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Regenerative reverse-flow reactor system for cracking of producer gas tars

Tunå, Per LU ; Bauer, Fredric LU ; Hulteberg, Christian LU and Malek, Laura LU (2014) In Biomass Conversion and Biorefinery 4(1). p.43-51
Abstract
The gas produced in a biomass gasifier contains high amounts of tars which have to be removed prior to downstream utilization. Calcined dolomite is catalytically active for tar cracking reactions and resistant to sulfur poisoning. In this study, calcined dolomite was used as bed material in a reverse-flow reactor for cracking of tars in a model synthesis gas. 1-methylnaphthalene was used as model tar compound at a concentration of 15,000 mg/Nm3. The reactor system was operated at temperatures between 700 and 850 °C in the active zone. Total tar conversion was over 95 % for the system under reverse-flow conditions at the highest temperature. Already at the lowest temperature, up to 78 % of the 1-methylnaphthlene was converted, but mainly to... (More)
The gas produced in a biomass gasifier contains high amounts of tars which have to be removed prior to downstream utilization. Calcined dolomite is catalytically active for tar cracking reactions and resistant to sulfur poisoning. In this study, calcined dolomite was used as bed material in a reverse-flow reactor for cracking of tars in a model synthesis gas. 1-methylnaphthalene was used as model tar compound at a concentration of 15,000 mg/Nm3. The reactor system was operated at temperatures between 700 and 850 °C in the active zone. Total tar conversion was over 95 % for the system under reverse-flow conditions at the highest temperature. Already at the lowest temperature, up to 78 % of the 1-methylnaphthlene was converted, but mainly to other more stable tar compounds such as naphthalene and benzene, reaching a total tar conversion of only 23 %. To produce tar-free gas, higher temperatures are thus needed. The use of very high temperatures does, however, lead to a significant decrease in the specific area of the dolomite, as shown by BET surface measurements. The dolomite was further characterized with x-ray diffraction and energy dispersive spectroscopy. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dolomite, Biomass gasification, tar removal, tars
in
Biomass Conversion and Biorefinery
volume
4
issue
1
pages
43 - 51
publisher
Springer
external identifiers
  • scopus:84978022778
ISSN
2190-6815
DOI
10.1007/s13399-013-0088-0
language
English
LU publication?
yes
id
971026e1-8daa-42fe-a7ab-f8e6fae8e13f (old id 3972881)
alternative location
http://link.springer.com/10.1007/s13399-013-0088-0
date added to LUP
2013-08-19 09:34:01
date last changed
2017-01-01 03:03:59
@article{971026e1-8daa-42fe-a7ab-f8e6fae8e13f,
  abstract     = {The gas produced in a biomass gasifier contains high amounts of tars which have to be removed prior to downstream utilization. Calcined dolomite is catalytically active for tar cracking reactions and resistant to sulfur poisoning. In this study, calcined dolomite was used as bed material in a reverse-flow reactor for cracking of tars in a model synthesis gas. 1-methylnaphthalene was used as model tar compound at a concentration of 15,000 mg/Nm3. The reactor system was operated at temperatures between 700 and 850 °C in the active zone. Total tar conversion was over 95 % for the system under reverse-flow conditions at the highest temperature. Already at the lowest temperature, up to 78 % of the 1-methylnaphthlene was converted, but mainly to other more stable tar compounds such as naphthalene and benzene, reaching a total tar conversion of only 23 %. To produce tar-free gas, higher temperatures are thus needed. The use of very high temperatures does, however, lead to a significant decrease in the specific area of the dolomite, as shown by BET surface measurements. The dolomite was further characterized with x-ray diffraction and energy dispersive spectroscopy.},
  author       = {Tunå, Per and Bauer, Fredric and Hulteberg, Christian and Malek, Laura},
  issn         = {2190-6815},
  keyword      = {dolomite,Biomass gasification,tar removal,tars},
  language     = {eng},
  number       = {1},
  pages        = {43--51},
  publisher    = {Springer},
  series       = {Biomass Conversion and Biorefinery},
  title        = {Regenerative reverse-flow reactor system for cracking of producer gas tars},
  url          = {http://dx.doi.org/10.1007/s13399-013-0088-0},
  volume       = {4},
  year         = {2014},
}