颗粒粒径对油页岩热解产油率的影响

以桦甸油页岩为原料研究了颗粒粒径对油页岩热解产油率的影响。将油页岩破碎、筛分得到<0.074、0.074~0.125、0.125~0.25、0.25~0.5、0.5~1和1~3 mm不同粒级样品,再将0.25~0.5、0.5~1和1~3 mm大粒级样品粉碎制得对应的细粉样品,采用低温干馏法和热重分析分别测定表征样品的油产率和有机质含量。结果表明,油产率随着粒径减小逐渐降低,从1~3 mm下的11.92%降到<0.074 mm下的6.14%。热重分析表明,有机质含量随着粒径降低而降低,且油产率与有机质含量有明显的线性关系。0.25~0.5、0.5~1和1~3 mm样品经粉碎后油产率降低、气产率升高,但变化值均小于1%。在破碎过程中有机质选择性地富集在大粒级样品中,且页岩油二次反应程度随着粒径的减小而增大,使得页岩油产率随着粒径的降低而降低,且有机质选择性富集是主导因素。

Influence of particle size on oil yield from pyrolysis of oil shale

The influence of particle size on oil yield from pyrolysis of Huadian oil shale was investigated. The raw material was crushed and sieved to 6 fractions with different particle size: <0.074, 0.074~0.125, 0.125~0.25, 0.25~0.5, 0.5~1 and 1~3 mm. Then, the fraction of 0.25~0.5, 0.5~1 and 1~3 mm were ground to obtain the corresponding powder samples. A standard method and thermogravimetric analysis were applied to measure and characterize the oil yield and organic matter content in different samples. The results show that both the oil yield (from 11.92% to 6.14%) and organic matter content decrease gradually with decrease in particle size, and a significantly linear relationship is observed between oil yield and organic matter content. The oil yield for powder sample of 0.25~0.5, 0.5~1, and 1~3 mm decreases, while gas yield increases, but the variation is slight and below 1%. Both preferential distribution of organic matter and secondary reaction of shale oil determine the oil yield of fractions with different particle sizes. Furthermore, the selective enrichment of organic matter is the predominant factor.