SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (6): 818-823.DOI: 10.1016/j.cjche.2016.05.007

Previous Articles    

Multiple linear equation of pore structure and coal-oxygen diffusion on low temperature oxidation process of lignite

Xianliang Meng1,2, Mingqiang Gao1, Ruizhi Chu1, Guoguang Wu1, Qiang Fang1   

  1. 1 School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China;
    2 Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining & Technology, Xuzhou 221116, China
  • Received:2015-10-26 Revised:2016-03-31 Online:2016-07-12 Published:2016-06-28
  • Contact: Ruizhi Chu
  • Supported by:

    Supported by the National Natural Science Foundation of China (51204179, 51204182) and the Natural Science Foundation of Jiangsu Province, China (BK20141242).

Multiple linear equation of pore structure and coal-oxygen diffusion on low temperature oxidation process of lignite

Xianliang Meng1,2, Mingqiang Gao1, Ruizhi Chu1, Guoguang Wu1, Qiang Fang1   

  1. 1 School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China;
    2 Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining & Technology, Xuzhou 221116, China
  • 通讯作者: Ruizhi Chu
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51204179, 51204182) and the Natural Science Foundation of Jiangsu Province, China (BK20141242).

Abstract: This work aimed at studying the feasibility of calculating the coal-oxygen diffusion properties during the low temperature oxidation process of lignite so as to predict its spontaneous combustion process. Coal samples were oxidized in air ambient under different temperatures. Scanning Electron Microscope was used to indicate the surface morphology changes of oxidization. Then, based on fractal theory and flow characteristics, the fractal dimension of gas diffusion in the pore ways was calculated under different temperature. Considering pore size distribution, connectivity distribution and Fick diffusion mechanisms, the relationship between the gas diffusivity change with pore area fractal dimension and porosity was investigated, and multiple linear equation of the coal-oxygen diffusion coefficients and pore parameters was obtained. Comparison between the experimental data and model prediction verifies the validity of the model. The research provides a theoretical basis for the prediction model of coal-oxygen diffusion law.

Key words: Coal spontaneous combustion, Oxidation, Pore structure, Diffusion

摘要: This work aimed at studying the feasibility of calculating the coal-oxygen diffusion properties during the low temperature oxidation process of lignite so as to predict its spontaneous combustion process. Coal samples were oxidized in air ambient under different temperatures. Scanning Electron Microscope was used to indicate the surface morphology changes of oxidization. Then, based on fractal theory and flow characteristics, the fractal dimension of gas diffusion in the pore ways was calculated under different temperature. Considering pore size distribution, connectivity distribution and Fick diffusion mechanisms, the relationship between the gas diffusivity change with pore area fractal dimension and porosity was investigated, and multiple linear equation of the coal-oxygen diffusion coefficients and pore parameters was obtained. Comparison between the experimental data and model prediction verifies the validity of the model. The research provides a theoretical basis for the prediction model of coal-oxygen diffusion law.

关键词: Coal spontaneous combustion, Oxidation, Pore structure, Diffusion