钙基碳载体造粒的捕集CO特性及力学性能

采用挤出滚圆法对钙基碳载体Ca（OH）₂进行造粒。在双固定床反应器上研究了黏结剂、支撑体和造孔剂对造粒后钙基碳载体循环捕集CO₂性能的影响，并提出采用多孔Al₂O₃球粉作为新型支撑体。结果表明，选择聚乙烯吡咯烷酮为颗粒黏结剂时最佳添加量为2%。高铝水泥和多孔Al₂O₃球粉均可作为支撑体造粒。多孔Al₂O₃球粉作为支撑体造粒后碳载体的循环捕集CO₂性能更高，其10次循环后CO₂吸收量为0.23g/g，是添加高铝水泥造粒碳载体的1.35倍。微晶纤维素作为造孔剂显著提高了造粒碳载体的循环捕集CO₂性能。多孔Al₂O₃球粉作为支撑体造粒后碳载体的抗压强度略高于高铝水泥作为支撑体。多孔Al₂O₃球粉造粒钙基碳载体拥有大量30~100nm孔隙，其比孔容高于高铝水泥造粒碳载体，这有利于CO₂捕集。

CO2 capture performance and mechanical properties of granulated calcium-based sorbent

The calcium-based sorbents[Ca(OH)₂] were granulated by extrusion-spheronization method. The influences of binder, proppant and pore forming material on CO₂ capture capacities of the granulated calcium-based sorbents were studied in a dual fixed-bed reactor. And porous Al₂O₃ powder was proposed as a novel proppant. The results showed that when polyvinyl pyrrolidone(PVP) is as a binder, the optimum addition ratio is 2%. High-aluminium cement and porous Al₂O₃ powder are good inert supports for the pelletization of calcium-based sorbents. The granulated sorbent using porous Al₂O₃ powder showed higher CO₂ capture capacity than that using high-aluminium cement. CO₂ uptake of the pelletized sorbent using porous Al₂O₃ powder was 0.23 g(CO₂)/g(sorbent) after 10 cycles, which is 1.35 times higher than that of the pelletized sorbent using high-aluminium cement. Microcrystalline cellulose as a pore forming material effectively improves CO₂ capture capacity of the pelletized sorbent, but it decreases its compressive strength. The compressive strength of the pelletized sorbent using porous Al₂O₃ powder is higher than that using high-aluminium cement. The specific pore volume of the pelletized sorbent using porous Al₂O₃ powder, which possesses lots of pores in the range of 30-100nm in diameter, is higher than that using high-aluminium cement. This is beneficial for CO₂ capture.