Coaxial heat exchange device for medium-deep geothermal energy

Abstract

The utility model provides a coaxial heat exchange device for medium-deep geothermal energy, and mainly relates to the technical field of geothermal energy development. A coaxial heat exchange device for medium-deep geothermal energy comprises a well pipe, a connecting pipe is fixedly arranged at the top of the well pipe, an outer pipe is fixedly arranged at the top of the connecting pipe, a reducer pipe is fixedly arranged in the outer pipe and close to the top, an inner pipe is fixedly arranged at the bottom of the reducer pipe, a circulating pipe is arranged in the inner pipe, and the circulating pipe penetrates through the outer pipe and the reducer pipe. Spiral blades are arranged on the outer ring of the circulating pipe in an array mode. The utility model has the beneficial effects that the coaxial heat exchange technology is adopted, geothermal water does not need to be extracted, tail water does not need to be recharged, the ground is prevented from settling, and the damage to the geological environment is small; and all the spiral fins are driven to rotate through flowing heat exchange, so that the disturbance effect is achieved, uniform heating is guaranteed, and the heat exchange effect is improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of geothermal energy development, in particular to a coaxial heat exchange device for medium-deep geothermal energy. Background Art

[0002] As a widely distributed, abundant, safe, and stable renewable energy source, geothermal energy boasts high energy efficiency, strong reliability, low cost, and significant emission reduction advantages. It will play a vital role in my country's energy structure transformation. High-quality, clean geothermal energy development will contribute to achieving my country's "carbon peak" and "carbon neutrality" goals. Traditional geothermal energy development typically involves directly extracting high-temperature groundwater from shallow or deep formations, extracting heat through plate heat exchangers, and then reinjecting it. This approach involves large water intake, small heat exchange temperature differences, difficulty in tailwater reinjection, and the potential for damage to the underground environment, leading to ground collapse. Consequently, geothermal energy development and utilization are severely limited. Utility Model Content

[0003] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0004] A coaxial heat exchange device for medium-deep geothermal energy includes a well pipe, characterized in that a connecting pipe is fixedly arranged on the top of the well pipe, an outer pipe is fixedly arranged on the top of the connecting pipe, a reducing pipe is fixedly arranged near the top of the outer pipe, an inner pipe is fixedly arranged at the bottom of the reducing pipe, a circulation pipe is arranged inside the inner pipe, the circulation pipe passes through the outer pipe and the reducing pipe, and spiral blades are arranged in an array on the outer circle of the circulation pipe.

[0005] A sealing sleeve is fixedly provided on the outer ring of the circulation pipe, and the outer ring of the sealing sleeve abuts against the outer pipe and the reducing pipe.

[0006] A water inlet pipe is fixedly arranged on the outer ring of the reducer, and the water inlet pipe passes through the side surface of the outer pipe.

[0007] The outer ring of the connecting pipe is symmetrically fixed with interfaces.

[0008] Compared with the prior art, the beneficial effects of the present invention are:

[0009] The utility model has a simple structure and is easy to install and use. It adopts coaxial heat exchange technology, does not require the extraction of geothermal water, does not require tail water recharge, prevents ground subsidence, and has less damage to the geological environment. The heat exchange through the flow then drives the rotation of each spiral fin, thereby playing a disturbing role, thereby ensuring uniform heating and facilitating the improvement of heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attachment Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] Attachment Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0012] The numbers shown in the accompanying drawings are: 1, well pipe; 2, connecting pipe; 201, interface; 3, outer pipe; 4, reducer; 401, water inlet pipe; 5, inner pipe; 6, circulation pipe; spiral fin; 7, spiral blade; 8, sealing sleeve. DETAILED DESCRIPTION

[0013] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that such equivalent forms also fall within the scope defined in this application.

[0014] In conjunction with the accompanying drawings, a coaxial heat exchange device for medium-deep geothermal energy includes a well pipe 1: a connecting pipe 2 is fixedly arranged on the top of the well pipe 1, an outer pipe 3 is fixedly arranged on the top of the connecting pipe 2, a reducing pipe 4 is fixedly arranged near the top inside the outer pipe 3, an inner pipe 5 is fixedly arranged at the bottom of the reducing pipe 4, a circulation pipe 6 is arranged inside the inner pipe 5, the circulation pipe 6 passes through the outer pipe 3 and the reducing pipe 4, and spiral blades 7 are arranged in an array on the outer circle of the circulation pipe 6.

[0015] A sealing sleeve 8 is fixedly provided on the outer ring of the circulation pipe 6 , and the outer ring of the sealing sleeve 8 abuts against the outer pipe 3 and the reducer 4 .

[0016] A water inlet pipe 401 is fixedly provided on the outer ring of the reducer 4 , and the water inlet pipe 401 passes through the side surface of the outer pipe 3 .

[0017] The outer ring of the connecting pipe 2 is symmetrically fixed with an interface 201 , and the interior of the interface 201 is fixed with instruments and other detection components.

[0018] When the device is in use, the well pipe 1 is set in the warming layer (medium and deep rock and soil) under the ground, the circulation pipe 6 is connected to the external heat exchange unit, and the heat exchange medium enters the inner pipe 5 from the water inlet pipe 401, flows downward to exchange heat with the surrounding rock and soil, and after the temperature gradually rises and reaches the bottom, it is extracted through the circulation pipe 6 and enters the external heat exchange unit. The cooled heat exchange medium enters the water inlet pipe 401 again to carry out the next closed heat absorption cycle. The heat exchange medium inside the inner pipe 5 is fluid, thereby driving the spiral blades 7 to rotate, disturbing the heat exchange medium, thereby ensuring uniform heating.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A coaxial heat exchange device for medium-deep geothermal energy, comprising a well pipe (1), characterized in that: A connecting pipe (2) is fixedly arranged on the top of the well pipe (1), an outer pipe (3) is fixedly arranged on the top of the connecting pipe (2), a reducing pipe (4) is fixedly arranged inside the outer pipe (3) near the top, an inner pipe (5) is fixedly arranged at the bottom of the reducing pipe (4), a circulation pipe (6) is arranged inside the inner pipe (5), the circulation pipe (6) passes through the outer pipe (3) and the reducing pipe (4), and spiral blades (7) are arranged in an array on the outer circle of the circulation pipe (6).

2. The coaxial heat exchange device for medium-deep geothermal energy according to claim 1, characterized in that: A sealing sleeve (8) is fixedly provided on the outer ring of the circulation pipe (6), and the outer ring of the sealing sleeve (8) abuts against the outer pipe (3) and the reducing pipe (4).

3. The coaxial heat exchange device for mid-deep geothermal energy according to claim 1, characterized in that: A water inlet pipe (401) is fixedly provided on the outer ring of the reducer (4), and the water inlet pipe (401) passes through the side surface of the outer pipe (3).

4. The coaxial heat exchange device for mid-deep geothermal energy according to claim 1, characterized in that: The outer ring of the connecting pipe (2) is symmetrically and fixedly provided with an interface (201).

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