钙基脱硫工艺协同脱硝技术研究进展

doi:10.16085/j.issn.1000-6613.2015.10.036

摘要/Abstract

摘要： 采用钙基吸收剂的烟气脱硫技术拥有95%以上的市场份额,基于钙基烟气脱硫工艺协同乃至同时脱除NO_x是最现实可行的技术方向。本文阐明了钙基脱硫工艺协同脱硝的可行性,并根据硫氮协同脱除反应所处的温度区段,将钙基吸收剂硫氮协同脱除技术分为炉内联合脱除、中温同时脱除和低温段协同脱除三类,针对每类技术的基本原理、研究现状和存在的问题进行了分析和总结,指出将NO氧化为NO₂在低温段实现SO₂和NO_x协同乃至同时脱除是最现实可行的技术方向,并针对该技术存在的NO₂在低温脱硫工艺中吸收效率低和钙基吸收剂利用率低的问题提出了研究方向。最后,对钙基脱硫工艺协同脱硝技术的发展进行了展望,指出了实施超净排放后基于低温脱硫工艺协同脱硝技术应具有广阔的工业应用前景。

关键词: 协同脱除, 二氧化硫, 氮氧化物, 钙基吸收剂, 燃煤污染物

Abstract: Due to wide use and low price, Ca-based absorbents have become the mainstream sorbents used to remove SO₂ in coal-fired power plants. It is plausible to develop SO₂ and NO_x synergistic removal based on the calcium-based desulfurization technology. The feasibility of developing SO₂ and NO_x synergistic removal by calcium based absorbents is illustrated in this paper. According to reaction temperature of SO₂ and NO_x synergistic removal, SO₂ and NO_x synergistic removal technologies are divided into SO₂ and NO_x combined removal in furnace, SO₂ and NO_x simultaneous removal at medium temperature and SO₂ and NO_x synergistic removal at low temperature. The basic principles, research status and problems of each type of technology are analyzed. NO_x can be removed at low temperature in the Ca-based FGD process by using the oxidation method to convert NO to NO₂, but NO₂ absorption efficiency and absorbent utilization are two key issues which restrict the technology progress. The development of SO₂ and NO_x synergistic removal by calcium-based desulfurization is prospected. SO₂ and NO_x synergistic removal at low temperature will have broad industrial application and development prospect as ultra-low emission is achieved in the coal-fired power plants.

Key words: simultaneous removal of SO₂ and NO_x, sulfur dioxide, nitrogen oxides, Ca-based absorbent, coal fired pollutants

中图分类号:

TQ137.12

陈国庆, 高继慧, 黄启龙, 戴维葆, 蔡培, 吴少华, 秦裕琨. 钙基脱硫工艺协同脱硝技术研究进展[J]. 化工进展, 2015, 34(10): 3755-3761.

CHEN Guoqing, GAO Jihui, HUANG Qilong, DAI Weibao, CAI Pei, WU Shaohua, QIN Yukun. Research progress of SO₂ and NO_x synergistic removal by calcium-based desulfurization[J]. Chemical Industry and Engineering Progree, 2015, 34(10): 3755-3761.

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