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HEAT STORAGE IN AN AQUIFER FOR DISTRICT HEATING

Ziel

To demonstrate the feasibility and the economic interest of aquifer heat storage for subsequent use in urban heating.
The vertical peripheral well SCP1 has been in operation several times to cover the needs of the site.
The derivated peripheral wells SCP2D and SCP3D have been equipped with submerged pumps which showed during the following trial runs satisfactory outputs.
The vertical well SCPM5 for temperature measurement has been drilled and temporary equiped.
The equipment and machinery to be fitted in the central well SCPC4 were brought down and succesfully tested in cold water.
The water levels recorded during the last two years in the wells SCP1 and SCP2D show that the nearby gas storage at Beynes has interfered with the pressure of the aquifer in the underground of Thivernal-Grignon. This interference will be the subject of a synthesis to improve the mathematical model for heat storage reservoirs.
The preheating period for conditioning the aquifer has been simulated by means of a mathematical model. Trials on cold water circulation have started in the Central unit ECOSTOC, and the automatic water throuhput control system has been tested.
The preheating and heating period are planned to begin last December 1987.
The EEC Commission has agreed to finance an additional well for temperature measurements in the aquifer, drilling has started on 17 February 1987.
A theoretical study by the Societe Nationale Elf-Aquitaine and the French Atomic Energy Agency has established the theoretical feasibility of heat storage in an aquifer.
The storage installation is connected with a heat recovery unit of a waste incinerator upstream and downstream with a district heating network. Only the storage and the connecting infrastructure are part of this demonstration project but is is clear that this project is dependent on the rest of the heating system which is the object of another energy saving project.
The project consists of 5 phases :
- construction of the surface equipment capable of handling a 180 deg.C underground heat storage, with a recovery capable of feeding 110 deg.C water into the district heating network which will return the water at 60-70 deg.C. Safety, absence of pollution, reliability and economical operation must be assured.
- Drilling and heating of the wells down to an aquifer which presents the suitable depth, thickness and permeability.
- Equipping the wells with the necessary underground infrastructures.
- Connecting of the wells with the surface installations and connecting these with the heat source and the network.
- Cold hydraulic functional tests of the system preheating for ground preparation, carrying out of a series of warm tests and a first cycle at limited power to ascertain the technical and economical feasibility of the system.
Thereafter, the commercial exploitation will start. The location of the installation is planned to be between the waste incinerator of Thivernal-Grigon (Yvelines, France) and the heating network of the neighbouring community of Plaisir. The exact location will depend on the results of exploratory drillings.
The total cost of the project is estimated at FF 37 million and the project will last till 1989. The expected saving amounts to 2,000 TOE per annum, giving a 15-20 year payback period (taking a TOE at FF 1,383.-).For an industrial project, the total cost would be reduced.

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Elf Aquitaine Production
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64018 Pau
Frankreich

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