstract: The heat of oxygen reaction of low rank coals during low temperature oxidation under dry oxygen is measured using pulse calorimeter. The relation between the condensation heat and temperature at low temperature is investigated under wet nitrogen with relative humidity of 80% in order to study the effect of condensation heat on the low temperature oxidation of low rank coal. The results indicate that the heat of oxygen reaction increase with temperature under dry oxygen, but condensation heat decrease with temperature under wet nitrogen. Both kinetic equation of Arrhenius and activation energy are obtained under dry oxygen. It is also found that the condensation heat is much higher than the heat of oxygen reaction when the range of temperature is from 26℃ to 60℃. Therefore, the condensation heat is a key factor affecting the reaction of oxidation of low rank coal at low temperature.
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Key words:
- low rank coals /
- low temperature oxidation /
- condensation heat
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