Middle-deep layer geothermal energy heat supply and refrigeration comprehensive utilization system based on heat storage

Abstract

The utility model provides a medium-deep layer geothermal energy heat supply and refrigeration comprehensive utilization system based on heat storage. Comprising a middle-deep layer geothermal buried pipe unit, a heat storage tank connected with the middle-deep layer geothermal buried pipe unit through a heat storage pipe, a geothermal coil pipe connected with the middle-deep layer geothermal buried pipe unit through a geothermal water inlet pipe, a refrigerating machine connected with the geothermal water inlet pipe in parallel, and control valves on a control pipeline. According to the medium-deep layer geothermal energy heat supply and refrigeration comprehensive utilization system based on heat storage provided by the utility model, medium-deep layer geothermal energy heat exchange water is stored in the heat storage tank in the non-working time of the geothermal coil pipe through the heat storage tank no matter whether refrigeration or heat removal is carried out, and when the system needs to be started again, the medium-deep layer geothermal energy heat exchange water is stored in the heat storage tank. According to the utility model, sufficient heat exchange water can be rapidly used for comprehensively replacing water in the geothermal coil pipe, so that the requirements of rapid heating and refrigeration are met, high-cost investment of a middle-deep layer geothermal buried pipe unit is avoided, the maintenance cost is also reduced, and the working efficiency is improved. The technical problem that the operation cost can be further reduced on the premise that the temperature drop or temperature rise speed is not reduced in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cold and heat supply system technical field relates to heat supply refrigeration system, concretely relates to a kind of middle-deep geothermal energy heat supply refrigeration comprehensive utilization system based on heat storage. BACKGROUND

[0002] Conventional geothermal heat supply system refers to the heat supply system using geothermal energy as main heat source, and geothermal energy is the energy stored in the earth itself, which belongs to renewable energy. According to the way of geothermal flow into the heat supply system, the geothermal heat supply system can be divided into direct heating and indirect heating. Direct heating means that geothermal flow is directly introduced into the heat supply system, and indirect heating means that geothermal flow transfers heat energy to circulating water in the heat supply system through a heat exchanger. However, geothermal energy has been running for a long time, sometimes the phenomenon of insufficient operating heat occurs, the operating effect is not ideal, and it is difficult to meet the actual heating demand.

[0003] Therefore, in the prior art, a system for comprehensive utilization of geothermal energy and solar energy is disclosed in Chinese patent No. CN202121737569.8. The specific technical solution is as follows: a middle-deep geothermal energy and solar energy comprehensive utilization system, including a control cabinet, a power distribution cabinet, a dry hot well and a geothermal water pressure pump. The dry hot well is connected with the geothermal water pressure pump, heat pump, butterfly valve, secondary pipe network circulating pump, third electromagnetic valve and heat user through pipeline in sequence. The solar energy equipment is connected with the hot water circulating pump, second electromagnetic valve and heat user through pipeline in sequence. The hot water circulating pump is connected with the secondary pipe network through the first electromagnetic valve. The utility model is a supplement to the existing middle-deep geothermal heating method, introduces solar energy auxiliary heating, realizes the comprehensive utilization of geothermal energy and solar energy, improves the reliability of heat supply operation, saves labor cost, realizes the reutilization of comprehensive energy, makes the heat supply more stable, and is environmentally friendly and energy-saving.

[0004] On the other hand, in the field of medium-deep geothermal heat pipe heat pump heating technology, medium-deep geothermal energy is extracted through the way of heat exchange by partition without exploiting underground water, and stable, continuous, low-carbon and efficient heating is realized by combining with electrically driven heat pump heating technology, which is a key technology to realize clean and low-carbon heating in the field of building. However, due to the high temperature of medium-deep geothermal energy, it is only suitable for heating in autumn, and heat cannot be discharged in summer, so in order to make up for the defects that medium-deep geothermal heat pipe heat pump heating technology can only take heat, a corresponding cooling and heat discharging system needs to be matched to realize efficient and low-carbon combined supply of cooling and heating. The conventional cooling and heat discharging system includes two ways, one way is to discharge heat to the air through a cooling tower, and the other way is to discharge heat to shallow low-temperature soil through a shallow geothermal pipe. The patent application number CN202111472019.2 discloses a medium-deep geothermal energy combined cooling and heating supply system and method, which includes a medium-deep geothermal heat pipe unit, a shallow geothermal pipe unit, a cooling tower unit, a heat source side water pump unit, a cooling side water pump unit, a heat pump unit, a user side water pump unit and a building user unit. The method extracts medium-deep geothermal energy through the way of heat exchange by partition based on the medium-deep geothermal heat pipe, and realizes stable, continuous and efficient utilization of medium-deep geothermal energy, a high-grade renewable energy. At the same time, combined with shallow geothermal pipe and cooling tower, a clean and low-carbon cooling and heating system is constructed, and then according to the comparison of total life cycle cost under different heat source proportion, the best heat source proportion and system form are determined, and on the basis of fully tapping the energy-saving and emission-reducing benefits of renewable geothermal energy, the best economic benefit is realized.

[0005] However, in the prior art, the energy consumption of taking heat for the utilization of medium-deep geothermal energy is mainly in the operation of the delivery pump, based on which, reducing the operation time of the delivery pump can further reduce the operation cost, but if the delivery pump is intermittently stopped, the temperature drop or temperature rise speed will be slow when cooling or heating is required again. In order to overcome the above problems, more deep buried pipes can be added, but this will increase the installation cost, and therefore, a technical solution to solve the above technical problems is urgently needed. SUMMARY

[0006] In view of the deficiencies in the prior art, the utility model provides a medium-deep geothermal energy heating and refrigeration comprehensive utilization system based on heat storage to solve the technical problem of further reducing operation cost without reducing the temperature drop or temperature rise speed in the prior art.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme to realize it:

[0008] The utility model relates to a kind of based on heat storage's middle-deep geothermal energy heating refrigeration comprehensive utilization system, including middle-deep geothermal buried pipe unit, wherein, the lower side of the middle-deep geothermal buried pipe unit with the one end of main water pipe is communicated, the other end of main water pipe is divided into two ways, one of which is communicated with the one end of geothermal inlet pipe, the other end of geothermal inlet pipe leads to the side end of geothermal coil, the other road is communicated with the one end of refrigerator inlet pipe, the other end of refrigerator inlet pipe leads to the side of refrigerator, the other side of refrigerator is communicated with the one end of refrigerator outlet pipe, the other end of refrigerator outlet pipe is communicated with the other end of geothermal inlet pipe and leads to the side end of geothermal coil, the other side end of geothermal coil is communicated with the one end of return pipe, the other side of geothermal coil is also communicated with the one end of heat exchanger inlet pipe, the other end of heat exchanger inlet pipe leads to the end shell inside of heat exchanger, the other end shell inside of heat exchanger is communicated with the one end of heat exchanger outlet pipe, the other end of heat exchanger outlet pipe is into the one end of return pipe, the other end of return pipe leads to the upper side of middle-deep geothermal buried pipe unit.

[0009] The other side of the middle-deep geothermal buried pipe unit is communicated with the one end of heat storage pipe, the other end of heat storage pipe is communicated with the one side of heat storage tank, the other side of heat storage tank is communicated with the one end of heat storage outlet pipe, the other end of heat storage outlet pipe is into the other end of main water pipe.

[0010] The utility model also has the following technical features:

[0011] The heat exchanger shell is provided with a plurality of stacked cavity structure heat exchange fins, one side of the heat exchange fin is communicated with the other end of the heat exchanger inlet pipe, and the other side of the heat exchange fin is communicated with the one end of the heat exchanger outlet pipe.

[0012] The heat exchanger is also provided with a fan.

[0013] The main water pipe is provided with a control valve, the geothermal inlet pipe is provided with a geothermal inlet valve, the refrigerator inlet pipe is provided with a refrigeration inlet valve, the refrigerator outlet pipe is provided with a refrigeration outlet valve, the heat storage pipe is provided with a heat storage valve, and the heat storage outlet pipe is provided with a heat storage outlet valve.

[0014] The middle-deep geothermal buried pipe unit includes one or more middle-deep geothermal buried pipes, and the buried depth of each middle-deep geothermal buried pipe is 2-3 km.

[0015] The refrigerator inlet pipe and the refrigerator outlet pipe are connected in parallel on the geothermal inlet pipe.

[0016] The geothermal coil and the heat exchanger are connected in parallel.

[0017] The heat storage tank is a heat preservation tank body buried below the ground surface.

[0018] The refrigerating machine is a lithium bromide refrigerating machine.

[0019] Compared with the prior art, the application has the following beneficial technical effects:

[0020] The heat storage-based middle-deep geothermal energy heating and refrigeration comprehensive utilization system can quickly replace the water in the geothermal coil with sufficient heat exchange water when it needs to be started again, so that the requirements of rapid heating and refrigeration are met, the high cost investment of the middle-deep geothermal buried pipe unit is avoided, and the maintenance cost is reduced, thereby solving the technical problem of further reducing the operation cost under the premise of not reducing the temperature drop or temperature rise speed in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the middle-deep geothermal energy heating and refrigeration comprehensive utilization system.

[0022] Figure 2 It is a heat exchange fin array schematic view of the middle-deep geothermal energy heating and refrigeration comprehensive utilization system.

[0023] Figure 3 It is a flow process schematic view of the middle-deep geothermal energy heating and refrigeration comprehensive utilization system.

[0024] The meanings of the various reference numbers in the drawings are as follows: 1 - middle-deep geothermal buried pipe unit, 2 - main water pipe, 3 - geothermal water inlet pipe, 4 - geothermal coil, 5 - refrigerating machine water inlet pipe, 6 - refrigerating machine, 7 - refrigerating machine water outlet pipe, 8 - return pipe, 9 - heat exchanger water inlet pipe, 10 - heat exchanger, 11 - heat exchanger water outlet pipe, 12 - heat storage pipe, 13 - heat storage tank, 14 - heat storage water outlet pipe, 15 - heat exchange fin, 16 - fan, 17 - control total valve, 18 - geothermal water inlet valve, 19 - refrigeration water inlet valve, 20 - refrigeration water outlet valve, 21 - heat storage valve, 22 - heat storage water outlet valve.

[0025] The specific content of the application will be further explained and described in detail in combination with the embodiments below. DETAILED DESCRIPTION

[0026] It should be noted that all the devices and parts in the application, if not specifically stated, all use the devices and parts known in the prior art.

[0027] In accordance with the above technical solution, the specific embodiments of the application are given below, and it should be noted that the application is not limited to the following specific embodiments, and any equivalent variations made on the basis of the technical solution of the application fall within the protection scope of the application.

[0028] Embodiment:

[0029] The embodiment provides a heat storage based comprehensive utilization system for heat supply and refrigeration of middle-deep geothermal energy, which comprises a middle-deep geothermal buried pipe unit 1, as shown in the figure. Figure 1 The lower side of the middle-deep geothermal buried pipe unit 1 is connected with one end of a main water pipe 2, the other end of the main water pipe 2 is divided into two paths, one path of the main water pipe 2 is connected with one end of a geothermal water inlet pipe 3, the other end of the geothermal water inlet pipe 3 is connected with one side end of a geothermal coil 4, the other path of the main water pipe 2 is connected with one end of a refrigeration machine water inlet pipe 5, the other end of the refrigeration machine water inlet pipe 5 is connected with one side of a refrigeration machine 6, the other side of the refrigeration machine 6 is connected with one end of a refrigeration machine water outlet pipe 7, the other end of the refrigeration machine water outlet pipe 7 is connected with the other end of the geothermal water inlet pipe 3 and then connected with one side end of the geothermal coil 4, the other side end of the geothermal coil 4 is connected with one end of a return pipe 8, the other side of the geothermal coil 4 is also connected with one end of a heat exchanger water inlet pipe 9, the other end of the heat exchanger water inlet pipe 9 is connected with one end of a heat exchanger 10, the other end of the heat exchanger 10 is connected with one end of a heat exchanger water outlet pipe 11, the other end of the heat exchanger water outlet pipe 11 is connected with one end of the return pipe 8, the other end of the return pipe 8 is connected with one side upper part of the middle-deep geothermal buried pipe unit 1.

[0030] As shown in the figure, Figure 1 the other side of the middle-deep geothermal buried pipe unit 1 is connected with one end of a heat storage pipe 12, the other end of the heat storage pipe 12 is connected with one side of a heat storage tank 13, the other side of the heat storage tank 13 is connected with one end of a heat storage water outlet pipe 14, the other end of the heat storage water outlet pipe 14 is connected with the other end of the main water pipe 2.

[0031] As shown in the figure, Figure 2 the heat exchanger 10 is provided with a plurality of layers of heat exchange fins 15 in a cavity structure, one side of the heat exchange fins 15 is connected with the other end of the heat exchanger water inlet pipe 9, the other side of the heat exchange fins 15 is connected with one end of the heat exchanger water outlet pipe 11.

[0032] As shown in the figure, Figure 2 the heat exchanger 10 is also provided with a fan 16 outside.

[0033] As shown in the figure, Figure 1 the main water pipe 2 is provided with a control total valve 17, the geothermal water inlet pipe 3 is provided with a geothermal water inlet valve 18, the refrigeration machine water inlet pipe 5 is provided with a refrigeration water inlet valve 19, the refrigeration machine water outlet pipe 7 is provided with a refrigeration water outlet valve 20, the heat storage pipe 12 is provided with a heat storage valve 21, and the heat storage water outlet pipe 14 is provided with a heat storage water outlet valve 22.

[0034] As shown in the figure, Figure 1 the refrigeration machine water inlet pipe 5 and the refrigeration machine water outlet pipe 7 are connected in parallel on the geothermal water inlet pipe 3.

[0035] As Figure 1 shown in the figure, the geothermal coil 4 and the heat exchanger 10 are arranged in parallel.

[0036] In this embodiment, the middle-deep geothermal buried pipe unit 1 includes one or more middle-deep geothermal buried pipes, each of which has a buried pipe depth of 2-3 km. Without exploiting underground water, the middle-deep geothermal buried pipe extracts middle-deep geothermal energy of 70-90℃ underground through the way of heat exchange by partition.

[0037] In this embodiment, the heat storage tank 13 is a heat preservation tank body buried underground.

[0038] In this embodiment, the refrigerator 6 is a lithium bromide refrigerator.

[0039] In this embodiment, as Figure 3 shown in the figure, when heating in winter:

[0040] S1: the user needs to take heat:

[0041] Through the control cabinet / controller, the control total valve 17, the heat storage outlet valve 22 and the geothermal inlet valve 48 are opened, and the heat storage valve 21, the refrigeration inlet valve 19 and the refrigeration outlet valve 20 are closed. The geothermal water of the middle-deep geothermal buried pipe unit 1 enters the geothermal inlet pipe 3 through the main water pipe 2, then heats the indoor room through the geothermal coil 4 or / and the heat exchanger 10, and finally returns to the middle-deep geothermal buried pipe unit 1 through the return pipe 8.

[0042] S2: the user temporarily does not need to take heat:

[0043] Through the control cabinet / controller, the control total valve 17 and the heat storage valve 21 are opened, and the geothermal inlet valve 18, the heat storage outlet valve 22, the refrigeration inlet valve 19 and the refrigeration outlet valve 20 are closed. The geothermal water of the middle-deep geothermal buried pipe unit 1 is stored in the heat storage tank 13 through the heat storage pipe 12. When the heating is needed again, the middle-deep geothermal buried pipe unit 1 can assist in quickly replacing the cold water in the geothermal coil 4 or / and the heat exchanger 10.

[0044] In this embodiment, as Figure 3 shown in the figure, when refrigerating in summer:

[0045] S1: the user needs to refrigerate:

[0046] By controlling the cabinet / controller, open the control total valve 17, heat storage outlet valve 22, refrigeration inlet valve 19 and refrigeration outlet valve 20, close the geothermal inlet valve 18 and heat storage valve 21; the geothermal water of the middle-deep geothermal ground buried pipe unit 1 enters the refrigeration machine 6 through the main water pipe 2 and the refrigeration machine inlet pipe 5, then enters the geothermal coil 4 or / and the heat exchanger 10 through the refrigeration machine outlet pipe 7 and the geothermal inlet pipe 3 to cool the indoor room, and finally returns to the middle-deep geothermal ground buried pipe unit 1 through the return pipe 8.

[0047] S2 When there is no need for refrigeration in the user:

[0048] By controlling the cabinet / controller, open the control total valve 17 and heat storage valve 21, close the geothermal inlet valve 18, heat storage outlet valve 22, refrigeration inlet valve 19 and refrigeration outlet valve 20; the geothermal water of the middle-deep geothermal ground buried pipe unit 1 is stored to the heat storage tank 13 through the heat storage pipe 12, and when the refrigeration is needed again, it can assist the middle-deep geothermal ground buried pipe unit 1 to quickly provide a large amount of water for refrigeration for the refrigeration machine 6, so as to quickly replace the warm water in the geothermal coil 4 or / and the heat exchanger 10.

Claims

1. A heat supply and refrigeration comprehensive utilization system based on heat storage of medium-deep geothermal energy, comprising a medium-deep geothermal ground pipe unit (1), characterized in that, The lower side of the middle-deep geothermal buried pipe unit (1) is connected with one end of the main water pipe (2), the other end of the main water pipe (2) is divided into two ways, one of which is connected with one end of the geothermal water inlet pipe (3), the other end of the geothermal water inlet pipe (3) leads to one side of the geothermal coil (4), the other way is connected with one end of the refrigeration machine water inlet pipe (5), the other end of the refrigeration machine water inlet pipe (5) leads to one side of the refrigeration machine (6), the other side of the refrigeration machine (6) is connected with one end of the refrigeration machine water outlet pipe (7), the other end of the refrigeration machine water outlet pipe (7) is connected with the other end of the geothermal water inlet pipe (3) and leads to one side of the geothermal coil (4), the other side of the geothermal coil (4) is connected with one end of the return pipe (8), the other side of the geothermal coil (4) is also connected with one end of the heat exchanger water inlet pipe (9), the other end of the heat exchanger water inlet pipe (9) leads to the inside of the heat exchanger (10), the other end of the heat exchanger (10) is connected with one end of the heat exchanger water outlet pipe (11), the other end of the heat exchanger water outlet pipe (11) is connected with one end of the return pipe (8), the other end of the return pipe (8) leads to the upper side of the middle-deep geothermal buried pipe unit (1). The other side of the middle-deep geothermal buried pipe unit (1) is connected with one end of the heat storage pipe (12), the other end of the heat storage pipe (12) is connected with one side of the heat storage tank (13), the other side of the heat storage tank (13) is connected with one end of the heat storage water outlet pipe (14), the other end of the heat storage water outlet pipe (14) is connected with the other end of the main water pipe (2).

2. The heat storage-based combined heating and cooling system using medium-depth geothermal energy according to claim 1, wherein The inside of the heat exchanger (10) is provided with a plurality of layers of stacked heat exchange fins (15) of the cavity structure, one side of the heat exchange fin (15) is connected with the other end of the heat exchanger water inlet pipe (9), the other side of the heat exchange fin (15) is connected with one end of the heat exchanger water outlet pipe (11).

3. The heat storage-based combined heating and cooling system using medium-depth geothermal energy according to claim 1, wherein The outside of the heat exchanger (10) is also provided with a fan (16).

4. The heat storage-based combined heating and cooling system using medium-depth geothermal energy according to claim 1, wherein The main water pipe (2) is provided with a control total valve (17); the geothermal water inlet pipe (3) is provided with a geothermal water inlet valve (18); the refrigeration machine water inlet pipe (5) is provided with a refrigeration water inlet valve (19); the refrigeration machine water outlet pipe (7) is provided with a refrigeration water outlet valve (20); the heat storage pipe (12) is provided with a heat storage valve (21); the heat storage water outlet pipe (14) is provided with a heat storage water outlet valve (22).

5. The heat storage-based combined heating and cooling system using medium-depth geothermal energy according to claim 1, wherein The middle-deep geothermal buried pipe unit (1) comprises one or more middle-deep geothermal buried pipes, wherein the buried pipe depth of each middle-deep geothermal buried pipe is 2-3 km.

6. The heat storage-based combined heating and cooling system using medium-depth geothermal energy according to claim 1, wherein The refrigeration machine water inlet pipe (5) and the refrigeration machine water outlet pipe (7) are connected in parallel on the geothermal water inlet pipe (3).

7. The heat storage-based combined heating and cooling system using medium-depth geothermal energy according to claim 1, wherein The geothermal coil (4) and the heat exchanger (10) are connected in parallel.

8. The heat storage-based combined heating and cooling system using medium-depth geothermal energy according to claim 1, wherein The heat storage tank (13) is a heat preservation tank body buried below the ground surface.

9. The heat storage-based combined heating and cooling system using medium-depth geothermal energy according to claim 1, wherein The refrigeration machine (6) is a lithium bromide refrigeration machine.

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