Theoretical and practical research on relationship between blast air condition and hearth activity in large blast furnace

2020 ◽  
Vol 117 (1) ◽  
pp. 113 ◽  
Author(s):  
Bing Dai ◽  
Hong-ming Long ◽  
Yi-long Ji ◽  
Jia-ting Rao ◽  
Yun-cai Liu
Keyword(s):  
Blast Furnace ◽  
Kinetic Energy ◽  
Raw Materials ◽  
Volume Ratio ◽  
Operation Condition ◽  
Extensive Experience ◽  
Air Volume ◽  
Blast Furnace Production ◽  
Air Speed

From the results calculated by theoretical derivations, it was found that the characteristics of tuyere raceway determined by the operation condition for blast air played a critical effect on the heart activity. The speed and kinetic energy of blast air should be proportional to the volume of blast furnace (BF), and the comprehensive optimization of air volume and tuyere which should vary with the quality of raw materials was essential. The calculation methods of air volume ratio and coefficient for different BFs were put forward. Moreover, the details on hearth activity recovery of a 4747 m3 blast furnace in China were elaborated. Based on the extensive experience in blast furnace production, the various phenomena used to judge air speed and kinetic energy whether reasonable were discussed. In summary, hearth activity was closely related to the characteristics of BF raceway and reasonable air speed and kinetic energy could effectively improve the activity.

Research on the Magnetizing Roasting and Magnetic Separation of Blast Sludge

2014 ◽  
Vol 644-650 ◽  
pp. 5451-5454
Author(s):  
Xu Bai ◽  
Shu Ming Wen ◽  
Shao Jun Bai ◽  
Chao Lv ◽  
Peng Xiang Zhang
Keyword(s):  
Experimental Study ◽  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Optimum Conditions ◽  
High Iron Content ◽  
Magnetic Current ◽  
Blast Furnace Production ◽  
Magnetizing Roasting ◽  
Roasting Time

In the blast furnace production process, the high iron content in the sludge produced by collecting, Iron can be used as recycled raw materials. Experimental study found that the use of magnetic roasting - weak magnetic iron powder method of recovering technology is feasible. The optimum conditions are: the grinding fineness is 87%, calcination temperature is 750 °C, roasting time is 25min, magnetic current is 1.5A under conditions to obtain a grade of 59% recovery rate of 79.3% iron ore .

The Production and Utilization of Two Smelting Processes for V-Ti Magnetite

2014 ◽  
Vol 881-883 ◽  
pp. 1297-1300
Author(s):  
Zhao Hui Zhang ◽  
Wei Ming Kong ◽  
Fu Cai Zhao ◽  
Xi Dong Xie
Keyword(s):  
Blast Furnace ◽  
Large Scale ◽  
Raw Materials ◽  
Direct Reduction ◽  
Mineral Resources ◽  
High Energy ◽  
Rotary Hearth Furnace ◽  
Hearth Furnace ◽  
Product Price ◽  
Blast Furnace Production

In this paper, two processes for V-Ti magnetite smelting were introduced, the processes respectively are the conventional blast furnace-BOF process and the high-profile rotary hearth furnace direct reduction technology. The two kinds of processes were introduced briefly, and the problems of the two processes in the production of V-Ti magnetite were analysed. The blast furnace-BOF process with the relatively perfect, large output, high energy efficiency can't make full use of Ti in the mineral resources, in this way, the resource was wasted and the environmental were polluted, and the existence of Ti in slag can also bring a series of problems in blast furnace production. Rotary hearth furnace direct reduction technology has the advantages of high reduction temperature, low product price, flexible selection for raw materials and reducing agent, while the large scale of equipment brings a series of problems to the production and design.

scholarly journals Quality of Coke used in Blast Furnace Process – Analysis of Selected Parameters

2019 ◽  
Vol 1 (1) ◽  
pp. 602-609
Author(s):  
Edyta Kardas ◽  
Pavlína Pustějovská
Keyword(s):  
Blast Furnace ◽  
Alternative Fuels ◽  
Raw Materials ◽  
Process Analysis ◽  
Coal Dust ◽  
Quality Parameters ◽  
Pig Iron ◽  
Blast Furnace Process ◽  
Furnace Process

Abstract The basic economic goal of pig iron process is to produce a finished product at the highest possible quality and at the lowest possible cost. The quality of pig iron depends on the quality of raw materials used in the process, quality of fuels and process parameters. The cost of fuel is one of the basic component of cost of pig iron production. Therefore, consumption of fuels should be minimized while maintaining its high quality. The main technological fuel of this process is blast furnace coke. Very often, cheaper alternative kinds of fuels are used in the form of finer sorts of coke or alternative fuels (e.g. coal dust). However, they can be used only in a limited amount. The aim of the paper is the assessment of the selected quality parameters of stabilized coke used in the blast furnace process and the comparison of their values with requirements.

scholarly journals Влияние качества агломерата и кокса на технико-экономические показатели доменной плавки

2018 ◽  
pp. 17-24
Author(s):  
D.A. Kassim ◽  
A.K. Tarakanov ◽  
V.P. Lyalyuk ◽  
P.I. Otorvin ◽  
A.A. Gusev
Keyword(s):  
Blast Furnace ◽  
Gas Flow ◽  
Gas Permeability ◽  
Raw Materials ◽  
Mechanical Energy ◽  
Blast Furnaces ◽  
Depth Of Penetration ◽  
Total Mechanical Energy ◽  
Blowing Regime

Purpose: Compare the results of blast furnace smelting efficiency, when chang-ing the qualitative characteristics of the sinter and coke, and the calculated param-eters of the blowing regime of melting. Methodology: Analysis of technical and economic performance of blast furnaces during periods of work on the agglomerate with different metallurgical characteris-tics and different diameter of the tuyeres. Findings: The experience of blast furnaces with a volume of 2,700 and 2,000 m3 confirmed a known fact of the dependence of furnace efficiency and coke consump-tion not only through the quality of charge materials, but also through the distribu-tion of the gas flow along the furnace section. Originality: The technological analysis of the results of the operation of blast furnaces with the volume of 2700 and 2000 m3 with a change of the quality of the sinter and pellets in combination with the change of the blowing regime parame-ters was performed. On the basis of the performed analysis, it was confirmed the expediency of increasing the gas permeability of the charge by improving the quali-ty of the raw materials while increasing the total mechanical energy of the com-bined gas-blast and hearth-gas, which are responsible for the length of the com-bustion zone and the depth of penetration of the gas flow to the center of the blast furnace. Practical value: Alternation of tuyeres of different diameters along with the im-provement of the quality characteristics of charge materials, additionally contrib-utes to the enhancement of the positive effect due to the expansion of the combus-tion zones in the furnace hearth. And if in this case the total mechanical energy of the mountain gas rises and the depth of penetration of the furnace gas to the fur-nace axis increases, the effect of using high-quality raw materials can be maxim-ized. Keywords: agglomerate, coke, blowing, tuyeres, gas permeability, quality, total energy.

scholarly journals Increasing the efficiency of blast-furnace smelting by improving the quality of iron ore materials

2019 ◽  
pp. 43-60
Author(s):  
A.S. Nesterov ◽  
L.I. Garmash
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Chemical Composition ◽  
Coke Consumption ◽  
Iron Ore ◽  
Raw Materials ◽  
Blast Furnace Smelting ◽  
Blast Furnace Dust ◽  
Sinter Mixture

It is noted in the work that when mastering the technology of pulverized coal injection (PUT) at the metallurgical enterprises of Ukraine, it is necessary to intensify work, including research, in the direction of improving the quality characteristics of the sinter, the stability of its chemical composition and strength parameters. The analysis of the quality of iron ore raw materials used in sintering production in Ukraine and foreign countries is carried out. The requirements of international and domestic standards for the quality of raw materials and fuels, providing for the injection of large quantities of firearms into the furnace, are given. A methodology for determining the quality of raw materials developed in the HMI is described. The results of a study of the quality of iron ore raw materials according to the developed method are presented. Based on the analysis of the results of the research, requirements were developed for the quality of granular iron ore wastes and their rational amount in the composition of the sinter charge, and the process for the production of granules was developed. Recommendations have been developed on the use in the sinter mixture of a part of the granular components of secondary waste, which allowed to increase the content of secondary resources in the mixture. As a result, the chemical composition of the sinter was stabilized, its strength was improved, the yield of sinter of the second grade was reduced, the removal of blast furnace dust and coke consumption were reduced. Improving the quality of the sinter and the rational distribution of charge materials over the cross-section of the top of the blast furnace allows for self-renewal of the protective skull, to reduce the removal of top dust by 4.3 kg / t of cast iron, and to reduce coke consumption by 19.6 kg / t of cast iron. The developed measures make it possible to increase the competitiveness of products, even at the additional cost of preparing the sinter mixture for sintering.

Measurement of erosion state and refractory lining thickness of blast furnace hearth by using three-dimensional laser scanning method

2020 ◽  
Vol 118 (1) ◽  
pp. 106
Author(s):  
Lei Zhang ◽  
Jianliang Zhang ◽  
Kexin Jiao ◽  
Guoli Jia ◽  
Jian Gong ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Laser Scanning ◽  
Refractory Lining ◽  
Three Dimensional ◽  
3D Laser Scanning ◽  
Scanning Method ◽  
Blast Furnace Production ◽  
Severe Erosion ◽  
Residual Thickness ◽  
Minimum Depth

The three-dimensional (3D) model of erosion state of blast furnace (BF) hearth was obtained by using 3D laser scanning method. The thickness of refractory lining can be measured anywhere and the erosion curves were extracted both in the circumferential and height directions to analyze the erosion characteristics. The results show that the most eroded positions located below 20# tuyere with an elevation of 7700 mm and below 24#–25# tuyere with an elevation of 8100 mm, the residual thickness here is only 295 mm. In the circumferential directions, the serious eroded areas located between every two tapholes while the taphole areas were protected well by the bonding material. In the height directions, the severe erosion areas located between the elevation of 7600 mm to 8200 mm. According to the calculation, the minimum depth to ensure the deadman floats in the hearth is 2581 mm, corresponding to the elevation of 7619 mm. It can be considered that during the blast furnace production process, the deadman has been sinking to the bottom of BF hearth and the erosion areas gradually formed at the root of deadman.

Blast Furnace In Engineering Education

2014 ◽  
Vol 1 (1) ◽  
pp. 127-130 ◽  
Author(s):  
Valentin Petrescu ◽  
Florian Popescu ◽  
Alina Gligor
Keyword(s):  
Blast Furnace ◽  
Human Computer Interaction ◽  
Blended Learning ◽  
Engineering Education ◽  
Learning Environments ◽  
Learning Method ◽  
Quality Of Presentation ◽  
Computer Interaction

AbstractUsing blended learning method, Blast Furnace subject was analysed inside the DidaTec Project. The analysed factors were the quality of presentation, quantity of information per page and human – computer interaction. The analysis shows the preference of students to work with different learning environments.

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