Geothermiemotor und Verfahren zur Energiegewinnung aus Gesteinsmassen mit einem Geothermiemotor

Details

Veröffentlichungs-Nr.

EP4717913

Anmeldetag

19. November 2024

Veröffentlichung

1. April 2026

Rechtsraum

EP

IPC

F03G4/00, F02G1/04(GLAESER HANS JOACHIM et al.)(EST CO LTD et al.)

Abstract

Geothermal engine with one element for absorbing heat from an upper heat source and one element for discharging heat to a lower heat source, the geothermal engine being suitable to be placed within a borehole (17) and having a cooling medium circuit, a cylindrical housing (9) with a cylinder head (10), a working piston (1), a displacer (2) with a regenerator (3), a crankshaft, and connecting rods for the piston and displacer, a rock mass - cylinder head heat exchanger as well as a generator-starting device. The working piston discharges heat to lower heat source, while the rock mass - cylinder head heat exchanger (11) absorbs heat from the upper heat source. The cooling medium circuit comprises a pump, a casing pipe (13), and a central pipe (15). Inside the casing pipe (13), there is a flow space (14) for the heated cooling medium, while inside the central pipe (15), there is a flow space (16) for the cooled cooling medium, which constitutes the lower heat source and circulates over the upper surface of the working piston (1). The crankshaft (4) is enclosed within the engine's working chamber, where a working gas is present between the piston (1) and the displacer (2). The pump includes at least one suction valve (7) and at least one discharge valve (8).Method for obtaining energy from the rock mass using such a geothermal engine mounted in a borehole in which the movement of a working piston (1) is initiated and the flow and change in volume of a working gas located inside of the engine is forced providing mechanical energy needed to start the engine with the use of an external generator-starting device (19), powered from the surface and working in starting mode, then the generator-starting device (19) is switched to generating mode, then the compressed working gas is heated with heat obtained from the borehole and transfers said heat to cool cooling medium, converting the mechanical energy of the working piston movement with use of the generator-starting device (19) that is set to generating mode in the electrical energy, that is extracted with wires (20) on the surface and pumping heated cooling medium with use of at least one discharge valve (8) through the cooling medium circuit to the surface.

Anmelder

Firma

Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie

Land

🇵🇱 Polen