Pore Structure and Integrity of a Bio-Coke under Simulated Blast Furnace Conditions

Xing, Xing

doi:10.1021/acs.energyfuels.9b00008

Cited by 13 publications

(9 citation statements)

References 41 publications

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“…The use of biomass particles in comparison with pellets also has a noticeable effect on the size composition of the resulting biocoke. The size of cokes >25 mm, which is used for BF purposes, decreases with an increase in the percentage of biomass pellets due to increased fracturing and porosity [ 68 ]. Consequently, the amount of biocoke with 25–10 mm and

10 mm for non-BF purposes increases.…”

Section: Resultsmentioning

confidence: 99%

Metallurgical Coke Production with Biomass Additives: Study of Biocoke Properties for Blast Furnace and Submerged Arc Furnace Purposes

et al. 2022

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Biocoke has the potential to reduce the fossil-based materials in metallurgical processes, along with mitigating anthropogenic CO2- and greenhouse gas (GHG) emissions. Reducing those emissions is possible by using bio-based carbon, which is CO2-neutral, as a partial replacement of fossil carbon. In this paper, the effect of adding 5, 10, 15, 30, and 45 wt.% biomass pellets on the reactivity, the physicomechanical, and electrical properties of biocoke was established to assess the possibility of using it as a fuel and reducing agent for a blast furnace (BF) or as a carbon source in a submerged arc furnace (SAF). Biocoke was obtained under laboratory conditions at final coking temperatures of 950 or 1100 °C. Research results indicate that for BF purposes, 5 wt.% biomass additives are the maximum as the reactivity increases and the strength after reaction with CO2 decreases. On the other hand, biocoke’s physicomechanical and electrical properties, obtained at a carbonization temperature of 950 °C, can be considered a promising option for the SAF.

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10 mm for non-BF purposes increases.…”

Section: Resultsmentioning

confidence: 99%

Metallurgical Coke Production with Biomass Additives: Study of Biocoke Properties for Blast Furnace and Submerged Arc Furnace Purposes

et al. 2022

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“…This increases the number of active carbon sites that can be attacked by CO 2 , which enhances the gasification. Flores et al [52] and Xing et al [53] reported that a higher surface area of bio-coal and a greater number of active sites enhance bio-coke gasification. The combination between active carbon sites and remaining catalytic elements in the bio-coal promotes the gasification of bio-coke due to the formation of intermediate complexes, as claimed by others [54][55][56].…”

Section: Influence Of Modified Bio-coal Addition On Coke Reactivitymentioning

confidence: 99%

Influence of Modified Bio-Coals on Carbonization and Bio-Coke Reactivity

El-Tawil

Björkman

Lundgren

et al. 2021

Metals

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Substitution of coal in coking coal blend with bio-coal is a potential way to reduce fossil CO2 emissions from iron and steelmaking. The current study aims to explore possible means to counteract negative influence from bio-coal in cokemaking. Washing and kaolin coating of bio-coals were conducted to remove or bind part of the compounds in the bio-coal ash that catalyzes the gasification of coke with CO2. To further explore how the increase in coke reactivity is related to more reactive carbon in bio-coal or catalytic oxides in bio-coal ash, ash was produced from a corresponding amount of bio-coal and added to the coking coal blend for carbonization. The reaction behavior of coals and bio-coals under carbonization conditions was studied in a thermogravimetric analyzer equipped with a mass spectrometer during carbonization. The impact of the bio-coal addition on the fluidity of the coking coal blend was studied in optical dilatometer tests for coking coal blends with and without the addition of bio-coal or bio-coal ash. The result shows that the washing of bio-coal will result in lower or even negative dilatation. The washing of bio-coals containing a higher amount of catalytic components will reduce the negative effect on bio-coke reactivity, especially with acetic acid washing when the start of gasification temperature is less lowered. The addition of bio-coal coated with 5% kaolin do not significantly lower the dilatation-relative reference coking coal blend. The reactivity of bio-cokes containing bio-coal coated with kaolin-containing potassium oxide was higher in comparison to bio-coke containing the original bio-coal. The addition of ash from 5% of torrefied bio-coals has a moderate effect on lowering the start of gasification temperature, which indicates that the reactive carbon originating from bio-coal has a larger impact.

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“…[7] Several different compositions of biomasses and biochar have been reported in literature. [8][9][10][11][12][13][14] This work compares the composition of the formed BF slag when fossil-based coke is replaced with bio-based coke and pulverized coal is replaced with charcoal. To conduct this comparison, compositions for each of the coke (metallurgical coke and biocoke where 3 wt% of coal blend is replaced with Swedish wood charcoal [15] ), pulverized coal, [16] and charcoal (produced from pine chips, [9] eucalyptus, [12] acacia, [13] red gum, [13] and wheat straw [13] ) were chosen from literature and ash compositions were scaled to 100% focusing on the four main components, as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Effect of Coal and Coke Ash on Blast Furnace Slag Properties: A Comparison Between Pulverized Coal, Charcoal, Fossil‐Based Coke, and Biocoke

Heikkilä

Iljana

Heikkinen

et al. 2021

steel research int.

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Blast furnace (BF) is the most used equipment for production of iron in the world. It is charged mainly with metallurgical coke and ferrous materials. When descending inside the BF, iron‐bearing materials start reducing and melting with other burden materials. This melting leads to the formation of so‐called primary slags from which the final slag is formed as materials descend inside the furnace. Each charge material has a unique effect on the total composition of the BF slag. Herein, the parts of the slag, which originate from ash of metallurgical coke and pulverized coal, and changes in the final slag compositions and properties are focused on. The global trend is to decrease the use of fossil‐based carbon by replacing it with bio‐based coal. Ash from coke and pulverized coal eventually dissolve in the final slag, affecting its properties. The purpose herein is to evaluate how BF slag composition changes when fossil‐based coke is replaced with biocoke and pulverized coal is replaced with charcoal. Based on mass balance calculations, these replacements have both increasing and decreasing effects on solidus and liquidus temperatures, viscosity, and CaO/SiO2 and MgO/Al2O3 ratios depending on the used replacement materials.

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Pore Structure and Integrity of a Bio-Coke under Simulated Blast Furnace Conditions

Cited by 13 publications

References 41 publications

Metallurgical Coke Production with Biomass Additives: Study of Biocoke Properties for Blast Furnace and Submerged Arc Furnace Purposes

Metallurgical Coke Production with Biomass Additives: Study of Biocoke Properties for Blast Furnace and Submerged Arc Furnace Purposes

Influence of Modified Bio-Coals on Carbonization and Bio-Coke Reactivity

Effect of Coal and Coke Ash on Blast Furnace Slag Properties: A Comparison Between Pulverized Coal, Charcoal, Fossil‐Based Coke, and Biocoke

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