The influence of geometrical factors and feedstock on gasification in a high temperature fluidised bed

Tomeczek, J.; Kudzia, W.; Gradonń, B.; Remarczyk, L.

doi:10.1002/cjce.5450650512

Cited by 10 publications

(2 citation statements)

References 2 publications

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“…Similar results are also reported by Gil et al [32] for gasification of pine wood chips. While studying the influence of particle size and reactor geometry in a fluidized bed gasification of coal and coal-derived char, Tomeczek et al [33] observed that char required more residence time than coal to produce product gas of the similar calorific value. Pan et al [16] observed that the superficial velocities of 0.76-1.45 m/s were too high or in other words residence times 1.7-3.5 s were too low, to achieve water-gas shift reaction equilibrium conditions.…”

Section: Air and Steam Flowmentioning

confidence: 99%

Cogasification of Coal and Biomass: A Review

Brar

Singh

Wang

et al. 2012

International Journal of Forestry Research

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Recently, there has been significant research interest in cogasification of coal and various types of biomass blends to improve biomass gasification by reducing the tar content in the product gas. In addition, ash present in biomass catalyzes the gasification of coal. However, due to the fibrous nature of biomass and the large difference in gasification temperature of coal and biomass, cogasification in existing systems presents technical challenges. This paper documents research studies conducted on the cogasification of various types of coal and biomass using different types of gasifiers under various sets of operating conditions. In addition, the influence of cogasification on upstream and downstream processing is presented.

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Section: Air and Steam Flowmentioning

confidence: 99%

Cogasification of Coal and Biomass: A Review

Brar

Singh

Wang

et al. 2012

International Journal of Forestry Research

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“…Nevertheless, these models assume steady‐state conditions, which do not fully represent the reality of fluidized bed gasifiers. Furthermore, certain emulsion phase particles experience intraparticle mass transfer phenomena and changes in porosity and reactivity 4,14,15 which these models do not account for.…”

Section: Introductionmentioning

confidence: 99%

Modeling a fluidized bed reactor by integrating various scales: Pore, particle, and reactor

et al. 2021

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This work proposes a novel population‐balance based model for a bubbling fluidized bed reactor. This model considers two continuum phases: bubble and emulsion. The evolution of the bubble size distribution was modeled using a population balance, considering both axial and radial motion. This sub‐model involves a new mathematical form for the aggregation frequency, which predicts the migration of bubbles from the reactor wall toward the reactor center. Additionally, reacting particles were considered as a Lagrangian phase, which exchanges mass with emulsion phases. For each particle, the variation of the pore size distribution was also considered. The model presented here accurately predicted the experimental data for biochar gasification in a lab‐scale bubbling fluidized bed reactor. Finally, the aggregation frequency is shown to serve as a scaling parameter.

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Investigation into the operation of an autothermal two-section subbituminous coal fluidized bed gasifier

Abaimov

Рыжков

Dubinin

et al. 2023

Int J Coal Sci Technol

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Using a newly developed experimental setup, the features and advantages of an autothermal single-casing atmospheric subbituminous coal fluidized bed air-blown gasifier, combining a combustion and gasification section, and mixing the dispersed phase (inert material, char) and heat exchange between them through an annular transfer device, have been revealed. To increase the efficiency of the gasifier, an experimental-computational method was developed find the conditions for optimal operation, combining changing the annular flow’s geometry and regulating the primary air for gasification. A simple and reliable multizone thermodynamic calculation model makes it possible to predict the composition of char and syngas in the gasification section with acceptable accuracy. This method confirmed that a two-section fluidized bed gasifier can provide efficient gasification of solid fuels and is suitable for use in small-scale cogeneration plants. Syngas with a heating value of 3.6–4.5 MJ/m3 and CGE of 38.2%–42.3% was obtained in the experimental setup without optimizing the primary air flow rate. With optimization, the indicators increased to the heating value of syngas of 5.20–5.34 MJ/m3 and CGE of 42.5%–50.0%. With heat regeneration of 0.8, CGE increases to 70%.

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The influence of geometrical factors and feedstock on gasification in a high temperature fluidised bed

Cited by 10 publications

References 2 publications

Cogasification of Coal and Biomass: A Review

Cogasification of Coal and Biomass: A Review

Modeling a fluidized bed reactor by integrating various scales: Pore, particle, and reactor

Investigation into the operation of an autothermal two-section subbituminous coal fluidized bed gasifier

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