Indian Sub-bituminous and Low-Rank Coal Gasification Experiments in a Circulating Fluidized Bed Gasifier Under Air Atmosphere

Dwivedi, Krishna Kant; Prabhansu, -; Pramanick, Achintya Kumar; Karmakar, Malay; Chatterjee, Pradip K.

doi:10.1007/978-981-15-0124-1_70

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…Some other research article explained about effect of temperature on gasification. The char yield decreases with gasification temperature [60][61]. Therefore, it is difficult to determine the effect on gas viscosity by changing system temperature as density of gas also changes with the changes of system temperature.…”

Section: Temperature-effectmentioning

confidence: 99%

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Dwivedi¹,

Karmakar²,

Pramanick³

et al. 2019

IJHT

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In this paper a brief review on hydrodynamic characteristic of coal gasification is presented. Firstly an introduction of hydrodynamics then parameters related to hydrodynamics is discussed. In the last several decades Coal gasification is an important method to use of coal resources. The hydrodynamic characteristics have an important role to design of Circulating fluidized bed gasifiers. Circulating fluidized bed (CFB) gasifiers widely use due to their high reaction rates and high thermal efficiency. The present study includes some hydrodynamics properties of coal gasification such as effect of pressure and temperature, solid hold up, solid circulation rate, gas-solid contact, particle residency time, coal feeding rate and coal feeding position. During the brief review on hydrodynamics characteristics of coal each section of CFBs such as riser, cyclone, stand-pipe and loop seal have been considered.

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Section: Temperature-effectmentioning

confidence: 99%

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Dwivedi¹,

Karmakar²,

Pramanick³

et al. 2019

IJHT

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“…However, apart from the whole CFB loop, the knowledge of particle flow hydrodynamics in riser section plays an important role in CFB systems. Various experimentations have been performed to reveal the particle flow characteristics and parametric influences on the CFB system performance (Qiu et al, 2015;Dwivedi et al, 2020;Hassan and Makkawi, 2018). These research studies have been focused on the gas-particle flow characteristics in the whole CFB system (Jiang et al, 2014) or particle distribution in the riser section (Wu et al, 2018;Prabhansu et al, 2020;Issangya et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser

Dwivedi

Pramanick

Karmakar³

et al. 2020

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Purpose The purpose of this paper is to perform the computational fluid dynamics (CFD) simulation with experimental validation to investigate the particle segregation effect in abrupt and smooth shapes circulating fluidized bed (CFB) risers. Design/methodology/approach The experimental investigations were carried out in lab-scale CFB systems and the CFD simulations were performed by using commercial software BARRACUDA. Special attention was paid to investigate the gas-particle flow behavior at the top of the riser with three different superficial velocities, namely, 4, 6 and 7.7 m/s. Here, a CFD-based noble simulation approach called multi-phase particle in cell (MP-PIC) was used to investigate the effect of traditional drag models (Wen-Yu, Ergun, Wen-Yu-Ergun and Richardson-Davidson-Harrison) on particle flow characteristics in CFB riser. Findings Findings from the experimentations revealed that the increase in gas velocity leads to decrease the mixing index inside the riser. Moreover, the solid holdup found more in abrupt riser than smooth riser at the constant gas velocity. Despite the more experimental investigations, the findings with CFD simulations revealed that the MP-PIC approach, which was combined with different drag models could be more effective for the practical (industrial) design of CFB riser. Well agreement was found between the simulation and experimental outputs. The simulation work was compared with experimental data, which shows the good agreement (<4%). Originality/value The experimental and simulation study performed in this research study constitutes an easy-to-use with different drag coefficient. The proposed MP-PIC model is more effective for large particles fluidized bed, which can be helpful for further research on industrial gas-particle fluidized bed reactors. This study is expected to give throughout the analysis of CFB hydrodynamics with further exploration of overall fluidization.

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Indian Sub-bituminous and Low-Rank Coal Gasification Experiments in a Circulating Fluidized Bed Gasifier Under Air Atmosphere

Cited by 2 publications

References 10 publications

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser

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