Abstract：As one of the typical new non-blast furnace ironmaking processes and technologies, fluidized ironmaking process can not only promote energy conservation and emission reduction, reduce the cost of ironmaking, but also promote the low-carbon green sustainable development of the iron and steel industry. Reduction gas utilization rate is one of the key parameters of fluidized ironmaking reduction process, which directly affects the industrial application of new ironmaking technology. Based on the thermodynamic analysis of the reduction of iron oxide by CO and H2 mixed gas, the variation rule of gas utilization rate in the fluidized reduction process of iron ore fines was studied by using the fluidization reduction experiment method. The fluidization reduction experiment of iron ore fines was carried out by using the micro-fluidized bed system. 40 mg Brazilian iron ore fines were completely reduced in the fluidization state to study the influence of reaction temperature, particle size of ore fines, gas flow rate and gas mixture ratio on the reduction gas utilization rate in the experiment process. The results show that under the experimental conditions, reducing the reaction temperature and particle size of ore fines would be beneficial to the increase of CO gas utilization rate. With the increase of the gas flow rate, the CO utilization rate shows a trend of firstly increased and then decreased. Changing the ratio of CO to H2 also has a similar situation that the CO utilization rate increased first and then dropped sharply with the increase of the CO ratio, and reached the maximum value when the CO gas flow rate was 400 mL/min and volume percent of CO is 50%. Therefore, for the fluidization pre-reduction process, the proportion of H2 should be considered to determine the appropriate gas flow rate, and the thermodynamic and kinetic conditions of reduction should be improved to increase the utilization rate of reduced gas as much as possible. The research results can deepen the understanding of the reduction behavior of fluidized gas, and provide a certain theoretical support for the selection of process parameters and reactor design for the engineering application of the new fluidized ironmaking process.
祝明妹, 郑忠, 唐则吉, 许玉忠, 何徐. 铁矿粉流态化还原气体利用率[J]. 钢铁, 2023, 58(7): 17-26.
ZHU Mingmei, ZHENG Zhong, TANG Zeji, XU Yuzhong, HE Xu. Gas utilization rate of iron ore fines fluidized reduction[J]. Iron and Steel, 2023, 58(7): 17-26.
[1] 张建良,李克江,刘征建,等. 氢冶金初探[M].北京:冶金工业出版社,2021.(ZHANG J L, LI K J, LIU Z J, et al. A Preliminary Study of Hydrogen Metallurgy[M]. Beijing: Metallurgical Industry Press, 2021.) [2] 潘聪超,庞建明.氢冶金技术的发展溯源与应用前景[J].中国冶金,2021,31(9):73 .(PAN C C, PANG J M. Development trace and application prospect of hydrogen metallurgy technology[J].China Metallurgy,2021,31(9):73 .) [3] 储满生,柳政根,唐珏. 低碳炼铁技术[M]. 北京:冶金工业出版社,2021.(CHU M S, LIU Z G, TANG J. Low-carbon Ironmaking Technology[M]. Beijing:Metallurgical Industry Press, 2021.) [4] 张福明,刘清梅.高炉-转炉钢铁制造流程低碳技术发展与认识[J].中国冶金,2023,33(1):1.(ZHANG F M, LIU Q M. Development and understanding on low carbon technology based on BF-BOF steel manufacturing processes[J]. China Metallurgy, 2023,33(1):1.) [5] 宋晓然,刘征建,张建良等.等离子体氢还原铁氧化物的研究进展[J].中国冶金,2022,32(12):7.(SONG X R, LIU Z J, ZHANG J L, et al. Research progress of plasma hydrogen reduction of iron oxide[J]. China Metallurgy, 2022,32 (12): 7.) [6] 于洪军,路明,王兴锋,等.铁矿粉粒度组成对球团矿性能影响的研究进展[J].冶金能源,2022,41(1):21.( YU H J,LU M,WANG X F, et al. Research progress on the effect of iron fine particle size on pellet properties[J].Energy for Metallurgical Industry,2022,41(1):21. [7] 赵沛,郭培民,张殿伟.低温非平衡条件下氧化铁还原顺序研究[J].钢铁,2006,41(8):12.(ZHAO P, GUO P M, ZHANG D W. Study on reduction sequence of hematite at low-te mperature non-equilibrium state[J]. Iron and Steel, 2006,41(8): 12.) [8] 庞建明,郭培民,赵沛,等.低温下氢气还原氧化铁的动力学研究[J].钢铁,2008,43(7):7.(PANG J M, GUO P M, ZHAO P, et al. Study on kinetics of hematite reduction by hydrogen at low temperature[J]. Iron and Steel, 2008,43 (7):7.) [9] 陈小敏,湛文龙,杜晓东,等.烧结矿在高炉内熔滴性能新方法表征与预测的研究[J].冶金能源,2022,41(2):29.(CHEN X M,ZHAN W L,DU X D,et al. Investigation on a new method for predicting and characterizing the melting property of sinter in blast furnace[J].Energy for Metallurgical Industry,2022,41(2):29. ) [10] 王兆才,陈双印,储满生,等.煤制气-竖炉生产直接还原铁浅析[J].中国冶金,2013,23(1):20.(WANG Z C, CHEN S Y, CHU M S, et al. Tentative study on direct reduction iron production by gasfication-shaft furnace[J]. China Metallurgy, 2013,23(1): 20.) [11] 郑少波,孙克强,郝学彬等.氢碳熔融还原动力学试验研究[J].中国冶金,2013,23(1):15.(ZHENG S B, SUN K Q, HAO X B, et al. Kinetics test of hydrogen-carbon smelting reduction[J]. China Metallurgy, 2013,23 (1): 15.) [12] 郑少波.氢冶金基础研究及新工艺探索[J].中国冶金,2012,22(7):1.(ZHENG S B. Basic research and new process exploration of hydrogen metallurgy[J]. China Metallurgy, 2012,22 (7): 1.) [13] 李秋菊,王道净,洪新.氧化铁矿微粉气相还原机理研究[J].钢铁,2008,43(7):22.(LI Q J, WANG D J, HONG X. Gas reduction mechanism of microscale iron oxide powders [J]. Iron and Steel, 2008,43 (7): 22.) [14] 杨双平,于成刚,何少红,等.铁矿粉化学成分对烧结高温基础特性的影响[J].中国冶金,2023,33(2):47. (YANGS P, YUC C, HES H,et al. Influence of chemical composition in iron ore powder on basic characteristics of sintering at high temperature[J] .China Metallurgy, 2023,33(2):47. [15] 单长冬,张建良,刘征建,等.铁矿粉烧结基础特性之同化性研究进展[J].中国冶金,2022,32(12):1 . (SHAN C D, ZHANGJ L, LIU Z J,et al.Research progress on assimilation property in basic sintering characteristics of iron ore powder[J] .China Metallurgy,2022,32(12):1.) [16] 应自伟,储满生,唐珏,等.非高炉炼铁工艺现状及未来适应性分析[J].河北冶金,2019(6):1.(YING Z W, CHU M S, TANG J,et al. Current situation and future adaptability analysis of non-blast furnace ironmaking process[J]. Hebei Metallurgy, 2019(6):1.) [17] 郭培民, 庞建明, 赵沛,等. 氢气还原1～3 mm铁矿粉的动力学研究[J]. 钢铁, 2010,45(1):19.(GUO P M, PANG J M, ZHAO P, et al. Reduction kinetics of 1-3 mm ore fines with H2[J]. Iron and Steel,2010,45(1):19.) [18] 陈健,苏敏,张新波,等.氢冶金还原性气体的制备研究进展[J].中国冶金,2023,33(1):24.(CHEN J,SU M , ZHANGX B,et al. Research progress in preparation of reducing gases for hydrogen metallurgy[J] .China Metallurgy ,2023,33(1):24. [19] 陈红生, 郑忠, 张宇涛,等. 流化床中铁矿粉预还原条件对终还原影响的实验研究[J]. 过程工程学报, 2013, 13(6):980. (CHEN H S,ZHENG Z,ZHANG Y T,et al.Experimental Study on the effects of iron ore powder pre-reduction conditions on final reduction in a fluidized bed[J]. Journal of Process Engineering, 2013, 13(6):980.) [20] CHEN H, ZHENG Z, CHEN Z, et al. Reduction of hematite (Fe2O3) to metallic iron (Fe) by CO in a micro fluidized bed reaction analyzer: A multistep kinetics study[J]. Powder Technology, 2017,316(17):410. [21] CHEN H, ZHENG Z, CHEN Z, et al. Multistep reduction kinetics of fine iron ore with carbon monoxide in a micro fluidized bed reaction analyzer[J]. Metallurgical and Materials Transactions B, 2017,48 (2):841. [22] YI L Y, HUANG Z C, PENG H,et al. Action rules of H2 and CO in gas-based direct reduction of iron ore pellets[J]. Journal of Central South University, 2012, 19(8): 2291. [23] WANG Z C, LIU Z G, TANG J, et al. Analysis of gas thermodynamic utilization and reaction kinetic mechanism in shaft furnace[J]. Journal of Iron and Steel Research International, 2014 21(1): 16. [24] 李彬,郭汉杰,郭靖,等. 基于最小 Gibbs 自由能原理的铁氧化物气固还原热力学研究[J]. 工程科学学报,2017, 39(11): 1653.(LI B, GUO H J, GUO J, et al. Thermodynamics of iron oxide gas-solid reduction based on the minimized Gibbs free energy principle[J]. Journal of Engineering Science,2017, 39(11): 1653.) [25] WEISS B, STURN J, WINTER F, et al. Empirical reduction diagrams for reduction of iron ores with H2 and CO gas mixtures considering non-stoichiometries of oxide phases[J]. Ironmaking and Steelmaking, 2009,36(3):212. [26] BILIK J, PUSTEJOVSKA P, BROZOVA S, et al. Efficiency of hydrogen utilization in reduction processes in ferrous metallurgy[J]. Scientia Iranica B, 2013,20(2):337. [27] 肖玮, 鲁雄刚, 邹星礼, 等. 富氢气基还原钛铁矿及其气相组分的耦合作用[J]. 中国有色金属学报, 2013,23(12):3423.(XIAO W, LU X G, ZOU X L, et al. Hydrogen-rich gas reduction of ilmenite and coupling reaction of gaseous compositions[J]. Chinese Journal of Nonferrous Metals, 2013,23(12):3423.) [28] 庞建明, 郭培民, 赵沛. 流化床中CO还原1～3 mm铁矿粉研究[J]. 钢铁钒钛, 2010,31(3):15.(PANG J M, GUO P M, ZHAO P. Study on the reduction of 1-3 mm iron ore powder by co in fluidized bed[J]. Steel Vanadium Titanium, 2010,31(3):15.) [29] 郭培民, 赵沛, 王磊, 等. 移动床内氧化铁还原及还原气体氧化行为分析[J]. 钢铁研究学报, 2018,30(5):348. (GUO P M,ZHAO P,WANG L, et al. Analysis of reduction of iron ore and oxidation of reducing gas in moving bed[J]. Journal of Iron and Steel Research, 2018,30(5):348.) [30] 郭培民, 赵沛, 王磊, 等. 氧化铁气基还原过程的气体氧化动力学[J]. 钢铁, 2017,52(9):22.(GUO P M,ZHAO P,WANG L, et al. Oxidizing kinetics of reducing gas during iron oxide reduction process[J].Iron and Steel, 2017,52(9):22.) [31] LÜ Q, QIE Y, LIU X, et al. Effect of hydrogen addition on reduction behavior of iron oxides in gas-injection blast furnace[J]. Thermochimica Acta, 2017,648(16):79. [32] PARK T J, LEE J H, KIM D G, et al. Estimation of the H2 gas utilization ratio using a BF shaft inner reaction simulator[J]. Metallurgical and Materials Transactions B, 2020,51(2):417. [33] WANG F, ZENG X, SHAO R, et al. Isothermal gasification of in situ/ex situ coal char with CO2 in a micro fluidized bed reaction analyzer[J]. Energy and Fuels, 2015, 29(8): 4795. [34] 黄希祜. 钢铁冶金原理[M]. 4版. 北京: 冶金工业出版社, 2013.(HUANG X H. Principles of Iron and Steel Metallurgy[M]. Beijing: Metallurgical Industry Press, 2013.) [35] CHEN H, ZHENG Z, SHI W. Investigation on the kinetics of iron ore fines reduction by CO in a micro-fluidized bed[J]. Procedia Engineering, 2015, 102: 1726. [36] 庞建明, 郭培民, 赵沛, 等. 氢气还原氧化铁动力学的非等温热重方法研究[J]. 钢铁, 2009, 44(2): 11.(PANG J M, GUO P M, ZHAO P, et al. Kinetics of reduction of hematite by H2 using nonisothermal thermogravimetric method[J]. Iron and Steel,2009, 44(2): 11.) [37] TURKDOGAN E T, VINTERS J V. Gaseous reduction of iron oxides: Part I. Reduction of hematite in hydrogen[J]. Metallurgical and Materials Transactions B, 1971, 2(11):3175.
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