Environmental Engineering Reference
In-Depth Information
Figure 14.5.2
Schematic of the two configurations for the power section: indirect cycle (left side) and
direct cycle (right side).
Table 14.5.1
Stream properties for two indirect layouts (Giostri et al., 2012).
Synthetic oil (Andasol type)
Molten Salts (Archimede type)
Stream
Fluid type
M [kg/s]
p [bar]
T [
◦
C]
M [kg/s]
p [bar]
T [
◦
C]
1
HTF
725.8
25.0*
308.0
355.9
15.0*
312.7
2
HTF
618.7
17.6
390.0*
296.6
3.7
550.0*
3
Steam
63.5
95*
370.0*
47.1
115.0*
540.0*
4
Steam
51.6
14.5*
370.0*
37.9
14.5*
540.0*
5
Steam
49.1
0.096
45.0*
30.8
0.096
45.0*
6
Steam
2.6
9.2
312.8
1.6
9.2
471.4
7
Water
49.1
8.7*
143.9
36.3
8.7*
143.9
8
Water
63.5
117.6
260.4*
47.1
141.2
278.9*
9
Water
63.5
100
299.5
47.1
120.0
313.4
(*) Assumptions
from piping and absorber thickness; (ii) potential hot spots on the selective coating,
as a consequence of difficult superheater (SH, see below) steam temperature control;
and (iii) the absence of reheating (RH, see below) because of the large volumetric flow,
which would require a great number of parallel absorber tubes. The only operating
plant based on direct cycle configuration is the linear Fresnel collector developed by
Novatec solar; this has a maximum steam temperature of 550
◦
C and no RH (Novatec
Biosol, 2012).
A schematic of the power section for a conventional indirect cycle is given in
Figure 14.5.3. This shows a state-of-the-art power section, where the steam turbine
has both a super-heater and a re-heater and seven regenerative bleedings (including one
for the deareator). This configuration is adopted in most operating plants, including
those of Andasol (
The parabolic trough power plants Andasol 1 to 3
, 2008) and SEGS.
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