Measurement of CO_(2) adsorption capacity with respect to different pressure and temperature in sub-bituminous: implication for CO_(2) geological sequestration  

作　　者：Sijian ZHENG Shuxun SANG Shiqi LIU Meng WANG Lutong CAO Xin JIN Guangjun FENG Yi YANG 

机构地区：[1]Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization,China University of Mining and Technology,Xuzhou 221108,China [2]Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221008,China [3]School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China [4]China Coal Technology and Engineering Group Coal Mining Research Insitute,Beijing 100013,China [5]Xi'an Research Institute,China Coal Technology and Engineering Group,Xi'an 710077,China

出　　处：《Frontiers of Earth Science》2023年第3期752-759,共8页地球科学前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.42141012,41972168,and 42030810);the Peng Cheng Shang Xue Education Fund of CUMT Education Development Foundation(No.PCSX202204);the Fundamental Research Funds for the Central Universities(No.2020ZDPYZD01)a;a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

摘　　要：CCUS (carbon capture, utilization, and storage) technology is regarded as a bottom method to achieve carbon neutrality globally. CO_(2) storage in deep coal reservoirs serves as a feasible selection for CCUS, and its storage potential can be attributed to the CO_(2) adsorption capacity of the coal. In this paper, a series of CO_(2) adsorption isotherm experiments were performed at different pressures and temperatures in sub-bituminous coal from the southern Junggar Basin (reservoir temperature ∼25.9°C and pressure ∼3.91 MPa). In addition, the high-pressure CO_(2) adsorption characteristics of the southern Junggar Basin coal were characterized using a supercritical D-R adsorption model. Finally, the CO_(2) storage capacities in sub-bituminous coal under the in situ reservoir temperature and pressure were analyzed. Results indicated that the excess adsorption capacities increase gradually with increasing injection pressure before reaching an asymptotic maximum magnitude of ∼34.55 cm3/g. The supercritical D-R adsorption model is suitable for characterizing the excess/absolute CO_(2) adsorption capacity, as shown by the high correlation coefficients > 0.99. The CO_(2) adsorption capacity increases with declining temperature, indicating a negative effect of temperature on CO_(2) geological sequestration. By analyzing the statistical relationships of the D-R adsorption fitting parameters with the reservoir temperature, a CO_(2) adsorption capacity evolution model was established, which can be further used for predicting CO_(2) sequestration potential at in situ reservoir conditions. CO_(2) adsorption capacity slowly increases before reaching the critical CO_(2) density, following a rapid decrease at depths greater than ∼800 m in the southern Junngar Basin. The research results presented in this paper can provide guidance for evaluating CO_(2) storage potential in deep coal seams.

关 键 词：CCUS CO_(2)adsorption capacity pore structure CO_(2)geological sequestration Junggar Basin 

分 类 号：O64[理学—物理化学]