Experimental and Numerical Simulation of Water Adsorption and Diffusion in Coals with Inorganic Minerals

Yong Xu, Xuexi Chen, Wei Zhao and Peng Chen
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Yong Xu: School of Emergency Management and Safety Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Xuexi Chen: School of Mines Safety, North China Institute of Science & Technology, Langfang 065201, China
Wei Zhao: School of Emergency Management and Safety Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Peng Chen: School of Emergency Management and Safety Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

Energies, 2022, vol. 15, issue 12, 1-15

Abstract: The study on the adsorption and micropore filling of water vapor in coal is significant for predicting coalbed methane content in coal seams. The primary purpose of this study is to explain the effects of coal pore structure and its surface chemistry on water vapor monolayer adsorption, micropore filling, and diffusion coefficient. First, X-ray diffraction (XRD) and mercury intrusion porosimetry (MIP) analyzed inorganic mineral components of two kinds of coal samples and pore fissures structures. Then, we divide pores and fissures according to the theory of fractal dimensions. Furthermore, we carried out the water vapor adsorption and desorption experiments on two kinds of coal; in particular, we set 14 points of relative pressure between 0 and 0.2. Guggenheim–Anderson–de Boer (GAB), Frenkel–Halsey–Hill (FHH), and Freundlich models were used to analyze the data of water vapor adsorption to obtain the boundary pressure points of the monolayer, multilayer adsorption, and capillary condensation. Finally, the parameters of the models were obtained by fitting the adsorption data of water vapor according to the combined GAB, Freundlich, DA, and bidisperse adsorption (BDA) models to analyze the interaction mechanism between coal and water. We explain why the strongly adsorbed water minerals, such as pyrite, illite, and nacrite coal, can improve water vapor’s adsorption and diffusion capacity in coal pore fissures.

Keywords: water adsorption; isotherm models; monolayer-multilayer adsorption; micropore filling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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