Study of transient processes in a blast furnace based on the heat exchange scheme analysis

2020 ◽  
Vol 76 (2) ◽  
pp. 132-138
Author(s):  
N. A. Spirin ◽  
O. P. Onorin ◽  
A. S. Istomin ◽  
I. A. Gurin
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Heat Exchange ◽  
Natural Gas ◽  
Iron Ore ◽  
Thermal Conditions ◽  
Transient Processes ◽  
Hot Metal ◽  
Ore Load ◽  
Hot Blast

A blast furnace is a complicated metallurgical facility, which is characterized by considerable delay and inertia in the flow of heat and mass exchange. Therefore, the analysis of transient processes based on modern ideas about heat transfer is an important issue in solving technological problems of blast furnace smelting managing. A two-stage heat transfer scheme along the height of a blast furnace of modern technology presented. When studying the thermal state of a blast furnace as a control object, it is advisable to divide it into two thermal zones - the upper zone and the lower zone. The border between the zones is located in the upper part of the mixed reduction region, between the start level of coke carbon gasification and the horizon below which iron oxides are directly reduced. It was shown, that the upper and lower thermal zones have fundamental differences in heat exchange conditions and are interconnected through the index of iron direct reduction degree. The transient processes of silicon variation in the hot metal studied at variation of iron ore load, natural gas flow rate, temperature and humidity of the hot blast, oxygen content in the hot blast and slag basicity. It was shown that the oscillatory transition process is observed in case, after applying the perturbation, it will have the opposite effect on the thermal conditions of the lower and the upper stages of heat exchange in the blast furnace. The iron ore load, hot blast humidity and slag basicity were found to be the most predictable input parameters affecting the concentration of silicon in hot metal. Change in oxygen concentration in hot blast and natural gas consumption have an alternating character of influence on thermal conditions of the blast-furnace hearth. At that, the characteristics of the transient processes of blast furnaces through various channels of action vary and depend significantly on the properties of the smelted raw materials, design and operational parameters of the furnaces

Study on the Flow Field of Jet Plug-in Hot Blast Furnace

2011 ◽  
Vol 354-355 ◽  
pp. 564-568
Author(s):  
Xue Ping Wang ◽  
Zhen Wei Zhang ◽  
Cheng Zhang ◽  
Hong Bo Zhang
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Heat Exchange ◽  
Flow Field ◽  
Flue Gas ◽  
Structure Design ◽  
Direct Effects ◽  
Element Analysis ◽  
Flow Situation ◽  
Hot Blast

This paper primarily focuses on the analysis on the heat exchange part’s flow field of the jet plug-in hot blast furnace, and comprehensively considers the temperature field aiming at obtaining the velocity and pressure distribution of the air and flue gas in each part of the heat transfer. Heat exchange mainly takes advantage of thermal convection about high temperature flue gas of the hot blast furnace and air, the flow situation of which have the direct effects on the heat exchange result in the heat transfer. The authors implemented the numerical simulation on flow field of the jet plug-in hot blast stove in heat transfer by using the method of finite element analysis. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

Adjustment of a technology of cast iron smelting in the blast furnace of jsc "ural steel" w ith a volume of 1232 см3 with charge h a v in g 95% share of Mikhailovskii GOK pellets

2021 ◽  
Vol 77 (7) ◽  
pp. 768-775
Author(s):  
I. F. Iskakov ◽  
G. A. Kunitsyn ◽  
D. V. Lazarev ◽  
А. А. Red`kin ◽  
S. A. Trubitsyn ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Raw Material ◽  
Material Base ◽  
Hot Metal ◽  
Charging System ◽  
Iron Smelting ◽  
Gas Consumption ◽  
A Charge

To use effectively internal raw material base, JSC “Ural Steel” accomplished I category major overhaul of the blast furnace No. 2. The main purpose of the overhaul was to design a rational profile which could ensure an ability to operate with a charge containing 95 % of Mikhailovskii GOK (mining and concentrating plant) pellets having basicity of 0.5 by CaO/SiO2. The blast furnace No. 2 having useful volume of 1232 m3, was constructed by design of Danieli Corus, the Netherlands, and was blown in on December 30, 2020. In the process of guarantee tests, step-by-step increase of Mikhailovskii GOK pellets (Fetotal = 60.5 %, CaO/SiO2 = 0.5) content in the charge iron ore part was being accomplished from 55 to 95.1%. Charging of the blend containing pellets in the amount of 55% of iron ore part, was done by charging system 4OOCC + 1COOCC (Ore - Coke) with filling level 1.5 m. Under conditions of pellets part increase in the blend, the charging system was changed to decrease their content at the periphery, to increase it in the ore ridge zone and make it intermediate between periphery and the ore ridge. At the pellets share in the iron ore raw materials 0.75 the charging system was used as the following: 3OOCC + 1COOC + 1COOCC, while at the content 95.1% the following charging system was used: 2COOC + 2COOC + 1COOCC. It was noted that in the period of guarantee tests the furnace running was smooth. The average silicon content in the hot metal was 0.70% at the standard deviation 0.666. Sulfur content in the hot metal did not exceed 0.024%, the blowing and natural gas consumption figures were 2100 m3/min and 11000 m3/min correspondently, oxygen content in the blowing 26.5%, hot blowing and top smoke pressure figures were 226.5 and 109.8 KPa correspondently. The productivity of the furnace was reached as high as 2358 t/day at the specific coke rate 433 kg/t of hot metal. After guarantee tests completion, the pellets content in the iron ore part was decreased gradually from 95 down to 50%. The decreasing was made by 5% in every 6 hours of operation. Application of the mastered technology of the blast furnace No. 2 with the increased share of pellets will enable to stably supply the blast furnaces No. 1, 3 and 4 by iron ore raw materials in the proportion of 30-35% of pellets and 65-70% of sinter.

scholarly journals Influence of Hot Metal Flow on the Heat Transfer in a Blast Furnace Hearth

1985 ◽  
Vol 71 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Jiro OHNO ◽  
Masaharu TACHIMORI ◽  
Masakazu NAKAMURA ◽  
Yukiaki HARA
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Metal Flow ◽  
Hot Metal ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

scholarly journals Effect of the natural gas hydrogen on variation of the heat and reducing processes along the blast furnace radius

2020 ◽  
Vol 76 (1) ◽  
pp. 41-49
Author(s):  
S. P. Rogozhnikov ◽  
I. S. Rogozhnikov
Keyword(s):  
Blast Furnace ◽  
Natural Gas ◽  
Peripheral Zone ◽  
Technology Study ◽  
Furnace Process ◽  
Blast Furnace Coke ◽  
Furnace Gases ◽  
Furnace Technology ◽  
Ore Load ◽  
The Mathematical Model

The expenses for the blast furnace coke are one of most significant part of the hot metal cost. To save the coke, various technologies are used, capable to replace the coke by cheaper additional fuel (AF), in particular by natural gas (NG). The injection of considerable volumes of NG results in an increase of hydrogen share in the blast furnace gases and in a significant variation in the blast furnace technology. Study of peculiarities of such variations is necessary to use the NG more effectively. Based on the mathematical model of the blast furnace process, estimation of the effect of natural gas hydrogen on changes in the heat and reducing processes along the blast furnace radius was accomplished. A formula was elaborated, confirmed by practice, for calculating the degree of hydrogen usage ηН2 along the radius of the furnace. It was determined, that the reducing action of hydrogen along the furnace radius takes place unevenly –decreasing from the periphery to the axial zone of the blast furnace. To estimate the quantitative relations of the reducing action of hydrogen, parameters of the PAO “MMK” and PAO “ArcelorMittal Krivoy Rog” blast furnaces for a long period of operation were analyzed. It was determined, that in the axial and intermediate zones of a blast furnace, values of criterion RН2, designating the oxygen share in the burden removed by hydrogen, are in the range of 0.11–0.16 and weakly depend on the NG consumption. In the peripheral zone near the walls, the value of R Н 2 sharply increases to 0.22–0.27. In this zone of the blast furnace the quantity the burden oxygen, removed by hydrogen, accounts for 80–85%. Therefore, hydrogen accomplished the heat and reducing processes mainly in the peripheral zone of the furnace. At the NG consumption increase, the ore load should be increased for the peripheral zone, near the walls individually accounting hydrogen action along the furnace radius. This will make possible to increase the degree of hydrogen usage and decrease the coke consumption.

Study on the Temperature Field of Jet Plug-in Hot Blast Furnace

2011 ◽  
Vol 338 ◽  
pp. 231-235
Author(s):  
Xue Ping Wang ◽  
Zhen Wei Zhang ◽  
Hong Bo Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Temperature Field ◽  
Blast Furnace ◽  
Heat Exchange ◽  
Negative Impact ◽  
Structure Design ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Hot Blast

This paper primarily focuses on the analysis on the heat exchange part’s temperature field of the jet plug-in hot blast furnace aiming at obtaining the temperature distribution of the heat exchange part. The authors took advantage of the method of the finite element analysis to study the temperature field. Through the analysis, local high temperature of the heat exchange part can be figured out. The paper also analyzes the parts with great temperature difference, study the reasons of causing these phenomenon and the negative impact on the furnace. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

Numerical Simulation of Liquefied Natural Gas in Rib-Tube

2013 ◽  
Vol 483 ◽  
pp. 162-165
Author(s):  
Su Hou De ◽  
Zhang Yu Fu ◽  
Ji Yong Che ◽  
Xiao Long Wen
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Natural Gas ◽  
Liquefied Natural Gas ◽  
Dispersed Phase ◽  
Wall Function ◽  
Governing Equations ◽  
Set Up

The flow of liquefied natural gas (LNG) which was coupled between heat transfer and fluid-flow in rib-tube was studied in this paper. Based on theoretical analysis, the model and wall-function were chosen to simulate the flow field of rib-tube, and the multiphase flow was described by the mixture model, in which the dispersed phase was defined by different velocity. In addtion, self-defining functions were used and governing equations were set up to solve the dispersed phase, and the result were compared with the experiment. The process of fluid-flow and heat exchange on rib-tube was simulated, and the contours of temperature, pressure, velocity, gas fraction were obtained, which showed that, the parameters of above changed when the temperature was rising and the LNG evaporating along the rib-tube, and a mixed process existed in the middle of the heat tube.

scholarly journals Application of computer training systems for qualification perfection of technological personal of blast furnace shops

2019 ◽  
Vol 75 (4) ◽  
pp. 448-453
Author(s):  
S. V. Filatov ◽  
A. I. Dagman ◽  
S. V. Myasoedov ◽  
S. A. Zagainov ◽  
L. Yu. Gileva
Keyword(s):  
Blast Furnace ◽  
Thermal State ◽  
Computer Training ◽  
Transient Processes ◽  
Effective Control ◽  
State Control ◽  
Hot Metal ◽  
Size Change ◽  
Heat And Mass Exchange ◽  
Training Systems

Effective control of thermal state of a blast furnace (BF), considerably depending on the qualification of the technological personal, is an important condition for smelting of hot metal of required composition. Application of computer training systems (CTS) in the process of education of technological personal of BF shops is one of the effective methods of professional knowledge and skill perfection. The CTS, implemented at PAO NLMK, based on a model of thermal state of BF, elaborated in Ural Federal University and supplemented with the models of existing disturbances. Adjusting of dynamic characteristics accomplished on the base of regularity of heat- and mass exchange. According to the tasks of BF heat operative control, during the training at the CTS transient processes are studied through channels of BF thermal state control, skill is mastered to identify the tendencies of BF thermal state change in case of non-controlled disturbances action. Most important stage of the training – implementation of adequate solutions to compensate declination of BF thermal state parameters from the set-up level. The CTS implemented at PAO NLMK is operating in the mode of training and testing. The main parameters of BF operation for every particular scenario are displayed at a mnemonic diagram, which completely corresponds to the mnemonic diagram of particular BF. Within the frame of transient processes dynamics studies, tasks are stipulated to modify a BF thermal state by application of control programs. When a scenario of BF thermal state control in case of non-controlled disturbances action is realized, the process parameters change is imitated at the mnemonic diagram. It will be done in case of one of the following parameters change: coke quality change, reducibility change, iron ore material grain size change, distribution of ore by radius change. The CTS includes a module of administration, which allows collecting the statistics of tasks fulfilment by pupils and estimating the results according to accepted algorithm. The application of CTS enabled to perfect the competence of technological personal, which was expressed by declining of off-grade hot metal share.

Intensity Analysis on Heat Transfer of the Jet Plug-in Hot Blast Furnace

2011 ◽  
Vol 396-398 ◽  
pp. 1856-1859
Author(s):  
Xue Ping Wang ◽  
Ying Zhang ◽  
Pan Li ◽  
Zhen Wei Zhang
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Strain Distribution ◽  
High Heat ◽  
Structure Design ◽  
Large Temperature ◽  
Stress And Strain ◽  
Element Analysis ◽  
Hot Blast ◽  
Stress And Strain Distribution

This paper primarily focuses on the analysis on temperature, stress and strain distribution of the heat transfer in the jet plug-in hot blast furnace aiming at obtaining the parts of the heat transfer with relatively high heat stress according to the stress and strain distribution. The authors took advantage of the method of the finite element analysis to study the temperature field. Through the analysis, the authors can figure out that thermal stress can not be found in the highest temperature part, but in the parts with large temperature difference, and meanwhile this thesis puts forward the reasons causing these situations. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

scholarly journals Reduction of Silicon in Hot Metal by Iron Ore and Flux Injection through Blast Furnace Tuyere

1991 ◽  
Vol 77 (10) ◽  
pp. 1625-1632 ◽  
Author(s):  
Kanji TAKEDA ◽  
Yoshitaka SAWA ◽  
Seiji TAGUCHI ◽  
Nobuhiro TAKASHIMA ◽  
Toshiyuki MATSUMOTO ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Hot Metal ◽  
Blast Furnace Tuyere
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