Research progress on in-duct mercury removal by sorbent injection in power plant

doi:10.16085/j.issn.1000-6613.2018-0128

Abstract

Abstract: Mercury pollution from coal-fired power plants has attracted worldwide concern. Sorbent injection technology is considered to be the most promising and effective method for controlling mercury emission from the power plants. However, there are still many scientific questions about the widespread use of this technology in China's coal-fired power plants. This is because the process of mercury removal by sorbent is a diversified process including adsorption, diffusion, mass transfer and chemical reactions. Therefore, studies on in-duct mercury removal by sorbent injection have been a hot topic. In this paper, the recent research progress on the technology of sorbent injection for mercury removal in coal-fired power plants was reviewed in terms of the principle of sorbent injection, mercury sorbent evaluation method, mercury adsorption mechanism and mathematical model of sorbent injection. On these basis, the follow-up research directions were proposed such as development of cheap, efficient and renewable mercury removal sorbent, comprehensive and in-depth study on mercury removal mechanism of sorbent and development of simple and accurate mathematical models for mercury removal by sorbent injection. It can provide theoretical guidance for the development of sorbent injection technology for mercury removal in coal-fired power plants in China.

Key words: coal combustion, adsorbents, flue gas, mercury removal

摘要： 燃煤汞污染已引起广泛关注。燃煤电厂控制汞排放最成熟可行的技术是烟道活性炭喷射技术，但该技术在我国燃煤电厂的广泛应用还存在较多的科学问题，因为活性炭对烟气汞的脱除是包含吸附、扩散、传质及化学反应在内的多元化过程，因此，针对燃煤电厂吸附剂喷射脱汞技术的研究已成为当前的热点课题。本文从吸附剂喷射脱汞技术原理、脱汞吸附剂的评价方法、汞吸附机理研究以及吸附剂喷射脱汞数学模型方面评述了燃煤电厂吸附剂喷射脱汞技术近些年取得的研究进展，并在此基础上提出了开发廉价高效、可再生的脱汞吸附剂，全面深入研究吸附剂的脱汞机理以及开发简单、精确的吸附剂喷射脱汞数学模型等后续研究方向，可为我国燃煤电厂吸附剂喷射脱汞技术的开发提供一定指导。

关键词: 煤燃烧, 吸附剂, 烟道气, 脱汞

CLC Number:

X511

ZHOU Qiang, DUAN Yufeng, LU Ping. Research progress on in-duct mercury removal by sorbent injection in power plant[J]. Chemical Industry and Engineering Progress, 2018, 37(11): 4460-4467.

周强, 段钰锋, 卢平. 燃煤电厂吸附剂喷射脱汞技术的研究进展[J]. 化工进展, 2018, 37(11): 4460-4467.

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