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Modelling and control of a solar-thermal parabolic trough DSG superheater with several parallel rows and central steam separation

Koch, Stephan and Hirsch, Tobias and Eck, Markus (2007) Modelling and control of a solar-thermal parabolic trough DSG superheater with several parallel rows and central steam separation. Energy Sustainability 2007 (ES2007), 2007-06-27 - 2007-06-30, Long Beach, CA (USA). ISBN 0-7918-3798-X.

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Abstract

ABSTRACT In this paper, a solar-thermal parabolic trough power plant with direct steam generation (DSG) is investigated with respect to the controllability of the superheating section in a commercialscale facility with several parallel collector rows. The plant is operated in recirculation mode which has been proven to provide a good live steam quality under changing operating conditions in single-row systems. In a multiple-row collector field, the separation of the remaining water at the end of the evaporator can be achieved by using one central or several distributed separators. Central separation, which will be investigated in this work, appears to be the superior concept. The article proposes a decentralized adaptive proportionalintegral (PI) control approach together with a static output mapping for the control valves at the end of the superheating section. The section is fed by a single saturated steam mass flow which has to be distributed on the parallel superheater rows. Together with the individually controlled injection coolers in each row, the distribution control enables the solar field to provide the power block with a reliable steam temperature in the presence of significant local irradiance and input mass flow transients induced by varying solar intensity during the day and passing clouds.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Modelling and control of a solar-thermal parabolic trough DSG superheater with several parallel rows and central steam separation
Authors:
AuthorsInstitution or Email of Authors
Koch, StephanUNSPECIFIED
Hirsch, TobiasUNSPECIFIED
Eck, MarkusUNSPECIFIED
Date:30 June 2007
Refereed publication:Yes
In ISI Web of Science:No
Editors:
EditorsEmail
ASME, UNSPECIFIED
ISBN:0-7918-3798-X
Status:Published
Keywords:Parabolrinne, Direktverdampfung, Parallele Stränge, zentrale Abscheidung, adaptive Regelung, Überhitzer, parabolic trough, direct steam generation, superheater, parallel rows, central separation, adaptive control
Event Title:Energy Sustainability 2007 (ES2007)
Event Location:Long Beach, CA (USA)
Event Type:international Conference
Event Dates:2007-06-27 - 2007-06-30
Organizer:ASME
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 Technical Thermodynamics > Solar Research
Deposited By: Dr.-Ing. Tobias Hirsch
Deposited On:28 Aug 2007
Last Modified:12 Dec 2013 20:27

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