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Zawartość zarchiwizowana w dniu 2022-12-27

MULTIPLE USE OF LOW TEMPERATURE GEOTHERMAL WATER IN ERDING

Cel

The aim of the project is the use of geothermal water for district heating and reclamation of drinking water. The thermal water is produced by a former gas exploration borehole which has been equipped for geothermal water production. The heat requirements are 17 MW with an annual energy amount of 48.300 MWh. The supplied areas are residential areas, recreation areas, a hospital, different schools etc..
For the geothermal heat production, about 552,000 m3 geothermal water, cooled down from 65 deg. C to 17...23 deg. C will be used. The cooling process includes primary heat exchange and cooling work by a heat pump.
By using an two step-absorption heat pump with water-lithiumbromide, the energetic results are as follows :
used geothermal energy : 24,650 MWH/Y
at a maximal flow rate of : 24 kg/s
and a fluid temperature of : 65°C
The use of absorption heat pump is technically feasible. For an high heating efficiency, the heat pump is designed for two-step-operation. In the annual average the efficiency is about 1.70 to 1.00. In peak times the efficiency rises up to about 2.2 to 1.
Compared to conventional supply with use of fossil fuels, an amount of 28,999 MWh/y of fossil energy or 51% will be substituted by the energetical use of the thermal water.
In the next few years, the extracted thermal water (552000 m³/y) will be used as drinking water. In future it will be used as drinking water and as thermal bathing water. The purification of the thermal water will be done by a degassing-plant and a following two-step ozoning and filtration process. The purified thermal water will be mixed with other drinking water in a proportion of max.66.7 to 100 (max.40% share) and fed into the drinking water supply of Erding.
Installation of the former gas exploration borehole with a capacity of about 55 l/s thermal water and a temperature of about 65 deg. C; borehole monitoring; chemical analysis.
INNOVATIVE TECHNOLOGY
* Equipping a former gas exploration borehole for thermal water extraction at a flow rate of in the middle 12 kg/s and a temperature of 65 deg. C.
* Modelling of the hydrodynamic and thermodynamic parameters of the geothermal reservoir * Analysis and technical concepts for the water chemistry (corrosion, precipitations, additional input of protecting gas, degassing)
* very efficient energy production by cooling down the thermal fluid first in a primary heat exchange and then in a two step heat pump
* Contruction of the district heating for low temperature operation (temperature of the returning heating water of new buildings in peak times: 40 deg. C)
* Preparation of the thermal water for the use as drinking water.
CONTEXT :
Heat requirements of the district heating system :
thermal power 17.0 MW
energy amount 48,332 MWH p.y.
Water requirements of the drinking water system in
1993 2,100,000 m3 p.y.
1995 2,600,000 m3 p.y.
2000 3,500,000 m3 p.y.
2010 5,000,000 m3 p.y.
Water and heat requirements of the thermal bath (in 1997)
heat 2.9 MW/9,800 MWh p.y.
water 100,000 m3 p.y.
ECONOMIC ASPECTS :
cost of the investment 24.2 mill DM
1. borehole installation 2.0 mill DM
2. geothermal heating plant 10.9 mill DM
3. boiler for peak production 2.3 mill DM
4. district heating system 9.0 mill DM
Substituted gas and oil (p.y) 28,999 MWh
Value of substituted gas and oil 1,740,000 DM
(price of heat produced by gas and oil: 60 DM/MWh)
Yearly running costs 475,000 DM
EG contribution for the heat pump costs 1.8 mill DM
(10.9 + 2.0-1.8) mill DM
Rebate time : ------------------------- = 8.77 years
(1.74-0.475) mill DM
Costs of geothermal heat production 60 DM/MWh Costsof heat distribution 35 DM/MWh Total heat production and delivering costs 95 DM/MWh

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Koordynator

ZWECKVERBAND FÜR GEOWAERME ERDING
Wkład UE
Brak danych
Adres
LANDSHUTER STRAßE 1
8050 Erding
Niemcy

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