Spain SolarTres

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Solar Tres Project

Participants:

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Sener

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Boeing

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Saint-Gobain

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CIEMAT

Contact:
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Dale Rogers

Duration:

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December 2002 – June 2006

Funding:  
bulletEU and Spanish Government Grants
bulletPrivate Industry Investors
bulletBank Financing 

Objectives

After the demonstration projects Solar One and Two, Solar Tres is the first commercial project of the Power Tower Technology. The Solar Tres consortium of Spanish, French, Czech Republic and US companies is promoting the 15-MW plant project with a large solar multiple of 3. The project, which has received a subsidy of 5 million Euro from the EC, makes use of the Solar Two technology tested in Barstow (California), but will be approximately three times the size. Solar Tres will make use of several advances in the molten salt technology since Solar Two was designed and built. These include:

bulletA larger plant with a heliostat field approximately three times the size of Solar Two and a improved plant availability with a 6% improvement in overall annual plant efficiency.
bullet2493 glass-metal heliostats (96-m²) with higher-reflectivity glass and because of simplified design 45% reduction in manufacturing costs
bulletA 120 MWt receiver system with higher flux capability and thus lower heat losses which also is immune to stress corrosion cracking; improved reciever thermal efficiency by 3%.
bulletA larger thermal storage system, storing 6,250 MT of molten nitrate salt (16 hours, 600 MWh)
bulletAdvanced pump designs that will pump salt directly from the storage tanks, eliminating the need for pump sumps,
bulletA steam generator system that will have a forced-recirculation steam drum,
bulletA more efficient, higher-pressure reheat turbine, and
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A simplified molten-salt flow loop that reduces 50% of the number of valves. The piping system will be a self-balancing passive design without valves which reduces construction and maintenance costs.

Although the turbine will be only slightly larger than Solar Two’s, the larger heliostat field and thermal storage system will enable the plant to operate 24 hours a day during the summer and have an annual capacity factor of approximately 65%. 

Solar Tres design

Typical Solar Power Tower Flow Schematic

 

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