CN216409343U

CN216409343U - Gas drive type deep well geothermal ground heat exchanger

Info

Publication number: CN216409343U
Application number: CN202123017278.4U
Authority: CN
Inventors: 韩元红; 张廷会; 张育平; 付德亮; 张晓宏; 薛宇泽; 陶鹏飞
Original assignee: Shaanxi Coal Geology Group Co ltd
Current assignee: Shaanxi Coal Geology Group Co ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-04-29
Anticipated expiration: 2031-12-03

Abstract

The utility model provides a gas-driven deep-well geothermal ground-buried pipe heat exchanger which comprises an outer water inlet pipe, an inner water outlet pipe and a gas injection rod, wherein the inner water outlet pipe is positioned inside the outer water inlet pipe, the inner water outlet pipe is sequentially connected with a water pump and an exhaust valve through pipelines, the exhaust valve is connected with a heat pump, the heat pump is connected with the outer water inlet pipe through a pipeline, the gas injection rod is arranged inside the inner water outlet pipe, the air compressor is connected with the gas injection rod, the length of the inner water outlet pipe is smaller than that of the gas injection rod, the bottom of the gas injection rod is provided with a gas outlet, and the end part of the gas outlet reaches the bottom of a well. According to the utility model, the gas injection device is added, the disturbance of water bodies at different layers is increased, and the disturbance of air to deep water is utilized, so that the heat transfer is faster, the heat exchange rate is improved, and the heat collection efficiency is improved; the length of the water outlet inner pipe is reduced, the requirements of heat preservation and high temperature resistance of the water outlet inner pipe are reduced, and the initial installation cost is reduced; the requirement of the circulating pump pressure is reduced, the requirement specification of the water pump is reduced, the power consumption is saved in the operation process, and the initial assembly cost is saved.

Description

Gas drive type deep well geothermal ground heat exchanger

Technical Field

The utility model belongs to the technical field of geothermal energy development, and relates to a gas drive type deep well geothermal buried pipe heat exchanger for developing and utilizing non-water-taking type geothermal resources.

Background

The development and utilization of geothermal resources in the middle and deep layers are the most main fields of the development and utilization of geothermal resources at present, and the deep well heat exchange technology is the most environment-friendly development and utilization mode. At present, many urban environmental protection policies do not allow groundwater extraction, and the deep well heat exchange technology of 'no water is taken when heat is taken' also becomes a necessary trend for the development and utilization of the geothermal industry. However, the most common deep well heat exchanger (also called a medium-deep geothermal buried pipe) has high heat exchange cost and low heat exchange efficiency, and the popularization and utilization of the technology in a large range are seriously hindered. Therefore, the development and use of efficient, low cost heat exchangers has been a major goal and direction of this technological breakthrough.

The research of the domestic current heat exchanger is just started, the structure is set up comparatively simply, there is not a gas drive heat exchange device, the domestic and foreign deep well heat exchangers all adopt water injection pumps at present, and the water returns to the development and utilization mode on ground after the circulation heating in the pit. The existing deep well heat exchanger is the most common deep well heat exchanger with concentric pipes (also called coaxial casing pipes), i.e. a hollow inner pipe is added in a common well pipe, the inner pipe is directly inserted into the well pipe, water is injected into the well from an annular gap between the inner pipe and the outer pipe, and then the water is pumped from the bottom of the well to the ground from the inside of the inner pipe for utilization. The distance from the inner pipe to the well bottom is short of scientific conclusions at present, the common inner pipe is dozens of meters away from the well bottom, enterprise engineering projects adopt hundreds of meters or even thousands of meters, the depth of a deep well is large, the depth of the inner pipe is also large, the temperature resistance requirement is high, the inner pipe is made of petroleum steel pipes with high manufacturing cost, but the petroleum steel pipes have good heat conductivity, the near-surface part causes great heat energy waste, the near-wellhead section is made of vacuum heat-insulation steel pipes, and the manufacturing cost is extremely high. Because the depth of the deep well is large, the water can be injected into the circulating water pump from the outer pipe for a circle by the aid of the extremely large pump pressure from the inner pipe to the bottom of the well, and then the water is taken out of the inner pipe, so that power consumption is large; meanwhile, the current drilling technical experience is that in order to prevent the influence of sediment, the distance from an inner pipe to the well bottom is generally set to be dozens of meters or more, and some devices are set to be 1000 meters or more away from the well bottom in order to save cost, so that the flow velocity of water without the inner pipe at the well bottom is lower, the heat at the deep part cannot be fully exchanged, the heat exchange quantity is reduced, the resource waste is caused, and the drilling cost is wasted.

SUMMERY OF THE UTILITY MODEL

Aiming at the explanation of the background technology, the utility model provides an air-driven deep-well geothermal buried pipe heat exchanger, which solves the technical problem of high heat exchange cost of the existing middle-deep geothermal buried pipe.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a gas drive type middle-deep geothermal ground heat exchanger, includes into water outer tube, goes out water inner tube and gas injection pole, it is inside that the water inner tube is located into water outer tube to go out the water inner tube, it sets up the gas injection pole to go out water inner tube inside, it is less than the gas injection pole to go out water inner tube length, gas injection pole bottom is the gas vent, and the gas vent tip is near until the shaft bottom.

In the technical scheme, the water inlet outer pipe is a petroleum steel pipe for drilling, the water outlet inner pipe is a PE pipe, and the whole water injection rod is a compact thin pipe meeting engineering requirements and is particularly good.

Among the above-mentioned technical scheme, the length difference of play water inner tube and water injection pole is: depth of well-depth of distance from end of gas vent to bottom of well-depth of inner tube.

Among the above-mentioned technical scheme, still include heat pump, air compressor machine, water pump, go out the water inner tube and connect water pump, discharge valve through pipeline order, discharge valve connects the heat pump, and the heat pump passes through the water inlet outer tube of pipe connection, and the air compressor machine is connected the pole of annotating gas, considers the influence degree of depth such as drilling specialty sediment, sets up to the shaft bottom distance and generally is 30 meters-50 meters.

According to the utility model, the gas injection device is added, so that the disturbance of water bodies at different layers is increased, and the disturbance of air to deep water is utilized, so that the heat transfer is faster, the heat exchange rate is improved, the cost can be greatly saved, and the heat collection efficiency is improved; reduce the inner tube degree of depth, need not consider the high temperature resistance of play water inner tube, reduce the demand of tubular product material, very big reduce cost, the demand specification of reduction circulating pump pressure that can also be very big reduces the water pump, and the power consumption is saved to the operation in-process, and very big saving is just adorned the cost.

Drawings

In order to more clearly illustrate the embodiments of the patent of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the patent of the present invention, and other drawings can be obtained by those skilled in the art without inventive exercise.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a longitudinal horizontal schematic view of the present invention;

wherein, 1 outer tube of intaking, 2 outer tubes of water play, 3 gas injection poles, 31 gas vents, 4 heat pumps, 5 air compressors, 6 water pumps, 7 discharge valve, 8 clients.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given in the present patent application without inventive step, shall fall within the scope of protection of the present patent application.

According to the drawings 1-2, the embodiment of the gas-drive deep-well geothermal buried pipe heat exchanger comprises an outer water inlet pipe, an inner water outlet pipe and a gas injection rod, and further comprises a heat pump, an air compressor and a water pump, wherein the outer water inlet pipe is a petroleum steel pipe for well drilling, the inner water outlet pipe is a PE pipe with good heat insulation performance and corrosion resistance, and the whole water injection rod is a compact thin steel pipe.

The water outlet inner pipe is positioned inside the water inlet outer pipe, the water outlet inner pipe is sequentially connected with a water pump and an exhaust valve through pipelines, the exhaust valve is connected with a heat pump, the heat pump is connected with the water inlet outer pipe through a pipeline, an air injection rod is arranged inside the water outlet inner pipe, an air compressor is connected with the air injection rod, the length of the water outlet inner pipe is smaller than that of the air injection rod, the bottom of the air injection rod is an exhaust port, the end part of the exhaust port reaches the bottom of the well, and the distance from the exhaust port to the bottom of the well is generally 30-50 meters by considering the influence depth of drilling professional sediment and the like; the length difference between the water outlet inner pipe and the water injection rod is as follows: the depth of the well, the distance from the end part of the exhaust port to the bottom of the well, and the depth of the inner pipe are as follows: the well depth is between 30 and 50 meters and the depth of the inner pipe, and the larger the well depth is, the larger the length difference between the inner pipe and the water injection rod is, and the better the effect of the heat exchanger is. The depth of the inner pipe is determined by comprehensively considering the optimal heat insulation depth of the inner pipe and the maximum tolerance temperature (generally 80 ℃) stratum depth of the PE pipe, when the optimal heat insulation depth is greater than the maximum tolerance temperature, the maximum tolerance temperature stratum depth is selected, and otherwise, the optimal heat insulation depth is selected.

The utility model relates to a heat exchange process, which comprises the following steps of drilling a well, fixing the well, arranging an inner water pipe, arranging a water injection rod, injecting water, injecting gas and collecting water, wherein the used equipment can adopt the heat exchange technology and equipment in the prior art, such as a heat pump, an air compressor and a water pump, injecting air into the well through the air compressor to increase the disturbance of water bodies at different positions, completing the heat exchange through the water pump and the heat pump, and conveying the exchanged heat energy to a user end through the heat pump. This technical scheme very big reduce cost, simultaneously, the demand of the reduction circulating pump pressure that can be very big of the reduction of play water inner tube length reduces the demand specification of water pump, and the power consumption is saved to the operation in-process, and very big saving is first assembled the cost.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall be covered by the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a gas drive type deep well geothermal ground heat pipe laying heat exchanger which characterized in that: including the outer tube that intakes, go out water inner tube and gas injection pole, it is inside that the outer tube that intakes is located to go out the water inner tube, go out the inside gas injection pole that sets up of water inner tube, it is less than the gas injection pole to go out water inner tube length, gas injection pole bottom is the gas vent, and the gas vent tip is near the bottom of the well.

2. A gas-drive deep-well geothermal ground heat exchanger according to claim 1, wherein: the distance from the end of the exhaust port to the bottom of the well is 30-50 m.

3. A gas-drive deep-well geothermal borehole heat exchanger according to claim 1 or claim 2, wherein: the length difference between the water outlet inner pipe and the water injection rod is as follows: depth of well-depth of distance from end of gas vent to bottom of well-depth of inner tube.

4. A gas drive type deep well geothermal ground heat exchanger according to claim 3, wherein: the water inlet outer pipe is a petroleum steel pipe for well drilling, the water outlet inner pipe is a PE pipe, and the whole water injection rod is a compact steel pipe.

5. The gas drive type deep well geothermal ground heat exchanger according to claim 4, wherein: the water-saving heat pump water heater further comprises a heat pump, an air compressor and a water pump, wherein the water outlet inner pipe is sequentially connected with the water pump and an exhaust valve through pipelines, the exhaust valve is connected with the heat pump, the heat pump is connected with the water inlet outer pipe through a pipeline, and the air compressor is connected with an air injection rod.