Coal-gasification kinetics derived from pyrolysis in a fluidized-bed reactor

Lee, Jong Min; Kim, Yong Jeon; Lee, Woon Jae; Kim, Sang Done

doi:10.1016/s0360-5442(98)00011-5

Cited by 77 publications

(42 citation statements)

References 23 publications

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“…-Char gasification starts in the bed and is completed in the freeboard. According to Lee et al [14], combustion and gasification take place in the main bed region and pyrolysis in the freeboard region. -Based on the shrinking core model, particles are considered spherical and of uniform size and the average diameter remains constant during gasification.…”

Section: Model Assumptionsmentioning

confidence: 99%

“…According to Lee et al [14], the reaction rate equations defined for the mentioned reactions are as follows:…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…The importance of considering varying superficial gas velocity in obtaining results with higher precision in simulation is demonstrated by Yan et al [26]. According to Kunii and Levenspiel [24], the bed void fraction is calculated using the following equation: (14) where ε mf = 0.4.…”

Section: Bed Hydrodynamicsmentioning

confidence: 99%

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Incineration of Pre-Treated Municipal Solid Waste (MSW) for Energy Co-Generation in a Non-Densely Populated Area

Faria¹,

Ruiz²

2015

Solid Waste as a Renewable Resource

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Abstract:Gasification is a thermo-chemical process to convert carbon-based products such as biomass and coal into a gas mixture known as synthetic gas or syngas. Various types of gasification methods exist, and fluidized bed gasification is one of them which is considered more efficient than others as fuel is fluidized in oxygen, steam or air. This paper presents an experimental and numerical investigation of fluidized bed gasification of solid waste (SW) (wood). The experimental measurement of syngas composition was done using a pilot scale gasifier. A numerical model was developed using Advanced System for Process ENgineering (Aspen) Plus software. Several Aspen Plus reactor blocks were used along with user defined FORTRAN and Excel code. The model was validated with experimental results. The study found very similar performance between simulation and experimental results, with a maximum variation of 3%. The validated model was used to study the effect of air-fuel and steam-fuel ratio on syngas composition. The model will be useful to predict the various operating parameters of a pilot scale SW gasification plant, such as temperature, pressure, air-fuel ratio and steam-fuel ratio. Therefore, the model can assist researchers, professionals and industries to identify optimized conditions for SW gasification.

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Section: Model Assumptionsmentioning

confidence: 99%

“…According to Lee et al [14], the reaction rate equations defined for the mentioned reactions are as follows:…”

Section: Reaction Kineticsmentioning

confidence: 99%

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Incineration of Pre-Treated Municipal Solid Waste (MSW) for Energy Co-Generation in a Non-Densely Populated Area

Faria¹,

Ruiz²

2015

Solid Waste as a Renewable Resource

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“…Some subroutines are integrated for simulating biomass devolatilization and the evolutions of tar and char. Relevant empirical correlations [4,5,7,22,23] are adapted and employed in the subroutines. As illustrated in Fig.…”

Section: Simulationmentioning

confidence: 99%

“…ASPEN Plus is often used to simulate the coal/biomass conversion processes. Sotudeh-Gharebaagh et al [3] used it to predict coal combustion in a CFB combustor regarding combustion efficiency, emission levels of CO, SO 2 , and NO x , as well as concentration profiles of O 2 and CO. Lee et al [4] presented the kinetic expressions for steam-char and oxygen-char reactions in the atmospheric coal gasification in a fluidized bed reactor. These expressions were cited by Nikoo et al [5] in the biomass gasification simulation with ASPEN Plus.…”

Section: Introductionmentioning

confidence: 99%

Simulation of biomass gasification in a dual fluidized bed gasifier

Göransson

Söderlind

et al. 2012

Biomass Conv. Bioref.

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Biomass gasification with steam in a DFBG (dual fluidized bed gasifier) was simulated with ASPEN Plus. From the model, the yield and composition of the syngas, and the contents of tar and char can be calculated. The model has been evaluated against the experimental results measured on a 150 KWth MIUN (Mid Sweden University) DFBG. The model predicts that the content of char transferred from the gasifier to the combustor decreases from 22.5 wt. % of the dry and ash-free biomass at gasification temperature 750• C to 11.5 wt. % at 950• C, but is insensitive to S/B (Steam to Biomass Mass Ratio). The H 2 concentration is higher than that of CO under the normal DFBG operation conditions, but they will change positions when the gasification temperature is too high above about 950• C, or the S/B ratio is too low under about 0.15. The biomass moisture content is a key parameter for a DFBG to be operated and maintained at a high gasification temperature. The model suggests that the gasification temperature is difficult to be kept above 850• C when the biomass moisture content is higher than 15.0 wt. %. Thus, a certain amount of biomass needs to be added in the combustor to provide sufficient heat for biomass devolatilization and steam reforming. Tar content in the syngas can also be predicted from the model, which shows a decreasing trend of the tar with the gasification temperature and the S/B ratio. The tar content in the syngas decreases significantly with gasification residence time which is a key parameter.

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Preparation of LiMn₂O₄ powders via spray pyrolysis and fluidized bed hybrid system

et al. 2006

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Coal-gasification kinetics derived from pyrolysis in a fluidized-bed reactor

Cited by 77 publications

References 23 publications

Incineration of Pre-Treated Municipal Solid Waste (MSW) for Energy Co-Generation in a Non-Densely Populated Area

Incineration of Pre-Treated Municipal Solid Waste (MSW) for Energy Co-Generation in a Non-Densely Populated Area

Simulation of biomass gasification in a dual fluidized bed gasifier

Preparation of LiMn₂O₄ powders via spray pyrolysis and fluidized bed hybrid system

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Coal-gasification kinetics derived from pyrolysis in a fluidized-bed reactor

Cited by 77 publications

References 23 publications

Incineration of Pre-Treated Municipal Solid Waste (MSW) for Energy Co-Generation in a Non-Densely Populated Area

Incineration of Pre-Treated Municipal Solid Waste (MSW) for Energy Co-Generation in a Non-Densely Populated Area

Simulation of biomass gasification in a dual fluidized bed gasifier

Preparation of LiMn2O4 powders via spray pyrolysis and fluidized bed hybrid system

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Preparation of LiMn₂O₄ powders via spray pyrolysis and fluidized bed hybrid system