Green electricity geothermal heating system for northwest hypersalinity regions

Abstract

The utility model discloses a green electricity geothermal heating system for a northwest hypersalinity region, which comprises a middle-deep layer coaxial heat exchange well, a water using position, a water storage tank and a photovoltaic photo-thermal heat pump, the middle-deep layer coaxial heat exchange well is communicated with the water storage tank through a heat compensation cold water pipe and a heat compensation hot water pipe, and a water pump I is mounted between the middle-deep layer coaxial heat exchange well and the water storage tank; a photovoltaic inverter is installed at the circuit output end of the photovoltaic photo-thermal heat pump, the photovoltaic photo-thermal heat pump communicates with the water storage tank through a cold water pipe and a hot water pipe, a fourth water pump is installed between the photovoltaic photo-thermal heat pump and the water storage tank, and the middle-deep layer coaxial heat exchange well communicates with the water using position through the cold water pipe and the hot water pipe. The geothermal energy is used for heating users through a direct supply or heat pump system in a grading and staged manner at different temperature levels, and insufficient parts can be supplemented by a photovoltaic photo-thermal heat pump and the like, so that continuous and stable heat supply to the user side is realized; the photovoltaic photo-thermal heat pump is used for supplying power to all components in the heat supply system, so that the heat supply system has a pure green function, and redundant electric quantity can be output to a power grid.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal heating systems, in particular to a green electric geothermal heating system for high-mineralization areas in northwest China. Background Art

[0002] Geothermal energy is a green and clean resource. Accelerating its development is an important way to achieve the dual carbon goals. Underground hot water in parts of Northwest China is characterized by high pressure and high mineralization. Its use faces difficulties in reinjection, severe crystallization and corrosion, and environmental issues. Currently, it is only used for low-end bathing and swimming, and is not used on a large scale for heating. Most geothermal wells are idle for various reasons after implementation. Western China has long sunshine hours and relatively abundant solar energy resources, which are inexhaustible, clean, and environmentally friendly energy. Its use is not restricted by time and space, making it most suitable for large-scale promotion. However, its lifespan is relatively short.

[0003] Therefore, how to combine geothermal energy and solar energy in the northwest region to form sustainable, green and long-term thermal energy is an urgent problem that needs to be solved. Utility Model Content

[0004] Based on this, it is necessary to provide a green electricity geothermal heating system for the high mineralization areas in the northwest to address the above technical problems.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a green electric geothermal heating system for high-mineralization areas in the northwest, comprising a medium-deep coaxial heat exchange well, a water use point, a water storage tank and a photovoltaic thermal heat pump. The medium-deep coaxial heat exchange well is connected to the water storage tank through a heat supply cold water pipe and a heat supply hot water pipe and is equipped with a water pump 1. The circuit output end of the photovoltaic thermal heat pump is equipped with a photovoltaic inverter. The photovoltaic thermal heat pump is connected to the water storage tank through a cold water pipe and a hot water pipe and is equipped with a water pump 4. The medium-deep coaxial heat exchange well is connected to the water use point through a cold water pipe and a hot water pipe. Heat exchanger one is installed between the medium-deep coaxial heat exchange well and the water use point. Heat exchanger two and a heat pump unit are also installed between the medium-deep coaxial heat exchange well and the water use point. Water pump three is installed at the output end of the cold water pipe at the water use point. Water pump two is installed between heat exchanger two and the heat pump unit. Water pump three is connected to the water tank. The circuit output end of the photovoltaic thermal heat pump is connected to water pump one, water pump two, water pump three and water pump four.

[0006] Preferably, valve four is installed on the hot water supply pipe, and valve one is installed on the hot water supply pipe.

[0007] Preferably, valve 2 is installed on the hot water pipe between the medium-deep coaxial heat exchange well and heat exchanger 2.

[0008] Preferably, a valve three is installed on the hot water pipe between the water use point and the water tank.

[0009] Preferably, a valve five is installed on the hot water pipe between the heat exchanger one and the heat exchanger two.

[0010] Preferably, a valve six is installed on the hot water pipe between the middle-deep coaxial heat exchange well and the heat exchanger one.

[0011] Compared with the prior art, the technical scheme has at least one of the following beneficial effects:

[0012] The different temperature levels of the geothermal energy are utilized to supply heat to users in different stages through a direct supply or a heat pump system, and the insufficient part can be supplemented by a photovoltaic-thermal heat pump, so that the continuous and stable heat supply to the user end is realized.

[0013] The photovoltaic-thermal heat pump is utilized to supply power to the components in the heat supply system, so that the heat supply system is purely green, and the excess power can be output to the power grid. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of an embodiment of the present application.

[0015] In the figure, 1 is a middle-deep coaxial heat exchange well, 2 is a heat exchanger one, 3 is a heat exchanger two, 4 is a heat pump unit, 5 is a water using place, 6 is a water storage tank, 7 is a photovoltaic-thermal heat pump, 8 is a photovoltaic inverter, 9 is a water pump one, 10 is a valve one, 11 is a valve two, 12 is a water pump two, 13 is a water pump three, 14 is a valve three, 15 is a water pump four, 16 is a valve four, 17 is a valve five, and 18 is a valve six. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0017] Please refer to Figure 1The embodiment of the present application provides a green electricity geothermal heating system for use in highly mineralized areas in the northwest, including a medium-deep coaxial heat exchange well 1, a water point 5, a water storage tank 6, and a photovoltaic thermal heat pump 7. The photovoltaic thermal heat pump 7 can be a coupled PVT photovoltaic thermal heat pump. The medium-deep coaxial heat exchange well 1 is connected to the water storage tank 6 via a supplementary cold water pipe and a supplementary hot water pipe, and a water pump 1 9 is installed. A photovoltaic inverter 8 is installed at the circuit output end of the photovoltaic thermal heat pump 7. The photovoltaic thermal heat pump 7 is connected to the water storage tank 6 via a cold water pipe and a hot water pipe, and a water pump 4 15 is installed. The medium-deep coaxial heat exchange well 1 is connected to the water supply point 5 through a cold water pipe and a hot water pipe. A heat exchanger 1 2 is installed between the medium-deep coaxial heat exchange well 1 and the water supply point 5. A heat exchanger 2 3 and a heat pump unit 4 are also installed between the medium-deep coaxial heat exchange well 1 and the water supply point 5. A water pump 3 13 is installed at the output end of the cold water pipe of the water supply point 5. A water pump 2 12 is installed between the heat exchanger 2 3 and the heat pump unit 4. The water pump 3 13 is connected to the water storage tank 6. The circuit output end of the photovoltaic thermal heat pump 7 is connected to the water pump 1 9, the water pump 2 12, the water pump 3 13 and the water pump 4 15;

[0018] A valve 4 16 is installed on the cold water supply pipe, and a valve 10 is installed on the hot water supply pipe;

[0019] A valve 2 11 is installed on the hot water pipe between the medium-deep coaxial heat exchange well 1 and the heat exchanger 2 3;

[0020] A valve 3 14 is installed on the hot water pipe between the water use point 5 and the water storage tank 6;

[0021] A valve 5 17 is installed on the hot water pipe between heat exchanger 1 2 and heat exchanger 2 3;

[0022] Valve six 18 is installed on the hot water pipe between the medium-deep coaxial heat exchange well 1 and heat exchanger one 2. Valve one 10, valve two 11, valve three 14, valve four 16, valve five 17, and valve six 18 can all be solenoid valves and can be supplied with electricity by the photovoltaic thermal heat pump 7.

[0023] In the embodiment, photovoltaic thermal heat pump power generation and geothermal coupled heating mode: when solar energy resources are sufficient, photovoltaic panel heat collection modules are used to generate electricity and heat. In the power supply mode, the photovoltaic thermal heat pump 7 is started, and the generated electric energy is transmitted to the power grid through the photovoltaic inverter 8. During the heating period, the electric energy can be supplemented for the equipment in the system, such as water pump 1 9, water pump 2 12, water pump 3 13, water pump 4 15, heat pump unit 4, heat exchanger 1 2, heat exchanger 2 3, etc.; in the heating mode, the photovoltaic thermal heat pump 7 is started, and the generated hot water is transmitted to the water storage tank 6 through the water pump 15. The hot water in the water storage tank 6 is coupled with the medium-deep geothermal energy system to provide heating for the water use location 5. After the heat exchange is completed at the water use location 5, the heat exchange medium returns to the photovoltaic thermal heat pump 7 for heating and then provides heat again, and the cycle repeats. In the heat supplement mode, the water storage tank 6 and the water pump 1 9 are connected to the medium-deep coaxial heat exchange well 1. When it is necessary to supplement heat for the formation, valve 10 and valve 4 16 are opened, and the hot water circulates through the medium-deep coaxial heat exchange well 1 to accelerate the thermal recovery capacity of the formation. The medium-deep coaxial heat exchange system mainly uses the medium-deep coaxial heat exchange well 1 to conduct heat between the deep geothermal surrounding rock. When the heat resources are abundant and the water temperature can reach above 45°C, the hot water after geothermal heat exchange flows into the heat exchanger 2 through the water pump 9 for heat exchange. The intermediate circulating water after heat exchange is used for heating the water user 5 through the water pump 3 13. At this time, the valve 2 11 is closed, the valve 5 17 and the valve 6 18 are opened. The medium and low temperature hot water after heat exchange in the heat exchanger 23 enters the heat exchanger 2 3 for heat exchange. The low temperature medium water after heat exchange returns to the medium-deep coaxial heat exchange well 1 for reheating. The other side of the heat exchanger 23 is connected to the heat pump unit 4. The intermediate circulating water in the heat exchanger 2 is connected to the heat pump unit 4 through the water pump 2 12. 3 After heat exchange, the temperature is raised in the heat pump unit 4, and the circulating water is raised from medium and low temperature water to medium and high temperature water, and is heated together with the medium and high temperature intermediate circulating water connected to the heat exchanger 1 2 for heating the user 5; as the use time goes by, when the heat resource decays and the high temperature underground medium water changes to medium and low temperature underground medium water, the valve six 18 and the valve five 17 are closed, and the valve two 11 is opened. The intermediate water flows back to the medium and deep coaxial heat exchange well 1 after completing heat exchange in the heat exchanger 2 3. The other side of the heat exchanger 2 3 is connected to the heat pump unit 4. The intermediate circulating water is raised in the heat pump unit 4 through the water pump 2 12 after heat exchange in the heat exchanger 2 3. The circulating water is raised from medium and low temperature water to medium and high temperature water for heating the user's water supply 5.

[0024] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0025] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

Claims

1. A green geothermal heating system for use in high-mineralization areas in Northwest China, comprising a mid-deep coaxial heat exchange well (1), a water use area (5), a water storage tank (6) and a photovoltaic heat pump (7), characterized in that: The medium-deep coaxial heat exchange well (1) is connected to the water storage tank (6) through a cold water pipe and a hot water pipe, and is installed with a water pump (9). The circuit output end of the photovoltaic thermal heat pump (7) is installed with a photovoltaic inverter (8). The photovoltaic thermal heat pump (7) is connected to the water storage tank (6) through a cold water pipe and a hot water pipe, and is installed with a water pump (15). The medium-deep coaxial heat exchange well (1) is connected to the water use point (5) through a cold water pipe and a hot water pipe. There is a heat exchanger 1 (2), a heat exchanger 2 (3) and a heat pump unit (4) are installed between the medium-deep coaxial heat exchange well (1) and the water use point (5), a water pump 3 (13) is installed at the output end of the cold water pipe of the water use point (5), a water pump 2 (12) is installed between the heat exchanger 2 (3) and the heat pump unit (4), the water pump 3 (13) is connected to the water storage tank (6), and the circuit output end of the photovoltaic thermal heat pump (7) is connected to the water pump 1 (9), the water pump 2 (12), the water pump 3 (13) and the water pump 4 (15).

2. The green electricity geothermal heating system for high mineralization areas in Northwest China according to claim 1 is characterized in that: The cold water supply pipe is provided with a valve four (16), and the hot water supply pipe is provided with a valve one (10).

3. The green electricity geothermal heating system for high mineralization areas in Northwest China according to claim 1 is characterized in that: A second valve (11) is installed on the hot water pipe between the medium-deep coaxial heat exchange well (1) and the second heat exchanger (3).

4. The green electricity geothermal heating system for high mineralization areas in Northwest China according to claim 1 is characterized in that: A valve three (14) is installed on the hot water pipe between the water use point (5) and the water storage tank (6).

5. The green electricity geothermal heating system for high mineralization areas in Northwest China according to claim 1 is characterized in that: A valve five (17) is installed on the hot water pipe between the heat exchanger one (2) and the heat exchanger two (3).

6. The green electricity geothermal heating system for high mineralization areas in Northwest China according to claim 1 is characterized in that: A valve six (18) is installed on the hot water pipe between the medium-deep coaxial heat exchange well (1) and the heat exchanger one (2).

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