A heat and electricity collaborative energy storage and supply system for a zero-carbon park

Abstract

The application provides a heat and electricity collaborative energy storage and supply system for a zero-carbon park, comprising: an electric and thermal input unit configured to receive electric energy and thermal energy from renewable energy and / or industrial processes; an energy storage unit connected to the electric and thermal input unit and configured to store the input electric energy and thermal energy in the form of thermal energy; and an electric and thermal output unit connected to the energy storage unit and configured to output the stored energy in the form of electric energy or thermal energy to an energy consumption terminal. The heat and electricity collaborative energy storage and supply system for the zero-carbon park can realize collaborative storage and flexible allocation of electric energy and thermal energy, and improve the flexibility, reliability and economy of the park energy system.

Description

Technical Field

[0001] This application relates to the field of energy utilization technology, and more specifically, to a thermoelectric co-storage and supply system for zero-carbon industrial parks. Background Technology

[0002] In achieving carbon neutrality, zero-carbon industrial parks generally rely on renewable energy sources such as solar and wind power as their primary energy supply. However, the output of renewable energy is characterized by significant randomness and intermittency, leading to potential power curtailment during peak power generation periods and reliance on external power grids or traditional fossil fuels for supplementation during off-peak periods, making it difficult to achieve efficient energy self-balancing. Simultaneously, industrial production demands diverse, continuous, and high-quality heat and steam, particularly requiring a stable supply of industrial steam at multiple pressure levels. Currently, existing technologies primarily focus on the conversion or storage of single energy forms, such as independent electrical or thermal energy storage, lacking multi-energy flow coupling systems capable of coordinating the dispatch of electricity, heat, and steam. This single-energy conversion model cannot fully integrate the multi-energy complementarity within the park and struggles to flexibly respond to renewable energy fluctuations and diverse load demands, hindering the overall energy efficiency improvement and large-scale absorption of renewable energy in zero-carbon industrial parks. Therefore, a system capable of coordinating heat and power storage and flexible allocation is urgently needed to enhance the flexibility, reliability, and economy of the park's energy system. Summary of the Invention

[0003] This application provides at least one thermoelectric co-storage and supply system for zero-carbon parks, which can realize the co-storage and flexible allocation of electrical and thermal energy, thereby improving the flexibility, reliability and economy of the park's energy system.

[0004] This application provides a thermoelectric co-generation energy storage and supply system for zero-carbon parks, comprising: an electrothermal input unit for receiving electrical and thermal energy generated from renewable energy and / or industrial processes; an energy storage unit connected to the electrothermal input unit for storing the input electrical and thermal energy as thermal energy; and an electrothermal output unit connected to the energy storage unit for outputting the energy stored in the energy storage unit to an energy-consuming terminal in the form of electrical or thermal energy.

[0005] In one alternative embodiment, the energy storage unit is configured to store thermal energy in the form of high-temperature steam.

[0006] In one optional embodiment, the energy storage unit includes a high-temperature heat pump, a high-temperature thermal storage tank, and a low-temperature thermal storage tank. The high-temperature heat pump includes an evaporator and a compressor connected in series. The liquid outlet of the low-temperature thermal storage tank and the steam inlet of the high-temperature thermal storage tank are respectively connected to the liquid inlet and liquid outlet of the evaporator. The evaporator is used to heat the low-temperature water flowing from the low-temperature thermal storage tank to the high-temperature thermal storage tank into high-temperature steam using the input heat energy. The compressor is used to consume the input electrical energy to compress the low-temperature water flowing from the low-temperature thermal storage tank to the high-temperature thermal storage tank into high-temperature steam.

[0007] In one optional embodiment, the high-temperature steam includes high-temperature high-pressure steam and high-temperature low-pressure steam; the high-temperature heat storage tank includes a high-temperature high-pressure heat storage zone and a high-temperature low-pressure heat storage zone, wherein the high-temperature high-pressure heat storage zone is used to store high-temperature high-pressure steam and the high-temperature low-pressure heat storage zone is used to store high-temperature low-pressure steam.

[0008] In one optional embodiment, the energy storage unit further includes a steam input pipeline connected to the steam inlet of the high-temperature thermal storage tank for inputting high-temperature steam generated during industrial processes into the high-temperature thermal storage tank.

[0009] In one optional embodiment, the electric heat output unit includes a steam turbine connected to the steam outlet of the high-temperature heat storage tank, used to generate electricity using the high-temperature steam output from the high-temperature heat storage tank to supply electricity to the user terminal.

[0010] In one optional embodiment, the electric heating output unit further includes a condenser and a working fluid pump, wherein the condenser and the working fluid pump are connected in series between the steam outlet of the steam turbine and the liquid inlet of the cryogenic heat storage tank.

[0011] In one optional embodiment, the electric heating output unit includes a steam output pipeline connected to the steam outlet of the high-temperature heat storage tank, for directly supplying the high-temperature steam output from the high-temperature heat storage tank to the steam-using terminal.

[0012] The above-mentioned technical solution of this application has the following beneficial technical effects: The co-generation energy storage and supply system for zero-carbon parks in this application embodiment achieves flexible conversion and efficient storage across energy forms by deeply coupling electrical energy and thermal energy and uniformly converting them into thermal energy for storage. This effectively solves the contradiction between the intermittency of renewable energy output and the continuity of industrial energy demand. At the same time, the system can flexibly decouple and output electrical energy or thermal energy of different qualities according to demand, significantly improving the overall flexibility, reliability and economy of the zero-carbon park energy system, and promoting the large-scale consumption and efficient self-balancing of renewable energy.

[0013] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this application and, together with the specification, serve to explain the technical solutions of this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This illustration shows a schematic diagram of a co-generation energy storage and supply system for zero-carbon industrial parks, provided in an embodiment of this application. In the diagram: 1. PV / T panel; 2. Wind turbine; 3. High-temperature heat pump; 4. High-temperature thermal storage tank; 5. Low-temperature thermal storage tank; 6. Steam input pipeline; 7. Steam turbine; 8. Condenser; 9. Working fluid pump; 10. Steam output pipeline; 11. Steam terminal; 12. Electricity terminal. Detailed Implementation

[0016] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0017] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0018] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] refer to Figure 1 This application provides a thermoelectric co-generation energy storage and supply system for zero-carbon industrial parks, comprising: an electrothermal input unit for receiving electrical and thermal energy generated from renewable energy sources and / or industrial processes; an energy storage unit connected to the electrothermal input unit for storing the input electrical and thermal energy as thermal energy; and an electrothermal output unit connected to the energy storage unit for outputting the energy stored in the energy storage unit to energy-consuming terminals in the form of electrical or thermal energy. In operation, the system first receives electrical and thermal energy generated from renewable energy sources (such as photovoltaic and wind power) or waste heat from industrial processes through the electrothermal input unit; subsequently, the energy storage unit stores the input electrical and thermal energy as thermal energy; finally, the electrothermal output unit flexibly outputs the energy stored in the energy storage unit in the form of electrical or thermal energy according to the real-time needs of the energy-consuming terminals, thereby achieving coordinated supply of electricity and heat loads to the park.

[0022] The co-generation energy storage and supply system for zero-carbon parks in this application embodiment achieves flexible conversion and efficient storage across energy forms by deeply coupling electrical energy and thermal energy and uniformly converting them into thermal energy for storage. This effectively solves the contradiction between the intermittency of renewable energy output and the continuity of industrial energy demand. At the same time, the system can flexibly decouple and output electrical energy or thermal energy of different qualities according to demand, significantly improving the overall flexibility, reliability and economy of the zero-carbon park energy system, and promoting the large-scale consumption and efficient self-balancing of renewable energy.

[0023] In some embodiments, the energy storage unit is configured to store thermal energy in the form of high-temperature steam. During use, the system can receive and convert input electrical and thermal energy, transforming them into high-temperature steam and storing it in the thermal storage device. When output is required, the stored high-temperature steam can either drive power generation equipment to convert it into electrical energy or be directly used as a high-quality heat source to supply heat or industrial steam terminals 11. Of course, in other embodiments, the energy storage unit can also use other forms to store thermal energy.

[0024] In some embodiments, the energy storage unit includes a high-temperature heat pump 3, a high-temperature heat storage tank 4, and a low-temperature heat storage tank 5. The high-temperature heat pump 3 includes an evaporator and a compressor connected in series. The liquid outlet of the low-temperature heat storage tank 5 and the steam inlet of the high-temperature heat storage tank are respectively connected to the liquid inlet and liquid outlet of the evaporator. The evaporator is used to heat the low-temperature water flowing from the low-temperature heat storage tank 5 to the high-temperature heat storage tank 4 into high-temperature steam using the input heat energy. The compressor is used to compress the low-temperature water flowing from the low-temperature heat storage tank 5 to the high-temperature heat storage tank 4 into high-temperature steam by consuming the input electrical energy. During use, the water (or working fluid) in the low-temperature heat storage tank 5 flows through the evaporator and / or compressor of the high-temperature heat pump 3, where it is heated and compressed into high-temperature steam using the input heat energy or by consuming the input electrical energy. This steam is then transported to the high-temperature heat storage tank 4 for storage, thereby converting electrical energy and heat energy together into high-quality heat energy for storage.

[0025] In some embodiments, high-temperature steam includes high-temperature high-pressure steam and high-temperature low-pressure steam; the high-temperature heat storage tank 4 includes a high-temperature high-pressure heat storage zone and a high-temperature low-pressure heat storage zone. The high-temperature high-pressure heat storage zone is used to store high-temperature high-pressure steam, and the high-temperature low-pressure heat storage zone is used to store high-temperature low-pressure steam. During use, the system can convert input energy into high-temperature steam and store it in independent high-pressure and low-pressure zones within the high-temperature heat storage tank 4 according to its pressure level. When outputting energy, the system can flexibly extract high-temperature high-pressure steam or high-temperature low-pressure steam from the corresponding heat storage zone for supply according to the specific steam pressure requirements of the energy-consuming terminal. By storing steam according to pressure levels, the system can accurately match the diversified and high-quality demands for steam at different pressure levels in industrial production, thereby significantly improving the adaptability and reliability of the supply. At the same time, the graded storage structure facilitates the refined management and scheduling of energy of different qualities, enhances the system's flexibility in dealing with complex loads, and provides a key guarantee for achieving customized and stable industrial steam supply. It should be understood that pressure detection devices can be installed on the pipeline to facilitate the determination of the high-temperature steam pressure.

[0026] In some embodiments, the energy storage unit further includes a steam input pipeline 6, which is connected to the steam inlet of the high-temperature thermal storage tank 4, for inputting high-temperature steam generated during industrial processes into the high-temperature thermal storage tank 4. During use, high-temperature steam directly generated during industrial production in the park can be directly transported and introduced into the high-temperature thermal storage tank 4 through the steam input pipeline 6, thereby being stored together with steam generated from electrical energy or waste heat, without needing intermediate conversion or cooling processes.

[0027] In some embodiments, the electrothermal input unit includes a PV / T panel 1 (photovoltaic-thermal integrated device) and a wind turbine 2. During operation, the PV / T panel 1 transfers heat energy to the evaporator, and the wind turbine 2 transfers electrical energy to the compressor. Of course, in other embodiments, the electrothermal input unit can also be other renewable energy systems.

[0028] In some embodiments, the electrothermal output unit includes a steam turbine 7 connected to the steam outlet of the high-temperature thermal storage tank 4, used to generate electricity from the high-temperature steam output from the high-temperature thermal storage tank 4 to supply power to the power consumption terminal 12. When there is a demand for electricity, the system can extract the high-temperature steam stored in the high-temperature thermal storage tank 4 to drive the steam turbine 7 connected to the generator to rotate and do work, thereby efficiently converting the stored thermal energy (thermal energy and pressure energy of steam) into electrical energy and delivering it to the power consumption terminal 12 in the park.

[0029] In some embodiments, the electrothermal output unit further includes a condenser 8 and a working fluid pump 9, which are connected in series between the steam outlet of the turbine 7 and the liquid inlet of the cryogenic heat storage tank 5. After the turbine 7 completes its power generation, the discharged low-temperature, low-pressure exhaust steam enters the condenser 8, where it is cooled and condensed into liquid water. Subsequently, the working fluid pump 9 pressurizes this condensate and pumps it back into the cryogenic heat storage tank 5, completing the entire cycle of the working medium (water) and preparing for continuous system operation. By setting up the condenser 8 and the working fluid pump 9, the system can form a complete thermodynamic cycle loop, ensuring that the working medium can be efficiently and in a closed loop recovered and reused, reducing the system's working fluid loss and water treatment requirements, and helping to improve the sustainability and economy of operation. At the same time, releasing waste heat through condensation and recovering high-quality condensate also helps to optimize the system's thermal efficiency and energy utilization rate.

[0030] In some embodiments, the electric heating output unit includes a steam output pipeline 10, which is connected to the steam outlet of the high-temperature thermal storage tank 4, for directly supplying the high-temperature steam output from the high-temperature thermal storage tank 4 to the steam-using terminal 11. During operation, when the park has a need for heating or industrial steam, the system can bypass the power generation stage and directly transport the high-temperature steam stored in the high-temperature thermal storage tank 4 to the steam-using terminal 11 through the steam output pipeline 10, for example, for process heating, heating, or providing power in industrial production.

[0031] In some embodiments, the energy-consuming terminal includes a steam-consuming terminal 11 and an electricity-consuming terminal 12. The steam-consuming terminal 11 can receive steam or other types of heat energy output from the high-temperature thermal storage tank 4, and the electricity-consuming terminal 12 can receive electrical energy generated by the steam turbine 7. Of course, in other embodiments, the energy-consuming terminal can be any other suitable terminal.

[0032] In some embodiments, the system can operate in at least one of the following modes: Electric / thermal-electric mode: The input electrical energy and / or thermal energy is converted into steam for storage and then generated by the steam turbine 7 to output electrical energy; Steam-to-steam mode: The input steam is directly stored and supplied to the steam terminal 11; Electricity / Heat-Steam Mode: Converts input electrical energy and / or heat energy into steam and stores it, directly supplying it to steam-using terminal 11; Steam-electric mode: The input steam is stored and generated by the steam turbine 7 to output electrical energy.

[0033] Example 1 Electric / Heat-Electric Mode: The heat and electricity generated by heat sources and power sources such as PV / T panel 1 and wind turbine generator 2 are respectively input to the evaporator and compressor of high-temperature heat pump 3. The low-temperature water in low-temperature storage tank 5 enters the condenser 8 of high-temperature heat pump 3 and absorbs heat to transform into high-temperature low-pressure steam. Alternatively, the low-temperature water enters the compressor of high-temperature heat pump 3 and transforms into high-temperature low-pressure steam. The high-temperature low-pressure steam enters high-temperature storage tank 4 and is stored in the high-temperature low-pressure heat storage area of ​​high-temperature storage tank 4. The high-temperature low-pressure steam generates heat energy from the outlet of high-temperature storage tank 4 and is transported to the steam consumption terminal 11.

[0034] Example 2 Steam-to-steam mode: The heat energy (in the form of high-temperature, low-pressure steam) generated by the additional heat source (plant) enters the high-temperature heat storage tank 4 through the steam input pipeline 6 and is stored in the high-temperature, low-pressure heat storage area of ​​the high-temperature heat storage tank 4. The high-temperature, low-pressure steam generates heat energy from the outlet of the high-temperature heat storage tank 4 and is delivered to the steam-using terminal 11.

[0035] Example 3 Electricity / Heat-Steam Mode: Heat and electricity generated by heat sources and power sources such as PV / T panel 1 and wind turbine generator 2 are input to the evaporator and compressor of high-temperature heat pump 3, respectively. Low-temperature water from low-temperature storage tank 5 enters the condenser 8 of high-temperature heat pump 3, absorbing heat and transforming into high-temperature, high-pressure steam. Alternatively, the low-temperature water enters the evaporator of high-temperature heat pump 3 and transforms into high-temperature, high-pressure steam. This high-temperature, high-pressure steam enters high-temperature storage tank 4 and is stored in its high-temperature, high-pressure storage zone. The high-temperature, high-pressure steam exits high-temperature storage tank 4 and enters turbine 7 to generate electricity, which is then delivered to the power consumption terminal 12. The high-temperature, high-pressure steam is depressurized to high-temperature, low-pressure steam. This high-temperature, low-pressure steam exits turbine 7 and enters condenser 8, where it is condensed into low-temperature water. The low-temperature water then enters working fluid pump 9 and is pumped to low-temperature storage tank 5 for storage, completing the cycle.

[0036] Example 4 Steam-Electricity Mode: Heat (in the form of high-temperature, high-pressure steam) generated by an additional heat source (factory) enters the high-temperature heat storage tank 4 and is stored in the high-temperature, high-pressure heat storage zone of the high-temperature heat storage tank 4. The high-temperature, high-pressure steam enters the turbine 7 from the outlet of the high-temperature heat storage tank 4 to generate electricity, which is then delivered to the power consumption terminal 12. The high-temperature, high-pressure steam is depressurized to high-temperature, low-pressure steam. The high-temperature, low-pressure steam enters the condenser 8 from the outlet of the turbine 7 and is condensed into low-temperature water. The low-temperature water enters the working fluid pump 9 from the condenser 8 and is pumped by the working fluid pump 9 to the low-temperature heat storage tank 5 for storage, completing the cycle.

[0037] It should be noted that the above implementation cases 1-4 are only feasible implementation cases of electrothermal decoupling. In practical applications, the system can also have multiple electrical / thermal input methods and can supply thermal energy and electrical energy simultaneously.

[0038] One or more embodiments in this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this specification should be included within the protection scope of this application.

[0039] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A co-generation energy storage and supply system for zero-carbon industrial parks, characterized in that, include: An electric heating input unit is used to receive electrical and thermal energy generated from renewable energy sources and / or industrial processes; An energy storage unit, connected to the electrothermal input unit, is used to store the input electrical energy and thermal energy as thermal energy. An electric heating output unit, connected to the energy storage unit, is used to output the energy stored in the energy storage unit to the energy-consuming terminal in the form of electrical energy or thermal energy.

2. The co-generation and energy storage and supply system for zero-carbon industrial parks according to claim 1, characterized in that, The energy storage unit is configured to store thermal energy in the form of high-temperature steam.

3. The co-generation energy storage and supply system for zero-carbon industrial parks according to claim 2, characterized in that, The energy storage unit includes a high-temperature heat pump, a high-temperature thermal storage tank, and a low-temperature thermal storage tank. The high-temperature heat pump includes an evaporator and a compressor connected in series. The liquid outlet of the low-temperature thermal storage tank and the steam inlet of the high-temperature thermal storage tank are respectively connected to the liquid inlet and liquid outlet of the evaporator. The evaporator is used to heat the low-temperature water flowing from the low-temperature thermal storage tank to the high-temperature thermal storage tank into high-temperature steam using the input heat energy. The compressor is used to consume the input electrical energy to compress the low-temperature water flowing from the low-temperature thermal storage tank to the high-temperature thermal storage tank into high-temperature steam.

4. The co-generation energy storage and supply system for zero-carbon industrial parks according to claim 3, characterized in that, The high-temperature steam includes high-temperature high-pressure steam and high-temperature low-pressure steam; The high-temperature thermal storage tank includes a high-temperature and high-pressure thermal storage zone and a high-temperature and low-pressure thermal storage zone. The high-temperature and high-pressure thermal storage zone is used to store high-temperature and high-pressure steam, and the high-temperature and low-pressure thermal storage zone is used to store high-temperature and low-pressure steam.

5. The co-generation energy storage and supply system for zero-carbon industrial parks according to claim 3, characterized in that, The energy storage unit also includes a steam input pipeline connected to the steam inlet of the high-temperature thermal storage tank, for inputting high-temperature steam generated during industrial processes into the high-temperature thermal storage tank.

6. The co-generation energy storage and supply system for zero-carbon industrial parks according to claim 3, characterized in that, The electrothermal output unit includes a steam turbine connected to the steam outlet of the high-temperature thermal storage tank, which is used to generate electricity using the high-temperature steam output from the high-temperature thermal storage tank to supply electricity to the user terminal.

7. The co-generation energy storage and supply system for zero-carbon industrial parks according to claim 6, characterized in that, The electric heating output unit also includes a condenser and a working fluid pump, which are connected in series between the steam outlet of the steam turbine and the liquid inlet of the cryogenic heat storage tank.

8. The co-generation energy storage and supply system for zero-carbon industrial parks according to claim 3, characterized in that, The electric heating output unit includes a steam output pipeline connected to the steam outlet of the high-temperature heat storage tank, which is used to directly supply the high-temperature steam output from the high-temperature heat storage tank to the steam-using terminal.

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