Research Papers

A Direct Steam Generation Solar Power Plant With Integrated Thermal Storage

[+] Author and Article Information
Jürgen Birnbaum, Markus Fichtner, Gerhard Zimmermann

 Siemens AG Power Generation, Erlangen 91058, Germany

Markus Eck, Dorothea Lehmann

Institute of Technical Thermodynamics, German Aerospace Center (DLR), Pfaffenwaldring 38-40, Stuttgart 70569, Germany

Tobias Hirsch

Institute of Technical Thermodynamics, German Aerospace Center (DLR), Pfaffenwaldring 38-40, Stuttgart 70569, Germanytobias.hirsch@dlr.de

All pressure values in the text are given as absolute pressure.

J. Sol. Energy Eng 132(3), 031014 (Jun 28, 2010) (5 pages) doi:10.1115/1.4001563 History: Received September 18, 2008; Revised February 19, 2010; Published June 28, 2010; Online June 28, 2010

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 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 analyzed, and boundary conditions arising from the thermal storage system are identified. Compared with a system without storage the number of operating points increases significantly since different combinations of storage charge and discharge operations 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 with parabolic trough fields with a single phase heat transfer medium such as oil, a special heat exchanger configuration is needed for a DSG plant. Different alternatives based on available technologies are presented and evaluated.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 2

Operating modes for the solar field

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Figure 1

Reference plant configuration

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Figure 6

Practical operating point diagram for a plant with thermal storage

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Figure 7

Solar field efficiency at 100 bars/400°C for a system with 50 parallel loops

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Figure 8

Design of a parallel-flow heat exchanger with a minimum temperature difference of 12 K

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Figure 9

Principle layout of the 400°C/110 bars system

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Figure 3

Plant configuration with storage feed-in at thelower pressure stage

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Figure 4

Operating point diagram for a plant without thermal storage

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Figure 5

Theoretical operating point diagram for a plant with thermal storage




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