Cross-seasonal combined cooling heating and power supply system

Abstract

The utility model relates to the technical field of energy storage, and discloses a cross-season combined cooling, heating and power system which comprises an energy storage unit, a power generation unit, a cooling unit and a heating unit. The energy storage unit comprises an underground heat absorption section and an overground heat release section, and an energy storage working medium circulating in the energy storage unit is suitable for absorbing heat in the heat absorption section to be evaporated into gas to rise to the heat release section, and is suitable for being cooled into liquid in the heat release section to fall to the heat absorption section; the power generation unit is located underground and connected with the energy storage unit in a heat exchange mode. The cold supply unit is connected with the heat absorption section of the energy storage unit through a cold supply pipeline; and the heat supply unit is connected with the heat release section of the energy storage unit through a heat supply pipeline. The utility model provides a cross-seasonal combined cooling, heating and power supply system, which can meet the requirements of users on refrigeration in summer, heating or hot spring in winter and electricity utilization all the year round. And compared with an existing cross-seasonal cold storage system, the energy storage utilization rate is increased, dynamic balance of heat of the reservoir can be kept, and environmental protection benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a cross-seasonal combined cooling, heating and power supply system. Background Art

[0002] From the perspective of energy utilization, most of the existing cross-seasonal energy storage systems are mainly for cold storage and refrigeration utilization. Generally, cold storage boxes or buried pipe cold storage are used, but their cold storage capacity is limited and the energy supply form is single, which reduces the utilization efficiency of the energy storage system.

[0003] From the technical perspective, most of the existing cross-seasonal energy storage technologies only utilize natural cold, and a small part of the technologies utilize valley price cold storage, but the utilization rate of renewable energy is extremely low. Therefore, there is great room for improvement in the existing cross-seasonal energy storage technologies. Summary of the Utility Model

[0004] In view of this, the utility model provides a cross-seasonal combined cooling, heating and power supply system to solve the problem of low utilization rate of cross-seasonal energy storage.

[0005] In a first aspect, the utility model provides a cross-seasonal combined cooling, heating and power supply system, including an energy storage unit, a power generation unit, a cooling supply unit and a heating supply unit. The energy storage unit includes an endothermic section located underground and an exothermic section located above the ground. The energy storage working medium flowing in the energy storage unit is adapted to absorb heat and evaporate into a gas in the endothermic section and rise to the exothermic section, and is adapted to cool into a liquid in the exothermic section and drop to the endothermic section; the power generation unit is located underground and is in heat exchange connection with the energy storage unit; the cooling supply unit is connected to the endothermic section of the energy storage unit through a cooling supply pipeline; the heating supply unit is connected to the exothermic section of the energy storage unit through a heating supply pipeline.

[0006] In an optional implementation manner, the energy storage unit includes a plurality of gravity heat pipes arranged vertically. A part of the gravity heat pipe is located underground to form an endothermic section, and another part of the gravity heat pipe is located above the ground to form an exothermic section.

[0007] In an optional implementation manner, the energy storage unit includes a plurality of energy storage cylinders, and a plurality of gravity heat pipes are arranged in each energy storage cylinder.

[0008] In an optional implementation manner, the cooling supply pipeline is provided with a first control valve, and the first control valve is adapted to control the on-off of the cooling supply pipeline.

[0009] In an optional implementation manner, the heating supply pipeline is provided with a second control valve, and the second control valve is adapted to control the on-off of the heating supply pipeline.

[0010] In an optional implementation manner, the cooling supply unit includes a cooling supply heat exchanger, and the cooling supply heat exchanger is connected to the cooling supply pipeline.

[0011] In an alternative embodiment, the heating unit includes a heating heat exchanger and a heat pump, and both the heating heat exchanger and the heat pump are connected to the heating pipeline.

[0012] In an alternative embodiment, the power generation unit includes a thermovoltaic power generation device, and the thermovoltaic power generation device is connected to the user's power consumption end through a power line.

[0013] In an alternative embodiment, the thermovoltaic power generation device includes thermovoltaic power generation panels, and the thermovoltaic power generation panels include a positive plate and a negative plate. The positive plate is attached below the gravity heat pipe, and the negative plate is located below the positive plate.

[0014] In an alternative embodiment, the heat absorption section of the energy storage unit is located in an underground reservoir, and the temperature of the underground reservoir in winter is higher than the ambient temperature on the ground.

[0015] Advantageous effects:

[0016] The utility model provides a cold, heat and power cogeneration system with no interference and efficient energy storage utilization for medium-low temperature and medium-high temperature reservoir energy storage characteristics. In summer, it can provide cooling and power generation for users; in winter, it can provide heating, hot spring or power generation for users; in all seasons, according to the user's power consumption demand, the power generation unit can work and supply power at any time or for a long time to meet the user's power consumption demand. Thus, it ensures the user's cooling in summer, heating or hot spring in winter, and power consumption throughout the year. Compared with the existing seasonal cold energy storage system, it improves the energy storage utilization rate and has significant economic benefits. It has no interference or damage to the reservoir and can maintain the dynamic balance of the reservoir heat, having environmental benefits. Description of the drawings

[0017] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of a seasonal cold, heat and power cogeneration system according to an embodiment of the present utility model;

[0019] Figure 2 For Figure 1 It is a partial structural schematic diagram of the energy storage unit in the seasonal cold, heat and power cogeneration system shown;

[0020] Figure 3 It is an energy supply strategy diagram of a seasonal cold, heat and power cogeneration system according to an embodiment of the present utility model.

[0021] Description of the reference numerals:

[0022] 1. Energy storage unit; 11. Gravity heat pipe; 12. Energy storage cylinder; 2. Power generation unit; 21. Thermovoltaic power generation device; 3. Cooling unit; 31. Cooling pipeline; 32. First control valve; 33. Cooling heat exchanger; 4. Heating unit; 41. Heating pipeline; 42. Second control valve; 43. Heating heat exchanger; 44. Heat pump; 5. Underground reservoir; 6. Power consumption end; 7. Cooling consumption end; 8. Heating consumption end. Detailed implementation mode

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] The following combines Figures 1 to 3 , to describe the embodiments of the present utility model.

[0025] According to an embodiment of the present utility model, a cross-seasonal combined cooling, heating and power supply system is provided, which includes an energy storage unit 1, a power generation unit 2, a cooling unit 3 and a heating unit 4. The energy storage unit 1 includes an endothermic section located underground and an exothermic section located above ground. The energy storage working medium flowing in the energy storage unit 1 is adapted to absorb heat in the endothermic section and evaporate into a gas and rise to the exothermic section, and is adapted to cool into a liquid in the exothermic section and descend to the endothermic section; the power generation unit 2 is located underground, and the power generation unit 2 is in heat exchange connection with the energy storage unit 1; the cooling unit 3 is connected to the endothermic section of the energy storage unit 1 through a cooling pipeline 31; the heating unit 4 is connected to the exothermic section of the energy storage unit 1 through a heating pipeline 41.

[0026] After the energy storage working medium in the energy storage unit 1 absorbs heat underground, the energy storage working medium evaporates into a gas and rises to the exothermic section located above ground, and the energy storage working medium is heat-exchanged and condensed into a liquid and descends to the endothermic section located underground, and so on, storing the cold in winter underground for use as a cold source in summer.

[0027] The power generation unit 2 is used for generating electricity for power users.

[0028] The cooling pipeline 31 of the cooling unit 3 is connected to the endothermic section of the energy storage unit 1. Since the endothermic section of the energy storage unit 1 is located underground and the energy storage working medium in the endothermic section of the energy storage unit 1 is in a liquid state, part of the cooling pipeline 31 extends underground, and the liquid energy storage working medium flows in the cooling pipeline 31. In summer, the cold stored underground is used to cool the cooling pipeline 31, which can provide cooling for users.

[0029] The heat supply pipeline 41 of the heat supply unit 4 is connected to the heat release section of the energy storage unit 1. Since the heat release section of the energy storage unit 1 is located underground and the energy storage working medium in the heat release section of the energy storage unit 1 is in a gaseous state, the gaseous energy storage working medium flows in the heat supply pipeline 41. In winter, the heat in the heat release section of the energy storage unit 1 is transferred to the heat supply pipeline 41 for the domestic water or hot spring of users.

[0030] In summer, it realizes cooling and power generation for users; in winter, it realizes heating, hot spring or power generation for users; in all seasons, the power generation unit 2 is kept working and supplying power at any time or for a long time according to the electricity demand of users to meet the electricity demand of users. Thus, it ensures the cooling in summer, heating or hot spring in winter and the electricity demand throughout the year of users.

[0031] The heat absorption section of the energy storage unit 1 is located underground and is used to store cold energy. It is safer than other physical energy storage methods and is suitable for promotion at the cold, heat and electricity demand ends of park buildings.

[0032] In some embodiments, the energy storage unit 1 includes a plurality of vertically arranged gravity heat pipes 11. A part of the gravity heat pipe 11 is located underground to form a heat absorption section, and another part of the gravity heat pipe 11 is located above the ground to form a heat release section. A low-boiling-point organic working medium flows in the gravity heat pipe 11.

[0033] By setting the gravity heat pipe 11 and flowing a low-boiling-point organic working medium in the gravity heat pipe 11, it is ensured that the heat in the reservoir can be utilized. It is in a liquid state in the underground heat absorption section, can absorb heat underground and evaporate into a gaseous state, and rises along the gravity heat pipe 11 to the heat release section located above the ground. In winter, the heat release section absorbs cold and condenses into a liquid state, and descends along the gravity heat pipe 11 to the underground heat absorption section under the action of gravity, and so on in a cycle, continuously storing the cold in winter underground.

[0034] In some embodiments, as Figure 2 shown, the energy storage unit 1 includes a plurality of energy storage cylinders 12, and a plurality of gravity heat pipes 11 are arranged in each energy storage cylinder 12.

[0035] Specifically, the energy storage cylinder 12 serves as an installation bracket, and each gravity heat pipe 11 can be installed and fixed through the energy storage cylinder 12. The gravity heat pipe 11 is arranged along the gravity direction.

[0036] In some embodiments, the gravity heat pipes 11 are inserted into the underground reservoir 5 in a certain arrangement according to the actual needs of users, including but not limited to the 3×3 arrangement as Figure 2 shown.

[0037] In some embodiments, the cooling pipeline 31 is provided with a first control valve 32, and the first control valve 32 is adapted to control the on-off of the cooling pipeline 31.

[0038] Specifically, the cooling pipeline 31 is connected to the heat absorption section of the gravity heat pipe 11. In summer, the first control valve 32 is opened, and the liquid energy storage working medium in the gravity heat pipe 11 can flow into the cooling pipeline 31 to extract the cold energy stored underground across seasons for cooling users. In winter, the first control valve 32 is closed.

[0039] In some embodiments, the heating pipeline 41 is provided with a second control valve 42, and the second control valve 42 is adapted to control the on / off of the heating pipeline 41.

[0040] Specifically, the heating pipeline 41 is connected to the heat release section of the gravity heat pipe 11. In winter or summer, the second control valve 42 is opened, and the gaseous energy storage working medium in the gravity heat pipe 11 can flow into the heating pipeline 41 to extract the heat of the energy storage working medium for domestic hot water or hot spring use by users.

[0041] In some embodiments, the cooling unit 3 includes a cooling heat exchanger 33, and the cooling heat exchanger 33 is connected to the cooling pipeline 31.

[0042] By providing the cooling heat exchanger 33, the cooling pipeline 31 is connected to the cooling heat exchanger 33. In this way, the cooling heat exchanger 33 can extract the cold energy in the cooling pipeline 31 for users to use for cooling in summer. Specifically, the cooling heat exchanger 33 is connected to the cold - using end 7 of the user through a pipeline.

[0043] In some embodiments, the heating unit 4 includes a heating heat exchanger 43 and a heat pump 44, and both the heating heat exchanger 43 and the heat pump 44 are connected to the heating pipeline 41.

[0044] By providing the heating heat exchanger 43, the heating pipeline 41 is connected to the heating heat exchanger 43, and the heat in the heating pipeline 41 can be extracted for domestic hot water or hot spring use by users. Specifically, the heating heat exchanger 43 is connected to the heat - using end 8 of the user through a pipeline.

[0045] By providing the heat pump 44, the energy storage working medium in the heating pipeline 41 can be heated and raised in temperature to raise the temperature of domestic hot water or hot spring for users.

[0046] In some embodiments, the power generation unit 2 includes a thermoelectric power generation device 21, and the thermoelectric power generation device 21 is connected to the power - using end 6 of the user through a power line.

[0047] In some embodiments, the thermoelectric power generation device 21 includes a thermoelectric power generation panel, and the thermoelectric power generation panel includes a positive plate and a negative plate. The positive plate is attached to the lower part of the gravity heat pipe 11, and the negative plate is located below the positive plate.

[0048] Specifically, the positive plate of the thermovoltaic power generation panel is the heat release side, and the negative plate is the heat absorption side. The positive plate is attached to the bottom of the gravity heat pipe 11, and the coldness of the heat absorption section of the gravity heat pipe 11 is used to cool the positive plate of the thermovoltaic power generation panel. The negative plate of the thermovoltaic power generation panel is located below the positive plate and absorbs geothermal heat. This can increase the temperature difference between the positive and negative electrodes of the thermovoltaic power generation panel and improve the power generation efficiency.

[0049] In some embodiments, the heat absorption section of the energy storage unit 1 is located in the underground reservoir 5 , and the temperature of the underground reservoir 5 in winter is higher than the ambient temperature on the ground.

[0050] Specifically, the underground reservoir 5 includes an aquifer, a cave or rock soil.

[0051] In winter, the ambient temperature is lower than the reservoir temperature. The low-boiling-point working fluid in the heat absorption section of the gravity heat pipe 11 absorbs the heat in the reservoir and evaporates into a gaseous working fluid and rises to the heat release section. The heat release section is cooled by the ambient temperature, and its gaseous energy storage working fluid is then cooled into a liquid state and flows back to the heat absorption section at the bottom of the gravity heat pipe 11 along the pipe wall of the gravity heat pipe 11, completing a cycle. In this process, the coldness of the environment is stored in the reservoir for summer cooling. At the same time, the heat release section of the gravity heat pipe 11 has heat, which can be used for domestic hot water for users in summer and can be used for heating by heat pump 44 in winter. The bottom of the gravity heat pipe 11 has a temperature difference with the reservoir during the heat absorption and heat release process. The utility model attaches the thermovoltaic power generation device 21 to the bottom of the gravity heat pipe 11, and uses the temperature difference to generate electricity throughout the year. Thus, cross-seasonal combined heat and power generation is achieved.

[0052] The utility model provides a non-interference, energy efficient combined heat and power system for medium-low temperature and medium-high temperature reservoir energy storage characteristics. The heat absorption section of the gravity heat pipe 11 adopted by the utility model is placed in the reservoir, and the heat release section is placed outside the reservoir. The thermovoltaic power generation device 21 is used to generate electricity, which can maximize the utilization of the heat of the gravity heat pipe 11. Compared with the existing cross-season cold storage system, it greatly improves the energy storage utilization rate and has significant economic benefits. There is no interference or damage to the reservoir, and the dynamic balance of the reservoir heat can be maintained, which has environmental benefits.

[0053] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cross-seasonal combined cooling, heating and power system, characterized in that: include: An energy storage unit (1), the energy storage unit (1) comprising a heat absorption section located underground and a heat release section located above ground, the energy storage medium flowing in the energy storage unit (1) being suitable for absorbing heat in the heat absorption section to evaporate into gas and rise to the heat release section, and being suitable for cooling into liquid in the heat release section and falling to the heat absorption section; A power generation unit (2), the power generation unit (2) is located underground, and the power generation unit (2) and the energy storage unit (1) are connected to each other for heat exchange; A cooling unit (3), the cooling unit (3) being connected to the heat absorption section of the energy storage unit (1) via a cooling pipeline (31); A heat supply unit (4), the heat supply unit (4) being connected to the heat release section of the energy storage unit (1) via a heat supply pipeline (41).

2. The inter-seasonal combined cooling, heating and power system according to claim 1, characterized in that: The energy storage unit (1) comprises a plurality of vertically arranged gravity heat pipes (11), a portion of the gravity heat pipes (11) being located underground to form the heat absorption section, and another portion of the gravity heat pipes (11) being located above ground to form the heat release section.

3. The inter-seasonal combined cooling, heating and power system according to claim 2, characterized in that: The energy storage unit (1) comprises a plurality of energy storage cylinders (12), each of which is provided with a plurality of gravity heat pipes (11).

4. The inter-seasonal combined cooling, heating and power system according to any one of claims 1 to 3, characterized in that: The cooling pipeline (31) is provided with a first control valve (32), and the first control valve (32) is suitable for controlling the on-off of the cooling pipeline (31).

5. The inter-seasonal combined cooling, heating and power system according to any one of claims 1 to 3, characterized in that: The heating pipeline (41) is provided with a second control valve (42), and the second control valve (42) is suitable for controlling the on-off of the heating pipeline (41).

6. The inter-seasonal combined cooling, heating and power system according to any one of claims 1 to 3, characterized in that: The cooling unit (3) comprises a cooling heat exchanger (33), and the cooling heat exchanger (33) is connected to the cooling pipeline (31).

7. The inter-seasonal combined cooling, heating and power system according to any one of claims 1 to 3, characterized in that: The heating unit (4) comprises a heating heat exchanger (43) and a heat pump (44), and the heating heat exchanger (43) and the heat pump (44) are both connected to the heating pipeline (41).

8. The inter-seasonal combined cooling, heating and power system according to claim 2 or 3, characterized in that: The power generation unit (2) comprises a thermovoltaic power generation device (21), and the thermovoltaic power generation device (21) is connected to a user's power consumption terminal (6) via a power line.

9. The inter-seasonal combined cooling, heating and power system according to claim 8, characterized in that: The thermovoltaic power generation device (21) comprises a thermovoltaic power generation plate, and the thermovoltaic power generation plate comprises a positive electrode plate and a negative electrode plate. The positive electrode plate is attached to the bottom of the gravity heat pipe (11), and the negative electrode plate is located below the positive electrode plate.

10. The inter-seasonal combined cooling, heating and power system according to any one of claims 1 to 3, characterized in that: The heat absorption section of the energy storage unit (1) is located in an underground reservoir (5), and the temperature of the underground reservoir (5) in winter is higher than the ambient temperature on the ground.

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