基于DEM法氢气直接还原竖炉内物料运动行为研究
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摘要
H2作为还原剂在竖炉内生产直接还原铁,可降低炼铁过程中的碳耗并减少CO2排放。物料运动行为直接影响到氢气直接还原竖炉内反应及生产效率。本文通过离散单元法建立竖炉内炉料颗粒运动三维模型,针对不同高度条件下炉内物料运动行为进行模拟仿真。研究表明氢气竖炉由于高度较低,下层物料运动速率分布不均匀性更显著,在竖炉下部,物料下降速率由中心向边缘处逐渐降低,为氢气直接还原竖炉炉型及设备设计提供理论指导。
Utilization of hydrogen as the reductant to produce sponge iron in the shaft furnace is considered as an effective way to reduce the dependency on coal and cut down the carbon dioxide emission in ironmaking.Movement behavior plays a very important role in the uniform drawdown pattern,which directly affects the uniform gas distribution and further the smooth operation in the hydrogen direct reduction shaft furnace. A three dimensional model is established on basis of the discrete element method to simulate the particle descending velocity distribution in furnace with the different height of shaft furnac. Results show that the descending velocity decreases along the radial direction in bottom of furnace,and the inhomogeneity of velocity is more remarkable in hydrogen furnace. This study can provide scientific guide for rational utilization of hydrogen energy in iron making.
Utilization of hydrogen as the reductant to produce sponge iron in the shaft furnace is considered as an effective way to reduce the dependency on coal and cut down the carbon dioxide emission in ironmaking.Movement behavior plays a very important role in the uniform drawdown pattern,which directly affects the uniform gas distribution and further the smooth operation in the hydrogen direct reduction shaft furnace. A three dimensional model is established on basis of the discrete element method to simulate the particle descending velocity distribution in furnace with the different height of shaft furnac. Results show that the descending velocity decreases along the radial direction in bottom of furnace,and the inhomogeneity of velocity is more remarkable in hydrogen furnace. This study can provide scientific guide for rational utilization of hydrogen energy in iron making.
引文
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[15]Zhou H,Luo Z G,Zhang T,et al.Analyses of Solid Flow in COREX Shaft Furnace with AGD by Discrete Element Method[J].Ironmaking and Steelmaking,2015,42(10):774-784.
[2]张春霞,上官方钦,胡长庆,等.钢铁流程结构及对CO2排放的影响[J].钢铁,2010,45(05):1-6.
[3]Sakamoto Y,Tonooka Y,Yanagisawa Y.Estimation of CO2 Emission for Each Process in the Japanese Steel Industry:a Process Analysis[J].Energy Conveision and Management,1999,40(11):1129-1140.
[4]方觉.非高炉炼铁工艺与理论[M].北京:冶金工业出版社,2002.
[5]Costa A R D,Wagner D,Patisson F.Modelling a New,Low CO2,Emissions,Hydrogen Steelmaking Process[J].Journal of Cleaner Production,2013(46):27-35.
[6]Warner N A.Towards Zero CO2 Continuous Steelmaking Directly from Ore[J].Metallurgical and Materials Transactions B,2014,45(06):2080-2096.
[7]徐辉,邹宗树,周渝生.竖炉生产直接还原铁过程的数值模拟[J].材料与冶金学报,2009,8(01):7-11.
[8]董雪锋,肖兴国,邹宗树,等.COREX预还原反应过程的数学物理仿真[J].包头钢铁学院学报,1999,18(02):117-120.
[9]白明华,葛俊礼,龙鹄,等.浅议我国直接还原铁技术今后的发展[J].重型机械,2013(05):1-5.
[10]Minghua Bai,Hu Long,Ren Subo.Reduction Behavior and Kinetics of Iron Ore Pellets under H2-N2Atmosphere[J].ISIJ International,2018,58(06).
[11]Parisi D R,Laborde M A.Modeling of Counter Current Moving Bed Gas-solid Reactor Used in Direct Reduction of Iron Ore[J].Chemical Engineering Journal,2004,104(01):35-43.
[12]白明华,葛俊礼,王健,等.浅析还原气需求量及其与炉内流场关系[J].重型机械,2014(02):31-34.
[13]Kou M Y,Wu S L,Du K P,et al.Distribution of Particle Descending Velocity in the COREX Shaft Furnace with DEM Simulation[J].ISIJ International,2013,53(12):2080-2089.
[14]Hou Q F,Samman M,Li J,et al.Modeling the Gas-solid Flow in the Reduction Shaft of COREX[J].ISIJ International,2014,54(08):1772-1780.
[15]Zhou H,Luo Z G,Zhang T,et al.Analyses of Solid Flow in COREX Shaft Furnace with AGD by Discrete Element Method[J].Ironmaking and Steelmaking,2015,42(10):774-784.