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Design of a phase separation system for a Direct Steam Generation Parabolic Trough Collector Field

Hirsch, Tobias and Eck, Markus (2008) Design of a phase separation system for a Direct Steam Generation Parabolic Trough Collector Field. Journal of Solar Energy Engineering, 130 (1), 011003-1. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.2804621 ISSN 0199-6231

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The direct steam generation in parabolic troughs is a promising option to further reduce levelised electricity costs of solar thermal power plants. The operation of the field in recirculation mode offers advantages concerning the control and stability of the system. Due to the large dimensions of the field compact phase separators installed in each collector row are discussed as an alternative to a central drum-type separation vessel. This paper deals with the design of a distributed phase separation system composed of the separation devices themselves and a common drainage line to the central buffer tank. As a reference configuration for this analysis the collector field developed within the INDITEP project is chosen. In a first step transient numerical simulation of the collector loop is used to define the loads on the separation system especially under transient conditions caused by cloud coverage. It is found that peak liquid flow rates can exceed the steady-state values by a factor of 10. Based on these results a model for the required separation efficiency is suggested and the drainage system is dimensioned. In order to guarantee sufficient draining even under transient conditions the separators have to be equipped with additional buffer volumes. Finally the distributed separation system is compared to the configuration with a central buffer tank considering the criteria materials consumption, thermal inertia, parasitic losses and controllability. The results of the presented analysis are of vital importance for the layout of future DSG-collector fields.

Item URL in elib:https://elib.dlr.de/21701/
Document Type:Article
Title:Design of a phase separation system for a Direct Steam Generation Parabolic Trough Collector Field
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:February 2008
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1115/1.2804621
Page Range:011003-1
Publisher:American Society of Mechanical Engineers (ASME)
Series Name:Transactions of the ASME
Keywords:phase separation system, direct steam generation, recirculation mode, concentrating solar energy
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Applikationsentwicklung (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Solar Research
Deposited By: Hirsch, Dr.-Ing. Tobias
Deposited On:10 Jun 2008
Last Modified:08 Mar 2018 18:45

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