scholarly journals Coke Strength after CO2 Reaction for Coke Used Blast Furnace

1982 ◽  
Vol 61 (12) ◽  
pp. 1066-1073 ◽  
Author(s):  
Tetsu NISHI ◽  
Hiroshi HARAGUCHI ◽  
Keigi NISHIMOTO
Keyword(s):  
Blast Furnace ◽  
Coke Strength

Neural Network Modeling of Coefficient of Burden Resistance to the Gas Movement in the Lower Part of the Blast Furnace in Conditions of Operation with Coke Nut

2016 ◽  
Vol 870 ◽  
pp. 487-491
Author(s):  
Salavat K. Sibagatullin ◽  
Aleksandr S. Kharchenko ◽  
Marina V. Potapova
Keyword(s):  
Blast Furnace ◽  
Natural Gas ◽  
Oxygen Content ◽  
Resistance Coefficient ◽  
Reactivity Index ◽  
Neural Network Modeling ◽  
Coke Strength ◽  
Water Steam ◽  
Gas Consumption ◽  
Natural Gas Consumption

A mathematical model based on the use of artificial neural networks for forecast of resistance coefficient of burden to the gas at the bottom of the blast furnace with using of coke nut by processing of data array for the OJSC "MMK" blast furnaces (capacity of 1370 m3), equipped with a chute-type bell-less charging device has been created. This test has shown the adequacy of the model to real data. Influence of such factors as characteristics of blast (oxygen content, temperature, natural gas and water steam consumption), iron ore (raw material consumption per time unit, FeO, MgO, Al2O3 content, fraction, basicity), coke (wearability (M10), impact strength (M25), coke strength reactivity (CSR), coke reactivity index (CRI)) on gas dynamics variation at the lower part of the black furnace have been determined. Average relative prediction error does not exceed 0.28 %, the maximum of the sample is 2.82 %. The oxygen content in the blast has the biggest effect on the burden resistance coefficient. When oxygen concentration is more than 25.2 %, the increase of natural gas consumption improves gas-dynamic conditions in the lower part of blast furnace. With the decrease of oxygen content in the blast, the influence of natural gas consumption on coefficient of burden resistance varies in the opposite direction. The reduction of coke wearability (M10) by 0.05 % abs. or the increase of coke strength reactivity (CSR) by 0.14 % abs. has compensated negative effect of coke nut (consumption 4 kg/t of iron) on blast furnace operation.

Effect of coke strength on blast furnace performance

Metallurgist ◽  
1985 ◽  
Vol 29 (1) ◽  
pp. 3-6
Author(s):  
V. N. Belyakov ◽  
V. N. Vakulin ◽  
G. L. Tsymbal ◽  
V. V. Emushintsev ◽  
�. �. Minikes
Keyword(s):  
Blast Furnace ◽  
Coke Strength ◽  
Furnace Performance ◽  
Blast Furnace Performance

Microstructural study of the effects of potassium vapour on carbonised materials

1990 ◽  
Vol 48 (4) ◽  
pp. 1082-1083
Author(s):  
L.S. Garrick ◽  
J.R. Fryer ◽  
T. Baird
Keyword(s):  
Blast Furnace ◽  
Metallurgical Coke ◽  
Major Influence ◽  
Gas Distribution ◽  
Coke Strength ◽  
Microstructural Changes ◽  
Microstructural Study ◽  
The Matrix ◽  
Molten Materials ◽  
Reducing Gases

Metallurgical coke in the blast furnace provides a permeable matrix through which reducing gases may ascend and molten materials descend. A lack of permeability will inevitably lead to a poor gas distribution and result in a reduction of the furnace output and efficiency.A decrease in the permeability of the carbonaceous coke matrix arises when changes induced by the blast furnace environment occur in the properties of the material and effect the matrix voidage by causing a reduction of coke strength. A major influence of change within the blast furnace is the presence of recirculating alkali, particularly potassium, which is known to induce considerable microstructural changes (enhanced localised ordering), within the metallurgical coke. These microstructural changes lead to structural weakening as a consequence of a variety of factors:-

scholarly journals Lignin from Bioethanol Production as a Part of a Raw Material Blend of a Metallurgical Coke

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1533 ◽  
Author(s):  
Koskela ◽  
Suopajärvi ◽  
Mattila ◽  
Uusitalo ◽  
Fabritius
Keyword(s):  
Image Analysis ◽  
Blast Furnace ◽  
Raw Materials ◽  
Graphite Powder ◽  
Material Behavior ◽  
Raw Material ◽  
Metallurgical Coke ◽  
Uniform Structure ◽  
Coke Strength ◽  
Custom Made

Replacement of part of the coal in the coking blend with lignin would be an attractive solution to reduce greenhouse gas emissions from blast furnace (BF) iron making and for obtaining additional value for lignin utilization. In this research, both non-pyrolyzed and pyrolyzed lignin was used in a powdered form in a coking blend for replacing 5-, 10- and 15 m-% of coal in the raw material bulk. Graphite powder was used as a comparative replacement material for lignin with corresponding replacement ratios. Thermogravimetric analysis was performed for all the raw materials to obtaining valuable data about the raw material behavior in the coking process. In addition, chemical analysis was performed for dried lignin, pyrolyzed lignin and coal that were used in the experiments. Produced bio cokes were tested in a compression strength experiment, in reactivity tests in a simulating blast furnace shaft gas profile and temperature. Also, an image analysis of the porosity and pore shapes was performed with a custom made MatLab-based image analysis software. The tests revealed that the pyrolysis of lignin before the coking process has an increasing impact on the bio coke strength, while the reactivity of the bio-cokes did not significantly change. However, after certain level of lignin addition the effect of lignin pyrolysis before the coking lost its significance. According to results of this research, the structure of bio cokes changes significantly when replacement of coal with lignin in the raw material bulk is at a level of 10 m-% or more, causing less uniform structure thus leading to a less strong structure for bio cokes.

Influce Mechanism on Compressive Strength of Coke in Blast Furnace

2011 ◽  
Vol 402 ◽  
pp. 191-195
Author(s):  
Xing Juan Wang ◽  
Ran Liu ◽  
Hong Li ◽  
Li Guang Zhu ◽  
Jue Fang
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
High Temperature ◽  
Loss Rate ◽  
Testing Machine ◽  
Carbon Loss ◽  
Coke Strength ◽  
Distribution Rule ◽  
Carbon Losses ◽  
High Temperature Compressive Strength

Coke is the unique role of supporting material column in blast furnace high temperature region. Therefore the most important property is the high temperature compressive strength after reaction. This paper used decarburization electric furnace, electric mirrors, adjustable atmosphere high temperature compression testing machine and other equipments, study on the relationships between coke carbon loss rate and reactivity and size, the distribution rule between high temperature compressive strength and coke carbon loss rate. The study found that the carbon loss rate was affected by reactivity and size, in the same piece of coke, external rate of carbon loss higher than the internal loss, the surface carbon losses affect on coke strength is less, it make coke size decrease; carbon losses occur inside will not affect the size of coke, but it may affect the coke compressive strength seriously. The compressive strength can be divided into two parts: a constant and an amount proportional to carbon loss rate.

Effect of coke strength on blast-furnace performance indices

Metallurgist ◽  
1997 ◽  
Vol 41 (12) ◽  
pp. 394-394
Author(s):  
A. D. Dzhigota ◽  
N. M. Mozharenko ◽  
F. N. Moskalina ◽  
A. I. Vasyuchenko ◽  
I. A. Fedotov
Keyword(s):  
Blast Furnace ◽  
Performance Indices ◽  
Coke Strength ◽  
Furnace Performance ◽  
Blast Furnace Performance

Study on the Index of Metallurgical Coke Strength after Reaction

2012 ◽  
Vol 487 ◽  
pp. 20-23
Author(s):  
Xing Juan Wang ◽  
Ran Liu ◽  
Shuang Ying Wang ◽  
Li Guang Zhu ◽  
Jue Fang
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Comprehensive Evaluation ◽  
Testing Machine ◽  
Metallurgical Coke ◽  
High Temperature Strength ◽  
Coke Strength ◽  
Blast Furnace Coke ◽  
Coke Strength After Reaction

The blast furnace coke plays four roles as exothermic agent, reducer, carburizer and framework. The former three roles can be played by other fuels, but the role as framework still can’t be played by other fuels by now. In order to ensure its skeleton role, it must be sure that the coke has enough high-temperature strength. This research uses KSJ decarbonizing electric furnace, drum-I and high temperature compressive testing machine to furthest simulate the coke’s actual actions in the blast furnace. The research indicates that comparing with the reactivity and strength index after reaction of coke GB4000-1996, the blast furnace coke’s high temperature compressive strength under a certain temperature and a certain carbon loss rate can give a more comprehensive evaluation of the quality of coke.

Real-time indices focus on slag flowability and coke strength for blast furnace operation

2019 ◽  
Vol 116 (6) ◽  
pp. 625
Author(s):  
Jia-Shyan Shiau
Keyword(s):  
Blast Furnace ◽  
Real Time ◽  
Liquidus Temperature ◽  
Furnace Operation ◽  
Coke Strength ◽  
Operation Conditions ◽  
Time Operation ◽  
Real Time Operation ◽  
Coke Strength After Reaction ◽  
Model Equations

It was well known that abnormal burden quality has a significant impact on the blast furnace (BF) permeability resulting in bad slag flowability and HM tapping, and the coke fines inside BF become much finer to reduce HM production and BF life when the coke strength is weak. Therefore, it is necessary to develop the real-time operation indices of the slag flowability and coke strength after reaction (CSR) in a lower part of BF. BF slag flowability was determined with liquidus temperature and viscosity from measured semi-synthetic slags (SiO2-Al2O3-CaO-MgO-TiO2), and the effects of MgO content, Al2O3 content and CaO/SiO2 on slag flowability are investigated according to the model equations derived from above measured data by using multiple-regression method. A real-time index combined with viscosity and liquidus temperature has been also designed to indicate appropriate slag flowability. In addition, a coke sampler was used to collect the coke samples at tuyere level to analyze the strength of BF bosh coke at various HM productivities. CSR quantitative target and its online index were obtained from the data of sampling coke properties, BF operation conditions and BF permeability to provide real-time reference for coke and HM production.

scholarly journals PENGARUH KOMPOSISI CAMPURAN BATU BARA LOKAL DAN IMPOR TERHADAP KUALITAS KOKAS PT ABC

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Safril Kartika Wardana ◽  
Babay Bayquni ◽  
M. Guntur Perkasa ◽  
Zikri A. Wafi
Keyword(s):  
Blast Furnace ◽  
Coke Strength ◽  
Reaction Index ◽  
Coke Strength After Reaction

Kokas merupakan hasil karbonisasi batu bara tanpa kontak udara yang menyebabkan berkurangnya kandungan zat terbang pada batu bara sehingga nilai karbon tertambatnya menjadi meningkat. Kokas digunakan sebagai bahan bakar dan bahan pereduksi besi dalam proses pembuatan baja dalam teknologi blast furnace. Kokas yang digunakan harus memenuhi parameter kimia dan fisik yang dipersyaratkan karena memiliki peranan penting dalam meningkatkan produktifitas pembuatan baja. Parameter kimia yang dibutuhkan pada kokas yaitu nilai kadar air, kadar zat terbang, kadar abu, kadar karbon tertambat, sedangkan untuk pengujian kualitas kokas didasarkan pada dua indek degradasi yaitu CRI (coke reaction index) dan CSR (coke strength after reaction). Tidak semua batu bara lokal memiliki kualitas yang memenuhi parameter yang dipersyaratkan, seperti batu bara Adaro dan Marunda Graha Mineral (MGM) dari Kalimantan yang memiliki kualitas dibawah standar yang dipersyaratkan. Penelitian ini bertujuan untuk mendapatkan batu bara sesuai dengan standar yang dipersyaratkan PT ABC melalui pencampuran atau blending batu bara lokal dengan batu bara impor German Creek 8 (GC-8) dan Moranbah North (MN) yang memiliki kualitas yang lebih bagus. Proses karbonisasi dilakukan pada suhu 1000ºC selama 1 jam dalam suatu tungku. Variasi komposisi yang dilakukan sebanyak tiga variasi. Selanjutnya kokas hasil karbonisasi dilakukan pengujian. Dari beberapa parameter kualitas kokas yang dipersyaratkan oleh PT ABC didapat hasil kadar air ketiga variasi sampel masih memiliki kadar air yang dipersyaratkan yaitu dibawah 4%, Kadar zat terbang ketiga variasi sampel masih memenuhi nilai yang dipersyaratkan yaitu

scholarly journals Results of tuyere coke sampling with regard to application of appropriate coke strength after reaction (CSR) for a blast furnace

2017 ◽  
Vol 53 (2) ◽  
pp. 131-138 ◽  
Author(s):  
J-S. Shiau ◽  
Y-C. Ko ◽  
C-K. Ho ◽  
M-T. Hung
Keyword(s):  
Blast Furnace ◽  
Operating Conditions ◽  
Regression Equations ◽  
Hot Metal ◽  
Coke Strength ◽  
Operation Conditions ◽  
Coke Strength After Reaction ◽  
Lower Permeability ◽  
Coke Fines ◽  
The Difference

Raising pulverized coal injection (PCI) will decrease coke rate, but increase the residence time of coke and abrasion in the blast furnace (BF). Thus, insufficient coke strength will generate more coke fines in the lower BF and result in lower permeability and production of hot metal (HM). For understanding the behavior of coke at various HM productivities, a tuyere coke sampler was used to collect the coke samples for measuring the coke strength. Firstly, the difference of sampled coke under the conditions of various HM productivities was explored. Secondly, the BF operating conditions and causes of generating more coke fines was correlated by testing the coke reaction rate after reaction. Finally, according to the above analysis results, the relative regression equations had been obtained for sampling coke properties, BF operation conditions and BF permeability. Furthermore, the coke strength after reaction (CSR) quantitative target and its online system at various blast conditions were set to provide some reference for coke and HM production.

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