Study on Mercury Removal Performance of Alkali Adsorbent in Coal-Fired Power Plant

doi:10.11930/j.issn.1004-9649.201912098

Abstract

Abstract: Mercury pollution in coal-fired power plants has received widespread attention. At present, being the most mature technology, the activated carbon injection technology has been implemented for mercury removal in coal-fired power plants. However, activated carbon needs to be further transformed which is accompanied with its relatively high application cost. Therefore, the mercury removal with various types of adsorbent has become a hot research topic both domestically and abroad. In this article, based on the alkaline adsorbent removal system of Unit 7 of Datang Yangcheng Power Plant, the mercury removal effect of dry NaHCO₃ powder is tested and explored using Ontario Hydro Method (OHM). The results show that at the reaction temperature of SCR, NaHCO₃ can convert most of Hg⁰ and a small amount of Hg²⁺ into Hg^P. Furthermore, the Hg^P conversion rate is close to maximum when the injection volume of NaHCO₃ reaches 480 kg/h. This study provides a practical and feasible technical route for mercury removal from coal-fired flue gas.

Key words: coal-fired power plant, OHM mercury sampling, alkaline adsorbent, mercury removal

ZHAO Bing, WANG Haigang, HU Dong, CHEN Kunyang, JIN Xuliang, YIN Aiming. Study on Mercury Removal Performance of Alkali Adsorbent in Coal-Fired Power Plant[J]. Electric Power, 2020, 53(9): 208-213.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201912098

https://www.electricpower.com.cn/EN/Y2020/V53/I9/208

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