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Impurity impacts on the purification process in oxy-fuel combustion based CO2 capture and storage system
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.
Vattenfall Research and Development AB.
Vattenfall Research and Development AB.
2009 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 86, no 2, 202-213 p.Article in journal (Refereed) Published
Abstract [en]

Based on the requirements of CO2 transportation and storage, non-condensable gases, such as O-2, N-2 and At should be removed from the CO2-stream captured from an oxy-fuel combustion process. For a purification process, impurities have great impacts on the design, operation and optimization through their impacts on the thermodynamic properties of CO2-streams. Study results show that the increments of impurities will make the energy consumption of purification increase: and make CO2 purity of separation product and CO2 recovery rate decrease, In addition, under the same operating conditions, energy consumptions have different sensitivities to the variation of the impurity mole fraction of feed fluids. The isothermal compression work is more sensitive to the variation of SO2: while the isentropic compression work is more sensitive to the variation of Ar. In the flash system, the energy consumption of condensation in is more sensitive to the variation of Ar; but in the distillation system, the energy consumption of condensation is more sensitive to the variation of SO2, and CO2 purity of separation is more sensitive to the variation of SO2.

Place, publisher, year, edition, pages
2009. Vol. 86, no 2, 202-213 p.
Keyword [en]
Thermodynamic properties, Impurity impacts, Purification, Oxy-fuel, combustion, CO2 capture and storage
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-17907DOI: 10.1016/j.apenergy.2008.05.006ISI: 000260269000011Scopus ID: 2-s2.0-52149108934OAI: oai:DiVA.org:kth-17907DiVA: diva2:335952
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Thermodynamic Properties of CO2 Mixtures and Their Applications in Advanced Power Cycles with CO2 Capture Processes
Open this publication in new window or tab >>Thermodynamic Properties of CO2 Mixtures and Their Applications in Advanced Power Cycles with CO2 Capture Processes
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The thermodynamic properties of CO2-mixtures are essential for the design and operation of CO2 Capture and Storage (CCS) systems. A better understanding of the thermodynamic properties of CO2 mixtures could provide a scientific basis to define a proper guideline of CO2 purity and impure components for the CCS processes according to technical, safety and environmental requirements. However the available accurate experimental data cannot cover the whole operation conditions of CCS processes. In order to overcome the shortage of experimental data, theoretical estimation and modelling are used as a supplemental approach.

 

In this thesis, the available experimental data on the thermodynamic properties of CO2 mixtures were first collected, and their applicability and gaps for theoretical model verification and calibration were also determined according to the required thermodynamic properties and operation conditions of CCS. Then in order to provide recommendations concerning calculation methods for engineering design of CCS, totally eight equations of state (EOS) were evaluated for the calculations about vapour liquid equilibrium (VLE) and density of CO2-mixtures, including N2, O2, SO2, Ar, H2S and CH4.

 

With the identified equations of state, the preliminary assessment of impurity impacts was further conducted regarding the thermodynamic properties of CO2-mixtures and different processes involved in CCS system. Results show that the increment of the mole fraction of non-condensable gases would make purification, compression and condensation more difficult. Comparatively N2 can be separated more easily from the CO2-mixtures than O2 and Ar. And a lower CO2 recovery rate is expected for the physical separation of CO2/N2 under the same separation conditions. In addition, the evaluations about the acceptable concentration of non-condensable impurities show that the transport conditions in vessels are more sensitive to the non-condensable impurities and it requires very low concentration of non-condensable impurities in order to avoid two-phase problems.

 

Meanwhile, the performances of evaporative gas turbine integrated with different CO2 capture technologies were investigated from both technical and economical aspects. It is concluded that the evaporative gas turbine (EvGT) cycle with chemical absorption capture has a smaller penalty on electrical efficiency, while a lower CO2 capture ratio than the EvGT cycle with O2/CO2 recycle combustion capture. Therefore, although EvGT + chemical absorption has a higher annual cost, it has a lower cost of electricity because of its higher efficiency. However considering its lower CO2 capture ratio, EvGT + chemical absorption has a higher cost to avoid 1 ton CO2. In addition the efficiency of EvGT + chemical absorption can be increased by optimizing Water/Air ratio, increasing the operating pressure of stripper and adding a flue gas condenser condensing out the excessive water.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. xii, 63 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:58
Keyword
Thermodynamic property, vapour liquid equilibrium, density, equation of state, interaction parameter, CO2 mixtures, evaporative gas turbine, chemical absorption, oxy-fuel combustion, cost evaluation, CO2 capture and storage
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-9109 (URN)978-91-7415-091-9 (ISBN)
Public defence
2008-10-10, FA32, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100819Available from: 2008-09-26 Created: 2008-09-19 Last updated: 2010-08-19Bibliographically approved

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