Influence of Heating Conditions on the Strength of Coke Produced from Slightly-Caking Coal Containing Chemically-Loaded Thermoplastic Components

Tsubouchi, Naoto; Naganuma, Ryo; Mochizuki, Yuji; Hayashizaki, Hideyuki; Shishido, Takahiro

doi:10.2355/isijinternational.isijint-2018-791

Cited by 4 publications

(13 citation statements)

References 25 publications

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“…Coal samples (GA, KP) of varying particle sizes ( < 250 μm and 0.5-1.0 mm) and HPC ( < 250 μm) provided from the Study Group of Technique Elements for New Cokemaking Process 8,9) were used. The C and O contents of the coals used were 74-88 and 5-19 mass%-daf, respectively.…”

Section: Specimensmentioning

confidence: 99%

“…The C and O contents of the coals used were 74-88 and 5-19 mass%-daf, respectively. 8,9) The composition of HPC was: 88% (mass%-daf) C, 4.9% H, 1.6% N, 0.7% S and 5.0% O. 8,9) For GA, the initial softening temperature (IST) was 410°C, and a maximum fluidity (MF) of 130 ddpm [2.1 log(ddpm)] was observed near 460°C, before resolidification at 490°C.…”

Section: Specimensmentioning

confidence: 99%

“…Carbonization was carried out in a SUS tube to produce coke. [8][9][10] After charging the tube with specimens of particle size 0.5-1.0 mm, the sample was carbonized for 30 min in a muffle furnace under N 2 gas flow at 1 000°C. For coke preparation in the tube, several different heating schedules (Cases 1-4) were considered.…”

Section: Carbonizationmentioning

confidence: 99%

“…In Cases 2-4, the sample first was heated at 20°C/min to 400, 500 and 600°C, respectively, and then was continued heating at 3°C/min to 1 000°C. 9) To prepare formed coke, coal of particle size < 250 μm was used, as well as our prepared specimens. After pelletizing specimens at 30 MPa, the samples was carbonized for 30 min at 900°C under heating patterns similar to the above.…”

Section: Carbonizationmentioning

confidence: 99%

“…In particular, we demonstrated that coke manufactured from a specially-prepared input material -in which HPC pyridine-soluble components are chemically-loaded into the pores produced by pyridine treatment of coal -is stronger than that produced from the unloaded input material. 8,9) We attributed this result to a synergistic interplay of two mechanisms: (a) pyridine-induced cleavage of noncovalent bonds between O-functional groups in coal, and (b) suppression of cross-linking reactions during carbonization and amplification of fluidity due to increased proximity between coal and thermoplastic components, resulting from the introduction of HPC-derived thermoplastic components into the pores produced by pyridine-induced swelling. 8,9) In addition, we showed that the extent of the improvement in strength is greater for formed coke.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Additive Amount and Heating Conditions on the Strength of Coke Prepared from Non-Caking Coal

et al. 2019

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In the present study, we prepare several types of specimens from non-caking coal-including specimens in which noncovalent bonds between O-functional groups in coal are cleaved by pyridine and HPC-derived thermoplastic components are introduced into the pores produced by swelling, as well as specimens consisting of physical blends with HPC-and examine the influence of heating conditions and types of caking agents on the production of high-strength coke using a SUS tube. We also investigate the influence of heating conditions and types of caking agents on the strength of coke from pelleted specimens and determine the optimal conditions for producing high-strength coke from non-caking coal. HPC with a wide range of thermoplastic properties is more effective as caking agents than additives containing only low-molecular-weight or high-molecular-weight components. In addition, the strength of the produced coke depends on the amount of the additive, and optimal values of the additive amount are present. It was found that the following heating schedule is effective for producing high-strength coke from noncaking coal with added caking agents: First, high-speed heating (20°C/min) to an intermediate temperature in the range 400-600°C, recognized as the thermoplastic temperature range for typical caking coal; then, low-speed heating (3°C/min) to the temperature range of 900-1 000°C. Moreover, we demonstrate that, by increasing the rate of heating in the thermoplastic temperature range, it is possible to reduce the amount of caking agent added.

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Section: Specimensmentioning

confidence: 99%

Section: Specimensmentioning

confidence: 99%

Section: Carbonizationmentioning

confidence: 99%

Section: Carbonizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Additive Amount and Heating Conditions on the Strength of Coke Prepared from Non-Caking Coal

et al. 2019

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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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Strength and Gasification Reactivity of Coke Prepared by Blending a Ca/C Composite and Coal

et al. 2021

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In this study, a calcium/carbon composite (Ca/C) was prepared from porous CaO by the water vapor swelling method; its pores were filled with tar-derived carbonaceous material to produce high-strength and highly reactive coke. The properties of coke prepared by blending the Ca/C composite and caking-coal were then investigated. The mesopores in the swelling Ca disappeared and the crushing strength was developed by filling tar-derived carbonaceous material into the porous Ca. Thus, a Ca/C composite could be produced by the abovementioned method, wherein the tar-derived carbonaceous material and Ca species were in close proximity. When the Ca/C composite was blended into the caking-coal, the strength of the coke obtained increased by up to 50% of Ca/C blending, which made it possible to produce highstrength coke. On examining the C structure of the prepared coke by X-ray diffraction, that of the original coke was found to be almost unchanged by adding the Ca/C composite. Conversely, the Ca/C blendedcoke showed higher CO 2 gasification reactivity than the original coke prepared from caking-coal. Based on the CO 2 gasification reactivity test of the demineralized coke, it was clear that an increase in the gasification reactivity of the Ca/C blended-coke depended upon the catalytic effect of Ca. Thus, this method helped produce high-strength and highly reactive coke.

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Influence of Heating Conditions on the Strength of Coke Produced from Slightly-Caking Coal Containing Chemically-Loaded Thermoplastic Components

Cited by 4 publications

References 25 publications

Influence of Additive Amount and Heating Conditions on the Strength of Coke Prepared from Non-Caking Coal

Influence of Additive Amount and Heating Conditions on the Strength of Coke Prepared from Non-Caking Coal

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

Strength and Gasification Reactivity of Coke Prepared by Blending a Ca/C Composite and Coal

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