CO2捕集、利用及封存技术研究进展

Research progress of CO2 capture, utilization and storage technology

  • 摘要: 随着化石燃料的大量使用,大气中CO2含量不断上升,加剧了全球气候变暖问题。为实现《巴黎协定》的温控目标,CO2捕集、利用与封存(CCUS)技术已成为减碳的关键途径之一。采用综合分析方法,结合理论探讨和实际项目案例,对CCUS技术优缺点及项目发展现状进行了深入分析。首先,全面概述了化学吸收法、物理吸收法、吸附法、膜分离法和低温蒸馏法等CO2捕集技术的最新进展,并详细介绍了CO2物理利用、CO2生物利用、CO2地质利用/封存和CO2化学利用等多种CO2利用及封存技术,分析了这些技术的应用前景。其次,结合中国能源结构特点,重点分析了中国在火电、煤化工、石油化工、冶金和建材等行业中CCUS项目的布局、技术路径及实施情况,以及面临的技术挑战和发展需求。尽管CCUS技术在中国已有广泛应用,但仍存在成本高、技术成熟度不足等问题,因此加强CCUS技术的研究开发和推进化石燃料使用行业的CCUS全链条项目建设显得尤为重要。未来,开发高效、低能耗、无毒无腐蚀性的捕集溶剂和系统是CO2捕集技术发展的核心,而生产高附加值化学产品和CO2安全永久性封存将是CO2利用/封存技术发展的重要方向。通过对CO2的多种利用及封存技术进行对比分析,发现CO2矿化利用/封存技术优势突出。作为一种高效且安全的永久性CO2封存解决方案,其不仅能够大规模转化碱性固体废弃物,还能为建筑行业提供原材料,实现建筑废弃物的循环再利用。该技术的就地减排特性,可有效解决CO2排放地与消费地之间的供需不匹配问题,使碳消费地有碳可用而碳源地就地利用。在适合采用CO2矿化利用/封存技术的地址建设CO2捕集−利用−封存联合运行系统,可以降低整个产业链的运行成本,推动CO2捕集−利用−封存全链条产业的发展,带来显著的环境效益和经济效益。展望未来,我国在调整能源结构的同时,应加大对相关行业的CCUS改造或建设力度,特别是全链条CCUS项目的实施,以实现有效碳封存。CO2矿化利用/封存技术作为一种高效高可靠性的CO2永久封存技术,将成为未来减排和利用CO2的重要方法之一,展现出巨大的发展潜力。

     

    Abstract: With the extensive use of fossil fuels, the concentration of CO2 in the atmosphere continues to rise, exacerbating the issue of global climate warming. To achieve the temperature control targets of the Paris Agreement, Carbon Capture, Utilization, and Storage (CCUS) technology has become one of the key pathways to reduce carbon emissions. A comprehensive analysis method is adopted, combining theoretical discussions and actual project cases, to conduct an in-depth analysis of the advantages and disadvantages of CCUS technology and the current status of project development. Firstly, it provides a comprehensive overview of the latest advancements in CO2 capture technologies such as chemical absorption, physical absorption, adsorption, membrane separation, and low-temperature distillation. Various CO2 utilization and storage technologies, including CO2 physical utilization, CO2 biological utilization, CO2 geological utilization/storage, and CO2 chemical utilization, were introduced in detail, and the application prospects of these technologies were analyzed. Secondly, based on the characteristics of China's energy structure, the layout, technical path, and implementation of CCUS projects in industries such as thermal power, coal chemical, petrochemical, metallurgy, and building materials were analyzed, as well as the technical challenges and development needs faced. Although CCUS technology has been widely applied in China, issues such as high costs and insufficient technological maturity persist, making it particularly important to strengthen research and development of CCUS technology and promote the construction of CCUS full-chain projects in industries that use fossil fuels. In the future, developing efficient, low-energy-consuming, non-toxic, and non-corrosive capture solvents and systems will be at the core of CO2 capture technology development, while producing high value-added chemical products and ensuring the safe and permanent storage of CO2 will be an important direction for the development of CO2 utilization/storage technology. Various CO2 utilization and storage technologies are analyzed and compared, and it is found that CO2 mineralization utilization/storage technology has outstanding advantages. As an efficient and safe permanent CO2 storage solution, it can not only transform alkaline solid waste on a large scale, but also provide raw materials for the construction industry, achieving the recycling of construction waste. The on-site emission reduction feature of this technology can effectively solve the problem of supply-demand mismatch between CO2 emission sites and consumption sites, ensuring that carbon consumption sites have carbon available while carbon sources are utilized on-site. Building CO2 capture-utilization-storage integrated operation systems at sites suitable for CO2 mineralization utilization/storage technology can reduce the operating costs of the entire industry chain, and promote the development of the CO2 capture-utilization-storage full-chain industry, bringing significant environmental and economic benefits. Looking ahead, while adjusting its energy structure, China should increase efforts to transform or construct CCUS in related industries, especially the implementation of full-chain CCUS projects, to achieve effective carbon sequestration. CO2 mineralization utilization/storage technology, as an efficient and highly reliable permanent CO2 storage technology, will become one of the important methods for carbon emission reduction and utilization in the future, showing tremendous development potential.

     

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