Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
An integrated gasification zero emission plant using oxygen produced in a mixed conducting membrane reactor
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
2006 (English)In: Proceedings of the ASME Turbo Expo 2006, vol 4, 2006, 33-40 p.Conference paper, Published paper (Refereed)
Abstract [en]

Integrated gasification combined cycles (IGCCs) exhibit conditions favourable to CO, sequestration. In this article, simulations of the Integrated Gasification Zero Emission Plant (IGZEP) concept are presented. The idea behind this concept is to use oxygen produced in a Mixed Conducting Membrane (MCM) reactor in an IGCC. Previous studies have shown that it is beneficial to integrate an MCM reactor in a natural gas fired cycle, and the objective of this article is to quantify the advantages of integrating the same type of reactor with an IGCC the way it is suggested in the IGZEP concept. The core of the membrane reactor is a ceramic membrane, which separates oxygen from air exiting the gas turbine compressor. The reactor operates at temperatures around 900 degrees C and is driven by a difference in oxygen partial pressure. The oxygen permeating the membrane is used in a Texaco gasifier, whereas the oxygen-depleted air is sent to a high temperature combustor. The rest of the cycle is essentially similar to a "standard" IGCC. The simulations performed resulted in a CO(2) capture penalty of 6.4% points (Lower Heating Value, LHV) and a net cycle efficiency of 32.5% (LHV). Despite this quite low efficiency, the IGZEP concept is interesting since one of the main reasons for the low net efficiencies is the low efficiency of the Texaco gasifier model used. Other models for Texaco gasifiers with higher efficiency have been found in literature. Nevertheless, it is judged more interesting to compare IGZEP's penalty for oxygen generation with that of existing competitors. It is shown that the total oxygen production penalty can be decreased from 4.9% points in the reference case to 4.3% points in IGZEP. That is, about 0.6% points in net efficiency may be gained by replacing a standard (non-integrated) cryogenic air distillation unit with an MCM reactor. Other studies have also shown that this strategy may entail lower investment and electricity production costs.

Place, publisher, year, edition, pages
2006. 33-40 p.
Keyword [en]
Integrated gasification combined cycle, Mixed conducting membrane, Oxygen production penalty
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-9350ISI: 000243378600004Scopus ID: 2-s2.0-33750852524ISBN: 0-7918-4239-8 (print)OAI: oai:DiVA.org:kth-9350DiVA: diva2:113574
Conference
51st ASME Turbo Expo 2006 Location: Barcelona, SPAIN Date: MAY 06-11, 2006
Note
QC 20100820Available from: 2008-10-22 Created: 2008-10-22 Last updated: 2011-09-30Bibliographically approved
In thesis
1. A trinity of sense: Using biomass in the transport sector for climate change mitigation
Open this publication in new window or tab >>A trinity of sense: Using biomass in the transport sector for climate change mitigation
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis analyses two strategies for decreasing anthropogenic carbon dioxide (CO2) emissions: to capture and store CO2, and to increase the use of biomass. First, two concepts for CO2 capture with low capture penalties are evaluated. The concepts are an integrated gasification combined cycle where the oxygen is supplied by a membrane reactor, and a hybrid cycle where the CO2 is captured at elevated pressure. Although the cycles have comparatively high efficiencies and low penalties, they illustrate the inevitable fact that capturing CO2 will always induce significant efficiency penalties. Other strategies are also needed if CO2 emissions are to be forcefully decreased. An alternative is increased use of biomass, which partially could be used for production of motor fuels (biofuels). This work examines arguments for directing biomass to the transport sector, analyses how biofuels (and also some other means) may be used to reduce CO2 emissions and increase security of motor fuel supply. The thesis also explores the possibility of reducing CO2 emissions by comparatively easy and cost-efficient CO2 capture from concentrated CO2 streams available in some types of biofuel plants. Many conclusions of the thesis could be associated with either of three meanings of the word sense: First, there is reason in biofuel production – since it e.g. reduces oil dependence. From a climate change mitigation perspective, however, motor fuel production is often a CO2-inefficient use of biomass, but the thesis explores how biofuels’ climate change mitigation effects may be increased by introducing low-cost CO2 capture. Second, the Swedish promotion of biofuels appears to have been governed more by a feeling for attaining other goals than striving for curbing climate change. Third, it seems to have been the prevalent opinion among politicians that the advantages of biofuels – among them their climate change mitigation benefits – are far greater than the disadvantages and that they should be promoted. Another conclusion of the thesis is that biofuels alone are not enough to drastically decrease transport CO2 emissions; a variety of measures are needed such as fuels from renewable electricity and improvements of vehicle fuel economy.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 68 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:62
Keyword
Biofuel, biomass, carbon dioxide capture and storage, energy systems, ethanol, hybrid cycle, mixed conducting membrane reactor, pressurized fluidized bed combustion, Sweden, transport
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-9292 (URN)978-91-7415-107-7 (ISBN)
Public defence
2008-11-07, F3, KTKH, Lindstedtsvägen 26, Stockholm, 13:30 (English)
Opponent
Supervisors
Note
QC 20100823Available from: 2008-10-22 Created: 2008-10-16 Last updated: 2010-08-23Bibliographically approved

Open Access in DiVA

No full text

Scopus

Search in DiVA

By author/editor
Lindfeldt, Erik G.Westermark, Mats O.
By organisation
Energy Processes
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 192 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf