Solution loss characteristics of cokes in H2O+CO2 atmosphere

DOU Ming-hui; SUN Yang; HAN Jia-wei; SUN Zhang; LIANG Ying-hua

doi:10.13228/j.boyuan.issn0449-749x.20210775

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Iron and Steel ›› 2022, Vol. 57 ›› Issue (7) : 26-33. DOI: 10.13228/j.boyuan.issn0449-749x.20210775

Raw Material and Ironmaking

Solution loss characteristics of cokes in H₂O+CO₂ atmosphere

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Abstract

To study the solution-loss reaction characteristics of cokes in hydrogen-rich blast furnace, a homemade coke reactivity measurement device with continuous water inflow was developed to carry out coke solution-loss experiments by CO₂ (N₂) carrying H₂O vapor with different percentages (0-30%), which provided H₂O+CO₂(gas mixture of H₂O and CO₂)and H₂O+N₂(gas mixture of H₂O and N₂)atmosphere. The Boudouard reaction(C+CO₂=2CO)kinetics and water gas (C+H₂O=CO+H₂)reaction kinetics of cokes in H₂O+CO₂ atmosphere were studied using real-time recording the mole percent of CO and H₂ in the outlet gas through infrared gas analyzers. The results show that carbon loss ratio and solution-loss rate of cokes increase with the increase of H₂O percentage in the H₂O+CO₂reaction atmosphere. Furthermore, with the increase of H₂O percentage the water gas reaction rate and carbon loss ratio increase gradually, while the Boudouard reaction rate and carbon loss ratio decrease gradually, which indicates that there is a strong competition between the reactions of H₂O and CO₂ with coke. The analysis for fitting slopes of linear relationship between carbon loss rate and H₂O percentage shows that the slopes of the Boudouard reaction and water gas reaction for cokes in H₂O+CO₂ atmosphere are less than the ones in single atmosphere, and an inhibition factor (α) based on the difference of reaction rate constant is proposed to evaluate the degree of inhibition, which can characterize the influence degree of interaction for H₂O and CO₂ on carbon dissolution reaction and water gas reaction. The inhibition factor α_<sub>CO₂/H₂O of CO₂ to water gas reaction is 0.253, and the inhibition factor α_<sub>H₂O/CO₂of H₂O to Boudouard reaction is 0.179. α_<sub>CO₂/H₂O: α_<sub>H₂O/CO₂ is 1.41. The inhibition degree of CO₂ on water gas reaction is stronger than that of H₂O on carbon solution reaction.

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coke / solution-loss reaction / H₂O+CO₂ atmosphere / competition / inhibition factor

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DOU Ming-hui, SUN Yang, HAN Jia-wei, et al. Solution loss characteristics of cokes in H₂O+CO₂ atmosphere[J]. Iron and Steel, 2022, 57(7): 26-33 https://doi.org/10.13228/j.boyuan.issn0449-749x.20210775

References

[1] 张琦, 沈佳林, 许立松. 中国钢铁工业碳达峰及低碳转型路径[J]. 钢铁, 2021, 56(10): 152.(ZHANG Qi, SHEN Jia-lin, XU Li-song. Carbon peak and low-carbon transition path of China's iron and steel industry[J]. Iron and Steel, 2021, 56(10): 152.)
[2] 张龙强, 陈剑. 钢铁工业实现“碳达峰”探讨及减碳建议[J]. 中国冶金, 2021, 31(9): 21.(ZHANG Long-qiang, CHEN Jian. Discussion on achieving "carbon peak" and suggestions for reducing carbon in iron and steel industry[J]. China Metallurgy, 2021, 31(9): 21.)
[3] 徐匡迪. 低碳经济与钢铁工业[J]. 钢铁, 2009, 45(3): 1.(XU Kuang-di. Low carbon economy and iron and steel industry[J]. Iron and Steel, 2009, 45(3): 1.)
[4] 孙敏敏, 宁晓钧, 张建良, 等. 炼铁系统节能减排技术的现状和发展[J]. 中国冶金, 2018, 28(3): 1.(SUN Min-min, NING Xiao-jun, ZHANG Jian-liang, et al. Research status and progress of energy saving and emission reduction technology for ironmaking[J]. China Metallurgy, 2018, 28(3): 1.)
[5] 张福明. 首钢绿色低碳炼铁技术的发展与展望[J]. 钢铁, 2020, 55(8): 11.(ZHANG Fu-ming. Development and prospect of green low carbon ironmaking technologies in Shougang[J]. Iron and Steel, 2020, 55(8): 11.)
[6] 王广, 王静松, 左海滨, 等. 高炉煤气循环耦合富氢对中国炼铁低碳发展的意义[J]. 中国冶金, 2019, 29(10): 1.(WANG Guang, WANG Jing-song, ZUO Hai-bin, et al. Effect of blast furnace gas recycling with hydrogen injection on low carbon development of Chinese ironmaking[J]. China Metallurgy, 2019, 29(10): 1.)
[7] 毕传光, 唐珏, 储满生. 梅钢2号高炉喷吹焦炉煤气数值模拟[J]. 钢铁, 2018, 53(4): 89.(BI Chuan-guang, TANG Yu, CHU Man-sheng. Mathematical modeling of Mei Steel No. 2 BF with coke oven gas injection[J]. Iron and Steel, 2018, 53(4): 89.)
[8] 刘颂, 吕庆, 张旭升, 等. 高炉喷吹煤气工艺中炉顶煤气循环的变化规律[J]. 钢铁, 2018, 53(2): 78.(LIU Song, LÜ Qing, ZHANG Xu-sheng, et al. Change rule of top gas circulation in blast furnace gas injection process[J]. Iron and Steel, 2018, 53(2): 78.)
[9] QIE Ya-na, LÜ Qing, LI Jian-peng, et al. Effect of hydrogen addition on reduction kinetics of iron oxides in gas-injection BF[J]. ISIJ International, 2017, 57(3): 404.
[10] 吕庆, 李福民, 李秀兵, 等. 高炉喷吹煤气后固体炉料的还原与变化[J]. 钢铁, 2008, 43(1): 17.(LÜ Qing, LI Fu-min, LI Xiu-bing, et al. Influence of gas-Injection from tuyeres on reduction and transformation of solid charge in blast furnace[J]. Iron and Steel, 2008, 43(1): 17.)
[11] 李福民, 吕庆, 李秀兵. 高炉喷吹煤气对成渣过程的影响[J]. 钢铁, 2007, 42(5): 12.(LI Fu-min, LÜ Qing, LI Xiu-bing. Influence of gas injection from tuyeres on slag formation in blast furnace[J]. Iron and Steel, 2007, 42(5): 12.)
[12] GUO Tong-lai, CHU Man-sheng, LIU Zheng-gen, et al. Mathematical modeling and exergy analysis of blast furnace operation with natural gas injection[J]. Steel Research International, 2013, 84(4): 333.
[13] 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 Shao-bo. Basic research on hydrogen metallurgy and new ironmaking idea-process[J]. China Metallurgy, 2012, 22(7): 1.)
[14] 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 Cong-chao, PANG Jian-ming. Development trace and application prospect of hydrogen metallurgy technology[J]. China Metallurgy, 2021, 31(9): 73. )
[15] 兰臣臣, 刘然, 张淑会, 等. 高炉内H₂体积分数对焦炭气化反应的影响[J]. 钢铁, 2020, 55(8): 100.(LAN Chen-chen, LIU Ran, ZAHNG Shu-hui, et al. Effect of H₂volume percent on gasification reaction of coke in blast furnace[J]. Iron and Steel, 2020, 55(8): 100.)
[16] LAN Chen-chen, ZHANG Shu-hui, LIU Xiao-jie, et al. Gasification behaviors of coke in a blast furnace with and without H₂[J]. ISIJ International, 2021, 61(1): 158.
[17] 王煜, 何志军, 湛文龙, 等.富氢气氛下不同含铁炉料的还原行为[J]. 钢铁, 2020, 55(7): 34.(WANG Yu, HE Zhi-jun, ZHAN Wen-long, et al. Reduction behavior of iron-bearing burdens in hydrogen-rich stream[J]. Iron and Steel, 2020, 55(7): 34.)
[18] WANG Ping, ZHANG Yue-qiang, LONG Hong-min, et al. Degradation behavior of coke reacting with H₂O and CO₂ at high temperature[J]. ISIJ International, 2017, 57(4): 643.
[19] 王平, 张越强, 李家新, 等. CO₂与水蒸汽对焦炭溶损反应的影响[J]. 过程工程学报, 2016, 16(1): 138.(WANG Ping, ZHANG Yue-qiang, LI Jia-xin, et al. Effects of CO₂ and H₂O on solution loss reaction of coke[J]. The Chinese Journal of Process Engineering, 2016, 16(1): 138.)
[20] XU Run-sheng, DAI Bo-wen, WANG Wei, et al. Gasification reactivity and structure evolution of metallurgical coke under H₂O/CO₂ atmosphere[J]. Energy and Fuels, 2017, 32(2): 1188.
[21] CHANG Zhi-yu, WANG Ping, ZHANG Jian-liang, et al. Effect of CO₂ and H₂O on gasification dissolution and deep reaction of coke[J]. Metallurgy and Materials, 2018, 25(12):1402.
[22] GUO Wen-tao, XUE Qing-guo, LIU Ying-li, et al. Kinetic analysis of gasification reaction of coke with CO₂ or H₂O[J]. International Journal of Hydrogen Energy, 2015, 40(39): 6.
[23] Helleisen M, Nicolle R, Metz B, et al. Probing into the dead man of the blast furnace[J]. Metallurgical Research and Technology, 1987, 84(11): 747.
[24] 汪琦. 焦炭溶损对高炉冶炼的影响和焦炭高温性能讨论[J]. 鞍钢技术, 2013(5): 1.(WANG Qi. Effect of coke solution loss reaction on iron-making by blast furnace and discussion on high temperature properties of coke[J]. Angang Technology, 2013(5): 1.)
[25] CHENG A. Coke quality requirements for blast furnaces[J]. Fuel and Energy Abstracts, 2002, 43(4): 239.
[26] GUO Rui, WANG Qi. Relationship between coke properties and solution loss behavior and its influence on post-reaction strength of coke[J]. Revue De Métallurgie, 2012, 109(6):443.
[27] 王杰平, 谢全安, 孙章,等. 碳溶反应过程焦炭气孔结构变化规律[J]. 钢铁, 2015, 50(11): 8.(WANG Jie-ping, XIE Quan-an, SUN Zhang, et al. Pore structure development of coke during carbon solution loss reaction[J]. Iron and Steel, 2015, 50(11): 8.)
[28] Juho H, Hannu S, Mikko I, et al. Coke reactivity in simulated blast furnace shaft conditions[J]. Metallurgical and Materials Transactions B, 2016, 47(4): 2357.
[29] 李家新, 卢开成, 汪涧江, 等. H₂O-CO₂混合气体对焦炭劣化反应的影响[J]. 安徽工业大学学报(自然科学版), 2008, 25(3): 233.(LI Jia-xin, LU Kai-cheng, WANG Jian-jiang, et al. Influence of H₂O-CO₂ gas mixture on coke degradation[J]. Journal of Anhui University of Technology(Natural Science) 2008, 25(3): 233.)
[30] 赵晴晴, 薛庆国, 佘雪峰, 等. H₂O和CO₂对焦炭溶损反应动力学的研究[J]. 过程工程学报, 2012, 12(5): 789.(ZHAO Qing-qing, XUE Qing-guo, SHE Xue-feng, et al. Study on solution loss reaction kinetics of coke with H₂O and CO₂[J]. The Chinese Journal of Process Engineering, 2012, 12(5): 789.)
[31] WANG Wei, DAI Bo-wen, XU Run-sheng, et al. The Effect of H₂O on the reactivity and microstructure of metallurgical coke[J]. Steel Research Intenational, 2017, 88(8): 63.
[32] Kashiwaya Y, Ishii K. The kinds of reactions in coke gasification by H₂O[J]. Tetsu Hagane, 1993, 79(8): 1305.