System for extracting and decontaminating groundwater
A system for the exploitation of geothermal heat and for conveying and decontaminating ground water is disclosed. The system comprises a main pipe ( 20 ), arranged in a pit ( 10 ) of well and is subdivided into an upper and a lower part by a transverse seal ( 21 ). The transverse seal has an opening in which a pump ( 22 ) is arranged which delivers water from the lower part of the main pipe. The pump is connected to a delivery pipe ( 30 ) which is connected to an overground closed circuit. The closed circuit at its other end leads to the upper part of the main pipe and the main pipe has through openings ( 23 ) towards the surroundings upstream and downstream of the transverse seal. The main pipe is surrounded by a porous bed which surrounds the hollow space of the pit around the main pipe. The porous bed is interrupted by a sealing material ( 12 ) at the level of the transverse seal so that the porous bed is hydraulically interrupted. The use of the system is also described.
1. A system for utilization of geothermal heat comprising a main pipe,
wherein
the main pipe is divided into an upper part and a lower part by a transverse seal, and wherein the transverse seal has an opening which has a pump arranged therein that triggers and/or supports flow, which conveys water from the lower part of the main pipe, said pump being connected with an extraction pipe which in turn is connected with an above-ground closed circuit, said closed circuit, at its other end, leading to the upper part of the main pipe, and the main pipe having through-openings towards the surroundings upstream and downstream of the transverse seal, said through-openings towards the surroundings downstream of the transverse seal being in form of filter sections and said main pipe being surrounded by a porous bed which is a glass bed made of glass spheres which surrounds the remaining hollow space of the bore around the main pipe, said porous bed being interrupted by a sealing material at the level of the transverse seal inside the main pipe so that the porous bed is hydraulically interrupted, wherein the glass spheres have a diameter of 0.5 to 10 mm and wherein the porous bed has an effective pore space of more than 30%.
2. The system according to claim 1 ,
wherein
the sealing material has an to and bottom surface and both surfaces are in direct contact with said glass spheres of said porous bed.
3. The system according to claim 1 ,
wherein
the sealing material separating the porous bed is clay or cement.
4. The system according to claim 1 ,
wherein
the main pipe is made of PVC, stainless steel or a combination thereof.
5. A method for the extraction of geothermal heat comprising providing the system according to claim 1 and extracting geothermal heat via said system.
6. A method for the dissipation of heat comprising providing the system according to claim 1 and dissipating heat via said system.
7. A method for extracting groundwater comprising providing the system according to claim 1 and extracting groundwater via said system.
8. A method for decontaminating groundwater comprising providing the system according to claim 1 and decontaminating groundwater via said system.
9. A method for producing electricity comprising the system according to claim 1 and producing electricity via said system.
10. The system according to claim 1 ,
wherein
the main pipe is arranged centrally in a bore of a well.
11. The system according to claim 1 , wherein the extraction pipe is insulated.
12. The system according to claim 1 , wherein the glass spheres have a diameter of from 1.5 to 5 mm.