VGB POWERTECH 10 (2019)

A
VGB
journey
PowerTech
through
1/2
100
l 2013
years VGB | VGB POWERTECH 1/2 (2013)
Heat storage systems
steam
destrict heat supply line
heater
location for
heat storage tank
Fig. 14. Location of the GKM heat storage
system.
an equal amount of “cold” water is taken
from the return-flow line and is fed into the
storage tank. If necessary, a heater is used
for heating up the hot water extracted, up
to flow temperatures of > 100 °C (e.g. in
winter time), as required for the districtheat
storage tank
98°C
bäck” (i.e. a flat-bottom tank with special
built-in components for charging and discharging;
a stratified storage tank (“cold”
at the bottom and “hot” at the top) without
a partitioning membrane). The pressure
present in the district-heating water
network is used for charging the storage
tank via appropriate control valves (in the
condensate
Fig. 12. Process flow diagram of the GKM water heat storage system.
destrict heat return line
return-flow and supply lines) by using the
hot supply-line water of the district-heat
system. Discharging of the storage tank is
effected by using the discharge pumps in
the return-flow line (cold) and in the supply
line (hot), with the water being discharged
into the supply line of the districtheating
water network. For this purpose,
Table 3. Data of the GKM heat storage system.
Diameter tank
Cylindric height tank
40 m
36 m
Storage capacity 43,000 m 3
Max. flow to/from tank
6,200 t/h
Storage water temperature 98 °C
Effective heat storage capacity
Max. load
1,500 MWh
250 MW
20 bar/300°C
Steam manifold
20 bar/530°C
G ND 1-3 MD HD
heat
storage
M20 G M21 G
98°C
500 MW th
unit 9
232 MW th 232 MW th
M20
232 MW th 300 MW th
M21
Plinaustraße
Aufeldstr.
Marguerrestr.
Altriperstr.
Angelstr.
Belfortstr.
line HD
Rhenania
straße
line Mannheim
west
DN 800 DN 1000
line Mannheim
north
Fig. 13. Heat storage system in the district-heat generation facilities of the GKM plant.
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