CN113531928A

CN113531928A - Heat exchange mechanism for taking heat but not taking water by utilizing deep geothermal well

Info

Publication number: CN113531928A
Application number: CN202010294343.9A
Authority: CN
Inventors: 焦敏; 陈章乐; 付鹏; 王鹏; 黄明薇; 贾颖芳; 王伟玉; 梁迎凯
Original assignee: Hebei Huanjie Energy Technology Co Ltd
Current assignee: Hebei Huanjie Energy Technology Co Ltd
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2021-10-22

Abstract

The invention discloses a heat exchange mechanism for taking heat and not taking water by utilizing a deep geothermal well, which comprises a geothermal well body drilled below the ground, wherein a heat exchange pipeline for exchanging geothermal water is arranged in the geothermal well body, the heat exchange pipeline comprises a water supply pipe and a water return pipe, and the water return pipe is sleeved in the water supply pipe; the geothermal well body sequentially comprises a well chamber, an inner well and a bottom well from top to bottom along the vertical direction; the invention is suitable for underground water heat extraction, and the heat exchange mechanism can extract heat energy in underground water under the condition of not extracting underground water, so that the problem of incapability of realizing recharge is avoided, the condition of illegal pollution discharge is avoided, the extracted heat energy can be used for heating, and the existing heating pressure is reduced.

Description

Heat exchange mechanism for taking heat but not taking water by utilizing deep geothermal well

Technical Field

The invention belongs to the technical field of deep underground water heat taking, and particularly relates to a heat exchange mechanism which can take heat without taking water by utilizing a deep geothermal well.

Background

The heat pump heating is widely applied in the regions to the north of the Huaihe river in China, and the water source heat pump is selected and applied by more people in the regions where the water source is satisfied due to high heat efficiency, smaller land occupation of the construction than the soil source heat pump and low cost, but in recent years, the tax department executes the requirements of relevant laws and regulations to close deep geothermal wells, so that part of the cells cannot be heated, the load of a heating company is not satisfied after the urban central heating is carried out, the temperature of outlet water is not sufficient, and the heating quality of residents cannot be guaranteed;

the main reason for shutting down the deep geothermal well is that the existing deep geothermal well can extract underground water while taking heat, and cannot be legally recharged to a water taking layer, so that water resource waste is caused, and the phenomenon of illegal sewage discharge exists in the extracted underground water.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a heat exchange mechanism which can not take water by utilizing a deep geothermal well to take heat.

In order to achieve the purpose, the invention adopts the following technical scheme:

a heat exchange mechanism for taking heat but not taking water by utilizing a deep geothermal well comprises a geothermal well body drilled below the ground, wherein a heat exchange pipeline for exchanging geothermal water is arranged in the geothermal well body and comprises a water supply pipe and a water return pipe, and the water return pipe is sleeved in the water supply pipe;

the geothermal well body sequentially comprises a well chamber, an inner well and a bottom well from top to bottom along the vertical direction;

the geothermal well body inner wall still is provided with the well casing, the well casing includes well room well casing, well casing and shaft bottom well casing, wherein, the well room well casing and shaft bottom well casing correspond respectively set up in the well room the inner well and the inner wall of bottom well.

Preferably, the water return pipe is a PE plastic pipe with an opening at the bottom, the water feeding pipe is a metal pipe with a closed bottom, a gap is formed between the bottom of the water return pipe and an inner bottom plate of the water feeding pipe, and the water feeding pipe is communicated with the inside of the water return pipe through the gap.

Preferably, the well chamber and the inner wall of the inner well are both coated with well walls, the well walls are arranged between the inner wall of the well chamber and the outer wall of a well casing of the well chamber and between the inner wall of the inner well and the outer wall of the well casing in the well, and the well walls are of a concrete pouring structure.

Preferably, the diameter of the well chamber is larger than that of the inner well, and a conical slope surface structure is adopted at the connecting position of the well chamber and the inner well.

Preferably, the well chamber well pipe and the well pipe are metal well pipes with closed side walls, and the well bottom well pipe is a water-filtering metal well pipe.

Preferably, a spiral sheet is arranged between the outer wall of the water return pipe and the inner wall of the water feeding pipe, and a spiral-structured flow guide channel is formed in a space between the water return pipe and the water feeding pipe through the spiral sheet.

Preferably, a plurality of supporting rods for assisting in fixing the water return pipe are further arranged between the outer wall of the water return pipe and the inner wall of the water feeding pipe.

The heat exchange mechanism can take out heat energy in underground water under the condition of not pumping underground water, so that the problem that recharge cannot be realized and illegal pollution discharge cannot be realized, the taken out heat energy can be used for heating, the existing heating pressure is reduced, and meanwhile, deep geothermal heat belongs to clean energy, so that the heat exchange mechanism is energy-saving and environment-friendly;

according to the invention, the spiral sheet is arranged between the outer wall of the water return pipe and the inner wall of the water conveying pipe of the heat exchange mechanism, and the spiral sheet enables the space between the water return pipe and the water conveying pipe to form the flow guide channel of a spiral structure.

Drawings

FIG. 1 is a schematic diagram showing the overall structure of a heat exchange mechanism for taking heat but not water by using a deep geothermal well according to the invention;

FIG. 2 is a schematic diagram of the overall structure of a heat exchange mechanism for extracting heat but not extracting water by using a deep geothermal well according to the present invention;

FIG. 3 is a schematic diagram of a heat exchange pipeline structure of a heat exchange mechanism for extracting heat but not extracting water by using a deep geothermal well according to the present invention.

Reference numerals: 1. a well pipe; 101. a well casing; 102. a well casing inside the well; 103. a bottom hole casing; 2. a well wall; 3. a geothermal well body; 301. a well chamber; 302. an inner well; 303. a bottom well; 4. a heat exchange line; 401. a water supply pipe; 402. a water return pipe; 5. a strut; 6. a spiral sheet.

Detailed Description

The following will further describe a specific embodiment of a heat exchange mechanism for taking heat but not taking water by using a deep geothermal well, with reference to the accompanying drawings 1 to 3. The heat exchange mechanism for extracting heat and not extracting water by using the deep geothermal well is not limited to the description of the following embodiments.

Example 1:

in this embodiment, a specific structure of a heat exchange mechanism for taking heat but not taking water by using a deep geothermal well is provided, as shown in fig. 1-2, where an arrow direction in fig. 2 is a flow direction of a heat exchange medium, and includes a geothermal well body 3 drilled below the ground, a heat exchange pipeline 4 for exchanging geothermal water is disposed inside the geothermal well body 3, the heat exchange pipeline 4 includes a water supply pipe 401 and a water return pipe 402, and the water return pipe 402 is sleeved inside the water supply pipe 401;

the geothermal well body 3 sequentially comprises a well chamber 301, an inner well 302 and a bottom well 303 from top to bottom along the vertical direction;

the well casing 1 is further arranged on the inner wall of the geothermal well body 3, the well casing 1 comprises a well chamber well casing 101, a well inside casing 102 and a well bottom casing 103, wherein the well chamber well casing 101, the well inside casing 102 and the well bottom casing 103 are respectively and correspondingly arranged on the inner walls of a well chamber 301, an inner well 302 and a bottom well 303.

The water return pipe 402 is a PE plastic pipe with an opening at the bottom, the water feeding pipe 401 is a metal pipe with a closed bottom, a gap is formed between the bottom of the water return pipe 402 and an inner bottom plate of the water feeding pipe 401, and the water feeding pipe 401 and the water return pipe 402 are communicated with each other through the gap.

The inner walls of the well chamber 301 and the inner well 302 are both coated with well walls 2, the well walls 2 are arranged between the inner wall of the well chamber 301 and the outer wall of the well chamber well pipe 101 and between the inner wall of the inner well 302 and the outer wall of the well pipe 102, and the well walls 2 are of a concrete pouring structure.

The diameter of well chamber 301 is greater than the diameter of inner well 302, and the position of well chamber 301 and inner well 302 connection adopts the domatic structure of toper.

The well casing 101 and the well casing 102 are metal casing pipes with closed side walls, and the well casing 103 is a water-filtered metal casing pipe.

By adopting the technical scheme:

when the heat exchange mechanism of the deep geothermal well for taking heat but not taking water is started, a low-temperature medium for heat exchange enters a water supply pipe 401, then flows to the bottom of the water supply pipe 401 from the upper part of the water supply pipe 401, and exchanges heat with the geothermal water in the geothermal well body 3 below the water supply pipe 401 to increase the temperature of the medium, enters a water return pipe 402 after the temperature of the medium is increased, flows back to the upper part of the water return pipe 402 from the lower part of the water return pipe 402, and finally takes heat through a heat exchanger for use, so that the process that the geothermal well does not take heat but does not take water is realized;

the arrangement of the heat exchange mechanism can take out the heat energy in the underground water under the condition of not pumping the underground water, so that the problem of incapability of realizing recharge does not exist, the condition of illegal pollution discharge does not exist, the taken out heat energy can be used for heating, the existing heating pressure is reduced, meanwhile, deep geothermal heat belongs to clean energy, and the energy-saving and environment-friendly effects are achieved.

Example 2:

in this embodiment, a specific structure of a heat exchange mechanism that uses a deep geothermal well to obtain heat but not to obtain water is shown in fig. 3, a spiral sheet 6 is disposed between an outer wall of the water return pipe 402 and an inner wall of the water supply pipe 401, and a flow guide channel of a spiral structure is formed in a space between the water return pipe 402 and the water supply pipe 401 by the spiral sheet 6.

A plurality of supporting rods 5 for assisting in fixing the water return pipe 402 are further arranged between the outer wall of the water return pipe 402 and the inner wall of the water feeding pipe 401.

By adopting the technical scheme:

because be provided with flight 6 between the outer wall of wet return 402 and the inner wall of water pipe 401, make space between wet return 402 and the water pipe 401 form a helical structure's water conservancy diversion passageway through flight 6, such structure setting makes when the medium is by water pipe 401 top flow direction wet return 402 below, the medium is in wet return 402 internal heat transfer partial flow path extension, can promote the mobile heat transfer route of medium, make medium heat exchange efficiency higher, this kind of helical structure's water conservancy diversion passageway makes the difficult palirrhea phenomenon of medium simultaneously.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. The utility model provides an utilize heat transfer mechanism of deep geothermal well heat extraction not water, includes to bore and locates the geothermal well body (3) of below ground which characterized in that: a heat exchange pipeline (4) for exchanging geothermal water is arranged in the geothermal well body (3), the heat exchange pipeline (4) comprises a water supply pipe (401) and a water return pipe (402), and the water return pipe (402) is sleeved in the water supply pipe (401);

the geothermal well body (3) sequentially comprises a well chamber (301), an inner well (302) and a bottom well (303) from top to bottom along the vertical direction;

the inner wall of the geothermal well body (3) is further provided with a well pipe (1), the well pipe (1) comprises a well chamber well pipe (101), an inner well pipe (102) and a bottom well pipe (103), wherein the well chamber well pipe (101), the inner well pipe (102) and the bottom well pipe (103) are correspondingly arranged on the inner wall of the well chamber (301), the inner well (302) and the bottom well (303) respectively.

2. The heat exchange mechanism for extracting heat and not extracting water by using the deep geothermal well as defined in claim 1, is characterized in that: the water return pipe (402) is a PE plastic pipe with an opening at the bottom, the water feeding pipe (401) is a metal pipe with a closed bottom, a gap is formed between the bottom of the water return pipe (402) and an inner bottom plate of the water feeding pipe (401), and the water feeding pipe (401) and the water return pipe (402) are communicated with each other through the gap.

3. The heat exchange mechanism for extracting heat and not extracting water by using the deep geothermal well as defined in claim 1, is characterized in that: well chamber (301) with the inner wall of interior well (302) all wraps the wall of a well (2), the wall of a well (2) are in between the inner wall of well chamber (301) and the outer wall of well chamber well pipe (101) and between the inner wall of interior well (302) and the outer wall of well casing (102), the wall of a well (2) adopt concrete placement structure.

4. The heat exchange mechanism for extracting heat and not extracting water by using the deep geothermal well as defined in claim 1, is characterized in that: the diameter of the well chamber (301) is larger than that of the inner well (302), and a conical slope surface structure is adopted at the connecting position of the well chamber (301) and the inner well (302).

5. The heat exchange mechanism for extracting heat and not extracting water by using the deep geothermal well as defined in claim 1, is characterized in that: the well chamber well pipe (101) and the well pipe (102) adopt metal well pipes with closed side walls, and the well bottom well pipe (103) adopts a water-filtering type metal well pipe.

6. The heat exchange mechanism for extracting heat and not extracting water by using the deep geothermal well as defined in claim 1, is characterized in that: a spiral sheet (6) is arranged between the outer wall of the water return pipe (402) and the inner wall of the water feeding pipe (401), and a spiral-structured flow guide channel is formed in the space between the water return pipe (402) and the water feeding pipe (401) through the spiral sheet (6).

7. The heat exchange mechanism for extracting heat and not extracting water by using the deep geothermal well as defined in claim 6, wherein: a plurality of supporting rods (5) used for assisting in fixing the water return pipe (402) are further arranged between the outer wall of the water return pipe (402) and the inner wall of the water feeding pipe (401).