A device for driving a pump of a full vanadium flow battery by using waste heat of tail flue gas of a boiler

Abstract

This invention discloses a device for driving a vanadium redox flow battery pump using waste heat from boiler tail flue gas. Belonging to the field of industrial waste heat utilization and vanadium redox flow battery technology, it solves the problem that existing technologies cannot efficiently recover low-grade waste heat from boiler tail flue gas, nor can they convert it into the driving force required for the vanadium redox flow battery pump. The device includes a boiler tail flue, a waste heat recovery module, a thermal-mechanical energy conversion module, a transmission module, a vanadium redox flow battery circulating pump module, and a control system. This invention can absorb low-grade waste heat from boiler tail flue gas through the waste heat recovery module and convert the thermal energy of the waste heat into the mechanical energy for the operation of the vanadium redox flow battery pump module through the thermal-mechanical energy conversion module, improving the overall energy utilization efficiency and meeting the development needs of energy conservation and emission reduction. Through this invention, the operating cost of the vanadium redox flow battery system is significantly reduced.

Description

Technical Field

[0001] This invention belongs to the field of industrial waste heat utilization and vanadium redox flow battery technology, specifically relating to a device that uses waste heat from boiler tail flue gas to drive a vanadium redox flow battery pump. Background Technology

[0002] With the transformation of the global energy structure and the advancement of sustainable development concepts, energy storage technology is playing an increasingly important role in modern energy systems. Vanadium redox flow batteries, as a safe, reliable, long-lasting, environmentally friendly energy storage technology that allows for real-time monitoring of charge and discharge status, are gradually becoming a hot topic in the energy storage field. They play a crucial role in improving grid stability, load balancing, providing emergency backup power, and enhancing grid operating efficiency.

[0003] The reaction mechanism of vanadium redox flow battery is as follows: Figure 1 As shown, the working principle of the vanadium redox flow battery is based on the redox reaction of vanadium ions in different valence states in the electrolyte on the electrode surface, thereby realizing the interconversion of chemical energy and electrical energy. During charging, tetravalent vanadium ions in the positive electrode electrolyte are oxidized to pentavalent vanadium ions, releasing one electron and generating two hydrogen ions.

[0004] V 4+ +H₂O→V 5+ +2H + +e - (1) In the negative electrode electrolyte, trivalent vanadium ions are reduced to divalent vanadium ions, while consuming one hydrogen ion. V 3+ +H + +e - →V 2+ During the discharge process, pentavalent vanadium ions in the positive electrode electrolyte gain one electron and are reduced to tetravalent vanadium ions, while consuming two hydrogen ions.

[0005] V 5+ +H2O+e - →V 4+ +2H + In the negative electrode electrolyte, divalent vanadium ions lose one electron and are oxidized to trivalent vanadium ions, while simultaneously producing one hydrogen ion.

[0006] V 2+ →V 3+ +H + +e - In vanadium redox flow batteries, the conversion between chemical energy and electrical energy is achieved through the redox reactions of vanadium ions in different valence states at the electrode surfaces in the electrolyte. During charging and discharging, hydrogen ions migrate from the positive electrode to the negative electrode inside the battery (during charging), and vice versa during discharging; the electrochemical reactions inside the battery manifest as the migration of hydrogen ions, which generates current in the external circuit. Battery performance is affected by factors such as the flow channels and flow rate of the electrolyte, and the circulation of the electrolyte depends on the drive of a circulation pump. However, most existing vanadium redox flow battery systems use grid-connected pumps, which not only increases the electricity costs for enterprises but also fails to meet energy conservation and emission reduction requirements.

[0007] In the industrial production process of thermal power plants, boilers, as core thermal energy equipment, typically carry a large amount of waste heat in their flue gas. The flue gas temperature at the tail end of power plant boilers is generally between 100-150℃. Directly discharging this waste heat not only causes serious energy waste but also increases the pressure on environmental thermal regulation, posing a significant threat to the environment. Currently, waste heat utilization technologies for boiler tail gas are mostly applied to heating condensate and preheating steam, but there are still shortcomings in the cascade utilization and efficient conversion of waste heat.

[0008] While there are existing examples of coupling industrial waste heat with energy storage systems, such as combining metallurgical waste heat with vanadium redox flow battery electrode preparation and using boiler waste heat to drive power generation equipment, there is still no technology that directly converts boiler tail gas waste heat into the driving force for vanadium redox flow battery pumps. Therefore, how to efficiently recover the low-grade waste heat from boiler tail gas and accurately convert it into the driving force required for vanadium redox flow battery pumps, thereby achieving high-value utilization of waste heat resources and reducing energy consumption of energy storage systems, has become an urgent technical problem to be solved. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing a device that uses waste heat from boiler tail flue gas to drive a vanadium redox flow battery pump. This solves the problem that existing technologies cannot efficiently recover the low-grade waste heat from boiler tail flue gas, nor can they convert it into the driving force required for the vanadium redox flow battery pump.

[0010] This invention is implemented as follows: a device for driving a vanadium redox flow battery pump using waste heat from boiler tail gas, the device comprising: The boiler tail flue is used to convey and guide the flue gas at the tail of the boiler. The waste heat recovery module is installed in the tail flue of the boiler to absorb the waste heat in the flue gas at the tail of the boiler. A thermal-mechanical energy conversion module, connected to the waste heat recovery module, is used to acquire the thermal energy absorbed by the waste heat recovery module and convert the thermal energy into mechanical energy; A transmission module, connected to the thermal-mechanical energy conversion module, is used to transfer the mechanical energy converted by the thermal-mechanical energy conversion module to the vanadium redox flow battery circulation pump module. The vanadium redox flow battery circulation pump module is used to drive the positive and negative electrolytes in the vanadium redox flow battery system to circulate between the corresponding vanadium redox flow battery stack and the storage tank. The control system is electrically connected to the waste heat recovery module, the thermal-mechanical energy conversion module, and the vanadium redox flow battery circulation pump module, respectively, and is used to control the operation of the waste heat recovery module, the thermal-mechanical energy conversion module, and the vanadium redox flow battery circulation pump module.

[0011] Preferably, the heat-to-mechanical energy conversion module includes: The evaporator has its input end connected to the output end of the waste heat recovery module. It is used to receive waste heat from the flue gas and generate high-temperature and high-pressure steam through the waste heat from the flue gas. An expander is connected to the output end of the evaporator. The expander has a built-in impeller and is used to receive high-temperature and high-pressure steam. The high-temperature and high-pressure steam drives the impeller to rotate, converting the thermal energy of the high-temperature and high-pressure steam into mechanical energy. The condenser is connected to the expander and is used to receive low-temperature, low-pressure condensed liquid water after heat exchange in the expander. A working fluid pump, installed at the output end of the condenser, is used to pump the low-temperature, low-pressure condensed liquid water in the condenser into the evaporator, thereby realizing the circulation of the heat energy to mechanical energy conversion module.

[0012] Preferably, the transmission module includes: A coupling, which is fixedly connected to the output shaft of the expander impeller; A gearbox fixedly connected to a coupling, the output end of which is connected to a vanadium redox flow battery circulating pump module.

[0013] Preferably, the all-vanadium redox flow battery circulation pump module includes: Positive circulation pump; The negative electrode circulation pump, the positive electrode circulation pump and the negative electrode circulation pump are used to drive the positive electrode electrolyte and the negative electrode electrolyte of the vanadium redox flow battery to circulate between the vanadium redox flow battery stack and the storage tank, thereby driving the operation of the vanadium redox flow battery; At least one set of flow sensors is installed on the outlet pipes of the positive and negative circulating pumps to detect the circulating flow rate of the electrolyte in real time and upload the flow signal to the control system.

[0014] Preferably, the control system includes a controller, a temperature sensor, and a speed sensor. The controller is electrically connected to the temperature sensor and the speed sensor, respectively. The temperature sensor is located between the boiler tail flue and the waste heat recovery module to detect the flue gas temperature in real time. The speed sensor is located on the output shaft of the expander impeller to detect the expander speed in real time and upload the speed signal to the controller.

[0015] Preferably, the controller is a PLC controller.

[0016] Preferably, the positive electrode circulation pump is connected to the positive electrode storage tank, and the negative electrode circulation pump is connected to the negative electrode storage tank.

[0017] Compared with the prior art, the embodiments of this application have the following main advantages: This invention can absorb low-grade waste heat from boiler tail flue gas through a waste heat recovery module, and convert the thermal energy of the waste heat into mechanical energy for the operation of the vanadium redox flow battery pump module through a heat-to-mechanical energy conversion module. This improves the overall energy utilization efficiency and meets the development needs of energy conservation and emission reduction. Furthermore, addressing the high energy consumption of traditional grid-powered vanadium redox flow battery circulating pumps, this invention significantly reduces the operating cost of the vanadium redox flow battery system. In addition, this invention has a compact structure with tightly connected components, and requires no modification to the existing boiler tail flue and vanadium redox flow battery; only the modules need to be added between them. It offers high compatibility, and through dynamic adjustment, various parameters can be dynamically adjusted to meet the required operating conditions in real time, resulting in high safety performance and a long service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the reaction mechanism of existing vanadium redox flow batteries.

[0019] Figure 2 This is a schematic diagram of the device provided by the present invention, which utilizes the waste heat of flue gas at the tail end of a boiler to drive a vanadium redox flow battery pump.

[0020] In the diagram: 1: Boiler tail flue; 2: Waste heat recovery module; 3: Thermal energy-mechanical energy conversion module; 3-1: Evaporator; 3-2: Expander; 3-3: Condenser; 3-4: Working fluid pump; 4: Transmission module; 4-1: Coupling; 4-2: Gearbox; 5: Vanadium redox flow battery circulation pump module; 5-1: Positive electrode circulation pump; 5-2: Negative electrode circulation pump; 5-3: Flow sensor; 6: Control system; 6-1: Controller; 6-2: Temperature sensor; 6-3: Speed ​​sensor; 7: Vanadium redox flow battery stack; 8: Positive electrode storage tank; 9: Negative electrode storage tank. Detailed Implementation

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0022] Existing technologies cannot efficiently recover the low-grade waste heat from boiler tail flue gas, nor can they convert it into the driving force required for a vanadium redox flow battery pump. To address these issues, we propose a device that utilizes the waste heat from boiler tail flue gas to drive a vanadium redox flow battery pump. In short, the device consists of a boiler tail flue 1, a waste heat recovery module 2, a thermal-mechanical energy conversion module 3, a transmission module 4, a vanadium redox flow battery circulating pump module 5, and a control system 6. This invention can absorb the low-grade waste heat from the boiler tail flue gas through the waste heat recovery module 2, and convert the thermal energy of the waste heat into the mechanical energy required for the vanadium redox flow battery pump module to operate through the thermal-mechanical energy conversion module 3. This improves the overall energy utilization efficiency, meeting the development needs of energy conservation and emission reduction. Furthermore, considering the high energy consumption of traditional grid-powered vanadium redox flow battery circulating pump operation, this invention significantly reduces the operating cost of the vanadium redox flow battery system. In addition, the present invention has a compact structure and all components are closely connected. It does not require modification of the original boiler tail flue 1 and vanadium redox flow sulfur battery. It only requires the addition of various modules between the two. It has high compatibility and through dynamic adjustment, it can make various parameters meet the required operating conditions in real time. It has the advantages of high safety performance and long service life.

[0023] This invention provides a device for driving a vanadium redox flow battery pump using waste heat from boiler tail flue gas, such as... Figure 1 As shown, the device for driving a vanadium redox flow battery pump using waste heat from boiler tail gas includes: Boiler tail flue 1 is used to convey and guide the flue gas at the tail of the boiler. Waste heat recovery module 2 is installed in the tail flue 1 of the boiler to absorb waste heat in the tail flue gas of the boiler, thereby ensuring efficient absorption of waste heat from the flue gas. The thermal energy to mechanical energy conversion module 3 is connected to the waste heat recovery module 2 and is used to obtain the thermal energy absorbed by the waste heat recovery module 2 and convert the thermal energy into mechanical energy; The transmission module 4 is connected to the thermal-mechanical energy conversion module 3 and is used to transfer the mechanical energy converted by the thermal-mechanical energy conversion module 3 to the vanadium redox flow battery circulation pump module 5. The vanadium redox flow battery circulation pump module 5 is used to drive the positive and negative electrolytes in the vanadium redox flow battery system to circulate between the corresponding vanadium redox flow battery stack 7 and the storage tank. The control system 6 is electrically connected to the waste heat recovery module 2, the thermal energy-mechanical energy conversion module 3, and the vanadium redox flow battery circulation pump module 5, respectively, and is used to control the operation of the waste heat recovery module 2, the thermal energy-mechanical energy conversion module 3, and the vanadium redox flow battery circulation pump module 5.

[0024] This invention can absorb low-grade waste heat from boiler tail flue gas through waste heat recovery module 2, and convert the thermal energy of the waste heat into mechanical energy for the operation of the vanadium redox flow battery pump module through heat-to-mechanical energy conversion module 3. This improves the overall energy utilization efficiency and meets the development needs of energy conservation and emission reduction. Furthermore, addressing the high energy consumption of traditional grid-powered vanadium redox flow battery circulating pumps, this invention significantly reduces the operating cost of the vanadium redox flow battery system. In addition, this invention has a compact structure with tightly connected components, and requires no modification to the existing boiler tail flue 1 and vanadium redox flow battery; only the modules need to be added between them. It offers high compatibility, and through dynamic adjustment, various parameters can be dynamically adjusted to meet the required operating conditions in real time, resulting in high safety performance and a long service life.

[0025] In a further preferred embodiment of the present invention, such as Figure 1 As shown, the thermal-mechanical energy conversion module 3 includes: Evaporator 3-1, the input end of evaporator 3-1 is connected to the output end of waste heat recovery module 2, and is used to receive waste heat from flue gas and generate high-temperature and high-pressure steam through the waste heat from flue gas. Expander 3-2 is connected to the output end of evaporator 3-1. Expander 3-2 has a built-in impeller. Expander 3-2 is used to receive high-temperature and high-pressure steam and drive the impeller to rotate through the high-temperature and high-pressure steam, converting the thermal energy of the high-temperature and high-pressure steam into mechanical energy. Condenser 3-3 is connected to expander 3-2 and is used to receive low-temperature, low-pressure condensed liquid water after heat exchange in expander 3-2; The working fluid pump 3-4 is installed at the output end of the condenser 3-3 to pump the low-temperature and low-pressure condensed liquid water in the condenser 3-3 into the evaporator 3-1, so as to realize the circulation of the heat energy to mechanical energy conversion module 3.

[0026] In this embodiment, water exchanges heat with the waste heat of the flue gas in the evaporator 3-1, absorbing heat from the waste heat recovery module 2 to form high-temperature, high-pressure steam. This high-temperature, high-pressure steam is then transported to the expander 3-2 via a pipeline, driving the impeller inside the expander 3-2 to rotate at high speed, thus converting thermal energy into mechanical energy. The low-temperature, low-pressure steam discharged from the expander 3-2 enters the condenser 3-3, which adopts a water-cooled structure. Circulating cooling water condenses the low-pressure steam into liquid water, which is then pumped back to the evaporator 3-1, achieving water-vapor circulation.

[0027] In a further preferred embodiment of the present invention, such as Figure 1 As shown, the transmission module 4 includes: Coupling 4-1, wherein coupling 4-1 is fixedly connected to the output shaft of the impeller of expander 3-2; A reduction gearbox 4-2 is fixedly connected to the coupling 4-1, and the output end of the reduction gearbox 4-2 is connected to the vanadium redox flow battery circulating pump module 5.

[0028] In this embodiment, the output end of the expander 3-2 is connected to the input end of the gearbox 4-2 via a coupling 4-1. The coupling 4-1 can effectively reduce the damage to the components caused by the speed fluctuation of the expander 3-2 during operation. The gearbox 4-2 is a hardened cylindrical gear reducer. By adjusting the transmission ratio, the output speed of the expander 3-2 can be precisely adjusted to the rated speed required by the vanadium redox flow battery circulation pump. The output end of the gearbox 4-2 is connected to the positive electrode circulation pump 5-1 and the negative electrode circulation pump 5-2 of the vanadium redox flow battery circulation pump module 5, thereby driving the dual pumps of the vanadium redox flow battery system to rotate.

[0029] In a further preferred embodiment of the present invention, such as Figure 1 As shown, the vanadium redox flow battery circulating pump module 5 includes: Positive circulation pump 5-1; The negative electrode circulation pump 5-2, the positive electrode circulation pump 5-1, and the negative electrode circulation pump 5-2 are used to drive the positive electrode electrolyte and the negative electrode electrolyte of the vanadium redox flow battery to circulate between the vanadium redox flow battery stack 7 and the storage tank, respectively, thereby driving the operation of the vanadium redox flow battery. The positive electrode circulation pump 5-1 is connected to the positive electrode storage tank 8, and the negative electrode circulation pump 5-2 is connected to the negative electrode storage tank 9. Both the positive electrode circulation pump 5-1 and the negative electrode circulation pump 5-2 are centrifugal pumps. At least one set of flow sensors 5-3 are installed on the outlet pipes of the positive electrode circulation pump 5-1 and the negative electrode circulation pump 5-2. These flow sensors are used to detect the real-time circulation flow rate of the electrolyte and upload the flow signal to the control system 6. The flow sensors 5-3 can be electromagnetic flow sensors. The flow sensors 5-3, installed on the outlet pipes of the positive electrode circulation pump 5-1 and the negative electrode circulation pump 5-2 respectively, can detect the real-time circulation flow rate of the electrolyte in the positive electrode circulation pump 5-1 and the negative electrode circulation pump 5-2, and convert the flow signal into an electrical signal which is then transmitted to the control system 6. The inlet of the positive electrode circulation pump 5-1 is connected to the positive electrode storage tank 8, and its outlet is connected to the positive electrode inlet of the vanadium redox flow battery stack 7. The inlet of the negative electrode circulation pump 5-2 is connected to the negative electrode storage tank 9, and its outlet is connected to the negative electrode inlet of the vanadium redox flow battery stack 7. Driven by the positive electrode circulation pump 5-1 and the negative electrode circulation pump 5-2, the electrolyte flows in the circuit and reacts in the stack, thereby driving the operation of the vanadium redox flow battery.

[0030] In this embodiment, the control system 6 includes a controller 6-1, a temperature sensor 6-2, and a speed sensor 6-3. The controller 6-1 is electrically connected to both the temperature sensor 6-2 and the speed sensor 6-3. The temperature sensor 6-2 is located between the boiler tail flue 1 and the waste heat recovery module 2 to detect the flue gas temperature in real time. The speed sensor 6-3 is located on the output shaft of the expander 3-2 impeller to detect the expander 3-2 speed in real time and upload the speed signal to the controller 6-1. The controller 6-1 is a PLC controller. The control system 6 is centered around the PLC controller. The temperature sensor 6-2 is installed at the midpoint between the boiler tail flue 1 and the waste heat recovery module 2 to detect the flue gas temperature in real time; the speed sensor 6-3 is installed on the output shaft of the expander 3-2 to detect the expander 3-2 speed in real time. The PLC controller receives signals from the temperature sensor 6-2, the flow sensor 6-3, and the speed sensor 6-3 in real time and dynamically adjusts the operating parameters of each module through a preset program. When temperature sensor 6-2 detects excessively high flue gas temperature, the excessive waste heat will cause the expander 3-2 to rotate too fast. Controller 6-1 will adjust the output flow rate of working fluid pump 3-4 to increase the circulation of organic working fluid, thereby balancing the output power of expander 3-2 and ensuring the circulation pump speed remains stable within normal requirements. When temperature sensor 6-2 detects excessively low flue gas temperature, the waste heat will cause the expander 3-2 to rotate slower. Controller 6-1 will adjust the transmission ratio of reduction gearbox 4-2 to meet the basic speed requirements of the circulation pump. When flow sensor 5-3 detects that the electrolyte flow rate is insufficient for the normal reaction of the fuel cell stack, controller 6-1 will increase the water circulation rate to maximize the utilization of existing waste heat, ensuring that the circulation pump flow rate meets the normal reaction requirements of the vanadium redox flow battery stack 7.

[0031] In summary, this invention provides a device for driving a vanadium redox flow battery pump using waste heat from boiler tail flue gas. The embodiment of this invention can absorb low-grade waste heat from the boiler tail flue gas through a waste heat recovery module 2, and convert the thermal energy of the waste heat into mechanical energy for the operation of the vanadium redox flow battery pump module through a heat-to-mechanical energy conversion module 3. This improves the overall energy utilization efficiency and meets the development needs of energy conservation and emission reduction. Furthermore, addressing the high energy consumption of traditional grid-powered vanadium redox flow battery circulating pumps, this invention significantly reduces the operating cost of the vanadium redox flow battery system. In addition, this invention has a compact structure with tightly connected components, and requires no modification to the existing boiler tail flue 1 and vanadium redox flow battery; only the modules need to be added between them. It has high compatibility, and through dynamic adjustment, various parameters can be dynamically adjusted to meet the required operating conditions in real time, offering advantages such as high safety performance and long service life.

[0032] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0033] It should be understood that the disclosed apparatus can be implemented in other ways, given the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative; the division of units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; the indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions are also within the scope of protection of the present invention.

Claims

1. A device for driving a vanadium redox flow battery pump using waste heat from boiler tail flue gas, characterized in that, The device includes: The boiler tail flue is used to convey and guide the flue gas at the tail of the boiler. The waste heat recovery module is installed in the tail flue of the boiler to absorb the waste heat in the flue gas at the tail of the boiler. A thermal-mechanical energy conversion module, connected to the waste heat recovery module, is used to acquire the thermal energy absorbed by the waste heat recovery module and convert the thermal energy into mechanical energy; A transmission module, connected to the thermal-mechanical energy conversion module, is used to transfer the mechanical energy converted by the thermal-mechanical energy conversion module to the vanadium redox flow battery circulation pump module. The vanadium redox flow battery circulation pump module is used to drive the positive and negative electrolytes in the vanadium redox flow battery system to circulate between the corresponding vanadium redox flow battery stack and the storage tank. The control system is electrically connected to the waste heat recovery module, the thermal-mechanical energy conversion module, and the vanadium redox flow battery circulation pump module, respectively, and is used to control the operation of the waste heat recovery module, the thermal-mechanical energy conversion module, and the vanadium redox flow battery circulation pump module.

2. The device for driving a vanadium redox flow battery pump using waste heat from boiler tail gas as described in claim 1, characterized in that: The heat-to-mechanical energy conversion module includes: The evaporator has its input end connected to the output end of the waste heat recovery module. It is used to receive waste heat from the flue gas and generate high-temperature and high-pressure steam through the waste heat from the flue gas. An expander is connected to the output end of the evaporator. The expander has a built-in impeller and is used to receive high-temperature and high-pressure steam. The high-temperature and high-pressure steam drives the impeller to rotate, converting the thermal energy of the high-temperature and high-pressure steam into mechanical energy. The condenser is connected to the expander and is used to receive low-temperature, low-pressure condensed liquid water after heat exchange in the expander. A working fluid pump, installed at the output end of the condenser, is used to pump the low-temperature, low-pressure condensed liquid water in the condenser into the evaporator, thereby realizing the circulation of the heat energy to mechanical energy conversion module.

3. The device for driving a vanadium redox flow battery pump using waste heat from boiler tail gas as described in claim 2, characterized in that: The transmission module includes: A coupling, which is fixedly connected to the output shaft of the expander impeller; A gearbox fixedly connected to a coupling, the output end of which is connected to a vanadium redox flow battery circulating pump module.

4. The device for driving a vanadium redox flow battery pump using waste heat from boiler tail gas as described in claim 1, characterized in that: The vanadium redox flow battery circulation pump module includes: Positive circulation pump; The negative electrode circulation pump, the positive electrode circulation pump and the negative electrode circulation pump are used to drive the positive electrode electrolyte and the negative electrode electrolyte of the vanadium redox flow battery to circulate between the vanadium redox flow battery stack and the storage tank, thereby driving the operation of the vanadium redox flow battery; At least one set of flow sensors is installed on the outlet pipes of the positive and negative circulating pumps to detect the circulating flow rate of the electrolyte in real time and upload the flow signal to the control system.

5. The device for driving a vanadium redox flow battery pump using waste heat from boiler tail gas as described in claim 4, characterized in that: The control system includes a controller, a temperature sensor, and a speed sensor. The controller is electrically connected to the temperature sensor and the speed sensor, respectively. The temperature sensor is located between the boiler tail flue and the waste heat recovery module to detect the flue gas temperature in real time. The speed sensor is located on the output shaft of the expander impeller to detect the expander speed in real time and upload the speed signal to the controller.

6. The device for driving a vanadium redox flow battery pump using waste heat from boiler tail gas as described in claim 5, characterized in that: The controller is a PLC controller.

7. The apparatus for driving a vanadium redox flow battery pump using waste heat from boiler tail gas as described in any one of claims 4-6, characterized in that: The positive electrode circulation pump is connected to the positive electrode storage tank, and the negative electrode circulation pump is connected to the negative electrode storage tank.

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