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DISSThe PSA DISS Test Facility
Actual Configuration of the PSA DISS Test Facility
550 m
Water
(40 - 108 bar)(30 - 100 bar)
Superheated Steam
0º-2º-4º 0º-2º-4º 0º-2º-4º0º-2º-4º 0º-2º-4º 0º-2º-4º 0º to 8º
25 m
0º-2º-4º0º-2º-4º
B.O.P.
Recirculation
0º
50 mInjectionSystem
0º
Special Test Collector (25 m)
1 2 3 4 5 6 7 8 9 10 11
NorthSouth
AA
Solar Collectors
To be implemented in a next phaseTo be implemented in a next phase
DISS
Aerial View of the PSA DISS Test Facility
The PSA DISS Test Facility
Row of collectors
BOP building
DISSThe PSA DISS Test Facility
Technical Characteristics of the PSA DISS Test Facility
No. of parabolic-trough modules 40Module aperture/length: 5.76 m /12 mNo. of solar collectors 11 Total row length: 550 mInclination of the tracking axis: 0º,2º,4º,6º,8º
Orientation: North-SouthAbsorber pipe inner/outer diameter: 50/70 mmMass flow per row (once-through
configuration) 1 kg/s
Max. recirculation rate: 4Max. outlet steam temperat./pressure: 400ºC/100 bar
DISSThe DISS Project: experimental results
➟ The high pressure/temperature ball joints are performing very well. No problem has been found so far.
➟ The circunferential temperature gradient at the absorber pipes of the boiling section is less than 20ºC for I= 950W/m2 and a flow of 0,8 kg/s, while the temperature gradient at the steam
superheated section is of about 40ºC for a steam flow of 0,5 kg/s (see Results I and II)
➟ The pressure drops at both the boiling and the steam superheating sections in the solar field are much smaller than theoretically predicted by simulation models.
➟ The water recirculation pump has repeatedly failed at high pressures (>60 bar). After one year, the pump manufacturer (National Oil Well) is still trying to solve the problem.
➟ The test facility has been operated for more than 1000 hours. Saturated steam at 100bar and superheated steam at 60bar/375ºC have been produced in Recirculation mode.
➟ The steam pressure at the solar field outlet is rather stable, even with great solar radiation transients (see Results III and IV for 30 and 60 bar)
➟ The new local control unit developed by CIEMAT for sun tracking is performing very well
DISSThe DISS Project: experimental results (I)
09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:300
20406080
100120140160180200
Maximum ∆T allowed
Temperature gradients BOILING SECTION (Collector 5) ∆T SOLDERED Thermocouples (TEMI118D) ∆T NOT SOLDERED Thermocouples (TEMI119D)
∆Tem
pera
ture
(ºC
)
Local time
09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:300
100200300400500600700800900
10001100
Date: 8th June 2000
Direct solar radiation
Sola
r Rad
iatio
n (W
/m2 )
Local time
03691215182124273033
Outlet pressure
Pressure (bar)
0.00.20.40.60.81.01.21.41.61.82.0
Inlet water flow
Flow (kg/s)
DISSThe DISS Project: experimental results (I)
09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:300
20
40
60
80
100
120Changes of valves to put collectors10&11 as Superheating Section
Mixture of water&steam
Maximum ∆T allowed
Temperature gradients SUPERHEATING SECTION (Collector 11) ∆T SOLDERED Thermocouples (TEMI142D) ∆T NOT SOLDERED Thermocouples (TEMI143D)
∆Tem
pera
ture
(ºC
)
Local time
09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:300
100200300400500600700800900
10001100
Date: 8th June 2000
Direct solar radiation
Sola
r Rad
iatio
n (W
/m2 )
Local time
03691215182124273033
Outlet pressure
Pressure (bar)
0.0
0.3
0.6
0.9
1.2
1.5
1.8 Outlet steam flow
Flow (kg/s)
DISSThe DISS Project: experimental results (III)
10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30048
1216202428323640
Outlet pressure
Pres
sure
(bar
)
Local time
0.00.10.20.30.40.50.60.70.80.91.0
Outlet steam flow
Flow (kg/s)
10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:300
100200300400500600700800900
1000Date: 1st June 2000
Direct solar radiationSo
lar R
adia
tion
(W/m
2 )
Local time
DISSThe DISS Project: experimental results (IV)
10:30 11:00 11:30 12:00 12:30 13:00 13:300
10
20
30
40
50
60
70
80 Outlet pressure
Pres
sure
(bar
)
Local time
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Mixture of water and steam
Change of valves to put collectors10 & 11 as Superheating Section
Outlet steam flow
Flow (kg/s)
10:30 11:00 11:30 12:00 12:30 13:00 13:300
100200300400500600700800900
10001100
Date: 9th June 2000
Direct solar radiation
Sola
r Rad
iatio
n (W
/m2 )
Local time
DISSDISS test facility: water recirculation pump
detail of a damaged plunger damaged graphite sealings
DISSThe PSA DISS Test Facility
Ball-joints installed at the DISS collectors
South end pylon
Absorber pipe
North end pylon
Absorber pipe
Mirrors
Mirrors