Research status and development of flue gas denitrification technology in selective non-catalytic reduction
Selective non-catalytic reduction(SNCR)denitration technology is widely used for NOx emission control of flue gas after combustion,especially for flue gas denitration of CFB boiler.The NOx removal efficiency of SNCR engineering application is affected by many factors,and the low flue gas temperature during the current CFB peak-shaving operation leads to poor SNCR removal performance.The research status and development of SNCR technology were described,the main process parameters affecting denitrification performance were analyzed.The synergistic characteristics of various new reductants and active additives on denitrification efficiency were compared.The characteristics of different SNCR reaction kinetic models and key reaction mechanisms were summarized in this paper.Optimization methods such as arranging SNCR denitration spray guns at the secondary tuyere of CFB boiler,misplacing spray guns and non-constant speed atomizing injection can improve the denitration efficiency to some extent.Polymer solid denitration agent loaded with amino reducing agent,active additive and combustion improver has remarkable low-temperature synergistic performance.Hydrophilic additives(ethanol,acetic acid,hydrogen peroxide)and alkali metal compounds(sodium carbonate,sodium hydroxide and sodium acetate)have good engineering application prospects for SNCR low-temperature synergistic denitration.Combining mechanism experiments and reaction dynamics simulation calculation,the micro-reaction mechanism of SNCR will be explored and will provide theoretical reference for the synergistic optimization of this process.
selective non catalytic reductionCFB boilerflue gas denitrificationreaction kineticssynergistic optimization
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