A study on factors influencing CO2 adsorption by coal

Xuefeng Wang,Yanlei Kang,Cunbao Deng,Rui Jing,Ling Qiao,Ge Chu

doi:10.1063/5.0041023

Xuefeng Wang, Yanlei Kang + Show 4 more

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https://doi.org/10.1063/5.0041023

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Abstract

The effects of moisture, pH value, and coal rank on adsorption of CO2 by coal were studied using a self-made small sample coal adsorption device. Coal of different ranks was dried, acidified, and alkalized. CO2 gas (16%) was injected into the device at normal temperature and pressure. The results showed that the moisture and pH value in the environment and the coal rank had an influence on the CO2 adsorption capacity of coal. The saturation adsorption capacity of CO2 of acid-treated coal and alkaline-treated coal increased by 3.342%–4.255% and 0.808%–2.22%, respectively, compared to dry coal. The saturated adsorption capacity of CO2 of untreated coal was reduced by 2.176%–2.521% compared to the dry sample. According to experimental data, the existence of moisture inhibited the adsorption of CO2 by coal, and the increase or decrease in the pH value promotes the adsorption of CO2 by coal. The decrease in the pH value had the greatest influence on the adsorption of CO2 by coal. The higher coal rank resulted in the increased saturated adsorption capacity of CO2.

Highlights

Spontaneous combustion of coal burns valuable resources and causes environmental pollution
Influence of coal rank on CO2 adsorption by coal According to the data in Table I and Fig. 2, the saturated adsorption capacities of lignite, bituminous coal, and anthracite are 1.034, 1.051, and 1.0683 ml/g, respectively, which indicates that the saturated adsorption capacity of CO2 increases with the coal rank
Through the real-time observation under different experimental conditions, the following conclusions were obtained: (1) The adsorption experiments of single-component CO2 were performed with untreated bituminous coal, anthracite, and lignite, and the results showed that the CO2 adsorption capacity of coal samples increases with time

Summary

Introduction

Spontaneous combustion of coal burns valuable resources and causes environmental pollution. The methods to prevent and control spontaneous combustion of coal include pressure plugging, grouting, inert gas injection, spraying inhibition, three foam, and gel fire prevention, but many of these technologies are limited by environmental pollution, coal quality, and coal composition. Commonly used CO2 treatment methods in flue gas treatment include membrane separation technology, pressure swing adsorption technology, alkanolamine solution chemical absorption process, and lowtemperature methanol absorption technology.. Researchers have obtained the change law of the adsorption amount of supercritical CO2 under high temperature and high pressure and the adsorption–desorption process of CH4 and CO2 gases by coal.. Many scholars have focused their attention on injecting the power plant flue gas into the goaf, to study the possibility of increasing the storage of CO2 in the coal seam of the goaf.. Many scholars have focused their attention on injecting the power plant flue gas into the goaf, to study the possibility of increasing the storage of CO2 in the coal seam of the goaf. Experimental studies have shown many factors that affect the CO2 adsorption capacity of coal

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