Effect of binder amount on the development of coal-binder interface and its relationship with the strength of the carbonized coal-binder composite

Sharma, Atul; Sakimoto, Naoto; Takanohashi, Toshimasa

doi:10.1016/j.crcon.2018.05.002

Cited by 11 publications

(25 citation statements)

References 15 publications

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“…The metaplast binds the un‐softened coal particles and resolidifies to form coke with the increase of temperature. Coke matrix originated by softening and resolidification of coking coal (Figure A) presents a structure dominated by coarse vacuoles; it can be obviously observed that the coke matrix and the SF coal particles are well connected from the contact interface. The SEM of C2 is slightly different from C1 from Figure .…”

Section: Resultsmentioning

confidence: 99%

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Significantly enhances caking index of long‐flame coal under tetralin‐glycerol/H₂ system

Liu

Wang

Yang

et al. 2019

Asia-Pacific J Chem Eng

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For alleviating of the shortage of coking coal resource and efficient cleaning and utilization of low-rank coal, hydro-plasticization of low-rank coal was carried out. However, the caking property of low-rank coal cannot be obviously improved under mild conditions in the traditional tetralin-H 2 system. This study is to investigate the feasibility of mixed tetralin-glycerol as a solvent in the process of low-rank coal hydro-plasticization. The solvent ratios of tetralin-glycerol, reaction pressure, and atmosphere were varied to evaluate their effects on hydro-plasticization. The results show that the caking index (G RI ) of long-flame coal increases from 0 to 78 at mild conditions, and the hydrogen transfer mechanism might be directly from H 2 to coal rather than through hydrogen-donor solvents in the mixed solvent case. The solvent extraction and the G RI of modified coals were measured and found that the G RI of modified coal has a good linear relationship with PAA yield, and its R 2 is .985.

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Section: Resultsmentioning

confidence: 99%

“…It can be found that there are many pores in the coke matrix of C2 compared with that carbon matrix of C1. This is due to volatile or gases that are released during carbonization, and this may be reason for the low compressive strength of C2 …”

Section: Resultsmentioning

confidence: 99%

Significantly enhances caking index of long‐flame coal under tetralin‐glycerol/H₂ system

Liu

Wang

Yang

et al. 2019

Asia-Pacific J Chem Eng

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“…There have been renewed interest in using oil/coal derived additives as binders to produce cokes from low rank non-coking coals. [3][4][5] However, the coke strength required for the commercial use in a blast furnace has not been achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Another approach is to chemical upgrade the coal by increasing its H/C ratio by solvent treatment. [3][4][5][6][7][8][9][10][11][20][21][22][23][24][25] Takanohashi et al treated different coals with 1-MN and obtained 1-MN soluble fractions. 7,32) This 1-MN soluble coal fraction was called coal-derived binder.…”

Section: Introductionmentioning

confidence: 99%

“…They reported that adding 5-10% of binder increases the strength of the cokes. 3,5,[6][7][8][9]27,29,31) They investigated the interactions between caking and slightly caking or non-caking coals using NMR analysis and H/C ratio and concluded that the binders (HPC) enhance the thermo-plasticity of the coal blend due to their high thermo-plasticity and overlapping thermoplastic temperature range with that of coals. 3,[19][20][21][23][24][25][26][27] Sakimoto et al introduced carbon matrix connectivity index to estimate the coke drum index which directly correlates with the coke strength.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Carbonization Heating Rate on the Tensile Strength of Cokes Prepared from Chemically Upgraded Low Rank Coals

et al. 2019

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In this study, effect of carbonization heating rate and solvent removal method on the tensile strength of cokes prepared from chemical upgraded coal samples was investigated. A low rank coal, L coal, was solvent treated at 420°C, 2 h with 1-methylnapthlene (1-MN) solvent. Upgraded coal samples were obtained by removing 1-MN from the solvent treated samples. Two different approaches were applied to remove 1-MN from the treated samples; washing with tetrahydrofuran (THF) and that with n-hexane (HEX). All upgraded samples were first pelletized under a mechanical pressure and time of 40 MPa and 10 min, respectively, and then carbonized at heating rate of 3, 10 or 25°C/min. Carbonized coke samples strength was measured as tensile strength (MPa). It was found that lower heating rate gave higher tensile strength irrespective of solvent removal method. This may be due to that lower heating rates allowed the coal upon heating to undergo softening, melting and re-solidification for longer time. n-HEX-washed upgraded samples showed higher strength than THF-washed ones when the same heating rates were applied. Surfaces of coke samples were observed by scanning electron microscopy (SEM) and it was found that pore development structures of cokes n-HEX-washed samples and those from THF-washed samples were different from each other. This difference may be responsible for that in the strength.

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Enhanced mechanical and tribological properties of epoxy‐based coatings by in‐situ synthesized silicon dioxide nanoparticles

Liao

Cao

et al. 2022

J of Applied Polymer Sci

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Friction and wear behaviors severely inhibit the regular operation and lifetime of mechanical components served in the ocean extreme environment. Herein, we report a novel in-situ synthesis strategy for fabricating silicon dioxide nanoparticles-reinforced epoxy (EP)-based composite coatings. The crystalline phases, sizes, morphologies, and reaction mechanism of the in-situ-synthesized nanoparticles were characterized, and the mechanical and tribological properties of the EP-silicon dioxide based composite coatings were also investigated in detail. The results showed that the in-situ-synthesized nanoparticles with a size about 100-150 nm were in an amorphous state and were covalently grafted onto the epoxy resin matrix. The thermal stability, nano-hardness and scratch-resistance of the composite coatings have been significantly improved. Moreover, the appropriate nanoparticles greatly reduced the wear rates of the epoxy composite coatings, which decreased by two orders of magnitude than that of pure EP coating when their incorporation content reaches 20 wt%.Additionally, the wear rate of the 15 wt% composite coating under the seawater medium decreased by 79.5 compared to that of pure coating.

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Effect of binder amount on the development of coal-binder interface and its relationship with the strength of the carbonized coal-binder composite

Cited by 11 publications

References 15 publications

Significantly enhances caking index of long‐flame coal under tetralin‐glycerol/H₂ system

Significantly enhances caking index of long‐flame coal under tetralin‐glycerol/H₂ system

Effect of Carbonization Heating Rate on the Tensile Strength of Cokes Prepared from Chemically Upgraded Low Rank Coals

Enhanced mechanical and tribological properties of epoxy‐based coatings by in‐situ synthesized silicon dioxide nanoparticles

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Effect of binder amount on the development of coal-binder interface and its relationship with the strength of the carbonized coal-binder composite

Cited by 11 publications

References 15 publications

Significantly enhances caking index of long‐flame coal under tetralin‐glycerol/H2 system

Significantly enhances caking index of long‐flame coal under tetralin‐glycerol/H2 system

Effect of Carbonization Heating Rate on the Tensile Strength of Cokes Prepared from Chemically Upgraded Low Rank Coals

Enhanced mechanical and tribological properties of epoxy‐based coatings by in‐situ synthesized silicon dioxide nanoparticles

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Significantly enhances caking index of long‐flame coal under tetralin‐glycerol/H₂ system

Significantly enhances caking index of long‐flame coal under tetralin‐glycerol/H₂ system