The Effects of Heat Loss of Blast Furnace on Its Coke Rate

2020 ◽  
Author(s):  
C. Caplick ◽  
L. Storm ◽  
M. Andrade ◽  
P. Pergi ◽  
W. Everitt ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Heat Loss ◽  
Coke Rate

Influence of the consumption of pellets with different basicity on indicators of blast-furnace smelting

2021 ◽  
pp. 4-10
Author(s):  
R. R. Dema ◽  
◽  
A. N. Shapovalov ◽  
S. N. Baskov ◽  
◽  
...  
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Pressure Drop ◽  
Optimal Level ◽  
Coke Rate ◽  
Specific Pressure ◽  
Blast Furnace Smelting ◽  
Gas Dynamic ◽  
Fluxed Pellets ◽  
Furnace Smelting

The results of the analysis of production data on the operation of blast furnace No. 1 (useful volume 1007 m3) of Ural Steel JSC for the period from 2013 to 2018 are presented. During this period, pellets from the Mikhailovsky GOK were used with varying degrees of fluxing: pellets of natural basicity in the ratio of CaO/SiO2 equal to 0.08 ± 0.02 units. (2013-2015) and partially fluxed pellets with a basicity of 0.52 ± 0.05 units. (from 2016 to the present). It has been established that the effectiveness of the use of pellets of various basicities is determined by their behavior in the blast furnace and depends on the proportion of pellets in the iron ore part of the charge. The gas-dynamic conditions of the smelting worsen with an increase in the proportion of pellets in the charge, which is accompanied by an increase in the specific pressure drop and forces the flow rate to be adjusted. There is an optimal level of specific pressure drop (53–55 Pa per 1 m3 of blast per minute) for the operating conditions of blast furnace No. 1 of Ural Steel, which ensures the optimum combination of the melting characteristics. Deviation from the optimal level of pressure drop leads to an increase in coke rate and a decrease in the degree of CO use, which is associated with gas distribution disturbance. Due to the increase in high-temperature properties, the replacement of non-fluxed pellets with off-fluxed pellets improves the gas-dynamic conditions in the lower part of the mine (in the cohesive zone). This leads to a decrease in the total pressure drop and specific pressure drop at a constant flow rate of the blast, and is a reserve for melting intensification. To minimize coke rate and maintain the high-performance operation of blast furnaces of Ural Steel JSC, it is necessary to work on 40–45 % of fluxed or 20–25 % acid pellets in a charge. An increase in pellet consumption while maintaining the efficiency of blast-furnace smelting is possible only if their high-temperature properties are improved. The improvement of these properties is possible as a result of optimizing the basicity and increasing the MgO content, which affects the structure and properties of the silicate bond. This work is carried out within a framework of the government order (No. FZRU-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation.

Stable and efficient blast furnace operation with high PCI and low coke rate at Arcelor Mittal Flat Carbon W-Europe

2007 ◽  
Vol 104 (5) ◽  
pp. 221-230 ◽  
Author(s):  
G. Dauwels ◽  
S. Clairay ◽  
E. Hess ◽  
J. Janz ◽  
J. -L. Eymond
Keyword(s):  
Blast Furnace ◽  
Furnace Operation ◽  
Coke Rate ◽  
Blast Furnace Operation

scholarly journals Study on the Appropriate Production Parameters of a Gas-injection Blast Furnace

2020 ◽  
Vol 39 (1) ◽  
pp. 10-25
Author(s):  
Liu Song ◽  
Liu Xiaojie ◽  
Lyu Qing ◽  
Zhang Xusheng ◽  
Qie Yana
Keyword(s):  
Blast Furnace ◽  
Combustion Temperature ◽  
Theoretical Calculations ◽  
Direct Reduction ◽  
Gas Injection ◽  
Oxygen Enrichment ◽  
Coke Rate ◽  
Theoretical Combustion Temperature ◽  
Enrichment Rate ◽  
Lower Heating

AbstractThe change regulations of the smelting parameters in a gas-injection blast furnace are investigated using theoretical calculations. The results show that when the volume of gas injected, the oxygen enrichment rate and the theoretical combustion temperature of tuyere are 600 m3/tHM, 10% and 1950~2200∘C, respectively, the conditions meet the smelting requirements of a blast furnace. With the increase of the oxygen enrichment rate, the required air volume decreases, the contents of CO and H2 in the top gas increase, and the content of CO2 first increases and then decreases.With an increase of the volume of gas injected, the coke rate decreases. In addition, when the oxygen enrichment rate and the volume of gas injected are 10% and 600 m3/tHM, respectively, the CO content of the top gas constantly increases with the increase of the coke rate, while the H2 and CO2 contents both decrease. With the increase of the H2 content in the gas, the direct reduction degree of iron gradually decreases and the volume shrinkage burden increases. Apparently, injecting gas into the blast furnace can prevent the theoretical combustion temperature from being too high and solve the contradiction between the upper cooling and lower heating of the blast furnace.

scholarly journals Energy Conservation and CO2 Abatement Potential of a Gas-injection Blast Furnace

2020 ◽  
Vol 39 (1) ◽  
pp. 96-106
Author(s):  
Yana Qie ◽  
Qing Lyu ◽  
Chenchen Lan ◽  
Shuhui Zhang
Keyword(s):  
Blast Furnace ◽  
Energy Conservation ◽  
Carbon Dioxide Emissions ◽  
Direct Reduction ◽  
Gas Injection ◽  
Total Carbon ◽  
Coke Rate ◽  
Carbon Consumption ◽  
Carbon Recycling ◽  
The Rich

AbstractThe gas-injection blast furnace (BF) is a new iron-making technology with an injecting gas instead of traditional pulverized coal injection (PCI) and recycling of the BF top gas through a gasifier. In contrast to traditional all-coke and PCI BFs, the coke rate will depend mostly on the heat consumption in a gas-injection BF with abundant injected gas, which results in a large coke-saving potential. Based on energy conservation, carbon recycling, CO2 abatement and fuel cost, the degree of direct reduction should be between 0.2 and 0.3. In addition, in terms of the effects of the gas injected and the rich oxygen rate in the tuyere region, the optimum injection parameters were obtained, which can reduce the coke rate to 273.36 kg/tHM, carbon recycling to 100.72 kg/tHM and abate carbon dioxide emissions by 94.00 Nm3/tHM. Theoretically, the minimum total carbon consumption value is 399.73 kg/tHM. These results illustrate the great potential for carbon recycling and coke saving in gas-injection BFs without increasing total carbon consumption.

scholarly journals Numerical investigation of the limit of coke rate reduction in an ironmaking blast furnace (BF)

2021 ◽  
Vol 2030 (1) ◽  
pp. 012081
Author(s):  
Zhaoyang Li ◽  
Yixiong Feng ◽  
Aimin Wang ◽  
Lechen Zhang
Keyword(s):  
Blast Furnace ◽  
Numerical Investigation ◽  
Coke Rate ◽  
Rate Reduction
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