Investigation of strength and reduction reactivity during heat treatment in simulated-experimental blast furnace of carbon-containing pellet prepared by vapor deposition of tar to cold-bonded pellet with large particle size

Mochizuki, Yuji; Tsubouchi, Naoto; Akiyama, Tomohiro

doi:10.1016/j.fuproc.2018.03.009

Cited by 14 publications

(3 citation statements)

References 14 publications

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“…In addition, the specific surface area of the prepared VD samples was <1 m 2 ·g −1 , irrespective of VD times. According to our previous study [35,40,41], it was found that deposition of gaseous-tar into porous materials first occurs in smaller pores (e.g. mesopores) and then larger pores (e.g.…”

Section: Resultsmentioning

confidence: 99%

Preparation of coke from biomass char modified by vapour deposition of tar generated during pyrolysis of woody biomass

Mochizuki

Tsubouchi

2022

Ironmaking & Steelmaking

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In this study, in order to use woody biomass for coke production, carbon/carbon composites are first prepared using the vapour deposition (VD) method, whereby gaseous-tars generated by the pyrolysis of pine sawdust is deposited onto the pyrolysed pine sawdust char by a vertical flow-type fixed-bed reactor with pyrolysis and VD zones. Then, coke properties and gasification reactivity of composite and composite/coal blends are investigated to clarify the binder effect of biomass tar on the properties of prepared coke. The carbon/carbon composites could be prepared with a high yield at a low VD temperature. High-strength and high-reactivity coke was produced from the composite. The properties of the coke produced from composite/caking coal blending showed that the optimum blending amount depends on the type of caking coal, but high-strength and high-gasification reactivity coke can be produced. Additionally, it was found that 3-15wt-%-biomass could be added as char for coke production.

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Section: Resultsmentioning

confidence: 99%

Preparation of coke from biomass char modified by vapour deposition of tar generated during pyrolysis of woody biomass

Mochizuki

Tsubouchi

2022

Ironmaking & Steelmaking

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“…The reaction behavior of CCB can be of fundamental importance because it is closely related to the changes of ore reduction and of coke gasification in the upper part of a BF. Most studies on CCB reaction behavior have been carried out under simulated BF in-furnace conditions [18][19][20]. However, the high-pressure environment in a BF was generally overlooked in these studies.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Reaction Behavior of Carbon Composite Briquette in Blast Furnace

Tang

Sun

2019

Metals

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The application of carbon composite briquette (CCB) is considered to be an efficient method for achieving low-energy and low-CO2-emission blast furnace (BF) operations. In this research, a combined experimental and numerical study was conducted on the CCB reaction behavior in BF. The CCB used in this study had a composition of 20.10 wt.% carbon, 29.70 wt.% magnetite, 39.70 wt.% wüstite, and 1.57 wt.% metallic iron. Using the prepared CCB samples, isotherm reduction tests under a simulated BF atmosphere (CO-CO2-N2) were conducted and a reaction model was developed. Subsequently, the reaction behavior of CCB along the mid-radial solid descending path in an actual BF of 2500 m3 was analyzed by numerical simulations based on the experimental findings and the previous results of comprehensive BF modeling. The results of the experiments showed that the CCB model predictions agreed well with the experimental measurements. With respect to the BF, the results of the numerical simulations indicated that, along the path, before the CCB temperature reached 1000 K, the CCB was reduced by CO in the BF gas; when its temperature was in the range from 1000 to 1130 K, it underwent self-reduction and contributed both CO and CO2 to the BF gas; when its temperature was above 1130 K, it only presented carbon gasification. Moreover, these results also revealed that the reduction of iron oxide and the gasification of carbon inside the CCB proceeded under an uneven mode. The uneven radial distribution of the local reduction fraction and local carbon conversion were evident in the self-reducing stage of the CCB.

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“…[2] The CO 2 emissions of the iron and steel industry are primarily associated with the blast furnace (BF) system. Although several low-carbon BF technologies have been explored to mitigate these emissions, such as replacing coal and coke with a hydrogen-rich medium, [3,4] carbon capture, utilization, and storage, [5,6] and using the carbon-iron composite burden, [7][8][9] the BF system remains a significant source of emissions in the industry. The maximum carbon emission reduction of these low-carbon BF technologies is only 24%.…”

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Sticking Behavior of Burdens During Reduction Process in Gas‐Based Shaft Furnaces

Zhao,

Tang,

Wang

et al. 2023

steel research int.

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Gas‐based shaft furnaces (SFs) have garnered considerable attention because of their low CO2 emissions. The sticking behavior of their burden material influences the smooth operation of SFs. In this study, the effects of the reduction degree, temperature, and atmosphere on the sticking behavior of pellets are studied thoroughly under typical reduction conditions. The results demonstrate that the pellets will stick with each other as the reduction degree increases, the main phase of pellets at the maximum sticking index (SI) is iron, and the interconnection between iron whiskers results in the bonding phenomenon of pellets. The pellets exhibit a low SI at a relatively low reduction temperature. As the reduction temperature increases, the pellets stick, which is caused by thermal expansion and the large number of iron whiskers. With an increase in the proportion of H2 in the reducing gas, the iron particles become smaller, and the contact area between the particles decreases, effectively reducing the SI of the pellets. In general, choosing a reasonable reduction temperature and increasing the proportion of H2 in the reducing gas are helpful in controlling pellet sticking.

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Investigation of strength and reduction reactivity during heat treatment in simulated-experimental blast furnace of carbon-containing pellet prepared by vapor deposition of tar to cold-bonded pellet with large particle size

Cited by 14 publications

References 14 publications

Preparation of coke from biomass char modified by vapour deposition of tar generated during pyrolysis of woody biomass

Preparation of coke from biomass char modified by vapour deposition of tar generated during pyrolysis of woody biomass

Experimental and Numerical Investigation of Reaction Behavior of Carbon Composite Briquette in Blast Furnace

Sticking Behavior of Burdens During Reduction Process in Gas‐Based Shaft Furnaces

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