Catalysis mechanism of solution loss reaction of metallurgical coke in blast furnace: Experimental and modeling study

Fuel ◽  
2021 ◽  
Vol 290 ◽  
pp. 120025
Author(s):  
Zhao Lei ◽  
Jingchong Yan ◽  
Ruilun Xie ◽  
Zhe Yao ◽  
Chao Xue ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Metallurgical Coke ◽  
Catalysis Mechanism ◽  
Solution Loss Reaction ◽  
Modeling Study

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.

Production of SG Grade Pig Iron in Mini Blast Furnace

2013 ◽  
Vol 634-638 ◽  
pp. 3174-3180
Author(s):  
Madan Mohan Mahato ◽  
Mahesh Kumar Agrawal ◽  
Sharda Nand Sinha
Keyword(s):  
Blast Furnace ◽  
Metallurgical Coke ◽  
Chemical Compositions ◽  
Pig Iron ◽  
Hot Metal ◽  
Efficient Operation ◽  
Demand And Supply ◽  
Slag Chemistry ◽  
Capital Intensive

The entire life of a Blast furnace operator is spent to achieve the following aims: • To increase the productivity of Blast Furnace as high as possible. • To decrease the coke rate as low as possible to produce unit ton of hot metal. • To produce the hot metal of superior SG quality with particular reference to Sulphur & Silicon. • To keep the production cost as low as possible. The process indices of Mini Blast Furnace are similar to that of a conventional blast furnace. But, conventional blast furnace is capital intensive, solely dependent on good quality metallurgical coke, the gestation period is longer, and requires elaborate burden preparation. There is huge gap between demand and supply of steel in India. Also, India is dreaming to become developed nation by 2020. In such situations, the role of Mini Blast Furnace becomes very important. The slag chemistry is an important parameter to improve the process indices of MBF. The slag chemistry includes its chemical composition, liquidus temperature, fluidity, Sulphide capacity etc, which has an important bearing on the smooth & efficient operation of the MBF. The main important constituent of SG grade pig iron, particularly, Sulphur & silicon content should be 0.040% maximum and 1.20% to 2.20% maximum respectively. The chemical compositions of SG Grade Pig Iron is C- 3.80-4.20%, Mn – 0.35- 0.80%, Si – 1.20- 2.20%, S - 0.040% maximum and P – 0.15% maximum. The role of slag to produce such a low sulphur & low silicon in Mini Blast Furnace is very important. Therefore, to control Sulphur and silicon in SG Grade Pig Iron in Mini Blast Furnace, the optimisation of Slag Chemistry is an essential step.

Research on Metallurgical Reactivity Performance of Coke

2013 ◽  
Vol 395-396 ◽  
pp. 11-14
Author(s):  
Xin Yu Wang
Keyword(s):  
Blast Furnace ◽  
Reaction Temperature ◽  
Evaluation Indexes ◽  
Coke Reactivity ◽  
Different Temperatures ◽  
Solution Loss Reaction ◽  
Clear Statement ◽  
The Way

The coke reactivity is one of the major evaluation indexes of coke. But there is still no clear statement on the reaction temperature as well as the way of reaction. In order to have a further understanding on the process of coke solution loss reaction in the blast furnace, the present paper studied the coke reactivity at different temperatures and finally found out the reaction rules and constraints in different zones of the blast furnace.

Technological advancements in evaluating the performance of the pulverized coal injection through tuyeres in blast furnace

2020 ◽  
Vol 117 (6) ◽  
pp. 611
Author(s):  
Ashish Agrawal ◽  
Rohit Kumar Tiwari ◽  
Sanjiv Kumar ◽  
Rajeswar Chatterjee ◽  
Basant Kumar Singh ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Pulverized Coal ◽  
Injection System ◽  
Metallurgical Coke ◽  
Hot Metal ◽  
Metal Production ◽  
Replacement Ratio ◽  
Pulverized Coal Injection ◽  
Factors Influencing ◽  
Coal Injection

The pulverized coal injection (PCI) is pursued to reduce the hot metal production cost by replacing the expensive metallurgical coke with the non-coking coal. Increasing the PCI rate causes various difficulties in the blast furnace (BF) operation. In the present work, an attempt is made to review the various aspects of PC injection in BF such as the challenges with increasing the PCI rate and modifications in the injection system to circumvent the concerns related to higher PCI rate. Various methods for detecting the tuyere blockage and failure caused due to the high PCI rate are elaborated. The factors influencing the combustion of coal in front of tuyeres have been discussed and their impact in the replacement ratio has been discussed. Further, recommendations are made to improve the coal combustibility in front of tuyeres.

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.

Effect of carbon solution-loss reaction on properties of coke in blast furnace

2020 ◽  
Vol 27 (5) ◽  
pp. 489-499
Author(s):  
Qi-hang Liu ◽  
Shuang-ping Yang ◽  
Chen Wang ◽  
Yi-long Ji
Keyword(s):  
Blast Furnace ◽  
Solution Loss Reaction

Degradation behaviors of coke under complex solution loss conditions

2020 ◽  
Vol 118 (1) ◽  
pp. 101
Author(s):  
Jun Zhang ◽  
Dongsheng Yu ◽  
Rui Guo ◽  
Jiaxiong Lin
Keyword(s):  
Blast Furnace ◽  
Alkali Metal ◽  
Thickness Distribution ◽  
Pore Wall ◽  
Metal Enrichment ◽  
Thermogravimetric Analyzer ◽  
The Matrix ◽  
Degradation Behaviors ◽  
Gasification Reaction ◽  
Solution Loss Reaction

Solution loss reaction of coke provides reducing agent for ironmaking, which is an important chemical reaction in blast furnace. The coke itself is also degraded by the loss of carbon. In this paper, the degradation behavior of coke under complex conditions including alkali metal enrichment, simulated blast furnace temperature and atmosphere was studied. The pore size and pore wall thickness distribution of coke were measured by a microscope to characterize the structure of coke. The gasification reaction rate of coke matrix was measured by a thermogravimetric analyzer to characterize the matrix reactivity of coke. The results show that a coke has high CRI and low CSR, but it has high matrix reactivity and thick pore wall, which may lead higher strength after solution loss under alkali metal enrichment and simulated blast furnace atmosphere and heating conditions.

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