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Improving mathematical model of burden distribution and correcting chute angle to cope with fluctuation of stock line

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Journal of Iron and Steel research(International) 2024年第2期31卷 342-356页

作者： Jian-sheng Chen Wen-guo Liu Hao Guo Wang Ding Qing-guo Xue Jing-song Wang Hai-bin Zuo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China mcc capital engineering&research incorporation limited Beijing100176China Hunan Valin Xiangtan Iron and Steel Co. Ltd.Xiangtan411101HunanChina

Accurate evaluations of the burden distribution are of critical importance to stabilize the operation of blast *** mathematical model and discrete element method(DEM)are two attractive methods for predicting burden *** on DEM,the initial velocities of the pellet,sinter,and coke were calculated,and the velocity attenuations of the above three particles between the burden and the chute were *** initial velocity and velocity attenuation were applied to a mathematical model for improving the ***,based on the improved model,a scheme for rectifying the chute angles was proposed to address the fluctuation of the stock line and maintain a stable burden *** validity of the scheme was confirmed via a stable burden distribution under different stock *** mathematical model has been successfully applied to evaluate the online burden distribution and cope with the fluctuation of the stock line.

关键词： Burden distribution Mathematical model Discrete element method Velocity attenuation Stock line fluctuation

Review on biomass metallurgy:Pretreatment technology,metallurgical mechanism and process design

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1133-1149页

作者： Jianliang Zhang Hongyuan Fu Yanxiang Liu Han Dang Lian Ye Alberto N.Conejio Runsheng Xu School of Metallurgical and Ecological engineering University of Science and Technology BeijingBeijing 100083China mcc capital engineering&research incorporation limited Beijing 100176China

The metallurgy industry consumes a considerable amount of coal and fossil fuels,and its carbon dioxide emissions are increasing every *** coal with renewable,carbon-neutral biomass for metallurgical production is of great significance in reducing global carbon *** study describes the current state of research in biomass metallurgy in recent years and analyzes the concept and scientific principles of biomass *** fundamentals of biomass pretreatment technology and biomass metallurgy technology were discussed,and the industrial application framework of biomass metallurgy was ***,the economic and social advantages of biomass metallurgy were analyzed to serve as a reference for the advancement of fundamental theory and industrial application of biomass metallurgy.

关键词： biomass pretreatment technology blast furnace ironmaking direct reduction new process design benefit assessment

珊瑚骨料种类和混杂纤维对珊瑚混凝土强度与断裂性能的影响

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Journal of Central South University 2024年第5期31卷 1592-1607页

作者：王振波刘伟康左建平韩宇栋李鹏飞郝如升 School of Mechanics and Civil engineering China University of Mining and TechnologyBeijing 100083China State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources China University of Mining and TechnologyBeijing 100083China Central research Institute of Building and Construction MCC Group Co.Ltd.Beijing 100088China

海水珊瑚骨料混凝土(SCAC)由珊瑚礁砂石、海水等海洋地域性原材料与胶凝材料混合制备而成,在海洋国家的国防和基础设施建设中展现出缩短工期、降低成本、减少能源消耗的优势。但SCAC性脆易裂,珊瑚骨料的制约作用随着混凝土强度等级的提... 详细信息

海水珊瑚骨料混凝土(SCAC)由珊瑚礁砂石、海水等海洋地域性原材料与胶凝材料混合制备而成,在海洋国家的国防和基础设施建设中展现出缩短工期、降低成本、减少能源消耗的优势。但SCAC性脆易裂,珊瑚骨料的制约作用随着混凝土强度等级的提高而更加显著。本文探究了两种不同类型的珊瑚骨料对SCAC性能的影响,并将柔性的聚乙烯醇(PVA)纤维和刚性的钢纤维混杂,以期提升SCAC的强度、韧性与断裂性能。结果表明,含低强珊瑚骨料的SCAC抗压强度比含高强珊瑚骨料的SCAC抗压强度降低了30.8%(从55.6降至38.5 MPa),掺入纤维可以在一定程度上缓解骨料自身缺陷对SCAC强度的影响。此外,提出了一种新的本构模型来描述SCAC的应力-变形关系,模型预测结果与试验数据吻合较好。相比于不掺纤维的对照组,掺入0.1%、0.2%和0.3%PVA纤维的SCAC的断裂能分别提高了10%、49%和88%。在纤维用量相同时,混杂纤维组的断裂能比单掺纤维组高46%。

关键词：海水珊瑚骨料混凝土混杂纤维珊瑚骨料强度应力-应变曲线断裂性能

Flexible Power Supply System of AC Electric Arc Furnace

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Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 622-633页

作者： Chongbin Zhao Qirong Jiang Dong Liu Department of Electrical engineering Tsinghua UniversityBeijing 100084China capital engineering&research incorporation Ltd. Beijing 100176China

The AC electric arc furnace(EAF)is becoming a core apparatus of the modern steel ***,it used to be a major threat of power quality in the traditional power supply *** this paper,a flexible power supply system of the AC EAF is proposed,which is expected to completely alter its inherent cognition of impact load in the power *** basics of the power supply for EAF are first reviewed and the novel techniques to enhance the operation flexibility of EAF are *** power circuit and the control structure are then presented,followed by the detailed strategies of various operations fully considering the features of EAF.A large disturbance stability criterion based on the mixed potential theory is also established for the practical *** electromagnetic transient simulations using PSCAD and benefit analyses verify the feasibility of the proposed system.

关键词： Electric arc furnace(EAF) power electronics control power quality power supply system stability analysis

Mathematical model of burden distribution for the bell-less top of a blast furnace

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International Journal of Minerals,Metallurgy and Materials 2013年第7期20卷 620-626页

作者： Zhao-jie Teng Shu-sen Cheng Peng-yu Du Xi-bin Guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing mcc capital engineering and research incorporation limited Xuanhua Iron and Steel Company

Due to the difficulty in measuring the burden trajectory directly in an actual blast furnace （BF）, a mathematical model with Coriolis force and gas drag force considered was developed to predict it. The falling point and width of the burden flow were obtained and analyzed by the model, the velocities of particles at the chute end were compared with and without the existence of Coriolis force, and the effects of chute length and chute torque on the falling point were also discussed. The simulation results are in good agreement with practical measurements with laser beams in a 2500 m3 BF.

关键词： blast furnaces burden trajectories mathematical models Coriolis force

Relationship between crystallographic structure of complex inclusions MgAl_(2)O_(4)/Ti2O_(3)/MnS and improved toughness of heat-affected zone in shipbuilding steel

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Journal of Iron and Steel research(International) 2022年第8期29卷 1277-1290页

作者： Yan Wang Li-guang Zhu Jin-xia Huo Qing-jun Zhang Yao-guang Wu Wei Chen Shuo-ming Wang College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210HebeiChina College of Materials Science and engineering Hebei University of Science and TechnologyShijiazhuang 050018HebeiChina China Analysis and Testing Center North China University of Science and TechnologyTangshan 063210HebeiChina mcc capital engineering&research incorporation limited Metallurgical Engineering Consulting and Design DivisionBeijing 100176China

In accordance with the minimum degree of disregistry mechanism in oxide metallurgy, the intragranular acicular ferrite (IAF) generated by microalloying elements in austenite was studied. Herein, the effect of Mg treatment on the microstructure and toughness of the heat-affected zone (HAZ) in shipbuilding steel was investigated. Mg treatment produced inclusions that influenced the formation of acicular ferrite in the microstructure. This refined the HAZ microstructure and improved its toughness. Electron backscatter diffraction was used to determine the oxides of titanium and the MgO Al_(2)O_(3) or MgAl_(2)O_(4) complex inclusions that induced the formation of IAF. MnS precipitated on MgAl_(2)O_(4) on a specific habit plane and in a specific direction. MnS had a specific orientation relationship with MgAl_(2)O_(4), i.e., f100gMgAl_(2)O_(4) //{100}MnS. The 35-mm-thick plate obtained in the industrial test after welding at a welding heat input of 120 kJ/cm had an average impact absorbed energy of 282.7 J at - 40 ℃ and 2 mm from the weld joint in the HAZ. The twodimensional disregistry index between inclusions can be used as the basis for controlling their distribution and adsorption force. Microalloy addition in the order of Al-Mg-Ti is key to obtaining abundant dispersion and fine nucleation in austenite.

关键词： High heat input welding Mg treatment Disregistry mechanism Heat-affected zone

Effect of Chute Rotation on Particles Movement for Bell-less Top Blast Furnace

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Journal of Iron and Steel research(International) 2013年第12期20卷 33-39页

作者： TENG Zhao-jie CHENG Shu-sen ZHAO Guo-lei DU Peng-yu State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological engineering University of Science and Technology Beijing mcc capital engineering and research incorporation limited

For the bell-less top blast furnace, when particles move along the chute, the particlesr motion direction and the frictional force acting on them will change due to the chute rotation, which consequently influences the velocity at the tip of chute, changes the burden flow width and impact point, and finally affects the stock profile and gas f[ow distribution. So the influence of chute rotation needs to be considered when calculating the burden trajectory with a mathematical model. The mathematical model was established to analyze the influence of Coriolis force on particle velocity at chute tip as well as height and width of burden flow in chute, and to summarize the effect of Coriolis force on burden distribution, thereby making the calculation result more accurate.

关键词： chute rotation burden flow width blast furnace particle movement

Effects of CaO on Precipitation Morphology of Metallic Iron in Reduction of Iron Oxides Under CO Atmosphere

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Journal of Iron and Steel research(International) 2013年第7期20卷 16-24页

作者： ZHAO Zhi-long TANG Hui-qing GUO Zhan-cheng State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Iron and Raw Material Handling Division MCC Capital Engineering and Research Incorporation

Growth process of iron whiskers and mechanism of CaO influence on precipitation morphology of metallic iron at the gas-solid interfaces was studied. Analytical reagents of Fe（NO3）3 and Ca（NO3）2 aqueous solution were used to prepare sheet film sample of Fe2 O3-CAO by thermal decomposition at high temperature. In-situ observation was con-ducted using a stereo optical microscope and a hot-stage. And reduction kinetics of samples was studied by thermo gravimetrie （TG） method. Some samples after reduction were analyzed by using the scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and fourier transform infrared （FT-IR） spectrometer. Results indi-cate that during the reduction of iron oxides with CO, metallic iron is mostly precipitated as whisker and the precipi- tation behavior mainly depends on reduction rate. Doping CaO can significantly increase the reduction rate and effec-tively change the precipitation morphology of metallic iron after the reduction. When CaO doping concentration is less than 4% （mass percent）, CaO can promote whisker formation of reduced iron; as it reaches 6% （mass per- cent）, CaO inhibits iron whiskers growth; as it is more than 8% （mass percent）, no whiskers could be observed. Therefore, controlling the quantity of Ca^2＋ is effective to control the formation and growth of iron whiskers during gaseous reduction and thus eliminating ore grain sticking caused by intertexture of iron whiskers.

关键词： stereo optical microscopes in-situ observations gaseous direct reductions iron whiskers sticking

Simplified Algorithm for Out-of-Plane Critical Loads of CFST Solid-Rib Arch

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Journal of Donghua University(English Edition) 2015年第5期32卷 782-786,806页

作者：陈昀明韦建刚黄蕾李晓辉陈宝春 College of Civil engineering Fuzhou University Plant Layout and Transportation Devision Capital Engineering & Research Incorporation Limited

The simplified algorithm for out-of-plane ultimate loadcarrying capacity of concrete-filled steel tubular( CFST) solid-rib arches under uniform vertical load was studied. The experimentally validated finite element model was developed. The out-of-plane equivalent length coefficients of solid-rib arches were obtained using out-of-plane elastic eigenvalue buckling analysis. Then the out-ofplane elastic stability coefficient was plotted against the normalized slenderness ratio,and the out-of-plane eigenvalue buckling load or elastic buckling capability of arches was calculated. Lastly effects of different parameters on the out-of-plane ultimate load-carrying capacity of CFST solid-rib arches were determined using geometric and material nonlinear finite element analysis, and a simplified algorithm was established by fitting the out-of-plane elastic-plastic stability coefficient and normalized slenderness ratio using PerryRobertson formula. Ratio of the elastic stability coefficient to the elastic-plastic counterpart was plotted against the out-of-plane normalized slenderness ratio,from which the out-of-plane elasticplastic ultimate load-carrying capacity was determined according to the corresponding elastic buckling load. Results show that the proposed simplified algorithm can accurately predict the out-of-plane eigenvalue buckling load and the elastic-plastic ultimate loadcarrying capacity of the CFST solid-rib arches.

关键词： concrete-filled steel tubular(CFST) solid-rib arch out-of-plant buckling ultimate load-carrying capacity simplified algorithm