山西浑源烛煤富氧低温热解气态烃解析动力学

KINETIC STUDY ON GASEOUS HYDROCARBONS RELEASE OF SHANXI HUNYUAN CANNEL COAL DURING LOW TEMPERATURE PYROLYSIS PROCESS IN O_2-ENRICHED CONDITIONS

利用煤低温氧化实验系统,研究了在温度为293K～673K,空气流量为100mL/min和程序升温速率为3K/min的条件下,山西浑源烛煤发生热解时C1～C4低分子有机烃的临界解析温度Tm,解析速率ψ和解析表观活化能Ea.结果表明,CH4,C2H6,C2H4,C3H8,C3H6,i-C4H10和n-C4H107种有机烃的Tm为:473K,521K,433K,526K,498K,503K和529K;lnψ与1/T之间满足直线关系,符合典型的ArrheniusSA动力学特征;其Ea为28.492kJ/mol,13.506kJ/mol,28.096kJ/mol,41.786kJ/mol,68.489kJ/mol,76.763kJ/mol和73.287kJ/mol.7种有机烃的Tm,ψ和Ea具有不同的变化特征,根据这些特征,可用来预测煤的富氧低温热解特征及其自燃倾向性.

It will provide a theoretical suggestion for preventing the coal spontaneous combustion to investigate the low temperature pyrolysis characteristics of coal in O2-enriched con- ditions. The gas release critical temperatures Tm, the gas release rates ψ and the gas release ap- parent activation energies E, of seven C1-C4 low-weight molecular hydrocarbons for Shanxi Hun- yuan cannel coal under the temperature range of 293 K-673 K and the air-supply flow rate of 100mL/min were investigated by using a coal self-heating experimental facility. The results show that the gas release critical temperatures Tm for CH4, C2 H6, C2 H4, C3 H8, C3 H6, i-C4 H10 and n- C4H10 were 473 K,491 K,423 K,513 K,490 K,503 K and 523 K respectively. The logarithmic re- lease rates of hydrocarbons （Inch） were linearly correlated with the reciprocal of absolute tempera- ture （l/T）, which were consistent with typical Arrhenius S A kinetic characteristics. The appar- ent activation energies were 28. 492 kJ/mol, 13. 506 kJ/mol, 28. 096 kJ/mol, 41. 786 kJ/mol, 68. 489 kJ/mol,76. 763 kJ/mol and 73. 287 kJ/mol respectively. Tm ,ψ and E, for seven gaseous hy- drocarbons demonstrated different characteristics, which will be useful for predicting the low temperature pyrolysis characteristics of coal in O2-enriched conditions and the property to coal spontaneous combustion.