化工进展 ›› 2018, Vol. 37 ›› Issue (12): 4908-4916.DOI: 10.16085/j.issn.1000-6613.2018-1237

• 资源与环境化工 • 上一篇    下一篇

钙基碳载体造粒的捕集CO特性及力学性能

迟长云, 李英杰   

  1. 山东大学能源与动力工程学院, 山东 济南 250061
  • 收稿日期:2018-06-13 修回日期:2018-09-18 出版日期:2018-12-05 发布日期:2018-12-05
  • 通讯作者: 李英杰,教授,博士生导师,研究方向为碳捕集、燃烧污染物控制技术及储能。
  • 作者简介:迟长云(1993-),女,硕士,研究方向为碳捕集、燃烧污染物控制技术。
  • 基金资助:
    国家自然科学基金委员会-山西煤基低碳联合基金(U1510130)及山东省重点研发计划(2016GSF117001)项目。

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

CHI Changyun, LI Yingjie   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2018-06-13 Revised:2018-09-18 Online:2018-12-05 Published:2018-12-05

摘要: 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。

关键词: 钙基碳载体, 造粒, 多孔Al2O3球粉, CO2捕集, 力学性能

Abstract: 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.

Key words: calcium-based sorbent, granulation, porous Al2O3 powder, CO2 capture, mechanical properties

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