先进再燃技术在氧化球团工艺中的高效脱硝研究
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摘要
我国球团生产以链篦机-回转窑工艺为主,基于链篦机-回转窑氧化球团生产过程中NO_x排放浓度高的问题,结合链篦机-回转窑生产工况和先进再燃技术的机理,提出在链篦机预热二段(PH段)采用先进再燃技术脱硝,并针对某年产120万t链篦机-回转窑生产线进行了工业应用。应用结果表明,当氨氮比(NSR)为1. 5时,其废气NO_x的排放浓度从387 mg/m~3下降至265. 73 mg/m~3,NO_x年排放减少603. 31 t,脱硝效率达到了40%;同时,氨气逃逸浓度<10 ppm。此技术可作为一种理想的低氮氧化物过程控制技术。
Grate-kiln process is mainly adopted for pellet production in China,based on the problem of high NO_x emission in grate-kiln process of oxidized pellet production and in combination with the operation conditions of grate-kiln and the mechanism of advanced reburning technology,it is proposed to adopt the advanced reburning technology for denitrification in the second preheating zone of travelling grate,and its industrial application has been conducted in a 1. 2 million ton/year grate-kiln production line. The results show that,with the NSR molar ratio of 1. 5,the emission concentration of NO_x in flue gas decreases from 387 mg/m~3 to 265. 73 mg/m~3,the annual emission of NO_x decreases by 603. 31 ton,the denitrification rate reaches 40%;meanwhile,the escape concentration of ammonia is less than 10 ppm. The technology has been proved to be an ideal process control technology for low NO_x production
Grate-kiln process is mainly adopted for pellet production in China,based on the problem of high NO_x emission in grate-kiln process of oxidized pellet production and in combination with the operation conditions of grate-kiln and the mechanism of advanced reburning technology,it is proposed to adopt the advanced reburning technology for denitrification in the second preheating zone of travelling grate,and its industrial application has been conducted in a 1. 2 million ton/year grate-kiln production line. The results show that,with the NSR molar ratio of 1. 5,the emission concentration of NO_x in flue gas decreases from 387 mg/m~3 to 265. 73 mg/m~3,the annual emission of NO_x decreases by 603. 31 ton,the denitrification rate reaches 40%;meanwhile,the escape concentration of ammonia is less than 10 ppm. The technology has been proved to be an ideal process control technology for low NO_x production
引文
[1]胡兵,叶恒棣,王兆才,等.链篦机-回转窑球团NOx排放规律及控制方法[J].中国冶金,2018,28(04):66-70.
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[3]刘树根,宁平,李婷.烧结(球团)工艺过程氮氧化物产生及控制[J].四川环境,2016,35(03):17-22.
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[5] B Folsom,R Payne,D Moyeda. Advanced reburning with new process enhancements[J/OL]. https://www. osti. gov/biblio/269419,1996.
[6] Smoot L D,Hill S C,Xu H. NOxcontrol through reburning[J]. Progress in Energy&Combustion Science,1998,24(5):385-408.
[7] Zamansky V M,Maly P M,Lissianski V V. Second Generation Advanced Reburning for High Efficiency NOxControl[J].Office of Scientific&Technical Information Technical Reports,1997,14(2):111-117.
[8]高攀.先进再燃及选择性非催化脱硝优化实验与机理研究[D].济南:山东大学,2008.
[9] Lyon R K. Thermal De NOx:how it works[J]. Hydrocarbon Processing,1979,58:109-112.
[10] Lyon R K,Hardy J E. Discovery and development of the thermal De NOxprocess[J]. Ind. Eng. Chem. Fundam.;(United States),1986,25(1):19-24.
[11] Lyon R K. Thermal De NOxControlling nitrogen oxides emissions by a noncatalytic process[J]. Environmental Science&Technology,1987,21(3):231.
[2]许满兴,张玉兰.新世纪我国球团矿生产技术现状及发展趋势[J].烧结球团,2017,42(02):25-30+37.
[3]刘树根,宁平,李婷.烧结(球团)工艺过程氮氧化物产生及控制[J].四川环境,2016,35(03):17-22.
[4] Pratapas J,Bluestein J. Natural gas reburn. Cost effective NOxcontrol[J]. Power Engineering-Barrington then Tulsa-,1994,98:5.
[5] B Folsom,R Payne,D Moyeda. Advanced reburning with new process enhancements[J/OL]. https://www. osti. gov/biblio/269419,1996.
[6] Smoot L D,Hill S C,Xu H. NOxcontrol through reburning[J]. Progress in Energy&Combustion Science,1998,24(5):385-408.
[7] Zamansky V M,Maly P M,Lissianski V V. Second Generation Advanced Reburning for High Efficiency NOxControl[J].Office of Scientific&Technical Information Technical Reports,1997,14(2):111-117.
[8]高攀.先进再燃及选择性非催化脱硝优化实验与机理研究[D].济南:山东大学,2008.
[9] Lyon R K. Thermal De NOx:how it works[J]. Hydrocarbon Processing,1979,58:109-112.
[10] Lyon R K,Hardy J E. Discovery and development of the thermal De NOxprocess[J]. Ind. Eng. Chem. Fundam.;(United States),1986,25(1):19-24.
[11] Lyon R K. Thermal De NOxControlling nitrogen oxides emissions by a noncatalytic process[J]. Environmental Science&Technology,1987,21(3):231.