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

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 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.

scholarly journals Effect of Lignite Addition on Gasification Properties and Coke Strength after Reaction

2018 ◽  
Vol 58 (7) ◽  
pp. 1218-1223 ◽  
Author(s):  
Tengfei Song ◽  
Jianliang Zhang ◽  
Guangwei Wang ◽  
Haiyang Wang ◽  
Runsheng Xu
Keyword(s):  
Coke Strength ◽  
Coke Strength After Reaction

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
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