Skip to main content
European Commission logo print header
Inhalt archiviert am 2022-12-27

MODERNIZATION OF THE WAREN-PAPENBERG GEOTHERMAL HEATING PLANT

Ziel

The geothermal heating plant is in operation since 1984. It provides heat from the ground for about 1000 apartments.
The plant was built as a research installation to investigate new facts about geothermal energy and its handling.
So it is a provisional arrangement in some parts. It was built under GDR-conditions and it is equipped with unprotected simple steel tubes, high-grade plate-heat exchangers, a sophisticated automation system, etc. The electric driven heat pumps (about 2 MW thermal power) have to be dismantled to be competitive on the heat market.
Besides replacing of materials new technologies will be installed and tested.

The production well of the geothermal plant produces 60 m3/h at 60 deg. C and 160 g/l salinity from a sandstone formation at 1.500 m depth. The injection well is located 1.300 m away from the production well. The wells are connected by a simple steel tube. The plant supplies a domestic heating system of the 70/35 deg. C type.
The geothermal water is cooled by direct heat exchange and heat pumps which raise heat up to heating net level. An oil fired boiler provides back-energy.
Regarding to the conditions on the market and the impossibility of enlarging the heating net the heat pumps have to be dismantled.
The following works had been specified for the wells to increase their reliability:
. the protection of the 13 3/4" Casing in the production well by resetting a coated 9 5/8" Casing, . replacing the old pumping string by a fibreglass one,
. installing gas-tight well heads at the production and injection wells, etc.,
. filling and sealing of well Wa 2,
. a well inspection programto examine the equipment after a 8-year period of production.
Work in the injection well and the filling and sealing of well Wa 2 were completed within the time scheduled and according to plan.
When carrying out work in the production well Wa 1, complications occured, making it no longer possible to use this well for the geothermal project. This conclusion became a certainty after intensive attempts which lasted four month at saving the well failed. The causes of the condition of the well are to be attributed to inadequate equipment and technologies applied in the construction and installation in 1982. The problem can be solved by drilling a new well. A technical concept for this is being worked out.
The tubes of the whole geothermal loop will be replaced by coated or plastic ones and the heat exchanger will be replaced too.
It is intentional to install an improved filtration system with bag filters and a system of pressure maintenance to :
. reduce pressure pulsations,
. compensate volume changes caused by cooling the thermal water,
. ensure overpressure within the system all the time, etc.
To automate the process a distributed process control system will be used. It contains a special leakage water detection.
At last some reconstructions like :
. renewing of well cellers,
. reconditioning of the production pipe duct,
. construction of removable covers to protect the well heads,
. construction of a building close to the injection well that contains fine filters, injection pumps and the nitrogen system.

Thema/Themen

Aufforderung zur Vorschlagseinreichung

Data not available

Koordinator

STADTWERKE WAREN GMBH
EU-Beitrag
Keine Daten
Adresse
EERNST-ALBAN-STRASSE 2
17192 WAREN
Deutschland

Auf der Karte ansehen

Gesamtkosten
Keine Daten