CN115117399A - Gas humidifying device for fuel cell test - Google Patents

Abstract

The invention provides a gas humidifying device for fuel cell testing, belongs to the technical field of fuel cells, and solves the problems that in the prior art, the gas humidity is difficult to adjust rapidly according to the operation requirement of a galvanic pile, and the application range is limited. The device is suitable for all working points and comprises a gas humidifying tank, a first tank body filled with constant-temperature hot water, a second tank body filled with constant-temperature cold water, a first water pump, a second water pump and a controller. The gas humidifying tank is internally provided with a heater and a cooling plate, a water inlet is connected with the first tank body through a first water pump to form a rough adjusting temperature rising branch, and a water inlet II is connected with the second tank body through a second water pump to form a rough adjusting cooling branch. The control method comprises the following steps: determining a dew point temperature corresponding to the target humidity; acquiring the actual water temperature in the gas humidification tank at the current moment, and comparing the actual water temperature with the dew point temperature to start a corresponding coarse adjustment branch to inject water into the gas humidification tank; after the water injection is finished, the heater or the cooling plate is started to precisely adjust the water temperature, so that the air is introduced after the actual water temperature in the gas humidification tank reaches the dew point temperature.

Description

A gas humidification device for fuel cell testing

technical field

The present invention relates to the technical field of fuel cells, in particular to a gas humidification device used for fuel cell testing.

Background technique

Fuel cell is an electrochemical power generation device, which is not limited by the Carnot cycle, has high energy conversion efficiency, no pollution and no noise, and has become an ideal energy utilization method for a new generation. With the maturity of fuel cell technology, its commercial application has broad prospects for development.

In the prior art, fuel cell testing equipment is generally used to optimize and verify the structure and material of the fuel cell. Specifically, the supply of fuel gas, air and cooling water is provided for the stack. The operating parameters of the stack include gas flow, temperature, Control of humidity, pressure, etc., monitor the real-time operating status of the stack, and complete data recording.

At present, the gas humidification tank is generally used to humidify the gas in the fuel cell test equipment, and the humidity control is realized through the water temperature control in the gas humidification tank. However, it takes too long to make the gas humidity unable to respond quickly according to the operation requirements of the stack. Some test equipment uses dry and wet gas mixing to achieve rapid gas humidification, but a more accurate flow control (flow meter) needs to be added to ensure the dry gas volume, which increases the equipment cost, and requires a long pipeline to ensure A good mix of dry and wet air. Excessive length of the pipeline will affect the temperature and humidity of the gas entering the stack, and the flow control range of the flowmeter will limit the applicable range of rapid humidification.

SUMMARY OF THE INVENTION

In view of the above analysis, the embodiments of the present invention aim to provide a gas humidification device for fuel cell testing, so as to solve the problem that it is difficult to quickly adjust the gas humidity according to the operation requirements of the stack and the applicable range is limited in the prior art.

On the one hand, an embodiment of the present invention provides a gas humidification device for fuel cell testing, including a gas humidification tank, a first tank with constant temperature hot water, a second tank with constant temperature cold water, and a first water pump , a second water pump and a controller; wherein,

The gas humidification tank is provided with a heater and a cooling plate for precise temperature adjustment of the liquid in the tank. The water inlet of the gas humidification tank is connected to the water outlet of the first tank body through the first water pump to form a rough adjustment and heating branch. The second water pump is connected to the water outlet of the second tank to form a coarse adjustment and cooling branch;

The controller is used to determine the dew point temperature corresponding to the target humidity after startup; and, obtain the actual water temperature in the gas humidification tank at the current moment, and start the coarse adjustment heating branch or the coarse adjustment cooling branch according to the comparison result of the actual water temperature and the dew point temperature. Water is injected into the gas humidification tank; and, after the water injection is completed, the heater or cooling plate in the gas humidification tank is started to further finely adjust the water temperature, so that the actual water temperature in the gas humidification tank reaches the dew point temperature, and then the gas humidification tank is ventilated.

The beneficial effects of the above technical solutions are as follows: a new gas humidification device with rapid dew point temperature adjustment is proposed, and two tanks are added. Quick adjustment. Then use the temperature control function of the gas humidification tank itself to perform fine adjustment of the error after water injection, and the implementation of the coarse adjustment + fine adjustment scheme ensures the accuracy of temperature control. The device is suitable for all operating points, and can achieve rapid adjustment of gas humidity at any current density and temperature. Compared with adding a more accurate flow control scheme, the cost is significantly lower, and the scope of application is wider. Moreover, there is no change to the gas pipeline of the gas humidification tank, which ensures the consistency of the test in the fast humidification mode and the non-rapid humidification mode.

Based on a further improvement of the above device, the gas humidification device further includes a first solenoid valve and a second solenoid valve; wherein,

The first solenoid valve is arranged on the connecting pipeline between the gas humidification tank and the first water pump, and its control end is connected with the output end of the controller;

The second solenoid valve is arranged on the connecting pipeline between the gas humidification tank and the second water pump, and its control end is also connected to the output end of the controller.

Further, the gas humidification device also includes an electronically controlled three-way valve; wherein,

The input end of the electric control three-way valve is connected with the water outlet of the gas humidification tank, the output end one is connected with the water inlet of the first tank body, the output end two is connected with the water inlet of the second tank body, and the control end is connected with the controller output connection.

Further, the controller is also used to monitor in real time whether the liquid level in the gas humidification tank exceeds the limit during the water injection process, if not, continue monitoring, and if so, drive the gas humidification tank to drain water, and identify the drainage of the gas humidification tank Whether the temperature is close to the water temperature T _A in the first tank or the water temperature T _B in the second tank, and then adjust the opening of the electronically controlled three-way valve to recover the water from the gas humidification tank to the matching first tank or second tank; and, start The temperature adjustment equipment of the first tank body and the second tank body keeps the water temperature in the first tank body and the second tank body at a constant temperature.

Further, the gas humidification device further includes a first heat exchanger and a first electric heater as temperature adjustment equipment for the first tank; wherein,

The first heat exchanger is in communication with the liquid in the first tank and the cathode tail gas of the fuel cell stack, respectively, and its control end is connected with the output end of the controller, and is used for the liquid in the first tank and the cathode after startup. Exhaust gas for heat exchange;

The first tank body is also provided with a first electric heater capable of heating the liquid in the tank, the control end of which is connected to the output end of the controller.

Further, the gas humidification device also includes a second heat exchanger, which is used as a temperature adjustment device for the second tank; wherein,

The second heat exchanger is respectively connected with the liquid in the second tank and the cooling water of the equipment, and its control end is connected with the output end of the controller, and is used for heat exchange between the liquid in the second tank and the cooling water of the equipment after startup.

Further, the gas humidification device also includes a third heat exchanger; the third heat exchanger, together with the heater and the cooling plate in the gas humidification tank, serve as the temperature adjustment equipment of the gas humidification tank; wherein,

The third heat exchanger is respectively connected with the liquid in the gas humidification tank and the equipment cooling water, and its control end is connected with the output end of the controller for heat exchange between the liquid in the gas humidification tank and the equipment cooling water after startup.

Further, the shells of the first tank body, the second tank body and the gas humidification tank are all provided with a heat insulating layer and have a heat insulating structure.

Further, the controller further includes a data acquisition unit, a data processing and a control unit connected in sequence; wherein,

The data collection unit further includes:

The target humidity acquisition subunit is used to receive the target humidity of the test gas;

The liquid level height sensor is installed on the inner wall of the gas humidification tank to obtain the liquid level height in the gas humidification tank;

The liquid temperature sensor is respectively arranged on the inner wall of the gas humidification tank, the first tank body and the second tank, and is used to obtain the actual water temperature in the gas humidification tank, the water temperature in the first tank and the water temperature in the second tank;

The flow sensor is arranged on the inner wall of the output pipe of the water pump, and is used to obtain the water inlet flow corresponding to the current speed of the water pump.

Further, the data processing and control unit executes the following procedures:

S1. Determine the dew point temperature T ₁ corresponding to the target humidity;

S2. Obtain the actual water temperature T ₀ in the gas humidification tank at the current moment through the liquid temperature sensor in the gas humidification tank;

S3. Compare the above-mentioned actual water temperature T ₀ with the dew point temperature T ₁ , if the actual temperature T ₀ is lower than the dew point temperature T ₁ , execute step S4 , and if the actual temperature T ₀ is higher than the dew point temperature T ₁ , execute step S5 ;

S4. Start the first water pump and turn on the first solenoid valve to start the coarse adjustment and temperature rise branch to inject water into the gas humidification tank, until the coarse adjustment is completed, close the first water pump and the first solenoid valve, and perform step S6; During the adjustment process, the opening time t1 of the _first solenoid valve satisfies

t ₁ =[( T ₁ - T ₀ ) L ₂ /( T _A - T ₀ )]/ L ₀

In the formula, L ₂ is the water volume in the gas humidification tank obtained according to the data collected by the liquid level sensor, and the unit is L; L ₀ is the water inlet flow corresponding to the rotation speed of the pump collected by the flow sensor, and the unit is L s ^-1 ; T _A is the water temperature in the first tank, in °C;

S5. Start the second water pump and turn on the second solenoid valve to start the coarse adjustment and cooling branch to inject water into the gas humidification tank, until the coarse adjustment is completed, close the second water pump and the second solenoid valve, and perform step S6; The opening time t2 of the _second solenoid valve satisfies

t ₂ =[( T ₀ - T ₁ ) L ₂ /( T ₀ - T _B )]/ L ₀

In the formula, T _B is the water temperature in the first tank, the unit is °C;

S6. Obtain the actual water temperature in the gas humidification tank again, and compare the actual water temperature with the dew point temperature again. If the actual water temperature is still lower than the dew point temperature, start the heater in the gas humidification tank to further fine-tune the water temperature. If the actual water temperature is higher than the dew point temperature, Start the cooling plate in the gas humidification tank to further fine-tune the water temperature, so that the actual water temperature in the gas humidification tank reaches the dew point temperature corresponding to the target humidity;

S7. Pass the gas to be measured into the gas humidification tank.

Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

1. By recovering the waste heat of the tail exhaust, the temperature of the first tank is maintained, and the energy consumption for heating water is reduced.

2. A temperature sensor is added to the drainage port at the bottom of the gas humidification tank, and a three-way valve is added to the drainage pipeline, which is connected to the first tank body and the second tank body respectively, and the water used in the gas humidification tank is recovered, saving the test. cost.

3. There is no flow range limitation, which can realize rapid humidification under the parameters of the full power section of the fuel cell stack.

This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure.

Description of drawings

The above and other objects, features and advantages of the present disclosure will become more apparent from the more detailed description of the exemplary embodiments of the present disclosure, taken in conjunction with the accompanying drawings, wherein the same reference numerals generally refer to the exemplary embodiments of the present disclosure. same parts.

Figure 1 shows a schematic diagram of the composition of the gas humidification device in Example 1;

FIG. 2 shows a schematic diagram of a connection of the gas humidifying device in Example 2. FIG.

Reference number:

1- Gas humidification tank; 2- The first tank; 3- The second tank; 4- The first water pump; 5- The first battery valve; 6- The second water pump; 7- The second solenoid valve; 8- Electric control Three-way valve; 9- fuel cell stack.

Detailed ways

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As used herein, the term "including" and variations thereof mean open-ended inclusion, ie, "including but not limited to". The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

Example 1

An embodiment of the present invention discloses a gas humidification device for fuel cell testing. As shown in Figure 1, it includes a gas humidification tank and is equipped with constant temperature hot water (the specific temperature can be set according to the test requirements, generally 0~ 30°C), the second tank with constant temperature cold water (the specific temperature can be set according to the test requirements, generally 50~90°C), the first water pump, the second water pump and the controller.

Among them, the gas humidification tank is provided with a heater and a cooling plate for precise temperature adjustment of the liquid in the tank. Once the water inlet is connected to the water outlet of the first tank through the first water pump, a coarse adjustment and heating branch is formed, and its water inlet two The second water pump is connected to the water outlet of the second tank to form a coarse adjustment and cooling branch. The gas inlet of the gas humidification tank is used to introduce the gas to be measured, such as air or hydrogen.

The controller is used to determine the dew point temperature corresponding to the target humidity after startup; and, obtain the actual water temperature in the gas humidification tank at the current moment, and start the coarse adjustment heating branch or the coarse adjustment cooling branch according to the comparison result of the actual water temperature and the dew point temperature. Water is injected into the gas humidification tank; and, after the water injection is completed, the heater or cooling plate in the gas humidification tank is started to further finely adjust the water temperature, so that the actual water temperature in the gas humidification tank reaches the dew point temperature, and then the gas humidification tank is ventilated.

The method of determining the dew point temperature according to the target humidity is the prior art, for example, see patents CN202010632207.6, CN202111321746.9 and the like. Those skilled in the art can understand.

During implementation, when the actual water temperature is lower than the dew point temperature, it is necessary to heat the water temperature, start the coarse adjustment heating branch to inject hot water into the gas humidification tank to perform a rough adjustment of the water temperature, and then start the heater in the gas humidification tank or the cooling plate to further. Fine-tune the water temperature. When the actual water temperature is higher than the dew point temperature, it is necessary to cool down the water temperature, start the coarse adjustment and cooling branch to inject cold water into the gas humidification tank to make a rough adjustment of the water temperature, and then start the heater or cooling plate in the gas humidification tank to further adjust the water temperature. .

Compared with the prior art, the present embodiment proposes a new gas humidification device with rapid dew point temperature adjustment, adding two tanks, and through the injection of cold water and hot water, the rapid initial adjustment of the water temperature is realized, and then the Quick regulation of humidity. Then use the temperature control function of the gas humidification tank itself to perform fine adjustment of the error after water injection, and the implementation of the coarse adjustment + fine adjustment scheme ensures the accuracy of temperature control. The device is suitable for all operating points, and can achieve rapid adjustment of gas humidity at any current density and temperature. Compared with adding a more accurate flow control scheme, the cost is significantly lower, and the scope of application is wider. Moreover, there is no change to the gas pipeline of the gas humidification tank, which ensures the consistency of the test in the fast humidification mode and the non-rapid humidification mode.

Example 2

Improvements are made on the basis of Example 1, and all pipe joints are provided with seals to prevent leakage of gas and liquid.

Preferably, the second heat exchanger is a plate heat exchanger. The heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and lightweight structure, small footprint, convenient installation and cleaning, wide application and long service life. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger, the floor area is one third of that of the tubular heat exchanger, and the heat recovery rate can be as high as 90% or more.

Preferably, the gas humidification device further includes a first solenoid valve and a second solenoid valve. Wherein, the first solenoid valve is arranged on the connecting pipeline between the gas humidification tank and the first water pump, and its control end is connected with the output end of the controller; the second solenoid valve is arranged on the gas humidification tank and the second water pump The control end is also connected to the output end of the controller on the connecting pipeline between them.

Preferably, the gas humidification device further includes an electronically controlled three-way valve. Wherein, the input end of the electronically controlled three-way valve is connected with the water outlet of the gas humidification tank, the output end 1 is connected with the water inlet of the first tank body, the output end 2 is connected with the water inlet of the second tank body, and the control end is connected with the water inlet of the second tank body. The output of the controller is connected.

Preferably, the controller is also used to monitor in real time whether the liquid level in the gas humidification tank exceeds the limit during the water injection process, if not, continue to monitor, if so, drive the gas humidification tank to drain, and identify that the temperature of the gas humidification tank is close to The water temperature T _A in the first tank is still the water temperature T _B in the second tank, and then the opening of the electronically controlled three-way valve is adjusted to recover the water from the gas humidification tank to the matching first tank or second tank; and, start the first tank The temperature adjustment equipment of the tank body and the second tank body keeps the water temperature in the first tank body and the second tank body at a constant temperature.

Preferably, the gas humidification device further includes a first heat exchanger and a first electric heater as temperature adjustment equipment for the first tank.

Wherein, the first heat exchanger is connected with the liquid in the first tank and the cathode tail gas of the fuel cell stack, respectively, and its control end is connected with the output end of the controller, which is used for the liquid in the first tank and the cathode after startup. The exhaust gas exchanges heat.

The first tank body is also provided with a first electric heater capable of heating the liquid in the tank, and the control end of the heater is connected with the output end of the controller.

Preferably, the gas humidification device further includes a second heat exchanger, which is used as a temperature adjustment device for the second tank.

Wherein, the second heat exchanger is respectively connected with the liquid in the second tank and the cooling water of the equipment, and its control end is connected with the output end of the controller for heat exchange between the liquid in the second tank and the cooling water of the equipment after startup.

Preferably, the gas humidification device further includes a third heat exchanger. The third heat exchanger, together with the heater and the cooling plate in the gas humidification tank, serves as a temperature adjustment device for the gas humidification tank.

Wherein, the third heat exchanger is connected with the liquid in the gas humidification tank and the equipment cooling water respectively, and its control end is connected with the output end of the controller for heat exchange between the liquid in the gas humidification tank and the equipment cooling water after startup.

Preferably, the shells of the first tank body, the second tank body, and the gas humidification tank are all provided with a thermal insulation layer and have a thermal insulation structure.

Preferably, the controller further comprises a data acquisition unit, a data processing and control unit connected in sequence.

Wherein, the data acquisition unit further includes a target humidity acquisition sub-unit, a liquid level sensor, a liquid temperature sensor, and a flow sensor.

The target humidity acquisition subunit is used to receive the target humidity of the test gas.

The liquid level height sensor is arranged on the inner wall of the gas humidification tank and is used to obtain the liquid level height in the gas humidification tank.

The liquid temperature sensors are respectively arranged on the inner wall of the gas humidification tank, the first tank body and the second tank, and are used to obtain the actual water temperature in the gas humidification tank, the water temperature in the first tank and the water temperature in the second tank.

The flow sensor is arranged on the inner wall of the output pipe of the water pump, and is used to obtain the water inlet flow corresponding to the current speed of the water pump.

Preferably, the data processing and control unit executes the following procedures:

S1. Determine the dew point temperature T ₁ corresponding to the target humidity;

S2. Obtain the actual water temperature T ₀ in the gas humidification tank at the current moment through the liquid temperature sensor in the gas humidification tank;

S3. Compare the above-mentioned actual water temperature T ₀ with the dew point temperature T ₁ , if the actual temperature T ₀ is lower than the dew point temperature T ₁ , execute step S4 , and if the actual temperature T ₀ is higher than the dew point temperature T ₁ , execute step S5 ;

S4. Start the first water pump and turn on the first solenoid valve to start the coarse adjustment and temperature rise branch to inject water into the gas humidification tank, until the coarse adjustment is completed, close the first water pump and the first solenoid valve, and perform step S6; During the adjustment process, the opening time t1 of the _first solenoid valve satisfies

t ₁ =[( T ₁ - T ₀ ) L ₂ /( T _A - T ₀ )]/ L ₀

In the formula, L ₂ is the water volume in the gas humidification tank obtained according to the data collected by the liquid level sensor, and the unit is L; L ₀ is the water inlet flow corresponding to the rotation speed of the pump collected by the flow sensor, and the unit is L s ^-1 ; T _A is the water temperature in the first tank, in °C;

S5. Start the second water pump and turn on the second solenoid valve to start the coarse adjustment and cooling branch to inject water into the gas humidification tank, until the coarse adjustment is completed, close the second water pump and the second solenoid valve, and perform step S6; The opening time t2 of the _second solenoid valve satisfies

t ₂ =[( T ₀ - T ₁ ) L ₂ /( T ₀ - T _B )]/ L ₀

In the formula, T _B is the water temperature in the first tank, the unit is °C;

S6. Obtain the actual water temperature in the gas humidification tank again, and compare the actual water temperature with the dew point temperature again. If the actual water temperature is still lower than the dew point temperature, start the heater in the gas humidification tank to further fine-tune the water temperature. If the actual water temperature is higher than the dew point temperature, Start the cooling plate in the gas humidification tank to further fine-tune the water temperature, so that the actual water temperature in the gas humidification tank reaches the dew point temperature corresponding to the target humidity;

S7. Pass the gas to be measured into the gas humidification tank.

During implementation, the first tank is equipped with a heater, and the water temperature is maintained at 70°C through heat exchange with the cathode tail row. The temperature can be set and changed according to user needs. In this scheme, 70°C is taken as an example. The second tank exchanges heat with the cooling water of the equipment through plate exchange, and maintains the water temperature at 20°C.

The first tank body and the second tank body are respectively connected with the gas humidification tank.

A temperature sensor is added to the water outlet at the bottom of the gas humidification tank, and a three-way valve is added to the drain pipeline, which is respectively connected with the first tank body and the second tank body.

The control method is as follows: start the corresponding solenoid valve and the water pump with a constant speed, and inject water into the gas humidification tank for rough adjustment of the water temperature. To achieve rapid control of water temperature increase or decrease. Since the water injection process may cause the liquid level in the gas humidification tank to exceed the limit, the gas humidification tank will automatically drain, resulting in the fact that the actual water input cannot adjust the water temperature in the gas humidification tank to the target temperature value, so it is necessary to adjust the temperature of the gas humidification tank. The equipment further controls the temperature after water injection, so that the water temperature can quickly reach the target value. The water discharged from the gas humidification tank, according to the drainage temperature, if the drainage temperature is closer to 70 ℃, the discharged water will be collected to the first tank through the control of the three-way valve; if the water temperature is closer to 20 ℃, the discharged water will be collected to second tank. After collecting the discharged water, the first tank body and the second tank body maintain the water temperature and prepare for the next temperature adjustment.

Compared with Embodiment 1, the gas humidifying device provided in this embodiment has the following beneficial effects:

1. By recovering the waste heat of the tail exhaust, the temperature of the first tank is maintained, and the energy consumption for heating water is reduced.

2. A temperature sensor is added to the drainage port at the bottom of the gas humidification tank, and a three-way valve is added to the drainage pipeline, which is connected to the first tank body and the second tank body respectively, and the water used in the gas humidification tank is recovered, saving the test. cost.

3. There is no flow range limitation, which can realize rapid humidification under the parameters of the full power section of the fuel cell stack.

Various embodiments of the present disclosure have been described above, and the foregoing descriptions are exemplary, not exhaustive, and not limiting of the disclosed embodiments. Numerous modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen to best explain the principles of the various embodiments, the practical application or improvement over the prior art, or to enable others of ordinary skill in the art to understand the various embodiments disclosed herein.

Claims (10)

1. A gas humidifying device for testing a fuel cell is characterized by comprising a gas humidifying tank, a first tank body filled with constant-temperature hot water, a second tank body filled with constant-temperature cold water, a first water pump, a second water pump and a controller; wherein,

a heater and a cooling plate for accurately adjusting the temperature of liquid in the gas humidifying tank are arranged in the gas humidifying tank, a water inlet of the gas humidifying tank is connected with a water outlet of the first tank through a first water pump to form a rough adjusting temperature-increasing branch, and a water inlet of the gas humidifying tank is connected with a water outlet of the second tank through a second water pump to form a rough adjusting cooling branch;

the controller is used for determining the dew point temperature corresponding to the target humidity after starting; acquiring the actual water temperature in the gas humidification tank at the current moment, and starting the coarse-adjustment temperature rising branch or the coarse-adjustment temperature lowering branch to inject water into the gas humidification tank according to the comparison result of the actual water temperature and the dew point temperature; and after the water injection is finished, starting the heater or the cooling plate in the gas humidification tank to further finely adjust the water temperature, so that the actual water temperature in the gas humidification tank reaches the dew point temperature, and then ventilating the gas humidification tank.

2. The gas humidification device for fuel cell testing of claim 1, further comprising a first solenoid valve, a second solenoid valve; wherein,

the first electromagnetic valve is arranged on a connecting pipeline between the gas humidification tank and the first water pump, and the control end of the first electromagnetic valve is connected with the output end of the controller;

the second electromagnetic valve is arranged on a connecting pipeline between the gas humidifying tank and the second water pump, and the control end of the second electromagnetic valve is also connected with the output end of the controller.

3. The gas humidification device for fuel cell testing of claim 1 or 2, further comprising an electrically controlled three-way valve; wherein,

the input end of the electric control three-way valve is connected with a water outlet of the gas humidifying tank, the first output end of the electric control three-way valve is connected with a water inlet of the first tank body, the second output end of the electric control three-way valve is connected with a water inlet of the second tank body, and the control end of the electric control three-way valve is connected with the output end of the controller.

4. The humidification apparatus for testing a fuel cell of claim 3, wherein the controller is further configured to monitor in real time during the water injection whether the liquid level in the humidification tank exceeds a limit, and if not, to continue monitoring, and if so, to drive the humidification tank to drain water, and to identify that the temperature of the water drained from the humidification tank is close to the temperature of the water in the first tankT _A Or the water temperature in the second tank bodyT _B Further adjusting the opening of the electric control three-way valve to recycle the water drained from the gas humidification tank to the matched first tank body or second tank body; and starting the temperature adjusting devices of the first tank body and the second tank body to keep the water temperature in the first tank body and the water temperature in the second tank body constant.

5. The gas humidification device for fuel cell testing of claim 4, further comprising a first heat exchanger, a first electric heater as a temperature regulation device of the first tank; wherein,

the first heat exchanger is respectively communicated with the liquid in the first tank body and the cathode tail exhaust body of the fuel cell stack, and the control end of the first heat exchanger is connected with the output end of the controller and is used for carrying out heat exchange on the liquid in the first tank body and the cathode tail exhaust body after starting;

the first tank body is also internally provided with a first electric heater which can heat the liquid in the tank, and the control end of the first electric heater is connected with the output end of the controller.

6. The gas humidification apparatus for a fuel cell test as claimed in claim 4 or 5, further comprising a second heat exchanger as a temperature adjustment device of the second tank; wherein,

the second heat exchanger is respectively communicated with the liquid in the second tank body and the equipment cooling water, and the control end of the second heat exchanger is connected with the output end of the controller and used for carrying out heat exchange on the liquid in the second tank body and the equipment cooling water after starting.

7. The gas humidification device for fuel cell testing of any one of claims 1, 2, 4 and 5, further comprising a third heat exchanger; the third heat exchanger, a heater and a cooling plate in the gas humidifying tank are used as temperature adjusting equipment of the gas humidifying tank; wherein,

the third heat exchanger is respectively communicated with the liquid in the gas humidifying tank and the equipment cooling water, and the control end of the third heat exchanger is connected with the output end of the controller and used for carrying out heat exchange on the liquid in the gas humidifying tank and the equipment cooling water after starting.

8. The gas humidification device for fuel cell testing of claim 7, wherein the first tank, the second tank and the housing of the gas humidification tank are all provided with thermal insulation layers and have thermal insulation structures.

9. The gas humidifying device for the fuel cell test according to any one of claims 1, 2, 4, 5 and 8, wherein the controller further comprises a data acquisition unit, a data processing and control unit which are connected in sequence; wherein,

the data acquisition unit further comprises:

a target humidity acquiring subunit, configured to receive a target humidity of the test gas;

the liquid level height sensor is arranged on the inner wall of the gas humidifying tank and used for acquiring the liquid level height in the gas humidifying tank;

the liquid temperature sensors are respectively arranged on the inner walls of the gas humidifying tank, the first tank body and the second tank body and are used for acquiring the actual water temperature in the gas humidifying tank, the water temperature in the first tank body and the water temperature in the second tank body;

and the flow sensor is arranged on the inner wall of the pipeline at the output end of the water pump and used for acquiring the water inlet flow corresponding to the current rotating speed of the water pump.

10. The gas humidification device for fuel cell test as set forth in claim 9, wherein the data processing and control unit executes the following program:

s1, determining a dew point temperature corresponding to a target humidityT ₁ ；

S2, acquiring the actual water temperature in the gas humidification tank at the current moment through a liquid temperature sensor in the gas humidification tankT ₀ ；

S3, mixing the actual water temperatureT ₀ And dew point temperatureT ₁ Comparing, if the actual temperature isT ₀ Below dew point temperatureT ₁ Step S4 is executed if the actual temperature is not equal to the predetermined temperatureT ₀ Above dew point temperatureT ₁ Step S5 is executed;

s4, starting a first water pump and starting a first electromagnetic valve to start a rough-adjusting temperature-rising branch to inject water into the gas humidification tank until rough adjustment is completed, closing the first water pump and the first electromagnetic valve, and executing the step S6; wherein, the opening time of the first electromagnetic valve in the course of coarse adjustmentt ₁ Satisfy the requirement of

t ₁ =[(T ₁ -T ₀ ）L ₂ /(T _A -T ₀ )]/L ₀

In the formula,L ₂ the unit of the water quantity in the gas humidifying tank is L, which is obtained according to data acquired by the liquid level height sensor;L ₀ the unit of the inflow water flow corresponding to the rotating speed of the water pump collected by the flow sensor is L.s ^-1 ；T _A The water temperature in the first tank body is measured in units of temperature;

s5, starting a second water pump and opening a second electromagnetic valve to start a coarse-tuning cooling branch to inject water into the gas humidification tank until coarse tuning is completed, closing the second water pump and the second electromagnetic valve, and executing the step S6; wherein the opening time of the second electromagnetic valvet ₂ Satisfy the requirement of

t ₂ =[(T ₀ -T ₁ ）L ₂ /(T ₀ -T _B )]/L ₀

In the formula,T _B the water temperature in the first tank body is measured in units of temperature;

s6, obtaining the actual water temperature in the gas humidifying tank again, comparing the actual water temperature with the dew point temperature again, starting a heater in the gas humidifying tank to further finely adjust the water temperature if the actual water temperature is still lower than the dew point temperature, and starting a cooling plate in the gas humidifying tank to further finely adjust the water temperature if the actual water temperature is higher than the dew point temperature, so that the actual water temperature in the gas humidifying tank reaches the dew point temperature corresponding to the target humidity;

s7, introducing the gas to be detected into the gas humidifying tank.

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