物质对油砂热解特性的影响

Effects of minerals on the pyrolysis characteristics of oil sands

油砂的开采和提炼是解决当前能源紧缺的重要途径。采用X射线衍射技术(XRD)和热重分析仪(TGA)分别对油砂酸洗前后样品的矿物质组分及其热解特性进行了研究,结果表明:油砂内在矿物质主要为方解石、石英、黄铁矿和黏土矿物等。经HCl/HF酸洗后,能够脱除油砂大部分内在矿物质组分;油砂热解过程可分为两个阶段,即脱水阶段和热裂解阶段;采用Coast-Redfern积分法求解出了油砂热解过程主要阶段的动力学参数活化能和指前因子,发现酸洗后油砂样品的活化能有着不同程度的增加。研究结果为油砂的工业化提供了一定的理论基础。

Oil sands mining and refining is an important way to solve the current energy shortage.The mineral components and pyrolysis characteristics of oil sands,including raw and demineralized samples,were investigated using X-ray diffraction(XRD) and thermogravimetric analysis(TGA).The results show that the predominant mineral composition of oil sands,includes calcite,quartz,pyrite and clay,and a majority of minerals of oil sands,can be removed by acid method;the pyrolysis process of oil sands can be divided into two stages:dewatering stage and thermal cracking stage.The kinetic parameters,activation energy and frequency factor,of the main pyrolysis stage of oil sands were determined using Coast-Redfern integral method,and the activation energy of the pickling samples in varying degrees becomes higher than its original samples.The results provide a theoretical reference for industrializing oil sands treatment.