磁性吸附剂脱汞机理及技术研究进展

华电技术 ›› 2019, Vol. 41 ›› Issue (12): 8-15.

磁性吸附剂脱汞机理及技术研究进展

1.华电郑州机械设计研究院有限公司，郑州〓450046； 2.华中科技大学煤燃烧国家重点实验室，武汉〓430074

出版日期:2019-12-25 发布日期:2020-01-17

Mechanism and technology development of magnetic adsorbent for mercury removal

1.Huadian Zhengzhou Mechanical Design Institute Company Limited, Zhengzhou 450046, China; 2.State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074, China

Online:2019-12-25 Published:2020-01-17

摘要/Abstract

摘要：

针对现有的协同脱汞技术及活性炭喷射脱汞技术所存在的缺陷，提出了利用飞灰磁珠制备可再生磁性脱汞吸附剂的新方法。使用浸渍热解法制备了活性组分改性磁珠，通过固定床吸附实验考察了改性磁珠在复杂烟气组分下的脱汞性能，探究了脱汞机理，并进行了多次循环再生脱汞试验。研究结果表明：改性磁珠在低氯复杂烟气组分条件下维持了较高的脱汞效率，且具有良好抗酸性气体性能。磁珠的脱汞性能来自于晶格氧或表面吸附氧及活性氯与Hg0发生的非均相氧化反应。改性磁珠在含有O2及HCl的气流下加热即可实现再生，高温下汞会从吸附剂表面脱附。改性磁珠吸附剂具有良好的再生性能，多次循环再生后维持了较强的脱汞能力。

关键词:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">燃煤烟气, 脱汞, 磁性吸附剂, 循环再生

Abstract:

Aiming at the shortcomings of the existing collaborative mercury removal technology and activated carbon spray mercury removal technology, a new method of preparing renewable magnetic mercury removal adsorbent using ferrospheres in fly ash was proposed.The modified ferrospheres with active component were prepared by dippingthermal decomposition method.The mercury removal performance of the modified ferrospheres in flue gas with complex components was investigated in fixed bed adsorption experiments and the mechanism of mercury removal was explored. After multiple recycling and regeneration mercury removal experiments,the results show that the modified ferrospheres maintain high mercury removal efficiency in complex lowchlorine flue gas，and it is of good acid resistance.The mercury removal performance of ferrospheres comes from the heterogeneous oxidation reaction of lattice oxygen or adsorbed oxygen, active chlorine and Hg0.The modified ferrospheres can be regenerated by heating in air stream containing O2 and HCl, and mercury will be desorbed from the adsorbent surface at high temperature.The modified ferrospheres adsorbent has good regeneration performance and maintains a strong mercury removal capacity after multiple recycling and regeneration.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">coalfont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">fired flue gas, mercury removal, magnetic adsorbent, regeneration

商永强1，赵永椿2. 磁性吸附剂脱汞机理及技术研究进展[J]. 华电技术, 2019, 41(12): 8-15.

SHANG Yongqiang1，ZHAO Yongchun2.

Mechanism and technology development of magnetic adsorbent for mercury removal [J]. Huadian Technology, 2019, 41(12): 8-15.

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