PEGASUS will investigate a novel power cycle for renewable electricity production combining a solar centrifugal particle receiver with a sulphur storage system for baseload operation. The proposed process combines streams of solid particles as heat transfer fluid that can also be used for direct thermal energy storage, with indirect thermochemical storage of solar energy in solid sulphur, rendering thus a solar power plant capable of round-the-clock renewable electricity production.
Process scheme of the solar sulphur cycle / Image source: DLR
The overall objective of PEGASUS is the development and demonstration of an innovative solar tower system based on solid particles combined with a novel thermochemical solar energy storage technology based on elemental sulphur, to achieve dispatchable and firm renewable electricity generation with a significant cost reduction with respect to current state-of-the-art concepts. The technology will be validated under real on- sun concentrated solar irradiation in the Solar Tower Jülich (STJ) thermal plant in Germany owned by the Project Coordinator, DLR.
In this perspective, the project’s specific Technical Objectives of KIT are:
To develop and realize a novel lab-scale sulphur burner able to modulate in a range of 10-50 kW with quantitative targets: sulphur combustion with >99 % combustion efficiency at power densities > 1,5 MW/m3 under atmospheric conditions (3 times higher than conventional sulphur combustion chambers) and flame temperatures > 1400 °C.
To demonstrate the feasibility of the over-all proposed process, draft the complete flowsheet and analysis of optimized integrated process scaled-up to the 5MWth power level, assess the technology vs. the targets set.
More information is published in a press-release of KIT and on the public website of the project (link below)