CIESC Journal

• REACTION KINETICS, CATALYSIS AND…… • 上一篇    下一篇

碳酸钠促进选择性非催化还原脱硝的动力学模型与模拟

韩奎华; 路春美   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-08-28 发布日期:2007-08-28
  • 通讯作者: 韩奎华

Kinetic model and simulation of promoted selective non-catalytic reduction by sodium
carbonate

HAN Kuihua; LU Chunmei   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-08-28 Published:2007-08-28
  • Contact: HAN Kuihua

摘要: The detailed kinetic model of selective non-catalytic reduction (SNCR) of nitric oxide,
including sodium species reactions, was developed on the basis of recent studies on thermal
DeNOx mechanism, NOxOUT mechanism and promotion mechanism of Na2CO3. The model was
validated by comparison with several experimental findings, thus providing an effective
tool for the primary and promoted SNCR process simulation. Experimental and simulated
results show part-per-million level of sodium carbonate enhances NO removal efficiency and
extend the effective SNCR temperature range in comparison with use of a nitrogen agent
alone. The kinetic modeling, sensitivity and rate-of-production analysis suggest that the
performance improvement can be explained as homogeneous sodium species reactions producing
more reactive OH radicals. The net result of sodium species reactions is conversion of H2O
and inactive HO2 radicals into reactive OH radicals, i.e. H2O+HO2=3OH, which enhances the
SNCR performance of nitrogen agents by mainly increasing the production rate of NH2
radicals. Moreover, N2O and CO are eliminated diversely via the reactions Na+N2O=NaO+N2,
NaO+CO=Na+CO2 and NaO2+CO=NaO+CO2, in the promoted SNCR process, especially in the NOxOUT
process.

关键词: kinetic model;simulation;selective non-catalytic reduction;nitric oxide;sodium carbonate;mechanism

Abstract: The detailed kinetic model of selective non-catalytic reduction (SNCR) of nitric oxide,
including sodium species reactions, was developed on the basis of recent studies on thermal
DeNOx mechanism, NOxOUT mechanism and promotion mechanism of Na2CO3. The model was
validated by comparison with several experimental findings, thus providing an effective
tool for the primary and promoted SNCR process simulation. Experimental and simulated
results show part-per-million level of sodium carbonate enhances NO removal efficiency and
extend the effective SNCR temperature range in comparison with use of a nitrogen agent
alone. The kinetic modeling, sensitivity and rate-of-production analysis suggest that the
performance improvement can be explained as homogeneous sodium species reactions producing
more reactive OH radicals. The net result of sodium species reactions is conversion of H2O
and inactive HO2 radicals into reactive OH radicals, i.e. H2O+HO2=3OH, which enhances the
SNCR performance of nitrogen agents by mainly increasing the production rate of NH2
radicals. Moreover, N2O and CO are eliminated diversely via the reactions Na+N2O=NaO+N2,
NaO+CO=Na+CO2 and NaO2+CO=NaO+CO2, in the promoted SNCR process, especially in the NOxOUT
process.

Key words: kinetic model, simulation, selective non-catalytic reduction, nitric oxide, sodium carbonate, mechanism