硝酸酸化对煤体瓦斯解吸特征的影响

doi:10.19286/j.cnki.cci.2025.11.020

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Abstract

In this paper, aiming at the difficulty of gas extraction in low permeability coal seam in China, the influence of nitric acid acidification technology on gas desorption characteristics of coal body is studied. Taking lignite in Qinshui Basin as a sample, through different concentrations of nitric acid acidification treatment, combined with gas isothermal desorption experiment and initial velocity test, the influence mechanism of acidification on gas desorption amount, desorption rate and initial velocity was systematically analyzed. The results show that nitric acid acidification can dissolve the mineral impurities in the pores and fissures of coal and improve the pore connectivity. Under the same adsorption pressure, the cumulative gas desorption amount of coal samples after acidification increases with the increase of nitric acid concentration. The initial desorption rate of acidified coal samples increased significantly, and the desorption rate increased with the increase of nitric acid concentration. Acidification reduces the initial velocity of gas emission Δp, indicating that acidification may inhibit the initial rapid release of gas by increasing the complexity of pore structure. This study provides a theoretical basis for the application of nitric acid acidification technology in coal seam permeability enhancement and gas efficient extraction.

Key words： nitric acid acidification gas desorption gas desorption amount desorption rate initial diffusion velocity

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	Articles by authors
	Li Pengfeng 1
	Li Bin 2
	Jiang Lijin 3

Cite this article:

Li Pengfeng 1,Li Bin 2,Jiang Lijin 3. Effect of nitric acid acidification on gas desorption characteristics of coal[J]. CCI, 2025, 48(11): 100-104，110..

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http://www.mtyhg.com.cn/EN/10.19286/j.cnki.cci.2025.11.020 OR http://www.mtyhg.com.cn/EN/Y2025/V48/I11/100

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