All-vanadium redox flow battery and cogeneration coupling optimization and waste heat utilization system

Abstract

The utility model relates to the technical field of all-vanadium redox flow batteries, in particular to an all-vanadium redox flow battery and cogeneration coupling optimization and waste heat utilization system. Comprising an all-vanadium redox flow battery system, a combined heat and power generation system and a waste heat recovery and conversion system, the all-vanadium redox flow battery system comprises a positive electrode, a negative electrode, a positive electrode electrolyte storage tank, a negative electrode electrolyte storage tank and a power source, the positive electrode and the negative electrode are connected with the power source, and the positive electrode electrolyte storage tank and the negative electrode electrolyte storage tank are connected with the positive electrode and the negative electrode respectively; the combined heat and power generation system comprises a boiler, a steam turbine and a generator, the boiler is connected with the steam turbine, the steam turbine is connected with the generator, the steam turbine is connected with the positive electrode electrolyte storage tank and the negative electrode electrolyte storage tank through the waste heat recovery and conversion system, and the generator is connected with a power source through the electric energy system. The energy utilization efficiency is improved, and deep coupling and optimized operation of the energy storage system and the combined heat and power generation system are promoted. The utility model is mainly applied to the coupling optimization of all-vanadium redox flow batteries and combined heat and power generation.

Description

Technical Field

[0001] The utility model relates to the technical field of all-vanadium redox flow batteries, and more specifically, to an all-vanadium redox flow battery and a combined heat and power generation coupling optimization and waste heat utilization system. Background Art

[0002] With the advancement of the global energy transformation and low-carbon development goals, new energy technologies, especially renewable energy power generation and energy storage technologies, have received extensive attention. All-vanadium redox flow batteries have shown great application potential in the field of large-scale energy storage due to their advantages such as long life, large capacity, safety and reliability, etc. However, in the actual operation process of existing all-vanadium redox flow batteries, limited by their sensitivity to working temperature, too low or too high electrolyte temperature will affect the charge and discharge efficiency and service life of the battery. Therefore, additional energy needs to be invested for temperature control.

[0003] On the other hand, the combined heat and power generation system realizes the simultaneous and efficient production of electric energy and heat energy through the cascade utilization of primary energy, but usually generates a large amount of waste heat. This part of waste heat resources has not been fully and effectively utilized, becoming a major bottleneck affecting the overall energy utilization efficiency.

[0004] Currently, the urgent problem to be solved is how to deeply integrate the energy storage system of all-vanadium redox flow batteries with the combined heat and power generation system, convert the waste heat resources originally regarded as waste into valuable energy, provide a suitable working temperature for the all-vanadium redox flow battery, optimize the charge and discharge performance and service life of the battery, and ultimately achieve the efficient coordinated utilization of electric energy and heat energy, and improve the economic and social benefits of the overall energy system. Summary of the Utility Model

[0005] To overcome the deficiencies in the above-mentioned prior art, the utility model provides an all-vanadium redox flow battery and a combined heat and power generation coupling optimization and waste heat utilization system. This system can utilize the waste heat resources generated during the combined heat and power generation process to achieve precise control of the working temperature of the all-vanadium redox flow battery, optimize the charge and discharge efficiency and service life of the battery, greatly improve the overall energy utilization efficiency, and promote the deep coupling and optimized operation of the energy storage system and the combined heat and power generation system.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0007] A system for optimizing the coupling of a vanadium redox flow battery with cogeneration and utilizing waste heat, comprising a vanadium redox flow battery system, a cogeneration system, and a waste heat recovery and conversion system. The vanadium redox flow battery system includes a positive electrode, a negative electrode, a positive electrolyte storage tank, a negative electrolyte storage tank, and a power source. The positive electrode and the negative electrode are both connected to the power source. The positive electrolyte storage tank and the negative electrolyte storage tank are respectively connected to the positive electrode and the negative electrode. The cogeneration system includes a boiler, a steam turbine, and a generator. The boiler is connected to the steam turbine, and the steam turbine is connected to the generator. The steam turbine is connected to the positive electrolyte storage tank and the negative electrolyte storage tank respectively through the waste heat recovery and conversion system. The generator is connected to the power source through an electrical energy system.

[0008] A diaphragm is provided between the positive electrode and the negative electrode.

[0009] The positive electrolyte storage tank is connected to a positive storage tank temperature control unit, and the negative electrolyte storage tank is connected to a negative storage tank temperature control unit.

[0010] Heat exchange devices are provided outside both the positive electrolyte storage tank and the negative electrolyte storage tank. The steam turbine is connected to the heat exchange devices outside the positive electrolyte storage tank and the negative electrolyte storage tank through the waste heat recovery and conversion system.

[0011] The waste heat recovery and conversion system includes a positive storage tank heat exchange inlet pipe, a positive storage tank heat exchange outlet pipe, a negative storage tank heat exchange inlet pipe, and a negative storage tank heat exchange outlet pipe. The steam turbine is connected to the heat exchange device outside the positive electrolyte storage tank through the positive storage tank heat exchange inlet pipe. The heat exchange device outside the positive electrolyte storage tank is connected to the boiler through the positive storage tank heat exchange outlet pipe. The steam turbine is connected to the heat exchange device outside the negative electrolyte storage tank through the negative storage tank heat exchange inlet pipe. The heat exchange device outside the negative electrolyte storage tank is connected to the boiler through the negative storage tank heat exchange outlet pipe.

[0012] Solenoid valves are provided in both the positive storage tank heat exchange inlet pipe and the negative storage tank heat exchange inlet pipe.

[0013] The positive storage tank temperature control unit and the negative storage tank temperature control unit are respectively electrically connected to the solenoid valves in the positive storage tank heat exchange inlet pipe and the negative storage tank heat exchange inlet pipe.

[0014] The electrical energy system includes a rectifier and an inverter. The generator is connected to the power source through the rectifier and the inverter.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] Improved energy utilization efficiency: By efficiently recovering and utilizing the waste heat resources generated by combined heat and power (CHP), not only is energy waste reduced, but the overall energy utilization efficiency is also enhanced. This enables the conversion of previously wasted waste heat into valuable energy, which is used to optimize the operating conditions of the all-vanadium redox flow battery. Battery performance optimization: Through the precise heating of the electrolyte of the all-vanadium redox flow battery by the waste heat recovery system, the operating temperature of the battery is significantly improved, thereby effectively increasing the charge-discharge efficiency and service life of the battery and enhancing the performance stability of the energy storage system. Deep coupling and optimized operation: Deep coupling between the energy storage system and the CHP system is achieved, enabling the coordinated utilization of electrical energy and waste heat resources. During off-peak grid hours, electrical energy can be used to charge the battery, and during peak hours or when the output of renewable energy is unstable, the battery can discharge to provide power support, fully leveraging the peak shaving and valley filling function of energy storage and greatly enhancing the flexibility and stability of the power system. Energy conservation, emission reduction, and economic benefits: The demand for additional energy is reduced, greenhouse gas emissions are lowered, which is conducive to achieving a low-carbon and sustainable energy utilization model. At the same time, through optimized scheduling and resource complementarity, the economic benefits of the system are improved, bringing greater social benefits to energy production and consumption. Technical integration and adaptability: This system has strong adaptability and scalability, and is suitable for CHP and energy storage application scenarios of different scales and types. The system can utilize the waste heat resources generated during the CHP process to precisely control the operating temperature of the all-vanadium redox flow battery, while optimizing the charge-discharge efficiency and service life of the battery, significantly enhancing the overall energy utilization efficiency, and promoting the deep coupling and optimized operation of the energy storage system and the CHP system. Description of the Drawings

[0017] Figure 1 Schematic diagram of the present utility model;

[0018] In the figure: 1 is the positive electrode, 2 is the negative electrode, 3 is the separator, 4 is the positive electrolyte storage tank, 5 is the negative electrolyte storage tank, 6 is the temperature control unit of the positive storage tank, 7 is the temperature control unit of the negative storage tank, 8 is the power supply, 9 is the boiler, 10 is the steam turbine, 11 is the generator, 12 is the heat exchange inlet pipe of the positive storage tank, 13 is the heat exchange outlet pipe of the positive storage tank, 14 is the heat exchange inlet pipe of the negative storage tank, 15 is the heat exchange outlet pipe of the negative storage tank, 16 is the rectifier, and 17 is the inverter. Detailed Description of the Preferred Embodiment

[0019] In order to more clearly understand the above objects, features, and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0020] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present utility model is not limited by the specific embodiments disclosed below.

[0021] As Figure 1 shown, an optimized system for coupling a vanadium redox flow battery with cogeneration and waste heat utilization includes a vanadium redox flow battery system, a cogeneration system, and a waste heat recovery and conversion system. The vanadium redox flow battery system includes a positive electrode 1, a negative electrode 2, a positive electrolyte storage tank 4, a negative electrolyte storage tank 5, and a power source 8. The positive electrode 1 and the negative electrode 2 are both connected to the power source 8. The positive electrolyte storage tank 4 and the negative electrolyte storage tank 5 are respectively connected to the positive electrode 1 and the negative electrode 2. The cogeneration system includes a boiler 9, a steam turbine 10, and a generator 11. The boiler 9 is connected to the steam turbine 10, and the steam turbine 10 is connected to the generator 11. The steam turbine 10 is connected to the positive electrolyte storage tank 4 and the negative electrolyte storage tank 5 respectively through the waste heat recovery and conversion system. The generator 11 is connected to the power source 8 through an electric energy system.

[0022] Preferably, a separator 3 is provided between the positive electrode and the negative electrode.

[0023] Preferably, the positive electrolyte storage tank 4 is connected with a positive storage tank temperature control unit 6, and the negative electrolyte storage tank 5 is connected with a negative storage tank temperature control unit 7.

[0024] Preferably, heat exchange devices are provided outside both the positive electrolyte storage tank 4 and the negative electrolyte storage tank 5. The steam turbine 10 is connected to the heat exchange devices outside the positive electrolyte storage tank 4 and the negative electrolyte storage tank 5 through the waste heat recovery and conversion system. Heat pipes or finned tube heat exchangers with high thermal conductivity and high temperature resistance, efficient plate heat exchangers or spiral wound heat exchangers are used to maximize the waste heat collection efficiency and efficiently convert the waste heat into heat energy suitable for heating the electrolyte in the vanadium redox flow battery system. In addition, phase change materials can also be selected as the heat energy storage medium to absorb and release waste heat through the phase change process, realizing the continuous and stable utilization of waste heat to cope with the imbalance between waste heat generation and battery power consumption requirements.

[0025] Preferably, the waste heat recovery and conversion system includes a positive storage tank heat exchange inlet pipe 12, a positive storage tank heat exchange outlet pipe 13, a negative storage tank heat exchange inlet pipe 14, and a negative storage tank heat exchange outlet pipe 15. The steam turbine 10 is connected to the heat exchange device outside the positive electrolyte storage tank 4 through the positive storage tank heat exchange inlet pipe 12. The heat exchange device outside the positive electrolyte storage tank 4 is connected to the boiler 9 through the positive storage tank heat exchange outlet pipe 13. The steam turbine is connected to the heat exchange device outside the negative electrolyte storage tank 5 through the negative storage tank heat exchange inlet pipe 14. The heat exchange device outside the negative electrolyte storage tank 5 is connected to the boiler 9 through the negative storage tank heat exchange outlet pipe 15.

[0026] Preferably, solenoid valves are provided in both the positive electrode storage tank heat exchange water inlet pipe 12 and the negative electrode storage tank heat exchange water inlet pipe 14.

[0027] Preferably, the positive electrode storage tank temperature control unit 6 and the negative electrode storage tank temperature control unit 7 are electrically connected to the solenoid valves in the positive electrode storage tank heat exchange water inlet pipe 12 and the negative electrode storage tank heat exchange water inlet pipe 14 respectively. Dynamically adjust the output heat of the waste heat recovery system and the speed of waste heat transfer to the battery.

[0028] Preferably, the electric energy system includes a rectifier 16 and an inverter 17. The generator 11 is connected to the power supply 8 through the rectifier 16 and the inverter 17. The electric energy generated by the combined heat and power generation system is processed by power conversion devices such as the rectifier 16 and the inverter 17, and is regulated for voltage and current according to the charging characteristics of the all-vanadium redox flow battery to ensure safe and effective charging of the battery. Combining the prediction of grid load demand and real-time monitoring, intelligently dispatch the distribution of electric energy, realize the charging of the battery during the grid valley period, and discharge during the peak period or when the output of renewable energy is unstable, and play the role of energy storage for peak shaving and valley filling.

[0029] The combined heat and power generation system starts and generates electricity, and at the same time generates waste heat. The waste heat recovery and conversion system captures the waste heat and efficiently converts it into heat energy suitable for heating the electrolyte. The converted heat energy is transported to the all-vanadium redox flow battery system through pipelines for regulating the temperature of the electrolyte. The positive electrode storage tank temperature control unit 6 and the negative electrode storage tank temperature control unit 7 monitor the electrolyte temperature in real time, and control the solenoid valves in the positive electrode storage tank heat exchange water inlet pipe 12 and the negative electrode storage tank heat exchange water inlet pipe 14 through feedback, so as to adjust the waste heat input. The electric energy generated by the combined heat and power generation system is processed by the rectifier 16 and the inverter 17 and then charges the all-vanadium redox flow battery system as needed. The battery management system monitors the battery state and schedules the charge and discharge activities according to the grid load demand. Charge and store energy during the grid valley period, and discharge and supply power during the peak period or when the output of renewable energy is unstable.

[0030] Only the preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A system for coupling optimization of a vanadium redox flow battery and cogeneration and waste heat utilization, characterized in that: It includes a vanadium redox flow battery system, a combined heat and power system, and a waste heat recovery and conversion system. The vanadium redox flow battery system includes a positive electrode (1), a negative electrode (2), a positive electrolyte storage tank (4), a negative electrolyte storage tank (5), and a power source (8). The positive electrode (1) and the negative electrode (2) are both connected to the power source (8). The positive electrolyte storage tank (4) and the negative electrolyte storage tank (5) are respectively connected to the positive electrode (1) and the negative electrode (2). The combined heat and power system includes a boiler (9), a steam turbine (10), and a generator (11). The boiler (9) is connected to the steam turbine (10), and the steam turbine (10) is connected to the generator (11). The steam turbine (10) is connected to the positive electrolyte storage tank (4) and the negative electrolyte storage tank (5) respectively through the waste heat recovery and conversion system. The generator (11) is connected to the power source (8) through an electric energy system.

2. The optimized coupling of a vanadium redox flow battery and cogeneration and waste heat utilization system according to claim 1, characterized in that: A diaphragm (3) is provided between the positive electrode (1) and the negative electrode (2).

3. The integrated optimization and waste heat utilization system for a vanadium redox flow battery and cogeneration according to claim 1, characterized in that: The positive electrolyte storage tank (4) is connected with a positive storage tank temperature control unit (6), and the negative electrolyte storage tank (5) is connected with a negative storage tank temperature control unit (7).

4. A vanadium redox flow battery and combined heat and power coupling optimization and waste heat utilization system according to claim 3, characterized in that: Heat exchange devices are provided outside both the positive electrolyte storage tank (4) and the negative electrolyte storage tank (5). The steam turbine (10) is connected to the heat exchange devices outside the positive electrolyte storage tank (4) and the negative electrolyte storage tank (5) through the waste heat recovery and conversion system.

5. A vanadium redox flow battery and combined heat and power coupling optimization and waste heat utilization system according to claim 4, characterized in that: The waste heat recovery and conversion system includes a positive storage tank heat exchange inlet pipe (12), a positive storage tank heat exchange outlet pipe (13), a negative storage tank heat exchange inlet pipe (14), and a negative storage tank heat exchange outlet pipe (15). The steam turbine (10) is connected to the heat exchange device outside the positive electrolyte storage tank (4) through the positive storage tank heat exchange inlet pipe (12). The heat exchange device outside the positive electrolyte storage tank (4) is connected to the boiler (9) through the positive storage tank heat exchange outlet pipe (13). The steam turbine is connected to the heat exchange device outside the negative electrolyte storage tank (5) through the negative storage tank heat exchange inlet pipe (14). The heat exchange device outside the negative electrolyte storage tank (5) is connected to the boiler (9) through the negative storage tank heat exchange outlet pipe (15).

6. The optimized coupling and waste heat utilization system of a vanadium redox flow battery and cogeneration according to claim 5, characterized in that: Solenoid valves are provided in both the positive storage tank heat exchange inlet pipe (12) and the negative storage tank heat exchange inlet pipe (14).

7. A vanadium redox flow battery and combined heat and power coupling optimization and waste heat utilization system according to claim 6, characterized in that: The positive storage tank temperature control unit (6) and the negative storage tank temperature control unit (7) are respectively electrically connected to the solenoid valves in the positive storage tank heat exchange inlet pipe (12) and the negative storage tank heat exchange inlet pipe (14).

8. A system for optimizing the coupling of a all-vanadium redox flow battery and cogeneration and utilizing waste heat according to claim 1, characterized in that: The electric energy system includes a rectifier (16) and an inverter (17). The generator (11) is connected to the power source (8) through the rectifier (16) and the inverter (17).

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