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

Mochizuki, Yuji; Kubota, Yukihiro; Uebo, Kazuya; Tsubouchi, Naoto

doi:10.1016/j.fuel.2018.05.157

Cited by 10 publications

(4 citation statements)

References 43 publications

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“…In other words, we considered the possible occurrence of a solid–solid state (between ash and Cl adsorbed on the carbon surface) reaction. As discussed in refs and mentioned above, if the Cl species dissociated on the carbon surface are associated in the chlorination reaction, the release of ash progresses by the adsorption of Cl in the solid phase beforehand, even in an inert gas. Figure a shows the change in RC yields.…”

Section: Resultsmentioning

confidence: 95%

Production of Silicone Tetrachloride from Rice Husk by Chlorination and Performance of Mercury Adsorption from Aqueous Solution of the Chlorinated Residue

et al. 2020

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The production of silicone tetrachloride (SiCl 4 ) from rice husk char by chlorination was investigated, and the effect of the char preparation temperature on SiCl 4 volatilization and the coexisting element species in the char was examined. The behavior of chlorine (Cl) and the change in pore properties during char chlorination were analyzed, and the reaction mechanism was discussed. The performance of Hg ion removal of the chlorination residue was also investigated. At 1000 °C chlorination, the optimum rice husk pyrolysis temperature for attaining high ashrelease extent was 800 °C. Ash volatilization during char chlorination with heat treatment mainly occurred at >300 °C and reached a release extent of ∼75% by 1000 °C. Si and P volatilization started at >300 °C and reached 70−75% by 1000 °C. In contrast, Na and K the volatilization occurred at >700 °C, with a 50% volatilization extent by 1000 °C. Mg and Ca had a volatilization rate of <20% by 1000 °C. When the char was held at 1000 °C, the release extent of Si and P reached 75−80% by 10 min. Na and K volatilized almost completely by 10 min, and the release extent of Mg and Ca increased with increasing holding time and became 10−50% by 60 min. The Cl content in the residue obtained at each chlorination temperature increased from 300 to 700 °C and then decreased with increasing temperature. The majority of Cl taken up in the residue was an H 2 O insoluble form. The surface area and pore volume of the chlorinated residue tended to increase with increasing chlorination temperature, with the former increasing to 335 m 2 /g at 1000 °C and 10 min holding. The maximum mercury adsorption amount of the chlorinated residue obtained at 1000 °C, 10 min holding was 620 mg/g, indicating the mercury ion adsorption performance of the chlorinated residue.

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Section: Resultsmentioning

confidence: 95%

Production of Silicone Tetrachloride from Rice Husk by Chlorination and Performance of Mercury Adsorption from Aqueous Solution of the Chlorinated Residue

et al. 2020

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“…The reproducibility and analytical error were both within ±5%. We have previously reported on the details of this procedure [30,37].…”

Section: Methodsmentioning

confidence: 99%

“…Our research has found that the strength of pyrolysed lignite char or low-strength coke particles can be improved by filling and depositing carbonaceous materials derived from tar into the pores and surfaces of these samples [30,31]. Furthermore, it has been shown that coal fluidity and coke strength can be increased by filling pyridine-solubles derived from coal extract into the pores generated by the solvent swelling of slightly caking coal or non-caking coal [32–34].…”

Section: Introductionmentioning

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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“…The most studied method is harnessing non-coking coal to replace part of coking coals, but the caking property of coal blends will deteriorate in such a situation. To improve the caking property, on the one hand, various high bond-ability substances, such as pitches, coal tar pitches, coal extracts, and solvent-refined coals, have been used in the carbonization process of coal blending with low bond-ability [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. On the other hand, non-coking coal was pretreated by thermal treatments [ 8 ], hydrothermal treatments [ 9 , 10 ], and steam treatments [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Boron Carbide on Coking Behavior and Chemical Structure of High Volatile Coking Coal during Carbonization

Sun

Zhu

et al. 2021

Materials

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Modified cokes with improved resistance to CO2 reaction were produced from a high volatile coking coal (HVC) and different concentrations of boron carbide (B4C) in a laboratory scale coking furnace. This paper focuses on modification mechanism about the influence of B4C on coking behavior and chemical structure during HVC carbonization. The former was studied by using a thermo-gravimetric analyzer. For the latter, four semi-cokes prepared from carbonization tests for HVC with or without B4C at 450 °C and 750 °C, respectively, were analyzed by using Fourier transform infrared spectrum and high-resolution transmission electron microscopy technologies. It was found that B4C will retard extensive condensation and crosslinking reactions by reducing the amount of active oxygen obtained from thermally produced free radicals and increase secondary cracking reactions, resulting in increasing size of aromatic layer and anisotropic degree in coke structure, which eventually improves the coke quality.

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

Cited by 10 publications

References 43 publications

Production of Silicone Tetrachloride from Rice Husk by Chlorination and Performance of Mercury Adsorption from Aqueous Solution of the Chlorinated Residue

Production of Silicone Tetrachloride from Rice Husk by Chlorination and Performance of Mercury Adsorption from Aqueous Solution of the Chlorinated Residue

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

Effects of Boron Carbide on Coking Behavior and Chemical Structure of High Volatile Coking Coal during Carbonization

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