世界钢铁
世界鋼鐵
세계강철
WORLD IRON & STEEL
2010年
3期
7-17
,共11页
人工神经网络%还原粉化指数%造球工艺%焙烧%生球%球团质量
人工神經網絡%還原粉化指數%造毬工藝%焙燒%生毬%毬糰質量
인공신경망락%환원분화지수%조구공예%배소%생구%구단질량
artificial neural network%reduction degradation index%pelletization%induration%green pellet%pellet quality
印度JSW钢铁公司是一家年产钢700 万t的联合钢铁企业,其炼铁单元由2座COREX和3座高炉组成.COREX和高炉用球团由一个年产420 万t的带式焙烧机球团厂供给.作为一项重要的冶金性能指标,球团的还原粉化指数(RDI)要求满足COREX和高炉冶炼的要求.通过建立神经元网络模型和敏感度分析,研究了给料率、料层高度、焙烧温度、干透点温度、COREX煤气单耗、膨润土的添加量、生球水分、生球碳含量、以及成品球的MgO、Al2O3含量和碱度等12个因素对球团RDI指标的影响,并对焙烧机生产球团的RDI(-6.3 mm) 和 RDI (-0.5 mm)进行了预测.结果表明,球团中MgO、CaO/SiO2,生球碳含量和Al2O3含量对球团RDI指标影响较大.预测结果与实际的数据误差低于4%.研究得出:①生球的MgO、氧化铝和碳含量以及二元碱度对球团RDI有重要影响.②随着球团MgO含量和球团二元碱度的升高,球团RDI(-6.3 mm)和RDI(-0.5 mm)得到改善.③随着生球中氧化铝含量的增加,球团RDI升高,因此应尽量使用低氧化铝含量的铁矿粉来降低球团中的氧化铝.随着生球中氧化铝和碳含量的增加,球团RDI(-6.3 mm)和RDI(-0.5 mm)有所降低.④提高球团二元碱度和MgO含量的同时,降低生球碳含量可以改善球团的RDI.因此需要对它们的配比进行优化.⑤二元碱度0.50～0.55,MgO质量分数0.35%～0.45%, 生球碳质量分数1.15%～1.20%,焙烧球氧化铝质量分数低于2.5%,FeO质量分数低于0.60%时,可望得到较低的RDI.⑥相对于球团中的碳和CaO含量,最优的焙烧温度可以改善球团的RDI(-6.3 mm)和RDI(-0.5 mm).⑦高给料率和较高的料层高度会使球团的RDI(-6.3 mm)和 RDI(-0.5 mm)升高.
印度JSW鋼鐵公司是一傢年產鋼700 萬t的聯閤鋼鐵企業,其煉鐵單元由2座COREX和3座高爐組成.COREX和高爐用毬糰由一箇年產420 萬t的帶式焙燒機毬糰廠供給.作為一項重要的冶金性能指標,毬糰的還原粉化指數(RDI)要求滿足COREX和高爐冶煉的要求.通過建立神經元網絡模型和敏感度分析,研究瞭給料率、料層高度、焙燒溫度、榦透點溫度、COREX煤氣單耗、膨潤土的添加量、生毬水分、生毬碳含量、以及成品毬的MgO、Al2O3含量和堿度等12箇因素對毬糰RDI指標的影響,併對焙燒機生產毬糰的RDI(-6.3 mm) 和 RDI (-0.5 mm)進行瞭預測.結果錶明,毬糰中MgO、CaO/SiO2,生毬碳含量和Al2O3含量對毬糰RDI指標影響較大.預測結果與實際的數據誤差低于4%.研究得齣:①生毬的MgO、氧化鋁和碳含量以及二元堿度對毬糰RDI有重要影響.②隨著毬糰MgO含量和毬糰二元堿度的升高,毬糰RDI(-6.3 mm)和RDI(-0.5 mm)得到改善.③隨著生毬中氧化鋁含量的增加,毬糰RDI升高,因此應儘量使用低氧化鋁含量的鐵礦粉來降低毬糰中的氧化鋁.隨著生毬中氧化鋁和碳含量的增加,毬糰RDI(-6.3 mm)和RDI(-0.5 mm)有所降低.④提高毬糰二元堿度和MgO含量的同時,降低生毬碳含量可以改善毬糰的RDI.因此需要對它們的配比進行優化.⑤二元堿度0.50～0.55,MgO質量分數0.35%～0.45%, 生毬碳質量分數1.15%～1.20%,焙燒毬氧化鋁質量分數低于2.5%,FeO質量分數低于0.60%時,可望得到較低的RDI.⑥相對于毬糰中的碳和CaO含量,最優的焙燒溫度可以改善毬糰的RDI(-6.3 mm)和RDI(-0.5 mm).⑦高給料率和較高的料層高度會使毬糰的RDI(-6.3 mm)和 RDI(-0.5 mm)升高.
인도JSW강철공사시일가년산강700 만t적연합강철기업,기련철단원유2좌COREX화3좌고로조성.COREX화고로용구단유일개년산420 만t적대식배소궤구단엄공급.작위일항중요적야금성능지표,구단적환원분화지수(RDI)요구만족COREX화고로야련적요구.통과건립신경원망락모형화민감도분석,연구료급료솔、료층고도、배소온도、간투점온도、COREX매기단모、팽윤토적첨가량、생구수분、생구탄함량、이급성품구적MgO、Al2O3함량화감도등12개인소대구단RDI지표적영향,병대배소궤생산구단적RDI(-6.3 mm) 화 RDI (-0.5 mm)진행료예측.결과표명,구단중MgO、CaO/SiO2,생구탄함량화Al2O3함량대구단RDI지표영향교대.예측결과여실제적수거오차저우4%.연구득출:①생구적MgO、양화려화탄함량이급이원감도대구단RDI유중요영향.②수착구단MgO함량화구단이원감도적승고,구단RDI(-6.3 mm)화RDI(-0.5 mm)득도개선.③수착생구중양화려함량적증가,구단RDI승고,인차응진량사용저양화려함량적철광분래강저구단중적양화려.수착생구중양화려화탄함량적증가,구단RDI(-6.3 mm)화RDI(-0.5 mm)유소강저.④제고구단이원감도화MgO함량적동시,강저생구탄함량가이개선구단적RDI.인차수요대타문적배비진행우화.⑤이원감도0.50～0.55,MgO질량분수0.35%～0.45%, 생구탄질량분수1.15%～1.20%,배소구양화려질량분수저우2.5%,FeO질량분수저우0.60%시,가망득도교저적RDI.⑥상대우구단중적탄화CaO함량,최우적배소온도가이개선구단적RDI(-6.3 mm)화RDI(-0.5 mm).⑦고급료솔화교고적료층고도회사구단적RDI(-6.3 mm)화 RDI(-0.5 mm)승고.
JSW Steel Limited is a 7.0 Mt/a integrated steel plant having two Corex and three Blast Furnace (BF) iron making units. The major iron bearing feed to Corex units is pellet, whereas, in the BF, the iron bearing charge consists of pellet/sinter/lump ore in the ratio of 30∶ 50∶ 20 and its requirement is met by a 4.2 Mt/a pellet plant and two sinter plants.Reduction degradation index (RDI) of the pellet is an important metallurgical property of the pellet and is supposed to be good enough within desired specifications to fulfill the Corex and blast furnace requirement. To get desired RDI of the pellets, pellet plant operating conditions should be under more control. To study the effect of input variables on RDI property, an artificial neural network model has been developed to predict the RDI (-6.3 mm) and RDI (-0.5 mm) of the pellet in the straight grate induration machine from 12 input variables, namely feed rate, bed height, firing temperature, burnthrough temperature, specific corex gas consumption, bentonite, green ball moisture, green pellet carbon content and MgO, FeO, Al2O3 and basicity of fired pellets. The RDI of the pellets was more sensitive to variation in MgO, CaO/SiO2, green pellet carbon content and Al2O3. The predicted results were in good agreement with the actual data with less than 4% error.
