Analysis of affecting factors of activated coke denitrationefficiency for sintering flue gas
ZHANG Wei-li1, WU Sheng-li1, HU Zhong-jie1,2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Iron Plant, Baoshan Iron and Steel Co., Ltd., Shanghai 201900, China
Abstract：In order to clarify the denitration performance changes of activated coke during the recycling process in the sintering flue gas purification system and the main operating parameters affecting the denitration rate of sintering flue gas,to improve the purification efficiency of sintering flue gas by activated coke method,FTIR and simulation experiments were carried out to study the changes of activated coke property and its effect on denitration efficiency during recycling. The main process parameters affecting the activated coke denitration efficiency for sintering flue gas and its influence law were clarified through statistical analysis of production data. The results show the quantity of phenol and quinine on activated coke increase after recycling,hence the NO adsorption capacity decreases,which leads to the decrease of initial denitration efficiency of active coke. While the pre-adsorption of ammonia can greatly increase the initial denitration efficiency,it can be deduced that the denitration efficiency from top to bottom of cross-flow denitration tower experienced 100%,rapid decreasing,slow rising until equilibrium. Secondly,denitration efficiency is positively correlated with the NH3-NOx ratio,O2 volume percent,NOx mass concentration,and desorption temperature,and negatively correlated with the H2O volume percent,SO2 mass concentration,flue gas flow,and activated carbon bed temperature. Besides,NH3-NOx ratio,O2 volume percent,and NOx mass concentration have great influence on the denitration efficiency,which should be focused on in the parameter optimization process.
[1] 王锋,张俊,郄俊懋,等. 烧结机风箱中烟气排放规律及分析[J]. 钢铁,2019,54(6):96. (WANG Feng,ZHANG Jun,QIE Jun-mao. Emission law and analysis of flue gas in sinter wind boxes[J]. Iron and Steel,2019,54(6):96.) [2] 李新创. 新时代钢铁工业高质量发展之路[J]. 钢铁,2019,54(1):1. (LI Xing-chuang. Road map to high-quality development of iron and steel industry in new age[J]. Iron and Steel,2019,54(1):1.) [3] 于勇,朱廷钰,刘霄龙. 中国钢铁行业重点工序烟气超低排放技术进展[J]. 钢铁,2019,54(9):1. (YU yong,ZHU Ting-yu,LIU Xiao-long. Progress of ultra-low emission technology for key processes of iron and steel industry in China[J]. Iron and Steel,2019,54(9):1.) [4] 阮志勇. 铁矿烧结烟气氧化-氨法协同脱硫脱硝[J]. 中国冶金,2018,28(5):72. (RUAN Zhi-yong. Simultaneously desulfurization and denitration of iron ore sintering flue gas based on pre-oxidized and ammonia process[J]. China Metallurgy,2018,28(5):72.) [5] 汪庆国,朱彤,李勇. 宝钢烧结烟气活性炭净化工艺和装备[J]. 钢铁,2018,53(3):87. (WANG Qing-guo,ZHU Tong,LI Yong. Sinering flue gas purifying process and equipment by use of activated coke in Baosteel[J]. Iron and Steel,2018,53(3):87. [6] TANG Q,ZHANG Z G,ZHU W P,et al. SO2 and NO selective adsorption properties of coal-based activated carbons[J]. Fuel,2005,84(4):461. [7] Knoblauch K,Richter E,Jüntgen H. Application of active coke in processes of SO2 and NOx removal from flue gases[J]. Fuel,1981,60(9):832. [8] 傅月梅,潘敏,张九杉,等. 活性焦烟气脱硝影响因素研究[J]. 洁净煤技术,2015,21(4):122. (FU Yue-mei,PAN Min,ZHANG Jiu-shan,et al. Influencing factors of denitrification technology by activated coke[J]. Clean Coal Technology,2015,21(4):122.) [9] 李兵,张立强,蒋海涛,等. 活性炭孔隙结构和表面化学性质对吸附氧化NO的影响[J]. 煤炭学报,2011,36(11):1905.(LI Bing,ZHANG Li-qiang,JIANG Hai-tao,et al. Effect of pore structure and surface chemical properties of activated carbon on the adsorption and oxidation of NO[J]. Journal of China Coal Society,2011,36(11):1905.) [10] 李兰廷. 活性焦干法联合脱硫脱硝的正交实验[J]. 煤炭学报,2009,34(10):1400.(LI Lan-ting. Orthogonal test on combined desulphurization and denitrification by activated char[J]. Journal of China Coal Society,2009,34(10):1400.) [11] LI Y R,GUO Y Y,ZHU T Y,et al. Adsorption and desorption of SO2,NO,and chlorobenzene on activated carbon[J]. Journal of Environmental Sciences,2016,43(5):128. [12] Figueiredo J L,Pereira M F R,Freitas M M A,et al. Modification of the surface chemistry of activated carbons[J]. Carbon,1999,37(9):1379. [13] Jastrzab K. Change of activated coke properties in cyclic adsorption treatment of flue gases[J]. Fuel Processing Technology,2012,104:371. [14] Ogriseck S,Vanegas G. Experimental investigations of ammonia adsorption and nitric oxide reduction[J]. Chemical Engineering Journal,2010,160(2):641. [15] ZHU Z P,LIU Z Y,LIU S J,et al. Adsorption and reduction of NO over activated coke at low temperature[J]. Fuel,2000,79(6):651. [16] Dumesic J A,Topse N Y,Topse H,et al. Kinetics of selective catalytic reduction of nitric oxide by ammonia over vanadia/titania[J]. Journal of Catalysis,1996,163(2):409. [17] Zhang W J,Rabiei S,Bagreev A,et al. Study of NO adsorption on activated carbons[J]. Applied Catalysis B:Environmental,2008,83(1):63. [18] 刘爱玉. SPSS基础分析教程[M]. 北京:北京大学出版社,2014.(LIU Ai-yu. Introduction to Basic Analysis Using SPSS[M]. Beijing:Peking University Press,2014.) [19] WU S L,WANG L X,KOU M Y,et al. Analysis of operational parameters affecting the sulfur content in hot metal of corex process[J]. Metallurgical and Materials Transactions B,2017,48(1):276. [20] Mochida I,Kisamori S,Hironaka M,et al. Oxidation of NO into NO2 over active carbon fibers[J]. Energy Fuels,1994,8(6):611. [21] 郭汉杰. 冶金物理化学[M]. 2版. 北京:冶金工业出版社,2006.(GUO Han-jie. Metallurgical Physical Chemistry[M]. 2nd ed. Beijing:Metallurgical Industry Press,2006.) [22] 郭占成. 活性炭选择性催化还原(SCR)烟道气中NOx[J]. 环境工程,1999,17(4):35.(GUO Zhan-cheng. Activated carbon selective catalytic reduction (SCR) NOx in flue gas[J]. Environmental Engineering,1999,17(4):35.) [23] 李雪飞. 改性活性炭脱除烟气中NOx研究[D]. 北京:北京煤化工研究分院,2006.(LI Xue-fei. Reduction of NOx from Flue Gas with Modified Activated Carbon[D]. Beijing:Beijing Coal Chemical Research Branch,2006.) [24] Mochida I,Korai Y,Shirahama M,et al. Removal of SO2 and NO over activated carbon fibers[J]. Carbon,2000,38(2):227. [25] 熊银伍,徐振刚,梁大明,等. 烟气联合脱硫脱硝活性焦再生实验研究[J]. 煤炭学报,2011,36(6):1004.(XIONG Yin-wu,XU Zhen-gang,LIANG Da-ming,et al. Experimental study on regeneration of activated char after combined removal of SO2 and NO in flue gas[J]. Journal of China Coal Society,2011,36(6):1004.) [26] Rubel A M,Stencel J M. The effect of low concentration SO2 on the adsorption of NO from gas over activated carbon[J]. Fuel,1997,76(6):521.
2020, Vol. 55 
