电厂烟气注气压力对煤层吸附态瓦斯解吸效率的影响

doi:10.16265/j.cnki.issn1003-3033.2025.05.1581

中国安全科学学报 ›› 2025, Vol. 35 ›› Issue (5): 91-98.doi: 10.16265/j.cnki.issn1003-3033.2025.05.1581

电厂烟气注气压力对煤层吸附态瓦斯解吸效率的影响

白刚¹^,²^,³(), 张海晶², 苏俊¹, 梁晗², 张潇文¹, 刘正东⁴

¹ 辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛 125105
² 辽宁工程技术大学矿业学院,辽宁阜新 123000
³ 辽宁工程技术大学鄂尔多斯研究院,内蒙古鄂尔多斯 017004
⁴ 东北大学资源与土木工程学院,辽宁沈阳 110819

收稿日期:2024-12-10 修回日期:2025-02-16 出版日期:2025-05-28
作者简介:
白刚 (1991—),男,安徽灵璧人,博士,教授,博士生导师,主要从事矿井瓦斯与火灾防治等方面的研究。E-mail: baigang_1992@163.com。
白刚, 教授
梁晗, 讲师
张潇文, 讲师
刘正东, 副教授
基金资助:
国家自然科学基金资助(52274204); 中国科协青年人才托举工程项目(2022QNRC001); 辽宁省自然科学基金优秀青年基金资助(2024JH3/10200042)

Influence law of power plant flue gas injection pressure on desorption efficiency of adsorbed state gas in coal beds

BAI Gang¹^,²^,³(), ZHANG Haijing², SU Jun¹, LIANG Han², ZHANG Xiaowen¹, LIU Zhengdong⁴

¹ College of Safety Science & Engineering, Liaoning Technical University, Huludao Liaoning 125105, China
² College of Mining, Liaoning Technical University, Fuxin Liaoning 123000, China
³ Ordos Research Institute, Liaoning Technical University, Ordos Inner Mongolia 017004, China
⁴ School of Resources and Civil Engineering, Northeastern University, Shenyang Liaoning 110819, China

Received:2024-12-10 Revised:2025-02-16 Published:2025-05-28

摘要/Abstract

摘要：

为探究电厂烟气注气压力对煤层吸附态瓦斯解吸效率的影响特性,采用核磁共振(NMR)技术定量研究不同电厂烟气注气压力下煤层CH₄竞争吸附的动态变化过程,得到烟气注气压力对甲烷解吸量、解吸效率和单位时间回收效率的影响特征。试验结果表明:无烟煤吸附CH₄时,T₂谱呈现双峰特征,随着时间增加,吸附态CH₄的T₂谱峰值增加,游离态CH₄的T₂谱峰值降低,随着时间增加,煤对CH₄的吸附速率变缓;电厂烟气与煤中CH₄竞争吸附过程中,T₂谱呈现3峰特征,随着时间推移,吸附态CH₄的T₂谱峰降低,游离态CH₄的T₂谱峰增加,吸附态、游离态T₂谱积分与吸附时间呈现指数函数变化,与电厂烟气注气压力呈现线性函数变化;电厂烟气注气压力与CH₄解吸效率呈现线性增长,其中,注3.5 MPa电厂烟气较1.5 MPa对样品罐中煤样吸附CH₄的总解吸量增加0.016 mol,单位时间回收效率提高3.440%,总解吸效率提升20.631%。

关键词: 电厂烟气, 注气压力, 吸附态瓦斯, 解吸效率, 核磁共振(NMR), 竞争吸附

Abstract:

In order to explore the effect of gas injection pressure of power plant on the adsorption gas desorption efficiency of coal seam, NMR technology was used to quantitatively study the dynamic change process of CH₄ competitive adsorption under different gas injection pressure of power plant. The influence law of gas injection pressure on methane desorption, desorption efficiency and unit time recovery efficiency was obtained. The experimental results show that when anthracite coal adsorbs CH₄, the T₂ spectrum shows a bimodal characteristic. As time increases, the peak of T₂ spectrum of adsorbed CH₄ increases, while the peak of T₂ spectrum of free CH₄ decreases. With the increase of time, the adsorption rate of CH₄ by coal slows down. During the competitive adsorption process of power plant flue gas and CH₄ from coal, the T₂ spectrum exhibits three-peaks characteristics. As time progresses, the T₂ spectrum peaks of adsorbed CH₄ decreases, while the T₂ spectrum peaks of free CH₄ increases. The integrals of adsorbed and free T₂ spectra show an exponential function with the adsorption time, and a linear function with the pressure of flue gas injection in the power plant. The power plant flue gas injection pressure shows a linear increase with CH₄ desorption efficiency. The injection of 3.5 MPa power plant flue gas increases the total desorption of adsorbed CH₄ from coal samples in the sample tank by 0.016 mol, enhances the recovery efficiency per unit time by 3.440%, and increases the total desorption efficiency by 20.631%, compared to 1.5 MPa.

Key words: power plant flue gas, injection pressure, adsorbed gas, desorption efficiency, nuclear magnetic resonance(NMR), competitive adsorption

中图分类号:

X936

白刚, 张海晶, 苏俊, 梁晗, 张潇文, 刘正东. 电厂烟气注气压力对煤层吸附态瓦斯解吸效率的影响[J]. 中国安全科学学报, 2025, 35(5): 91-98.

BAI Gang, ZHANG Haijing, SU Jun, LIANG Han, ZHANG Xiaowen, LIU Zhengdong. Influence law of power plant flue gas injection pressure on desorption efficiency of adsorbed state gas in coal beds[J]. China Safety Science Journal, 2025, 35(5): 91-98.

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电厂烟气注气压力对煤层吸附态瓦斯解吸效率的影响

Influence law of power plant flue gas injection pressure on desorption efficiency of adsorbed state gas in coal beds

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