Simulation and comparison between fixed and sliding-pressure strategies in parabolic-trough solar power plants with direct steam generation

2017 ◽  
Vol 125 ◽  
pp. 735-745 ◽  
Author(s):  
Mario Biencinto ◽  
María José Montes ◽  
Loreto Valenzuela ◽  
Lourdes González
Keyword(s):  
Power Plants ◽  
Solar Power ◽  
Steam Generation ◽  
Parabolic Trough ◽  
Direct Steam ◽  
Solar Power Plants ◽  
Sliding Pressure

Model and control scheme for recirculation mode direct steam generation parabolic trough solar power plants

2017 ◽  
Vol 202 ◽  
pp. 700-714 ◽  
Author(s):  
Su Guo ◽  
Deyou Liu ◽  
Xingying Chen ◽  
Yinghao Chu ◽  
Chang Xu ◽  
...  
Keyword(s):  
Power Plants ◽  
Solar Power ◽  
Steam Generation ◽  
Parabolic Trough ◽  
Control Scheme ◽  
Direct Steam ◽  
Solar Power Plants ◽  
And Control

scholarly journals Modeling of Direct Steam Generation in Concentrating Solar Power Plants

2016 ◽  
Vol 101 ◽  
pp. 464-471 ◽  
Author(s):  
S. Ravelli ◽  
G. Franchini ◽  
A. Perdichizzi ◽  
S. Rinaldi ◽  
V.E. Valcarenghi
Keyword(s):  
Power Plants ◽  
Solar Power ◽  
Steam Generation ◽  
Concentrating Solar Power ◽  
Direct Steam ◽  
Solar Power Plants

Direct Steam Generation in Parabolic Trough Solar Power Plants: Numerical Investigation of the Transients and the Control of a Once-Through System

1996 ◽  
Vol 118 (1) ◽  
pp. 9-14 ◽  
Author(s):  
F. Lippke
Keyword(s):  
Power Plants ◽  
Weather Conditions ◽  
Future Generation ◽  
Numerical Approach ◽  
Steam Generation ◽  
Dynamic Reaction ◽  
Parabolic Trough ◽  
Water Steam ◽  
Direct Steam ◽  
Solar Power Plants

Direct steam generation (DSG) in parabolic troughs was first studied in the early 1980s by Murphy (1982) and Pederson (1982). Intensive research on DSG then started in 1988, when Luz identified this technology as the desired system for a future generation of its power plants. These R&D activities were not terminated on Luz’s demise in 1991, but have been continued by several institutes and companies in Europe as well as in Israel (Dagan et al., 1991, Mu¨ller et al., 1992a, b, 1993, 1994). This paper concerns the dynamic reaction of the water-steam flow. In order to investigate this, a numerical simulation program was developed at the ZSW. The numerical approach, its verification, and results of an extended study concerning the reaction and the control (ability) of a once-through DSG system at different weather conditions are presented.

Optical Analysis of a Two Stage XX Simultaneous Multiple Surface Concentrator for Parametric Trough Primary and Flat Absorber With Application in Direct Steam Generation Solar Thermal Plants

2016 ◽  
Vol 138 (2) ◽  
Author(s):  
Juan Pablo Núnez Bootello ◽  
Henry Price ◽  
Manuel Silva Pérez ◽  
Manuel Doblaré Castellano
Keyword(s):  
Concentration Ratio ◽  
Power Plants ◽  
Steam Generation ◽  
Tracking Accuracy ◽  
Parabolic Trough ◽  
Acceptance Angle ◽  
Direct Steam ◽  
Solar Power Plants ◽  
Well Differentiated

Today most commercial parabolic trough collector (PTC) solar power plants make use of the well-known LS3/Eurotrough optics. The PTC has a concentration ratio relative to the maximum thermodynamic limit equal to 0.31. In order to improve the competiveness of PTC technology, two well differentiated R&D strategies have been undertaken: (i) developing larger parabolic troughs, which places a higher demand in tracking accuracy and lower tolerances with respect to wind loads, quality of mirrors, control and assembly imprecisions, and (ii) developing secondary concentrators with the aim of bringing the concentration ratio relative to the maximum one as close to 1 as possible. In this paper, a parametric trough collector (PmTC) for a flat receiver designed with the simultaneous multiple surface (SMS) method is proposed. The method assumes zero transmission, absorption, and reflection optical losses and allows for both reflective primary and secondary surfaces (XX-reflective plus reflective) to be simultaneously designed, guaranteeing Etendue matching. The proposed PmTC geometry increases the referred ratio up to 0.59 with a rim angle greater than 100 deg and with the same effective acceptance angle as the PTC. The flat absorber can be replaced with a multitube receiver for application in direct steam generation (DSG).

Analysis of Operation Test Results of a High Temperature Phase Change Storage for Parabolic Trough Power Plants With Direct Steam Generation

2012 ◽  
Author(s):  
Doerte Laing ◽  
Markus Eck ◽  
Matthias Hempel ◽  
Wolf-Dieter Steinmann ◽  
Mirko Meyer-Grünefeldt ◽  
...  
Keyword(s):  
Phase Change ◽  
Power Plants ◽  
Natural Circulation ◽  
Heat Transfer Fluid ◽  
Test Results ◽  
Steam Generation ◽  
Parabolic Trough ◽  
Two Phase ◽  
Direct Steam ◽  
Sliding Pressure

For future parabolic trough plants direct steam generation in the receiver pipes is a promising option for reducing the costs of solar thermal energy [1]. These new solar thermal power plants require innovative storage concepts, where the two phase heat transfer fluid poses a major challenge [2]. For the regions where the heat transfer fluid is in a single phase (water or steam), sensible heat storage using molten salt [3] or concrete [4] as storage material can be applied. However, efficient energy storage in the two-phase evaporation/condensation region requires heat storage operation within a narrow temperature range. For this two phase region, a high performance PCM storage technology was developed and demonstrated by DLR. A test module using 14 tons of PCM with 700 kWh capacity was built in 2009 and commissioned in 2010 in a direct steam test loop, set up at the power plant Litoral of Endesa in Carboneras, Spain [5]. The PCM-storage uses Sodium nitrate as phase change material with a melting temperature of 305 °C. Cycle testing has started end of 2010. Cycling tests have proven the expected discharge capacity of approx. 700 kWh for the PCM-storage module. System operation in constant pressure mode and sliding pressure mode has been conducted for the PCM-storage. While in the constant pressure mode a peak performance of the storage of more than 700 kW could be demonstrated, in the sliding pressure mode a constant power output over almost the whole charge and discharge period could be provided. The paper discusses the test results and evaluation for different operation modes for the phase change storage for discharge operation. Charging of the phase change storage is always in a once-through mode. However, for discharge, the steam can be generated either in forced or natural circulation mode or in once-through mode, leading to very different effects for the two-phase flow and filling level inside the heat exchanger pipes in the storage. The effects for forced and natural circulation discharge will be analysed and described in the paper.

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