Closed middle-deep geothermal energy underground heat exchange device

Abstract

The invention relates to a closed middle-deep geothermal energy underground heat exchange device. The device comprises a heat removal inner pipe, a heat exchange sleeve and a support device, wherein the support device is arranged on the ground of a geothermal well; the upper end of the heat removal inner pipe is connected with the support device, and the lower end of the heat removal inner pipe extends into the bottom of the geothermal well; the heat exchange sleeve is arranged at the lower part of the heat removal inner pipe in a sleeving manner; a packer is arranged between the heat exchange sleeve and the geothermal well; a water injection pipe is arranged on the side surface of the support device; a water outlet pipe connected with the heat removal inner pipe is arranged at the top of the support device; and the lower end of the heat removal inner pipe is connected with a screen pipe and a balance weight pipe. The screen pipe is connected to the lower end of the heat removal inner pipe, water flow flowing through the heat removal inner pipe can be filtered by the screen pipe and then enters the heat removal inner pipe, and impurities in the water flow can be blocked outside the heat removal inner pipe by the screen pipe, so that the situation that the inner wall of the heat removal inner pipe is abraded by the impurities and the service life of the heat removal inner pipe is affected is avoided.

Description

technical field [0001] The invention relates to the technical field of geothermal energy heating, in particular to a closed medium-deep geothermal energy downhole heat exchange device. Background technique [0002] Deep-hole heat exchange technology refers to the technology in deep wells that circulates fluid inside a single well through coaxial casings, and exchanges heat with formations based on heat conduction, thereby developing deep geothermal energy in the form of "taking heat but not water". [0003] The existing medium-deep geothermal energy heat exchange device directly inserts the inner tube for heat extraction into the geothermal well. Since the well contains impurities, the water flow will bring the impurities into the inner tube for heat extraction during the heat exchange through water. The inner wall of the heat-taking inner pipe causes abrasion, which affects the service life of the heat-taking inner pipe. Contents of the invention [0004] The technical p...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a closed medium-deep geothermal energy downhole heat exchange device and a crushing gear roller device to solve the problems mentioned in the background technology

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