煤焦直接还原脱除烟道气氮氧化物

doi:10.3969/j.issn.0438-1157.2014.06.040

化工学报 ›› 2014, Vol. 65 ›› Issue (6): 2249-2255.DOI: 10.3969/j.issn.0438-1157.2014.06.040

煤焦直接还原脱除烟道气氮氧化物

方晓晴^1,2, 范垂钢¹, 都林¹, 宋文立¹, 林伟刚¹, 李松庚¹

1. 中国科学院过程工程研究所多相复杂国家重点实验室, 北京 100190;
2. 中国科学院大学, 北京 100049

收稿日期:2013-08-29 修回日期:2014-01-07 出版日期:2014-06-05 发布日期:2014-06-05
通讯作者: 李松庚
作者简介:方晓晴（1987- ），女，硕士研究生
基金资助:
环保公益行业科研专项（201109069）。

Reduction of nitric oxide in flue gas by coal char

FANG Xiaoqing^1,2, FAN Chuigang¹, DU Lin¹, SONG Wenli¹, LIN Weigang¹, LI Songgeng¹

1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2013-08-29 Revised:2014-01-07 Online:2014-06-05 Published:2014-06-05
Supported by:
supported by the Special Funds for the Scientific Research of State Environmental Protection Public Welfare(201109069).

摘要/Abstract

摘要： 选用3种不同煤焦，采用程序升温和恒温实验方法，在固定床上考察了不同实验条件下的NO转化率和C对NO选择性，分析了煤焦脱硝的机理和影响因素。实验结果表明：NO和O₂在煤焦表面发生化学吸附所形成的络合物在脱硝过程中起着关键作用，影响C-NO反应和C-O₂反应的竞争与协作关系。在所考察的煤焦中锡林浩特褐煤焦脱硝效果最好，当温度为723 K时烟道气中NO还原率可达99%；在温度623～923 K、O₂浓度0～5%范围内，提高温度和O₂浓度均有利于提高NO转化率，而降低O₂浓度有利于提高C对NO选择性；烟道气中NO浓度越高，其转化率越低，但C对NO选择性越高。

关键词: 煤焦, 氮氧化物, 还原, 选择性

Abstract: NO reduction by coal char was investigated in a fixed bed reactor using a simulated flue gas. Two different operation modes(programmed temperature and constant temperature) were employed to explore the mechanism of NO removal by coal char and to study the effects of the variables on NO removal efficiency and selectivity including temperature, coal type, NO and oxygen concentrations in flue gas and space velocity. The results indicated that surface complexes formed by chemisorption of NO and O₂ on carbon active sites played the key role in reactions between C-NO and C-O₂. XLHT coal char showed both the highest rate of NO reduction and C-NO selectivity among the coal chars studied. NO reduction by XLHT coal char could reach 99% at 723 K. Under the experimental conditions in this work, an increase in temperature and/or oxygen concentration in flue gas enhanced NO reduction. However, C-NO selectivity decreased with the increasing O₂ concentration. Higher NO concentration in flue gas led to lower NO reduction but higher C-NO selectivity.

Key words: coal char, nitric oxide, reduction, selectivity

中图分类号:

TQ536.9

方晓晴, 范垂钢, 都林, 宋文立, 林伟刚, 李松庚. 煤焦直接还原脱除烟道气氮氧化物[J]. 化工学报, 2014, 65(6): 2249-2255.

FANG Xiaoqing, FAN Chuigang, DU Lin, SONG Wenli, LIN Weigang, LI Songgeng. Reduction of nitric oxide in flue gas by coal char[J]. CIESC Journal, 2014, 65(6): 2249-2255.

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煤焦直接还原脱除烟道气氮氧化物

Reduction of nitric oxide in flue gas by coal char

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