Application of SNCR to reduction of NOx in an industrial scale slag-tap pulverized coal boiler

doi:10.16085/j.issn.1000-6613.2019-2089

Abstract

Abstract:

In order to test the application effect of SNCR denitration technology in high efficiency and low NO_x slag-tap pulverized coal industrial boiler, the industrial test of SNCR denitration technology was carried out in the furnace of an 8.4MW organic heat carrier boiler. Urea was selected as reducing agent, and an industrial SNCR denitration test platform was built. The SNCR denitrification tests under different urea solution injection volume, different oxygen content, and different boiler loads were carried out with urea solutions of three concentrations of 10%, 15% and 20%. The preliminary test results show that: the proposed "low NO_x combustion + SNCR denitration" coupling technology scheme is feasible, SNCR denitration efficiency is above 80%, and can completely meet the ultra-low emission requirements of NO_x in the flue gas below 50mg/m³.

Key words: pulverized coal industrial boiler, selective non-catalytic reduction denitrification, slag tapping, urea, low nitrogen oxides

摘要：

为了检验选择性非催化还原（SNCR）脱硝技术在高效低NO_x液态排渣煤粉工业锅炉中的应用效果，本文在一台8.4MW有机热载体锅炉炉膛内开展了SNCR脱硝技术工业化试验研究。选用尿素作为还原剂，搭建了工业化SNCR脱硝试验平台。在10%、15%、20%三种浓度尿素溶液下进行了不同尿素溶液喷射量、不同氧含量、不同锅炉负荷下的SNCR脱硝试验研究。试验结果表明，提出的“低NO_x燃烧+SNCR脱硝”耦合技术方案是可行的，SNCR脱硝效率在80%以上，完全能够达到烟气中NO_x低于50mg/m³的超低排放要求。

关键词: 煤粉工业锅炉, 选择性非催化还原脱硝, 液态排渣, 尿素, 低氮氧化物

CLC Number:

X701

Sai CHEN, Mingsheng JIA, Minggao GUO, Gaozhen LIU. Application of SNCR to reduction of NO_x in an industrial scale slag-tap pulverized coal boiler[J]. Chemical Industry and Engineering Progress, 2020, 39(10): 4290-4296.

陈赛, 贾明生, 郭明高, 刘高珍. SNCR脱硝技术在液态排渣煤粉工业锅炉中的应用[J]. 化工进展, 2020, 39(10): 4290-4296.

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Application of SNCR to reduction of NO_x in an industrial scale slag-tap pulverized coal boiler

SNCR脱硝技术在液态排渣煤粉工业锅炉中的应用

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