Targeted Modification Effects of HCl Acidification on Methane Adsorption in Coal

被引:0
|
作者
Si, Nian [1 ]
Liu, Gaofeng [1 ,2 ]
Zhang, Zhen [1 ,4 ]
Zhang, Zixu [1 ,2 ]
Liu, Huan [1 ]
Lv, Runsheng [1 ,2 ]
Wang, Xiaoming [3 ]
Chang, Ping [4 ]
Barakos, George [4 ]
Lin, Jia [4 ]
机构
[1] Henan Polytech Univ, Sch Resources & Environm, Jiaozuo 454003, Peoples R China
[2] Henan Polytech Univ, Collaborat Innovat Ctr Coal Work Safety & Clean Hi, Jiaozuo 454003, Peoples R China
[3] China Univ Geosci, Key Lab Tecton & Petr Resources, Wuhan 430074, Peoples R China
[4] Curtin Univ, WA Sch Mines Minerals Energy & Chem Engn, Kalgoorlie, WA 6430, Australia
基金
中国国家自然科学基金;
关键词
LOW-RANK COAL; PORE STRUCTURE; MACROMOLECULAR STRUCTURE; GAS-ADSORPTION; ACID TREATMENT; JUNGGAR BASIN; CAPACITY; CO2; TEMPERATURE; MICROPORES;
D O I
10.1021/acs.energyfuels.4c05786
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Acidification is a commonly used chemical modification method to ameliorate the coal seam permeability. Current research on acidified coal mainly focuses on mineral composition, pore structure, and permeability. However, as one of the key stages of coalbed methane (CBM) development, there is still insufficient research on adsorption in acidified coal. The study selected HCl as the modification reagent and explored the pore and adsorption evolution characteristics through pore-combined testing technology and isothermal adsorption experiments. The results demonstrate that HCl acidification has a pore-enlarged effect on the macropore, with an increase in pore volume and a decrease in pore area. Mesopore displays pore-enlarged and transformed effect, with a decrease in pore volume and area. But HCl acidification has a weak effect on the micropore structure with chemical properties. The changes in the pore structure influence the Langmuir constant. Specifically, the decrease in macropore and mesopore area reduces the gas adsorption sites and weakens the adsorption capacity. The Langmuir constants generally show a decrease in Langmuir volume V L and an increase in Langmuir pressure P L. The study clarified the targeted control effect of HCl acidification on reducing coal adsorption and enhancing desorption efficiency and revealed the mechanism of CBM increasing production from the perspective of adsorption and desorption, which provides theoretical guidance and an evaluation basis for the HCl application in reservoir modification and CBM increasing production.
引用
收藏
页码:3495 / 3507
页数:13
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