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
Oxygen efficiency with regard to carbon capture
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.ORCID iD: 0000-0003-3315-4201
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: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 31, no 15, 3220-3226 p.Article in journal (Refereed) Published
Abstract [en]

Carbon capture is often discussed in the literature with the sole focus on power processes, despite the fact that carbon dioxide emissions from other sources are just as relevant for the impact on the atmosphere. Furthermore, some carbon capture methods are relatively inefficient when applied to power production processes. Carbon capture should preferably be performed where the cost is as low as possible, i.e. not necessarily from power production processes. As an example, carbon capture using combustion with pure oxygen is far more energy efficient if it is used together with lime kilns or cement kilns than together with power production processes. A new concept termed "oxygen efficiency" is introduced in this paper. It describes the amount of carbon dioxide that can potentially be captured per unit of oxygen. As such, the oxygen efficiency quantifies the value of a certain unit of oxygen for carbon capture reasons. The base concept is that the energy penalty for the production of one part of oxygen is the same no matter where it is produced; hence, if this unit of oxygen can be used to capture more carbon dioxide, it is more efficient. Typically, the oxygen efficiency would be five times greater for carbon capture when utilising pure oxygen together with cement kilns rather than together with methane-fired power plants. Furthermore, the concept of oxygen efficiency illustrates the importance of considering how carbon capture methods can be utilised in the most efficient way, in addition to evaluating which carbon capture method is the most suitable for a particular technology.

Place, publisher, year, edition, pages
2006. Vol. 31, no 15, 3220-3226 p.
Keyword [en]
oxygen combustion, carbon capture, cement kiln, lime kiln
National Category
Chemical Process Engineering
Identifiers
URN: urn:nbn:se:kth:diva-10974DOI: 10.1016/j.energy.2006.03.002ISI: 000241246600013Scopus ID: 2-s2.0-33748298913OAI: oai:DiVA.org:kth-10974DiVA: diva2:233594
Note
QC 20100727Available from: 2009-09-01 Created: 2009-09-01 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Opportunities and uncertainties in the early stages of development of CO2 capture and storage
Open this publication in new window or tab >>Opportunities and uncertainties in the early stages of development of CO2 capture and storage
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The topic of this thesis is carbon dioxide (CO2) capture and storage (CCS), which is a technology that is currently being promoted by industries, scientists and governments, among others, in order to mitigate climate change despite a continued use of fossil fuels. Because of the complex nature of CCS and the risks it entails, it is controversial. The aim of this thesis is to analyse how the technology may be further developed in a responsible manner. In the first part of the thesis different methods for capturing CO2 from industrial processes as well as power plants are analysed. The aim is to identify early opportunities for CO2 capture, which is considered important because of the urgency of the climate change problem. Three potential early opportunities are studied: i) capturing CO2 from calcining processes such as cement industries by using the oxyfuel process, ii) capturing CO2 from pressurised flue gas, and iii) capturing CO2 from hybrid combined cycles. Each opportunity has properties that may make them competitive in comparison to the more common alternatives if CCS is realised. However, there are also drawbacks. For example, while capturing CO2 from pressurised flue gas enables the use of more compact capture plant designs as well as less expensive and less toxic absorbents, the concept is neither suitable for retrofitting nor has it been promoted by the large and influential corporations. The second part of the thesis has a broader scope than the first and is multidisciplinary in its nature with inspiration from the research field of Science and Technology Studies (STS). The approach is to critically analyse stakeholder percep-tions regarding CCS, with a specific focus on the CCS experts. The thesis sheds new light on the complexity and scientific uncertainty of CCS as well as on the optimism among many of its proponents. Because of the uncertain development when it comes to climate change, fossil fuel use and greenhouse gas emissions, the conclusion is that CCS has to be further developed and demonstrated. A responsible strategy for a future development of CCS would benefit from: i) a search for win-win strategies, ii) increasing use of appropriate analytical tools such as life-cycle analysis, iii) a consideration of fossil fuel scarcity and increasing price volatility, iv) funding of unbiased research and v) increasing simultaneous investments in long-term solutions such as renewable energy alternatives and efficiency improvements.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. viii, 68 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2009:50
Keyword
Acceptance, cement, CCS, CO2 capture and storage, early opportunities, enhanced oil recovery, expert opinions, hybrid power cycles, optimism, oxyfuel combustion, pressurised fluidised bed combustion, pilot plant, potassium carbonate, risk, Sargas, scenario studies, scientific uncertainty, stakeholder perceptions
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:kth:diva-10985 (URN)978-91-7415-413-9 (ISBN)
Public defence
2009-09-28, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100727Available from: 2009-09-08 Created: 2009-09-01 Last updated: 2010-07-27Bibliographically approved
2. All CO2 molecules are equal, but some CO2 molecules are more equal than others
Open this publication in new window or tab >>All CO2 molecules are equal, but some CO2 molecules are more equal than others
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis deals with some challenges related to the mitigation of climate change and the overall aim is to present and assess different possibilities for the mitigation of climate change by:

• Suggesting some measures with a potential to abate net greenhouse gas (GHG) emissions,

• Discussing ideas for how decision-makers could tackle some of the encountered obstacles linked to these measures, and

• Pointing at some problems with the current Kyoto framework and suggesting modifications of it.

The quantification of the net CO2 effect from a specific project, frequently referred to as emissions accounting, is an important tool to evaluate projects and strategies for mitigating climate change. This thesis discusses different emissions accounting methods. It is concluded that no single method ought to be used for generalisation purposes, as many factors may affect the real outcome for different projects. The estimated outcome is extremely dependent on the method chosen and, thus, the suggested approach is to apply a broader perspective than the use of a particular method for strategic decisions. The risk of losing the integrity of the Kyoto Protocol when over-simplified emissions accounting methods are applied for the quantification of emission credits that can be obtained by a country with binding emissions targets for projects executed in a country without binding emission targets is also discussed.

Driving forces and obstacles with regard to energy-related co-operations between industries and district heating companies have been studied since they may potentially reduce net GHG emissions. The main conclusion is that favourable techno-economic circumstances are not sufficient for the implementation of a co-operation; other factors like people with the true ambition to co-operate are also necessary.

How oxy-fuel combustion for CO2 capture and storage (CCS) purposes may be much more efficiently utilised together with some industrial processes than with power production processes is also discussed. As cost efficiency is relevant for the Kyoto framework, this thesis suggests that CCS performed on CO2 from biomass should be allowed to play on a level playing field with CCS from fossil sources, as the outcome for the atmosphere is independent of the origin of the CO2.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 71 p.
Series
Trita-KET, ISSN 1104-3466 ; 221
Keyword
climate change mitigation, abatement of GHG-emissions, co-operation, district heating, waste-heat utilisation
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-452 (URN)91-7178-163-3 (ISBN)
Public defence
2005-10-21, Sal D3, Lindstedtsvägen 5, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101015Available from: 2005-10-18 Created: 2005-10-18 Last updated: 2010-10-15Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Authority records BETA

Grönkvist, Stefan

Search in DiVA

By author/editor
Grönkvist, StefanBryngelsson, MårtenWestermark, Mats
By organisation
Energy Processes
In the same journal
Energy
Chemical Process Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 209 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