Geologica Belgica

1374-8505 2034-1954

 

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Kris PIESSENS & Michiel DUSAR

INTEGRATION OF CO2 SEQUESTRATION AND CO2 GEOTHERMICS IN ENERGY SYSTEMS FOR ABANDONED COAL MINES

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Annexes

Mots-clés : CO2 Sequestration, abandoned coal mines, Belgium, CO2 geothermics, Campine basin.

Abstract

A reservoir located within the 500-1000 m depth range under the thermal conditions reigning in Western Europe, and fi lled with pure CO2 until a suffi cient internal pressure is reached to prevent water fl ooding, will show a reversed density profi le. This reversed profi le may result in condensation at the shallowest levels of the reservoir, causing convection that will transport heat to shallower parts of the reservoir. On the long term, the deep levels of the mine will cool, the top will warm, and convection will become insignifi cant. However, these reservoir properties can be used to produce geothermal energy by extracting heat from the top of the reservoir. Cooling the top of the reservoir will increase the density differences and stimulate convection. Because of the heat exchange during the phase transformations, and because of the large density differences between liquid and gas, the effi ciency and capacity of this system are potentially very high. CO2 geothermics enables the sequestration of CO2 in coal mines. Enhanced Coal Mine Methane and Coal Bed Methane are other sources of environmentally friendly energy that may be developed in conjunction with the injection of CO2. It is also expected that CO2 in a coal mine will reduce the risk of contamination of overlying aquifers. A case study for the Campine collieries shows that CO2 sequestration can be a key element in an energy system that combines both economic and environmental aspects.

To cite this article

Kris PIESSENS & Michiel DUSAR, «INTEGRATION OF CO2 SEQUESTRATION AND CO2 GEOTHERMICS IN ENERGY SYSTEMS FOR ABANDONED COAL MINES», Geologica Belgica [En ligne], volume 7 (2004), number 3-4 - Proceedings of the 5th European Coal Conference, 165-180 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=315.

About: Kris PIESSENS

Royal Belgian Institute of Natural Sciences - Geological Survey of Belgium, Jennerstraat 13, B-1000 Brussels, Belgium. E-mail : kris.piessens@naturalsciences.be

About: Michiel DUSAR

Royal Belgian Institute of Natural Sciences - Geological Survey of Belgium, Jennerstraat 13, B-1000 Brussels, Belgium. E-mail : michiel.dusar@naturalsciences.be