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Minimax entropy-based co.training for fault diagnosis of blast furnace

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Chinese Journal of Chemical Engineering 2023年第7期59卷 231-239页

作者： Dali Gao Chunjie Yang Bo Yang Yu Chen Ruilong Deng The State Key Laboratory of Industrial co.trol Technology College of Control Science and EngineeringZhejiang UniversityHangzhou 310027China Jianwei Digital Sphere co. LtdLianyungang 222113China Jiangsu Binxin Iron and Steel Group co. LtdChongqing 401220China

Due to the problems of few fault samples and large data fluctuations in the blast furnace(BF)ironmaking process,some transfer learning-based fault diagnosis methods are *** vast majority of such methods perform distribution adaptation by reducing the distance between data distributions and applying a classifier to generate pseudo-labels for ***,since the training data is dominated by labeled source domain data,such classifiers tend to be weak classifiers in the target *** addition,the features generated after domain adaptation are likely to be at the decision boundary,resulting in a loss of classification ***,we propose a novel method called minimax entropy-based co.training(MMEC)that adversarially optimizes a transferable fault diagnosis model for the *** structure of MMEC includes a dual-view feature extractor,followed by two classifiers that co.pute the feature's co.ine similarity to representative vector of each *** transfer is achieved by alternately increasing and decreasing the entropy of unlabeled target samples with the classifier and the feature extractor,*** BF fault diagnosis experiments show that our method improves accuracy by about 5%over state-of-the-art methods.

关键词： co.training Fault diagnosis Blast furnace Minimax entropy Transfer learning

Thermal Insulation Materials of Alumina Based Porous Ceramics

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China's Refractories 2015年第3期24卷 29-33页

作者： YUAN Bo CHEN Kuo HAN Jianshen DONG Binbin WANG Gang LI Hongxia State Key Laboratory of Advanced Refractories Sinosteel Luoyang Institute of Refractories Research Co.Ltd.

Significant energy saving effects can be made through the improvement of furnace refractories,especially the thermal insulation refractories. In this study,the preparation and the application of different alumina based porous ceramics were briefly introduced. Alumina based porous ceramics were prepared co.bined foaming method with gelcasting,sol- gel process or cement curing process. The influences of different preparation methods on the sintering shrinkage, porosity, phase co.position, microstructure, co.pressive strength and thermal co.ductivity were discussed. Alumina based porous ceramics with relatively high strength and low thermal co.ductivity co.ld be obtained through the above mentioned methods. co.pared with the traditional lining materials,about 40% energy co.ld be saved when they were used as the furnace wall.

关键词： thermal insulation alumina based porous ceramics energy saving

Titanium co.tent co.trol for Bearing Steel

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Journal of Iron and Steel Research International 2008年第6期15卷 29-32页

作者： WU Wei LIU Yue LIU Liu XUE Zheng-liang Institute for Metallurgical Technology Central Iron and Steel Research Institute Beijing 100081 China Wuhan Hongshan Haitong Refractories and furnace charge co.Ltd Wuhan 430081 Hubei China Wuhan University of Science and Technology Wuhan 430081 Hubei China

On the basis of the thermodynamic analysis and fundamental study in the laboratory, the equilibrium of the Ti A10 system was investigated. The results showed that the equilibrium titanium co.tent in the steel increased with the increase in the soluble aluminum co.tent in the steel and the TiO2 co.tent in the slag. Although the slag basicity decreased and Al2O3 co.tent in the slag increased, the titanium co.tent increased. Based on these results, the BOF smelting process of low titanium bearing steel was put forward.

关键词： bearing steel titanium co.tent experiment

Mathematical simulation of direct reduction process in zinc-bearing pellets

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1042-1049页

作者： Ying Liu Fu-yong Su Zhi Wen Zhi Li Hai-quan Yong Xiao-hong Feng School of Mechanical Engineering University of Science and Technology Beijing CISDI Industrial furnace co.Ltd.

A one-dimensional unsteady mathematical model was established to describe direct reduction in a co.posite pellet made of metallurgical dust. The model co.sidered heat transfer, mass transfer, and chemical reactions including iron oxide reductions, zinc oxide reduction and carbon gasification, and it was numerically solved by the tridiagonal matrix algorithm （TDMA）. In order to verify the model, an experiment was performed, in which the profiles of temperature and zinc removal rate were measured during the reduction process. Results calculated by the mathematical model were in fairly good agreement with experimental data. Finally, the effects of furnace temperature, pellet size, and carbon co.tent were investigated by model calculations. It is found that the pellet temperature curve can be divided into four parts acco.ding to heating rate. Also, the zinc removal rate increases with the increase of furnace temperature and the decrease of pellet size, and carbon co.tent in the pellet has little influence on the zinc removal rate.

关键词： metallurgical dust ore pellets direct reduction process mathematical models

Preparation and Properties of SiC Assembled Large Block for Blast furnace Tuyeres

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China's Refractories 2023年第4期32卷 1-7页

作者： LYU Chunjiang CHANG Cheng HUANG Yifei CAO Huiyan LI Jie ZHU Chong State Key Laboratory of Advanced Refractories Sinosteel Luoyang Institute of Refractories Research Co.Ltd.Luoyang471039China

A SiC assembled large block for blast furnace tuyeres was prepared using silico. carbide particles(3-1 and 1-0.088 mm)and fine powder(<0.088 mm),silico. powder(<0.088 mm),industrial carbon black(N990),microsilica,ρ-A... 详细信息

A SiC assembled large block for blast furnace tuyeres was prepared using silico. carbide particles(3-1 and 1-0.088 mm)and fine powder(co. powder(co.pared with a silico. nitride bonded silico. carbide brick,a self-bonded silico. carbide brick and an imported self-bonded silico. carbide block to analyze and evaluate their service *** results show that:(1)in the 0-100 mm zone,the SiC large block mainly co.sists ofβ-SiC and nitrides such as O'-SiAlON,β-SiAlON,α-Si_(3)N_(4),and Si_(2)N_(2)O,the bulk density is 2.68-2.70 g·cm^(-3),the apparent porosity is 14%-15%,and the material structure is uniform;(2)in the 0-100 mm zone,β-SiC nano-whiskers intercalate with nitrides;with the depth increasing,the number of flocculentβ-SiC nano-whiskers increases,while the number of nitrides decreases;when the depth reaches 150 mm or more,the main bonding phases areβ-SiC and mullite;(3)co.pared with the reference products,the developed SiC large block has a good basic performance,and after alkali co.rosion,the mass change rate is-0.1%,which is obviously superior to the imported self-bonded silico. carbide and the homemade silico. nitride bonded silico. carbide materials.

关键词： blast furnace for iron-making tuyere silico. carbide alkali co.rosion resistance

Influence of basicity on metallurgical performances of fired super high-grade magnetite pellets in hydrogen-rich gases

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Journal of Iron and Steel Research International 2021年第10期28卷 1212-1222页

作者： Feng Zhang De-qing Zhu Jian Pan Zheng-qi Guo Meng-jie Xu co.lege of Materials and Metallurgy Guizhou UniversityGuiyang550025GuizhouChina School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina sinosteel Equipment&Engineering co. Ltd.Beijing100080China

The influence of basicity on the metallurgical performances and reduction characteristics of fired super high-grade magnetite pellets under the simulated shaft furnace gas co.ditions was *** fired pellets in the basicity range of 0.09(natural basicity)to 1.00 show superior reducibility and low-temperature disintegration ***,in the basicity range of 0.20–0.80,the abnormal swelling of the fired pellets *** basicity from 0.09 to 0.40 promotes the generation of low melting point slag phases and lower porosity of fired pellets,and accelerates the growth and densification of hematite crystals,impeding the reduction of hematite particles and the formation of metallic iron *** addition,the slags that distribute between the hematite particles absorb the reduction stresses by increased distances between the particles during the reduction process,which leads to the large reduction swelling of pellets.

关键词： Ultrafine high-grade magnetite co.centrate Basicity Metallurgical performance Reduction behavior Gas-based shaft furnace direct reduction Fired pellet

Steel Fiber Toughening Mullite-SiC Castables for co.e Dry Quenching furnace co.bel Pillar

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China's Refractories 2017年第1期26卷 24-30页

作者： NI Kangxiang ZHANG Meijie GU Huazhi HUANG Ao LI Hongming SHAO Zhijun The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Yixing furnace Roof Sealer Industry co. Ltd.

The mullite-SiC castables for co.e dry quenching（CDQ）furnace co.bel pillar were prepared by taking mullite and silico. carbide as aggregates,silico. carbide powder,fused silica powder,α-Al2O3powder and silica fume as matrix,calcium aluminate cement as binding system,and extra-adding steel fibers to extend the CDQ furnace refractory *** effects of steel fiber types（melt pumping meniscus,cut straight,wavy indentation,co.d-drawn hook）and steel fiber extra-additions（0,1%,2%,3%by volume）on the properties of mullite-SiC castables were *** the toughening mechanism of steel fiber in the castables was analyzed acco.ding to the load-displacement *** results show that：（1）the toughening effects of the melt pumping meniscus steel fiber with rough surface and co.ddrawn hook steel fiber with strong anchoring effect with the matrix are better than those of cut straight steel fiber and wavy indentation steel fiber;（2）the suitable amount of steel fiber（less than 2%）in mullite-SiC castables not only significantly improves the mechanical properties,thermal shock resistance and wearing resistance,but also improves the fracture energy by 49.0%and slows the crack growth;（3）the bond strength and mechanical anchoring force between steel fiber and castable interface are key elements of steel fiber reinforced castables.

关键词： co.e dry quenching steel fiber mullite-silico. carbide castable toughening mechanism

Study on the co.rosion of refractory materials by co.l blended with the extraction residue of direct co.l liquefaction in a simulated gasification atmosphere

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Clean Energy 2021年第4期5卷 731-740页

作者： Baozi Peng Shixian Zhao Zhen Liu National Institute of Clean and Low Carbon Energy Beijing 102211China State Key Laboratory of Advanced Refractories Sinosteel Luoyang Institute of Refractories Research Co.Ltd.Luoyang 471039 HenanChina

Utilizing the extraction residue(ER)of direct co.l liquefaction residue as a gasification feedstock has significant eco.omic *** the characteristic of high ash and iron in the ER would increase the risk of co.rosion of the refractory materials and affect the long-term operation of the *** this work,co.rosion experiments of molten slag derived from a mixture of 20 wt%ER and 80 wt%co.l on a high-chromia refractory brick and SiC brick were carried out using a rotary-drum furnace in a simulated gasification *** experimental results show that the visco.ity of the poured slag is larger as co.pared to the initial ash sample at the same temperature,which suggests that the visco.ity-temperature relationship of the poured slag should be used as the reference for the operation temperature of the gasifier to ensure that the slag can flow during *** a high-chromia refractory brick,iron oxides in molten slag co.ld react with Cr_(2)O_(3) in the refractory matrix but,because the aggregate was not found to be damaged,the damage to the matrix structure was the key factor for causing the co.rosion of the high-chromia refractory *** iron was observed in the exposed SiC brick,which indicated that the reaction between the iron oxides in the slag and SiC occurred,forming metallic iron and SiO_(2).The co.rosion of a SiC brick by molten slag depended mainly on the dissolution of Al_(2)O_(3) particles and the reaction between iron oxides in the molten slag and SiC ***,the high iron co.tent in co.l ash had a serious influence on the co.rosion of refractory *** efforts need to be made on co.l blended with ER as a gasification feedstock in the future.

关键词： co.rosion gasification refractory slag direct co.l liquefaction residue extraction residue

co.parison study of slag co.rosion resistance of MgO–MgAl_(2)O_(4),MgO–CaO and MgO–C refractories under electromagnetic field

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Journal of Iron and Steel Research International 2021年第1期28卷 38-45页

作者： Xin‑ming Ren Bei‑yue Ma Shi‑ming Li Hong‑xia Li Guo‑qi Liu Wen‑gang Yang Fan Qian Shi‑xian Zhao Jing‑kun Yu Key Laboratory for Eco.ogical Metallurgy of Multimetallic Mineral(Ministry of Education) School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Advance Refractories Sinosteel Luoyang Institute of Refractories Research Co.Ltd.Luoyang 471039HenanChina

To illuminate the co.rosion behavior of MgO-based refractories under electromagnetic field(EMF),herein,the slag co.rosion and penetration resistance of MgO–MgAl_(2)O_(4),MgO–CaO,and MgO–C refractories were investigated using the rotary immersion slag resistance test at 1873 K for 1 *** results showed that the order of the good slag resistance of as-tested refractories was MgO–C>MgO–CaO>MgO–MgAl_(2)O_(4).The EMF accelerated the co.rosion and penetration of slag to the refractories,which caused the molten slag to be easier into the refractories by natural co.vection and Marangoni *** addition,the MgO–C refractories did not show an overwhelming advantage in slag resistance because EMF impeded the formation of the dense protection ***,in view of the present results,the MgO–C refractories are still the most promising slag line material for refining furnace among MgO–MgAl_(2)O_(4),MgO–CaO,and MgO–C refractories.

关键词： MgO-based refractory co.rosion Basic slag Electromagnetic field