The catalytic steam gasification of one Australian and three Japanese coals using potassium and sodium carbonates

Suzuki, Toshimitsu; Mishima, Masaru; Kitaguchi, Junji; Itoh, Mai; Watanabe, Yoshihisa

doi:10.1016/0378-3820(84)90011-0

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…It can be observed that the 5% addition run reaches full conversion in 6.3 h, whereas the 0, 1 and 3% additive runs are at a conversion of 80, 86 and 97%, respectively, after 11 h. The expected time for full conversion is calculated to be 14.1, 13.2, and 11.7 h for the 0, 1, and 3% catalyst loaded runs. It is clear from these results that the addition of catalyst decreased the reaction time needed for complete conversion, which is supported by literature for powdered coal research [13][14][15][16][17]. However, this is the first evidence reported of catalyzed pellet (large particle) conversion behavior.…”

Section: Char Reactivity Experimentssupporting

confidence: 81%

Reactivity study of fine discard coal agglomerates

Bunt

Neomagus

Botha

et al. 2015

Journal of Analytical and Applied Pyrolysis

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Section: Char Reactivity Experimentssupporting

confidence: 81%

Reactivity study of fine discard coal agglomerates

Bunt

Neomagus

Botha

et al. 2015

Journal of Analytical and Applied Pyrolysis

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“…This can be attributed to the extraction of some aliphatic and aromatics components from the coal samples during the liquefaction experiments, leaving a lower initial carbon-based mass for pyrolysis. According to Suzuki al ,. coal with ash yield values of 14.7–28 (wt %, adb) and fixed carbon content values in the range >70 wt % (adb) may be utilized for gasification.…”

Section: Resultsmentioning

confidence: 99%

“…According to Suzuki al. 44 , coal with ash yield values of 14.7−28 (wt %, adb) and fixed carbon content values in the range >70 wt % (adb) may be utilized for gasification. Researchers 45−47 reported that the ash yield in feed coals entering South African commercial gasifiers ranged between 22 and 30%.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa

Uwaoma¹,

Strydom²,

Matjie³

et al. 2019

Energy Fuels

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The lighter density (<1.5 g/cm3) fractions produced from two waste coals sampled from the waste coal disposal sites at thermochemical plants situated in South Africa were used as feed materials for liquefaction with tetralin. The liquefaction residues from the lighter density and untreated lighter density fractions were used in pyrolysis experiments. Pyrolysis of the lighter density fractions was carried out in a Fischer Assay oven at 750 and 920 °C under an argon atmosphere. Advanced analytical techniques (gas chromatography–mass spectrometry and nuclear magnetic resonance (NMR) spectroscopy) were employed to characterize the pyrolysis products. Also, the lighter density fractions, liquefaction residues, and their chars were examined using conventional and advanced analytical techniques. The pyrolysis char yields of the liquefaction residues ranged between 74% and 76%, and those of the coal float fractions ranged between 67.0 and 71.5%. Gas pyrolysis yields ranged between 16.0% and 20.0% for the residues and between 14.5% and 18.4% for the lighter density fractions, while the pyrolytic water and the tar products of the lighter density fractions were slightly higher than those of the liquefaction-derived residues. The proton NMR analysis of the tars from the residues shows marginally higher amounts of aromatic protons than those of the lighter density fractions. Chars which were generated after pyrolysis of the liquefaction-derived residues show higher porosity values than those from the pyrolysis of the lighter density fractions. The differences in the porosities are attributed to the opening of pores and extraction of some lower molecular mass aliphatic species from the coal matrix during liquefaction. The pyrolysis products distribution and characterization of the products showed that the residues (waste material) generated after tetralin liquefaction of the float fractions from the float–sink experiments of waste coals may be utilized for thermochemical processes (pyrolysis).

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“…Up until now, there have only been limited studies on steam‐CO 2 ‐carbon reaction models with DFM. A steam‐carbon combustion reaction is a slow reaction and needs the use of a catalyst like potassium hydroxide to enhance the reaction rate by increasing carbon gasification, promoting rapid adsorption of steam to the surface of carbon particles, and catalyzing the reaction of carbon and adsorbed steam to form CO . In addition to catalysts, Jin and colleagues have conducted systematic pioneering work in H 2 production by supercritical water gasification for low‐rank coal .…”

Section: Introductionmentioning

confidence: 99%

Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models

2018

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In integrated gasification combined cycles systems, it is of interest to estimate the burn or gasification rate ( _ m), particle surface/wall temperature (T w ), and flame temperature (T f ), and also control of the T w and T f with free stream CO 2 and the H 2 O level, which promote endothermic reactions. In the past, char combustion in the air was modelled using either a conventional single film model (SFM), or a conventional double film model (DFM). In this study, modified SFM and DFM models, including both heterogeneous reactions of CO 2 and H 2 O with C, and gas phase oxidation of both CO and H 2 , were developed. The SFM and DFM were switched to SFM-DR (single film model with double reactions) and DFM-DR (double film model with double reactions). The SFM-DR assumes that the gas phase is frozen, with the final products being CO and H 2 , and the transfer numbervH 2 O;IV ; DFM-DR includes gas phase oxidation of both CO and H 2 with O 2 , with the final products being CO 2 and H 2 O and the same modified transfer number B under infinitely fast chemistry. Finally, six different char combustion cases with or without H 2 O and CO 2 in the free stream were simulated to obtain the flame profile for modified SFM-DR and DFM-DR. It was found that reasonable flame profiles of char combustion were obtained for both SFD-DR and DFM-DR. Moreover, the O 2 -rich combustion could promote the endothermic Boudouard and steam-carbon reactions. Finally, the burning rate (kg/m 2 Á s) decreased with the increase of particle diameter for both SFM-DR and DFM-DR.

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The catalytic steam gasification of one Australian and three Japanese coals using potassium and sodium carbonates

Cited by 13 publications

References 9 publications

Reactivity study of fine discard coal agglomerates

Reactivity study of fine discard coal agglomerates

Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa

Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models

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The catalytic steam gasification of one Australian and three Japanese coals using potassium and sodium carbonates

Cited by 13 publications

References 9 publications

Reactivity study of fine discard coal agglomerates

Reactivity study of fine discard coal agglomerates

Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa

Combustion of pure carbon in the presence of H2O and CO2 using single and double film models

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Product

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Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models