回转窑预还原-氧煤燃烧熔分炼铁技术分析
|
摘要
针对高炉炼铁存在工艺流程长、焦炭依赖度高、环境污染大等问题,提出了一种回转窑预还原-氧煤燃烧熔分炼铁新工艺。该工艺具有原料适应性广,不需要消耗焦炭,污染物排放少,适合冶炼特殊铁矿资源等特点。通过建立数学模型,对该工艺进行了数值模拟。计算结果表明,回转窑预还原炉料的金属化率、熔分炉煤气的氧化度和鼓风氧含量对冶炼工艺煤耗和氧耗影响较大,煤粉和氧气消耗随着预还原炉料金属化率的升高,熔分炉煤气氧化度的增大和鼓风氧含量的升高而降低。该工艺对冶炼特殊铁矿资源具有显著优势,可以弥补高炉冶炼的不足,对降低燃料消耗和减少CO_2排放具有重大意义。
The traditional blast furnace ironmaking process has many problems such as long process flow,high dependence on coke and large environmental pollution.In order to solve these problems,the new ironmaking process of rotary kiln pre-reduction and smelting by coal and oxygen was developed.This new process has advantages of wide raw material adaptability,no coke consumption,less pollutant emissions and suitable for special iron ore resources.The mathematical model of the new process was established.Numerical simulation results show that the metallization rate of pre-reduction iron,smelting furnace gas oxidation degree and blast air oxygen content have great influence on coal and oxygen consumption.The coal and oxygen consumption reduces with the increase of pre-reduction iron metallization rate,the rise of oxygen degree of coal gas or the decrease of oxygen content of blast air.This process has a significant advantage in smelting special iron ore resources,which can make up the shortage of blast furnace ironmaking.It is also of great significance to reduce fuel consumption and CO_2 emissions.
The traditional blast furnace ironmaking process has many problems such as long process flow,high dependence on coke and large environmental pollution.In order to solve these problems,the new ironmaking process of rotary kiln pre-reduction and smelting by coal and oxygen was developed.This new process has advantages of wide raw material adaptability,no coke consumption,less pollutant emissions and suitable for special iron ore resources.The mathematical model of the new process was established.Numerical simulation results show that the metallization rate of pre-reduction iron,smelting furnace gas oxidation degree and blast air oxygen content have great influence on coal and oxygen consumption.The coal and oxygen consumption reduces with the increase of pre-reduction iron metallization rate,the rise of oxygen degree of coal gas or the decrease of oxygen content of blast air.This process has a significant advantage in smelting special iron ore resources,which can make up the shortage of blast furnace ironmaking.It is also of great significance to reduce fuel consumption and CO_2 emissions.
引文
[1]严珺洁.超低二氧化碳排放炼钢项目的进展与未来[J].中国冶金,2017,27(2):6.(Yan J J.Process and future of ultra low CO2steel making program[J].China Metallurgy,2017,27(2):6.)
[2]储满生,赵庆杰.中国发展非高炉炼铁的现状及展望[J].中国冶金,2008,18(9):1.(Chu M S,Zhao Q J.Present status and development perspective of direct reduction and smelting reduction in China[J].China Metallurgy,2008,18(9):1.)
[3]周渝生,钱晖,张友平,等.现有主要炼铁工艺的优缺点和研发方向[J].钢铁,2009,44(2):1.(Zhou Y S,Qian H,Zhang Y P,et al.Advantages and disadvantages and its research direction of present ironmaking processes[J].Iron and Steel,2009,44(2):1.)
[4]周春林,刘春明,董亚锋,等.国外炼铁状况及中国炼铁发展方向[J].钢铁,2008,43(12):1.(Zhou C L,Liu C M,Dong Y F,et al.BF ironmaking in the world and development direction in China[J].Iron and Steel,2008,43(12):1.)
[5]贾国利,张丙怀,阳海彬,等.COREX 3000熔融还原炼铁工艺能量利用特征[J].中国冶金,2007,17(3):43.(Jia G L,Zhang B H,Yang H B,et al.Characters of energy consumption of COREX 3000smelting reduction process[J].China Metallurgy,2007,17(3):43.)
[6]Bohm C,Siuka D,Schenk J,et al.Development and current status of the Corex and Finex process[C]//Proceedings of2007China Iron and Steel Annual Meeting.Beijing:The Chinese Society for Metals,2007:142.
[7]张寿荣,张绍贤.韩国浦项钢铁公司Finex工艺[J].钢铁,2009,30(3):1.(Zhang S R,Zhang S X.FINEX process at POSCO steel corporation in Korea[J].Iron and Steel,2009,30(3):1.)
[8]Pokhvisnev Y,Romenets V A,Valavin V,et al.Romelt process-promising technology for ironmaking[J].METAL,2002(5):14.
[9]Romenets V A,Usachev A B,Balasanov A V,et al.The role of coal in the romelt process for the liquid-phase reduction of iron[J].Metallurgist,2001,45(3):101.
[10]任鸿九.有色金属熔池熔炼[M].北京:冶金工业出版社,2001.(Ren H J.Bath Smelting of Nonferrous Metal[M].Beijing:Metallurgical Industry Press,2001.)
[11]何奕波,唐彪,李强,等.两步三段式厚渣层铁浴熔融还原炼铁工艺[J].钢铁研究学报,2015,27(5):13.(He Y B,Tang B,Li Q,et al.Two-step three-segment iron bath smelting reduction process with thick slag layer[J].Journal of Iron and Steel Research,2015,27(5):13.)
[12]张建良,刘征建,杨天钧.非高炉炼铁[M].北京:冶金工业出版社,2015.(Zhang J L,Liu Z J,Yang T J.Non-blast Furnace Ironmaking[M].Beijing:Metallurgical Industry Press,2015.)
[2]储满生,赵庆杰.中国发展非高炉炼铁的现状及展望[J].中国冶金,2008,18(9):1.(Chu M S,Zhao Q J.Present status and development perspective of direct reduction and smelting reduction in China[J].China Metallurgy,2008,18(9):1.)
[3]周渝生,钱晖,张友平,等.现有主要炼铁工艺的优缺点和研发方向[J].钢铁,2009,44(2):1.(Zhou Y S,Qian H,Zhang Y P,et al.Advantages and disadvantages and its research direction of present ironmaking processes[J].Iron and Steel,2009,44(2):1.)
[4]周春林,刘春明,董亚锋,等.国外炼铁状况及中国炼铁发展方向[J].钢铁,2008,43(12):1.(Zhou C L,Liu C M,Dong Y F,et al.BF ironmaking in the world and development direction in China[J].Iron and Steel,2008,43(12):1.)
[5]贾国利,张丙怀,阳海彬,等.COREX 3000熔融还原炼铁工艺能量利用特征[J].中国冶金,2007,17(3):43.(Jia G L,Zhang B H,Yang H B,et al.Characters of energy consumption of COREX 3000smelting reduction process[J].China Metallurgy,2007,17(3):43.)
[6]Bohm C,Siuka D,Schenk J,et al.Development and current status of the Corex and Finex process[C]//Proceedings of2007China Iron and Steel Annual Meeting.Beijing:The Chinese Society for Metals,2007:142.
[7]张寿荣,张绍贤.韩国浦项钢铁公司Finex工艺[J].钢铁,2009,30(3):1.(Zhang S R,Zhang S X.FINEX process at POSCO steel corporation in Korea[J].Iron and Steel,2009,30(3):1.)
[8]Pokhvisnev Y,Romenets V A,Valavin V,et al.Romelt process-promising technology for ironmaking[J].METAL,2002(5):14.
[9]Romenets V A,Usachev A B,Balasanov A V,et al.The role of coal in the romelt process for the liquid-phase reduction of iron[J].Metallurgist,2001,45(3):101.
[10]任鸿九.有色金属熔池熔炼[M].北京:冶金工业出版社,2001.(Ren H J.Bath Smelting of Nonferrous Metal[M].Beijing:Metallurgical Industry Press,2001.)
[11]何奕波,唐彪,李强,等.两步三段式厚渣层铁浴熔融还原炼铁工艺[J].钢铁研究学报,2015,27(5):13.(He Y B,Tang B,Li Q,et al.Two-step three-segment iron bath smelting reduction process with thick slag layer[J].Journal of Iron and Steel Research,2015,27(5):13.)
[12]张建良,刘征建,杨天钧.非高炉炼铁[M].北京:冶金工业出版社,2015.(Zhang J L,Liu Z J,Yang T J.Non-blast Furnace Ironmaking[M].Beijing:Metallurgical Industry Press,2015.)