scholarly journals Fluidized particle-in-tube solar receiver and reactor: A versatile concept for particulate calcination and high efficiency thermodynamic cycles

2018 ◽  
Author(s):  
Jack Hoeniges ◽  
Inma Pérez-López ◽  
Hadrien Benoit ◽  
Daniel Gauthier ◽  
Gilles Flamant
Keyword(s):  
High Efficiency ◽  
Thermodynamic Cycles ◽  
Fluidized Particle ◽  
Solar Receiver

scholarly journals Aiming Strategy on a Prototype-Scale Solar Receiver: Coupling of Tabu Search, Ray-Tracing and Thermal Models

2021 ◽  
Vol 13 (7) ◽  
pp. 3920
Author(s):  
Benjamin Grange ◽  
Gilles Flamant
Keyword(s):  
Tabu Search ◽  
Ray Tracing ◽  
Wall Temperature ◽  
Gradual Increase ◽  
Particle Temperature ◽  
Outlet Temperature ◽  
Operation Conditions ◽  
Start Up ◽  
Fluidized Particle ◽  
Solar Receiver

An aiming point strategy applied to a prototype-scale power tower is analyzed in this paper to define the operation conditions and to preserve the lifetime of the solar receiver developed in the framework of the Next-commercial solar power (CSP) H2020 project. This innovative solar receiver involves the fluidized particle-in-tube concept. The aiming solution is compared to the case without the aiming strategy. Due to the complex tubular geometry of the receiver, results of the Tabu search for the aiming point strategy are combined with a ray-tracing software, and these results are then coupled with a simplified thermal model of the receiver to evaluate its performance. Daily and hourly aiming strategies are compared, and different objective normalized flux distributions are applied to quantify their influence on the receiver wall temperature distribution, thermal efficiency and particle outlet temperature. A gradual increase in the solar incident power on the receiver is analyzed in order to keep a uniform outlet particle temperature during the start-up. Results show that a tradeoff must be respected between wall temperature and particle outlet temperature.

scholarly journals Gas-Solid Flow in a Fluidized-Particle Tubular Solar Receiver: Off-Sun Experimental Flow Regimes Characterization

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7392
Author(s):  
Ronny Gueguen ◽  
Guillaume Sahuquet ◽  
Samuel Mer ◽  
Adrien Toutant ◽  
Françoise Bataille ◽  
...  
Keyword(s):  
Acquisition Time ◽  
Internal Diameter ◽  
Short Acquisition Time ◽  
Wide Range ◽  
Temporal Pressure ◽  
Secondary Air ◽  
Fluidized Particle ◽  
Solar Power Tower ◽  
Fluidized Particles ◽  
Solar Receiver

The fluidized particle-in-tube solar receiver concept is promoted as an attractive solution for heating particles at high temperature in the context of the next generation of solar power tower. Similar to most existing central solar receivers, the irradiated part of the system, the absorber, is composed of tubes in which circulate the fluidized particles. In this concept, the bottom tip of the tubes is immersed in a fluidized bed generated in a vessel named the dispenser. A secondary air injection, called aeration, is added at the bottom of the tube to stabilize the flow. Contrary to risers, the particle mass flow rate is controlled by a combination of the overpressure in the dispenser and the aeration air velocity in the tube. This is an originality of the system that justifies a specific study of the fluidization regimes in a wide range of operating parameters. Moreover, due to the high value of the aspect ratio, the particle flow structure varies along the tube. Experiments were conducted with Geldart Group A particles at ambient temperature with a 0.045 m internal diameter and 3 m long tube. Various temporal pressure signal processing methods, applied in the case of classical risers, are applied. Over a short acquisition time, a cross-reference of the results is necessary to identify and characterize the fluidization regimes. Bubbling, slugging, turbulent and fast fluidization regimes are encountered and the two operation modes, without and with particle circulation, are compared.

A prototype receiver for medium temperature conversion of solar radiation to heat

2011 ◽  
Vol 225 (8) ◽  
pp. 1111-1119 ◽  
Author(s):  
V Stefanović ◽  
M Bojić ◽  
S Pavlović ◽  
N Apostolović ◽  
I Nikolić ◽  
...  
Keyword(s):  
Solar Radiation ◽  
High Efficiency ◽  
Electric Energy ◽  
Glass Tube ◽  
Diffuse Radiation ◽  
Long Distance ◽  
Medium Temperature ◽  
Circular Arcs ◽  
Thermal Measurements ◽  
Solar Receiver

In this article, a solar receiver prototype (marked as P2CC, parabolic-and-circular collector) is described for medium temperature conversion of solar radiation in heat. The investigated concentrator has a tubular receiver and two identical reflectors, one from each side of the tubular receiver. The tubular receiver is a concentric tube consisting of a metal tube (absorber) inside the glass tube. Each reflector curve is defined using three curves where one curve is parabola and two curves are circular arcs. The demonstrated prototype has the reception angle of 110° at concentration ratio CR = 1.38, with the significant reception of diffuse radiation. The hydraulic measurements reveal the pressure drop up to 200 Pa. Thermal measurements discover the high efficiency of the P2CC of up to 75 per cent. The prototype application would mean significant savings of electric energy which is now used for preparation of warm water, and in central and long-distance heating systems.

The Optimization of Hydrogen Oxygen Cycles

2020 ◽  
Author(s):  
Bram Schouten ◽  
Sikke Klein
Keyword(s):  
Fuel Cells ◽  
Energy Storage ◽  
High Efficiency ◽  
Solar Power ◽  
Rankine Cycle ◽  
Brayton Cycle ◽  
Thermodynamic Cycles ◽  
Renewable Power ◽  
Excess Power ◽  
Power Shortages

Abstract Todays renewables, wind and solar power, have a fluctuating nature, making the grid less stable. However, with the increasing share of intermittent sources of renewable power, novel options have to be created to stabilize the power grid. One of these options is energy storage via the conversion of excess power to hydrogen during periods of high generation from wind and/or solar. In periods of power shortages hydrogen is converted back to power. In this work, a number of high efficiency thermodynamic cycles, based upon the Graz cycle and the Toshiba Reheat Rankine cycle, both a coupled closed Brayton cycle with a Rankine cycle, are investigated and improvements are proposed leading to LHV efficiencies of 75%. Also the addition of fuel cells to the cycles is studied leading to potential LHV efficiencies of 85%. Application of pressurized H2/O2 usage leads to several improvements over conventional thermodynamic cycles and conventional fuel cells.

High-Efficiency Low-Cost Solar Receiver for Use Ina a Supercritical CO2 Recompression Cycle

2016 ◽  
Author(s):  
Shaun D. Sullivan ◽  
James Kesseli ◽  
James Nash ◽  
Jason Farias ◽  
Devon Kesseli ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Solar Receiver ◽  
Recompression Cycle

Development of a solar receiver for a high-efficiency thermionic/thermoelectric conversion system

Solar Energy ◽  
1996 ◽  
Vol 58 (4-6) ◽  
pp. 191-195 ◽  
Author(s):  
H. Naito ◽  
Y. Kohsaka ◽  
D. Cooke ◽  
H. Arashi
Keyword(s):  
High Efficiency ◽  
Thermoelectric Conversion ◽  
Conversion System ◽  
Solar Receiver

scholarly journals Full Spectrum Solar System: Hybrid Concentrated Photovoltaic/Concentrated Solar Power (CPV-CSP)

MRS Advances ◽  
2016 ◽  
Vol 1 (43) ◽  
pp. 2941-2946 ◽  
Author(s):  
David Cygan ◽  
Hamid Abbasi ◽  
Aleksandr Kozlov ◽  
Joseph Pondo ◽  
Roland Winston ◽  
...  
Keyword(s):  
Molten Salt ◽  
High Efficiency ◽  
Low Cost ◽  
Optical Element ◽  
Temperature Limit ◽  
Full Spectrum ◽  
Industrial Facilities ◽  
Double Junction ◽  
Technology Institute ◽  
Solar Receiver

ABSTRACTGas Technology Institute (GTI), together with its partners University of California at Merced (UC Merced) and MicroLink Devices Inc. (MicroLink) are developing a full spectrum solar energy collection system to deliver variable electricity and on-demand heat. The technology uses secondary optics in a solar receiver to achieve high efficiency at high temperature, collects heat in particles for low fire danger, stores heat in particles instead of molten salt for low cost, and uses double junction (2J) photovoltaic (PV) cells with backside infrared (IR) reflectors on the secondary optical element to raise exergy efficiency. The overall goal is to deliver enhancement to established trough technology while exceeding the heliostat power tower molten salt temperature limit. The use of inert particles for heat transfer may make parabolic troughs safer near population centers and may be valuable for industrial facilities.

scholarly journals Thermal analysis of fluidized particle flows in a finned tube solar receiver

Solar Energy ◽  
2019 ◽  
Vol 191 ◽  
pp. 19-33 ◽  
Author(s):  
A. Le Gal ◽  
B. Grange ◽  
M. Tessonneaud ◽  
A. Perez ◽  
C. Escape ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Finned Tube ◽  
Particle Flows ◽  
Fluidized Particle ◽  
Solar Receiver

scholarly journals High-Temperature Receiver Designs for Supercritical CO2 Closed-Loop Brayton Cycles

2014 ◽  
Author(s):  
C. K. Ho ◽  
T. Conboy ◽  
J. Ortega ◽  
S. Afrin ◽  
A. Gray ◽  
...  
Keyword(s):  
High Temperature ◽  
Supercritical Co2 ◽  
Closed Loop ◽  
High Efficiency ◽  
Power Cycles ◽  
Advantages And Disadvantages ◽  
Solar Powered ◽  
Solar Receiver ◽  
Alternative Designs ◽  
Indirect Heating

High-temperature receiver designs for solar powered supercritical CO2 Brayton cycles that can produce ∼1 MW of electricity are being investigated. Advantages of a supercritical CO2 closed-loop Brayton cycle with recuperation include high efficiency (∼50%) and a small footprint relative to equivalent systems employing steam Rankine power cycles. Heating for the supercritical CO2 system occurs in a high-temperature solar receiver that can produce temperatures of at least 700 °C. Depending on whether the CO2 is heated directly or indirectly, the receiver may need to withstand pressures up to 20 MPa (200 bar). This paper reviews several high-temperature receiver designs that have been investigated as part of the SERIIUS program. Designs for direct heating of CO2 include volumetric receivers and tubular receivers, while designs for indirect heating include volumetric air receivers, molten-salt and liquid-metal tubular receivers, and falling particle receivers. Indirect receiver designs also allow storage of thermal energy for dispatchable electricity generation. Advantages and disadvantages of alternative designs are presented. Current results show that the most viable options include tubular receiver designs for direct and indirect heating of CO2 and falling particle receiver designs for indirect heating and storage.

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