Moisture Separator Reheater - Balcke-Dürr Energietechnik Gmbh

22 000
7
3
6
Ø 3 200
2
Ø 4 500
Drain pipe
Figure 4. Moisture separator and reheater of the
Unterweser Nuclear Power Plant.
5
1
4
1 Fine separator
2 Coarse separator
3 Reheater
4 Turbine steam inlet
5 Turbine steam outlet
6 Heating steam inlet
7 Heating steam condensate outlet
Condensate outlet nozzle
7
1
2
3
4
5
Agglomerator
6
Moisture Separator Reheaters
1 Agglomerator
2 Manhole
3 1st vortex generator
4 1st drain
5 2nd vortex generator
6 2nd drain
7 HP turbine
8 Moisture separator tank
Figure 3. Moisture separator of the Atucha Nuclear Power Plant.
e finned
e plain
j;
5.0
2.0
1.0
0.5
0.2
0.1
steam condenses in the tubes and is collected
in the lower header or the lower duct and directed
out of the vessel whilst the
turbine steam flows mainly in longitudinal
flow around the bundle and is reheated in the
process.
As a result of the simple and distinct construction,
this type of reheater installed in 10 plants
of which 8 are in operation has functioned
with practically no defects apart from damage
to the guide shell in Unterweser. All reheaters
of the first generation with plain tubes
achieved better heating values than guaranteed
but also higher pressure losses compared
to the design data.
e finned
e plain
NU plain
8
j finned
j plain
NU finned
(apparent)
10
RE comparison
4 2 5 105 2 5 106 0.05
Figure 5. Comparison of the performance figures of fin tube and
plain tube arrangement.
10 3
NU
10 2
5