Cargando…

Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification

[Image: see text] Chemical looping gasification (CLG) is an emerging process that aims to produce valuable chemical feedstocks. The key operational requirement of CLG is to limit the oxygen transfer from the air reactor (AR) to the fuel reactor (FR). This can be accomplished by partially oxidizing t...

Descripción completa

Detalles Bibliográficos
Autores principales: Purnomo, Victor, Mei, Daofeng, Soleimanisalim, Amir H., Mattisson, Tobias, Leion, Henrik
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9442637/
https://www.ncbi.nlm.nih.gov/pubmed/36081857
http://dx.doi.org/10.1021/acs.energyfuels.2c00944
_version_ 1784782859888754688
author Purnomo, Victor
Mei, Daofeng
Soleimanisalim, Amir H.
Mattisson, Tobias
Leion, Henrik
author_facet Purnomo, Victor
Mei, Daofeng
Soleimanisalim, Amir H.
Mattisson, Tobias
Leion, Henrik
author_sort Purnomo, Victor
collection PubMed
description [Image: see text] Chemical looping gasification (CLG) is an emerging process that aims to produce valuable chemical feedstocks. The key operational requirement of CLG is to limit the oxygen transfer from the air reactor (AR) to the fuel reactor (FR). This can be accomplished by partially oxidizing the oxygen carrier in the AR, which may lead to a higher reduction degree of the oxygen carrier under the fuel conversion. A highly reduced oxygen carrier may experience multiple issues, such as agglomeration and defluidization. Given such an interest, this study examined how the variation of the mass conversion degree of ilmenite may affect the conversion of pine forest residue char in a fluidized bed batch reactor. Ilmenite was pre-reduced using diluted CO and then underwent the char conversion at 850, 900, 950, and 975 °C. Our investigations showed that the activation energy of the char conversion was between 194 and 256 kJ/mol, depending upon the mass conversion degree of ilmenite. Furthermore, the hydrogen partial pressure in the particle bed increased as the oxygen carrier mass conversion degree decreased, which was accompanied by a lower reaction rate and a higher reduction potential. Such a hydrogen inhibition effect was confirmed in the experiments; therefore, the change in the mass conversion degree indirectly affected the char conversion. Langmuir–Hinshelwood mechanism models used to evaluate the char conversion were validated. On the basis of the physical observation and characterizations, the use of ilmenite in CLG with biomass char as fuel will likely not suffer from major agglomeration or fluidization issues.
format Online
Article
Text
id pubmed-9442637
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher American Chemical Society
record_format MEDLINE/PubMed
spelling pubmed-94426372022-09-06 Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification Purnomo, Victor Mei, Daofeng Soleimanisalim, Amir H. Mattisson, Tobias Leion, Henrik Energy Fuels [Image: see text] Chemical looping gasification (CLG) is an emerging process that aims to produce valuable chemical feedstocks. The key operational requirement of CLG is to limit the oxygen transfer from the air reactor (AR) to the fuel reactor (FR). This can be accomplished by partially oxidizing the oxygen carrier in the AR, which may lead to a higher reduction degree of the oxygen carrier under the fuel conversion. A highly reduced oxygen carrier may experience multiple issues, such as agglomeration and defluidization. Given such an interest, this study examined how the variation of the mass conversion degree of ilmenite may affect the conversion of pine forest residue char in a fluidized bed batch reactor. Ilmenite was pre-reduced using diluted CO and then underwent the char conversion at 850, 900, 950, and 975 °C. Our investigations showed that the activation energy of the char conversion was between 194 and 256 kJ/mol, depending upon the mass conversion degree of ilmenite. Furthermore, the hydrogen partial pressure in the particle bed increased as the oxygen carrier mass conversion degree decreased, which was accompanied by a lower reaction rate and a higher reduction potential. Such a hydrogen inhibition effect was confirmed in the experiments; therefore, the change in the mass conversion degree indirectly affected the char conversion. Langmuir–Hinshelwood mechanism models used to evaluate the char conversion were validated. On the basis of the physical observation and characterizations, the use of ilmenite in CLG with biomass char as fuel will likely not suffer from major agglomeration or fluidization issues. American Chemical Society 2022-06-13 2022-09-01 /pmc/articles/PMC9442637/ /pubmed/36081857 http://dx.doi.org/10.1021/acs.energyfuels.2c00944 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Purnomo, Victor
Mei, Daofeng
Soleimanisalim, Amir H.
Mattisson, Tobias
Leion, Henrik
Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification
title Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification
title_full Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification
title_fullStr Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification
title_full_unstemmed Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification
title_short Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification
title_sort effect of the mass conversion degree of an oxygen carrier on char conversion and its implication for chemical looping gasification
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9442637/
https://www.ncbi.nlm.nih.gov/pubmed/36081857
http://dx.doi.org/10.1021/acs.energyfuels.2c00944
work_keys_str_mv AT purnomovictor effectofthemassconversiondegreeofanoxygencarrieroncharconversionanditsimplicationforchemicalloopinggasification
AT meidaofeng effectofthemassconversiondegreeofanoxygencarrieroncharconversionanditsimplicationforchemicalloopinggasification
AT soleimanisalimamirh effectofthemassconversiondegreeofanoxygencarrieroncharconversionanditsimplicationforchemicalloopinggasification
AT mattissontobias effectofthemassconversiondegreeofanoxygencarrieroncharconversionanditsimplicationforchemicalloopinggasification
AT leionhenrik effectofthemassconversiondegreeofanoxygencarrieroncharconversionanditsimplicationforchemicalloopinggasification