Study on Methane Adsorption Characteristics of Different Rank Coals in Presence of Moisture

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Authors

  • State Key Laboratory of Coal Resource and Mine Safety, School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CN
  • School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CN
  • School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CN
  • School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CN
  • School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CN
  • School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CN

Keywords:

Moisture, Methane, Isothermal Adsorption, Coal Rank.

Abstract

Experiments on methane sorption of four coals from north China ranging from high-volatile bituminous to anthracite with different moisture have been carried out. The results show that the coal rank has a signi?cant impact on the absorption characteristic of the moist coal. The moisture content of coals varies with volatile mater shows a U-shape function and reaches the minimum at about 30% volatile matter under the same humidity and temperature condition. The methane adsorption isotherms of four different rank coals in the presence of moisture can be well fitted by the Langmuir model. The experimental results show that there is a critical moisture content above which the moisture has no inhibition effect on methane sorption. Furthermore, coal rank influences the critical moisture content. High rank coal usually has higher critical moisture than low rank coal. Moreover, the adsorption capacity of low rank coal reduces more by the moisture than high rank coal at the moisture content. A new empirical formula was proposed and it can well fit the data of the gas adsorption capacity of four coals with different moisture. This empirical formula explains the effect of coal rank on the adsorption capacity of moist coal from the perspective of mathematical theory.

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Published

2022-10-19

How to Cite

Wang, K., Jiang, Y., Kan, T., Liu, A., Chang, X., & Xu, G. (2022). Study on Methane Adsorption Characteristics of Different Rank Coals in Presence of Moisture. Journal of Mines, Metals and Fuels, 64(12), 585–591. Retrieved from https://informaticsjournals.com/index.php/jmmf/article/view/31617

 

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