A method and system for temperature and humidity control of a fuel cell system

Abstract

The application discloses a temperature and humidity regulation method and system of a fuel cell system, and the temperature and humidity regulation method comprises the following steps: obtaining a target adjustment temperature T m and a target adjustment humidity H m of current fuel cell stack air; obtaining a real-time temperature T C and a real-time humidity H u of air of a fuel cell air inlet temperature and humidity regulation device; adjusting the water temperature of the fuel cell air inlet temperature and humidity regulation device and / or adjusting the air inlet proportion of different air humidity increasing areas of the fuel cell air inlet temperature and humidity regulation device, so that a first temperature difference |T X | is less than or equal to 5 DEG C, and a first humidity difference |H X | is less than or equal to 20%. The application further discloses a temperature and humidity regulation system of a fuel cell system, which can actively adjust the temperature and humidity of stack air to meet the requirements of fuel cells in different working conditions.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and more specifically, to a method and system for temperature and humidity control in a fuel cell system. Background Technology

[0002] Fuel cell engines or power generation devices typically employ intercoolers and humidifiers to cool and humidify the incoming air, ensuring that the temperature and humidity parameters of the air entering the fuel cell meet requirements. Fuel cell engines or power generation devices generally receive a certain amount of air from an air compressor; under a given pressure, the higher the compressor's outlet flow rate, the higher the temperature. Intercoolers and humidifiers are commonly used in fuel cell engines or power generation devices to regulate air temperature and humidity; the air flow rate entering the fuel cell varies depending on the current applied.

[0003] Currently, intercoolers and humidifiers used in this scenario generally cannot actively regulate temperature and humidity, which means that the temperature and humidity of the air entering the fuel cell cannot meet the fuel cell's requirements under any operating conditions. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method and system for temperature and humidity control of a fuel cell system, so as to solve the technical problem that the intercooler and humidifier in the prior art cannot actively regulate the temperature and humidity of the air entering the fuel cell.

[0005] To address the above problems, the first objective of this invention is to provide a method for temperature and humidity control in a fuel cell system, the method comprising:

[0006] S 100 : Obtain the target set temperature T of the current fuel cell inlet air. m Adjust humidity H to target m ;

[0007] S 200 : Obtain the real-time temperature T of the air entering the fuel cell air temperature and humidity control device. C and real-time humidity H u ;

[0008] S 300 Adjusting the water temperature and / or adjusting the intake ratio of the intake areas with different humidity levels in the fuel cell inlet temperature and humidity regulating device to achieve a first temperature difference T X ≤5℃, first humidity difference H X ≤20%; of which, T X =T m -T C Hx =H m -H u .

[0009] Furthermore, it also includes:

[0010] S 400 : Obtain the first real-time intake temperature T of the air entering the fuel cell intake air and humidity regulating device. I And calculate the second temperature difference T. Q =T m -T I ;

[0011] S 500 Determine the second temperature difference T Q The size of the device is adjusted, and the water temperature inside the fuel cell inlet air and humidity regulating device is adjusted so that the outlet air temperature of the fuel cell inlet air and humidity regulating device is close to the target adjustment temperature T. m .

[0012] Furthermore, in step S 300 Specifically, adjusting the water temperature of the fuel cell inlet temperature and humidity regulating device includes adjusting the opening degree of the inlet flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device.

[0013] Optionally, in step S 300 Specifically, adjusting the water temperature of the fuel cell inlet temperature and humidity regulating device includes turning the heater on or off to adjust the water temperature of the fuel cell inlet temperature and humidity regulating device.

[0014] Optionally, in step S 300 Specifically, adjusting the water temperature of the fuel cell inlet temperature and humidity regulating device includes turning the heat exchanger on or off to adjust the water temperature of the fuel cell inlet temperature and humidity regulating device.

[0015] Furthermore, in step S 300 Specifically, adjusting the intake ratio of the intake areas with different humidity levels in the intake air of the fuel cell intake temperature and humidity regulating device includes: adjusting the opening degree of the intake flow regulating valve at the air inlet of different intake areas.

[0016] Furthermore, in step S 500 Among them, the determination of the second temperature difference T Q The specific steps for adjusting the size and water temperature in the fuel cell inlet temperature and humidity regulating device include:

[0017] S 510 If T QIf the value is greater than 0, then the opening of the water flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device is increased to increase the water flow from the fuel cell to the fuel cell inlet temperature and humidity regulating device, thereby raising the temperature of the water in the fuel cell inlet temperature and humidity regulating device.

[0018] S 520 If T Q If the value is less than 0, then the opening of the water flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device is reduced to decrease the water flow from the fuel cell to the fuel cell inlet temperature and humidity regulating device, thereby cooling the water in the fuel cell inlet temperature and humidity regulating device.

[0019] S 530 Adjust the opening of the water flow regulating valve at the outlet of the fuel cell inlet temperature and humidity regulating device to adjust the liquid level value in the fuel cell inlet temperature and humidity regulating device, so that the liquid level error between the liquid level value and the target liquid level is within the set range.

[0020] Further, step S 300 The specific steps include:

[0021] When the first temperature difference T X When the temperature is ≥2℃, follow these steps:

[0022] The water in the fuel cell inlet temperature and humidity control device is heated to increase the outlet temperature of the air exiting the fuel cell inlet temperature and humidity control device.

[0023] When the first temperature difference T X When the temperature is ≤-2℃, follow these steps:

[0024] The water in the fuel cell inlet temperature and humidity control device is cooled down to reduce the outlet temperature of the air exiting the fuel cell inlet temperature and humidity control device.

[0025] When the first humidity difference H X When ≥5%, perform the following steps:

[0026] Adjust the air intake ratio between the air intake area with high humidity and the air intake area with low humidity, so that the air intake proportion of the air intake area with high humidity increases, while the air intake proportion of the air intake area with low humidity decreases.

[0027] When the first humidity difference H X When ≤-5%, perform the following steps:

[0028] The air intake ratio of the air intake area with high humidity and the air intake area with low humidity is adjusted so that the air intake proportion of the air intake area with high humidity is reduced, while the air intake proportion of the air intake area with low humidity is increased.

[0029] A second objective of this invention is to provide a temperature and humidity control system for a fuel cell system, comprising: a fuel cell, an air system, and a controller for executing the temperature and humidity control method for the fuel cell system described above; wherein, the air system includes an air compressor and a fuel cell inlet temperature and humidity regulating device; the fuel cell inlet temperature and humidity regulating device includes: a housing for storing liquid and at least two air inlet pipes; the outlet end of each air inlet pipe extends into the housing, and the distance between the outlet end of at least two air inlet pipes and the liquid surface is different; each air inlet pipe is provided with an air flow regulating valve at its inlet end; the housing is provided with an air outlet, a water inlet, and a water outlet; the air outlet is higher than the liquid surface, and the water outlet is lower than the liquid surface;

[0030] The exhaust port of the air compressor is connected to the intake pipe, and the exhaust port is connected to the air inlet of the fuel cell through the exhaust pipe; the drain pipe of the fuel cell is connected to the water inlet; the exhaust pipe is equipped with an exhaust gas temperature sensor and an exhaust gas humidity sensor.

[0031] Furthermore, an air flow meter is installed on the air outlet pipe.

[0032] Furthermore, an inlet pipe is connected to the inlet, and the inlet pipe is equipped with an inlet water temperature sensor and / or an inlet water flow regulating valve.

[0033] Furthermore, the water inlet pipe is equipped with a water flow meter.

[0034] Furthermore, the container is equipped with an internal water temperature sensor.

[0035] Furthermore, a water outlet pipe is connected to the water outlet, and the water outlet pipe is equipped with a water flow regulating valve and / or a water flow meter.

[0036] Furthermore, the outlet end of each of the air inlets is composed of multiple independent sub-outlets, and each sub-outlet is connected to the air inlet end of the air inlet.

[0037] Furthermore, the outlet is connected to the inlet of the drainage pipe.

[0038] Furthermore, the outlet of the fuel cell inlet temperature and humidity regulating device is connected to the external environment.

[0039] Furthermore, the controller includes:

[0040] The acquisition unit is used to acquire the target set temperature T of the current fuel cell inlet air. m Adjust humidity H to target m It is also used to obtain the real-time temperature T of the air inlet temperature and humidity regulating device of the fuel cell.C and real-time humidity H u ;

[0041] A calculation unit is used to adjust the temperature T according to the target. m Adjust the humidity H to the target m The real-time temperature T of the air entering and exiting the fuel cell inlet temperature and humidity control device C and real-time humidity H u Determine the first temperature difference T X and the first humidity difference H x , among which, T X =T m -T C H x =H m -H u ;

[0042] The regulating unit is used to adjust the water temperature of the fuel cell inlet temperature and humidity regulating device and / or adjust the intake ratio of the intake areas of the fuel cell inlet temperature and humidity regulating device that have different humidity levels, so as to make the first temperature difference T X ≤5℃, first humidity difference H X ≤20%.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] 1. The temperature and humidity control method for a fuel cell system described in this application obtains the target adjustment temperature and target adjustment humidity of the air entering the fuel cell stack, and then obtains the real-time temperature and real-time humidity of the air in the fuel cell inlet temperature and humidity control device. It calculates a first temperature difference and a first humidity difference to actively adjust the water temperature of the fuel cell inlet temperature and humidity control device and adjust the intake ratio of different intake areas of the fuel cell inlet temperature and humidity control device to achieve different humidity levels for the air flowing through it. The liquid in the fuel cell inlet temperature and humidity control device humidifies the air entering through the intake pipe. By adjusting the intake flow rate into different intake pipes, the degree of humidification of the gas is adjusted, thereby achieving the purpose of adjusting the outlet air humidity. Simultaneously, this control method can actively regulate the temperature and humidity of the gas entering the fuel cell to meet the temperature and humidity requirements of the fuel cell under different operating conditions. It can be widely used in energy storage power stations, fuel cell vehicles, and other industrial humidification industries.

[0045] 2. In this invention, the air outlet end of the air inlet pipe is provided with multiple sub-air outlets, which makes the air outlet more dispersed, increases the contact area between the gas and the liquid, and makes the humidification and heat exchange effect more excellent.

[0046] 3. The housing of this invention has a built-in heater and / or heat exchanger, which enables the fuel cell inlet temperature and humidity regulation device to heat the water in low-temperature environments (such as -30℃ and below), thereby raising the temperature of the air flowing through the water to meet the inlet temperature requirements of the fuel cell, protect the fuel cell, and extend its service life.

[0047] 4. The controller used in this invention to implement the temperature and humidity control method of the fuel cell system has an acquisition, calculation and adjustment unit, which can actively adjust the temperature and humidity of the air entering the fuel cell to meet the temperature and humidity requirements of the fuel cell for the air entering the stack under different operating conditions. Attached Figure Description

[0048] Figure 1 This is a schematic flowchart of the temperature and humidity control method for a fuel cell system in an embodiment of the present invention;

[0049] Figure 2 Step S in the temperature and humidity control method of the fuel cell system in this embodiment of the invention 400 -S 500 A flowchart;

[0050] Figure 3 Step S in the temperature and humidity control method of the fuel cell system in this embodiment of the invention 500 A detailed flowchart;

[0051] Figure 4 This is a schematic diagram of the temperature and humidity control system of the fuel cell system in an embodiment of the present invention;

[0052] Figure 5 This is a schematic diagram of the process structure of the fuel cell inlet temperature and humidity regulating device in an embodiment of the present invention;

[0053] Figure 6 This is a three-dimensional structural schematic diagram of the fuel cell inlet temperature and humidity regulating device in an embodiment of the present invention;

[0054] Figure 7 This is a schematic front view of the fuel cell inlet temperature and humidity regulating device in an embodiment of the present invention;

[0055] Figure 8 This is a schematic diagram of the controller in an embodiment of the present invention.

[0056] Explanation of reference numerals in the attached figures:

[0057] 1-Box body; 2-First air inlet pipe; 3-Second air inlet pipe; 4-Third air inlet pipe; 5-First air inlet flow regulating valve; 6-Second air inlet flow regulating valve; 7-Third air inlet flow regulating valve; 8-Air outlet pipe; 9-Temperature and humidity sensor; 10-Air flow meter; 11-Water inlet pipe; 12-Water inlet temperature sensor; 13-Water inlet flow regulating valve; 14-Water inlet flow meter; 15-Water outlet pipe; 16-Water outlet flow regulating valve; 17-Water outlet flow meter; 18-Water temperature sensor inside the box; 19-Air inlet manifold; 100-Liquid level line; 101-Air outlet; 102-Water inlet; 103-Water outlet;

[0058] C-1, Air filter; C-2, Flow and temperature sensors; C-3, Air compressor; C-4, First temperature sensor; C-5, Fuel cell inlet air and humidity control device; C-6, Bypass valve; C-7, Pressure sensor; C-8, Air intake throttle valve; C-9, Air back pressure valve; C-10, Water reservoir; C-11, Air exhaust pipe; W-1, Water pump; W-2, Second temperature sensor; A-1, Fuel cell. Detailed Implementation

[0059] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] In the description of this invention, it should be noted that the terms "first," "second," "third," etc., are used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0063] Please see Figure 1 As shown, this embodiment of the invention provides a method for temperature and humidity control in a fuel cell system, the method comprising:

[0064] S 100 : Obtain the target set temperature T of the current fuel cell inlet air. m Adjust humidity H to target m ;

[0065] S 200 : Obtain the real-time temperature T of the air entering the fuel cell air temperature and humidity control device. C and real-time humidity H u ;

[0066] It is worth noting that the fuel cell inlet temperature and humidity control device in this embodiment is used in the fuel cell system, where the gas entering the stack is air or hydrogen. Generally, it is mainly used for temperature and humidity control of air. Hydrogen needs to be treated only in special cases. Of course, based on, but not limited to, the temperature and humidity control method can also be widely used in energy storage power stations, industries, and other humidification industries.

[0067] S 300 Adjusting the water temperature and / or adjusting the intake ratio of different intake zones of the fuel cell inlet temperature and humidity control device to achieve a first temperature difference T X ≤5℃, first humidity difference H X ≤20%; of which, T X =T m -T C H x =H m -H u .

[0068] In this embodiment, an air outlet is provided on one side of the fuel cell inlet air temperature and humidity regulating device. By installing a temperature sensor on the air outlet, the real-time temperature of the inlet air after being regulated by the fuel cell inlet air temperature and humidity regulating device and then output through the air outlet can be detected and compared with the target regulated temperature T of the inlet air. m By comparing and calculating, the first temperature difference T can be determined. X .

[0069] After calculating the first temperature difference T X Subsequently, in order to adjust the real-time temperature T of the air entering the fuel cell air temperature and humidity control device... c To meet the usage requirements of fuel cells, since the fuel cell inlet temperature and humidity control device contains circulating water, adjusting the water flow rate into the fuel cell inlet temperature and humidity control device can maintain the first temperature difference T. X ≤5

[0070] A humidity sensor is also installed at the outlet of the fuel cell inlet temperature and humidity control device, which can detect the real-time humidity H of the air entering the stack after being humidified by the fuel cell inlet temperature and humidity control device and then output through the outlet. u And adjust the humidity H according to the target of the incoming air. m By comparing and calculating, the first humidity difference H can be calculated. x .

[0071] The intake ratio (i.e., intake proportion) of different intake zones with varying humidity levels is controlled to achieve the first humidity difference H. X ≤20%.

[0072] After calculating the first humidity difference H x Subsequently, in order to adjust the real-time humidity H of the air inlet temperature and humidity control device for the fuel cell, u To meet the usage requirements of fuel cells, since the air inlets of the different air humidity zones in the fuel cell inlet temperature and humidity control device are each equipped with an air flow regulating valve, the proportion of airflow entering the fuel cell inlet temperature and humidity control device can be controlled by adjusting the opening of each flow regulating valve, thus allowing the first humidity difference H to be adjusted. X ≤20%.

[0073] In practical applications, adjusting the water temperature of the fuel cell inlet temperature and humidity control device, and adjusting the intake ratio of different intake areas to increase the humidity of the air flowing through it, both affect the temperature and humidity of the air entering the stack. Therefore, one or both of the above two steps can be performed, with the specific result satisfying the first temperature difference T. X ≤5℃, first humidity difference H X ≤20% is acceptable.

[0074] In some embodiments of the present invention, please refer to, for example Figure 2 As shown, the temperature and humidity control method further includes:

[0075] S 400 : Obtain the first real-time intake temperature T of the air entering the fuel cell intake air and humidity control device I And calculate the second temperature difference T. Q =T m -T I ;

[0076] S 500 Determine the second temperature difference T Q The size of the device is adjusted, and the water temperature inside the fuel cell inlet air and humidity regulating device is adjusted so that the outlet air temperature of the fuel cell inlet air and humidity regulating device is close to the target adjustment temperature T. m .

[0077] In this embodiment, an air inlet is also provided on one side of the fuel cell inlet air temperature and humidity regulating device. By installing an inlet air temperature sensor at the air inlet, the first real-time inlet air temperature T of the air entering the fuel cell inlet air temperature and humidity regulating device can be detected in real time. I And the target adjustment temperature T of the fuel cell inlet air. m By comparing and calculating, the second temperature difference T can be determined. Q .

[0078] Through the second temperature difference T Q Adjusting the water temperature within the fuel cell inlet temperature and humidity control device allows for adjustment of the temperature of the incoming air, thereby narrowing the gap between the air outlet temperature of the fuel cell inlet temperature and humidity control device and the target adjustment temperature T. m The difference between them allows for initial and coarse temperature adjustments of the incoming air, followed by adjustments based on the first humidity difference H. x Secondary adjustments and fine-tuning are performed to shorten the adjustment time and improve the timeliness and efficiency of temperature control, in particular. After the initial temperature and humidity adjustment of the air entering the fuel cell inlet air temperature and humidity control device, the opening of the air inlet flow control valve and the water inlet flow control valve can be set, and these adjustments can be used as a reference to facilitate subsequent adjustments.

[0079] Specifically, in the embodiments of the present invention, step S 300 Specifically, adjusting the water temperature of the fuel cell inlet temperature and humidity regulating device includes adjusting the opening of the inlet flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device. In this embodiment, the water in the fuel cell inlet temperature and humidity regulating device can come from the water generated by the fuel cell or the water in its coolant, or it can be a separately installed water supply system.

[0080] In some other embodiments, the water temperature of the fuel cell inlet temperature and humidity control device can also be adjusted by turning the heater on or off. In this embodiment, the heater ensures that the application can operate effectively in a low-temperature environment, and the heater can solve problems such as insufficient water temperature and thawing.

[0081] In other embodiments, the water temperature of the fuel cell inlet temperature and humidity regulating device can also be adjusted by turning the heat exchanger on or off. In this embodiment, the water temperature of the fuel cell inlet temperature and humidity regulating device is regulated through a heat exchanger, which can be used for energy recovery or reuse with other components (such as fuel cells, motors, air conditioning systems, etc.) that utilize the technology of this disclosure. Of course, the heat exchanger can also be a separately installed heat exchange system.

[0082] In order to control the airflow into the fuel cell inlet temperature and humidity control device, an inlet airflow regulating valve is installed at the air inlet of the fuel cell inlet temperature and humidity control device. By adjusting the opening of the inlet airflow regulating valve, the airflow can be controlled.

[0083] Specifically, in the embodiments of the present invention, in step S 300 Specifically, adjusting the intake ratio of different intake areas to increase the humidity of the air flowing through the fuel cell intake temperature and humidity control device includes: adjusting the opening degree of the intake flow regulating valve at the air inlet of different intake areas.

[0084] To detect the water flow rate entering the fuel cell inlet temperature and humidity control device, an inlet flow rate regulating valve is installed at the inlet. By adjusting the opening of the inlet flow rate regulating valve, the water flow rate can be controlled to regulate the temperature, thereby ensuring the first temperature difference T is maintained. X ≤5℃. Adjust the opening of the intake flow regulating valve on the inlet of the fuel cell intake temperature and humidity regulating device to separately adjust the intake areas with different air humidity levels, so that the amount of air flowing to the intake areas with different air humidity levels is different, thereby ensuring the first humidity difference H. X ≤20%, thereby ensuring that the temperature and humidity of the incoming air meet the current operating conditions of the fuel cell, ensuring the operating performance of the fuel cell and improving product quality.

[0085] Please see Figure 3 As shown, in another embodiment of the present invention, based on, but not limited to, the above embodiments, in step S 500 Among them, the determination of the second temperature difference T Q The specific steps for adjusting the size and water temperature in the fuel cell inlet temperature and humidity regulating device include:

[0086] S 510 If T Q If the value is greater than 0, then the opening of the water flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device is increased to increase the water flow from the fuel cell to the fuel cell inlet temperature and humidity regulating device, thereby raising the temperature of the water in the fuel cell inlet temperature and humidity regulating device.

[0087] S 520 If T Q If the value is less than 0, then the opening of the water flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device is reduced to decrease the water flow from the fuel cell to the fuel cell inlet temperature and humidity regulating device, thereby cooling the water in the fuel cell inlet temperature and humidity regulating device.

[0088] S 530Adjust the opening of the water flow regulating valve at the outlet of the fuel cell inlet temperature and humidity regulating device to adjust the liquid level value in the fuel cell inlet temperature and humidity regulating device, so that the liquid level error between the liquid level value and the target liquid level is within the set range.

[0089] In this embodiment, the wastewater generated during fuel cell operation, carrying temperature, is directed to the fuel cell inlet temperature and humidity regulating device. This enables the recovery and reuse of the wastewater and waste heat generated by the fuel cell. The inlet flow rate is regulated by an inlet flow rate regulating valve located at the inlet to regulate the water temperature within the fuel cell inlet temperature and humidity regulating device. The outlet flow rate regulating valve at the outlet ensures that the liquid level remains relatively stable, thereby ensuring that the air humidity in different air intake areas is maintained at a relatively constant level or not too low. This also ensures heat exchange efficiency, thereby guaranteeing the controllability and smoothness of air temperature and humidity regulation. Furthermore, this simplifies the logic control of this disclosure, making the regulation more timely and shortening the response time.

[0090] A water flow regulating valve is installed at the outlet of the fuel cell inlet temperature and humidity regulating device. The liquid level in the fuel cell inlet temperature and humidity regulating device is adjusted by changing the opening of this valve. Specifically, in this embodiment, considering actual operating conditions, the error range X0 between the liquid level in the fuel cell inlet temperature and humidity regulating device and the target liquid level can be controlled to be 5mm ≤ X0 ≤ 500mm, with the error percentage controlled within 30%. Of course, in other embodiments, the liquid level can also be controlled by a first temperature difference T. X ≤5℃, first humidity difference H X ≤20% is the adjustment standard, that is, at the first temperature difference T X First humidity difference H x Under certain conditions, it is not necessary to maintain the liquid level within a certain range; especially when the first humidity difference H... x If the humidity requirement is not met, the liquid level in the fuel cell inlet temperature and humidity control device can be increased to meet the humidity requirement.

[0091] In another embodiment of the present invention, based on, but not limited to, the above embodiments, step S 300 The specific steps include:

[0092] When the first temperature difference T X When the temperature is ≥2℃, follow these steps:

[0093] The water in the fuel cell inlet temperature and humidity control device is heated to increase the outlet temperature of the air exiting the fuel cell inlet temperature and humidity control device.

[0094] When the first temperature difference T X When the temperature is ≥-2℃, follow these steps:

[0095] The water in the fuel cell inlet temperature and humidity control device is cooled down to reduce the outlet temperature of the air exiting the fuel cell inlet temperature and humidity control device.

[0096] When the first humidity difference H X When ≥5%, perform the following steps:

[0097] Adjust the air intake ratio between the air intake area with high humidity and the air intake area with low humidity, so that the air intake proportion of the air intake area with high humidity increases, while the air intake proportion of the air intake area with low humidity decreases.

[0098] When the first humidity difference H X When ≥-5%, perform the following steps:

[0099] The air intake ratio of the air intake area with high humidity and the air intake area with low humidity is adjusted so that the air intake proportion of the air intake area with high humidity is reduced, while the air intake proportion of the air intake area with low humidity is increased.

[0100] In this embodiment, by further limiting the error range, the actual temperature and humidity of the air entering the stack are ensured to be closer to the target adjusted temperature and humidity, thereby ensuring the operating performance of the fuel cell (stack).

[0101] It is worth noting that the order of the steps in this disclosure is not limited. Unless there is a specific order between the steps, the order of the steps can be adjusted.

[0102] Please see Figure 4 As shown, this embodiment of the invention also provides a temperature and humidity control system for a fuel cell system, including: a fuel cell A-1, an air system, and a controller for performing the temperature and humidity control method of the fuel cell system described above; wherein, the air system includes an air compressor C-3 and a fuel cell inlet temperature and humidity regulating device C-5; the fuel cell inlet temperature and humidity regulating device C-5 includes: a housing 1 for storing liquid and at least two air inlet pipes; the outlet end of each air inlet pipe extends into the housing 1, and the outlet ends of at least two air inlet pipes are parallel to the liquid surface (liquid surface line 10). The distances of the 0) are different; each air inlet pipe is equipped with an air flow regulating valve at the air inlet end; the housing 1 is equipped with an air outlet 101, a water inlet 102 and a water outlet 103; the air outlet 101 is higher than the liquid surface, and the water outlet 103 is lower than the liquid surface; the exhaust port of the air compressor C-3 is connected to the air inlet pipe, and the air outlet 101 is connected to the air inlet of the fuel cell A-1 through the air outlet pipe 8; the drain pipe of the fuel cell A-1 is connected to the water inlet 102; the air outlet pipe 8 is equipped with an exhaust gas temperature sensor and an exhaust gas humidity sensor (i.e., an integrated temperature and humidity sensor 9).

[0103] In some embodiments, the air system includes an air filter C-1, a flow and temperature sensor C-2, an air compressor C-3, a first temperature sensor C-4, and a fuel cell inlet air and humidity control device C-5.

[0104] In this embodiment, a water storage chamber C-10 is provided to ensure the water supply temperature and quantity. Excess water can be discharged through the water storage chamber C-10 or through the tank 1 to the external environment. In other embodiments, when the water produced by the fuel cell A-1 meets the water temperature and quantity regulation requirements of the tank 1, and there is no need to recycle the water discharged from the tank 1, the excess water in the tank 1 can be directly discharged to the external environment. The outlet of the fuel cell inlet temperature and humidity regulating device C-5 is connected to the water storage chamber C-10 through a water pipe to discharge excess water into the water storage chamber C-10, and excess air in the water storage chamber C-10 is discharged through the air exhaust pipe.

[0105] Please see Figure 4 As shown, in this embodiment, a water pump W-1 and a second temperature sensor W-2 are also connected between the fuel cell inlet temperature and humidity regulating device C-5 and the water storage chamber C-10. When the water volume of the fuel cell inlet temperature and humidity regulating device C-5 is insufficient, the water pump W-1 is activated to pump the water in the water storage chamber C-10 into the fuel cell inlet temperature and humidity regulating device C-5.

[0106] In practical applications, the operating temperature Tfc of fuel cell A-1 is generally 60-90℃; the humidity of fuel cell A-1 during normal operation is Hp, generally 40-80%; the pressure of fuel cell A-1 during normal operation is Pm, generally 50kPa-150kPa (gauge pressure); and the outlet temperature of air compressor C-3 is TCP.

[0107] In this embodiment of the fuel cell system, the temperature and humidity control system operates as follows: Air enters the air filter C-1 for filtration. The airflow into fuel cell A-1 is monitored by flow and temperature sensors C-2. The air is then pressurized by air compressor C-3, increasing its temperature, which is measured by the first temperature sensor C-4. The air then flows through the fuel cell inlet temperature and humidity regulating device C-5 for temperature and humidity adjustment. After pressure measurement by pressure sensor C-7 and passing through the air intake throttle valve C-8, the air enters fuel cell A-1. Inside fuel cell A-1, the air undergoes an electrochemical reaction with hydrogen, producing electricity, water, and heat. Unreacted air is discharged to the atmosphere through the air back pressure valve C-9, water storage chamber C-10, and air exhaust pipe C-11. The water carrying heat is collected in the water storage chamber C-10. Normally, the bypass valve C-6 is closed.

[0108] In this embodiment of the invention, the temperature and humidity control system of the fuel cell system operates at low power conditions. At this point, the air flow and pressure required by fuel cell A-1 are relatively low, and the target speed of air compressor C-3 is Sc. This may cause the outlet air temperature of air compressor C-3 to be lower than the normal operating temperature of fuel cell A-1, i.e., Tcp < Tfc. Therefore, it is necessary to increase the speed Sc of air compressor C-3 to make Tcp > Tfc. Simultaneously, it is necessary to open the bypass valve C-6 to a certain angle and open the air intake throttle valve C-8. By adjusting the opening degrees of the bypass valve C-6 and the air back pressure valve C-9, the air flow and pressure entering fuel cell A-1 are adjusted.

[0109] Of course, in other embodiments, in order to ensure the air temperature, the water inside the housing 1 can be heated by a heater and a heat exchanger, thereby raising the air temperature. In this way, the operating power of the air compressor C-3 can be reduced while ensuring the air supply. At this time, the bypass valve C-6 can be opened or closed according to actual needs. This is more energy-efficient than relying solely on the air compressor C-3 to ensure the air inlet temperature.

[0110] In this embodiment of the invention, the fuel cell inlet temperature and humidity control system operates at high power. The target speed of air compressor C-3 is Sc, and the outlet air temperature of air compressor C-3 is higher than the normal operating temperature of fuel cell A-1, i.e., Tcp > Tfc. The high-temperature, low-humidity air entering the fuel cell inlet temperature and humidity control device C-5 of this embodiment can undergo active cooling and humidification. Water flows from the water storage chamber C-10 into the inlet 102 of the fuel cell inlet temperature and humidity control device C-5 via water pump W-1. The flow rate of water entering the housing 1 is adjusted by regulating the opening of the inlet flow regulating valve 13, thereby regulating the air temperature inside the housing 1. Water flowing out from the outlet 103 of the fuel cell inlet temperature and humidity control device C-5 is recycled back into the water storage chamber C-10, preventing water waste and ensuring full utilization of water resources.

[0111] The water in the water storage chamber C-10 generally comes from the water produced by the fuel cell A-1. The water is cooled down by pressure reduction, flow in the pipeline, and natural cooling in the water storage chamber C-10. Therefore, the water temperature TW measured by the second temperature sensor W-2 is less than Tfc.

[0112] The water in this embodiment of the invention comes from the water produced by fuel cell A-1 (which carries a certain temperature). Depending on the needs, water at a suitable temperature can be introduced into the tank 1 to cool (e.g., in summer or tropical regions) and heat (e.g., in winter or cold regions) the air flowing through it, thus meeting the temperature and humidity requirements for air entering the stack, while saving energy and energy consumption.

[0113] In addition, the fuel cell inlet temperature and humidity control device C-5 includes a housing 1 and at least two inlet pipes; one end of each inlet pipe extends into the housing 1, and the outlet ends of at least two inlet pipes are at different distances from the liquid surface inside the housing 1, that is, the lengths of the at least two inlet pipes extending into the housing 1 are different; each inlet pipe is equipped with an inlet flow regulating valve; the housing 1 is provided with an outlet 101, a water inlet 102 and a water outlet 103, the outlet 101 is higher than the liquid surface inside the housing 1, and the water outlet 103 is lower than the liquid surface inside the housing 1.

[0114] Specifically, in this embodiment, please refer to... Figure 5 As shown, the fuel cell inlet temperature and humidity control device is divided into a first region (i.e., region A in the attached diagram), a second region (i.e., region B in the attached diagram), and a third region (i.e., region C in the attached diagram) according to different air humidity levels. The housing 1 has three inlet pipes: a first inlet pipe 2 located in the first region, a second inlet pipe 3 located in the second region, and a third inlet pipe 4 located in the third region. The inlet end of the first inlet pipe 2 is also equipped with a first inlet flow regulating valve 5 (i.e., the...). Figure 5 In the N-1 section, the second intake pipe 3 is also equipped with a second intake flow regulating valve 6 (i.e., an auxiliary valve). Figure 5 In the N-2 section, the third intake pipe 4 is also equipped with a third intake flow regulating valve 7 (i.e., an auxiliary valve). Figure 5 (N-3 in the middle).

[0115] Furthermore, since the bottom of the housing 1 is flush with the ground, the height of the outlet end of the first air inlet pipe 2 from the bottom of the housing 1 is H1, the height of the outlet end of the second air inlet pipe 3 from the bottom of the housing 1 is H2, and the height of the outlet end of the third air inlet pipe 4 from the bottom of the housing 1 is H3, and H1>H2>H3. That is, the distance between the outlet end of the first air inlet pipe 2 and the liquid surface (i.e., liquid level line 100) is less than the distance between the outlet end of the second air inlet pipe 3 and the liquid surface (i.e., liquid level line 100) is less than the distance between the outlet end of the third air inlet pipe 4 and the liquid surface (i.e., liquid level line 100).

[0116] In practical applications, a liquid level sensor can be installed inside the tank 1 to detect and monitor the water level. Of course, in other embodiments, the bottom of the tank 1 may not be flush with the surface.

[0117] To clearly demonstrate the arrangement of the three air intake pipes inside housing 1, Figure 6 The cover plate is not shown in box 1.

[0118] In embodiments of the present invention, due to the air outlets of the first air inlet pipe 2, the second air inlet pipe 3, and the third air inlet pipe 4 (i.e. Figure 6 , Figure 7The height of the lower end of each tank from the bottom of the tank 1 varies, and the water level inside the tank 1 reaches the liquid level line 100 (attached). Figure 7 As shown, since the first air inlet pipe 2, the second air inlet pipe 3, and the third air inlet pipe 4 are immersed in the liquid at different heights, the air coming out of each of the first air inlet pipe 2, the second air inlet pipe 3, and the third air inlet pipe 4 has different contact time with the water after entering the water in the box 1. This results in different degrees of humidification of the gas coming out of the first air inlet pipe 2, the second air inlet pipe 3, and the third air inlet pipe 4 in the box 1. In this way, by adjusting the amount of air entering each different air inlet pipe, the humidity of the air at the outlet 101 can be adjusted.

[0119] In addition, the exhaust port of air compressor C-3 is connected to the intake pipe (air inlet manifold 19), and the outlet 101 is connected to the air inlet of fuel cell A-1; the drain pipe of fuel cell A-1 is connected to the water inlet 102. In this way, the temperature and humidity of the fuel cell inlet air can be regulated by fuel cell inlet temperature and humidity regulating device C-5 to meet the usage requirements of fuel cell A-1.

[0120] In an embodiment of the present invention, the height H1 between the lower end of the first air inlet pipe 2 and the bottom of the box 1 is the greatest, so the contact time between the gas entering from the first air inlet pipe 2 and the water in the box 1 is the shortest. The relative humidity of the gas exiting through the first air inlet pipe 2 is denoted as V1.

[0121] The height H3 between the lower end of the third air inlet pipe 4 and the bottom of the box 1 is the smallest, so the contact time between the gas entering from the third air inlet pipe 4 and the water in the box 1 is the longest. The relative humidity of the gas exiting through the third air inlet pipe 4 is denoted as V3.

[0122] Similarly, if the relative humidity of the gas exiting through the second intake pipe 3 is denoted as V2, then V3>V2>V1.

[0123] In an embodiment of the present invention, the height H3 is set to be such that 1 / 3 of the rated flow gas can be humidified to a relative humidity of V3 through the third air inlet pipe 4, where V3 > 85%.

[0124] When the height H2 is set to 1 / 3 of the rated flow rate, the gas passing through the second air inlet pipe 3 can be humidified to a height with a relative humidity of V2, where 50% ≤ V2 ≤ 70%.

[0125] When the height H1 is set to 1 / 3 of the rated flow rate, the gas passing through the first inlet pipe 2 can be humidified to a height with a relative humidity of V1, where 0% ≤ V1 ≤ 30%.

[0126] Of course, in other embodiments, the arrangement of the position and number of air inlet pipes can also be achieved by setting other humidity gradients, so as to ensure the humidification and heat exchange performance of the fuel cell air inlet temperature and humidity regulating device disclosed in this embodiment of the invention, meet the real-time requirements of different types of fuel cells A-1 for the temperature and humidity of the inlet air under different operating conditions, ensure the stable and reliable operation of fuel cell A-1, avoid and reduce the adverse effects of air not meeting the current operating conditions on fuel cell A-1 or its operating conditions, thereby ensuring the normal and stable operation of fuel cell A-1, and extending the service life of fuel cell A-1.

[0127] Please see Figure 6 , 7 As shown, in this embodiment of the invention, the air intake ends of the first air intake pipe 2, the second air intake pipe 3, and the third air intake pipe 4 converge at the air inlet manifold 19. That is, after the air enters from the air inlet manifold 19, it is divided into three branch pipes (the first air intake pipe 2, the second air intake pipe 3, and the third air intake pipe 4), and then enters the housing 1 through the three branch pipes respectively. The air entering from the three air intake pipes exchanges heat with water and humidifies in the housing 1.

[0128] Therefore, by adjusting the temperature of the water inside the tank 1, the temperature of the gas exiting from the outlet 101 can be adjusted. That is, by adjusting the temperature of the water entering the tank 1 from the inlet 102, the temperature of the gas exiting from the outlet 101 can be adjusted. For example, water produced by fuel cell A-1 (which carries a certain temperature) can be supplied to the tank 1 to adjust the temperature of the water inside the tank 1. This can be achieved by increasing the flow rate or speed, or by adjusting the input cycle (because the water produced by fuel cell A-1 loses heat over time, the time, flow rate, and speed at which it is discharged into the tank 1 can all adjust the temperature of the water inside the tank 1).

[0129] In other embodiments, a heater or heat exchanger may be installed inside the housing 1 to heat or exchange heat with the water inside the housing 1, so as to adjust the temperature of the water inside the housing 1 to a suitable temperature, so that the present application can heat the water in a low temperature environment (such as -30°C and below), thereby raising the temperature of the air flowing through the water, so as to meet the stack temperature requirements of the air entering the fuel cell A-1, protect the fuel cell A-1, and extend its service life.

[0130] Of course, a heater and a heat exchanger can be installed simultaneously inside housing 1 to ensure normal operation in extreme environments. In practical applications, the heater can be an electric heater or an electromagnetic heater. The heat exchanger tubes can pass through housing 1 and extend out to connect with a heat source. The heat source flows through the heat exchanger tubes built into housing 1 to exchange heat with water and / or air, thereby raising the temperature of the air to meet its reactor inlet temperature requirements.

[0131] The outlet temperature of the air can be adjusted by regulating the temperature of the water entering the housing 1 through the inlet 102. The device in this embodiment can actively regulate the temperature and humidity of the air entering the fuel cell to meet the fuel cell's requirements for incoming air under different operating conditions.

[0132] In this embodiment of the invention, the outlet end of each air inlet pipe is composed of multiple independent sub-outlets, each of which is connected to the air inlet end of the air inlet pipe. This allows for more dispersed air output, increases the contact area between the gas and the liquid, and results in superior humidification and heat exchange effects.

[0133] Furthermore, the inner diameter D of the sub-outlet can be controlled within the range of 1mm ≤ D ≤ 40mm to ensure its humidification and heat exchange effect. Specifically, the inlet pipe includes a cylinder and an outlet plate, the outlet plate having multiple outlet holes, and the outlet plate being connected to the cylinder. In practical applications, the outlet plate can be a flat plate structure or a frame structure, with at least one side having multiple outlet holes. The outlet plate and the cylinder can be connected by welding, integral molding, screwing, or snap-fitting.

[0134] Therefore, in this embodiment of the invention, the fuel cell inlet temperature and humidity regulating device C-5 humidifies the air entering through the intake pipe using water within the housing 1. The degree of humidification is adjusted by regulating the airflow rate into different intake pipes, thereby regulating the outlet humidity of the air at the outlet 101. Simultaneously, the outlet temperature of the air at the outlet 101 can be adjusted by regulating the temperature of the water entering the housing 1 from the inlet 102. This device can actively regulate the temperature and humidity of the air entering the fuel cell A-1 to meet the requirements of the fuel cell A-1 for incoming air under different operating conditions.

[0135] Please see Figure 6 , 7 As shown, in this embodiment of the invention, an outlet pipe 8 is connected to the outlet 101, and the outlet pipe 8 is equipped with an outlet gas temperature sensor and an outlet gas humidity sensor. By setting an integrated temperature and humidity sensor 9 on the outlet pipe 8, the outlet gas temperature and outlet humidity can be detected simultaneously.

[0136] Furthermore, in this embodiment of the invention, an air flow meter 10 is provided on the air outlet pipe 8 to detect the air flow rate.

[0137] In this embodiment of the invention, a water inlet pipe 11 is connected to the water inlet 102, and a water inlet temperature sensor 12 is provided on the water inlet pipe 11 to detect the water inlet temperature.

[0138] Further, please refer to Figure 7 As shown, in this embodiment of the invention, the water inlet pipe 11 is also provided with a water inlet flow regulating valve 13 and a water inlet flow meter 14, wherein the water inlet flow regulating valve 13 is used to regulate the water inlet flow, and the water inlet flow meter 14 is used to detect the water inlet flow.

[0139] Please see Figure 7 As shown, in this embodiment of the invention, a water outlet 103 is connected to a water outlet pipe 15. The water outlet pipe 15 is equipped with a water flow regulating valve 16 and a water flow meter 17. The water flow regulating valve 16 is used to regulate the water flow, and the water flow meter 17 is used to detect the water flow.

[0140] In this embodiment of the invention, the tank 1 is equipped with a water temperature sensor 18 to detect the temperature of the water inside the tank 1. Of course, multiple water temperature sensors 18 can also be set at different positions inside the tank 1 to detect the average temperature of the water inside the tank 1.

[0141] The fuel cell inlet temperature and humidity regulating device C-5 of this embodiment of the invention is used to regulate the outlet temperature, which can be done by following these steps:

[0142] The target adjustment temperature at outlet 101 of fuel cell A-1 under a certain operating condition is T. m The real-time temperature of the first intake air at point 19 of the air inlet manifold was measured to be T. I Another T Q =T m -T I .

[0143] If T Q If the temperature is greater than 0, it indicates that the intake air temperature is lower than the target value, and the air needs to be heated. Therefore, the temperature of the water entering the chamber 1 is adjusted so that the temperature of the water entering the chamber 1 (detected by the inlet water temperature sensor 12) is greater than T. m ;

[0144] Then, the average temperature T of the water in tank 1 is adjusted by increasing the flow rate of water entering tank 1 (adjusted by the inlet flow regulating valve 13 and detected by the inlet flow meter 14). c (Because the water temperature discharged from fuel cell A-1 is higher than the water temperature inside tank 1), this achieves the purpose of increasing the outlet gas temperature. The water level inside tank 1 can be adjusted by regulating the opening of the outlet water flow regulating valve 16.

[0145] If T Q If the temperature is less than 0, it indicates that the intake air temperature is higher than the target value, and the air needs to be cooled. Therefore, the temperature of the water entering chamber 1 should be adjusted to be less than T. m ;

[0146] Then, by reducing the flow rate of water entering tank 1, the average temperature T of the water in tank 1 is adjusted. c This achieves the purpose of reducing the outlet air temperature.

[0147] The fuel cell inlet temperature and humidity regulating device C-5 of this embodiment of the invention is used to regulate the outlet air humidity, which can be done according to the following steps:

[0148] The target humidity adjustment for the air under a certain operating condition during the operation of fuel cell A-1 is H. m The real-time humidity at the air outlet 101 was measured using the integrated temperature and humidity sensor 9. u , where H X =H m -H u .

[0149] If H X If the humidity is ≥5%, it indicates that the outlet air humidity is too low. In this case, reduce the opening of the first inlet flow regulating valve 5 and increase the opening of the second inlet flow regulating valve 6 and the third inlet flow regulating valve 7 to improve the outlet air humidity.

[0150] If H X If the humidity is ≤-5%, it indicates that the humidity of the exhaust air is too high. In this case, increase the opening of the first intake flow regulating valve 5 and decrease the opening of the second intake flow regulating valve 6 and the third intake flow regulating valve 7 to reduce the humidity of the exhaust air.

[0151] The outlet 103 (outlet pipe 15) of the fuel cell inlet temperature and humidity regulating device C-5 in this embodiment of the invention can be connected to the inlet end of the drain pipe of fuel cell A-1, or it can be connected to the external environment. In practical applications, the outlet (outlet pipe 15) forms a circulation with the drain pipe, the inlet 102 (inlet pipe 11), and the inside of the tank 1 to ensure the stable maintenance of the water temperature inside the tank 1 under any operating conditions.

[0152] Please see Figure 8 As shown, the controller for the temperature and humidity control method of a fuel cell system in this embodiment of the invention includes an acquisition unit, a calculation unit, and an adjustment unit, wherein:

[0153] The acquisition unit is used to acquire the target set temperature T of the current fuel cell inlet air. m Adjust humidity H to target m It is also used to obtain the real-time temperature T of the air inlet temperature and humidity regulating device of the fuel cell. C and real-time humidity H u ;

[0154] A calculation unit is used to adjust the temperature T according to the target. m Adjust the humidity H to the target m The real-time temperature T of the air entering and exiting the fuel cell inlet temperature and humidity control device C and real-time humidity H u Determine the first temperature difference T X and the first humidity difference Hx , among which, T X =T m -T C H x =H m -H u ;

[0155] The regulating unit is used to adjust the water temperature of the fuel cell inlet temperature and humidity regulating device and / or adjust the intake ratio of the intake areas of the fuel cell inlet temperature and humidity regulating device that have different humidity levels, so as to make the first temperature difference T X ≤5℃, first humidity difference H X ≤20%.

[0156] Specifically, in this embodiment, the controller is electrically connected to the fuel cell, temperature sensor, pressure sensor, humidity sensor, flow regulating valve, etc. The controller can receive relevant instructions from the fuel cell, temperature sensor, pressure sensor, humidity sensor, flow regulating valve, etc., and control the operation of each flow regulating valve according to the relevant information.

[0157] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the scope of protection of this invention.

Claims

1. A temperature and humidity control system for a fuel cell system, characterized in that, include: A fuel cell, an air system, and a controller; wherein the air system includes an air compressor and a fuel cell inlet temperature and humidity regulating device; wherein the fuel cell inlet temperature and humidity regulating device includes: a housing for storing liquid and at least two air inlet pipes; the outlet end of each air inlet pipe extends into the housing, and the distances between the outlet ends of at least two air inlet pipes and the liquid surface are different; the bottom of the housing is flush with the housing, and the at least two air inlet pipes include a first air inlet pipe, a second air inlet pipe, and a third air inlet pipe; the height of the outlet end of the first air inlet pipe from the bottom of the housing is H1, the height of the outlet end of the second air inlet pipe from the bottom of the housing is H2, and the height of the outlet end of the third air inlet pipe from the bottom of the housing is H3; wherein H1>H2>H3; each air inlet pipe is provided with an air flow regulating valve at its inlet end; the housing is provided with an air outlet, a water inlet, and a water outlet; the air outlet is higher than the liquid surface, and the water outlet is lower than the liquid surface; The exhaust port of the air compressor is connected to the intake pipe, and the exhaust port is connected to the air inlet of the fuel cell through the exhaust pipe; the drain pipe of the fuel cell is connected to the water inlet; the exhaust pipe is equipped with an exhaust gas temperature sensor and an exhaust gas humidity sensor. The controller is used to execute the temperature and humidity control method of the fuel cell system, the temperature and humidity control method including: S 100 : Obtain the target set temperature T of the current fuel cell inlet air. m Adjust humidity H to target m ; S 200 : Obtain the real-time temperature T of the air entering the fuel cell air temperature and humidity control device. C and real-time humidity H u ; S 300 Adjusting the water temperature and / or adjusting the intake ratio of the intake areas with different humidity levels in the fuel cell inlet temperature and humidity regulating device to achieve a first temperature difference. First humidity difference Among them, T X =T m -T C H x =H m -H u .

2. The temperature and humidity control system for a fuel cell system according to claim 1, characterized in that, The temperature and humidity control method also includes: S 400 : Obtain the first real-time intake temperature T of the air entering the fuel cell intake air and humidity regulating device. I And calculate the second temperature difference T. Q =T m -T I ; S 500 Determine the second temperature difference T Q The size of the device is adjusted, and the water temperature inside the fuel cell inlet air and humidity regulating device is adjusted so that the outlet air temperature of the fuel cell inlet air and humidity regulating device is close to the target adjustment temperature T. m .

3. The temperature and humidity control system for a fuel cell system according to claim 1, characterized in that, In step S 300 Specifically, adjusting the water temperature of the fuel cell inlet temperature and humidity regulating device includes: adjusting the opening degree of the inlet water flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device; or, turning the heater on or off to adjust the water temperature of the fuel cell inlet temperature and humidity regulating device; or, turning the heat exchanger on or off to adjust the water temperature of the fuel cell inlet temperature and humidity regulating device.

4. The temperature and humidity control system for a fuel cell system according to claim 1, characterized in that, In step S 300 Specifically, adjusting the intake ratio of the intake areas with different humidity levels in the intake air of the fuel cell intake temperature and humidity regulating device includes: adjusting the opening degree of the intake flow regulating valve at the intake port of different intake areas.

5. The temperature and humidity control system for a fuel cell system according to claim 2, characterized in that, In step S 500 Among them, the determination of the second temperature difference T Q The specific steps for adjusting the size and water temperature in the fuel cell inlet temperature and humidity regulating device include: S 510 If T Q If the value is greater than 0, then the opening of the water flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device is increased to increase the water flow from the fuel cell to the fuel cell inlet temperature and humidity regulating device, thereby raising the temperature of the water in the fuel cell inlet temperature and humidity regulating device. S 520 If T Q If the value is less than 0, then the opening of the water flow regulating valve at the inlet of the fuel cell inlet temperature and humidity regulating device is reduced to decrease the water flow from the fuel cell to the fuel cell inlet temperature and humidity regulating device, thereby cooling the water in the fuel cell inlet temperature and humidity regulating device. S 530 Adjust the opening of the water flow regulating valve at the outlet of the fuel cell inlet temperature and humidity regulating device to adjust the liquid level value in the fuel cell inlet temperature and humidity regulating device, so that the liquid level error between the liquid level value and the target liquid level is within the set range.

6. The temperature and humidity control system for a fuel cell system according to any one of claims 1-5, characterized in that, Step S 300 The specific steps include: When the first temperature difference T X When the temperature is ≥2℃, follow these steps: The water in the fuel cell inlet temperature and humidity control device is heated to increase the outlet temperature of the air exiting the fuel cell inlet temperature and humidity control device. When the first temperature difference T X When the temperature is ≤-2℃, follow these steps: The water in the fuel cell inlet temperature and humidity control device is cooled down to reduce the outlet temperature of the air exiting the fuel cell inlet temperature and humidity control device. When the first humidity difference H X When ≥5%, perform the following steps: Adjust the air intake ratio between the air intake area with high humidity and the air intake area with low humidity, so that the air intake proportion of the air intake area with high humidity increases, while the air intake proportion of the air intake area with low humidity decreases. When the first humidity difference H X When ≤-5%, perform the following steps: The air intake ratio of the air intake area with high humidity and the air intake area with low humidity is adjusted so that the air intake proportion of the air intake area with high humidity is reduced, while the air intake proportion of the air intake area with low humidity is increased.

7. The temperature and humidity control system for a fuel cell system according to claim 1, characterized in that: An air flow meter is installed on the air outlet pipe; and / or, A water inlet pipe is connected to the water inlet, and the water inlet pipe is equipped with a water inlet temperature sensor and / or a water inlet flow regulating valve; and / or, The inlet pipe is equipped with an inlet flow meter; and / or, The chamber is equipped with an internal water temperature sensor; and / or A water outlet pipe is connected to the water outlet, and the water outlet pipe is equipped with a water flow regulating valve and / or a water flow meter.

8. The temperature and humidity control system for a fuel cell system according to claim 1, characterized in that: Each of the air inlet pipes has an outlet end consisting of multiple independent sub-outlets, each of the sub-outlets communicating with the air inlet end of the air inlet pipe; and / or, The outlet is connected to the inlet of the drainage pipe; and / or, The outlet of the fuel cell inlet temperature and humidity regulating device is connected to the external environment.

9. The temperature and humidity control system for a fuel cell system according to any one of claims 7-8, characterized in that, The controller includes: The acquisition unit is used to acquire the target set temperature T of the current fuel cell inlet air. m Adjust humidity H to target m It is also used to obtain the real-time temperature T of the air inlet temperature and humidity regulating device of the fuel cell. C and real-time humidity H u ; A calculation unit is used to adjust the temperature T according to the target. m Adjust the humidity H to the target m The real-time temperature T of the air entering and exiting the fuel cell inlet temperature and humidity control device C and real-time humidity H u Determine the first temperature difference T X and the first humidity difference H x , among which, T X =T m -T C H x =H m -H u ; The regulating unit is used to adjust the water temperature of the fuel cell inlet temperature and humidity regulating device and / or adjust the intake ratio of the intake areas of the fuel cell inlet temperature and humidity regulating device that result in different humidity levels in the air flowing through it, so as to achieve a first temperature difference. First humidity difference .

Images