TWO-YEAR EXPERIENCE IN THE OPERATION OF AN ......F. Kabus, G. Möllmann, F. Hoffmann and J. Bartels...
Transcript of TWO-YEAR EXPERIENCE IN THE OPERATION OF AN ......F. Kabus, G. Möllmann, F. Hoffmann and J. Bartels...
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TWO-YEAR EXPERIENCE IN THE OPERATION OF AN AQUIFER THERMAL ENERGY STORE BASED ON SURPLUS HEAT ARISING FROM A GAS AND STEAM COGENERATION PLANT
AT NEUBRANDENBURG / NE GERMANY
F. Kabus, G. Möllmann, F. Hoffmann and J. BartelsGTN Geothermie Neubrandenburg GmbH, Seestrasse 7A,
17033 Neubrandenburg, [email protected]
The Tenth International Conference on Thermal Energy Storage
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Geothermal heating plant and low-temperaturenetwork(12 MW, 80°C/45°C)
Gas and steamcogeneration plant (77 MW electrical, 90 MW thermal) and high-temperaturenetwork (200 MW, 130°C / 60°C)
ATES at Neubrandenburg
District heat supply by the Neubrandenburg public utilities
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0
20
40
60
80
100
120
0:00 4:00 8:00 12:00 16:00 20:00 0:00
heat
dem
and,
MW
h/h
JanFebJunJulAugDec
surplus heat in summer
shifting of heat
ATES at Neubrandenburg
Characteristics of the heat demand of Neubrandenburg
heat production on maximum load
heat production on minimum load
shifting of heat
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Principle of functioning
ATES at Neubrandenburg
summercharging
winterdischarging
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• Geological formation Upper Postera sandstone
• Depth 1,228 m – 1,268 m
• Reservoirtemperature 55 °C
• Mineralisation 135 g/l
• Porosity 26.6 %
• Permeability 0.94 µm2 – 2.8 µm2
ATES at Neubrandenburg
Parameters of the geothermal resource
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Well construction
ATES at Neubrandenburg
200
300
400
500
600
700
800
900
1000
1200
1300
1100
1400
13 3/4“
5 1/2“ fibre glasspump
9 5/8“
1285 m
4 1/2“ screen
gravel pack
10“ fibre glass
6 5/8“ fibre glass
annulusprotective fluid
Hettangian
Upper Postera
1270 m
7“ fibre glass
7“ liner hanger
warm well cold well
7“ liner hanger
7“ liner
reducer 10” x 6 5/8”with cone 9 5/8”
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cold well warm well
high temperature network
low temperature network
cold well warm well
high temperature network
low temperature network
summer
Functionchart of the aquifer heat store
ATES at Neubrandenburg
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cold well warm well
high temperature network
low temperature network
winter
cold well warm well
high temperature network
low temperature network
Functionchart of the aquifer heat store
ATES at Neubrandenburg
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• Number of wells 2
• Internal distance 1,300 m
• Production and injection flow rate 100 m³/h
• Injection temperature 80 °C
• Discharging temperature (5th year) 78 °C – 72 °C
• Charged heat 12,000 MWh/year
• Discharged heat 8,800 MWh/year
ATES at Neubrandenburg
Operational parameters of the aquifer heat store (acc. to design)
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ATES at Neubrandenburg
0
1,000
2,000
3,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
heat
, MW
h/m
onth
heat from boiler plant
heat from cogeneration plant
heat store
Coverage of the heat demand in the course of the year
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49.7%
50%
heat from cogeneration plant
heat from boiler plant
Percentage demand coverage by the individual heat producers(without the store)
ATES at Neubrandenburg
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49%
3%
48%
heat store
heat from cogeneration plant
heat from boiler plant
Percentage demand coverage by the individual heat producers(acc. to design)
ATES at Neubrandenburg
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ATES at Neubrandenburg
“Cold” well head
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ATES at Neubrandenburg
Heat exchanger between district heat supply network and intermediate loop
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ATES at Neubrandenburg
March 2004:
Start-up of the first heat charging process (Probebetrieb)
December 2004:
Start-up of the first heat discharging process (Probebetrieb)
March 2005:
Start-up of the first regular heat discharging process
November 2005:
Start-up of the first heat discharging process
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Temperatures in the first regular year of charging
ATES at Neubrandenburg
30
40
50
60
70
80
90
D04
J05
F05
M05
A05
M05
J05
J05
A05
S05
O05
N05
D05
J06
F06
M06
tem
pera
ture
[°C
]
First period
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Heating capacity in the first regular year of charging
ATES at Neubrandenburg
-5
-4
-3
-2
-1
0
1
2
3
4
D04
J05
F05
M05
A05
M05
J05
J05
A05
S05
O05
N05
D05
J06
F06
M06
heat
ing
capa
city
out
of t
he a
quife
r (+)
, in
to th
e aq
uife
r (-)
[MW
)
First period
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Store behaviour in the first regular cycle of operation (cumulative)
ATES at Neubrandenburg
-16000
-14000
-12000
-10000
-8000
-6000
-4000
-2000
0
A 05 M 05 J 05 J 05 A 05 S 05 O 05 N 05 D 05 J 06 F 06 M 06
heat
from
and
into
the
aqui
fer [
MW
h]
charging14.225 MWh
discharging6.430 MWh
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Excess heat and its use on 05. and 06.11.2005
ATES at Neubrandenburg
0
1.000
2.000
3.000
4.000
5.000
6.000
7.000
12:00 16:00 20:00 00:00 04:00 08:00 12:00
heat
ing
capa
city
[kW
]
charging heat store
direct heating
excess heat fromcogeneration planttotal network heatdemand
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District heating network and charged heat temperatureson 05. and 06.11.2005
ATES at Neubrandenburg
404550556065707580859095
100
12:00 16:00 20:00 00:00 04:00 08:00 12:00
tem
pera
ture
[°C
]
T feeding flow
T return flow
T injection
T production
cooling down
network
heating up store
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Heat demand coverage on 23. and 24.01.2006
ATES at Neubrandenburg
0
1.000
2.000
3.000
4.000
5.000
6.000
7.000
12:00 16:00 20:00 00:00 04:00 08:00 12:00
heat
ing
capa
city
[kW
]
conventional after-heating
discharging heatstore
total network heatdemand
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District heating network and discharged heat temperatureson 23. and 24.01.2006
ATES at Neubrandenburg
40
45
50
55
60
65
70
75
80
85
90
12:00 16:00 20:00 00:00 04:00 08:00 12:00
tem
pera
ture
[°C
]
T feeding flow
T flow - store
T return flow
T production
T injection
heating up network
cooling down store
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56%
0,4%
44%
heat store
heat from cogeneration plant
heat from boiler plant
ATES at Neubrandenburg
Percentage demand coverage by the individual heat producers(first period)
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This work was financially supported by the Federal Ministry of Economics and Technology of Germany, project no. 0329838B. The authors gratefully acknowledge this support.
ATES at Neubrandenburg