Preparation of Highly Reactive and High Strength Coke by the Addition of Ca-ion Exchanged Brown Coal

Orikasa, Hironori; Kyotani, Takashi; Anraku, Daisuke

doi:10.2355/tetsutohagane.96.272

Cited by 9 publications

(2 citation statements)

References 6 publications

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“…As the reaction goes on, the coke around the additive is consumed in large quantities, leading to coalescence of coke. A pore structure with additives at the center is formed [35]. The pore structure has little effect on the specific surface area of coke due to its large size; in the part of coke without additive distribution, the reaction is uniform because of no additive catalysis, and the surface of coke is evenly eroded by CO 2 to form micropores, which increases the specific surface area of coke [36].…”

Section: Relationship Between Coke Reactivity and Specific Surface Areamentioning

confidence: 99%

Indirect Drying and Coking Characteristics of Coking Coal with Soda Residue Additive

Zhang

2021

Energies

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To improve indirect drying efficiency, the effect of soda residue on the drying characteristics of coking coal were studied using a self-made indirect drying system. A tube furnace was used in the dry distillation of coal samples with soda residue, and the coke properties were analyzed. The results indicated that the soda residue has a significant influence on the increase in the heating rate of coal samples in the temperature distribution range of 90 to 110 °C. With the addition of 2%, 5%, and 10% soda residue, the drying rates increased by 11.5%, 25.3%, and 37.3%, respectively at 110 °C. The results of dry distillation show that addition of 2%, 5% and 10% soda residue decreases the carbon loss quantity by 4.67, 4.99, and 8.82 g, respectively. The mechanical strength of coke samples satisfies the industrial conditions when the soda residue ratio ranges from 2% to 5%. Soda residue can improve the active point of coke dissolution reaction and inhibit coke internal solution. Economically, coking coal samples mixed with soda residue have an obvious energy saving advantage in the drying process. Energy saving analysis found that it can reduce cost input by 20% than that of the normal drying method.

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Section: Relationship Between Coke Reactivity and Specific Surface Areamentioning

confidence: 99%

Indirect Drying and Coking Characteristics of Coking Coal with Soda Residue Additive

Zhang

2021

Energies

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“…On the other hand, Nomura et al demonstrated the advantage of high-reactivity coke over conventional cokes for the use in a blast furnace . The reactive coke decreased the thermal reserve zone temperature, improving blast furnace reaction efficiency. − In Japan, the CO 2 Ultimate Reduction in Steelmaking Process by Innovative Technology for Cool Earth 50 (COURSE50) national project necessitates development of a high-reactivity coke because of the operation of the blast furnace under an atmosphere rich in hydrogen, which inhibits the gasification of coke.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Properties of Lignite To Be Converted to High-Strength Coke by Hot Briquetting and Carbonization

Kudo¹,

Mori²,

Hayashi³

et al. 2017

Energy Fuels

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A sequence of hot briquetting and carbonization (HBC) is a promising technology for the production of coke with a high mechanical strength from lignite, but factors affecting the coke strength have not yet been fully understood. The HBC cokes prepared from 12 lignites in this study showed diverse tensile strength (e.g., from 0.2 to 31.2 MPa in the preparation at 200 °C and 112 MPa for hot briquetting and 1000 °C for carbonization), and the coke strengths could not be explained by differences in commonly used structural properties of the parent lignites, such as elemental composition and contents of volatile matter/fixed carbon and ash. In this study, two methods were proposed for correlating the coke strength with the lignite properties, which employed the chemical structure analyzed by solid-state 13C nuclear magnetic resonance or the volumetric shrinkage during carbonization. A stronger coke was obtained from lignite that contained more aliphatic carbons (less aromatic carbons) or shrank more considerably. These characteristics contributed to intensified compaction of lignite in the briquetting and suppression of the formation of large pores, which are a cause of coke fracture. Two empirical equations, predicting the coke strength from the parameters of lignite properties, were established to be criteria for selection of lignite as HBC coke feedstock, although further investigation with more experimental data would be necessary for the validation.

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Influence of tarry material deposition on low-strength cokes or pyrolyzed chars of low rank coals on the strength

Mochizuki

Kubota

Uebo

et al. 2018

Fuel

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Preparation of Highly Reactive and High Strength Coke by the Addition of Ca-ion Exchanged Brown Coal

Cited by 9 publications

References 6 publications

Indirect Drying and Coking Characteristics of Coking Coal with Soda Residue Additive

Indirect Drying and Coking Characteristics of Coking Coal with Soda Residue Additive

Characteristic Properties of Lignite To Be Converted to High-Strength Coke by Hot Briquetting and Carbonization

Influence of tarry material deposition on low-strength cokes or pyrolyzed chars of low rank coals on the strength

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