|The CCS demonstration project Jänschwalde is the link between the pilot plant and the commercial concept that is to be developed. In the demonstration plant, the technology’s commercial abilities will be proven whereas in the pilot plant the technology itself and the process are validated. The power plant Jänschwalde was chosen as the demonstration site, because it is a completely permitted power plant in full operation with ample lignite resources in proximity.
The power plant Jänschwalde is located in Germany in the state of Brandenburg, approximately 120 km southeast of Berlin, not far from the town of Peitz. The facility was constructed unit-wise between 1976 and 1988 and was subsequently retrofitted between 1991 and 1996. Next to Unit F, to the east and the north, there is an area available that is suitable for the construction of larger facilities.
The combination of two different CO2 capture technologies (Oxyfuel and PCC) allows both technologies to be demonstrated and developed for commercial application. A feasibility study investigated both the concept and design of the PCC & the Oxyfuel process at demonstration scale, as well as the integration of necessary components into the existing power plant site at Jänschwalde. Both techniques were considered from a thermo-dynamic point of view, as well as regarding arrangement and integration into the complete cycle.
Oxyfuel technology was chosen on account of its potential to obtain high efficiency rates when applied to newly built power plants, as well as its superior capture rate as compared to PCC and IGCC technology options. Moreover, Oxyfuel technology shows a comparable process flow to conventional power plants with respect to boiler, dust removal, flue gas treatment. The extremely positive results seen at the Vattenfall Oxyfuel pilot plant at Schwarze Pumpe in combination with the resulting expertise invested in highly advanced personnel training will be transferred to operations at the Jänschwalde demonstration plant. This experience provides a strong argument for the continued selection of Oxyfuel technology.
The rationale behind PCC is that it is the best option to retrofit existing power plants, and therefore worthwhile for study and demonstration.
The Oxyfuel part of the Demo plant will have an installed capacity of 250MW while the PCC part will capture CO2 equaling 50MW. All in all, 1,7 million tons of CO2 shall be captured and stored underground each year.
Integrating two capture technologies in one demonstration plant will increase the complexity of the project, but will also deliver more important results regarding future commercial implementation of CCS. Also, the commercial phase will require the retrofit of existing power plants with post-combustion technology, at the same time constructing new power plants/units which use other capture technology options (e.g. Oxyfuel) at the same location. A big commercial advantage would exist if both technologies could use the same CO2 transport and storage infrastructure. This project will deliver the answers to these important questions.