李素芬

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:女

毕业院校:大连理工大学

学位:硕士

所在单位:能源与动力学院

办公地点:能源与动力学院718室

联系方式:13084159090

电子邮箱:lisuf@dlut.edu.cn

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Simulation of the evolution of pressure in a lignite particle during pyrolysis

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论文类型:会议论文

发表时间:2014-03-24

收录刊物:EI、Scopus

页面范围:666-679

摘要:Evolution of pressure in a lignite particle during pyrolysis was simulated based on the gas motion equation in porous media and considering the Klinkenberg effect. The CPD model was used to describe pyrolysis. The pore diameter in the particle is close to the average free path of volatile gas molecules, so the solid phase restrains the movement of gas. Since flow out of the particle is restricted, the internal pressure rises. The internal pressure first increases and then decreases during pyrolysis, and the evolution is influenced by heating conditions. The pressure rise is larger at a higher heating rate, but the duration of the pressure peak is shorter. The total pressure in the particle is larger at a higher ambient pressure, but the pressure difference between the inside and the surrounding decreases with the increasing ambient pressure. Growing internal pressure can restrain tar gasification, which can lead to the increase of the metaplast content and the decline of tar yield.