Heat and mass transfer in a high temperature packed moving bed subject to an external radiative source

Belghit, Abdelhamid; Daguenet, M.; Reddy, A. Venumadhav

doi:10.1016/s0009-2509(99)00575-8

Cited by 17 publications

(7 citation statements)

References 16 publications

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“…A reference value of J was taken as J o = 2.165·10 5 W/m 2 corresponding to a constant highly concentrated net solar flux required to heat up the solid bed to 1400K. This flux density value, obtained through a thermal balance at the reactor entrance, is in agreement with other studies [3,37]. For instance, in [44] the energy flux was around 0.4-0.8 MW/m 2 , in [45] it was brought up to 1 MW/m 2 and a value of 0.5 MW/m 2 was used in [46].…”

Section: Solar-driven Gasificationsupporting

confidence: 77%

“…The HTAG revealed to be the most insensitive to particle size variations [18]. In the solar driven reactor decreasing particle's diameter will increase the contact area, improving heat exchange by a more rapid radiation absorption, as well as conversion efficiency [3,37]. The effect of particle size issue could be addressed by using more ad-hoc pyrolysis models.…”

Section: Limitations Of the Modelmentioning

confidence: 99%

“…Several publications have also appeared in recent years documenting the feasibility of gasification of biomass using an external heating source ('allothermal' gasification) using steam [3] or CO 2 [25,26] as an agent, where the temperatures necessary to drive the high endothermic gasification reaction can be developed by the gasification agent itself, steam.…”

Section: Introductionmentioning

confidence: 99%

“…For steam only technologies, there are several additional advantages: (1) No combustion derived pollutants; (2) No dilution caused by presence of N 2 in the end gas; (3) No oxygen plant is required respects to an air/oxygen blown gasifier.…”

Section: Introductionmentioning

confidence: 99%

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Assessing biomass steam gasification technologies using a multi-purpose model

Sepe

Li²,

Paul

2016

Energy Conversion and Management

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Two advanced steam-gasification technologies of biomass, high temperature steam gasification (HTSG) and solar-assisted steam gasification, have been thermodynamically investigated in this work and compared with both conventional auto-thermal gasification and High Temperature Air and Steam Gasification (HTAG). A multi-phase, multi-physics 1D steady-state model has been built up to predict the biomass gasification performance, efficiency, yield and species of produced syngas at varying gasification methods and input parameters. In particular, heterogeneous and homogenous gasification reactions coupled with a radiative transfer were employed in the solar-assisted steam gasification. The results showed that the solar-assisted steam gasification technology demonstrates its potential to produce high quality syngas (nearly 42% H 2 and 35% CO). Moreover, it upgrades the heating value of the product syngas up to 1.4 times more than the original value, due to the additional solar energy induction. Compared with conventional auto-thermal gasification, it was found that the process efficiency can be improved from 65% to 81% if using the HTAG technology and the content of hydrogen in the syngas increased from 30% to 55% if applying HTSG. The modelling results agree considerably with the reported experimental and modelling data in literature, and also able to return a direct comparison of advantage and disadvantage of each gasification method, in terms of syngas quantity and quality.

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Section: Solar-driven Gasificationsupporting

confidence: 77%

Section: Limitations Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessing biomass steam gasification technologies using a multi-purpose model

Sepe

Li²,

Paul

2016

Energy Conversion and Management

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“…In this work, the authors assumed a linear function of the temperature with the reactor length. Belghit et al (2000) proposed a numerical model for a moving chemical bed reactor which was used for gasifying coal using concentrated solar radiation. They considered one dimensional mass and energy balances for adiabatic reactor.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Noncatalytic Gas-Solid Reaction in a Moving Bed Reactor

Arabi¹,

Hashemipour²

2008

Chemical Product and Process Modeling

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This work is a simulation of a countercurrent moving bed reactor in which a reduction of porous iron ore pellets to sponge iron is performed. Simultaneous mass and energy balances of the reactor will lead to a set of ordinary differential equations. The iron ore reduction kinetics was modeled with a three-stage shrinking core model. Solving the ODE system allows prediction of the concentration and temperature profiles of all species within the reactor.The model is validated with experimental data obtained during operation of the bench-scale and full-scale processes and allows optimization of the process. The model is used to explore the behavior of the reactor when residence time of pellets is changed in order to increase or decrease the solid conversion. Also, it is used to explore the performance of the reactor under different conditions.

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Interactions between gas flow and reversible chemical reaction in porous media

Jiang

Zhang

et al. 2017

J. Cent. South Univ.

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Heat and mass transfer in a high temperature packed moving bed subject to an external radiative source

Cited by 17 publications

References 16 publications

Assessing biomass steam gasification technologies using a multi-purpose model

Assessing biomass steam gasification technologies using a multi-purpose model

Modeling and Simulation of Noncatalytic Gas-Solid Reaction in a Moving Bed Reactor

Interactions between gas flow and reversible chemical reaction in porous media

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