Features of thermal conditions and control of thermal processes in blast furnace hot blast stoves with poured checkerwork

Refractories ◽  
1990 ◽  
Vol 31 (11-12) ◽  
pp. 644-652
Author(s):  
L. N. Toritsyn
Keyword(s):  
Blast Furnace ◽  
Thermal Conditions ◽  
Thermal Processes ◽  
Hot Blast ◽  
And Control

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

scholarly journals Optimization and control of working parameters of hot blast furnace

2018 ◽  
Vol 175 ◽  
pp. 02030
Author(s):  
Heng Wang ◽  
Shukun Cao ※ ◽  
Quancheng Dong ◽  
Yi Cui ◽  
Zijian Cao ◽  
...  
Keyword(s):  
Blast Furnace ◽  
High Efficiency ◽  
Air Flow ◽  
Combustion Efficiency ◽  
Blast Stove ◽  
Optimization And Control ◽  
Working Principle ◽  
Hot Blast ◽  
Working Parameters ◽  
And Control

In order to improve the working efficiency of hot blast stoves, reduce environmental pollution, reduce labor intensity and improve combustion efficiency, this paper uses ANSYS software to simulate the temperature field and flow field of the hot blast stove, and uses the PID controller to realize the automatic control of the hot blast stove. The model and working principle of the hot blast stove are briefly introduced. The operating parameters (blowing fan air flow, coal intake) of the hot blast stove are briefly studied. The results show that the amount of air flow of the blast furnace depends on the coal intake of the hot blast stove, which is generally per kilogram of coal. 8m3-10m3- air is required. When the coal intake is 120kg/h and the air volume of the blower is 1200m3/h, the hot blast stove can work stably with high efficiency. The results obtained are input into the database for later combustion. The work provides a theoretical basis.

Research and Modelling on Electrical and Thermal Mode of LEDs Operation in the Luminaire

2018 ◽  
pp. 155-162 ◽  
Author(s):  
Sergei S. Kapitonov ◽  
Anastasia V. Kapitonova ◽  
Sergei Yu. Grigorovich ◽  
Sergei A. Medvedev ◽  
Taher Sobhy
Keyword(s):  
Thermal Conditions ◽  
Operating Mode ◽  
Thermal Processes ◽  
Thermal Mode ◽  
Crystal Temperature ◽  
Premature Failure ◽  
Model Based

In the article, the electrical and thermal processes in the LED lamp with varied parameters are investigated. Voltage and current measurements on all LEDs of the luminaire are carried out in the nominal operating mode. The power allocated to each LED is determined. The calculation of the LED crystal temperature was carried out using the developed thermal LED model based on the results of the measurements and by using “Multisim” program. It has been established that the temperature of the crystals of individual LEDs in the luminaire differ significantly, which leads to unfavourable thermal conditions for them and an increased likelihood of premature failure.

A Comprehensive Review on Blast Furnace

2018 ◽  
Vol 4 (11) ◽  
pp. 6
Author(s):  
Upendra Kumar ◽  
Avinash Patidar ◽  
Bhupendra Koshti
Keyword(s):  
Blast Furnace ◽  
Metallurgical Coke ◽  
Waste Plastics ◽  
Blast Furnaces ◽  
Liquid Hydrocarbons ◽  
Comprehensive Review ◽  
Global Performance ◽  
Flow Heat ◽  
And Control ◽  
Recycled Waste

The design and control of blast furnace (BF) ironmaking must be optimized in order to be competitive and sustainable, particularly under the more and more demanding and tough economic and environmental conditions. To achieve this, it is necessary to understand the complex multiphase flow, heat and mass transfer, and global performance of a BF. In this paper injection of alternative reducing agents via lances in the tubers of blast furnaces is discussed to reduce the consumption of metallurgical coke. Besides liquid hydrocarbons and pulverized coal the injection of recycled waste plastics is possible, offering the opportunity to chemically reuse waste material and also utilize the energy contained in such remnants.

scholarly journals Two innovative modelling approaches in order to forecast consumption of blast furnace gas by hot blast stoves

2019 ◽  
Vol 158 ◽  
pp. 4043-4048 ◽  
Author(s):  
Ismael Matino ◽  
Stefano Dettori ◽  
Valentina Colla ◽  
Valentine Weber ◽  
Sahar Salame
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Gas ◽  
Hot Blast ◽  
Modelling Approaches

Research and Application of the New Technologies on Blast Furnace at Shougang Qiangang Plant

2011 ◽  
Vol 402 ◽  
pp. 151-155 ◽  
Author(s):  
Fu Ming Zhang
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
High Efficiency ◽  
New Technologies ◽  
Technical Equipment ◽  
Gas Temperature ◽  
Bag Filter ◽  
Large Blast ◽  
Blast Stove ◽  
Hot Blast

In recent years great progress is made in technical equipment of large blast furnace in China. A series of new process, technologies and equipment, integrated and developed on our own, are applied on newly built large blast furnaces and have been proved to be highly effective. After more than 20 years’ development and innovation of the bell-less top equipment designed and developed on our own, it has reached the advanced level in the world in terms of equipment reliability and service life; fully-dry impulse bag filter dedusting technology of BF gas, which is also developed on our own, has gained technical breakthroughs in terms of optimized system design, gas temperature control, pneumatic conveying of dedusting fines; the integrated innovative high-efficiency long-life high-temperature technology, through applying high-temperature preheating technology of combustion air, improving heat transfer efficiency of hot blast stove and optimizing structure of the hot blast stove system, enables the blast temperature to reach 1250°C with BF gas as fuel.

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