|
|
Effect of adding semi-coke in blast furnace on droplet characteristics of charge column and coke solution loss |
TIAN Zengchao1, ZHAN Wenlong1,2, HAN Peng3, WANG Chuan2, HE Zhijun1, ZHANG Junhong1, PANG Qinghai1 |
1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China; 2. Metallurgy Department, Swerim AB, Lulea 97125, Norrbotten, Sweden; 3. The second Ironmaking Plant, Lingyuan Iron and Steel Group Co., Ltd., Lingyuan 122500, Liaoning, China |
|
|
Abstract With the promotion of the "carbon peaking and carbon neutrality" policy, steel enterprises are facing the pressure of ultra-low carbon emissions, and reducing coke consumption is one of the essential measures to achieve low carbon smelting in blast furnaces. Semi-coke has similar physical and chemical properties to coke and can meet the basic needs of blast furnace ironmaking, which can be used as a substitute for coke. The droplet characteristics and solution loss degree of coke after adding semi-coke were studied under simulated blast furnace conditions. Then the feasibility of replacing coke with semi-coke in blast furnace ironmaking was discussed. The results show that the droplet characteristic is better in mixed coke than in unmixed coke. When the proportion of semi-coke added decreases from 30% to 10%, the droplet characteristic value S decreases from 774 kPa·℃ to 597 kPa·℃, the max differential pressure ΔPMAX decreases from 13.66 kPa to 11.79 kPa, and the softening zone becomes more comprehensive and the position descends. The zone of melting widens and decreases, while the range and position of the soft melt zone are gradually close to the situation of mixed coke loading, and the permeability of the charge column is good. After adding semi-coke, the slag phase is more stable and the reduction degree of Fe is higher. Adding semi-coke can reduce the porosity of coke to a certain extent, reduce the coke solution loss degree, provide good protection for coke, and improve the permeability of the charge column. It proves that it is feasible to replace metallurgical coke with semi-coke, providing theoretical basis and technical guidance for using semi-coke in blast furnaces.
|
Received: 07 July 2023
|
|
|
|
[1] |
王海风,平晓东,周继程,等. 中国钢铁工业绿色发展回顾及展望[J]. 钢铁,2023,58(2): 8.
|
[2] |
张琦,沈佳林,籍杨梅. 典型钢铁制造流程碳排放及碳中和实施路径[J]. 钢铁,2023,58(2): 173.
|
[3] |
郭艳玲,胡俊鸽,周文涛,等. 焦炭质量对高炉炼铁的影响[J]. 上海金属,2014,36(3):51.
|
[4] |
王维兴. 使用兰炭促进节能减排降低炼铁成本[C]//全国炼铁生产技术会议暨炼铁学术年会.郑州: 中国金属协会,2012: 298.
|
[5] |
王筱留. 钢铁冶金学 炼铁部分[M]. 2版. 北京:冶金工业出版社,2004.
|
[6] |
HU Y,NAITO S,KOBAYASHI N,et al. CO2, NOx and SO2 emissions from the combustion of coal with high oxygen concentration gases[J]. Fuel,2000,79(15):1925.
|
[7] |
曾宇,姜喆,张建良,等. 鞍钢高炉喷吹燃料的综合特性分析[J]. 中国冶金,2022,32(5): 80.
|
[8] |
李杰,李小静,李帮平,等. 兰炭用作高炉喷吹燃料的试验分析[J]. 中国冶金,2019,29(12):14.
|
[9] |
曾宇,姜喆,张建良,等. 大喷煤条件下鞍钢高炉喷吹煤粉的炉内利用率[J]. 中国冶金,2022,32(3):61.
|
[10] |
YANG S P,CAI W M,ZHENG H A,et al. Performance analysis of semi-coke for blast furnace injection[J]. The Chinese Journal of Process Engineering,2014,14(5):896.
|
[11] |
宁晓钧,党晗,张建良,等. 低阶煤热解与兰炭生产工艺研究进展[J]. 钢铁,2021,56(1): 1.
|
[12] |
STRAKHOV V M,SUROVTSEVA I V,DOLINSKII V A,et al. Lignite semicoke as a fuel in iron-ore sintering[J]. Coke and Chemistry,2007,50(8):219.
|
[13] |
张兵,吴铿,杜瑞岭,等. 半焦与烧结矿的混合还原反应过程动力学[J]. 钢铁研究学报,2017, 29(12):960.
|
[14] |
MOUSA E A, BABICH A, SENK D. Effect of nut coke-sinter mixture on the blast furnace performance[J]. ISIJ International, 2011, 51(3):350.
|
[15] |
HE J Y,ZOU C,ZHAO J X,et al. Comparison of semi-coke with traditional pulverized coal injection and iron ore sintering fuels based on chemical structure and combustion behavior[J]. Journal of Iron and Steel Research International,2022,29(5): 725.
|
[16] |
邹冲,马成,赵俊学,等. 中低温热解兰炭作为高炉喷吹燃料的现状分析及建议[J]. 洁净煤技术,2017,23(1):57.
|
[17] |
张建良, 林祥海, 孔德文, 等. 生物质焦与煤混合燃烧特性及动力学分析[J].北京科技大学学报,2012,34 (3):348.
|
[18] |
张典波,徐辉,朱锦明.宝钢2号高炉喷吹兰炭生产试验[J].炼铁,2015,34(1):40.
|
[19] |
巩黎伟.太钢高炉喷吹兰炭煤生产实践[J]. 炼铁,2018,37(5):16.
|
[20] |
张立国,任伟,刘德军,等. 半焦作为高炉喷吹用煤研究[J]. 鞍钢技术,2015(1): 13.
|
[21] |
付利俊,李晓炅,孙睿.半焦在包钢高炉喷吹工艺中的应用研究[J].燃料与化工,2020,51(3):1.
|
[22] |
白晓光,郑占斌. 包钢高炉喷吹低温半焦试验研究[J]. 包钢科技,2017,43(1): 31.
|
[23] |
刘颖超,张军红,刘燕军,等. 兰炭替代部分焦炭对焦炭层透液性的影响[J]. 有色金属科学与工程,2021,12(3): 29.
|
[24] |
孟庆波. 兰炭可替代小块焦用于高炉炼铁[N]. 中国冶金报, 2011-08-25.
|
[25] |
WANG G,XUE Q G,WANG J S. Effect of mixing charge of highly reactive semicoke nut on the reaction of high Al2O3 ferrous burden in blast furnace[J]. Ironmaking Steelmaking, 2019,46(5):477.
|
[26] |
湛文龙,邸航,孙崇,等. 高炉含铁炉料软熔滴落特性的测试装置及方法:中国,CN 201710942258.7[P]. 2017-10-11.
|
[27] |
邸航,何志军,阎丽娟,等. 基于大型炼铁原料熔滴检测设备的综合炉料性能[J]. 钢铁,2018,53(10):90.
|
|
|
|