| Citation: |
GAO Fei，WANG Peng，SHAN Yafei. Study on the factors affecting the adsorption of CO2 from power plant flus gas in coal left in goaf area[J]. Coal Science and Technology，2023，51（9）：140−148. DOI: 10.13199/j.cnki.cst.2022-1037
|
Utilizing the adsorption characteristics of coal rock in the goaf to storage CO2 not only reduces the cost of carbon capture and separation, but also prevents spontaneous combustion of coal left in goaf area. The effects of pore structure, mineral content and moisture content on the CO2 adsorption characteristics of coal were investigated using adsorption experiments at ambient temperature and pressure, ASAP specific surface area and pore size analysis experiments. Then the quantitative relationship equations of factors affecting CO2 adsorption in coal were fitted, and the importance weights of each influence was calculated by Random Forest algorithm. The results shown that, the pore size distribution of three coals from the mining area of Dananhu (DNH), Hegang (HG) and Tongxin (TX) were basically the same. The number of pores in the range of 0.5-0.7 nm and 0.8-0.9 nm was more, and that in the range of 0.7-0.8 nm was less. The number of micropores was the fundamental reason for the difference in CO2 adsorption capacity of three coals. At ambient temperature and pressure, the saturated adsorption amount of CO2 in coal increased with the increasing specific surface area, and decreased with the increasing mineral content and moisture content. The more the number of micropores of coal, the more significant the influence of mineral content and moisture content on the adsorption amount. After the coal reached the critical moisture content, the saturated CO2 adsorption amount gradually tended to be stable because the water molecules hindered the flow channels of CO2 molecules, resulting in the CO2 molecules not being able to enter into the pores inside the coal. The specific surface area had the greatest influence on the adsorption amount, followed by the moisture content and pore volume, and the mineral content was the weakest. Specific surface area and moisture content had a combined importance weight of 75.1%, which was much higher than the other two factors. According to the fitting equation, the saturated adsorption amount of CO2 in coal can be inferred by determining the specific surface area, mineral content and moisture content of coal, which provide a theoretical basis for CO2 adsorption and storage by coal left in goaf area.
| [1] |
PIGEON,JONAS. What carbon capture and storage (CCS) is expected to ? Describing potential future of a CO2 mitigation technological system in the seine waterway axis[J]. Energy Procedia,2017,114:7333−7342. doi: 10.1016/j.egypro.2017.03.1864
|
| [2] |
ZENG Rongshu,VINCENT Ceri Jayne,TIAN Xingyou,et al. New potential carbon emission reduction enterprises in China: deep geological storage of CO2 emitted through industrial usage of coal in China[J]. Greenhouse Gases Science & Technology,2013,3(2):106−115.
|
| [3] |
MTNCHENER Andrew J. Gasification based CCS challenges and opportunities for China[J]. Fuel,2014,116(1):904−909.
|
| [4] |
ZHANG Xian,FAN Jingli,WEI Yiming. Technology roadmap study on carbon capture, utilization and storage in China[J]. Energy Policy,2013,59:536−550. doi: 10.1016/j.enpol.2013.04.005
|
| [5] |
高 飞,邓存宝,王雪峰,等. 烟气注入采空区封存的可行性与安全性分析[J]. 中国安全生产科学技术,2016,12(7):60−64.
GAO Fei,DENG Cunbao,WANG Xuefeng,et al. Analysis on feasibility and safety in sealing of smoke injected into goaf[J]. Journal of Safety Science and Technology,2016,12(7):60−64.
|
| [6] |
QU Shijie,YANG Jianli,LIU Zhenyu. CO2 sorption on coals: contribution of minerals and influence of supercritical CO2 pre-exposure[J]. Energy Fuels,2012,26(6):3928−3934. doi: 10.1021/ef300123s
|
| [7] |
WANG Xuefeng,DENG Cunbao,QIAO Ling,et al. A study on factors influencing CO2 adsorption by coal[J]. AIP Advances,2021,11(3):035238. doi: 10.1063/5.0041023
|
| [8] |
GUAN Cheng,LIU Shimin,LI Chengwu,et al. The temperature effect on the methane and CO2 adsorption capacities of Illinois coal[J]. Fuel,2018,211(1):241−250.
|
| [9] |
ZHU Hongqing,GUO Song,XIE Yuyi,et al. Molecular simulation and experimental studies on CO2 and N2 adsorption to bituminous coal[J]. Environmental Science and Pollution Research,2021,28:15673−15686. doi: 10.1007/s11356-020-11722-y
|
| [10] |
孟召平,刘珊珊,王保玉,等. 不同煤体结构煤的吸附性能及其孔隙结构特征[J]. 煤炭学报,2015,40(8):1865−1870. doi: 10.13225/j.cnki.jccs.2015.0620
MENG Zhaoping,LIU Shanshan,WANG Baoyu,et al. Adsorption capacity and its pore structure of coals with different coal body structure[J]. Journal of China Coal Society,2015,40(8):1865−1870. doi: 10.13225/j.cnki.jccs.2015.0620
|
| [11] |
谢卫东,王 猛,代旭光. 渝东南地区下志留统龙马溪组页岩吸附CO2特征及影响因素分析[J]. 河南理工大学学报(自然科学版),2018,37(6):80−88.
XIE Weidong,WANG Meng,DAI Xuguang. CO2 adsorption characteristics and its affecting factors of lower Silurian, Longmaxi formation shale in southeast Chongqing[J]. Journal of Henan Polytechnic University(Natural Science),2018,37(6):80−88.
|
| [12] |
周西华,牛玉平,白 刚,等. 煤吸附CO2体积影响因素试验研究[J]. 中国安全科学学报,2019,29(12):85−90.
ZHOU Xihua,NIU Yuping,BAI Gang,et al. Experimental study on factors affecting volume of CO2 adsorbed by coal[J]. China Safety Science Journal,2019,29(12):85−90.
|
| [13] |
DU Qiuhao,LIU Xiaoli,WANG Enzhi,et al. Effects of CO2–water interaction with coal on mineral content and pore characteristics[J]. Journal of Rock Mechanics and Geotechnical Engineering,2020,12(2):326−337. doi: 10.1016/j.jrmge.2019.07.009
|
| [14] |
GAO Fei,XIA Ji,SUN Ruijie,et al. Effects of inhibitors on the sequestration of flue gas in goaf and pore structures of coal[J]. Fuel,2022,310:122354. doi: 10.1016/j.fuel.2021.122354
|
| [15] |
ZHAO Junhong,XU Hao,TANG Dazhen,et al. A comparative evaluation of coal specific surface area by CO2 and N2 adsorption and its influence on CH4 adsorption capacity at different pore sizes[J]. Fuel,2016,183(1):420−431.
|
| [16] |
MARCIN,LUTYŃSKI,PATRYCJA,et al. CO2 sorption of Pomeranian gas bearing shales – the effect of clay minerals[J]. Energy Procedia,2017,125:457−466. doi: 10.1016/j.egypro.2017.08.153
|
| [17] |
付学祥,张登峰,降文萍,等. 煤体理化性质对其孔隙结构和甲烷吸附性能影响的研究进展[J]. 化工进展,2019,38(6):2714−2725. doi: 10.16085/j.issn.1000-6613.2018-1948
FU Xuexiang,ZHANG Dengfeng,JIANG Wenping,et al. Influence of physicochemical properties of coals on pore morphology and methane adsorption: a perspective[J]. Chemical Industry and Engineering Progress,2019,38(6):2714−2725. doi: 10.16085/j.issn.1000-6613.2018-1948
|
| [18] |
SVABOVA M,WEISHAUPTOVA Z,PRIBYL O. The effect of moisture on the sorption process of CO2 on coal[J]. Fuel,2012,92(1):187−196. doi: 10.1016/j.fuel.2011.08.030
|
| [19] |
MENG Meng,QIU Zhengsong,ZHONG Ruizhi,et al. Adsorption characteristics of supercritical CO2/CH4 on different types of coal and a machine learning approach[J]. Chemical Engineering Journal,2019,368:847−864. doi: 10.1016/j.cej.2019.03.008
|
| [20] |
朱炎铭,王 阳,陈尚斌,等. 页岩储层孔隙结构多尺度定性-定量综合表征: 以上扬子海相龙马溪组为例[J]. 地学前缘,2016,23(1):154−163.
ZHU Yanming,WANG Yang,CHEN Shangbin,et al. Qualitative-quantitative multiscale characterization of pore structures in shale reservoirs: a case study of longmaxi formation in the upper yangtze area[J]. Earth Science Frontiers,2016,23(1):154−163.
|
Supported by: Beijing Renhe Information Technology Co., Ltd. 
DownLoad: