The aim of the project has been to evaluate the market potential for oxyfuel technology and its produced CO2 – as well as to assess the technical and economic performance of an oxyfuel turbine. Furthermore, the project was to prepare a pilot scale demonstration of oxyfuel technology in a gas turbine. This project has been the first phase in the plans for a full-scale demonstration of oxyfuel technology in a gas turbine (3 phases).
In the first part of the project, an optimized oxyfuel cycle was chosen for further concept studies, this had an efficiency of 47% (including CO2 compression and O2 production). This has formed the basis for cost estimates of a 125 MW power plant with CO2 capture.
The largest part of the project has focused on demonstration of an combustion system for oxyfuel combustion in a gas turbine, this has included detailed concept and design studies and a dedicated burner has been built (at Siemens) for experimental studies of a final concept. This has been tested at SINTEF Energi in three test campaigns focusing on mapping stability areas for such a burner that will be operated in such an oxyfuel cycle where nitrogen is replaced with CO2. Testing has first been carried out at atmospheric environments and further with pressurization up to 4.2 bar – and at these environments complete operation maps for the burner have been specified. At Siemens, material tests have also been carried out with a focus on operation and operation in oxyfuel environments, how selected materials will be affected in pressurized conditions and exposed to other components / molecules than in “normal” gas turbine operation.
In summary, a test site for the next phase has been proposed; at Lund University where a Turbec T100 gas turbine has been installed. Costs and measures related to the design and adaptation of this for pilot scale demonstration of a complete oxyfuel cycle have been reported