Flexible electricity dispatch for CSP plant using un-fired closed air Brayton cycle with particles based thermal energy storage system

Flexible electricity dispatch for CSP plant using un-fired closed air Brayton cycle with particles based thermal energy storage system

This paper presents a novel power block concept for flexible electricity dispatch in a Concentrating Solar Power (CSP) plant. The power block is based on intercooled – unfired regenerative closed air Brayton cycle that is connected to a pressurized solar air receiver. The Closed Brayton cycle uses a...

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Bibliographic Details
Published in:Energy (Oxford) Vol. 173; pp. 971 - 984
Main Authors: Rovense, F., Reyes-Belmonte, M.A., González-Aguilar, J., Amelio, M., Bova, S., Romero, M.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 15-04-2019
Elsevier BV
Subjects:
Brayton cycle
Brayton cycles
CSP
Electric power demand
Electric power generation
Electricity
Energy storage
High temperature
Inlet temperature
Mass flow
Particles storage
Power cycles
Power dispatch
Power plants
Solar power
Thermal energy
Thermodynamics optimization
Turbines
Brayton cycles
Particles storage
CSP
Thermodynamics optimization
Power cycles
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Summary:This paper presents a novel power block concept for flexible electricity dispatch in a Concentrating Solar Power (CSP) plant. The power block is based on intercooled – unfired regenerative closed air Brayton cycle that is connected to a pressurized solar air receiver. The Closed Brayton cycle uses a mass flow regulation system centered on the pressure regulation (auxiliary compressor and bleed valve) in order to control the Turbine Inlet Temperature (TIT). Doing so, the system is able to modulate turbine electricity production according to variations in the solar resource and changes in power electric demand. It has been found that the proposed power block is able to fully cover the electricity demand curve for those days with high solar resource. In case of integrating particles-based high temperature Thermal Energy Storage (TES) system, the power block can extend its production till the next day following the electricity curve demand during summer period. During winter period, the power plant can extend its production for a few hours due to the lower solar resource and the higher electric curve demand load. •Thermodynamics modelling of closed Brayton cycle coupled to CSP plant.•Particles-based Thermal Energy Storage (TES) for CSP.•Flexible operation of power block and storage for electric demand curve supply.•Daily and Annual performance of unfired CSP plant.•Flexible power generation using air receiver.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2019.02.135