摘要
“碳达峰、碳中和”目标是中国维护全球生态安全的大国责任担当,也是实现高质量发展和生态文明建设的重要途径,CO_(2)减排势在必行。“相对富煤、贫油、少气”的能源资源禀赋格局导致中国主体能源仍以碳排放强度较高的煤炭为主,煤炭作为电力、钢铁、煤化工等高耗能行业的重要能源与原料,在“双碳”目标实现过程中占有重要地位,煤炭工业通过低碳转型实现碳达峰,既是煤炭工业高质量发展的内在要求,也是落实国家“双碳”战略目标的重要抓手。相对于传统天然矿化原料,煤基固废矿化封存CO_(2)具有原料丰富、产物友好、能耗较低、反应迅速等优点,同时可以产出高附加值产物用于化工、建筑等领域,受到了广泛的关注。介绍了我国主要煤基固废煤矸石、粉煤灰、脱硫石膏、气化渣、炉底渣的特点,分析了我国主要CO_(2)排放源及产生量;回顾了按照矿化封存位置不同的原位和非原位CO_(2)矿化技术及按照矿化机理不同的直接碳酸化和间接碳酸化技术;综述了以煤基固废作为原料进行CO_(2)矿化封存技术的研究进展,发现该技术反应条件苛刻,成本较高,处理规模小,研究尚停留在实验室阶段;简述了以煤基固废作为载体,利用采空区作为储源矿化封存CO_(2)技术,主要包括构筑功能性充填体及制备负碳型充填材料2种技术;分析了煤基固废矿化封存CO_(2)现存问题及未来研究方向。煤基固废为原料的CO_(2)矿化技术,未来应优化工艺流程,降低反应成本,进一步加强工业化推广的研究;针对以煤基固废作为载体,利用采空区作为储源的CO_(2)矿化封存技术,未来应加强对深度矿化机理、封存风险评价及长期稳定性的研究,提高CO_(2)封存规模和长期稳定性。在此基础上,利用煤基固废制备浆体充填材料,以水为载体,以泵为动力,以管路为通道,将充填材料及CO_(2)输送至采空区进行矿化反应,同时结合微生物诱导碳酸钙沉淀(MICP)技术,封闭岩体采动裂隙,实现CO_(2)矿化封存。
The goal of“carbon peak and carbon neutrality”is China’s responsibility as a major country to maintain global ecological security,and it is also an important way to achieve high-quality development and ecological civilization construction.CO_(2) emission reduction is imperative.As a result of the energy resource endowment pattern of“rich in coal,poor in oil and less gas”,the main energy in China is still coal with high carbon emission intensity.Coal is an important energy and raw material for high energy-consuming industries such as electric power,iron and steel and coal chemical industry.it plays an important role in the process of achieving the goal of“double carbon”.The coal industry achieves carbon peak through low-carbon transformation,which is the inherent requirement of the high-quality development of coal industry.It is also an important starting point for the implementation of the national“double carbon”strategic goal.Compared with the traditional natural mineralization raw materials,coal-based solid waste mineralization and storage CO_(2) has the advantages of rich raw materials,friendly products,low energy consumption and rapid reaction.At the same time,it can produce high value-added products for chemical industry,construction and other fields.The characteristics of main coal-based solid waste coal gangue,fly ash,desulphurization gypsum,gasification slag and furnace bottom slag in China are introduced,the main CO_(2) emission sources and production in China are analyzed,and the in-situ and ex-situ CO_(2) mineralization technologies according to different mineralization and storage locations and direct and indirect carbonation technologies according to mineralization mechanism are reviewed.The research progress of CO_(2) mineralization and storage technology using coal-based solid waste as raw material is reviewed,and it is found that this technology has harsh reaction conditions,high cost,small treatment scale,and the research is still in the laboratory stage.This paper briefly describes the mineralization and storage technology of CO_(2) with coal-based solid waste as carrier and goaf as storage source,which mainly includes two technologies:construction of functional filling body and preparation of negative carbon filling material.The existing problems and future research direction of coal-based solid waste mineralization and storage of CO_(2) are analyzed.For the CO_(2) mineralization technology with coal-based solid waste as raw material,the technological process should be optimized,the reaction cost should be reduced,and the research on industrialization promotion should be further strengthened.aiming at the CO_(2) mineralization and storage technology with coal-based solid waste as carrier and goaf as storage source,the research on deep mineralization mechanism,storage risk assessment and long-term stability should be strengthened in the future,so as to improve the storage scale and long-term stability of CO_(2).On this basis,the slurry filling material is prepared from coal-based solid waste,with water as carrier,pump as power and pipeline as channel,the filling material and CO_(2) are transported to the goaf for mineralization reaction,and combined with microbial induced calcium carbonate precipitation(MICP)technology,the mining fissures in rock mass are closed to realize CO_(2) mineralization and storage.
作者
朱磊
古文哲
宋天奇
何志伟
刘治成
ZHU Lei;GU Wenzhe;SONG Tianqi;HE Zhiwei;LIU Zhicheng(China coal Research Institute Co,Ltd.,Xi’an 710054,China;School of Energy and Mining Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China)
出处
《煤炭科学技术》
EI
CAS
CSCD
北大核心
2024年第2期309-328,共20页
Coal Science and Technology
基金
中煤集团重大科技专项资助项目(ZMYXM*JT-22-02)。
关键词
“双碳”目标
碳排放
煤基固废
矿化封存
源头减排
“double carbon”target
carbon emission
coal-based solid waste
mineralization and storage
source emission reduction
