基于大型铁矿石熔滴检测设备的综合炉料性能
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摘要
铁矿石的高温软熔滴落性能影响高炉内软熔带的形状及位置,进而影响高炉操作的稳定顺行。国内外传统的铁矿石熔滴检测设备存在坩埚尺寸小,试样量少等问题,导致无法客观地模拟高炉实际生产中复杂的炉料结构,同时试验结果波动较大,重现性差。使用大型铁矿石熔滴检测设备,测定了不同炉料结构下含铁炉料的高温软熔滴落特性,同时对比了传统小型熔滴检测设备,结果表明,随着块矿使用比例的增加,大型铁矿石熔滴检测设备测定的炉料的滴落温度td值随之减低,熔滴特征值S值呈相反规律;试验过程中料层出现的压差ΔP值达到峰值后呈现一定幅度的动态变化,初渣试样主要成分为黄长石类矿物及硅酸二钙(C2S)等,且料层的收缩率ΔH值明显增大,符合炉内铁矿石还原过程的生产实际。
The shape and location of the cohesive zone in a BF were significantly affected by the softening dropping properties of the iron-bearing burden,which could further influence the BF stable smooth operation. The traditional iron ore droplet testing equipment at home and abroad couldn't simulate the complicated BF burden in the actual production objectively due to the small crucible size used and few samples taken in the experiment,and the experiment results were fluctuant and poor reproducibility. The metallurgical properties of different BF burdens were detected based on a large scale iron ore droplet testing equipment with independent intellectual property rights. By comparing the large equipment testing results with the traditional testing results,it was found that thetd value tested by the large equipment was decreased with the lump ore proportion increasing,while the Svalue showed the opposite tendency. The main components of the primary slag were melilite and dicalcium silicate(C2 S). Moreover,theΔPvalue showed dynamic changes when it reached the peak value and theΔH value increased distinctly,which were much closer to the BF practical production of the iron ore reduction process.
The shape and location of the cohesive zone in a BF were significantly affected by the softening dropping properties of the iron-bearing burden,which could further influence the BF stable smooth operation. The traditional iron ore droplet testing equipment at home and abroad couldn't simulate the complicated BF burden in the actual production objectively due to the small crucible size used and few samples taken in the experiment,and the experiment results were fluctuant and poor reproducibility. The metallurgical properties of different BF burdens were detected based on a large scale iron ore droplet testing equipment with independent intellectual property rights. By comparing the large equipment testing results with the traditional testing results,it was found that thetd value tested by the large equipment was decreased with the lump ore proportion increasing,while the Svalue showed the opposite tendency. The main components of the primary slag were melilite and dicalcium silicate(C2 S). Moreover,theΔPvalue showed dynamic changes when it reached the peak value and theΔH value increased distinctly,which were much closer to the BF practical production of the iron ore reduction process.
引文
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[17]吴胜利,王来信,王玉珏,等.含铁炉料间高温交互作用对初渣生成行为的影响[J].工程科学学报,2016,38(11):1546.(WU Sheng-li,WANG Lai-xin,WANG Yu-jue,et al. Influence of high temperature interaction between iron ores on the formation behavior of primary slags[J]. Chinese Journal of Engineering,2016,38(11):1546.)
[2]孙敏敏,宁晓钧,张建良,等.炼铁系统节能减排技术的现状和发展[J].中国冶金,2018,28(3):1.(SUN Min-min,NING Xiao-jun,ZHANG Jian-liang,et al. Research status and progress of energy saving and emission reduction technology for ironmaking[J]. China Metallurgy,2018,28(3):1.)
[3]闫超杰,李福民,郗亚娜,等.炉腹煤气中氢含量对铁矿石滴落过程的影响[J].钢铁研究学报,2017,29(6):441.(YAN Chao-jie,LI Fu-min,QIE Ya-na,et al. Effect of hydrogen content of bosh gas on iron ore dropping process[J]. Chinese Journal of Iron and Steel,2017,29(6):441.)
[4]刘杰,张洪宇,周明顺,等.基于软熔滴落性能的高炉合理炉料结构[J].钢铁,2016,51(9):11.(LIU Jie,ZHANG Hongyu,ZHOU Ming-shun,et al. Rational burden structure of blast furnace based on softening and melting property[J]. Iron and Steel,2016,51(9):11.)
[5] Eng L,Tracy M,Apos O,et al. Lump ore and sinter behaviour during softening and melting[J]. ISIJ International,2011,51(6):930.
[6]左海滨,郭龙飞,王亚杰,等.炉腹角和炉身角对高炉煤气流分布的影响[J].钢铁,2018,53(2):20.(ZUO Hai-bin,GUO Long-fei,WANG Ya-jie,et al. Effect of bosh angle and shaft angle on gas distribution in blast[J]. Iron and Steel,2018,53(2):20.)
[7]吕庆,王福佳,李豪杰.宣钢高炉合理炉料结构熔滴试验[J].钢铁,2016,51(6):19.(LüQing,WANG Fu-jia,LI Hao-jie.Rational burden structure by droplet test in Xuansteel blast furnace[J]. Iron and Steel,2016,51(06):19.)
[8]湛文龙,邸航,孙崇,等.高炉含铁炉料软熔滴落特性的测试装置及方法:中国,CN 201710942258.7[P]. 2017-10-11.(ZHAN Wen-long,DI Hang,SUN Chong,et al. Testing device and method for Softening-melting dropping characteristics of blast furnace iron bearing furnace material:China,CN201710942258.7[P]. 2017-10-11.)
[9]吴胜利,庹必阳,张丽华,等.预还原含铁炉料在高炉内的软熔滴落行为[J].钢铁,2013,48(5):11.(WU Sheng-li,TUO Biyang,ZHANG Li-hua,et al. Softening-melting dropping behavior of pre-reduction iron-bearing burden in blast furnace[J].Iron and Steel,2013,48(5):11.)
[10]陈龙,薛庆国,郭文涛,等.氧气高炉块矿与烧结矿软熔过程交互作用[J].钢铁,2016,51(2):15.(CHEN Long,XUE Qingguo,GUO Wen-tao,et al. Interaction effect between lump and sinter under condition of oxygen blast furnace[J]. Iron and Steel,2016,51(2):15.)
[11]李新宇,张建良,苏步新,等.基于主成分分析的高炉用天然块矿性能评价[J].中南大学学报:自然科学版,2016,47(9):2943.(LI Xin-yu,ZHANG Jian-liang,SU Bu-xin,et al. Performance evaluation of lump ores for blast furnace based on principle component analysis[J]. Journal of Central South University:Natural Science,2016,47(9):2943.)
[12]王晓哲,张建良,刘征建,等.块矿对高炉炉料冶金性能的影响[J].钢铁研究,2017,45(5):1.(WANG Xiao-zhe,ZHANG Jian-liang,LIU Zheng-jian,et al. Influence of lump ore on metallurgical properties of blast furnace burden[J]. Research on Iron and Steel,2017,45(5):1.)
[13] WU S,HAN H,XU H,et al. Increasing lump ores proportion in blast furnace based on the high-temperature interactivity of iron bearing materials[J]. ISIJ International,2010,50(5):686.
[14] Kashihara Y,Iwai Y,Sato T,et al. Effect of unconsumed mixed small coke on permeability in lower part of blast furnace[J].Transactions of the Iron and Steel Institute of Japan,2015,55(6):1237.
[15]左海滨,于文涛,张建良.温度对天然块矿爆裂的影响[J].钢铁,2015,50(5):7.(ZUO Hai-bin,YU Wen-tao,ZHANG Jianliang. Effects of temperature on the decrepitation performance of natural lump ores[J]. Iron and Steel,2015,50(5):7.)
[16]王海涛,李光辉,范晓慧,等.几种高炉炉料冶金性能的对比研究[J].钢铁,2006,41(1):23.(WANG Hai-tao,LI Guanghui,FAN Xiao-hui,et al. Comparative study on metallurgical properties of blast furnace burdens[J]. Iron and Steel,2006,41(1):23.)
[17]吴胜利,王来信,王玉珏,等.含铁炉料间高温交互作用对初渣生成行为的影响[J].工程科学学报,2016,38(11):1546.(WU Sheng-li,WANG Lai-xin,WANG Yu-jue,et al. Influence of high temperature interaction between iron ores on the formation behavior of primary slags[J]. Chinese Journal of Engineering,2016,38(11):1546.)