[1]梁秀进,仲兆平,金保升,等.CH4作添加剂对SNCR脱硝工艺的影响[J].东南大学学报(自然科学版),2009,39(3):629-634.[doi:10.3969/j.issn.1001-0505.2009.03.039]
 Liang Xiujin,Zhong Zhaoping,Jin Baosheng,et al.Influence of CH4 additive on SNCR process[J].Journal of Southeast University (Natural Science Edition),2009,39(3):629-634.[doi:10.3969/j.issn.1001-0505.2009.03.039]
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CH4作添加剂对SNCR脱硝工艺的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
39
期数:
2009年第3期
页码:
629-634
栏目:
环境科学与工程
出版日期:
2009-05-20

文章信息/Info

Title:
Influence of CH4 additive on SNCR process
作者:
梁秀进 仲兆平 金保升 陈晓林 魏宏鸽 郭厚焜
东南大学能源与环境学院, 南京 210096
Author(s):
Liang Xiujin Zhong Zhaoping Jin Baosheng Chen Xiaolin Wei Hongge Guo Houkun
School of Energy and Environment, Southeast University, Nanjing 210096,China
关键词:
选择性非催化还原脱硝 气态NH3 CH4 添加剂
Keywords:
selective non-catalytic reduction gaseous NH3 CH4 additive
分类号:
X51
DOI:
10.3969/j.issn.1001-0505.2009.03.039
摘要:
为改善选择性非催化还原(SNCR)脱硝工艺的反应特性,对CH4作添加剂对SNCR工艺的影响进行了理论分析和试验研究.在自制的SNCR脱硝试验台上采用自制的改进型槽缝式TB系列喷嘴中心逆流喷入还原剂,冷态混合试验发现在还原剂携载气流与主气流流速比为0.15时即可得到良好的混合效果.在氨氮摩尔比1.25、无添加剂、900 ℃条件下取得NOx最大去除率82.48%,有添加剂、875 ℃条件下取得NOx最大去除率73.19%.随着温度的降低,达到既定温度条件下最大NOx去除率所需的CH4添加量增大.高于885 ℃,添加CH4会降低NOx的去除率,低于885 ℃则可以提高NOx的去除率,降低和提高的幅度随CH4添加量的增大而增大.添加CH4可以使工艺的反应温度窗降低并变宽,以NOx去除率高于50%为标准,无CH4作添加剂的温度窗口为863~937 ℃,有CH4作添加剂的温度窗口为803~929 ℃.在775~850 ℃温度范围内,添加CH4可明显提高NOx的去除率.有CH4作添加剂可以大大降低氨的泄漏量,氨的泄漏量随着CH4的添加量的增大而减小.
Abstract:
To improve the reaction characteristics of the selective non-catalytic reduction(SNCR)process, the theoretical analysis and the experimental study of the influence of CH4 as additive on the SNCR process are carried out.The reducing agent was jetting out from an improved TB series slit nozzle on the self-made SNCR reactor, and the cool experiments results show that a good mixing effect can be achieved with a flow rate ratio(jetting flow to bulk flow)of 0.15. With a normalized stoichiometric ratio 1.25, the maximum NOx removal efficiency with no additive is 82.48% at 900 ℃, and the maximum NOx removal efficiency with CH4 as additive is 73.19% at 875 ℃. CH4 addition needs to obtain the maximum NOx removal efficiency at certain temperature increases with the decrease in the reaction temperature. The addition of CH4 can improve the removal of NOx when the reaction temperature is below 885 ℃, while a negative effect may occur when the temperature is above 885 ℃. The beneficial or harmful effect increases with the increase in additions of CH4. The experimental results show that the temperature window of the process becomes lower and wider with the CH4 as additive. Taking the NOx removal efficiency higher than 50% as a criterion, the temperature window of the process is 863 to 937 ℃ without CH4, and 803 to 929 ℃with CH4 as additive. The suitable temperature section for improving the process effect with CH4 as additive is 775 to 850 ℃, in which NOx removal efficiency can be obviously improved through the addition of CH4. The NH3 slip can be significantly decreased with CH4 as additive; the more the CH4 addition, the less the NH3 slip.

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备注/Memo

备注/Memo:
作者简介: 梁秀进(1979—),男,博士生; 仲兆平(联系人),男,博士,教授,博士生导师,zzhong@seu.edu.cn.
基金项目: 国家高技术研究发展计划(863计划)资助项目(2008AA05Z303)、国家自然科学基金资助项目(50776019)、教育部新世纪优秀人才支持计划资助项目(NCET-05-0469).
引文格式: 梁秀进,仲兆平,金保升,等.CH4作添加剂对SNCR脱硝工艺的影响[J].东南大学学报:自然科学版,2009,39(3):629-634. [doi:10.3969/j.issn.1001-0505.2009.03.039]
更新日期/Last Update: 2009-05-20