Solar thermal power plants - Otto von Guericke University … · 2017-01-02 · Solar thermal power...
Transcript of Solar thermal power plants - Otto von Guericke University … · 2017-01-02 · Solar thermal power...
1Industrial energy management
Industrial energy management
Solar thermal power plants
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Theory solar radiationfinite distance between earth and sun
so sunlight is not parallel Sonnenlicht nicht parallel but divergent
geometrical circumference in about 4,65 mrad
sun is not a Lambert emitter because intensity decreases at boundary
from this followes: Sunshape:re
lativ
e ra
diat
ion
ener
gyde
nsity
deviation from solar altitude
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simplification:
imittance without losses at surface (Solar
constant 1367 W/m2)
reduced by: steam, dust…
Theory solar radiation
wave length /nm
spec
tral
irrad
iatio
n/ W
/m² n
m
wave lenght and application
spectral distribution at outerspace
black body at5762K
spectral distribution at sealevel (clear sky)
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categorisation of solar thermal power plants
tower farm
Tower -characteristics- Farmcentral -absorber config.- peripheraloptical -energy transport- thermical500-1200°C -temperature - 100-400°C5-100MW -power- 50kW-50MW400-1000 -concentration- 30-85
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scheme farm power plant at Cramer Junction Iparabolic trough, line focus 14MW
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scheme farm power plant: heat storage
heat storage with sensible heat: concrete, molten saltlatent heat: steam, liquified material (salt)
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parabolic trough solar thermal power plantAndasol 1(50MW) pic. by Solarmillenium (Spain)
http://commons.wikimedia.org/wiki/File:12-05-08_AS1.JPG
2013: Shams solar power station with100 MW (Abu Dhabi)
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Parabolic Trough, DLR(german airspace centre )
concentration: 82
mirrorflexible tubes
servodrive
expan-sionloop
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Fresnel mirror DLR/Solar Power Group
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absorbtion tube by Schott Solar / DLR
absorbtion tube, a selective emitter
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• State of the art: heat transfer oil, ϑmax=320°C, at higher Temp.
thermal cracking, under pressure up to 400°C; production of H2 and reduction of vacuum
• future: solar boiling at pmax 10MPa and ϑmax=320°C, dificulties:piping and flow pattern
heat carrier fluids in farm power palnts
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Eurodish Almeria DLRStirling engine!
Spot focus systems
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Spot focus systems: solar tower power plant
principle: individual biaxial adjustable mirros (Heliostates)reflects the sunlight to a focal spot
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• concentrated solar radiation 0,3-1MW/m²
• enable max. temperature > 1000°C
solar tower, heat carrier fluids
closed voluetric receiver:under pressure with, He…to drive a: Joule/Brayton- cycle
gas as a carrier:porous absorber!
open volumetric receiver:simple designsucks in ambient air,complete ceramical contruction,ϑmax up to 1000°C
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solar tower, closed cycle:Testbed Almeria (Spain) DLR 500kw Turbine
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solar tower, offen: Jülich DLR 1,5 MWel
receiver: Siliciumcarbite SiC, as monolith with parallel channels
heat storage: sand up to 1h full loadperformance
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liquified metal: sodium, SSPS, 1981, 0,5MW
molten salt: nitrate salt, Solar Two, 1996, 10MW
water: PS 10/PS 20, 2007/ 2009, 10/20MW
solartower, heat carrier fluids for tube receiver
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solar tower, tube receiver: PS 10 Sevilla
193011.2012ISUT-Seminar Jörg Sauerhering
Thanks for your attention!
sources: Solarthermische HochtemperatursystemeR. Stieglitz, V. Heinzel; Springer-VerlagHandbuchreihe Energie Bd. 13D. Bonnet, Techn. Verlag ReschDLR; Stuttgart, Köln; R. Pitz-Paal, P. Schwarzbözl, R. Tamme