CIESC Journal ›› 2017, Vol. 68 ›› Issue (6): 2555-2562.DOI: 10.11949/j.issn.0438-1157.20161596

Previous Articles     Next Articles

CO2 absorption by aqueous ammonia solution with use of external magnetic field

ZHANG Qi, WU Jiayi, LU Ping, WU Tao, SHAO Jingping, DENG Xiaoyan   

  1. School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, Jiangsu, China
  • Received:2016-11-10 Revised:2017-02-26 Online:2017-06-05 Published:2017-06-05
  • Contact: 10.11949/j.issn.0438-1157.20161596
  • Supported by:

    supported by the National Natural Science Foundation of China (51606105) and the Natural Science Foundation of Jiangsu Province (BK20130905)

磁场对氨水吸收烟气中CO2的促进作用

张琦, 吴佳艺, 卢平, 吴涛, 邵静萍, 邓晓艳   

  1. 南京师范大学能源与机械工程学院, 江苏 南京 210042
  • 通讯作者: 卢平
  • 基金资助:

    国家自然科学基金项目(51606105);江苏省自然科学基金项目(BK20130905)

Abstract:

A novel ammonia-based CO2 capture process was proposed in the paper. The process uses magnetically gas-solid-liquid bed as the reactor in which the ferromagnetic particles suspend in aqueous ammonia solutions under the influence of external magnetic field (EMF). A continuous of CO2 passed through the reactor was absorbed by aqueous ammonia. Experiments in a laboratory-scale apparatus were carried out to investigate the roles of EMF. The results showed that the highest CO2 absorption efficiency with 8 mT EMF and 2 g·L-1 nano-magnetic particles reached 94.3%, more than 8.8% compared to that without EMF and nanoparticles. CO2 absorption efficiency with EMF and nanoparticles increased significantly under the conditions of low concentration aqueous ammonia (5%—8%), large flux of simulated flue gas (3.5 L·min-1) and low absorption temperature (22—36℃). The enhancement of CO2 absorption under the influence of EMF and nanoparticles should be attributed to good gas-liquid contact, large mass transfer coefficient and high reactivity of aqueous ammonia.

Key words: CO2 capture, magnetic field, aqueous ammonia solution, absorption, nanoparticles

摘要:

开发了一种新型磁场辅助氨法烟气脱碳技术。含碳烟气通入混有磁性颗粒的氨水溶液,在外加磁场的作用下发生脱碳反应。对该技术的运行特性开展了实验研究。结果表明,外加8 mT恒稳磁场,2 g·L-1纳米级Fe3O4颗粒,氨水的CO2脱除效率比不添加磁场和颗粒时最多可提高8.8%。外加磁场可以有效提高低浓度氨水的CO2脱除效率。在模拟烟气流量增加时,外加磁场能有效减缓CO2脱除效率下降的趋势。同时,外加磁场使得CO2脱除效率曲线向低温方向移动5℃,有助于提高低温条件下的CO2脱除效率。磁场可提高气液接触效率、降低相间传质阻力、增强氨水反应活性,从而提高氨水吸收CO2性能。

关键词: 二氧化碳捕集, 磁场, 氨水, 吸收, 纳米颗粒

CLC Number: