解析参数对活性焦再生过程及再生效果的影响

doi:10.13228/j.boyuan.issn0449-749x.20220051

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Abstract The thermal desorption parameters of activated coke are crucial to the desulfurization and denitrification performance and mechanical strength of regenerated activated coke. In order to clarify the influence of desorption parameters on the regeneration process and regeneration effect of activated coke, the effects of desorption temperature and desorption time on the residual ratio of desulfurization product in activated coke, the amount of CO₂ and CO generated, and the desulfurization and denitrification performance of regenerated activated coke were investigated through thermal desorption experiments to determine the appropriate thermal desorption parameters of activated coke. The results show that the desulfurization products are rapidly decomposed at around 317 ℃ in the process of activated coke thermal desorption, and then the decomposition rate drops rapidly. After entering the constant temperature desorption stage, the decomposition rate of desulfurization products first decreases rapidly and then enters a slow desorption state, and the residual sulfur ratio decreases with the increase of constant temperature desorption temperature. The residual sulfur ratio decreases with the increase of constant temperature desorption temperature, and desulfurization products can be completely resolved at 530 ℃ for 3 h. When the desorption temperature is higher than 430 ℃, the decomposition amount of oxygen-containing functional groups, such as phenolic, quinone, lactone, on the surface of activated coke increases significantly, and continues to increase with the increase of constant desorption temperature. And the amount of CO₂ and CO generation will also increase significantly, which will further develop the pore structure of the activated coke, which is not conducive to the maintenance of mechanical strength of the activated coke. When the desorption temperature is lower than 530 ℃, the residual sulfur ratio continues to decrease with the increase of desorption temperature, so that the desulfurization and denitrification performance of the regenerated activated coke continues to be improved. After the desorption temperature is higher than 530 ℃, the decomposition amount of oxygen-containing functional groups continues to increase with the increase of desorption temperature, which will help to improve the SO₂ oxidation reaction rate on the surface of activated coke, and then the desulfurization performance of regenerated activated coke will continue to increase. The decomposition of acidic oxygen-containing functional groups such as phenolic and lactone groups reduces the adsorption performance of regenerated activated coke for NH₃, thereby reducing its denitration performance. When considering various factors such as desulfurization and denitrification performance, mechanical strength and production efficiency of regenerated activated coke, constant temperature analysis at 430 ℃ for 3 h is a relatively optimal desorption parameter. Under these conditions, the residual sulfur ratio is only 1.8%, the oxygen-containing functional groups have not been decomposed in large quantities, and the desulfurization and denitrification performance of regenerated activated coke is relatively good.

Key words： sintering flue gas purification activated coke regeneration desulfurization and denitrification process parameters residual sulfur ratio oxygen-containing functional group

Received: 17 January 2022

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	Articles by authors
	QIAO Li-zhu
	ZHANG Wei-li
	PENG Han-zhong
	WU Sheng-li

Cite this article:

QIAO Li-zhu,ZHANG Wei-li,PENG Han-zhong等. Influence of desorption parameters on regeneration process and regeneration effect of activated coke[J]. Iron and Steel, 2022, 57(6): 159-166.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220051 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I6/159

[1] 张建良,尉继勇,刘征建,等. 中国钢铁工业空气污染物排放现状及趋势[J]. 钢铁,2021,56(12):1. (ZHANG Jian-liang,WEI Ji-yong,LIU Zheng-jian,et al. Current situation and trend of air pollutant emission in China′s steel industry[J]. Iron and Steel,2021,56(12):1.)
[2] 罗云飞,杨涛,周江虹,等. 料面喷吹蒸汽对烧结矿产质量和CO排放的影响[J]. 钢铁,2021,56(11):47.(LUO Yun-fei,YANG Tao,ZHOU Jiang-hong,et al. Effect of steam injection from material surface on output and quality of sinter and CO emissions[J]. Iron and Steel,2021,56(11):47.)
[3] 范晓慧,甘敏,季志云,等. 复合气体介质烧结的节能减排技术开发与应用[J]. 钢铁,2020,55(8):62.(FAN Xiao-hui,GAN Ming,JI Zhi-yun,et al. Development and application of techniques for energy conservation and emission reduction during sintering process based on multiple-component gases medium[J]. Iron and Steel,2020,55(8):62.)
[4] 甘敏,朱亮,范晓慧,等. 链箅机铁矿球团料层催化脱硝的反应行为及影响因素[J]. 钢铁,2021,56(12):36.(GAN Min,ZHU Liang,FAN Xiao-hui,et al. Reaction behavior and influencing factors of catalytic denitration of iron are pellets in chain grate[J]. Iron and Steel,2021,56(12):36.)
[5] 王新东,以“绿色化、智能化、品牌化”为目标规划设计河钢唐钢新区[J].钢铁,2021,56(2):12.(WANG Xin-dong,Planning and design of HBIS Group Tangsteel new district with goal of “Green, Intelligent, and Brand”[J]. Iron and Steel,2021,56(2):12.)
[6] 吴胜利,阙志刚,艾仙斌. 基于调控含钙化合物反应行为的烧结过程NO_x减排研究进展[J]. 钢铁,2020,55(3):1.(WU Sheng-li,QUE Zhi-gang,AI Xian-bin. Research process on regulating reaction behaviors of calcium-containing compounds for reducing NO_x emission in sintering process[J]. Iron and Steel,2020,55(3):1.)
[7] 陈许玲,郑如月,范晓慧,等. 烟气循环烧结过程料层温度及NO_x排放模拟模型[J]. 钢铁,2020,55(2):23.(CHEN Xu-ling,ZHENG Ru-yue,FAN Xiao-hui,et al. Numerical simulation model of temperature and NO_x emission in flue gas circulating sintering process[J]. Iron and Steel,2020,55(2):23.)
[8] 万军营,陈铁军,周仙霖,等. 混合料预先干燥对烧结NO_x排放的影响[J]. 钢铁,2020,55(7):41.(WANG Jun-ying,CHEN Tie-jun,ZHOU Xian-lin,et al. Effect of pre-drying of mixture on emission of NO_x in sintering process[J]. Iron and Steel,2020,55(7):41.)
[9] 周茂军,张代华. 宝钢烧结烟气超低排放技术集成与实践[J]. 钢铁,2020,55(2):144.(ZHOU Mao-jun,ZHANG Dai-hua. Technology integration and practice of ultra-low emission of sintering flue gas in Baosteel[J]. Iron and Steel,2020,55(2):144.)
[10] 阮志勇. 烧结烟气氨法联合活性炭协同脱硫脱硝[J]. 钢铁,2017,52(12):91.(RUAN Zhi-Yong,desulfurization and denitration of sintering flue gas based on ammonia and activated carbon process[J]. Iron and Steel,2017,52(12):91.)
[11] 张威力,吴胜利,胡中杰. 活性焦法烧结烟气脱硝率影响因素解析[J]. 钢铁,2020,55(5):109.(ZHANG Wei-li,WU Sheng-li,HU Zhong-jie. Analysis of affecting factors of activated coke denitration efficiency for sintering flue gas[J]. Iron and Steel,2020,55(5):109.)
[12] 张威力,吴胜利,胡中杰. 活性焦法烧结烟气脱硫率影响因素统计解析[J]. 钢铁研究学报,2020,32(4):281.(ZHANG Wei-li,WU Sheng-li,HU Zhong-jie. Statistical analysis of factors affecting desulfurization rate of activated coke for sintering flue gas[J]. Journal of Iron and Steel Research,2020,32(4):281.)
[13] WU Sheng-li,ZHANG Wei-li,HU Zhong-jie, et al. Properties change of activated coke for sintering clue gas purification in cyclic removal of SO₂ and NO_x[J]. Journal of Iron and Steel Research International,2021,28(6):641.
[14] Marchon B,Carrazza J,Heinemann H,et al. TPD and XPS studies of O₂,CO₂,and H₂O adsorption on clean polycrystalline graphite[J]. Carbon,1988. 26(4):507.
[15] Zielke U,Huttinger K J,Hoffman W P. Surface-oxidized carbon fibers: I. Surface structure and chemistry [J]. Carbon,1996,34(8),983.
[16] Montoya A, Truong T N, Sarofim A F. Application of density functional theory to the study of the reaction of NO with char-bound nitrogen during combustion[J]. The Journal of Physical Chemistry A, 2000, 104(36): 8409.
[17] Zhuang Q,Kyotani T,Tomita A. Dynamics of surface oxygen complexes during carbon gasification with oxygen[J]. Fuel and Energy Abstracts,1995,38(4):630.
[18] Mochida I, Korai Y, Shirahama M, et al. Removal of SO_x and NO_x over activated carbon fibers[J]. Carbon, 2000, 38(2): 227.
[19] Lizzio A A, DeBarr J A. Effect of surface area and chemisorbed oxygen on the SO₂ adsorptiorn capacity of activated char[J]. Fuel, 1996, 75(13): 1515.