兴隆庄煤显微组份热解失重及热解反应动力学的研究

WEIGHT LOSS DETERMINATION AND PYROLYTIC KINETICS STUDY OF XING-LONG-ZHUANG COAL MACERALS

通过测定兴隆庄煤显微组份富集物WF、JF、BJF、SF的热解失重,研究了各显微组份热解失重特性。各显微组份富集物的失重曲线具有相似的形式,失重速率随温度的变化近似地呈高斯分布状,主要分解范围在380—540℃之间。由SF→BJF→JF→WF,热解总失重量和最大失重速率增高,微分曲线峰半宽增大。提高升温速度,热分解范围增宽,脱除挥发份产率增大。升温速度对不同显微组份富集物的影响程度不同,对SF影响最大,JF次之,WF最小。应用失重结果,借助解线性方程组的方法,计算出纯显微组份的失重数据,从而探讨了各显微组份的热解动力学,首次得到了兴隆庄煤各显微组份的热解活化能:镜质组为151.40kJ/mol,半镜质组为120.72kJ/mol,丝质组为116.45kJ/mol,稳定组为141.16kJ/mol。

Pyrolysis of macerals was studied by means of weight loss detrmination of four maceral concentrates:WF, JF, BJF, SF which were separated from Xinglongzhuang coal. The weight loss curves of the concentrates were found to to be similar. The plots of weight loss rate versus temperature showed the form of Gaussian distribution. The maia pyrolytic reaction takes place between 380-540℃. With the order of SF, BJF,JF,WF,both total weight loss and maximum weight loss rate increase, the half peak width become wider as well. With increasing heating rate, the temperature range of pyrolytic reaction enlarged and the evolved volatile matter increased. The SF is the most influenced by heating rate, JF is less influenced and WF is the least.The weight loss of pure macerals can be calculated from the weight loss curves of maceral concentrates by solving the simultanous linear equetions. Consequently, the pyrolytic kinetics f four macerals was explored.The activation energy of pyrolysis has been obtained as follows:151 kJ/mol for vitrinite, 121 kJ/mol for semi-vitrinite, 116 kJ/mol for fusinite and 141 kJ/mol for exinite.