Pyrolysis and Gasification of Coals by Use of Rapid Heating Method (II)

健治, 橋本; 孝一, 三浦; 一広, 前; 道弘, 山下

doi:10.3775/jie.62.433

Cited by 5 publications

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“…Therefore, it is important to clarify the factors that affect the gas−solid reaction of the char to analyze the gasification process. Coal and its char have an abundance of submicropores, of which the surface areas have been thought to be predominant in the char reactivity. − The pore structures of a solid such as char, which varies sequentially over the course of the gas−solid reaction, should be expressed quantitatively. Several gas−solid reaction models taking into account pore structures 1,2 have already been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it can be applied to the analysis of coal gasification rates. ,− However, a number of research studies have used another method to calculate ψ. For example, Hashimoto et al, in coal pyrolysis and gasification experiments, calculated ψ by the minimum-square method with pore surface areas at carbon conversions of X > 0.15, assuming that the variation of the pore surface area during gasification was subjected to eq 1. Ochoa et al calculated ψ from conversion X at the maximum reaction rate.…”

Section: Introductionmentioning

confidence: 99%

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Modeling on Pore Variation of Coal Chars during CO₂Gasification Associated with Their Submicropores and Closed Pores

et al. 2005

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When predicting the variation of pore structure during CO2 gasification of coal chars using the random pore model (RPM), it is impossible to calculate exactly the ψ parameter from the pore characteristics, which were obtained by means of N2 adsorption, such as BET surface area (denoted as N2 pore characteristics), of the char prior to gasification. The values of ψ, which were calculated from the pore characteristics of chars at various carbon conversions, should be fundamentally constant, unaffected by the conversion of the char. However, this investigation exhibited a drastic decrease of ψ at the initial stage of the gasification reaction. This phenomenon is the result of a significant increase of N2 pore characteristics, of which the starting chars are extremely small. This increase might be explained by the widening of submicropores which are undetectable through the N2 adsorption method or by the reopening of closed pores inaccessible even to helium molecules, followed by the formation of new micropores exceeding the detection limit of N2. Consequently, this study introduced the volume of submicropores and closed pores into the ψ equation as correction terms. The value of ψ at the reaction starting point was close to that at the intermediate stage of reaction, indicating that the accuracy for ψ estimation was elevated and that the submicropores and closed pores should be taken into account when using RPM.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling on Pore Variation of Coal Chars during CO₂Gasification Associated with Their Submicropores and Closed Pores

et al. 2005

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Relation between the gasification rate of carbons supporting alkali metal salts and the amount of oxygen trapped by the metal

Hashimoto

Miura

et al. 1986

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Pyrolysis of a Victorian brown coal and gasification of nascent char in CO2 atmosphere in a wire-mesh reactor

Jamil

Hayashi

2004

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150

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Pyrolysis and Gasification of Coals by Use of Rapid Heating Method (II)

Cited by 5 publications

References 1 publication

Modeling on Pore Variation of Coal Chars during CO₂Gasification Associated with Their Submicropores and Closed Pores

Modeling on Pore Variation of Coal Chars during CO₂Gasification Associated with Their Submicropores and Closed Pores

Relation between the gasification rate of carbons supporting alkali metal salts and the amount of oxygen trapped by the metal

Pyrolysis of a Victorian brown coal and gasification of nascent char in CO2 atmosphere in a wire-mesh reactor

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Pyrolysis and Gasification of Coals by Use of Rapid Heating Method (II)

Cited by 5 publications

References 1 publication

Modeling on Pore Variation of Coal Chars during CO2Gasification Associated with Their Submicropores and Closed Pores

Modeling on Pore Variation of Coal Chars during CO2Gasification Associated with Their Submicropores and Closed Pores

Relation between the gasification rate of carbons supporting alkali metal salts and the amount of oxygen trapped by the metal

Pyrolysis of a Victorian brown coal and gasification of nascent char in CO2 atmosphere in a wire-mesh reactor

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Modeling on Pore Variation of Coal Chars during CO₂Gasification Associated with Their Submicropores and Closed Pores

Modeling on Pore Variation of Coal Chars during CO₂Gasification Associated with Their Submicropores and Closed Pores