Temperature control heat recovery system of flow battery

Abstract

The utility model belongs to the technical field of flow batteries, and particularly relates to a temperature control heat recovery system of a flow battery. The utility model provides a temperature control heat recovery system of a flow battery, which can be used for heating domestic and production water by arranging a compressor, a condenser, an expansion valve, a heat exchanger for hot water, a hot water tank unit and a hot water pump on a heat exchanger for an electric pile. The purposes of recovering heat and avoiding waste are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid flow batteries, and in particular relates to a temperature control heat recovery system of a liquid flow battery. Background Art

[0002] Liquid flow battery refers to a renewable energy storage technology based on liquid electrolytes. Its structure mainly consists of two electrolyte tanks and one battery stack, which stores and releases energy through ion exchange.

[0003] The main difference between flow batteries and relatively common lithium batteries is that the electrolyte tank and battery stack of the former can be connected by pipes, so there is no need to aggregate structures such as electrolytes and electrodes in a relatively concentrated area like lithium batteries.

[0004] Therefore, the outstanding advantages of flow batteries include: long-term energy storage, high safety, long cycle life, high efficiency, and no geographical constraints. Generally, flow batteries are not suitable for small portable devices such as mobile phones and computers, but are mostly used in power stations, factories, and large public places such as shopping malls and hospitals.

[0005] On the other hand, the normal use of flow batteries also depends on the appropriate electrolyte temperature. If the temperature of the electrolyte is too high, the electrolyte will be easily crystallized, which will eventually reduce the battery performance. Therefore, the existing common flow batteries are generally equipped with an electrolyte cooling structure, that is, the above-mentioned temperature control system.

[0006] For example, a Chinese utility model patent with authorization announcement number CN214797488U and authorization announcement date 2021.11.19 discloses an electrolyte temperature control device for a vanadium liquid flow battery, including a water-cooling box for containing cooling water, the water-cooling box is provided with multiple liquid inlets and multiple liquid outlets for transmitting electrolyte, and one side of the water-cooling box is provided with a water inlet and a water outlet for transmitting cooling circulating water, and the water-cooling box is provided with multiple tubes and multiple tube brackets for transmitting electrolyte, the tubes are arranged on the tube brackets in a coiled manner, one end of the tube is fixedly connected to the liquid inlet, and the other end of the tube is fixedly connected to the liquid outlet.

[0007] The electrolyte temperature control device in this utility model patent has the following general structural principles and advantages: by improving the internal structure of the water-cooling box and by arranging the tube body on the tube body bracket in a coiled manner, it is ensured that the length of the electrolyte transmission path in the water-cooling box is greatly increased while the overall volume of the water-cooling box is small, the heat exchange time of the electrolyte in the water-cooling box is effectively increased, and the temperature control effect of the electrolyte temperature control device is improved.

[0008] However, in actual use, the electrolyte temperature control device still has at least the following shortcomings, which are also the technical problems to be solved by the utility model, namely:

[0009] The large amount of heat generated during the electrolyte cooling and temperature control process is difficult to be effectively utilized, which leads to serious heat waste.

[0010] Therefore, in summary, there is an urgent need for a temperature control system with a heat recovery function to cool the electrolyte and reuse the discharged heat. Utility Model Content

[0011] The utility model provides a temperature-controlled heat recovery system for a liquid flow battery, which can achieve the purpose of heat recovery and avoid waste by arranging a compressor, a condenser, an expansion valve, a hot water heat exchanger, a hot water tank unit, and a hot water pump on a heat exchanger for a battery stack, so that the heat originally directly dissipated on the temperature-controlled circulation pipeline can be used to heat domestic and production water.

[0012] The technical solution adopted by the utility model to solve the above-mentioned problem is: a temperature-controlled heat recovery system for a liquid flow battery, the structure of which includes a heat exchanger for a battery stack, a compressor, a condenser, and an expansion valve that are connected in sequence to form a circulation pipeline, and also includes a hot water heat exchanger arranged on the circulation pipeline and located between the compressor and the condenser, a hot water tank unit arranged on the hot water heat exchanger, and a hot water pump arranged between the hot water heat exchanger and the hot water tank unit.

[0013] A further preferred technical solution is that the circulation pipeline is connected to the pipe side of the hot water heat exchanger.

[0014] A further preferred technical solution is that the hot water tank unit includes a tank body, a water outlet pipe arranged on the tank body and connected to the hot water pump, a return pipe arranged on the tank body and connected to the hot water heat exchanger, and a water replenishment pipe and a hot water supply pipe arranged on the tank body.

[0015] A further preferred technical solution is that: the height of the return pipe is higher than the outlet pipe, and the height of the hot water supply pipe is higher than the water supply pipe.

[0016] A further preferred technical solution is that the hot water tank unit further includes a transverse partition disposed in the tank body.

[0017] A further preferred technical solution is that the shape of the transverse partition is a rectangle, the wide sides of the rectangle are arranged on the two side surfaces of the box body, and the distance between the long sides of the rectangle and the inner side surface of the box body is 2-5 cm.

[0018] A further preferred technical solution is that the number of the transverse partitions is 10-30, and they are evenly spaced in a linear arrangement in the vertical direction.

[0019] A further preferred technical solution is that the box is connected to the shell side of the hot water heat exchanger.

[0020] A further preferred technical solution is that insulating flanges are provided between the heat exchanger for the fuel cell stack and the compressor, and between the expansion valve.

[0021] A further preferred technical solution is that a gas-liquid separator is provided between the heat exchanger for the fuel cell stack and the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2 It is a schematic diagram of the position structure of the hot water tank unit in the utility model.

[0024] Figure 3 It is a schematic diagram of the position of the transverse partition in the utility model.

[0025] Figure 4 It is a schematic diagram of the position and shape of the cross partition in the utility model from a top view.

[0026] Figure 5 It is a schematic diagram of the positions of the insulating flange and the gas-liquid separator in the utility model.

[0027] In the figure, the meanings of the symbols are as follows:

[0028] Heat exchanger 11, compressor 12, condenser 13, expansion valve 14 for fuel cell stack;

[0029] Hot water heat exchanger 1, hot water tank unit 2, hot water pump 3, insulating flange 4, gas-liquid separator 5;

[0030] Box body 201 , water outlet pipe 202 , water return pipe 203 , water replenishment pipe 204 , hot water supply pipe 205 , and transverse partition 206 . DETAILED DESCRIPTION

[0031] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0032] As attached Figure 1-5As shown, a temperature-controlled heat recovery system for a liquid flow battery comprises a stack heat exchanger 11, a compressor 12, a condenser 13, and an expansion valve 14 which are sequentially connected to form a circulation pipeline, and further comprises a hot water heat exchanger 1 which is arranged on the circulation pipeline and located between the compressor 12 and the condenser 13, a hot water tank unit 2 which is arranged on the hot water heat exchanger 1, and a hot water pump 3 which is arranged between the hot water heat exchanger 1 and the hot water tank unit 2.

[0033] In this embodiment, the stack heat exchanger 11, compressor 12, condenser 13, and expansion valve 14 correspond to the four most basic phase change / heat exchange steps in the refrigeration pipeline. The above four can be used in the manner of the prior art to achieve:

[0034] First, the relatively high-temperature liquid flow battery electrolyte enters the stack heat exchanger 11, and the required relatively low-temperature electrolyte can be discharged at another nozzle of the heat exchanger, thereby ensuring the long-term stable operation of the liquid flow battery;

[0035] Secondly, the heat obtained in the temperature control circulation pipeline is discharged at the condenser 13 to ensure that the electrolyte cooling operation can be carried out continuously.

[0036] Among them, the hot water heat exchanger 1 is arranged "upstream" of the condenser 13, so that all the heat that originally needs to be dissipated by the condenser 13 can be absorbed and taken away by the hot water heat exchanger 1 as much as possible. The removed part of the heat can heat the normal temperature water source, and finally obtain the hot water required for production and life, realizing the effect of heat recovery and reuse.

[0037] In addition, the condenser 13 still needs to be properly opened to dissipate the remaining heat in the circulation pipeline to ensure that the circulation refrigeration effect is still effective. However, at this time, the actual power of the condenser 13 is greatly reduced, so it has the advantages of energy saving and emission reduction.

[0038] In addition, the hot water tank unit 2 has at least the following functions: connecting to the hot water heat exchanger 1, normal temperature water entering, and hot water discharging. The hot water pump 3 is a commercially available product, and a water pump with a certain high temperature resistance is selected, because the water flowing through the hot water pump 3 is a mixture of normal temperature water and hot water, and the water temperature there will be relatively high.

[0039] The circulation pipeline is connected to the pipe side of the hot water heat exchanger 1.

[0040] In this embodiment, the fluid in the circulation pipeline is Freon refrigerant, which does not need to be used in large quantities. A greater degree of heat exchange can be achieved only through the pipe pass in the hot water heat exchanger 1 which occupies a smaller space.

[0041] Generally, the sealing degree of the tube side of the hot water heat exchanger 1 is higher than that of the shell side, and the damage caused by the leakage of Freon refrigerant is relatively large. Based on this, the above refrigerant should also flow through the tube side.

[0042] The hot water tank unit 2 includes a tank body 201, a water outlet pipe 202 arranged on the tank body 201 and connected to the hot water pump 3, a water return pipe 203 arranged on the tank body 201 and connected to the hot water heat exchanger 1, and a water replenishment pipe 204 and a hot water supply pipe 205 arranged on the tank body 201.

[0043] In this embodiment, the box body 201 is in the shape of a cuboid, the water outlet pipe 202 and the water return pipe 203 are a group, and the water replenishment pipe 204 and the hot water supply pipe 205 are a group, which are respectively arranged on two symmetrical sides of the box body 201.

[0044] The water supply pipe 204 is connected to a tap water pipe, a switch valve is provided on the hot water supply pipe 205, and a box cover is provided on the box body 201.

[0045] When the hot water tank unit 2 is in use, the water outlet pipe 202 and the water return pipe 203 must be open, but the water replenishment pipe 204 and the hot water supply pipe 205 are not necessarily opened all the time.

[0046] When the water temperature in the box 201 is too high, the water supply pipe 204 must be opened. Even if there is no demand for hot water in the production and living environment at this time, the hot water supply pipe 205 should be opened to discharge and temporarily store some hot water.

[0047] The height of the water return pipe 203 is higher than that of the water outlet pipe 202 , and the height of the hot water supply pipe 205 is higher than that of the water replenishment pipe 204 .

[0048] In this embodiment, the water temperature at the water outlet pipe 202 is slightly lower than that at the water return pipe 203 , while the water temperature at the water replenishment pipe 204 is significantly lower than that at the water outlet pipe 202 .

[0049] Therefore, in the hot water heat exchanger 1, relatively low-temperature water "enters from the bottom and exits from the top", and extremely high-temperature refrigerant "enters from the top and exits from the bottom", and the flow directions of the two are opposite, so the heat exchange efficiency of the two can be relatively high.

[0050] The hot water tank unit 2 further includes a transverse partition 206 disposed in the tank body 201 .

[0051] In this embodiment, for the box body 201, it is necessary to: discharge room temperature water as much as possible from the water outlet pipe 202 to reduce the mixing ratio of hot water, and to allow the box body 201 to circulate vertically to form a circulating water flow, and it cannot be completely closed.

[0052] Therefore, the function of the transverse partition 206 is to reduce the effective flow area of ​​the box body 201 in the vertical direction and to perform appropriate internal sealing on the box body 201 .

[0053] The material of the transverse partition 206 is foamed plastic which is not good at conducting heat.

[0054] The shape of the transverse partition 206 is a rectangle, the wide sides of the rectangle are arranged on the two side surfaces of the box body 201, and the distance between the long sides of the rectangle and the inner side surface of the box body 201 is 2-5 cm.

[0055] In this embodiment, the two "gaps" on both sides of the transverse partition 206, each with a width of 2-5 cm, are the vertical effective flow areas of the box body 201, ensuring that the box body 201 has a relatively small but sufficient vertical flow intensity of the water body.

[0056] The number of the transverse partitions 206 is 10-30, and they are evenly spaced in a linear arrangement in the vertical direction.

[0057] In this embodiment, the 10-30 transverse partitions 206 are stacked vertically to ensure that the blocking effect on the water body is sufficient and appropriate.

[0058] The box body 201 is connected to the shell side of the hot water heat exchanger 1 .

[0059] In this embodiment, the hot water heat exchanger 1 is a single-pass structure, which has a more direct heat exchange effect compared to a double-pass structure.

[0060] The reason for setting hot water to pass through the shell is:

[0061] First, hot water leaks less than refrigerant, although it is also a leak.

[0062] Second, the shell side volume of the hot water heat exchanger 1 can be used to supplement the volume of the tank 201, thereby improving the overall heat recovery level.

[0063] Correspondingly, the heat exchanger 11 for the fuel cell stack is also a single-pass structure, and the refrigerant also passes through the tube side of the heat exchanger.

[0064] Insulating flanges 4 are provided between the stack heat exchanger 11 and the compressor 12 , and between the expansion valve 14 .

[0065] In this embodiment, the insulating flange 4 is a commercially available product, and its function is: even if the electrolyte of the flow battery leaks at the heat exchanger 11 for the battery stack, the compressor 12 and the expansion valve 14 will not be energized, and the other equipment will be even less likely to be energized, thereby protecting on-site operators.

[0066] Of course, Freon refrigerant itself is not conductive.

[0067] A gas-liquid separator 5 is also provided between the stack heat exchanger 11 and the compressor 12 .

[0068] In this embodiment, the gas-liquid separator 5 is a commercially available product, and its function is to remove and collect liquid droplets mixed in the gas at the air inlet end of the compressor 12, otherwise the compressor 12 is prone to harmful liquid hammer and is easily damaged.

[0069] The above is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but the utility model is not limited to the above implementation. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the utility model. These are all non-creative modifications and are protected by patent law as long as they are within the scope of the claims of the utility model.

Claims

1. A temperature control heat recovery system for a liquid flow battery, comprising a heat exchanger (11), a compressor (12), a condenser (13), and an expansion valve (14) connected in sequence to form a circulation pipeline, characterized in that: It also includes a hot water heat exchanger (1) arranged on the circulation pipeline and located between the compressor (12) and the condenser (13), a hot water tank unit (2) arranged on the hot water heat exchanger (1), and a hot water pump (3) arranged between the hot water heat exchanger (1) and the hot water tank unit (2).

2. The temperature control heat recovery system of a flow battery according to claim 1, characterized in that: The circulation pipeline is connected to the pipe side of the hot water heat exchanger (1).

3. The temperature control heat recovery system of a flow battery according to claim 1, characterized in that: The hot water tank unit (2) comprises a tank body (201), a water outlet pipe (202) arranged on the tank body (201) and connected to the hot water pump (3), a water return pipe (203) arranged on the tank body (201) and connected to the hot water heat exchanger (1), and a water replenishment pipe (204) and a hot water supply pipe (205) arranged on the tank body (201).

4. The temperature control heat recovery system for a flow battery according to claim 3, characterized in that: The height of the water return pipe (203) is higher than that of the water outlet pipe (202), and the height of the hot water supply pipe (205) is higher than that of the water replenishment pipe (204).

5. The temperature control heat recovery system of a flow battery according to claim 3, characterized in that: The hot water tank unit (2) further comprises a transverse partition (206) arranged in the tank body (201).

6. The temperature control heat recovery system of a flow battery according to claim 5, characterized in that: The shape of the transverse partition (206) is a rectangle, the wide sides of the rectangle are arranged on two side surfaces of the box body (201), and the distance between the long sides of the rectangle and the inner side surface of the box body (201) is 2-5 cm.

7. The temperature control heat recovery system for a flow battery according to claim 5, characterized in that: The number of the transverse partitions (206) is 10-30, and they are evenly spaced in a linear arrangement in the vertical direction.

8. The temperature control heat recovery system of a flow battery according to claim 3, characterized in that: The box body (201) is connected to the shell side of the hot water heat exchanger (1).

9. The temperature control heat recovery system of a flow battery according to claim 1, characterized in that: Insulating flanges (4) are provided between the heat exchanger (11) for the fuel cell stack and the compressor (12), and between the expansion valve (14).

10. The temperature control heat recovery system of a flow battery according to claim 1, characterized in that: A gas-liquid separator (5) is also provided between the heat exchanger (11) for the fuel cell stack and the compressor (12).

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