熔融还原高温煤气余热改质的数值分析
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摘要
针对熔融还原反应器产生的高温煤气不能直接进入预还原反应器,提出在两步法熔融还原工艺中耦合煤气改质反应器,建立能量平衡和动力学模型,对待改质气的温度和成分与改质后还原势及富氢程度的关系进行计算,定量给出改质炉设计的2个关键参数碳基填充床高度和碳颗粒粒度对改质过程的影响。研究结果表明:在满足预还原要求温度条件下,COREX终还原炉煤气经改质氧化度可由0.100降至0.065,HiSMELT熔融还原炉炉顶煤气氧化度可由0.625降至0.223。煤气改质使熔融还原产生的高温煤气自身废热物理能转变为还原势化学能,使煤气的能量利用更加高效、合理。
To solve the problem that high temperature gas of final reduction reactor of smelt reduction process cannot be directly introduced into the pre-reduction reactor,the new gas reforming reactor was presented in combination with the two-step smelting reduction process.Based on the energy balance and thermodynamic model,the relationship between the temperature,and composition and reduce potential energy,and rich-hydrogen content was calculated.After that,it was quantities discussed effect of height of packed bed and size of carbon particle,which were the two key parameters for the design of reforming reactor.The results show that through the reforming the oxidation degree of the COREX gas decreases to 0.065,from original 0.100,the oxidation degree of the HiSMELT gas decreases to 0.223,from original 0.625.The gas reforming made the physical energy of high temperature gas exhaust heat convert into chemical potential energy,and energy utilities is more efficient and reasonable.
To solve the problem that high temperature gas of final reduction reactor of smelt reduction process cannot be directly introduced into the pre-reduction reactor,the new gas reforming reactor was presented in combination with the two-step smelting reduction process.Based on the energy balance and thermodynamic model,the relationship between the temperature,and composition and reduce potential energy,and rich-hydrogen content was calculated.After that,it was quantities discussed effect of height of packed bed and size of carbon particle,which were the two key parameters for the design of reforming reactor.The results show that through the reforming the oxidation degree of the COREX gas decreases to 0.065,from original 0.100,the oxidation degree of the HiSMELT gas decreases to 0.223,from original 0.625.The gas reforming made the physical energy of high temperature gas exhaust heat convert into chemical potential energy,and energy utilities is more efficient and reasonable.
引文
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[15]张铁,闫家斌.数值分析[M].北京:冶金工业出版社,2001:239-242.ZHANG Tie,YAN Jiabin.Numerical analysis[M].Beijing:Metallurgical Industry Press,2001:239-242.
[2]Kurunow L F.The Direct production of iron and alternatives tothe blast furnace in iron metallurgy for the 21st century[J].Metallurgist,2010,54(9):335-342.
[3]Kitagawa T.Present status of the development of smeltingreduction technologies[J].Tetsu to Hagane,2002,88(8):430-443.
[4]邹宗树,王臣.熔融还原炼铁工艺的富氢煤气预还原[J].钢铁,2007,42(8):17-20.ZOU Zongshu,WANG Chen.On hydrogen enriching gas reformfor pre-reduction in smelting reduction iron making process[J].Iron&Steel,2007,42(8):17-20.
[5]王臣,马丽,王楠,等.熔融还原工艺中煤气富氢改质初步研究[C]//2006中国非高炉炼铁会议论文集.沈阳:东北大学出版社,2006:247251.WANG Chen,MA Li,WANG Nan,et al.Preliminary study onhydrogen-enriched reforming gas in smelting reductionprocess[C]//Conference Proceedings of China Non-blast FurnaceIron-making 2006.Shenyang:Northeastern University Press,2006:247-251.
[6]杨天钧,黄典冰,孔令坛.熔融还原[M].北京:冶金工业出版社,1998:18.YANG Tianjun,HANG Dianbing,KONG Lingtan.Smeltingreduction[M].Beijing:Metallurgical Industry Press,1998:1-8.
[7]高斌,杨天钧,姚斌,等.煤气改质过程能量利用分析[J].北京科技大学学报,2000,22(2):117-120.GAO Bin,YANG Tianjun,YAO Bin,et al.Analyses of gasreforming process for energy utilization in smelting reduction[J].Journal of University of Science and Technology Beijing,2000,22(2):117-120.
[8]Sujoy K,Ghosh A.Kinetics of gaseous reduction of iron orefines[J].ISIJ Int,1993,33(11):1168-1173.
[9]Ono-Nakazato H,Yonezawa T,Usui T.Effect of water-gas shiftreaction on reduction of iron oxide powder packed bed withH2-CO mixtures[J].ISIJ Int,2003,43(10):1502-1511.
[10]Kikuchi R,Yamamoto T,Sato H,et al.Comparison of wasteco-incineration with waste gasification smelting[C]//Proceedingsof the 10th International Energy Forum,International EnergyFoundation,Lisbon,2004:62-74.
[11]Weeda M,Tromp P J J,Linden L.High temperature gasificationof coal under severely production inhibited condition:Thepotential of catalysis[J].Fuel,1990,69(7):842-846.
[12]Ergun S.Fluid flow through packed columns[J].ChemicalEngineering Progress,1952,48(2):89-94.
[13]Yagi J,Szekely J.The effect of gas and solids maldistribution onthe performance of moving-bed reactors:The reduction of ironoxide pellets with hydrogen[J].AIChE Journal,1979,25(5):800-810.
[14]鞭岩,森山昭,蔡志鹏,等.冶金反应工程学[M].北京:科学出版社,1981:247267.BIAN Yan,SEN Shanzhao,CAI Zhipeng,et al.Metallurgicalreaction engineering studies[M].Beijing:Science Press,1981:247-267.
[15]张铁,闫家斌.数值分析[M].北京:冶金工业出版社,2001:239-242.ZHANG Tie,YAN Jiabin.Numerical analysis[M].Beijing:Metallurgical Industry Press,2001:239-242.