WANG Tian, SANG Shuxun, LIU Shiqi, DU Yi. Experiment study on the chemical structure changes of different rank coals under action of supercritical carbon dioxide and water[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 60-65. DOI: 10.3969/j.issn.1001-1986.2018.05.010
Citation: WANG Tian, SANG Shuxun, LIU Shiqi, DU Yi. Experiment study on the chemical structure changes of different rank coals under action of supercritical carbon dioxide and water[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 60-65. DOI: 10.3969/j.issn.1001-1986.2018.05.010

Experiment study on the chemical structure changes of different rank coals under action of supercritical carbon dioxide and water

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National Natural Science Foundation of China(41330638)

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  • Received Date: June 04, 2018
  • Published Date: October 24, 2018
  • ScCO2-H2O-coal geochemical reaction can exert a great influence on the physical and chemical structure of coal, playing a critical role in the CO2 injection and enhancing CH4 recovery. To investigate the effects of ScCO2-H2O on chemical structure in coal, three coal samples of different metamorphic grades were exposed to supercritical CO2 and deionized water under 1000m depth temperature and pressure conditions for 240h using a high pressure reactor(ScCO2/H2O simulation system and coal/rock geochemical reaction device). X-ray diffraction and Raman spectroscopy were used to provide change characteristics of crystal structure and carbon order degree of coal before and after the ScCO2-H2O treatment. The results show that the ScCO2-H2O reaction destroys the crystal structural integrity and carbon order degree and changes the macromolecular structure of coal, the effect mainly depends on the coal rank, i.e., for low rank coals, the degree of parallel orientation increases and makes its structure more compact, the lamellae spacing decreases; while for medium-high rank coals, the disordered structure and lamellae spacing of the coal microcrystalline structure increases. This study result has laid a micro-scale foundation for the adsorption/desorption, pore and permeability characterization of coal reservoir before and after ScCO2-H2O action in the implementation of the CO2-ECBM project.
  • [1]
    李辛子,王运海,姜昭琛,等. 深部煤层气勘探开发进展与研究[J]. 煤炭学报,2016,41(1):24-31.

    LI Xinzi,WANG Yunhai,JIANG Zhaochen,et al. Progress and study on exploration and production for deep coalbed methane[J]. Journal of China Coal Society,2016,41(1):24-31.
    [2]
    MAZUMDER S,van HEMERT P,BRUINING J,et al. In situ CO2-coal reactions in view of carbon dioxide storage in deep unminable coal seams[J]. Fuel,2006,85(12/13):1904-1912.
    [3]
    ANDRE L,AUDIGANE P,AZAROUAL M,et al. Numerical modeling of fluid-rock chemical interactions at the supercritical CO2-liquid interface during CO2 injection into a carbonate reservoir,the Dogger aquifer(Paris basin,France)[J]. Energy Conversion and Management,2007,48(6):1782-1797.
    [4]
    DU Yi,SANG Shuxun,WANG Wenfeng,et al. Experimental study of the reactions of supercritical CO2 and minerals in high-rank coal under formation conditions[J]. Energy & Fuels, 2018,32(2):1115-1125.
    [5]
    LIU Shiqi,MA Jingsheng,SANG Shuxun,et al. The effects of supercritical CO2 on mesopore and macropore structure in bituminous and anthracite coal[J]. Fuel,2018,223:32-43.
    [6]
    LIN Hongfei,TAKASHI F,TAKISAWA R,et al. Experimental evaluation of interactions in supercritical CO2/water/rock minerals system under geologic CO2 sequestration conditions[J]. Journal of Materials Science,2008,43(7):2307-2315.
    [7]
    DAWSON G K W,GOLDING S D,MASSAROTTO P,et al. Experimental supercritical CO2 and water interactions with coal under simulated in situ conditions[J]. Energy Procedia,2011,4:3139-3146.
    [8]
    ZHANG Kaizhong,CHENG Yuanping,LI Wei,et al. Influence of supercritical CO2 on pore structure and functional groups of coal:Implications for CO2 sequestration[J]. Journal of Natural Gas Science and Engineering,2017,40:288-298.
    [9]
    郝志勇,岳立新,孙可明,等. 超临界CO2温变对低渗透煤层孔渗变化的实验研究[J]. 煤田地质与勘探,2018,46(3):64-71.

    HAO Zhiyong,YUE Lixin,SUN Keming,et al. Experiment study on the porosity and permeability of low permeability coal by supercritical CO2 temperature variation[J]. Coal Geology & Exploration,2018,46(3):64-71.
    [10]
    HEDGES S W,SOONG Y,JONES J R M,et al. Exploratory study of some potential environmental impacts of CO2 sequestra-tion in unmineable coal seams[J]. International Journal of Environment and Pollution,2007,29(4):457-473.
    [11]
    LIU C J,WANG G X,SANG S X,et al. Changes in pore structure of anthracite coal associated with CO2 sequestration process[J]. Fuel,2010,89(10):2665-2672.
    [12]
    MASSAROTTO P,GOLDING S D,BAE J S,et al. Changes in reservoir properties from injection of supercritical CO2 into coal seams:A laboratory study[J]. International Journal of Coal Geology,2010,82(3/4):269-279.
    [13]
    陈润,秦勇. 超临界CO2与煤中矿物的流固耦合及其地质意义[J]. 煤炭科学技术,2012,40(10):17-21.

    CHEN Run,QIN Yong. Fluid-solid coupling between supercritical CO2 and minnerals in coal and geological significances[J]. Coal Science and Technology,2012,40(10):17-21.
    [14]
    DAWSON G K W,GOLDING S D,BIDDLE D,et al. Mobilisation of elements from coal due to batch reactor experiments with CO2 and water at 40℃ and 9.5 MPa[J]. International Journal of Coal Geology,2015,140:63-70.
    [15]
    姜仁霞,于洪观,王力. 基于煤层封存CO2的煤中有机质超临界CO2萃取试验装置的建立[J]. 煤炭学报,2016,41(3):680-686.

    JIANG Renxia,YU Hongguan,WANG Li. Development of an apparatus for the supercritical CO2 extraction on CO2 sequestration in coal seams[J]. Journal of China Coal Society,2016, 41(3):680-686.
    [16]
    SONIBARE O O,HAEGER T,FOLEY S F. Structural characterization of Nigerian coals by X-ray diffraction,Raman and FTIR spectroscopy[J]. Energy,2010,35(12):5347-5353.
    [17]
    WU Dun,LIU Guijian,SUN Ruoyu,et al. Influences of magmatic intrusion on the macromolecular and pore structures of coal:Evidences from Raman spectroscopy and atomic force microscopy[J]. Fuel,2014,119:191-201.
    [18]
    GUEDES A,VALENTIM B,PRIETO A C,et al. Micro-Raman spectroscopy of collotelinite,fusinite and macrinite[J]. International Journal of Coal Geology,2010,83(4):415-422.
    [19]
    李霞,曾凡桂,王威,等. 低中煤级煤结构演化的拉曼光谱表征[J]. 煤炭学报,2016,41(9):2298-2304.

    LI Xia,ZENG Fangui,WANG Wei,et al. Raman characterization of structural evolution in the low-middle rank coals[J]. Journal of China Coal Society,2016,41(9):2298-2304.
    [20]
    MARQUES M,SUAREZ-RUIZ S,FLORES D,et al. Correlation between optical,chemical and micro-structural parameters of high-rank coals and graphite[J]. International Journal of Coal Geology,2009,77(3/4):377-382.
    [21]
    KELEMEN S R,FANG H L. Maturity trends in Raman spectra from kerogen and coal[J]. Energy & Fuels,2001,15(3):653-658.
    [22]
    尹艳山,张轶,陈厚涛,等. 高灰煤中矿物质及碳结构的振动光谱研究[J]. 燃料化学学报,2015,43(10):1167-1175.

    YIN Yanshan,ZHANG Yi,CHEN Houtao,et al. Characterization of mineral matters and carbonaceous structure of high-ash coals by vibrational spectroscopy[J]. Journal of Fuel Chemistry and Technology,2015,43(10):1167-1175.
    [23]
    GATHITU B B,CHEN W Y,MCCLURE M. Effects of coal interaction with supercritical CO2 physical structure[J]. Industrial & Engineering Chemistry Research,2009,48(10):5024-5034.

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