Geothermal energy combined with heat storage water tank heat supply system and method

Abstract

The application discloses a geothermal energy combined heat storage water tank heat supply system and method, which comprises a geothermal energy heat exchange unit, a large-temperature-difference heat storage water tank, a geothermal heat supply heat exchange station, a second water collector, a heat network water supply pipeline, a solar energy collector and a factory heat radiator. The geothermal energy heat exchange unit comprises a plurality of heat exchange pipelines arranged in geothermal wells. The system and method realize efficient heat energy storage and flexible allocation, improve the adaptability of the system to load fluctuation and the comprehensive energy utilization rate.

Description

Technical Field

[0001] This invention belongs to the field of geothermal energy heating and utilization technology, and relates to a heating system and method using a geothermal energy combined with a hot water storage tank. Background Technology

[0002] Geothermal heating is a clean energy technology that uses the Earth's internal heat for building heating or hot water supply, and it has advantages such as stability, environmental friendliness, and sustainability.

[0003] Publication No. CN116428633B discloses a geothermal heat exchange station system, including a water collector connected to a first cold water source; a geothermal heating unit with its input end connected to a second cold water source and its output end connected to various user terminals; several heat exchange pipelines, each corresponding to a geothermal well, with the inlet end of each pipeline connected to the water collector and the outlet end of each pipeline branching out; at least two independent heat exchange pipelines forming a group, with one outlet end of each independent heat exchange pipeline in the same group first connected to each other and then connected to the geothermal heating unit as a hot water source; the other outlet end of each independent heat exchange pipeline is connected to the water collector; a control system includes at least two independent heat exchange pipelines connected in parallel and connected to a primary intelligent control device; the data acquisition section is configured for... Based on the collected outlet water temperature and flow rate, the acquisition section is respectively set on the outlet water pipeline after the heat exchange pipelines of each group are connected; the control section is configured to record and analyze the raw data of the collected outlet water temperature and flow rate, and generate control commands based on the data analysis results; the data fusion device is configured to fuse the data information transmitted by at least two control sections to generate gradient data of the difference between any two sets of fused data; the data fusion device is configured to fuse the data information transmitted by at least two control sections to generate gradient data of the difference between any two sets of fused data, and is connected to each of the control sections respectively. Each set of gradient data is randomly sent to two control sections. The control section compares the received gradient data with the data information of its own set, and controls the flow direction and flow rate of the liquid in the independent pipelines of its own group according to the comparison result. By grouping at least two independent heat exchange pipelines together, the conventional approach of requiring temperature sensors and flow meters in each independent heat exchange pipeline is avoided, significantly reducing the number of sensors and flow meters used. This also avoids the energy loss during the journey of hot water from the heat exchange pipelines to the geothermal heating unit, which leads to a large difference between the actual outlet water temperature entering the geothermal heating unit and the temperature monitored by the temperature sensors. Furthermore, by integrating several independent heat exchange pipelines and connecting them to the geothermal heating unit, the complex connection methods required for each independent heat exchange pipeline to the geothermal heating unit are reduced. This ensures that the temperature and volume of the total hot water source entering the geothermal heating unit per unit time meet design requirements, while increasing the amount of hot water entering the geothermal heating unit per unit time.

[0004] In the field of geothermal heating, existing technologies have the following shortcomings:

[0005] Although geothermal heat exchange station systems improve temperature control accuracy through grouped heat exchange pipelines and intelligent control, they lack energy storage components and are unable to cope with heat load fluctuations.

[0006] Although large temperature difference heating systems based on low-grade heat sources integrate multiple heat sources, the synergistic mechanism between heat storage and geothermal energy is unclear, making it difficult to fully leverage the stable heating advantages of geothermal energy.

[0007] In existing technologies, the integration of geothermal energy and thermal storage devices suffers from problems such as insufficient system coupling and lack of intelligent control strategies, resulting in low energy utilization and poor load adaptability. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heating system and method using a geothermal energy combined with a hot water storage tank. This system and method achieve efficient storage and flexible allocation of thermal energy, and improve the system's adaptability to load fluctuations and the overall energy utilization rate.

[0009] To achieve the above objectives, the present invention discloses a heating system of a geothermal energy combined hot water storage tank, including a geothermal energy heat exchange unit, a large temperature difference hot water storage tank, a geothermal heating heat exchange station, a second water collector, a heating network water supply pipeline, a solar collector and a factory heat exchanger. The geothermal energy heat exchange unit includes several heat exchange pipelines installed in the geothermal well.

[0010] The first outlet of each heat exchange pipeline is connected to the inlet of the large temperature difference hot water storage tank and the primary side inlet of the geothermal heating heat exchange station. The second outlet of each heat exchange pipeline is connected to the inlet of the second water collector. The primary side outlet of the geothermal heating heat exchange station is connected to the heating network water supply pipeline. The outlet of the solar collector and the outlet of the factory heat exchanger are connected to the secondary side inlet of the geothermal heating heat exchange station through a parallel pipeline. The secondary side outlet of the geothermal heating heat exchange station is connected to the inlet of the large temperature difference hot water storage tank. The outlet of the large temperature difference hot water storage tank is connected to the primary side inlet of the geothermal heating heat exchange station. The outlet of the second water collector is connected to the inlet of the first water collector. The outlet of the first water collector is connected to the inlet of each heat exchange pipeline.

[0011] Furthermore, the primary outlet of the geothermal heating heat exchange station is connected to the heating network water supply pipeline via a heating network water pump.

[0012] Furthermore, the outlet of the solar collector and the outlet of the factory heat exchanger are connected by a pipeline and then by a bypass valve to the inlet of the large temperature difference hot water storage tank.

[0013] Furthermore, the outlet of the large temperature difference hot water storage tank is connected to the primary side inlet of the geothermal heating exchange station via a booster pump.

[0014] Furthermore, the outlet of the second water collector is connected to the inlet of the first water collector via a circulation pump.

[0015] Furthermore, it also includes a heating network return water pipe, which is connected to the inlet of the first water collection 2.

[0016] Furthermore, the large temperature difference hot water storage tank automatically stores water in layers according to temperature.

[0017] This invention discloses a heating method using a geothermal energy combined with a hot water storage tank, comprising the following steps:

[0018] During peak heat load periods, when the return water temperature of the heating network is below 10℃ and the upper water temperature of the large temperature difference hot water storage tank reaches 60℃ or above, the hot water in the large temperature difference hot water storage tank will be replenished to the outlet water of the geothermal heating heat exchange station to raise the water temperature of the heating network supply.

[0019] During periods of low heat load, solar collectors and factory heat exchangers are used to heat the water supply network through geothermal heating exchange stations, while excess heat is added to the bottom of large temperature difference hot water storage tanks.

[0020] Furthermore, it also includes:

[0021] When there is sufficient solar radiation, the cooling water of the geothermal heating unit is heated by the solar collector and then injected into the large temperature difference hot water storage tank. The hot water output from the factory heat exchanger enters the bottom of the large temperature difference hot water storage tank.

[0022] Furthermore, the upper layer of the large temperature difference hot water storage tank stores high-temperature water at a temperature of 40-80℃, while the lower layer stores low-temperature water at a temperature of 10-40℃.

[0023] The present invention has the following beneficial effects:

[0024] The geothermal energy combined hot water storage tank heating system and method described in this invention, in specific operation, improves the overall thermal efficiency by 15%-20% compared to traditional geothermal heating systems through temperature stratification storage in the large temperature difference hot water storage tank and combined heat supplementation from multiple heat sources. Simultaneously, it can cope with heat load fluctuations of 30%-20%, and the heat storage capacity of the large temperature difference hot water storage tank can meet the continuous heating demand for approximately 2 hours during peak heat load periods. Furthermore, the geothermal heat exchange unit includes several heat exchange pipelines installed within the geothermal well to achieve efficient heat storage and flexible allocation, improving the system's adaptability to load fluctuations and overall energy utilization. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a structural diagram of the present invention.

[0027] Among them, 1 is the heat exchange pipeline, 2 is the first water collector, 3 is the first water outlet, 4 is the second water outlet, 5 is the geothermal heating heat exchange station, 6 is the second water collector, 7 is the large temperature difference hot water storage tank, 8 is the solar collector, 9 is the factory heat exchanger, 10 is the booster pump, 11 is the heating network water pump, 12 is the circulation pump, and 13 is the intelligent control system. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0030] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0031] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0032] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0033] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0036] As is generally known, geothermal heating exchange stations are the core facilities of geothermal energy heating systems, responsible for converting geothermal energy into heat energy suitable for users and distributing it to buildings through secondary pipe networks.

[0037] Core components

[0038] Plate heat exchangers: Composed of corrugated metal plates, the heat source fluid (geothermal water) and the user-side fluid (circulating water) flow in opposite directions, efficiently transferring heat through the plates. Shell-and-tube heat exchangers: Geothermal water flows inside the tubes, while the user-side fluid flows inside the shell; heat is transferred through the tube walls, suitable for high-temperature and high-pressure scenarios.

[0039] Circulation pump: Drives the circulation of user-side water between the heat exchanger and the user's piping network, ensuring continuous heat transfer. Make-up water pump and water tank: Replenish water lost due to evaporation and leakage, maintaining normal operating pressure.

[0040] Control system: Real-time monitoring of parameters such as temperature, pressure, and flow rate, automatic adjustment of pump operating frequency, and realization of climate-compensated energy-saving control (adjusting supply and return water temperatures according to outdoor temperature) and time-sharing and zone-based energy-saving control.

[0041] Auxiliary equipment: dirt separator (filters impurities), meter (counts heat supply), control valve (regulates flow and pressure), and power distribution equipment (controls pump operation).

[0042] Example 1

[0043] The geothermal energy combined hot water storage tank heating system of the present invention includes a geothermal heat exchange unit, a large temperature difference hot water storage tank 7, a geothermal heating heat exchange station 5, a second water collector 6, a heating network water supply pipeline, a solar collector 8, and a factory heat exchanger 9. The geothermal heat exchange unit includes several heat exchange pipes 1 installed in the geothermal well; the first outlet 3 of each heat exchange pipe 1 is connected to the inlet of the large temperature difference hot water storage tank 7 and the primary side inlet of the geothermal heating heat exchange station 5, and the second outlet 4 of each heat exchange pipe 1 is connected to the inlet of the second water collector 6. The primary outlet of the heating heat exchange station 5 is connected to the heating network water supply pipeline; the outlet of the solar collector 8 and the outlet of the factory heat exchanger 9 are connected to the secondary inlet of the geothermal heating heat exchange station 5 through a pipeline; the secondary outlet of the geothermal heating heat exchange station 5 is connected to the inlet of the large temperature difference hot water storage tank 7; the outlet of the large temperature difference hot water storage tank 7 is connected to the primary inlet of the geothermal heating heat exchange station 5; the outlet of the second water collector 6 is connected to the inlet of the first water collector 2; and the outlet of the first water collector 2 is connected to the inlet of each heat exchange pipeline 1.

[0044] Accordingly, the heating method of the geothermal energy combined hot water storage tank of the present invention is based on the heating system of the geothermal energy combined hot water storage tank as described in claim 1, and includes the following steps:

[0045] During peak heat load, when the return water temperature of the heating network is below 10℃ and the upper water temperature of the large temperature difference hot water storage tank 7 reaches 60℃ or above, the hot water in the large temperature difference hot water storage tank 7 will be supplemented to the outlet water of the geothermal heating heat exchange station 5 to raise the water temperature of the heating network supply.

[0046] During periods of low heat load, the solar collector 8 and the factory heat exchanger 9 are used to heat the water supply network through the geothermal heating exchange station 5, while the excess heat is supplemented to the bottom of the large temperature difference hot water storage tank 7.

[0047] Example 2

[0048] To further improve this application, the geothermal energy combined hot water storage tank heating system of the present invention includes a geothermal energy heat exchange unit, a hot water storage tank unit, a first water collector 2, a first water outlet 3, a second water outlet 4, a geothermal heating heat exchange station 5, a second water collector 6, a large temperature difference hot water storage tank 7, a solar collector 8, a factory heat exchanger 9, a booster pump 10, a heating network water pump 11, a circulation pump 12, and an intelligent control system 13;

[0049] The geothermal energy heat exchange unit includes several heat exchange pipelines 1 installed in the geothermal well;

[0050] The first outlet 3 of each heat exchange pipeline 1 is connected to the inlet of the large temperature difference hot water storage tank 7 and the primary side inlet of the geothermal heating heat exchange station 5. The second outlet 4 of each heat exchange pipeline 1 is connected to the inlet of the second water collector 6. The primary side outlet of the geothermal heating heat exchange station 5 is connected to the heating network water supply pipeline via the heating network water pump 11. The outlet of the solar collector 8 and the outlet of the factory heat exchanger 9 are connected to the secondary side inlet of the geothermal heating heat exchange station 5 through a pipeline. The secondary side outlet of the geothermal heating heat exchange station 5 is connected to the inlet of the large temperature difference hot water storage tank 7. The outlet of the solar collector 8 and the outlet of the factory heat exchanger 9 are connected to the inlet of the large temperature difference hot water storage tank 7 through a bypass valve.

[0051] The outlet of the large temperature difference hot water storage tank 7 is connected to the primary side inlet of the geothermal heating heat exchange station 5 via the booster pump 10. The outlet of the second water collector 6 is connected to the inlet of the first water collector 2 via the circulation pump 12. The outlet of the first water collector 2 is connected to the inlet of each heat exchange pipeline 1. The heat network return water pipeline is connected to the inlet of the first water collector 2.

[0052] The large temperature difference hot water storage tank 7 automatically stores water in layers according to temperature, with the upper layer storing high-temperature water (40-80℃) and the lower layer storing low-temperature water (10-40℃).

[0053] Geothermal heating heat exchange station 5 and large temperature difference hot water storage tank 7 operate in coordination: During normal heating, the hot water output from the first outlet 3 of heat exchange pipeline 1 is preferentially supplied to geothermal heating heat exchange station 5, and excess heat energy is stored in large temperature difference hot water storage tank 7 through parallel pipelines.

[0054] Multi-heat source joint regulation: When solar radiation is sufficient, the cooling water of the geothermal heating unit is heated by the solar collector 8 and then injected into the large temperature difference hot water storage tank 7 to increase the heat storage temperature; the hot water output from the factory heat exchanger 9 enters the bottom of the large temperature difference hot water storage tank 7 to form a cascade heat supplement.

[0055] During peak heat load periods, the high-temperature water from the large temperature difference hot water storage tank 7 is mixed with the outlet water from the geothermal heating heat exchange station 5 to supply heat to the outside, thereby increasing the water temperature at the user end of the heating network. During off-peak heat load periods, the number of operating groups of heat exchange pipeline 1 is reduced, and excess heat energy is stored in the large temperature difference hot water storage tank 7.

[0056] The solar collector 8 is a flat-plate collector. The high-temperature hot water it heats is heated by the geothermal heating exchange station 5 to heat the heating network water supply. After cooling, it is stored in the large temperature difference hot water storage tank 7. The factory's waste heat is also heated by the geothermal heating exchange station 5 to heat the heating network water supply. After cooling, it is stored in the large temperature difference hot water storage tank 7.

[0057] The working process of this invention is as follows:

[0058] During peak heat load, when the return water temperature of the heating network is below 10℃ and the upper water temperature of the large temperature difference hot water storage tank 7 reaches 60℃ or above, the intelligent control system 13 starts the booster pump 10 to replenish the hot water in the large temperature difference hot water storage tank 7 to the outlet water of the geothermal heating heat exchange station 5, thereby raising the water temperature of the heating network supply.

[0059] During periods of low heat load, solar collectors 8 and factory heat exchangers 9 are used to heat the water supply to the heating network through the geothermal heating exchange station 5. At the same time, excess heat is added to the bottom of the large temperature difference hot water storage tank 7, and the stored heat energy is used to cope with peak heat load.

[0060] The intelligent control system 13 collects the outlet water temperature and flow rate of each heat exchange pipeline 1 and the water temperature distribution of the large temperature difference hot water storage tank 7 every 10 minutes. It adjusts the opening of the electric valve at the heat exchange outlet according to the heat load distribution to keep the heat storage efficiency of the large temperature difference hot water storage tank 7 above 85%.

[0061] It should be noted that this invention can significantly improve thermal energy utilization. Through temperature-layered storage in the large temperature difference hot water storage tank 7 and combined heating from multiple heat sources, the overall thermal efficiency of the system is 15%-20% higher than that of traditional geothermal heating systems. Simultaneously, it can cope with heat load fluctuations of 30%-20%, and the heat storage capacity of the large temperature difference hot water storage tank 7 can meet the continuous heating demand for approximately 2 hours during peak heat load periods. Furthermore, through data fusion and control strategy optimization, the coordinated optimization of group operation of heat exchange pipeline 1 and heat storage scheduling is achieved, reducing the cost of manual intervention. When the ambient temperature drops below -10℃, the hot water output from the second outlet 4 is automatically used to supplement the heat to the second water collector 6, avoiding the risk of freezing and cracking.

[0062] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0063] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0064] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A heating system combining geothermal energy and a hot water storage tank, characterized in that, It includes a geothermal heat exchange unit, a large temperature difference hot water storage tank (7), a geothermal heating heat exchange station (5), a second water collector (6), a heating network water supply pipeline, a solar collector (8), and a factory heat exchanger (9). The geothermal heat exchange unit includes several heat exchange pipelines (1) installed in the geothermal well. The first outlet (3) of each heat exchange pipeline (1) is connected to the inlet of the large temperature difference hot water storage tank (7) and the primary side inlet of the geothermal heating heat exchange station (5). The second outlet (4) of each heat exchange pipeline (1) is connected to the inlet of the second water collector (6). The primary side outlet of the geothermal heating heat exchange station (5) is connected to the heating network water supply pipeline. The outlet of the solar collector (8) and the outlet of the factory heat exchanger (9) are connected to the secondary side inlet of the geothermal heating heat exchange station (5) through a pipeline. The secondary side outlet of the geothermal heating heat exchange station (5) is connected to the inlet of the large temperature difference hot water storage tank (7). The outlet of the large temperature difference hot water storage tank (7) is connected to the primary side inlet of the geothermal heating heat exchange station (5). The outlet of the second water collector (6) is connected to the inlet of the first water collector (2). The outlet of the first water collector (2) is connected to the inlet of each heat exchange pipeline (1).

2. The heating system of the geothermal energy combined hot water storage tank according to claim 1, characterized in that, The primary outlet of the geothermal heating exchange station (5) is connected to the heating network water supply pipeline via the heating network water pump (11).

3. The heating system of the geothermal energy combined hot water storage tank according to claim 1, characterized in that, The outlet of the solar collector (8) and the outlet of the factory heat exchanger (9) are connected by a pipeline and then by a bypass valve to the inlet of the large temperature difference hot water storage tank (7).

4. The heating system of the geothermal energy combined hot water storage tank according to claim 1, characterized in that, The outlet of the large temperature difference hot water storage tank (7) is connected to the primary side inlet of the geothermal heating exchange station (5) via a booster pump (10).

5. The heating system of the geothermal energy combined hot water storage tank according to claim 1, characterized in that, The outlet of the second water collector (6) is connected to the inlet of the first water collector (2) via the circulation pump (12).

6. The heating system of the geothermal energy combined hot water storage tank according to claim 1, characterized in that, It also includes a heat network return water pipe, which is connected to the inlet of the first water collector (2).

7. The heating system of the geothermal energy combined hot water storage tank according to claim 1, characterized in that, Large temperature difference hot water storage tank (7) automatically stores water in layers according to temperature.

8. A heating method using a geothermal energy combined with a hot water storage tank, characterized in that, The heating system based on the geothermal energy combined hot water storage tank as described in claim 1 includes the following steps: During peak heat load, when the return water temperature of the heating network is below 10°C and the upper water temperature of the large temperature difference hot water storage tank (7) reaches 60°C or above, the hot water in the large temperature difference hot water storage tank (7) will be supplemented to the outlet water of the geothermal heating heat exchange station (5) to raise the water temperature of the heating network supply. When the heat load is low, the solar collector (8) and the factory heat exchanger (9) are used to heat the water supply of the heating network through the geothermal heating exchange station (5), and the excess heat is supplemented to the bottom of the large temperature difference hot water storage tank (7).

9. The heating method of the geothermal energy combined storage hot water tank according to claim 8, characterized in that, Also includes: When there is sufficient solar radiation, the cooling water of the geothermal heating unit is heated by the solar collector (8) and then injected into the large temperature difference hot water storage tank (7). The hot water output by the factory heat exchanger (9) enters the bottom of the large temperature difference hot water storage tank (7).

10. The heating method of the geothermal energy combined storage hot water tank according to claim 8, characterized in that, The upper layer of the large temperature difference hot water storage tank (7) stores high-temperature water at a temperature of 40-80℃, while the lower layer of the large temperature difference hot water storage tank (7) stores low-temperature water at a temperature of 10-40℃.

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