生物质还原剂对转底炉直接还原工艺的影响
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摘要
选取竹炭、木炭、秸秆纤维3种生物质还原剂以及煤粉进行铁矿含碳球团的制备与还原焙烧试验,并从金属化率、抗压强度和体积收缩率三方面分析了生物质还原剂对转底炉直接还原工艺的影响。结果表明:生物质能够替代传统还原剂用于转底炉直接还原工艺。与传统还原剂相比,生物质还原剂在含碳球团金属化率方面的影响较小,但对含碳球团强度和体积收缩率等方面的影响较大。秸秆纤维含碳球团的强度相对较高,但竹炭和木炭含碳球团的强度较低;使用竹炭作还原剂的球团前期膨胀较其他还原剂更为严重,影响含碳球团的强度和热量传递,需与其他还原剂搭配使用。
Using charcoal,bamboo char,straw fiber and coal as the reductants,the study on the rotary hearth furnace( RHF)direct reduction process was conducted on three indexes,metallization rate,compressive strength and volumetric shrinkage.Test results showed that biomass reductants could replace traditional reductants used in the RHF direct reduction process.Compared with traditional reductants,biomass reductants had less affect on metallization rate,but different biomass reductants had large influence on strength and volumetric shrinkage. The compressive strength of pellet with straw fiber was relatively higher,and the compressive strength of pellets with charcoal or bamboo charcoal was lower. Using bamboo charcoal as reductant would lead to the expand of pellets in the beginning stage,which would affect the strength of pellets and the heattransfer between different material layers,thus it should be used together with other reductants.
Using charcoal,bamboo char,straw fiber and coal as the reductants,the study on the rotary hearth furnace( RHF)direct reduction process was conducted on three indexes,metallization rate,compressive strength and volumetric shrinkage.Test results showed that biomass reductants could replace traditional reductants used in the RHF direct reduction process.Compared with traditional reductants,biomass reductants had less affect on metallization rate,but different biomass reductants had large influence on strength and volumetric shrinkage. The compressive strength of pellet with straw fiber was relatively higher,and the compressive strength of pellets with charcoal or bamboo charcoal was lower. Using bamboo charcoal as reductant would lead to the expand of pellets in the beginning stage,which would affect the strength of pellets and the heattransfer between different material layers,thus it should be used together with other reductants.
引文
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[12]罗凯,陈汉平,王贤华,等.生物质较及其特性[J].可再生能源,2007,25(1):17-22.
[13]吴斌,龙世刚,曹枫.含碳球团强度及金属化率的影响因素[J].安徽工业大学学报,2007,24(2):127-129.
[14]张培栋,杨艳丽,李光全,等.中国农作物秸秆能源化潜力估算[J].可再生能源,2007,25(6):80-83.
[15]唐惠庆,范立强,马龙,等.生物质木炭用于鲕状高磷铁矿除磷[J].北京科技大学学报,2014,36(7):867-874.
[16]袁艳文,田宜水,赵立欣,等.生物炭应用研究进展[J].可再生能源,2012,30(9):45-49.
[17]Gupta R C,Gautam J P.The effect of additives and reductions on the strength of reduced iron ore pellet[J].ISIJ Int,2003,43(12):1913-1918.
[18]伦志刚,胡途,吕学伟.多层含碳球团转底炉内直接还原行为[J].钢铁,2013,48(1):15-19.
[19]胡兵,黄柱成,姜涛,等.不同还原度铁氧化物球团在微波场中的升温及还原行为[J].中南大学学报.自然科学版,2012,43(3):789-796.
[2]方觉.非高炉炼铁工艺与理论[M].2版.北京:冶金工业出版社,2010:5-12.
[3]郭玉华,齐渊洪,王海风,等.发展我国转底炉工艺需合理解决的关键技术[J].炼铁,2009,28(4):60-62.
[4]孙体昌,祁超英.还原剂对高磷鲕状赤铁矿直接还原过程铁还原的影响[J].北京科技大学学报,2011,33(8):905-910.
[5]胡正文,张建良,左海滨,等.炼铁用生物质焦的制备及其性能[J].北京科技大学学报,2012,34(9):998-1004.
[6]Ariyama T,Sato M.Optimization of ironmaking process for reducing CO2emissions in the integrated steel works[J].ISIJ Int,2006,46(12):1736-1744.
[7]孙永明,袁振宏,孙振钧.中国生物质能源与生物质利用现状与展望[J].可再生能源,2006(2):78-82.
[8]Norgate T,Haque N,Somerville M,et al.Biomass as a source of renewable carbon for iron and steelmaking[J].ISIJ Int,2012,52(8):1472-1481.
[9]梁爱云,惠世恩,徐通模,等.几种生物质的TG-DTD分析及其燃烧动力学特性研究[J].可再生能源,2008,26(4):56-61.
[10]蒋武锋,李运刚,赵利国,等.粘结剂对含碳球团还原的影响[J].钢铁研究学报,2000,12(4):1-4.
[11]杨学民,黄典冰,孔令坛,等.煤种对含煤球团还原速度的影响[J].钢铁研究学报,1997,9(2):1-6.
[12]罗凯,陈汉平,王贤华,等.生物质较及其特性[J].可再生能源,2007,25(1):17-22.
[13]吴斌,龙世刚,曹枫.含碳球团强度及金属化率的影响因素[J].安徽工业大学学报,2007,24(2):127-129.
[14]张培栋,杨艳丽,李光全,等.中国农作物秸秆能源化潜力估算[J].可再生能源,2007,25(6):80-83.
[15]唐惠庆,范立强,马龙,等.生物质木炭用于鲕状高磷铁矿除磷[J].北京科技大学学报,2014,36(7):867-874.
[16]袁艳文,田宜水,赵立欣,等.生物炭应用研究进展[J].可再生能源,2012,30(9):45-49.
[17]Gupta R C,Gautam J P.The effect of additives and reductions on the strength of reduced iron ore pellet[J].ISIJ Int,2003,43(12):1913-1918.
[18]伦志刚,胡途,吕学伟.多层含碳球团转底炉内直接还原行为[J].钢铁,2013,48(1):15-19.
[19]胡兵,黄柱成,姜涛,等.不同还原度铁氧化物球团在微波场中的升温及还原行为[J].中南大学学报.自然科学版,2012,43(3):789-796.