水泥行业钙循环碳捕集技术进展及趋势

Progress and Recent Trend of Calcium-Looping Carbon Capture Technology in Cement Industry

水泥行业作为高耗能高排放的典型行业之一,面临着巨大的碳减排压力,碳捕集技术被认为是实现水泥行业脱碳的重要技术支撑。总结了水泥行业几种典型的碳捕集技术发展现状,并从钙基吸附剂改性方法和优化循环条件两方面综述了钙循环碳捕集技术的改进方法。通过选取白云石、方解石、贝壳以及有机钙基前驱体等性能优良的钙基前驱物,改进CaO制备方法,并结合金属盐和惰性元素掺杂,能使钙循环过程中吸附剂孔隙结构更为丰富和稳定,改善循环性能。降低煅烧反应温度和减小CO_(2)分压力是优化钙基吸附剂循环反应条件的主要方向。为加快推进钙循环碳捕集技术应用,应进一步开展关键技术和装备研发,提高技术可行性;同时结合相关行业特性,对现有主流技术进行集成优化,降低碳捕集成本。

As one of the typical industries with high energy consumption and high carbon emission, the cement industry is facing huge pressure to reduce carbon emissions, and carbon capture technology is considered to be an important technical support to achieve decarbonization in the cement industry. The progress of several typical carbon capture technologies in cement industry is summarized, and the improvement methods of calcium-looping carbon capture technology are reviewed in terms of calcium-based adsorbent modification and cycle conditions optimization. By selecting calcium-based precursors with good performance such as dolomite, calcite, shell and organic calcium-based precursors, improving CaO preparation methods,and doping metal salts and inert elements, the pore structure of the adsorbent during the calcium-looping can be made more abundant and stable, thus, the cycle performance can be improved. Lowering the calcination reaction temperature and reducing the CO_(2)partial pressure are two main directions to optimize the calcium-based adsorbent cycling conditions. In order to accelerate the application of calcium-looping carbon capture technology, further research and development of key technologies and equipment should be carried out to improve the technical feasibility;meanwhile, the existing mainstream carbon capture technologies should be integrated and optimized to reduce the cost of carbon capture by combining the characteristics of relevant industries.