All-vanadium redox flow battery cooling system utilizing circulating cooling water of thermal power generating unit

Abstract

The invention relates to the technical field of all-vanadium redox flow batteries, in particular to an all-vanadium redox flow battery cooling system utilizing circulating cooling water of a thermal power generating unit. Comprising a thermal power generating unit and an all-vanadium redox flow battery pack, the all-vanadium redox flow battery pack comprises a positive electrode electrolyte storage tank, a first heat exchanger, an electric pile, a second heat exchanger and a negative electrode electrolyte storage tank, and the positive electrode electrolyte storage tank is connected with a positive electrode electrolyte working area through a first electrolyte circulating pump; the first heat exchanger is arranged between the first electrolyte circulating pump and the positive electrode electrolyte storage tank and is connected with the thermal power generating unit; the negative electrode electrolyte working area is connected with the negative electrode electrolyte storage tank through the second electrolyte circulating pump, the second heat exchanger is arranged between the second electrolyte circulating pump and the negative electrode electrolyte storage tank, and the second heat exchanger is connected with the thermal power generating unit. According to the system, the operation efficiency is improved, and the construction and operation cost of the all-vanadium redox flow battery energy storage system is reduced. The cooling device is mainly applied to the cooling aspect of the all-vanadium redox flow battery.

Description

Technical Field

[0001] The present invention relates to the technical field of all-vanadium liquid flow batteries, and more specifically to an all-vanadium liquid flow battery cooling system utilizing circulating cooling water of a thermal power unit. Background Art

[0002] With the large-scale access to renewable energy generation (such as wind and solar energy), electricity supply has become more random and volatile. In response to the instability of renewable energy generation, thermal power units have to frequently adjust their loads, especially during the peak of renewable energy output during the day, when thermal power units may need to reduce their loads to absorb excess renewable energy power; and at night when renewable energy output decreases, they need to quickly increase their loads to meet the remaining power demand. The scheduling flexibility of thermal power units is limited, and they operate in inefficient or non-optimal conditions for a long time, which not only affects the service life of the units, but also may reduce the operating efficiency of the overall power system.

[0003] The introduction of energy storage systems can buffer such fluctuations, store electricity when there is excess renewable energy generation, and release the stored electricity when there is insufficient generation, playing the role of shaving peaks and filling valleys and smoothing out grid fluctuations. The combined operation of energy storage and thermal power units greatly enhances the flexibility and stability of the power system, allowing thermal power units to adjust their operating status more smoothly and efficiently according to actual grid demand, reducing unnecessary start-stop times and load fluctuations, and thus improving the power system's ability to accept renewable energy.

[0004] All-vanadium liquid flow battery energy storage technology has become one of the most widely used battery technologies in the field of large-scale energy storage due to its advantages such as high safety, long cycle life and high efficiency. However, all-vanadium liquid flow batteries generate a lot of heat during electrochemical reactions, which causes the electrolyte temperature to rise. Excessively high electrolyte temperature will increase the electrolyte resistance, which in turn affects the electrochemical reaction rate and ion migration speed, and reduces the battery's charge and discharge efficiency and stability. Therefore, during the operation of all-vanadium liquid flow batteries, the electrolyte temperature must be effectively controlled. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a vanadium redox flow battery cooling system using circulating cooling water from thermal power units. The cooling system uses a large amount of circulating cooling water generated during the operation of the thermal power units to accurately and efficiently cool the electrolyte of the vanadium redox flow battery, thereby improving the stability and life of the vanadium redox flow battery.

[0006] Compared with the prior art, the present invention has the following beneficial effects: A vanadium liquid flow battery cooling system using circulating cooling water from a thermal power unit, comprising a thermal power unit and a vanadium liquid flow battery unit; the vanadium liquid flow battery unit comprises a positive electrode electrolyte storage tank, a first heat exchanger, a battery stack, a second heat exchanger and a negative electrode electrolyte storage tank, the battery stack is provided with a positive electrode electrolyte working area and a negative electrode electrolyte working area, the positive electrode electrolyte storage tank is connected to the positive electrode electrolyte working area through a first electrolyte circulation pump, the positive electrode electrolyte working area is connected to the positive electrode electrolyte through a pipeline The first heat exchanger is arranged between the first electrolyte circulation pump and the positive electrolyte storage tank, and the first heat exchanger is connected to the thermal power unit; the negative electrolyte working area is connected to the negative electrolyte storage tank through the second electrolyte circulation pump, the negative electrolyte working area is connected to the inlet of the negative electrolyte storage tank through a pipeline, the second heat exchanger is arranged between the second electrolyte circulation pump and the negative electrolyte storage tank, and the second heat exchanger is connected to the thermal power unit.

[0007] The thermal power unit includes a boiler, a steam turbine, a condenser and a cooling tower. The steam turbine is connected to the boiler, the condenser is connected to the steam turbine, the condenser is connected to the boiler through a feed water pump, the cooling tower is connected to the inlet of the condenser through a circulating cooling water pump, and the outlet of the condenser is connected to the cooling tower through a pipeline.

[0008] The water inlet pipe and the water outlet pipe of the first heat exchanger are both connected to the pipeline from the cooling tower to the condenser, and a first electric regulating valve is arranged on the water inlet pipe of the first heat exchanger; the water inlet pipe and the water outlet pipe of the second heat exchanger are both connected to the pipeline from the cooling tower to the condenser, and a second electric regulating valve is arranged on the water inlet pipe of the second heat exchanger.

[0009] The positive electrode electrolyte working area and the negative electrode electrolyte working area are respectively connected to a first temperature sensor and a second temperature sensor, the first temperature sensor is electrically connected to the first electric regulating valve, and the second temperature sensor is electrically connected to the second electric regulating valve.

[0010] A first positive liquid supply pipe and a second positive liquid supply pipe are arranged in parallel between the first electrolyte circulation pump and the positive electrolyte working area, a second stop valve is arranged on the first positive liquid supply pipe, a first stop valve is arranged on the second positive liquid supply pipe, and the first heat exchanger is arranged on the second positive liquid supply pipe.

[0011] A first negative electrode liquid supply pipe and a second negative electrode liquid supply pipe are arranged in parallel between the second electrolyte circulation pump and the negative electrode electrolyte working area, a third stop valve is arranged on the first negative electrode liquid supply pipe, a fourth stop valve is arranged on the second negative electrode liquid supply pipe, and the second heat exchanger is arranged on the second negative electrode liquid supply pipe.

[0012] The first electric regulating valve is electrically connected to the first stop valve and the second stop valve.

[0013] The second electric regulating valve is electrically connected to the third stop valve and the fourth stop valve.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The circulating cooling water generated by the operation of thermal power units is used to efficiently cool the electrolyte of the all-vanadium liquid flow battery that heats up due to electrochemical reactions during the charging and discharging process, so that the electrolyte temperature of the all-vanadium liquid flow battery is always at the optimal temperature, improving the charging and discharging efficiency of the all-vanadium liquid flow battery and extending its service life, and ensuring the safe and stable operation of the entire energy storage system; the surplus circulating cooling water generated during the operation of thermal power units is used to cool the electrolyte of the all-vanadium liquid flow battery, which not only improves the operating efficiency of the all-vanadium liquid flow battery system, but also reduces the construction and operation costs of the all-vanadium liquid flow battery energy storage system, realizing efficient reuse of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the system of the present invention; In the figure: 1 is a boiler, 2 is a feed water pump, 3 is a steam turbine, 4 is a condenser, 5 is a circulating cooling water pump, 6 is a cooling tower, 7 is a positive electrode electrolyte storage tank, 8 is a first electrolyte circulation pump, 9 is a second stop valve, 10 is a first stop valve, 11 is a first heat exchanger, 12 is a first electric regulating valve, 13 is a first temperature sensor, 14 is a battery stack, 15 is a second temperature sensor, 16 is a third stop valve, 17 is a second heat exchanger, 18 is a negative electrode electrolyte storage tank, 19 is a second electrolyte circulation pump, 20 is a fourth stop valve, and 21 is a second electric regulating valve. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from the description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0018] like Figure 1As shown, a vanadium liquid flow battery cooling system using circulating cooling water of a thermal power unit includes a thermal power unit and a vanadium liquid flow battery unit; the vanadium liquid flow battery unit includes a positive electrode electrolyte storage tank 7, a first heat exchanger 11, a battery stack 14, a second heat exchanger 17 and a negative electrode electrolyte storage tank 18, a positive electrode electrolyte working area and a negative electrode electrolyte working area are arranged in the battery stack, the positive electrode electrolyte storage tank 7 is connected to the positive electrode electrolyte working area through a first electrolyte circulation pump 8, and the positive electrode electrolyte working area is connected to the positive electrode through a pipeline. The first heat exchanger 11 is arranged between the first electrolyte circulation pump 8 and the positive electrolyte storage tank 7, and the first heat exchanger 11 is connected to the thermal power unit; the negative electrolyte working area is connected to the negative electrolyte storage tank 18 through the second electrolyte circulation pump 19, and the negative electrolyte working area is connected to the inlet of the negative electrolyte storage tank 18 through a pipeline, and the second heat exchanger 17 is arranged between the second electrolyte circulation pump 19 and the negative electrolyte storage tank 18, and the second heat exchanger 17 is connected to the thermal power unit. The circulating cooling water generated by the operation of the thermal power unit is used to efficiently cool the electrolyte that is heated due to the electrochemical reaction during the charging and discharging process of the all-vanadium liquid flow battery, so that the electrolyte temperature of the all-vanadium liquid flow battery is always at the optimal temperature, thereby improving the charging and discharging efficiency of the all-vanadium liquid flow battery.

[0019] The first heat exchanger 11 and the second heat exchanger 17 may be in the following forms but are not limited to: a shell and tube heat exchanger, a volumetric heat exchanger, a plate heat exchanger or a fin-tube heat exchanger.

[0020] Preferably, the thermal power unit includes a boiler 1, a steam turbine 3, a condenser 4 and a cooling tower 6, the steam turbine 3 is connected to the boiler 1, the condenser 4 is connected to the steam turbine 3, the condenser 4 is connected to the boiler 1 through a feed water pump 2, the cooling tower 6 is connected to the inlet of the condenser 4 through a circulating cooling water pump 5, and the outlet of the condenser 4 is connected to the cooling tower 6 through a pipeline.

[0021] Preferably, the water inlet pipe and the water outlet pipe of the first heat exchanger 11 are both connected to the pipeline from the cooling tower 6 to the condenser 4, and a first electric regulating valve 12 is provided on the water inlet pipe of the first heat exchanger 11; the water inlet pipe and the water outlet pipe of the second heat exchanger 17 are both connected to the pipeline from the cooling tower 6 to the condenser 4, and a second electric regulating valve 21 is provided on the water inlet pipe of the second heat exchanger 17.

[0022] Preferably, the positive electrolyte working area and the negative electrolyte working area are respectively connected with a first temperature sensor 13 and a second temperature sensor 15, the first temperature sensor 13 is electrically connected to the first electric regulating valve 12, and the second temperature sensor 15 is electrically connected to the second electric regulating valve 21. When the working area temperature is greater than the set working temperature, the first electric valve 12 and the second electric valve 21 are opened, and the pipeline flow is controlled through the first electric regulating valve 12 and the second electric regulating valve 21 according to the real-time temperature feedback from the first temperature sensor 13 and the second temperature sensor 15.

[0023] Preferably, a first positive electrode liquid feeding pipe and a second positive electrode liquid feeding pipe are arranged in parallel between the first electrolyte circulation pump 8 and the positive electrode electrolyte working area, a second stop valve 9 is arranged on the first positive electrode liquid feeding pipe, a first stop valve 10 is arranged on the second positive electrode liquid feeding pipe, and a first heat exchanger 11 is arranged on the second positive electrode liquid feeding pipe. By switching on and off the first stop valve 10 and the second stop valve 9, the flow of the electrolyte through the pipeline is controlled, and whether to connect the first heat exchanger 11 to the pipeline system is selected.

[0024] Preferably, a first negative electrode liquid feeding pipe and a second negative electrode liquid feeding pipe are arranged in parallel between the second electrolyte circulation pump 19 and the negative electrode electrolyte working area, a third stop valve 16 is arranged on the first negative electrode liquid feeding pipe, a fourth stop valve 20 is arranged on the second negative electrode liquid feeding pipe, and a second heat exchanger 17 is arranged on the second negative electrode liquid feeding pipe. By switching on and off the third stop valve 16 and the fourth stop valve 20, the flow of the electrolyte through the pipeline is controlled, and whether to connect the second heat exchanger 17 to the pipeline system is selected.

[0025] Preferably, the first electric regulating valve 12 is electrically connected to the first stop valve 10 and the second stop valve 9. When the first electric regulating valve 12 is opened, the first stop valve 10 is automatically opened, and the second stop valve 9 is automatically closed.

[0026] Preferably, the second electric regulating valve 21 is electrically connected to the third stop valve 16 and the fourth stop valve 20. When the second electric regulating valve 21 is opened, the fourth stop valve 20 is automatically opened, and the third stop valve 16 is automatically closed.

[0027] When the all-vanadium liquid flow battery pack starts to be used, the first temperature sensor 13 and the second temperature sensor 15 monitor the electrolyte temperature in the battery stack 14. After the temperature is higher than the set working temperature, the first temperature sensor 13 and the second temperature sensor 15 send signals to start the first electric regulating valve 12 and the second electric regulating valve 2. At the same time, the first stop valve 10 and the fourth stop valve 20 are also opened, and the circulating cooling water generated by the cooling tower 6 enters the first heat exchanger 11 and the second heat exchanger 17 to exchange heat with the positive and negative electrolytes, thereby reducing the electrolyte temperature.

[0028] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. A vanadium liquid flow battery cooling system using circulating cooling water from a thermal power unit, characterized in that: The invention comprises a thermal power unit and an all-vanadium liquid flow battery unit, wherein the all-vanadium liquid flow battery unit comprises a positive electrolyte storage tank (7), a first heat exchanger (11), a battery stack (14), a second heat exchanger (17) and a negative electrolyte storage tank (18), wherein a positive electrolyte working area and a negative electrolyte working area are arranged in the battery stack, wherein the positive electrolyte storage tank (7) is connected to the positive electrolyte working area via a first electrolyte circulation pump (8), wherein the positive electrolyte working area is connected to an inlet of the positive electrolyte storage tank (7) via a pipeline, and wherein the first heat exchanger (11) is provided with a positive electrolyte circulation pump (8). The first heat exchanger (11) is arranged between the first electrolyte circulation pump (8) and the positive electrolyte storage tank (7), and is connected to the thermal power unit; the negative electrolyte working area is connected to the negative electrolyte storage tank (18) via a second electrolyte circulation pump (19), and the negative electrolyte working area is connected to the inlet of the negative electrolyte storage tank (18) via a pipeline; the second heat exchanger (17) is arranged between the second electrolyte circulation pump (19) and the negative electrolyte storage tank (18), and the second heat exchanger (17) is connected to the thermal power unit.

2. The all-vanadium liquid flow battery cooling system using circulating cooling water of a thermal power unit according to claim 1, characterized in that: The thermal power unit comprises a boiler (1), a steam turbine (3), a condenser (4) and a cooling tower (6); the steam turbine (3) is connected to the boiler (1); the condenser (4) is connected to the steam turbine (3); the condenser (4) is connected to the boiler (1) via a feed water pump (2); the cooling tower (6) is connected to the inlet of the condenser (4) via a circulating cooling water pump (5); and the outlet of the condenser (4) is connected to the cooling tower (6) via a pipeline.

3. The all-vanadium liquid flow battery cooling system using circulating cooling water of a thermal power unit according to claim 2, characterized in that: The water inlet pipe and the water outlet pipe of the first heat exchanger (11) are both connected to the pipeline between the cooling tower (6) and the condenser (4), and a first electric regulating valve (12) is provided on the water inlet pipe of the first heat exchanger (11); the water inlet pipe and the water outlet pipe of the second heat exchanger (17) are both connected to the pipeline between the cooling tower (6) and the condenser (4), and a second electric regulating valve (21) is provided on the water inlet pipe of the second heat exchanger (17).

4. The all-vanadium redox flow battery cooling system using circulating cooling water of a thermal power unit according to claim 3, characterized in that: A first temperature sensor (13) and a second temperature sensor (15) are respectively connected to the positive electrode electrolyte working area and the negative electrode electrolyte working area; the first temperature sensor (13) is electrically connected to the first electric regulating valve (12); and the second temperature sensor (15) is electrically connected to the second electric regulating valve (21).

5. The all-vanadium liquid flow battery cooling system using circulating cooling water of a thermal power unit according to claim 4, characterized in that: A first positive electrode liquid supply pipe and a second positive electrode liquid supply pipe are arranged in parallel between the first electrolyte circulation pump (8) and the positive electrode electrolyte working area, a second stop valve (9) is arranged on the first positive electrode liquid supply pipe, a first stop valve (10) is arranged on the second positive electrode liquid supply pipe, and the first heat exchanger (11) is arranged on the second positive electrode liquid supply pipe.

6. The all-vanadium redox flow battery cooling system using circulating cooling water of a thermal power unit according to claim 4, characterized in that: A first negative electrode liquid supply pipe and a second negative electrode liquid supply pipe are arranged in parallel between the second electrolyte circulation pump (19) and the negative electrode electrolyte working area, a third stop valve (16) is arranged on the first negative electrode liquid supply pipe, a fourth stop valve (20) is arranged on the second negative electrode liquid supply pipe, and the second heat exchanger (17) is arranged on the second negative electrode liquid supply pipe.

7. The all-vanadium redox flow battery cooling system using circulating cooling water of a thermal power unit according to claim 5, characterized in that: The first electric regulating valve (12) is electrically connected to the first stop valve (10) and the second stop valve (9).

8. The all-vanadium redox flow battery cooling system using circulating cooling water of a thermal power unit according to claim 6, characterized in that: The second electric regulating valve (21) is electrically connected to the third stop valve (16) and the fourth stop valve (20).

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