具有集成热储存功能的直接蒸汽发电太阳能发电厂A DIRECT STEAM GENERATION SOLAR POWER PLANT WITH INTEGRATED THERMAL STORAGE.pdfVIP

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具有集成热储存功能的直接蒸汽发电太阳能发电厂A DIRECT STEAM GENERATION SOLAR POWER PLANT WITH INTEGRATED THERMAL STORAGE.pdf

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A DIRECT STEAM GENERATION SOLAR POWER PLANT WITH INTEGRATED THERMAL STORAGE 1 2 1 2 Jürgen Birnbaum , Markus Eck , Markus Fichtner , Tobias Hirsch , 2 1 Dorothea Lehmann , Gerhard Zimmermann 1 Siemens Power Generation, Erlangen (Germany) 2 German Aerospace Center (DLR), Institute of Technical Thermodynamics, Stuttgart (Germany) Tobias Hirsch, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany, tobias.hirsch@dlr.de Abstract For the future market potential of parabolic trough power plants with direct steam generation (DSG) it is beneficial to integrate a thermal storage system. Heat storage media based on phase change materials (PCM) offer heat transfer at constant temperatures needed for the evaporation process. Different options for a plant layout are presented and discussed. The interactions between the three subsystems solar field, power block and thermal storage are analysed and boundary conditions arising from the thermal storage system are identified. Compared to a system without storage the number of operating points increases significantly since different combinations of storage charge and discharge operation go along with a varying power output of the solar field. It is shown that the large number of theoretical operating points can be reduced to a subset with practical relevance. Depending on the live steam parameters a reheat is necessary within the power block. Compared to