Methods to Reduce Mercury and Nitrogen Oxides Emissions from Coal Combustion Processes

M. Jȩdrusik, D. Łuszkiewicz, A. Świerczok
{"title":"Methods to Reduce Mercury and Nitrogen Oxides Emissions from Coal Combustion Processes","authors":"M. Jȩdrusik, D. Łuszkiewicz, A. Świerczok","doi":"10.5772/intechopen.92342","DOIUrl":null,"url":null,"abstract":"The chapter presents the issue of reducing mercury and nitrogen oxides emissions from the flue gas of coal-fired boilers. The issue is particularly relevant due to the stricter regulations regarding exhaust gas purity. A brief review of the methods for reducing Hg and NOx emissions has been made, pointing out their pros and cons. Against this background, the results of the authors’ own research on the injection of selected oxidants into flue gases to remove both of these pollutants are presented. The injection of sodium chlorite solution into the flue gas (400 MWe lignite fired unit) upstream the wet flue gas desulphurization (WFGD) absorber contributed to the oxidation of both metallic mercury and nitric oxide and enhanced their removal efficiency. The results of tests on lignite and hard coal flue gases indicate that in order to reduce the unfavorable phenomenon of mercury re-emission from WFGD absorbers, in some cases, it is necessary to add selected chemical compounds (e.g., sulfides) to the desulfurization system. The results of field tests for flue gas from lignite (400 MWe unit) and hard coal-fired boilers (195 and 220 MWe units) confirmed the usefulness of oxidizer injection technology to reduce mercury emissions below the level required by BAT conclusions.","PeriodicalId":330897,"journal":{"name":"Environmental Emissions","volume":"6 3","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2020-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Emissions","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5772/intechopen.92342","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

The chapter presents the issue of reducing mercury and nitrogen oxides emissions from the flue gas of coal-fired boilers. The issue is particularly relevant due to the stricter regulations regarding exhaust gas purity. A brief review of the methods for reducing Hg and NOx emissions has been made, pointing out their pros and cons. Against this background, the results of the authors’ own research on the injection of selected oxidants into flue gases to remove both of these pollutants are presented. The injection of sodium chlorite solution into the flue gas (400 MWe lignite fired unit) upstream the wet flue gas desulphurization (WFGD) absorber contributed to the oxidation of both metallic mercury and nitric oxide and enhanced their removal efficiency. The results of tests on lignite and hard coal flue gases indicate that in order to reduce the unfavorable phenomenon of mercury re-emission from WFGD absorbers, in some cases, it is necessary to add selected chemical compounds (e.g., sulfides) to the desulfurization system. The results of field tests for flue gas from lignite (400 MWe unit) and hard coal-fired boilers (195 and 220 MWe units) confirmed the usefulness of oxidizer injection technology to reduce mercury emissions below the level required by BAT conclusions.
减少煤炭燃烧过程中汞和氮氧化物排放的方法
本章介绍了减少燃煤锅炉烟气中汞和氮氧化物排放的问题。由于对废气纯度的规定更加严格,这个问题尤为重要。简要回顾了减少汞和氮氧化物排放的方法,指出了它们的优缺点。在此背景下,作者自己研究了将选定的氧化剂注入烟气中以去除这两种污染物的结果。在湿法烟气脱硫(WFGD)吸收器上游的烟气(400 MWe褐煤燃烧装置)中注入亚氯酸钠溶液有助于金属汞和一氧化氮的氧化,并提高了它们的去除效率。褐煤和硬煤烟道气的试验结果表明,为了减少WFGD吸收器汞再排放的不利现象,在某些情况下,有必要在脱硫系统中添加选定的化合物(例如硫化物)。褐煤(400兆瓦单位)和硬煤锅炉(195和220兆瓦单位)的烟气现场试验结果证实,氧化剂注入技术有助于将汞排放量减少到BAT结论所要求的水平以下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信