化工进展 ›› 2019, Vol. 38 ›› Issue (08): 3562-3571.DOI: 10.16085/j.issn.1000-6613.2018-2402

• 化工过程与装备 • 上一篇    下一篇

Na2CO3基吸附剂颗粒制备及其脱碳性能

雷苏(),曾鹏鑫,王鹏,张路珧,姚睿璇,赵传文(),孙健,郭亚飞,祝秀明,卢平   

  1. 南京师范大学能源与机械工程学院,江苏 南京 210042
  • 收稿日期:2018-12-12 出版日期:2019-08-05 发布日期:2019-08-05
  • 通讯作者: 赵传文
  • 作者简介:雷苏(1998—),女,本科生,研究方向为CO2捕集与利用。E-mail:3291340183@qq.com
  • 基金资助:
    国家自然科学基金(U1510129)

Investigation on granulation and CO2 uptake of Na2CO3-basedsorbent pellets

Su LEI(),Pengxin ZENG,Peng WANG,Luyao ZHANG,Ruixuan YAO,Chuanwen ZHAO(),Jian SUN,Yafei GUO,Xiuming ZHU,Ping LU   

  1. College of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, Jiangsu, China
  • Received:2018-12-12 Online:2019-08-05 Published:2019-08-05
  • Contact: Chuanwen ZHAO

摘要:

采用挤压-滚圆法制备Na2CO3基CO2吸附剂微球颗粒,在自行设计的CO2吸收系统中对制备的样品进行脱碳性能测试。结合相关表征测试,探明不同载体、不同负载量的Na2CO3基吸附剂的微观结构、脱碳性能以及机械性能的变化规律和内在原因。研究表明:不同载体的Na2CO3基吸附剂颗粒脱碳性能存在明显差异,其中氧化铝负载的吸附剂(Na2CO3/Al2O3)的脱碳性能最好,可达1.14mmol/g。铝酸钙水泥负载的吸附剂(Na2CO3/CA)机械性能较好,但其脱碳性能最差。结合吸附剂脱碳和机械性能的综合考量,Na2CO3/Al2O3是最为合适的CO2吸附剂,并进一步研究不同Na2CO3负载量的影响。研究发现随着Na2CO3负载量的变化,吸附剂的微观结构、脱碳性能以及机械性能都存在明显的差异。虽然60%负载量的Na2CO3/Al2O3吸附剂颗粒的机械性能和脱碳效果较好,但其成球度较差,影响其实际应用。质量分数40%负载量的Na2CO3/Al2O3吸附剂颗粒具有良好的脱碳性能、机械性能以及成球度,CO2脱除量为1.36mmol/g。总体而言,利用挤压-滚圆法制备的Na2CO3基吸附剂颗粒具有良好的流动特性、脱碳性能和机械性能,适用于电厂烟气中的CO2脱除。

关键词: CO2捕集, Na2CO3基吸附剂颗粒, 挤压-滚圆, 负载量, 机械性能

Abstract:

Na2CO3-based CO2 sorbent pellets were prepared via extrusion-spheronization method, and whose CO2 capture performance was tested using a self-designed CO2 sorption system. The microstructure, CO2 capture performance and mechanical properties of Na2CO3-based sorbent pellets with different supports and loadings were investigated. The results showed that Na2CO3-based sorbent pellets with different supports exhibited relatively large discrepancy on CO2 capture performance. The alumina-supported sorbent pellet (Na2CO3/Al2O3) possessed the highest CO2 capture capacity of 1.14mmol/g. However, the calcium aluminate cement-supported sorbent pellets (Na2CO3/CA) exhibited the good mechanical properties and inferior CO2 capture performance. Comprehensively considering the CO2 capture performance and mechanical properties, Na2CO3/Al2O3 is the most suitable CO2 sorbent. Moreover, the effect of loading amount of Na2CO3 on performance of Na2CO3/Al2O3 sorbent pellets was further studied. It was found that the microstructure, CO2 capture performance and mechanical properties of Na2CO3/Al2O3 sorbent pellets were closely related to loading amount of NaCO3. Although the pellets loaded with 60% of NaCO3 exhibited the superior mechanical properties and CO2 capture performance, their poor sphericity impeded the practical application. The Na2CO3/Al2O3 sorbent pellets loaded with 40% of NaCO3 exhibited good CO2 capture performance, mechanical properties and sphericity, whose CO2 capture capacity is 1.36mmol/g. Therefore, the Na2CO3-based sorbent pellets prepared via extrusion-spheronization were suitable to be applied for CO2 removal in power plant flue gas due to their good fluidization characteristics, CO2 capture performance and mechanical properties.

Key words: CO2 capture, Na2CO3-based sorbent pellets, extrusion-spheronization, loading amount, mechanical properties

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