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Clean Air: International Journal on Energy for a Clean Environment

ISSN for PRINT: 1561-4417

Institutional price:	$451.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2007, Volume8

105 pages

DOI: 10.1615/InterJEnerCleanEnv.v8.i3

Issue price - $128.00

OXYFUEL PROCESS FOR HARD-COAL POWER PLANTS WITH CO₂ REMOVAL

A. Kather
Institute of Energy Systems, Hamburg University of Technology, Denickestr. 15, D-21073 Hamburg, Germany

K. Mieske
Institute of Energy Systems, Hamburg University of Technology, Denickestr. 15, D-21073 Hamburg, Germany

C. Hermsdorf
Institute of Energy Systems, Hamburg University of Technology, Denickestr. 15, D-21073 Hamburg, Germany

M. Klostermann
Institute of Energy Systems, Hamburg University of Technology, Denickestr. 15, D-21073 Hamburg, Germany

R. Eggers
Institute of Thermal and Separation Processes, Hamburg University of Technology, Eissendorfer Str. 38, D-21073 Hamburg, Germany

D. Kopke
Institute of Thermal and Separation Processes, Hamburg University of Technology, Eissendorfer Str. 38, D-21073 Hamburg, Germany

ABSTRACT

The Oxyfuel process is one of the promising options for carbon capture and storage from fossil fuel power plants. It is based on the approved steam power process and therefore will profit from its high reliability and efficiency. The Oxyfuel process proposes the combustion of coal in an atmosphere of oxygen and recirculated flue gas, and will provide a flue gas containing up to 90 vol % of CO₂. By means of a cryogenic liquefaction, a CO₂ stream with a purity of almost 99% can be obtained. However, the implementation of the Oxyfuel process and other CCS technologies is dependent on legal matters concerning the amount of impurities allowed for the storage sites. The additional units, such as the air separation unit and the CO₂ separation plant, will have a considerable power demand, leading to an efficiency drop of more than ten percentage points. This efficiency loss can be reduced to approximately eight percentage points by an optimized process leading to a net electrical efficiency of 38% compared to the reference plant with 46%.