A system and method for comprehensive utilization of multiple energy sources such as geothermal energy

Abstract

The present invention discloses a system and method for comprehensive utilization of multiple energy sources such as geothermal energy, including a wind power station, a solar power station, a storage station, a heat exchange system, a buried pipe, a ground source heat pump station and a user; the output of the wind power station and the solar power station is connected to the input of the storage station, the output of the wind power station, the solar power station and the storage station are all connected to the input of the heat exchange system, the input of the ground source heat pump station and the input of the user by cables, the output of the heat exchange system is connected to the buried pipe; the buried pipe is connected to the ground source heat pump station to form a loop; the ground source heat pump station and the user are connected by pipelines to form a loop. Combine multiple energy sources to achieve comprehensive utilization, thereby improving heat exchange efficiency, reducing heating costs, reducing carbon emissions, and achieving stable and efficient heating and power supply.

Description

Technical Field

[0001] The present invention belongs to the field of comprehensive utilization of new energy, and relates to a system and method for comprehensive utilization of multiple energy sources such as geothermal energy. Background Art

[0002] Geothermal energy is a new clean energy source. It is natural heat extracted from the earth's crust. This heat comes from the molten rock inside the earth and exists in the form of thermal energy. The reserves of geothermal energy are quite large. Since geothermal energy is stored underground, it will not be affected by any weather conditions. Geothermal resources are also clean, environmentally friendly, and stable.

[0003] A ground source heat pump is a device that transfers shallow geothermal energy from low-grade heat energy to high-grade heat energy by inputting a small amount of high-grade energy. In recent years, the application scope of ground source heat pumps has been gradually expanded.

[0004] At present, the development and utilization of geothermal resources in my country has begun to take shape, with an annual utilization of geothermal energy of 10 billion kWh, and the amount of geothermal development and utilization is growing at a rate of about 10% per year. Geothermal heating, represented by Tianjin and Xi'an, buries underground pipes, uses the ground temperature to heat the water in the underground pipes, and then transports the heated water to users to provide hot water to users. However, when geothermal energy is used alone, the heating temperature is not high, which cannot fully meet the heating supply needs of users, and is easily affected by the season. At the same time, the existing wind and solar energy are vigorously developed at home and abroad, and are easily affected by the weather, with unstable supply and urgent need for peak regulation. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system and method for comprehensive utilization of multiple energy sources such as geothermal energy, so as to combine multiple energy sources and realize comprehensive utilization, thereby improving heat exchange efficiency, reducing heating costs, reducing carbon emissions, and realizing stable and efficient heating and power supply.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A geothermal energy and other multi-energy comprehensive utilization system, including a wind power station, a solar power station, a storage station, a heat exchange system, an underground pipe, a ground source heat pump station and users;

[0008] The output of the wind power station and the solar power station is connected to the input of the storage station. The output of the wind power station, the solar power station and the storage station are connected to the input of the heat exchange system, the input of the ground source heat pump station and the input of the user by cables. The output of the heat exchange system is connected to the buried pipe; the buried pipe is connected to the ground source heat pump station to form a loop; the ground source heat pump station and the user are connected to form a loop by pipelines.

[0009] Preferably, the heat exchange system includes a water tank and a heat exchanger, an electric heating device is arranged in the water tank, the outputs of the wind power station, the solar power station and the storage station are all connected to the input of the electric heating device, the water tank includes a water inlet and a water outlet, and there is a water inlet and a water outlet on each of the left and right sides of the heat exchanger, the water outlet of the water tank is connected to the water inlet of the water tank after passing through the left side of the heat exchanger through a pipeline; the water inlet on the right side of the heat exchanger is connected to the buried pipe, and the water outlet on the right side of the heat exchanger is connected to the ground source heat pump station.

[0010] Furthermore, the water outlet of the water tank is connected in sequence to the first valve, the first pump, the first thermometer and the water inlet on the left side of the heat exchanger; a branch is provided between the first thermometer and the heat exchanger, and the fifth valve and the user are connected in sequence through a pipeline; the water outlet on the left side of the heat exchanger is connected in sequence to the first one-way valve, the first pressure gauge, the second thermometer and the water inlet of the water tank.

[0011] Furthermore, the right water inlet of the heat exchanger is connected in sequence to the second pressure gauge, the buried pipe, the second valve, the third thermometer and the heating end water outlet of the geothermal heat pump station; the right water outlet of the heat exchanger is connected in sequence to the fourth thermometer, the third valve, the second pump, the second one-way valve and the heating end water inlet of the geothermal heat pump station.

[0012] Furthermore, the heat exchanger adopts a floating head heat exchanger, a fixed tube sheet heat exchanger, a U-shaped tube sheet heat exchanger or a plate heat exchanger.

[0013] Preferably, the buried pipe is arranged vertically or horizontally.

[0014] Preferably, the water outlet at the heat transfer end of the geothermal heat pump station is sequentially connected to the fourth valve, the third pump, the sixth thermometer, the third pressure gauge and the user; the water inlet at the heat transfer end of the geothermal heat pump station is sequentially connected to the third one-way valve, the fifth thermometer and the user.

[0015] A method for comprehensive utilization of multiple energy sources such as geothermal energy based on the system described in any one of the above items, wherein the electric energy generated by a wind power station and a solar power station is transmitted and distributed to a storage station, a heat exchange system, a ground source heat pump station and users for energy storage and power supply; the heat exchange system heats the water in the buried pipe; the electric energy transmitted to the ground source heat pump station heats the water in the ground source heat pump station and / or supplies power to the ground source heat pump station; the water heated by the buried pipe is transmitted to the user after passing through the ground source heat pump station for heating or water supply, and then flows back into the ground source heat pump station after use by the user.

[0016] Preferably, the electric heating device is powered by a wind power station, a solar power station and a storage station, the electric heating device heats the water in the water tank, the heated water circulates through a heat exchanger, exchanges heat in the heat exchanger and flows back to the water tank, the water in the buried pipe is heated by the formation temperature, heated again by the heat exchanger and enters the geothermal heat pump station, and then transported by the geothermal heat pump station, the used water flows back and is replenished through the geothermal heat pump station, and then enters the heat exchanger again to heat up.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention connects the wind power station, solar power station and storage station with the heat exchange system, geothermal heat pump station and users, and uses wind energy, solar energy and stored energy to power the heat exchange system, geothermal heat pump station and users. The heat exchange system heats the water in the buried pipes, and the geothermal heat pump station can transport the hot water to the users. It can also recycle the water used by users, and combine new energy sources such as wind energy, solar energy, geothermal energy and energy storage to achieve comprehensive utilization, thereby improving heat exchange efficiency, reducing heating costs, reducing carbon emissions, achieving stable and efficient heating and power supply, and achieving carbon neutrality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0020] Among them: 1-wind power station; 2-solar power station; 3-storage station; 4-water storage tank; 5-first valve; 6-first pump; 7-first thermometer; 8-second thermometer; 9-first pressure gauge; 10-first one-way valve; 11-heat exchanger; 12-second pressure gauge; 13-buried pipe; 14-second valve; 15-third thermometer; 16-fourth thermometer; 17-third valve; 18-second pump; 19-second one-way valve; 20-ground source heat pump station; 21-third one-way valve; 22-fifth thermometer; 23-fourth valve; 24-third pump; 25-sixth thermometer; 26-third pressure gauge; 27-user; 28-fifth valve. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0022] like Figure 1 As shown, the geothermal energy and other multi-energy comprehensive utilization system of the present invention includes: a wind power station 1, a solar power station 2, a storage station 3, a water tank 4, a first valve 5, a first pump 6, a first thermometer 7, a second thermometer 8, a first pressure gauge 9, a first non-return valve 10, a heat exchanger 11, a second pressure gauge 12, a buried pipe 13, a second valve 14, a third thermometer 15, a fourth thermometer 16, a third valve 17, a second pump 18, a second non-return valve 19, a ground source heat pump station 20, a third non-return valve 21, a fifth thermometer 22, a fourth valve 23, a third pump 24, a sixth thermometer 25, a third pressure gauge 26, a user 27 and a fifth valve 28.

[0023] The heat exchange system adopts a water storage tank 4 and a heat exchanger 11.

[0024] In the energy comprehensive utilization system, the wind power station 1 and the solar power station 2 are connected to the storage station 3 through electric wires, so that the electric energy generated by the wind power station 1 and the solar power station 2 is stored in the storage station 3. An electric heating device is arranged in the water storage tank 4, and the wind power station 1 and the solar power station 2 are connected to the electric heating device through electric wires, and the electric heating device can heat the water in the water storage tank 4. The storage station 3 is respectively connected to the water storage tank 4, the ground source heat pump station 20 and the user 27 through electric wires, so that the storage station 3 can supply power to them.

[0025] like Figure 1 As shown, the water outlet at the bottom of the water tank 4 is connected to the first valve 5, the first pump 6, the first thermometer 7 and the water inlet on the left side of the heat exchanger 11 in sequence through pipelines; a branch is provided between the first thermometer 7 and the heat exchanger 11, and the fifth valve 28 and the user 27 are connected in sequence through pipelines; the water outlet on the left side of the heat exchanger 11 is connected to the first one-way valve 10, the first pressure gauge 9, the second thermometer 8 and the water tank 4 in sequence through pipelines.

[0026] The right water inlet of the heat exchanger 11, the second pressure gauge 12, the buried pipe 13, the second valve 14, the third thermometer 15, and the ground source heat pump station 20 are connected through pipelines.

[0027] The right water outlet of the heat exchanger 11 is connected to the fourth thermometer 16, the third valve 17, the second pump 18, the second non-return valve 19, and the ground source heat pump station 20 through pipelines.

[0028] The ground source heat pump station 20 is connected to the fourth valve 23, the third pump 24, the sixth thermometer 25, the third pressure gauge 26, and the user 27 through pipelines.

[0029] The ground source heat pump station 20 is connected to the third one-way valve 21, the fifth thermometer 22, and the user 27 through pipelines.

[0030] The ground source heat pump station 20 can comprehensively distribute the hot water delivered by the second pump 18, and then deliver it to the user 27 through a pipeline; it can also recycle the water used by the user 27, and flexibly and appropriately supplement the return water as needed, while adjusting the water temperature delivered to the user 27.

[0031] The water storage tank 4 is provided with a water outlet at the lower end and a water inlet at the upper end.

[0032] The heat exchanger 11 has a water inlet and a water outlet on both sides. A floating head heat exchanger, a fixed tube sheet heat exchanger, a U-shaped tube sheet heat exchanger, a plate heat exchanger, etc. can be flexibly selected according to needs.

[0033] The buried pipe 13 can be arranged vertically or horizontally, and various arrangements can be set according to production needs.

[0034] The wind power station 1, solar power station 2, and storage station 3 can be flexibly selected in terms of scale, power, and model according to needs. The water storage tank 4 can be flexibly selected in terms of size, model, and the like according to needs.

[0035] The heat transfer medium used in the energy comprehensive utilization system can be water, or other media that are conducive to heat transfer, such as CO2, can be used instead.

[0036] The wind power station 1 and the solar power station 2 can both store the generated electric energy in the storage station 3, heat the water in the water storage tank 4, heat the water in the ground source heat pump station 20, and supply power, and can also supply power to the user 27.

[0037] The water outlet of the water storage tank 4 passes through the first valve 5, the first pump 6, the first thermometer 7, the heat exchanger 11, the first one-way valve 10, the first pressure gauge 9, and the second thermometer 8 to reach the water inlet of the water storage tank 4, forming a closed loop and exchanging heat at the heat exchanger 11.

[0038] The first thermometer 7 is used to measure the outlet water temperature of the water storage tank 4 , and the second thermometer 8 is used to measure the temperature of the return water through the heat exchanger 11 .

[0039] At the right water outlet of the heat exchanger 11, water passes through the fourth thermometer 16, the third valve 17, the second pump 18, the second non-return valve 19, the water inlet of the ground source heat pump station 20, the water outlet of the ground source heat pump station 20, the third thermometer 15, the second valve 14, the buried pipe 13, the second pressure gauge 12, and reaches the right water inlet of the heat exchanger 11. Heat is exchanged in the heat exchanger 11, and water is distributed to users at 20 according to needs, and water and heating are provided.

[0040] The third thermometer 15 is used to measure the water outlet temperature of the ground source heat pump 20. The fourth thermometer 16 is used to measure the water outlet temperature of the right side of the heat exchanger 11.

[0041] The water outlet of the ground source heat pump station 20 passes through the fourth valve 23, the third pump 24, the sixth thermometer 25, the third pressure gauge 26, the user 27, the fifth thermometer 22, the third one-way valve 21, and flows back to the water inlet of the ground source heat pump 20.

[0042] The fifth thermometer 22 is used to measure the temperature of the water discharged after use by the user 27 , and the sixth thermometer 25 is used to measure the temperature of the water entering the user 27 .

[0043] The ground source heat pump station 20 mainly distributes the hot water delivered through the buried pipes 13 and the heat exchanger 11, and then delivers it to thousands of households through pipelines as needed; it can also recycle the water used by users and reheat it for recycling, and flexibly supplement the return water as needed, while adjusting the water temperature delivered to users.

[0044] The buried pipe 13 heats the water flowing through the pipe by utilizing the stratum temperature, thereby increasing the temperature of the water in the pipe. The size, length and style of the buried pipe 13 can be flexibly set.

[0045] The heat transfer medium used in the energy comprehensive utilization system can be water, or other media that are conducive to heat transfer, such as CO2, can be used instead.

[0046] The specific implementation process of the present invention is described as follows:

[0047] After the system is connected, check the sealing of each component and pipeline of the system, fill the water tank 4 with water, open the first valve 5 and the first pump 6 to connect the water to the heat exchanger 11 to form a closed loop. At the same time, inject heat transfer medium into the ground source heat pump station 20, which can be water, CO2 or other medium with high heat transfer efficiency, which can be flexibly set according to needs.

[0048] The electric energy generated by the wind power station 1 and the solar power station 2 is directly transmitted to the water storage tank 4, the ground source heat pump station 20 and the user 27 through electric wires for power supply.

[0049] After being heated by electric energy, the water in the water storage tank 4 circulates through the heat exchanger 11 , and flows back into the water storage tank 4 after heat exchange in the heat exchanger 11 .

[0050] After the water in the buried pipe 13 is heated by the stratum, it is heated again by the heat exchanger 11 and enters the ground source heat pump station 20, and then the ground source heat pump station 20 completes the transportation to the user 27. The used water flows back and is replenished through the ground source heat pump station 20, and then enters the heat exchanger 11 again to heat up.

[0051] The third valve 17, the second pump 18, the second one-way valve 19, and the second valve 14 are opened to circulate the medium in the ground source heat pump station 20 to the heat exchanger 11. After the heat exchange is completed, the fourth valve 23 and the third pump 24 are opened to deliver hot water for the user 27. The used water passes through the third one-way valve 21 and flows back to the ground source heat pump station 20.

[0052] The water heated twice by the buried pipe 13 and the heat exchanger 11 is transported to the user's home through the ground source heat pump station 20 to provide heat or water. After use by the user, the water flows back into the ground source heat pump station 20 through the pipeline.

[0053] The water in the water storage tank 4 can also be directly delivered to the user 27 as hot water through the fifth valve 28 .

[0054] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A multi-energy comprehensive utilization system, characterized in that: It includes a wind power station (1), a solar power station (2), a storage station (3), a heat exchange system, an underground pipe (13), a ground source heat pump station (20), and a user (27); The outputs of the wind power station (1) and the solar power station (2) are connected to the input of the storage station (3); the outputs of the wind power station (1), the solar power station (2) and the storage station (3) are all connected to the input of the heat exchange system, the input of the ground source heat pump station (20) and the input of the user (27) by means of cables; the output of the heat exchange system is connected to the buried pipe (13); the buried pipe (13) is connected to the ground source heat pump station (20) to form a loop; the ground source heat pump station (20) and the user (27) are connected by means of pipelines to form a loop; The heat exchange system comprises a water storage tank (4) and a heat exchanger (11). An electric heating device is arranged in the water storage tank (4). The outputs of the wind power station (1), the solar power station (2) and the storage station (3) are all connected to the input of the electric heating device. The water storage tank (4) comprises a water inlet and a water outlet. The heat exchanger (11) has a water inlet and a water outlet on its left and right sides respectively. The water outlet of the water storage tank (4) is connected to the water inlet of the water storage tank (4) after passing through the left side of the heat exchanger (11) through a pipeline. The water inlet on the right side of the heat exchanger (11) is connected to the buried pipe (13), and the water outlet on the right side of the heat exchanger (11) is connected to the ground source heat pump station (20). The water outlet of the water storage tank (4) is connected in sequence to a first valve (5), a first pump (6), a first thermometer (7) and a water inlet on the left side of the heat exchanger (11); a branch is provided between the first thermometer (7) and the heat exchanger (11), and a fifth valve (28) and a user (27) are connected in sequence through a pipeline; the water outlet on the left side of the heat exchanger (11) is connected in sequence to a first non-return valve (10), a first pressure gauge (9), a second thermometer (8) and a water inlet of the water storage tank (4); The right water inlet of the heat exchanger (11) is sequentially connected to a second pressure gauge (12), a buried pipe (13), a second valve (14), a third thermometer (15), and a water outlet at the heating end of a ground source heat pump station (20); the right water outlet of the heat exchanger (11) is sequentially connected to a fourth thermometer (16), a third valve (17), a second pump (18), a second non-return valve (19), and a water inlet at the heating end of a ground source heat pump station (20); After the water in the buried pipe (13) is heated by the stratum, it is heated again by the heat exchanger (11) and then enters the ground source heat pump station (20). The ground source heat pump station (20) then completes the transportation to the user (27). The used water flows back through the ground source heat pump station (20) and is replenished, and then enters the heat exchanger (11) again to be heated.

2. The multi-energy comprehensive utilization system according to claim 1 is characterized in that: The buried pipe (13) is arranged vertically or horizontally.

3. The multi-energy comprehensive utilization system according to claim 1 is characterized in that: The water outlet at the heat transfer end of the ground source heat pump station (20) is connected in sequence to a fourth valve (23), a third pump (24), a sixth thermometer (25), a third pressure gauge (26), and a user (27); the water inlet at the heat transfer end of the ground source heat pump station (20) is connected in sequence to a third one-way valve (21), a fifth thermometer (22), and a user (27).

4. A method for comprehensive utilization of multiple energy sources based on the system according to any one of claims 1 to 3, characterized in that: The electric energy generated by the wind power station (1) and the solar power station (2) is transmitted and distributed to the storage station (3), the heat exchange system, the ground source heat pump station (20) and the user (27) for energy storage and power supply; the heat exchange system heats the water in the buried pipe (13); the electric energy transmitted to the ground source heat pump station (20) heats the water in the ground source heat pump station (20) and / or supplies power to the ground source heat pump station (20); the water heated by the buried pipe (13) is transmitted to the user (27) after passing through the ground source heat pump station (20) for heat supply or water supply, and then flows back into the ground source heat pump station (20) after use by the user (27).

5. The multi-energy comprehensive utilization method according to claim 4, characterized in that: The electric heating device is powered by the wind power station (1), the solar power station (2) and the storage station (3), and the electric heating device heats the water in the water storage tank (4). The heated water circulates through the heat exchanger (11), exchanges heat through the heat exchanger (11) and then flows back to the water storage tank (4). The water in the buried pipe (13) is heated by the formation temperature and then heated again through the heat exchanger (11) and enters the ground source heat pump station (20). The ground source heat pump station (20) then completes the transportation. The used water flows back through the ground source heat pump station (20) and is replenished, and then enters the heat exchanger (11) again to be heated.

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