CN211177478U

CN211177478U - Single-well circulating efficient heat exchange system

Info

Publication number: CN211177478U
Application number: CN201922468249.6U
Authority: CN
Inventors: 张聚斌; 邢晓森; 李予红
Original assignee: Center Of Hebei Province Land And Resources Bureau Of Geology And Mineral Resources Exploration
Current assignee: Center Of Hebei Province Land And Resources Bureau Of Geology And Mineral Resources Exploration
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-04
Anticipated expiration: 2029-12-31

Abstract

The utility model provides a single-well circulation high-efficiency heat exchange system, which comprises a geothermal well, a heat preservation pipe, an air compressor, a steam-water separator, water treatment equipment, a heat pump and a water return pipe; a strainer is arranged in the geothermal well, and packers are arranged in the strainer and outside the strainer; the heat preservation pipe extends into the geothermal well from the top of the geothermal well and penetrates through the packer, and the top of the heat preservation pipe is sealed; when the air compressor works, compressed air in the air outlet pipe enters the heat preservation pipe and forms an air-water mixture with water in the heat preservation pipe, and the air-water mixture rises in the heat preservation pipe and enters the steam-water separator; water separated in the steam-water separator is sent into a heat pump for heat exchange and then flows back into the geothermal well, and air enters the heat preservation pipe from an air outlet pipe of the air compressor for circulation; water above the packer in the geothermal well can enter a heat reservoir from the strainer and then enter the heat preservation pipe below the packer after flowing around the water-resisting layer to form circulation. The single-well circulating efficient heat exchange system is high in heat exchange efficiency, and the heat supply capacity cannot be remarkably reduced after recharging.

Description

Single-well circulating efficient heat exchange system

Technical Field

The utility model relates to a geothermal heat transfer system especially relates to a high-efficient heat transfer system of single well circulation.

Background

Geothermal water is a precious liquid mineral resource, and the problems of water level reduction of a thermal reservoir, insufficient water of a geothermal well, resource waste, environmental pollution and the like are caused by the development of pumping water without recharging for a long time. Aiming at the problems, a development idea that water is not taken when heat is taken from a single well is provided in the industry. Under this mining concept, it is necessary to have sufficient space in the pipe to be able to install corresponding equipment, or to use a closed system. The existing open geothermal well is when transforming the suction pump is extracting geothermal water in the pit, and it is great to occupy the space in the pit, has the not enough problem of intraductal space. The existing single-well heat exchange technology of the open geothermal well has the problem that the heat supply capacity is reduced after recharging due to the design defect of the underground heat exchange structure. The problems affect the popularization and application of the development and utilization of the geothermal energy.

Disclosure of Invention

An object of the utility model is to overcome above-mentioned prior art not enough, provide a high-efficient heat transfer system of single well circulation that heat supply capacity can not show and reduce after recharging.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

According to one aspect of the utility model, a single-well circulation high-efficiency heat exchange system comprises a geothermal well, and is characterized by also comprising a heat preservation pipe, an air compressor, a steam-water separator, water treatment equipment, a heat pump and a water return pipe; the heat storage section of the geothermal well is provided with a water filter pipe penetrating through a water-resisting layer, and the pipe wall of the water filter pipe can be used for water to pass through; packers are arranged in and outside the water filter pipe in the middle of the heat storage section; the heat preservation pipe extends into the geothermal well from the top of the geothermal well and penetrates through the packer, and the top of the heat preservation pipe is closed; the air outlet pipe of the air compressor extends into the heat insulation pipe from the top of the heat insulation pipe, the lower port of the air outlet pipe is positioned below the natural water level, when the air compressor works, compressed air in the air outlet pipe enters the heat insulation pipe and forms an air-water mixture with water in the heat insulation pipe, and the air-water mixture rises in the heat insulation pipe and enters the steam-water separator; the water separated in the steam-water separator can be purified by water treatment equipment and then sent into a heat pump for heat exchange, and then flows back into the geothermal well through the water return pipe, and the air separated in the steam-water separator enters the heat preservation pipe from the air outlet pipe of the air compressor for circulation; and water above the packer in the geothermal well can enter a heat reservoir from the strainer and then enter a heat preservation pipe below the packer after flowing around the water-resisting layer to form circulation.

According to the utility model discloses an embodiment, the outer wall of insulating tube is equipped with the vortex device.

According to the above technical scheme, the utility model discloses an advantage lies in with positive effect:

the utility model discloses the high-efficient heat transfer system of single well circulation, the air compressor machine lets in compressed air to the insulating tube as pumping equipment, and the surface of earth is ascended gradually to the air-water mixture that forms in the insulating tube. The air compressor is arranged on the ground surface, and does not need to be inserted into the geothermal well, so that the space utilization rate of the geothermal well can be improved. The high-temperature gas separated from the gas-water mixture can be conveyed to the geothermal well from the water return pipe again for recycling, and the waste of heat energy in the gas is reduced. Geothermal water is treated by water treatment equipment and then exchanges heat with the heat pump, and then the geothermal water can flow back to the position below the natural water level in the geothermal well from the water return pipe, and enters a heat reservoir layer from the upper part of the packer after exchanging heat with a rock-soil layer in the geothermal well through the water filter pipe, so that the heat exchange efficiency is improved, and the low-temperature geothermal water which is recharged can be further changed into turbulent flow by arranging the turbulent flow device, so that the heat exchange efficiency is improved. The low-temperature geothermal water enters the heat-insulating pipe of the lower well section of the packer after fully exchanging heat, so that the low-temperature geothermal water has a longer flow path and can more fully exchange heat with the rock-soil layer. Therefore, the utility model discloses a high-efficient heat transfer system of single well circulation heat exchange efficiency is high, and the heating power can not show and reduce after the recharge.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic diagram of a single-well circulation high-efficiency heat exchange system according to an embodiment of the present invention.

In the figure: 1. a geothermal well; 2. a heat insulator; 3. a heat preservation pipe; 4. a flow disturbing device; 5. an air outlet pipe; 6. a water return pipe; 7. a water filter pipe; 8. natural water level.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As shown in figure 1, the embodiment of the utility model discloses a high-efficient heat transfer system of single well circulation, include geothermal well 1, still include insulating tube 3, air compressor machine, catch water, water treatment facilities, heat pump and wet return 6.

The part of the geothermal well 1, which is positioned in a heat reservoir layer, is a heat storage section, the heat storage section is provided with a water filter pipe 7 which penetrates through a water-resisting layer, and the pipe wall of the water filter pipe 7 is provided with holes for water to pass through. Packers 2 are arranged in and outside the water filter pipe 7 in the middle of the heat storage section; the heat preservation pipe 3 extends into the geothermal well 1 from the top of the geothermal well 1 and penetrates through the packer 2, and the top of the heat preservation pipe 2 is closed. An air outlet pipe 5 of the air compressor extends into the heat preservation pipe 3 from the top of the heat preservation pipe 3, and the lower port of the air outlet pipe 5 is positioned below a natural water level 8 (meeting the requirement of sinking ratio), when the air compressor works, compressed air in the air outlet pipe 5 enters the heat preservation pipe 3 and forms an air-water mixture with water in the heat preservation pipe 3, and the air-water mixture can rise in the heat preservation pipe 3 and enter a steam-water separator; the water separated in the steam-water separator can be purified by water treatment equipment and then sent into a heat pump for heat exchange, and then flows back into the geothermal well 1 through a water return pipe 6, and the air separated in the steam-water separator enters a heat preservation pipe 3 from an air outlet pipe 5 of an air compressor for circulation; water in the geothermal well 1 above the packer 2 can enter the thermal reservoir from the strainer 7 and then enter the insulating pipe 3 below the packer 2 after bypassing the water barrier to form a circulation.

The outer wall of the heat preservation pipe 3 can be further provided with a flow disturbing device. The flow disturbing device can be a lug, a convex ring and other structures.

When the single-well circulation efficient heat exchange system is used, the air compressor is used as water pumping equipment, compressed air is introduced into the heat preservation pipe 3, and the air-water mixture formed in the heat preservation pipe 3 gradually rises to the ground surface. The air compressor is arranged on the ground surface, and does not need to be inserted into the geothermal well 1, so that the space utilization rate of the geothermal well 1 can be improved. The high-temperature gas separated from the gas-water mixture can be conveyed to the geothermal well 1 from the water return pipe 6 again for recycling, and the waste of heat energy in the gas is reduced. Geothermal water is treated by water treatment equipment and then exchanges heat with the heat pump, and then can flow back to the position below the natural water level in the geothermal well 1 from the water return pipe 6, and enters a heat reservoir layer from the upper part of the packer 2 after exchanging heat with a rock-soil layer in the geothermal well 1 through the water filtering pipe 7, so that the heat exchange efficiency is improved, and the low-temperature geothermal water which is back-filled can be further changed into turbulent flow by arranging the turbulent flow device, so that the heat exchange efficiency is improved. The low-temperature geothermal water enters the heat-insulating pipe of the lower well section of the packer 2 after fully exchanging heat, so that the low-temperature geothermal water has a longer flow path and can more fully exchange heat with the rock-soil layer. Therefore, the utility model discloses a high-efficient heat transfer system of single well circulation heat exchange efficiency is high, and the heating power can not show and reduce after the recharge.

Claims

1. A single-well circulation efficient heat exchange system comprises a geothermal well, and is characterized by further comprising a heat preservation pipe, an air compressor, a steam-water separator, water treatment equipment, a heat pump and a water return pipe; the heat storage section of the geothermal well is provided with a water filter pipe penetrating through a water-resisting layer, and the pipe wall of the water filter pipe can be used for water to pass through; packers are arranged in and outside the water filter pipe in the middle of the heat storage section; the heat preservation pipe extends into the geothermal well from the top of the geothermal well and penetrates through the packer, and the top of the heat preservation pipe is closed; the air outlet pipe of the air compressor extends into the heat insulation pipe from the top of the heat insulation pipe, the lower port of the air outlet pipe is positioned below the natural water level, when the air compressor works, compressed air in the air outlet pipe enters the heat insulation pipe and forms an air-water mixture with water in the heat insulation pipe, and the air-water mixture rises in the heat insulation pipe and enters the steam-water separator; the water separated in the steam-water separator can be purified by water treatment equipment and then sent into a heat pump for heat exchange, and then flows back into the geothermal well through the water return pipe, and the air separated in the steam-water separator enters the heat preservation pipe from the air outlet pipe of the air compressor for circulation; and water above the packer in the geothermal well can enter a heat reservoir from the strainer and then enter a heat preservation pipe below the packer after flowing around the water-resisting layer to form circulation.

2. The single-well circulating efficient heat exchange system of claim 1, wherein the outer wall of the heat preservation pipe is provided with a flow disturbing device.