A computational model of hydrogen production by steam reforming of dimethyl ether in a large scale CFB reactor. Part II: parametric analysis

Francis A. Elewuwa, Yassir T. Makkawi*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This study presents a computational parametric analysis of DME steam reforming in a large scale Circulating Fluidized Bed (CFB) reactor. The Computational Fluid Dynamic (CFD) model used, which is based on Eulerian-Eulerian dispersed flow, has been developed and validated in Part I of this study [1]. The effect of the reactor inlet configuration, gas residence time, inlet temperature and steam to DME ratio on the overall reactor performance and products have all been investigated. The results have shown that the use of double sided solid feeding system remarkable improvement in the flow uniformity, but with limited effect on the reactions and products. The temperature has been found to play a dominant role in increasing the DME conversion and the hydrogen yield. According to the parametric analysis, it is recommended to run the CFB reactor at around 300 °C inlet temperature, 5.5 steam to DME molar ratio, 4 s gas residence time and 37,104 ml gcat -1 h-1 space velocity. At these conditions, the DME conversion and hydrogen molar concentration in the product gas were both found to be around 80%.

Original languageEnglish
Pages (from-to)19819–19828
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number44
Early online date2 Sep 2016
DOIs
Publication statusPublished - 26 Nov 2016

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Steam reforming
hydrogen production
Hydrogen production
steam
Fluidized beds
beds
Ethers
ethers
reactors
inlet temperature
Steam
Gases
Hydrogen
products
gases
Temperature
Dynamic models
Computational fluid dynamics
hydrogen
computational fluid dynamics

Bibliographical note

Funding: EPSRC (EP/J501797/1).

Keywords

  • CFD modelling
  • dimethyl ether
  • fluidized bed
  • hydrogen
  • parametric analysis
  • steam reforming

Cite this

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title = "A computational model of hydrogen production by steam reforming of dimethyl ether in a large scale CFB reactor. Part II: parametric analysis",
abstract = "This study presents a computational parametric analysis of DME steam reforming in a large scale Circulating Fluidized Bed (CFB) reactor. The Computational Fluid Dynamic (CFD) model used, which is based on Eulerian-Eulerian dispersed flow, has been developed and validated in Part I of this study [1]. The effect of the reactor inlet configuration, gas residence time, inlet temperature and steam to DME ratio on the overall reactor performance and products have all been investigated. The results have shown that the use of double sided solid feeding system remarkable improvement in the flow uniformity, but with limited effect on the reactions and products. The temperature has been found to play a dominant role in increasing the DME conversion and the hydrogen yield. According to the parametric analysis, it is recommended to run the CFB reactor at around 300 °C inlet temperature, 5.5 steam to DME molar ratio, 4 s gas residence time and 37,104 ml gcat -1 h-1 space velocity. At these conditions, the DME conversion and hydrogen molar concentration in the product gas were both found to be around 80{\%}.",
keywords = "CFD modelling, dimethyl ether, fluidized bed, hydrogen, parametric analysis, steam reforming",
author = "Elewuwa, {Francis A.} and Makkawi, {Yassir T.}",
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A computational model of hydrogen production by steam reforming of dimethyl ether in a large scale CFB reactor. Part II : parametric analysis. / Elewuwa, Francis A.; Makkawi, Yassir T.

In: International Journal of Hydrogen Energy, Vol. 41, No. 44, 26.11.2016, p. 19819–19828.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A computational model of hydrogen production by steam reforming of dimethyl ether in a large scale CFB reactor. Part II

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AU - Elewuwa, Francis A.

AU - Makkawi, Yassir T.

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PY - 2016/11/26

Y1 - 2016/11/26

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AB - This study presents a computational parametric analysis of DME steam reforming in a large scale Circulating Fluidized Bed (CFB) reactor. The Computational Fluid Dynamic (CFD) model used, which is based on Eulerian-Eulerian dispersed flow, has been developed and validated in Part I of this study [1]. The effect of the reactor inlet configuration, gas residence time, inlet temperature and steam to DME ratio on the overall reactor performance and products have all been investigated. The results have shown that the use of double sided solid feeding system remarkable improvement in the flow uniformity, but with limited effect on the reactions and products. The temperature has been found to play a dominant role in increasing the DME conversion and the hydrogen yield. According to the parametric analysis, it is recommended to run the CFB reactor at around 300 °C inlet temperature, 5.5 steam to DME molar ratio, 4 s gas residence time and 37,104 ml gcat -1 h-1 space velocity. At these conditions, the DME conversion and hydrogen molar concentration in the product gas were both found to be around 80%.

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