CN113130944B

CN113130944B - Device and method for cleaning residual liquid of cell stack suitable for hydrochloric acid series flow battery

Info

Publication number: CN113130944B
Application number: CN202110288302.3A
Authority: CN
Inventors: 韩峰; 申鹏; 吴珂科; 俞高伟; 张辉
Original assignee: Shanghai Power Equipment Research Institute Co Ltd
Current assignee: Shanghai Power Equipment Research Institute Co Ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2022-02-22
Anticipated expiration: 2041-03-18
Also published as: CN113130944A

Abstract

The invention relates to the technical field of flow batteries, in particular to a device and a method for cleaning residual liquid in a battery stack, which are suitable for a hydrochloric acid flow battery. The cleaning device comprises a blowing mechanism and a waste liquid tank for receiving electrolyte discharged from a liquid outlet of the cell stack, wherein the blowing mechanism comprises a barrel for conveying purging gas, a blower arranged in the barrel, a heater and a humidifier for heating and humidifying the purging gas in the barrel, and the two ends of the barrel are respectively provided with an air inlet communicated with a gas source of the purging gas and an air outlet communicated with a liquid inlet of the cell stack. The cleaning method adopts the cleaning device, and the working states of the blower, the heater and the humidifier are controlled by the controller according to pressure value information, temperature value information and humidity value information measured by the pressure transmitter, the temperature sensor and the hygrometer, so that the pressure value, the temperature value and the humidity value of the purge gas at the air outlet of the cylinder are increased and maintained in a target range. Deep cleaning of residual electrolyte inside the cell stack can be achieved.

Description

Device and method for cleaning residual liquid of cell stack suitable for hydrochloric acid series flow battery

Technical Field

The invention relates to the technical field of flow batteries, in particular to a device and a method for cleaning residual liquid in a battery stack, which are suitable for a hydrochloric acid flow battery.

Background

The flow battery is a novel efficient electrochemical energy storage device, breaks through the solid volume and constant volume limitations of electrolyte, and realizes the circulation flow of the electrolyte and the flexible and variable states of system capacity and power. Meanwhile, the flow battery is a secondary battery technology in which an active material is present in a liquid electrolyte. The positive and negative electrolytes are respectively stored in the positive and negative storage tanks, and under the action of the circulating pump, the positive and negative electrolytes respectively flow from the storage tanks to the positive and negative electrodes of the battery stack to participate in electrochemical reaction, so that mutual conversion of electric energy and chemical energy is realized, and then the electric energy and the chemical energy flow back to the positive and negative storage tanks.

The advantage of the flow battery is that the system capacity is independent of power and is easily adjustable. The variables of the control capacity and the power are the capacity of the electrolyte of the storage tank and the size and the number of the galvanic piles respectively. The system capacity and power can be increased by only increasing the electrolyte capacity and the area and number of the cell stacks. Meanwhile, the flow battery is environment-friendly, high in safety performance, free of pollution during system operation, free of explosion and ignition risks, simple to operate and stable in operation.

At present, the electrolyte solution of the flow battery is selected flexibly, and the main stream is hydrochloric acid or sulfuric acid solution. Among them, the hydrochloric acid flow battery selects hydrochloric acid with a certain concentration as an electrolyte solution.

The stack in a flow battery as a main component determines the charge and discharge performance of the whole system. As shown in fig. 1, the cell stack 1 is formed by arranging a plurality of cell stack monomers 100, and two sides of the cell stack 1 are respectively provided with a liquid inlet 1a and a liquid outlet 1b for flowing electrolyte into and out of the cell stack 1. As shown in fig. 2, a single cell stack 100 includes a layer of ion exchange membrane 101, two layers of bipolar plates 102 respectively disposed at two sides of the ion exchange membrane 101, two layers of current collecting plates 103 respectively disposed at outer sides of the two layers of bipolar plates 102, two single cell plate frames 104 respectively disposed at outer sides of the two layers of current collecting plates 103, and a cell stack outer end plate 105 respectively disposed at outer sides of the two single cell plate frames 104.

Before the flow battery system is operated commercially, the battery stack 1 needs to be tested, and the testing performance is good so that the flow battery system can be applied. The test results were divided into the following two cases: in the first situation, if the test result is in line with expectation, the cell stack 1 needs to be dismantled on a test bench and moved to a project site for operation, after the test operation, the electrolyte in the cell stack 1 needs to be discharged, then the cell stack 1 is dismantled from the test bench, and during the period, the interior of the cell stack 1 is required to be isolated from nitrogen; in case of the second case, if the test results are seriously deviated from expectations and there is no remedial measure, it is necessary to detach the cell stack 1 from the test bench and completely disassemble the cell stack 1 for the reason. In both cases, the electrolyte inside the cell stack 1 needs to be purged, and the former needs to be carried out in a nitrogen isolation manner. However, as the flow channel in the collector plate 103 is long and thin, the form is complex, and the adsorption effect of the carbon felt bipolar plate 102 is strong, a lot of electrolyte is often left in the cell stack 1 and cannot be discharged completely, so that the secondary charge and discharge performance and efficiency of the cell stack 1 are seriously affected under the circumstances, and the overall performance of the redox flow battery system is low; under the second situation, a large amount of electrolyte flows around due to lack of restraint caused by sealing failure in the complete dismantling process of the cell stack 1, and a large amount of hydrogen chloride gas volatilizes, so that the environment for dismantling the cell stack is very severe, and the health of dismantling operators is seriously influenced. Therefore, a device for cleaning the residual liquid of the cell stack is needed.

Disclosure of Invention

The invention aims to provide a device and a method for cleaning residual liquid of a cell stack, which are suitable for a hydrochloric acid flow battery, and can realize deep cleaning of residual electrolyte in the cell stack so as to overcome the defects in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides a heap raffinate belt cleaning device suitable for hydrochloric acid is redox flow battery, including sending into the gas blowing mechanism that sweeps gas and accepting the waste liquid jar of the liquid outlet exhaust electrolyte of heap to the inlet of heap, gas blowing mechanism is including carrying the barrel that sweeps gas, locate the air-blower in the barrel, carry out the heater that heats to the gas that sweeps in the barrel and carry out the humidifier that humidifies to the gas that sweeps in the barrel, the both ends of barrel are equipped with respectively with the air intake that sweeps gas source intercommunication and the air outlet that is linked together with the inlet of heap.

Preferably, a filter screen is arranged at the air inlet.

Preferably, the blower, the heater and the humidifier are sequentially arranged along a direction in which the air inlet is directed to the air outlet.

Preferably, the heater is a heating wire.

Preferably, the blowing mechanism further comprises a power module for supplying power to the blower and the heating wire.

Preferably, the air outlet is communicated with the liquid inlet of the cell stack through an air injection pipeline, and a valve is arranged on the air injection pipeline.

Preferably, a PH meter for measuring the PH value of the liquid in the waste liquid tank is arranged in the waste liquid tank.

Preferably, the blowing mechanism further comprises a controller, and a pressure transmitter, a temperature sensor and a hygrometer which are respectively used for measuring the pressure value, the temperature value and the humidity value of the blowing gas at the air outlet, and the blower, the heater, the humidifier, the pressure transmitter, the temperature sensor and the hygrometer are all connected with the controller.

Preferably, the controller is connected with the blower through a speed regulator.

A battery stack residual liquid cleaning method suitable for a hydrochloric acid series flow battery is characterized in that the battery stack residual liquid cleaning device suitable for the hydrochloric acid series flow battery is adopted, a pressure value target range, a temperature value target range and a humidity value target range of purging gas sent into a liquid inlet of the battery stack are set, the battery stack residual liquid cleaning device is started to purge the interior of the battery stack, a controller controls working states of a blower, a heater and a humidifier according to pressure value information measured by a pressure transmitter, temperature value information measured by a temperature sensor and humidity value information measured by a hygrometer respectively, and the pressure value, the temperature value and the humidity value of the purging gas at an air outlet are increased and are maintained in the pressure value target range, the temperature value target range and the humidity value target range respectively.

Compared with the prior art, the invention has the remarkable progress that:

form the inlet that has certain pressure's high temperature and high humidity and sweep gas and send it into the battery through the blowing mechanism, continuously sweep the battery pile inside, can be with higher speed the inside electrolyte that remains of battery pile volatilizees and avoids remaining electrolyte concentration too high, it is high-efficient, thoroughly will remain in the liquid outlet discharge to the waste liquid jar of electrolyte from the battery pile, and protect the cleaning process in the battery pile not suffer destruction, realize the inside degree of depth cleaning who remains electrolyte of battery pile, can avoid tearing open a series of safety that the in-process brought because of the inside electrolyte that remains of battery pile is not completely discharged, the problem in aspects such as environmental protection.

Drawings

Fig. 1 is a schematic diagram of the structure of a cell stack in a flow battery.

Fig. 2 is a schematic diagram of a split structure of a cell stack in a flow battery.

Fig. 3 is a schematic structural diagram of a stack residue cleaning apparatus suitable for use in a hydrochloric acid-based flow battery according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a blowing mechanism in a stack residue cleaning device suitable for a hydrochloric acid flow battery according to an embodiment of the present invention.

Fig. 5 is a logic block diagram of a controller in a stack raffinate washing device suitable for use in a hydrochloric acid-based flow battery according to an embodiment of the present invention.

Wherein the reference numerals are as follows:

1 cell stack

1a liquid inlet

1b liquid outlet

100 cell stack monomer

101 ion exchange membrane

102 bipolar plate

103 current collecting plate

104 single-plate battery plate frame

105 outer end plate of cell stack

2 air blowing mechanism

20 controller

201 speed regulator

202 analog-to-digital converter

203 keyboard circuit

204 PWM module

205 display circuit

206 overrun alarm circuit

21 barrel

21a air inlet

21b air outlet

22 blower

23 Heater

24 humidifier

25 filter screen

26 power supply module

27 pressure transmitter

28 temperature sensor

29 hygrometer

3 waste liquid tank

4 gas injection pipeline

5 valve

6 PH meter

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 3 to 5, an embodiment of the device for cleaning the stack residue suitable for the hydrochloric acid flow battery of the present invention is shown. Once the flow cell stack needs to be disassembled, the residual electrolyte inside the stack needs to be cleaned. The device for cleaning the stack residual liquid suitable for the hydrochloric acid-based flow battery in the embodiment is used for cleaning and discharging the residual electrolyte in the hydrochloric acid-based flow battery stack, and the residual electrolyte in the hydrochloric acid-based flow battery stack is hydrochloric acid with a certain concentration.

Referring to fig. 3, the apparatus for cleaning the stack residual liquid suitable for the hydrochloric acid-based flow cell of the present embodiment includes a blowing mechanism 2 and a waste liquid tank 3. The blowing mechanism 2 is connected with the liquid inlet 1a of the cell stack 1 and is used for feeding blowing gas into the liquid inlet 1a of the cell stack 1, residual electrolyte in the cell stack 1 is taken out through the flowing of the blowing gas in the cell stack 1, and the blowing gas and the electrolyte taken out are discharged from the liquid outlet 1b of the cell stack 1. The waste liquid tank 3 is connected with the liquid outlet 1b of the cell stack 1 and is used for receiving the electrolyte discharged from the liquid outlet 1b of the cell stack 1.

Referring to fig. 4, the air blowing mechanism 2 includes a cylinder 21, a blower 22, a heater 23, and a humidifier 24.

The cylinder 21 is used for conveying purge gas, the inside of the cylinder 21 is hollow, and an air inlet 21a and an air outlet 21b are respectively arranged at two ends of the cylinder 21 for the purge gas to pass through. The air inlet 21a of the cylinder 21 is connected to a purge gas source (not shown) for supplying purge gas into the cylinder 21. The air outlet 21b of the cylinder 21 is communicated with the liquid inlet 1a of the cell stack 1, so that the sweeping gas in the cylinder 21 is sent to the liquid inlet 1a of the cell stack 1, namely sent to the interior of the cell stack 1.

The blower 22 is arranged in the cylinder 21, the blower 22 can make the purge gas entering the cylinder 21 form gas flow, the flow of the purge gas is accelerated, and meanwhile, the pressure of the purge gas is increased, so that the purge gas sent into the cell stack 1 keeps a certain pressure, and the purge gas is favorable for taking out residual electrolyte in the cell stack 1.

The heater 23 heats the purging gas in the cylinder 21, the heater 23 can be arranged in the cylinder 21, and the temperature of the purging gas in the cylinder 21 can be increased by heating the heater 23, so that the purging gas fed into the cell stack 1 keeps high temperature, the volatilization of the residual electrolyte in the cell stack 1 is accelerated, the purging efficiency can be improved, and the cleaning and the discharging of the residual electrolyte in the cell stack 1 are thorough.

Humidifier 24 humidifies the purge gas in barrel 21, humidifier 24 can locate on the lateral wall of barrel 21 and be linked together with barrel 21 is inside, the humidity of the purge gas in barrel 21 can be increased through humidifier 24 humidification, so that the purge gas fed into the interior of cell stack 1 keeps high humidity, the concentration of residual electrolyte in cell stack 1 can be prevented from being too high, harmful influence on the internal components of cell stack 1 is avoided, and cell stack 1 is prevented from being damaged in the cleaning process.

From this, the battery pile raffinate belt cleaning device suitable for hydrochloric acid system flow battery of this embodiment, form the high temperature and high humidity that has certain pressure through gas blowing mechanism 2 and sweep gas and send it into inlet 1a of battery pile 1, continuously sweep inside the battery pile 1, can accelerate the inside residual electrolyte of battery pile 1 to volatilize and avoid remaining electrolyte concentration too high, high-efficient, thoroughly will remain electrolyte and discharge to waste liquid tank 3 from the outlet 1b of battery pile 1 in, and protect among the cleaning process battery pile 1 not to suffer destruction, realize the inside deep cleaning of remaining electrolyte of battery pile 1, can avoid taking out a series of safety that the in-process of piling because of battery pile 1 inside residual electrolyte is not completely discharged and is brought, the problem in aspects such as environmental protection.

In this embodiment, the purge gas provided by the purge gas source is preferably nitrogen, i.e. the purge gas source is preferably a nitrogen source. The method is more effective and safer to sweep and remove the residual electrolyte in the cell stack 1 by adopting high-temperature high-humidity nitrogen with certain pressure.

Referring to fig. 3, in the present embodiment, preferably, the air outlet 21b of the cylinder 21 of the air blowing mechanism 2 is communicated with the liquid inlet 1a of the cell stack 1 through the air injection pipeline 4, and the air injection pipeline 4 is provided with a valve 5. The purging gas in the cylinder 21 is sent to the liquid inlet 1a of the cell stack 1 through the gas injection pipeline 4, and the valve 5 controls the on-off of the gas injection pipeline 4 and the flow of the purging gas through the gas injection pipeline 4. Preferably, the gas injection pipeline 4 may be a hose.

Referring to fig. 3, in the present embodiment, it is preferable that a PH meter 6 for measuring a PH of the liquid in the waste liquid tank 3 is provided in the waste liquid tank 3. The PH value of the liquid in the waste liquid tank 3 is measured by the PH meter 6, and the purging and cleaning degree of the residual electrolyte inside the cell stack 1 can be judged. Preferably, the waste liquid tank 3 and the liquid outlet 1b of the cell stack 1 can be connected by a hose, one end of the hose is connected to the liquid outlet 1b of the cell stack 1, the other end of the hose is inserted into the bottom of the waste liquid tank 3, and tap water with neutral PH value can be pre-filled in the waste liquid tank 3. In the process of continuously purging the interior of the cell stack 1 by operating the cell stack residual liquid cleaning device, the purging and cleaning degree of the residual electrolyte in the cell stack 1 can be judged by observing the bubble emerging condition in the waste liquid tank 3 and the liquid PH value in the waste liquid tank 3 measured by the PH meter 6, and after the liquid PH value in the waste liquid tank 3 measured by the PH meter 6 has no obvious fluctuation change, the purging can be stopped for 2-4 minutes, and the purging and cleaning operation of the residual electrolyte in the cell stack 1 is completed once.

Referring to fig. 4, in the present embodiment, preferably, a filter screen 25 is disposed at the air inlet 21a of the cylinder 21, the purge gas provided by the purge gas source enters the cylinder 21 after being filtered by the filter screen 25 at the air inlet 21a of the cylinder 21, and the filter screen 25 filters large particle impurities in the purge gas, so as to prevent the large particle impurities from entering the cell stack 1 and damaging the ion exchange membrane 101.

Referring to fig. 4, in the present embodiment, preferably, the blower 22, the heater 23 and the humidifier 24 are sequentially arranged in a direction in which the air inlet 21a of the drum 21 is directed to the air outlet 21b of the drum 21. Preferably, the blower 22 is disposed at an end of the cylinder 21 near the air inlet 21a of the cylinder 21, the humidifier 24 is disposed at an end of the outer sidewall of the cylinder 21 near the air outlet 21b of the cylinder 21, and the heater 23 is disposed between the blower 22 and the humidifier 24.

Preferably, the rotational speed of the blower 22 in the present embodiment is adjustable. By adjusting the rotation speed of the blower 22, the pressure of the purge gas at the air outlet 21b of the control cylinder 21, that is, the pressure of the purge gas fed into the cell stack 1, can be adjusted and controlled, so that the pressure can meet the actual cleaning and purging operation requirements.

Preferably, the heater 23 in the present embodiment is a heating wire. The heating wire is adopted to heat the sweeping gas in the cylinder body 21, and the heating device has the advantages of being fast in heating and easy in temperature control.

Further, in the present embodiment, the blowing mechanism 2 further includes a power module 26, and the power module 26 supplies power to the blower 22 and the heating wire. Preferably, the power module 26 may include a 24V DC power supply for powering the blower 22 and a 220V power supply for powering the heater wires.

The form of the humidifier 24 in the present embodiment is not limited, and an existing humidifier may be used.

Referring to fig. 4, in the present embodiment, preferably, the blowing mechanism 2 further includes a controller 20, a pressure transmitter 27, a temperature sensor 28 and a hygrometer 29, and the blower 22, the heater 23, the humidifier 24, the pressure transmitter 27, the temperature sensor 28 and the hygrometer 29 are connected to the controller 20. The controller 20 controls the start and stop of the blower 22, the heater 23 and the humidifier 24. The pressure transmitter 27 is used for measuring the pressure value of the purge gas at the air outlet 21b of the cylinder 21, and is connected with the controller 20 in a communication manner through a bus. The temperature sensor 28 is used for measuring the temperature value of the purge gas at the air outlet 21b of the cylinder 21, and is in communication connection with the controller 20 through a bus. The temperature sensor 28 may be a DS18S20 temperature sensor. The hygrometer 29 is used for measuring the humidity of the purge gas at the air outlet 21b of the cylinder 21, and is connected with the controller 20 in a communication manner through a bus. When the residual liquid cleaning device of the cell stack operates, the pressure transmitter 27 transmits the measured pressure value information to the controller 20, the controller 20 receives the pressure value information, adjusts and controls the rotating speed of the blower 22 according to the received pressure value information, so as to adjust and control the pressure value of the purging gas at the air outlet 21b of the cylinder 21, and keep the pressure value of the purging gas at the air outlet 21b of the cylinder 21 within a set pressure value target range; the temperature sensor 28 transmits the measured temperature value information to the controller 20, the controller 20 receives the temperature value information, and adjusts and controls the working state of the heater 23 according to the received temperature value information, so as to adjust and control the temperature value of the purge gas at the air outlet 21b of the cylinder 21, and keep the temperature value of the purge gas at the air outlet 21b of the cylinder 21 within a set temperature value target range; the hygrometer 29 sends the measured humidity information to the controller 20, and the controller 20 receives the humidity information and adjusts and controls the operating state of the humidifier 24 according to the received humidity information, so as to adjust and control the humidity of the purge gas at the outlet 21b of the cylinder 21 and keep the humidity of the purge gas at the outlet 21b of the cylinder 21 within the set humidity target range. From this, when the operation of the battery pile raffinate belt cleaning device of this embodiment washs and sweeps the operation, can carry out real time monitoring and intelligent adjustment to sending into the inside pressure, temperature and the humidity of sweeping the gas of battery pile 1, guarantee that it satisfies the operation requirement and does not exceed the target value scope of settlement, can ensure best cleaning performance to guarantee that battery pile 1 does not receive the destruction.

In addition, the valve 5 on the gas injection pipeline 4 may also be connected to the controller 20, and the controller 20 controls the opening and closing of the valve 5 and adjusts the opening of the control valve 5.

Preferably, the controller 20 is connected to the blower 22 through a governor 201. The speed regulator 201 is a PWM (Pulse Width modulation) speed regulator, and can regulate the rotation speed of the blower 22 by using a Pulse Width modulation method.

Preferably, the controller 20 may be an AT89C51 single chip microcomputer. Referring to fig. 5, the controller 20 may include an analog-to-digital converter 202, a keypad circuit 203, a PWM module 204, a display circuit 205, and an over-limit alarm circuit 206. The analog-to-digital converter 202 is used for converting analog quantity information acquired by the pressure transmitter 27, the temperature sensor 28 and the hygrometer 29 into digital signals. The keyboard circuit 203 is used to edit set values including a target range of temperature value, a target range of pressure value and a target range of humidity value of the purge gas fed to the liquid inlet 1a of the cell stack 1. The PWM module 204 is used for emitting a pulse waveform, and the PWM governor 201 receives and amplifies the pulse waveform emitted by the PWM module 204 to drive the blower 22. The display circuit 205 is used to connect a display screen. The overrun alarm circuit 206 is used for sending an overpressure alarm or an overtemperature alarm when the pressure value of the purge gas at the air outlet 21b of the cylinder 21 exceeds a target range of pressure values or the temperature value exceeds a target range of temperature values. When an overpressure alarm is given, the controller 20 reduces the rotation speed of the blower 22 through the speed governor 201; when an over-temperature alarm is issued, the controller 20 controls the heater 23 to stop heating.

Based on the above device for cleaning stack residual liquid suitable for the hydrochloric acid flow battery, the embodiment of the invention also provides a method for cleaning stack residual liquid suitable for the hydrochloric acid flow battery. The method for cleaning the stack residual liquid suitable for the hydrochloric acid-based flow battery in this embodiment adopts the above apparatus for cleaning the stack residual liquid suitable for the hydrochloric acid-based flow battery in this embodiment, that is, the operation method of the above apparatus for cleaning the stack residual liquid suitable for the hydrochloric acid-based flow battery in this embodiment. Specifically, the method for cleaning the stack residual liquid suitable for the hydrochloric acid flow battery of the present embodiment is as follows.

According to the actual condition of the cleaned and blown cell stack 1, a pressure value target range, a temperature value target range and a humidity value target range of the blowing gas sent into the liquid inlet 1a of the cell stack 1 are set through the controller 20. Preferably, an overpressure alarm value exceeding the target range of pressure values and an overtemperature alarm value exceeding the target range of temperature values may also be set by the controller 20.

Then, the stack residual liquid cleaning device is started to purge the interior of the stack 1, and the controller 20 controls the working state of the blower 22 according to the pressure value information measured by the pressure transmitter 27, namely, controls the rotating speed of the blower 22, so that the pressure value of the purge gas at the air outlet 21b of the cylinder 21 is increased and maintained within the target range of the pressure value, and the rotating speed of the blower 22 is maintained at the rotating speed corresponding to the pressure value; the controller 20 controls the working state of the heater 23 according to the temperature value information measured by the temperature sensor 28, so that the temperature value of the purge gas at the air outlet 21b of the cylinder 21 is increased and maintained within the target temperature value range, and the working state of the heater 23 is maintained in the working state corresponding to the temperature value; the controller 20 controls the operating state of the humidifier 24 according to the humidity value information measured by the hygrometer 29, so that the humidity value of the purge gas at the air outlet 21b of the cylinder 21 is increased and maintained within the target humidity value range, and the operating state of the humidifier 24 is maintained in the operating state corresponding to the humidity value.

In the purging process, if the pressure value of the purging gas at the air outlet 21b of the cylinder 21 measured by the pressure transmitter 27 exceeds the target range of the pressure value (that is, an overpressure alarm value is reached), the controller 20 sends out an overpressure alarm, and the controller 20 reduces the rotating speed of the blower 22 through the speed regulator 201 to reduce the pressure of the purging gas at the air outlet 21b of the cylinder 21 until the pressure value of the purging gas at the air outlet 21b of the cylinder 21 measured by the pressure transmitter 27 falls within the target range of the pressure value, and the alarm is released; if the temperature value of the purge gas at the air outlet 21b of the cylinder 21 measured by the temperature sensor 28 exceeds the target temperature value range (i.e. the over-temperature alarm value is reached), the controller 20 sends out an over-temperature alarm, and the controller 20 controls the heater 23 to stop heating, so as to reduce the temperature of the purge gas at the air outlet 21b of the cylinder 21 until the temperature value of the purge gas at the air outlet 21b of the cylinder 21 measured by the temperature sensor 28 falls within the target temperature value range, and the alarm is released.

In the purging process, the purging and cleaning degree of the residual electrolyte in the cell stack 1 can be judged by observing the bubbling condition in the waste liquid tank 3 and the pH value of the liquid in the waste liquid tank 3 measured by the pH meter 6, and when the pH value of the liquid in the waste liquid tank 3 measured by the pH meter 6 has no obvious fluctuation change, the purging is continued for 2-4 minutes, the purging can be stopped, and the cleaning and purging operation of the residual electrolyte in the cell stack 1 is completed.

The method for cleaning the residual liquid of the cell stack suitable for the hydrochloric acid flow battery comprises the steps of forming high-temperature high-humidity purging gas with certain pressure through the blowing mechanism 2, sending the high-temperature high-humidity purging gas into the liquid inlet 1a of the cell stack 1, continuously purging the interior of the cell stack 1, accelerating volatilization of residual electrolyte in the cell stack 1 and avoiding overhigh concentration of the residual electrolyte, efficiently and thoroughly discharging the residual electrolyte from the liquid outlet 1b of the cell stack 1 into the waste liquid tank 3, protecting the cell stack 1 from being damaged in the cleaning process, realizing deep cleaning of the residual electrolyte in the cell stack 1, and avoiding a series of problems in the aspects of safety, environmental protection and the like caused by incomplete discharge of the residual electrolyte in the cell stack 1 in the stack disassembly process.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a heap raffinate belt cleaning device suitable for hydrochloric acid is redox flow battery, its characterized in that, includes to liquid inlet (1a) of heap (1) send into the blowing mechanism (2) that sweeps gas and accept waste liquid jar (3) of the liquid outlet (1b) discharged electrolyte of heap (1), blowing mechanism (2) including carry sweep gaseous barrel (21), locate air-blower (22) in barrel (21), right sweep gas in barrel (21) and carry out heater (23) that heat and right sweep gas in barrel (21) and carry out humidifier (24) of humidification, the both ends of barrel (21) are equipped with respectively with sweep air intake (21a) that the gas source is linked together and with air outlet (21b) that the liquid inlet (1a) of heap (1) is linked together.

2. The device for cleaning the residual liquid of the battery pile suitable for the hydrochloric acid series flow battery is characterized in that a filter screen (25) is arranged at the air inlet (21 a).

3. The stack raffinate washing apparatus for hydrochloric acid-based flow batteries according to claim 1, wherein said blower (22), said heater (23) and said humidifier (24) are arranged in this order along a direction in which said air inlet (21a) is directed toward said air outlet (21 b).

4. The apparatus for cleaning the residual liquid of the stack suitable for the hydrochloric acid-based flow battery according to claim 1, wherein the heater (23) is a heating wire.

5. The apparatus for cleaning the residual liquid of the cell stack suitable for the hydrochloric acid series flow battery according to claim 4, wherein the blowing mechanism (2) further comprises a power module (26) for supplying power to the blower (22) and the heating wire.

6. The device for cleaning the residual liquid in the cell stack suitable for the hydrochloric acid-series flow battery, according to claim 1, is characterized in that the air outlet (21b) is communicated with the liquid inlet (1a) of the cell stack (1) through an air injection pipeline (4), and a valve (5) is arranged on the air injection pipeline (4).

7. The apparatus for cleaning the residual liquid of the stack suitable for the hydrochloric acid series flow battery according to claim 1, characterized in that a pH meter (6) for measuring the pH value of the liquid in the waste liquid tank (3) is arranged in the waste liquid tank (3).

8. The device for cleaning the residual liquid in the battery stack suitable for the hydrochloric acid series flow battery according to any one of claims 1 to 7, wherein the blowing mechanism (2) further comprises a controller (20) and a pressure transmitter (27), a temperature sensor (28) and a hygrometer (29) for measuring a pressure value, a temperature value and a humidity value of the purge gas at the air outlet (21b), respectively, and the blower (22), the heater (23), the humidifier (24), the pressure transmitter (27), the temperature sensor (28) and the hygrometer (29) are all connected with the controller (20).

9. The apparatus for washing the residual liquid of the stack suitable for the hydrochloric acid series flow battery as claimed in claim 8, wherein the controller (20) is connected with the blower (22) through a speed regulator (201).

10. A method for cleaning a residual liquid in a cell stack suitable for a hydrochloric acid flow battery, according to claim 9, wherein the device for cleaning a residual liquid in a cell stack suitable for a hydrochloric acid flow battery is used, a pressure value target range, a temperature value target range and a humidity value target range of a purge gas fed into a liquid inlet (1a) of a cell stack (1) are set, the device for cleaning a residual liquid in a cell stack (1) is started to purge the interior of the cell stack (1), and a controller (20) controls the working states of a blower (22), a heater (23) and a humidifier (24) according to pressure value information measured by a pressure transmitter (27), temperature value information measured by a temperature sensor (28) and humidity value information measured by a hygrometer (29), respectively, so that the pressure value, humidity value and humidity value of the purge gas at an air outlet (21b) are adjusted, The temperature value and the humidity value are raised and maintained within the pressure value target range, the temperature value target range, and the humidity value target range, respectively.