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.

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.

Research on the Temperature Field and Roast Mechanism of Blast Furnace Tap-Hole Clay

2011 ◽  
Vol 189-193 ◽  
pp. 1370-1375
Author(s):  
Shi Ling Yang ◽  
Jian Hua Zhang ◽  
Ying Dong ◽  
Xue Jie Cao
Keyword(s):  
Temperature Field ◽  
Blast Furnace ◽  
High Temperature ◽  
Crystalline Phase ◽  
Air Permeability ◽  
High Temperature Strength ◽  
Coke Structure ◽  
Mullite Phase ◽  
Different Temperatures ◽  
Abaqus Software

The temperature field of blast furnace tap hole clay was analyzed by using ABAQUS software. Samples taken from the tap-hole clay in depth of 1200mm, 2200mm, 2600mm and 2800mm after roasted for 100 minutes were studied by using XRD and SEM to investigate their roast mechanism and microstructure at different temperatures. The results show that the ore phase of the tap-hole clay in depth of 1200mm remained unchanged but only tar and asphalt appear the carbonation phenomena. There is a large number of SiC crystalline phase appears in depth of 2200mm. At the same time, porosity increases and coke structure is formed. The air permeability is enhanced. In the tap-hole clay of 2600mm～2800mm depth, elongated rod-likeβ-Si3N4 grains obviously increase while the SiC grains decrease. A large number of high-temperature flocculent mullite phase appears and the high-temperature strength of the tap-hole clay is strengthened.

scholarly journals Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

ACS Omega ◽  
2022 ◽  
Author(s):  
Deepak Kumar ◽  
Vinod Kumar Saxena ◽  
Hari Prakash Tiwari ◽  
Barun Kumar Nandi ◽  
Abhilash Verma ◽  
...  
Keyword(s):  
Experimental Study ◽  
Reactivity Index ◽  
Metallurgical Coke ◽  
Coke Strength ◽  
Coke Reactivity ◽  
Coke Strength After Reaction

scholarly journals Protective mechanism of unburned pulverized coal to coke in blast furnace

2019 ◽  
Vol 55 (3) ◽  
pp. 371-380
Author(s):  
D.-W. Xiang ◽  
F.-M. Shen ◽  
X. Jiang ◽  
J.-L. Yang ◽  
X.-J. Li ◽  
...  
Keyword(s):  
Pulverized Coal ◽  
Apparent Porosity ◽  
Internal Erosion ◽  
Protective Mechanism ◽  
Coke Strength ◽  
Coke Reactivity ◽  
Internal Morphology ◽  
Coke Strength After Reaction ◽  
Interfacial Chemical Reaction

The edge and internal morphology of coke with different contents of UPC (unburned pulverized coal) after reaction with CO2 were analyzed by SEM. The influence of UPC on CRI (coke reactivity)?CSR (coke strength after reaction) and apparent porosity was also studied. The synthetic weighted mark method was used to analyze the comprehensive effect of UPC content on coke quality. The results show that because of the decrease of the content of intermediates Cf(O) and C(O)Cf(O) the restrictive step between the coke and CO2 is an interfacial chemical reaction, and it accords with the Mckewan equation 1-(1-?)1/3=kt. The UPC has a strong effect on coke when the content of UPC is 10~20%; meanwhile , the CRI and the apparent porosity are significantly decreased by 6.8% and 9.5%, respectively, and the CSR is significantly increased by 3.8%. The UPC can effectively reduce the effect of CO2 on the edge and the internal erosion of coke; the large pores and the pulverization of coke were avoided. The results of the synthetic weighted mark method showed that the comprehensive quality of coke changed greatly when the content of unburned pulverized coal was 11.24~20.87%, which is in agreement with the experimental results.

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.

scholarly journals Production and quality of blast furnace coke in Ukraine

2007 ◽  
Vol 1 (2) ◽  
pp. 91-96
Author(s):  
Yevgen Kovalov ◽  
Keyword(s):  
Coke Quality ◽  
Coke Production ◽  
Raw Material ◽  
Metallurgical Coke ◽  
Material Base ◽  
Preparation Methods ◽  
Blast Furnace Coke ◽  
Coal Charge ◽  
Furnace Coke

This research displays the state of metallurgical coke production in Ukrainew with special attention to the raw material base for production of coke and its quality. Besides the following essay deals with the detailed analysis of preparation methods of coal charge for coking, including thermal treatment and stamp charging and formulates the main ways of upgrading coke quality considering the rational technology of coking.

Ensuring stable quality of blast-furnace coke

2012 ◽  
Vol 55 (8) ◽  
pp. 304-308 ◽  
Author(s):  
V. P. Lyalyuk ◽  
V. P. Sokolova ◽  
I. A. Lyakhova ◽  
D. A. Kassim
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Coke ◽  
Furnace Coke

Assessing the quality of blast-furnace coke

2011 ◽  
Vol 41 (7) ◽  
pp. 589-592 ◽  
Author(s):  
A. K. Tarakanov ◽  
V. P. Lyalyuk ◽  
D. A. Kassim
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Coke ◽  
Furnace Coke
Sign in / Sign up

Export Citation Format

Share Document