Middle-deep layer heat exchange well ground circulation control device

Abstract

The utility model relates to the technical field of medium-deep geothermal resource development and utilization, in particular to a medium-deep heat exchange well ground circulation control device which comprises a ground circulation pipeline which is respectively connected with a heat exchange well water inlet, a heat exchange well water outlet, a low-temperature water source connector and a hot water supply connector. The heat exchange well is used for at least enabling low-temperature water to form circulating runoff in the heat exchange well; the third gate is mounted on the circulating runoff forming pipeline and is used for controlling whether the low-temperature water forms circulating runoff in the heat exchange well or not; the temperature sensor is arranged on the pipeline at the water outlet of the heat exchange well; the control system is connected with the temperature sensor and the third gate, controls opening and closing of the gates according to the temperature of the water outlet of the heat exchange well, adjusts the circulating runoff time of low-temperature water in the heat exchange well and accordingly controls the water temperature of the water outlet of the heat exchange well. The control system is connected with the temperature sensor and the third gate, the gate is controlled to be opened and closed according to the temperature of the water outlet of the heat exchange well, and the water temperature of the water outlet of the heat exchange well is controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of the development and utilization of medium-deep geothermal resources, in particular to a ground circulation control device for a medium-deep heat exchange well. Background Art

[0002] The medium-deep heat exchange technology uses water as a carrier of geothermal resources to bring heat from the geothermal reservoir to the ground for utilization. In the existing medium-deep geothermal resource utilization technology, low-temperature water is injected into the medium-deep heat exchange well from the water inlet, and the geothermal energy is absorbed during the runoff in the heat exchange well, and then flows out of the heat exchange well from the water outlet. If the water temperature at the water inlet is too low, although the water temperature at the water outlet increases after one circulation cycle of the runoff, it still cannot reach the temperature required for bathing.

[0003] Therefore, it is necessary to design a ground circulation control device for a medium-deep heat exchange well to improve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a ground circulation control device for a medium-deep heat exchange well.

[0005] The utility model provides a ground circulation control device for a medium-deep heat exchange well, which includes a ground circulation pipeline. The ground circulation pipeline is respectively connected to the water inlet of the heat exchange well, the water outlet of the heat exchange well, the low-temperature water source interface and the hot water supply interface, and is used to at least enable low-temperature water to form a circulating runoff in the heat exchange well;

[0006] A third gate, which is installed on the pipeline forming the circulating runoff, is used to control whether low-temperature water forms a circulating runoff in the heat exchange well;

[0007] A temperature sensor, which is arranged on the pipeline at the water outlet of the heat exchange well, is used to collect the temperature at the water outlet of the heat exchange well in real time;

[0008] A control system, which is connected to the temperature sensor and the third gate, controls the opening and closing of the gate according to the temperature at the water outlet of the heat exchange well, and adjusts the circulating runoff time of low-temperature water in the heat exchange well, so as to control the water temperature at the water outlet of the heat exchange well.

[0009] Further, the ground circulation pipeline includes a first pipeline, a second pipeline and a third pipeline;

[0010] The first pipeline is used to connect the water inlet of the heat exchange well and the low-temperature water source;

[0011] The second pipeline is used to connect the water outlet of the heat exchange well and the hot water supply end;

[0012] The temperature sensor is installed on the second pipeline;

[0013] The third pipe is used to connect the first pipe and the second pipe;

[0014] The third gate is installed on the third pipe and is used to enable the low-temperature water after heat exchange to re-enter the heat exchange well from the water inlet of the heat exchange well for heat exchange, forming a circulating runoff.

[0015] Furthermore, it further includes a first gate and a second gate;

[0016] The first gate is installed on the first pipe and is located between the connection of the first pipe and the third pipe and the low-temperature water source;

[0017] The second gate is installed on the second pipe and is located between the connection of the second pipe and the third pipe and the hot water supply end;

[0018] The control system is respectively connected to the first gate and the second gate.

[0019] Furthermore, the temperature sensor is located between the connection of the first pipe and the third pipe and the water outlet of the heat exchange well.

[0020] Furthermore, expansion joints are provided on the first pipe and the second pipe to adjust the deformation of the first pipe and the second pipe caused by thermal expansion and contraction.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] The present utility model is provided with a control system and a ground circulation pipe; the control system is connected to the temperature sensor and the third gate installed on the ground circulation pipe, and controls the opening and closing of the gate according to the temperature at the water outlet of the heat exchange well, so as to control the water temperature at the water outlet of the heat exchange well. Description of the Drawings

[0023] The following drawings only schematically illustrate and explain the present utility model and are not used to limit the scope of the present utility model, where:

[0024] Figure 1 : Schematic structural diagram of the deep heat exchange well ground circulation control device in the present utility model;

[0025] In the figure: 1 - Deep heat exchange well system; 2 - Inner well central pipe; 3 - Heat exchange well water inlet; 4 - Heat exchange well water outlet; 5 - Control system; 6 - Second pipe; 7 - Temperature sensor; 8 - First gate; 9 - Second gate; 10 - Third gate; 11 - Low-temperature water source interface; 12 - Hot water supply interface, 13 - First pipe, 14 - Third pipe. Detailed Embodiments

[0026] To make the purpose, technical solution, design method and advantages of the present utility model clearer, the present utility model will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] As Figure 1 shown, the present utility model provides a ground circulation control device for medium-deep heat exchange wells. An in-well central pipe 2 is arranged in the medium-deep heat exchange well 1. One end of the in-well central pipe 2 located at the heat exchange well water outlet 4 is connected to a first pipeline 6; the other end of the in-well central pipe 2 is located inside the medium-deep heat exchange well. The medium-deep heat exchange well 1 is used for heat energy exchange between the in-well water path and the out-well geothermal energy. The ground circulation control device for the medium-deep heat exchange well includes a ground circulation pipeline. The ground circulation pipeline is respectively connected to the heat exchange well water inlet 3, the heat exchange well water outlet 4, the low-temperature water source interface 11 and the hot water supply interface 12, and is used to enable at least low-temperature water to form a circulating runoff in the heat exchange well;

[0028] A third gate 9 is installed on the pipeline forming the circulating runoff, and is used to control whether low-temperature water forms a circulating runoff in the heat exchange well;

[0029] A temperature sensor 7 is arranged on the pipeline at the heat exchange well water outlet 4, and is used to collect the temperature at the heat exchange well water outlet in real time;

[0030] A control system 5 is connected to the temperature sensor 7 and the third gate 9, and controls the opening and closing of the gate according to the temperature at the heat exchange well water outlet 4. When the temperature at the heat exchange well water outlet 4 is lower than the set value, the circulating runoff time of low-temperature water in the heat exchange well is adjusted, so as to control the water temperature at the heat exchange well water outlet 4 to reach the required temperature;

[0031] Further, the ground circulation pipeline includes a first pipeline 13, a second pipeline 6 and a third pipeline 14;

[0032] The temperature sensor 7 is installed on the second pipeline 6;

[0033] The first pipeline 13 is used to connect the heat exchange well water inlet 3 and the low-temperature water source;

[0034] The second pipeline 6 is used to connect the heat exchange well water outlet 4 and the hot water supply end;

[0035] The third pipeline 14 is used to connect the first pipeline 13 and the second pipeline 6;

[0036] The third gate 9 is installed on the third pipeline 14, and is used to enable the low-temperature water after heat exchange to re-enter the heat exchange well from the heat exchange well water inlet 3 for heat exchange, so as to form a circulating runoff;

[0037] Among them, a first three-way joint is installed on the first pipeline 13. The first pipeline 13 is respectively connected to the heat exchange well water inlet 3 and the low-temperature water source interface 11 through the first three-way joint, and the first pipeline 13 is connected to the heat exchange well water outlet 4 through the third pipeline 14 via the first three-way joint;

[0038] A second three-way joint is installed on the second pipeline 6. The second pipeline 6 is respectively connected to the heat exchange well water outlet 4 and the hot water supply interface 12 through the second three-way joint, and the second pipeline 6 is connected to the heat exchange well water inlet 3 through the third pipeline 14 via the second three-way joint; it is used to realize the circulating runoff of the injected low-temperature water in the heat exchange well;

[0039] Furthermore, the gate includes a first gate 10 and a second gate 8;

[0040] The first gate 10 is installed on the first pipeline 13 and is located between the connection of the first pipeline 13 and the third pipeline 14 and the low-temperature water source;

[0041] The second gate 8 is installed on the second pipeline 6 and is located between the connection of the second pipeline 6 and the third pipeline 14 and the hot water supply end;

[0042] The control system 5 is respectively connected to the first gate 10 and the second gate 8;

[0043] It should be noted that the control system 5 is respectively connected to the first gate 10, the second gate 8 and the third gate 9. The first gate 10, the second gate 8 and the third gate 9 are all electric control valves. The opening and closing of each automatic control gate are controlled according to the temperature at the heat exchange well water outlet 4. When the temperature at the heat exchange well water outlet 4 is lower than the set value, the control system 5 controls the second gate 8 to open, so that the water at the heat exchange well water outlet 4 enters the medium-deep heat exchange well again for secondary heating; when the temperature at the heat exchange well water outlet 4 reaches or is higher than the set value, the control system 5 controls the second gate 8 to close, which is used to allow the low-temperature water source to enter the heat exchange well, and at the same time allow the hot water to flow to the hot water supply interface 12 for users to use;

[0044] Furthermore, the first pipeline 13, the second pipeline 6 and the third pipeline 14 are respectively ductile iron pipes, polyethylene pipes, copper pipes or stainless steel pipes; and expansion joints are provided on the first pipeline and the second pipeline, which are used to adjust the deformation of the first pipeline and the second pipeline caused by thermal expansion and contraction.

[0045] It should be noted that the present utility model is provided with a ground circulation pipeline and a control system. The ground circulation pipeline is respectively connected to the heat exchange well water inlet 3, the heat exchange well water outlet 4, the low-temperature water source interface 11 and the hot water supply interface 12, and is used to enable at least low-temperature water to form a circulating runoff in the heat exchange well; a third gate 9 is installed on the pipeline forming the circulating runoff and is used to control whether the low-temperature water forms a circulating runoff in the heat exchange well; a temperature sensor 7 is arranged on the pipeline at the heat exchange well water outlet 4 and is used to collect the temperature at the heat exchange well water outlet in real time; the control system 5 is connected to the temperature sensor 7 and the third gate 9 installed on the ground circulation pipeline, and controls the opening and closing of the gate according to the temperature at the heat exchange well water outlet 4, so as to control the water temperature at the heat exchange well water outlet 4 to reach the temperature required for bathing.

[0046] The various embodiments of the present utility model have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the disclosed embodiments.

Claims

1. A surface circulation control device for a medium-deep heat exchange well, characterized in that: It includes a ground circulation pipeline, which is respectively connected to the water inlet of the heat exchange well, the water outlet of the heat exchange well, the low-temperature water source interface and the hot water supply interface, and is used to at least enable the low-temperature water to form a circulating runoff in the heat exchange well; The third gate is installed on the circulating runoff pipeline to control whether the low-temperature water forms a circulating runoff in the heat exchange well; A temperature sensor, which is arranged on a pipe at a water outlet of the heat exchange well and is used to collect the temperature at the water outlet of the heat exchange well in real time; A control system is connected to the temperature sensor and the third gate, and controls the gate opening and closing according to the temperature of the water outlet of the heat exchange well, thereby adjusting the circulation time of the low-temperature water in the heat exchange well, thereby controlling the water temperature of the water outlet of the heat exchange well.

2. A surface circulation control device for a medium-deep heat exchange well according to claim 1, characterized in that: The ground circulation pipeline includes a first pipeline, a second pipeline and a third pipeline; The first pipeline is used to connect the water inlet of the heat exchange well and the low-temperature water source; The second pipeline is used to connect the water outlet of the heat exchange well and the hot water supply end; The temperature sensor is installed on the second pipe; The third pipeline is used to connect the first pipeline and the second pipeline; The third gate is installed on the third pipeline, and is used to allow the low-temperature water after heat exchange to re-enter the heat exchange well from the water inlet of the heat exchange well for heat exchange, thereby forming a circulating runoff.

3. A surface circulation control device for a medium-deep heat exchange well according to claim 2, characterized in that: Also includes a first gate and a second gate; The first gate is installed on the first pipeline and is located between the connection point between the first pipeline and the third pipeline and the low-temperature water source; The second gate is installed on the second pipe and is located between the connecting point of the second pipe and the third pipe and the hot water supply end; The control system is connected to the first gate and the second gate respectively.

4. A surface circulation control device for a medium-deep heat exchange well according to claim 3, characterized in that: The temperature sensor is located between the connecting point of the first pipeline and the third pipeline and the water outlet of the heat exchange well.

5. A surface circulation control device for a medium-deep heat exchange well according to claim 4, characterized in that: The first pipeline and the second pipeline are provided with telescopic tubes for adjusting the deformation of the first pipeline and the second pipeline caused by thermal expansion and contraction.

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