Experimental study of selective non-catalytic reduction process with methylamine as reducing agent

PU Ge; DU Jiantai; ZHANG Zhang; ZHANG Dinghai; WU Bang; HUANG Beibei; ZHU Tuanhui

doi:10.11949/j.issn.0438-1157.20171687

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Experimental study of selective non-catalytic reduction process with methylamine as reducing agent

更新时间：2025-12-10

- Experimental study of selective non-catalytic reduction process with methylamine as reducing agent
- CIESC Journal Issue 7, Pages: 3234-3241(2018)
- 作者机构：
  
  1. 重庆大学低品位能源利用技术及系统教育部重点实验室,重庆,400044
  2. 东方电气集团东方锅炉股份有限公司,四川,成都,611731
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171687
  CLC： 51
- Online First：05 July 2018，
  
  Published：05 July 2018
- 稿件说明：
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PU Ge, DU Jiantai, ZHANG Zhang, et al. Experimental study of selective non-catalytic reduction process with methylamine as reducing agent[J]. CIESC Journal, 2018, (7): 3234-3241.
DOI：

PU Ge, DU Jiantai, ZHANG Zhang, et al. Experimental study of selective non-catalytic reduction process with methylamine as reducing agent[J]. CIESC Journal, 2018, (7): 3234-3241. DOI： 10.11949/j.issn.0438-1157.20171687.

摘要

为改善工业窑炉以及锅炉低负荷运行工况下的脱硝特性，本文对甲胺作还原剂的选择性非催化还原（SNCR）脱硝特性进行了实验研究，探讨了各控制因素对脱硝特性的影响以及分析了反应机理。实验结果表明：脱硝效率随反应温度呈双峰特性，拐点温度为750℃，最佳温度窗口为450～600℃；脱硝效率随氨氮比（NSR）增大而升高，反应产生的副产物NO2和N2O浓度随之增大；氧含量对SNCR脱硝特性具有双重特性，高浓度和低浓度氧气均对脱硝反应不利；物料浓度随NO初始浓度增加而增大，脱硝效率和副产物也提高； SO2浓度越高，脱硝效率下降越多；水汽含量增大，脱硝效率也随之增大。本文的实验结论有助于SNCR脱硝工艺应用于工业窑炉以及优化锅炉低负荷运行时的脱硝特性。

Abstract

Selective non-catalytic reduction (SNCR) denitration efficiency is lower than the minimum designed requirement when the boiler is operating under low load. To improve the characteristics of such working conditions

the feature of selective non-catalytic reduction denitration with methylamine as reductants is studied and the reaction mechanism is analyzed in the tube furnace reaction system. The effect of oxygen content

NSR

initial concentration of NO

SO2 and water content on the denitrification properties of methylamine SNCR is discussed. The results show that:the relationship between denitration efficiency and temperature is bimodal

the inflection point temperature is 750℃

and the best temperature window for practical industrial application is 450-600℃. The NO reduction efficiency was increased with the increase of NSR

and the concentration of NO2 and N2O was also augmented. The maximum NO removal efficiency was 85.0%. The oxygen content has dual characteristics to SNCR denitrification reaction

the efficiency of NO reduction is the greatest under the condition of 3% oxygen content. The increase of the initial concentration of NO makes the material concentration of the simulated flue gas increase

the NO reduction efficiency and the by-product increase. The higher concentration of SO2

the greater the reduction of NO reduction efficiency. The increase of water content was beneficial to the denitrification reaction. The experimental conclusion of methylamine SNCR denitrification in this paper is helpful to the application of selective non-catalytic reduction process with methylamine as reducing agent to industrial furnace and to optimize the denitrification characteristics of the boiler at low load operation.

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