化工进展
化工進展
화공진전
Chemical Industry and Engineering Progress
2015年
12期
4151-4157
,共7页
氮氧化物%烟气脱硝%选择性催化还原%喷射混合%均匀分布
氮氧化物%煙氣脫硝%選擇性催化還原%噴射混閤%均勻分佈
담양화물%연기탈초%선택성최화환원%분사혼합%균균분포
nitrogen oxides%flue gas denitrification(DeNOx)%selective catalytic reduction (SCR)%injection and mixing%uniform distribution
氨法选择性催化还原技术(SCR)因其优良的综合性能而成为工程应用最为广泛的烟气脱硝工艺,而反应器横截面上混合气体流场均匀性优劣是高效烟气脱硝的重要影响因素.本文简述了SCR烟气脱硝系统基本原理和 NH3/NOx混合效率指标;综述了线性控制式、分区控制式和混合型喷氨格栅等几种工程应用上主流技术及其最新研究成果,并分析了各气体流场均匀性调节技术的优缺点;最后指出氨喷射混合装置未来的发展趋势:①优先选用混合型喷氨格栅,分区控制式喷氨格栅和线性控制式喷氨格栅分别次之;②喷氨混合装置设计时重点寻求降低浓度不均匀系数的可行性;③研发简易、高能和稳定的静态混合结构,降低建设和运行成本,提高操作弹性;④完善还原剂氨喷射效应和喷氨量现代控制理论.
氨法選擇性催化還原技術(SCR)因其優良的綜閤性能而成為工程應用最為廣汎的煙氣脫硝工藝,而反應器橫截麵上混閤氣體流場均勻性優劣是高效煙氣脫硝的重要影響因素.本文簡述瞭SCR煙氣脫硝繫統基本原理和 NH3/NOx混閤效率指標;綜述瞭線性控製式、分區控製式和混閤型噴氨格柵等幾種工程應用上主流技術及其最新研究成果,併分析瞭各氣體流場均勻性調節技術的優缺點;最後指齣氨噴射混閤裝置未來的髮展趨勢:①優先選用混閤型噴氨格柵,分區控製式噴氨格柵和線性控製式噴氨格柵分彆次之;②噴氨混閤裝置設計時重點尋求降低濃度不均勻繫數的可行性;③研髮簡易、高能和穩定的靜態混閤結構,降低建設和運行成本,提高操作彈性;④完善還原劑氨噴射效應和噴氨量現代控製理論.
안법선택성최화환원기술(SCR)인기우량적종합성능이성위공정응용최위엄범적연기탈초공예,이반응기횡절면상혼합기체류장균균성우렬시고효연기탈초적중요영향인소.본문간술료SCR연기탈초계통기본원리화 NH3/NOx혼합효솔지표;종술료선성공제식、분구공제식화혼합형분안격책등궤충공정응용상주류기술급기최신연구성과,병분석료각기체류장균균성조절기술적우결점;최후지출안분사혼합장치미래적발전추세:①우선선용혼합형분안격책,분구공제식분안격책화선성공제식분안격책분별차지;②분안혼합장치설계시중점심구강저농도불균균계수적가행성;③연발간역、고능화은정적정태혼합결구,강저건설화운행성본,제고조작탄성;④완선환원제안분사효응화분안량현대공제이론.
Selective catalytic reduction (SCR) by ammonia process has been the most extensive engineering application of denitrification technology due to its excellent comprehensive performance. The uniformity of the mixed gas flow field ratio on the lateral section of the SCR reactor is a key factor affecting denitrification efficiency. This review represents the basic principle of SCR as well as the mixing efficiency index of NH3/NOx. The methods and recent work on mainstream technology of the engineering application were reviewed,such as linear controlled injection grid,divisional controlled injection grid,and mixed element type of injection grid. The advantages and disadvantages of different methods were analyzed. Further studies on the ammonia injection and mixing involve:①The mixed element type of injection grid is preferred,the divisional controlled and linear controlled type of injection grid take second place.②Focus on the feasibility of the lower concentration of non-uniform coefficient in the design of the mixing device.③Development of high efficiency,simple and stable hybrid element structure,reducing construction and operating costs, improving operational flexibility.④Perfection of the ammonia injection effect and modern control theory of amount.
