CN115548386B - Method for determining hydrogen metering ratio of fuel cell system and fuel cell system - Google Patents

Abstract

The application discloses a hydrogen metering ratio determining method of a fuel cell system and the fuel cell system, and belongs to the field of fuel cells. The method comprises the following steps: acquiring an inlet temperature, an inlet pressure and an outlet pressure of a hydrogen circulation device of the fuel cell system, and acquiring a stack current of a fuel cell stack of the fuel cell system; determining a gas state impact factor of the fuel cell system based on the inlet temperature, the inlet pressure, and the outlet pressure; determining a hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, the inlet pressure, the gas state influence factor, and a gas utilization rate of the fuel cell system, the gas utilization rate being determined based on an operating condition of the fuel cell system; determining a hydrogen consumption amount of the fuel cell system based on the stack current; the hydrogen metering ratio of the fuel cell system is determined based on the hydrogen circulation flow rate and the hydrogen consumption amount. The method has the advantages of high response speed of determining the hydrogen metering ratio, no need of changing the pipeline structure, and effective reduction of the system cost.

Description

Method for determining hydrogen metering ratio of fuel cell system and fuel cell system

technical field

The present application belongs to the technical field of fuel cells, and in particular relates to a hydrogen metering ratio determination method of a fuel cell system and a fuel cell system.

Background technique

Fuel cell is a kind of power generation device that can directly convert the chemical energy of fuel into electrical energy. It has the advantages of high energy conversion efficiency, clean and pollution-free, and its commercial application has broad development prospects.

When the fuel cell system is working, it is often necessary to pass excess hydrogen into the anode through circulation to improve the utilization rate of hydrogen and meet the water management balance of the fuel cell. However, the hydrogen gas circulating inside the fuel cell has a high relative humidity and contains part of the nitrogen gas that penetrates from the cathode to the anode. The general gas flowmeter can only test the flow rate of a specific dry gas. For the gas with wet gas and humidity change There is a large error in flow measurement, which leads to low calculation accuracy of hydrogen gas metering ratio in fuel cell system.

At present, a gas flow meter is added through the back end of the hydrogen pressure reducing valve, and a temperature and humidity sensor is installed in the hydrogen circulation loop and the hydrogen feed loop to measure the flow rate of the dry gas, the relative humidity of the loop loop and the stack loop, according to Based on the principle of mass conservation, the gas flow in the circulation loop is calculated, and then the circulating hydrogen flow is calculated according to the humidity of the circulating gas, and the metering ratio of hydrogen is finally determined. This type of method requires additional installation of a gas flow meter and two temperature and humidity sensors. The pipeline structure increases the cost of the fuel cell system and limits the practicality.

Contents of the invention

This application aims to solve at least one of the technical problems existing in the prior art. For this reason, the present application proposes a method for determining the metering ratio of hydrogen in a fuel cell system and a fuel cell system to realize accurate measurement of the metering ratio of hydrogen, which has a simple structure, low cost, and strong practicability.

In a first aspect, the present application provides a method for determining a hydrogen metering ratio of a fuel cell system, the method comprising:

Obtain the inlet temperature, inlet pressure and outlet pressure of the hydrogen circulation device of the fuel cell system, and obtain the stack current of the fuel cell stack of the fuel cell system;

determining a gas state influencing factor of the fuel cell system based on the inlet temperature, the inlet pressure, and the outlet pressure;

Determine the hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, the inlet pressure, the gas state influencing factor and the gas utilization rate of the fuel cell system, the gas utilization rate is based on the fuel cell system Determination of operating conditions;

determining the hydrogen consumption of the fuel cell system based on the stack current;

A hydrogen metering ratio of the fuel cell system is determined based on the hydrogen circulation flow rate and the hydrogen consumption.

According to the hydrogen metering ratio determination method of the fuel cell system of the present application, the hydrogen circulation flow rate is calculated by measuring the temperature and pressure data at the inlet and outlet of the hydrogen circulation device, combined with the hydrogen consumption, the hydrogen metering ratio is determined, the response speed is fast, and the calculation result is accurate High degree, no need to change the pipeline structure of the fuel cell system, which can effectively reduce the system cost.

According to an embodiment of the present application, the determining the gas state influencing factor of the fuel cell system based on the inlet temperature, the inlet pressure and the outlet pressure includes:

Based on the inlet temperature and the inlet pressure, determining the water vapor volume fraction at the inlet of the hydrogen circulation device;

determining the pressure difference between the inlet and outlet of the hydrogen circulation device based on the inlet pressure and the outlet pressure;

The gas state influencing factor is determined based on the inlet pressure, the inlet and outlet pressure difference, the inlet temperature and the water vapor volume fraction.

According to an embodiment of the present application, the determination of the water vapor volume fraction at the inlet of the hydrogen circulation device based on the inlet temperature and the inlet pressure includes:

Based on the inlet temperature, determining the saturated vapor pressure corresponding to the inlet temperature;

Based on the inlet pressure and the saturation vapor pressure, the water vapor volume fraction is determined.

According to an embodiment of the present application, the determining the hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, the inlet pressure, the gas state influencing factor and the gas utilization rate of the fuel cell system includes :

Based on the gas state influencing factor and the gas utilization rate, determine the outlet hydrogen flow rate of the hydrogen circulation device;

Based on the inlet temperature and the inlet pressure, determining the water vapor volume fraction at the inlet of the hydrogen circulation device;

The hydrogen circulation flow rate is determined based on the outlet hydrogen flow rate and the water vapor volume fraction.

According to an embodiment of the present application, the determination of the outlet hydrogen flow rate of the hydrogen circulation device based on the gas state influencing factor and the gas utilization rate includes:

Apply the formula

Q=K*η*λ*n

Determine the outlet hydrogen flow;

Wherein, Q is the hydrogen flow rate at the outlet, K is the volume of the hydrogen circulation device, n is the gas utilization rate, λ is the gas state influencing factor, and n is the speed of the hydrogen circulation device.

According to an embodiment of the present application, after the hydrogen circulation flow rate of the fuel cell system is determined based on the inlet temperature, the inlet pressure, the gas state influencing factor and the gas utilization rate of the fuel cell system , before determining the hydrogen metering ratio of the fuel cell system based on the hydrogen circulation flow rate and the hydrogen consumption, the method further includes:

According to the ideal gas state equation, the hydrogen circulation flow rate is converted into the hydrogen circulation flow rate under standard conditions.

In a second aspect, the present application provides a fuel cell system, which includes:

Hydrogen source;

A gas-water separator, the hydrogen source is connected to the first inlet of the gas-water separator;

A hydrogen circulation device, the inlet of the hydrogen circulation device is connected to the first outlet of the gas-water separator, the inlet of the hydrogen circulation device is provided with a temperature and pressure sensor, and the outlet of the hydrogen circulation device is provided with a pressure sensor, so The temperature and pressure sensor is used to collect the inlet temperature and inlet pressure of the hydrogen circulation device, and the pressure sensor is used to collect the outlet pressure of the hydrogen circulation device;

A fuel cell stack, the fuel cell stack is connected to the outlet of the hydrogen circulation device, and the stack negative electrode of the fuel cell stack is provided with a current sensor, and the current sensor is used to collect the stack current;

a controller, the controller is electrically connected to the hydrogen circulation device, the temperature and pressure sensor, the pressure sensor and the current sensor, and is used to determine the Hydrogen Dosing Ratio for Fuel Cell Systems.

According to the fuel cell system of the present application, by measuring the temperature and pressure data at the inlet and outlet of the hydrogen circulation device, the hydrogen circulation flow rate is calculated, combined with the hydrogen consumption, the hydrogen metering ratio is determined, the response speed is fast, the calculation result is highly accurate, and there is no need to change the fuel The pipeline structure of the battery system can effectively reduce the system cost.

According to an embodiment of the present application, it further includes a first on-off valve and a second on-off valve electrically connected to the controller, the first on-off valve is arranged between the hydrogen source and the first inlet, the The second switching valve is arranged between the hydrogen source and the fuel cell stack.

According to an embodiment of the present application, a pressure reducing valve and a proportional pressure regulating valve are sequentially provided between the hydrogen source and the gas-water separator.

In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the computer program, the following The method for determining the hydrogen metering ratio of the fuel cell system described in the first aspect above.

In a fourth aspect, the present application provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the hydrogen metering of the fuel cell system as described in the first aspect above is realized Than to determine the method.

In a fifth aspect, the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, the method for determining the hydrogen gas metering ratio of the fuel cell system as described in the first aspect above is realized.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is one of the schematic flow charts of the method for determining the hydrogen metering ratio of the fuel cell system provided by the embodiment of the present application;

Fig. 2 is a schematic structural diagram of a fuel cell system provided by an embodiment of the present application;

Fig. 3 is the second schematic flow diagram of the method for determining the hydrogen metering ratio of the fuel cell system provided by the embodiment of the present application;

Fig. 4 is a schematic structural diagram of a device for determining a hydrogen metering ratio of a fuel cell system provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

Reference signs:

Hydrogen source 10, pressure reducing valve 20, proportional pressure regulating valve 30, first on-off valve 41, second on-off valve 42, fuel cell stack 50, gas-water separator 60, temperature and pressure sensor 70, hydrogen circulation device 80, pressure sensor 90.

Detailed ways

The following will clearly describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application belong to the protection scope of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It should be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application can be practiced in sequences other than those illustrated or described herein, and that references to "first," "second," etc. distinguish Objects are generally of one type, and the number of objects is not limited. For example, there may be one or more first objects. In addition, "and/or" in the specification and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

In the related technology, the calculation of the hydrogen metering ratio is mainly through adding a gas flowmeter at the back end of the hydrogen pressure reducing valve, and installing a temperature and humidity sensor in the hydrogen circulation loop and the hydrogen feeding loop to measure the flow rate of the dry gas and the circulation loop. According to the principle of mass conservation and the relative humidity of the stacking loop, the gas flow in the loop is calculated, and then the circulating hydrogen flow is calculated according to the humidity of the circulating gas, and the metering ratio of hydrogen is finally determined.

This type of method requires additional installation of a gas flow meter and two temperature and humidity sensors, changes in the pipeline structure, increases the cost of the fuel cell system, and has limited practicability.

The method for determining the hydrogen metering ratio of the fuel cell system, the device for determining the hydrogen metering ratio of the fuel cell system, the fuel cell system, electronic equipment, and readable storage provided by the embodiments of the present application will be described below in conjunction with the accompanying drawings through specific embodiments and application scenarios. The medium is described in detail.

Wherein, the method for determining the hydrogen metering ratio of the fuel cell system can be applied to the terminal, and specifically can be executed by hardware or software in the terminal.

Such terminals include, but are not limited to, portable communication devices such as mobile phones or tablets with touch-sensitive surfaces (eg, touch screen displays and/or touch pads). It should also be appreciated that in some embodiments, the terminal may not be a portable communication device, but a desktop computer with a touch-sensitive surface (eg, a touchscreen display and/or a touchpad).

In each of the following embodiments, a terminal including a display and a touch-sensitive surface is described. It should be understood, however, that a terminal may include one or more other physical user interface devices such as a physical keyboard, mouse, and joystick.

In the method for determining the hydrogen stoichiometric ratio of the fuel cell system provided in the embodiment of the present application, the execution subject of the method for determining the hydrogen gas stoichiometric ratio of the fuel cell system may be an electronic device or an electronic device capable of implementing the method for determining the hydrogen gas stoichiometric ratio of the fuel cell system Functional modules or functional entities, the electronic devices mentioned in the embodiments of this application include but are not limited to mobile phones, tablet computers, computers, cameras, and wearable devices. The method for determining the stoichiometric ratio of hydrogen in the system will be described.

As shown in FIG. 1 , the method for determining the hydrogen metering ratio of the fuel cell system includes: Step 110 to Step 150 .

Step 110, obtaining the inlet temperature, inlet pressure and outlet pressure of the hydrogen circulation device 80 of the fuel cell system, and obtaining the stack current of the fuel cell stack 50 of the fuel cell system.

The gas output from the fuel cell stack 50 flows into the inlet of the hydrogen circulation device 80 , and returns to the fuel cell stack 50 from the outlet of the hydrogen circulation device 80 .

The inlet temperature of the hydrogen circulation device 80 refers to the temperature at the inlet of the hydrogen circulation device 80, and the hydrogen circulation device 80 inlet is the gas with a certain humidity output by the fuel cell stack 50; the inlet pressure and the outlet pressure of the hydrogen circulation device 80 are respectively hydrogen The pressure at the inlet and outlet of the circulation device 80.

In this embodiment, as shown in FIG. 2, a temperature and pressure sensor 70 can be installed at the inlet of the hydrogen circulation device 80 to collect the inlet temperature and inlet pressure. The temperature and pressure sensor 70 can be two separate sensors, or a two-in-one sensor. A sensor; a current sensor can be set on the fuel cell stack 50 to collect the stack current of the fuel cell stack 50 .

Step 120, based on the inlet temperature, inlet pressure and outlet pressure, determine the gas state influencing factor of the fuel cell system.

Among them, the gas state influencing factor refers to the common factor extracted from the variable group of physical quantities such as the pressure and temperature of the circulating hydrogen.

For example, in actual implementation, it is possible to collect the physical quantities such as pressure and temperature of circulating hydrogen, and obtain the curves of changes in physical quantities such as pressure and temperature through mathematical modeling and simulation, and use the slope of the curve or the parameters of the corresponding mathematical functions as the influence of the gas state Factor, the gas state influencing factor can reflect the gas state of circulating hydrogen.

In this embodiment, according to the inlet temperature, inlet pressure and outlet pressure of the hydrogen circulation device 80, the gas state influencing factor of the hydrogen circulating in the fuel cell system is determined.

Step 130: Determine the hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, inlet pressure, gas state influencing factors and gas utilization rate of the fuel cell system.

Wherein, the gas utilization rate is determined based on the operating conditions of the fuel cell system.

In actual implementation, the gas utilization rate of the fuel cell under different operating conditions can be measured during the experimental stage of the fuel cell, and the gas utilization rate can be determined according to the operating conditions when determining the current hydrogen metering ratio.

In this embodiment, according to the inlet temperature, inlet pressure, gas state influencing factors and gas utilization rate of the fuel cell system, the hydrogen gas flow at the outlet of the hydrogen circulation device 80 can be obtained, that is, the hydrogen circulation flow rate of the fuel cell system can be determined.

Step 140, based on the stack current, determine the hydrogen consumption of the fuel cell system.

In this embodiment, a current sensor can be installed at the negative pole of the fuel cell stack 50, and the current sensor can be used to collect the stack current, and according to the stack current, the hydrogen consumption of the fuel cell stack 50 in the fuel cell system can be determined.

Step 150, based on the hydrogen circulation flow rate and hydrogen consumption, determine the hydrogen metering ratio of the fuel cell system.

It can be understood that the stoichiometric ratio in a fuel cell refers to the ratio of gas supply to consumption.

In this embodiment, the hydrogen gas supply is the sum of the hydrogen circulation flow and hydrogen consumption, and the ratio of the hydrogen circulation flow and hydrogen consumption to the hydrogen consumption is the hydrogen metering ratio of the fuel cell system.

In the embodiment of the present application, by measuring the temperature and pressure data at the inlet and outlet of the hydrogen circulation device 80, the gas state influence factor is determined, and the hydrogen circulation flow rate is calculated when the gas state influence factor and the gas utilization rate are known, combined with the hydrogen consumption , to determine the hydrogen metering ratio, fast response, high accuracy of calculation results, no need to change the pipeline structure of the fuel cell system, and reduce system cost.

In actual implementation, by calculating the hydrogen metering ratio in real time, the hydrogen circulation amount is quickly controlled according to the hydrogen metering ratio and the demand metering ratio, so as to improve the power generation efficiency of the fuel cell stack 50 .

According to the hydrogen metering ratio determination method of the fuel cell system provided by the embodiment of the present application, the hydrogen circulation flow rate is calculated by measuring the temperature and pressure data at the inlet and outlet of the hydrogen circulation device 80, and the hydrogen metering ratio is determined in combination with the hydrogen consumption, and the response speed is fast , the accuracy of the calculation result is high, and there is no need to change the pipeline structure of the fuel cell system, which can effectively reduce the system cost.

In some embodiments, step 120, determining the gas state influencing factor of the fuel cell system based on the inlet temperature, inlet pressure and outlet pressure, may include:

Based on the inlet temperature and the inlet pressure, determine the water vapor volume fraction at the inlet of the hydrogen circulation device 80;

Determine the pressure difference between the inlet and outlet of the hydrogen circulation device 80 based on the inlet pressure and the outlet pressure;

Based on the inlet pressure, inlet and outlet pressure difference, inlet temperature and water vapor volume fraction, the gas state influencing factor is determined.

The pressure-volume-temperature relationship generally refers to the relationship between the pressure, volume and temperature of a gas, and its mathematical expression is also called the equation of state.

In this embodiment, by determining the water vapor volume fraction and the pressure difference between the inlet and outlet, the gas state influencing factor can be determined to reflect the gas state of the circulating hydrogen.

In actual implementation, the gas state influencing factors under different inlet pressures, inlet and outlet pressure differences, inlet temperatures and water vapor volume fractions can be tabulated. When calculating the hydrogen metering ratio, the current inlet pressure, inlet and outlet pressure differences, inlet Parameters such as temperature and water vapor volume fraction, look up the gas state influencing factors corresponding to the current circulating hydrogen.

In some embodiments, based on the inlet temperature and the inlet pressure, determining the water vapor volume fraction at the inlet of the hydrogen circulation device 80 may include:

Based on the inlet temperature, determine the saturated vapor pressure corresponding to the inlet temperature;

Based on the inlet pressure and saturation vapor pressure, the water vapor volume fraction is determined.

In some embodiments, step 130, determining the hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, inlet pressure, gas state influence factor and gas utilization rate of the fuel cell system, may include:

Determine the outlet hydrogen flow rate of the hydrogen circulation device 80 based on the gas state influence factor and the gas utilization rate;

Based on the inlet temperature and the inlet pressure, determine the water vapor volume fraction at the inlet of the hydrogen circulation device 80;

Based on the outlet hydrogen flow rate and the water vapor volume fraction, the hydrogen circulation flow rate is determined.

In this embodiment, the outlet hydrogen flow rate of the hydrogen circulation device 80 can be determined according to the gas state influence factor and the gas utilization rate, and the outlet hydrogen flow rate needs to be corrected, and the outlet hydrogen flow rate is corrected by using the water vapor volume fraction to obtain hydrogen circulation flow.

In some embodiments, the outlet hydrogen flow rate of the hydrogen circulation device 80 is determined based on the gas state influencing factor and the gas utilization rate, including:

Apply the formula

Q=K*η*λ*n

Determine the outlet hydrogen flow;

Wherein, Q is the outlet hydrogen flow rate, K is the volume of the hydrogen circulation device 80, n is the gas utilization rate, λ is the gas state influencing factor, and n is the rotating speed of the hydrogen circulation device 80.

In some embodiments, in step 130, after determining the hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, inlet pressure, gas state influence factor and gas utilization rate of the fuel cell system, in step 150, based on the hydrogen circulation flow rate and the hydrogen consumption, before determining the hydrogen metering ratio of the fuel cell system, the method for determining the hydrogen metering ratio of the fuel cell system may also include:

According to the ideal gas state equation, the hydrogen circulation flow rate is converted to the hydrogen circulation flow rate under standard conditions.

A specific embodiment is introduced below.

As shown in FIG. 3 , the inlet temperature T of the hydrogen circulation device 80 is collected by the temperature and pressure sensor 70 .

According to the inlet temperature T collected by the temperature and pressure sensor 70, the saturated vapor pressure P1 of water at this temperature is obtained by looking up a table or calculating.

The temperature and pressure sensor 70 also collects the inlet pressure P2 of the hydrogen circulation device 80 .

According to the saturated vapor pressure P1 and the inlet pressure P2, the volume fraction of water vapor in the loop of the hydrogen circulation device 80 is calculated ɑ=P1/P2.

The outlet pressure P3 of the hydrogen circulation device 80 is collected by a pressure sensor 90 .

Calculate the inlet and outlet pressure difference ΔP=P3−P2 of the hydrogen circulation device 80 .

According to the current operating condition of the fuel cell stack 50, the gas utilization ratio η is obtained.

According to the inlet and outlet pressure difference ΔP, water vapor volume fraction α, inlet pressure P2 and inlet temperature T, check the table to read the gas state influence factor λ.

The rotational speed n fed back by the hydrogen circulation device 80 is read.

Calculate the outlet hydrogen flow rate Q=K*η*λ*n of the hydrogen circulation device 80 , where K is the volume of the hydrogen circulation device 80 .

According to the water vapor volume fraction ɑ, the outlet hydrogen flow rate Q1 is corrected, where Q1 = Q*(1-ɑ).

According to the ideal gas state equation Pa*Va/Ta=Pb*Vb/Tb, Q1 is converted into the hydrogen circulation flow Q2 under the standard condition, Q2=P2*Ta*Q1/(T*Pa), wherein, Pa, Ta is the pressure and temperature under standard conditions.

Acquire the current I of the current sensor of the fuel cell stack 50, calculate the hydrogen consumption Q3, and calculate the hydrogen metering ratio S=(Q2+Q3)/Q3 of the fuel cell system.

The method for determining the hydrogen metering ratio of the fuel cell system provided in the embodiment of the present application may be executed by a device for determining the hydrogen metering ratio of the fuel cell system. In the embodiment of the present application, the method for determining the hydrogen gas stoichiometric ratio of the fuel cell system executed by the device for determining the hydrogen gas stoichiometric ratio of the fuel cell system is taken as an example to illustrate the device for determining the hydrogen gas stoichiometric ratio of the fuel cell system provided in the embodiment of the present application.

The embodiment of the present application also provides a device for determining the metering ratio of hydrogen in a fuel cell system.

As shown in Figure 4, the device for determining the hydrogen metering ratio of the fuel cell system includes:

The obtaining module 410 is used to obtain the inlet temperature, inlet pressure and outlet pressure of the hydrogen circulation device 80 of the fuel cell system, and obtain the stack current of the fuel cell stack 50 of the fuel cell system;

The first processing module 420 is used to determine the gas state influencing factor of the fuel cell system based on the inlet temperature, inlet pressure and outlet pressure;

The second processing module 430 is used to determine the hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, the inlet pressure, the gas state influencing factor and the gas utilization rate of the fuel cell system, and the gas utilization rate is determined based on the operating conditions of the fuel cell system;

The third processing module 440 is used to determine the hydrogen consumption of the fuel cell system based on the stack current;

The fourth processing module 450 is configured to determine the hydrogen metering ratio of the fuel cell system based on the hydrogen circulation flow rate and the hydrogen consumption.

According to the hydrogen metering ratio determination device of the fuel cell system provided in the embodiment of the present application, the hydrogen circulation flow rate is calculated by measuring the temperature and pressure data at the inlet and outlet of the hydrogen circulation device 80, and the hydrogen metering ratio is determined in combination with the hydrogen consumption, and the response speed is fast , the accuracy of the calculation result is high, and there is no need to change the pipeline structure of the fuel cell system, which can effectively reduce the system cost.

In some embodiments, the first processing module 420 is used to determine the water vapor volume fraction at the inlet of the hydrogen circulation device 80 based on the inlet temperature and the inlet pressure;

Determine the pressure difference between the inlet and outlet of the hydrogen circulation device 80 based on the inlet pressure and the outlet pressure;

Based on the inlet pressure, inlet and outlet pressure difference, inlet temperature and water vapor volume fraction, the gas state influencing factor is determined.

In some embodiments, the first processing module 420 is used to determine the saturated vapor pressure corresponding to the inlet temperature based on the inlet temperature;

Based on the inlet pressure and saturation vapor pressure, the water vapor volume fraction is determined.

In some embodiments, the second processing module 430 is used to determine the outlet hydrogen flow rate of the hydrogen circulation device 80 based on the gas state influencing factor and the gas utilization rate;

Based on the inlet temperature and the inlet pressure, determine the water vapor volume fraction at the inlet of the hydrogen circulation device 80;

Based on the outlet hydrogen flow rate and the water vapor volume fraction, the hydrogen circulation flow rate is determined.

In some embodiments, the second processing module 430 is used to determine the outlet hydrogen flow rate of the hydrogen circulation device 80 based on the gas state influencing factor and the gas utilization rate, including:

Apply the formula

Q=K*η*λ*n

Determine the outlet hydrogen flow;

Wherein, Q is the outlet hydrogen flow rate, K is the volume of the hydrogen circulation device 80, n is the gas utilization rate, λ is the gas state influencing factor, and n is the rotating speed of the hydrogen circulation device 80.

In some embodiments, the fourth processing module 450 is also used to convert the hydrogen circulation flow into the standard condition according to the ideal gas state equation before determining the hydrogen metering ratio of the fuel cell system based on the hydrogen circulation flow and the hydrogen consumption. Hydrogen circulation flow.

The device for determining the hydrogen gas metering ratio of the fuel cell system in the embodiment of the present application may be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or other devices other than the terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a notebook computer, a handheld computer, a vehicle electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/virtual reality (virtual reality, VR) ) equipment, robots, wearable devices, ultra-mobile personal computer (ultra-mobile personal computer, UMPC), netbook or personal digital assistant (personal digital assistant, PDA), etc., can also serve as server, network attached storage (Network Attached Storage, NAS ), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., are not specifically limited in this embodiment of the present application.

The device for determining the hydrogen gas metering ratio of the fuel cell system in the embodiment of the present application may be a device with an operating system. The operating system may be an Android operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in this embodiment of the present application.

The device for determining the hydrogen gas metering ratio of the fuel cell system provided by the embodiment of the present application can realize various processes realized by the method embodiments in FIG. 1 to FIG. 3 , and details are not repeated here to avoid repetition.

The embodiment of the present application also provides a fuel cell system, including:

As shown in FIG. 2 , the fuel cell system includes a hydrogen source 10 , a gas-water separator 60 , a hydrogen circulation device 80 , a fuel cell stack 50 and a controller.

Wherein, the hydrogen source 10 is connected to the first inlet of the gas-water separator 60. The gas-water separator 60 can be an integrated gas-water separator with integrated preheater function, which can separate gas and liquid and preheat the gas.

The inlet of the hydrogen circulation device 80 is connected with the first outlet of the gas-water separator 60, the inlet of the hydrogen circulation device 80 is provided with a temperature and pressure sensor 70, and the outlet of the hydrogen circulation device 80 is provided with a pressure sensor 90, and the temperature and pressure sensor 70 is used for collecting The inlet temperature and inlet pressure of the hydrogen circulation device 80 , and the pressure sensor 90 is used to collect the outlet pressure of the hydrogen circulation device 80 .

In actual implementation, the temperature and pressure sensor 70 may be two separate sensors, or a two-in-one sensor; the hydrogen circulation device 80 may be a circulation pump.

The fuel cell stack 50 is connected to the outlet of the hydrogen circulation device 80 , and the negative electrode of the fuel cell stack 50 is provided with a current sensor, and the current sensor is used to collect the stack current.

The controller is electrically connected with the hydrogen circulation device 80 , the temperature and pressure sensor 70 , the pressure sensor 90 and the current sensor, and is used to determine the hydrogen metering ratio of the fuel cell system based on the method for determining the hydrogen metering ratio of the fuel cell system.

In this embodiment, only the temperature and pressure sensor 70 and the pressure sensor 90 are installed in the hydrogen circulation device 80 to realize the calculation of the hydrogen metering ratio of the fuel cell system.

According to the fuel cell system provided in the embodiment of the present application, by setting the temperature and pressure sensor 70 and the pressure sensor 90, measuring the temperature and pressure data at the inlet and outlet of the hydrogen circulation device 80, calculating the hydrogen circulation flow rate, and determining the hydrogen metering ratio in combination with the hydrogen consumption , fast response, high accuracy of calculation results, no need to change the pipeline structure of the fuel cell system, and can effectively reduce the system cost.

A specific embodiment is introduced below.

The inlet temperature T of the hydrogen circulation device 80 is collected by the temperature and pressure sensor 70 .

According to the inlet temperature T collected by the temperature and pressure sensor 70, the saturated vapor pressure P1 of water at this temperature is obtained by looking up a table or calculating.

The temperature and pressure sensor 70 also collects the inlet pressure P2 of the hydrogen circulation device 80 .

According to the saturated vapor pressure P1 and the inlet pressure P2, the volume fraction of water vapor in the loop of the hydrogen circulation device 80 is calculated ɑ=P1/P2.

The outlet pressure P3 of the hydrogen circulation device 80 is collected by a pressure sensor 90 .

Calculate the inlet and outlet pressure difference ΔP=P3−P2 of the hydrogen circulation device 80 .

According to the current operating condition of the fuel cell stack 50, the gas utilization ratio η is obtained.

According to the inlet and outlet pressure difference ΔP, water vapor volume fraction α, inlet pressure P2 and inlet temperature T, check the table to read the gas state influence factor λ.

The rotational speed n fed back by the hydrogen circulation device 80 is read.

Calculate the outlet hydrogen flow rate Q=K*η*λ*n of the hydrogen circulation device 80 , where K is the volume of the hydrogen circulation device 80 .

According to the water vapor volume fraction ɑ, the outlet hydrogen flow rate Q1 is corrected, where Q1 = Q*(1-ɑ).

According to the ideal gas state equation Pa*Va/Ta=Pb*Vb/Tb, Q1 is converted into the hydrogen circulation flow Q2 under the standard condition, Q2=P2*Ta*Q1/(T*Pa), wherein, Pa, Ta is the pressure and temperature under standard conditions.

Acquire the current I of the current sensor of the fuel cell stack 50, calculate the hydrogen consumption Q3, and calculate the hydrogen metering ratio S=(Q2+Q3)/Q3 of the fuel cell system.

In this embodiment, by setting the temperature and pressure sensor 70 and the pressure sensor 90, the accurate measurement of the hydrogen gas circulation flow rate and the hydrogen gas metering ratio is realized, and the system structure is simple, the cost is low, and the practicability is strong.

In some embodiments, the fuel cell system may further include a first on-off valve 41 and a second on-off valve 42 electrically connected to the controller, the first on-off valve 41 is arranged between the hydrogen source 10 and the first inlet, and the second on-off valve The valve 42 is disposed between the hydrogen source 10 and the fuel cell stack 50 .

In this embodiment, the first switch valve 41 is used to control the amount of hydrogen input from the hydrogen source 10 into the gas-water separator 60, and the second switch valve 42 is used to control the amount of hydrogen input from the hydrogen source 10 to the fuel cell stack 50. .

The hydrogen passing through the first switching valve 41 first enters the gas-water separator 60, then enters the hydrogen circulation device 80, and then enters the fuel cell stack 50. The gas-water separator 60 can play the role of preheating and separating gas and liquid; The hydrogen gas from the second switching valve 42 directly enters the fuel cell stack 50 .

In actual implementation, both the first on-off valve 41 and the second on-off valve 42 are electromagnetic on-off valves, which are opened and closed under the control of the controller. The role of hydrogen preheating and humidity regulation of the battery cell stack 50.

In this embodiment, the gas-water separator 60 can preheat the gas, and by controlling the first on-off valve 41 and the second on-off valve 42 , the inlet temperature of the hydrogen circulation device 80 is controlled to be greater than or equal to the first temperature threshold.

When the inlet temperature is lower than the first temperature threshold, the first on-off valve 41 is opened, the second on-off valve 42 is closed, and the temperature and humidity at the inlet of the hydrogen circulation device 80 are increased.

When the inlet temperature is greater than or equal to the first temperature threshold, the second on-off valve 42 is opened, the first on-off valve 41 is closed, and the residual heat of the integrated gas-water separator 60 is used to preheat the hydrogen and adjust the humidity of the hydrogen.

The hydrogen with a lower drying temperature is preheated by the gas-water separator 60 to the temperature at which the hydrogen enters the stack. At this time, the temperature of the circulating hydrogen in the gas-water separator 60 is lowered, so that more liquid water is separated into the water separator, which can Realize the control of the humidity of hydrogen into the stack.

In this embodiment, through the control of the first on-off valve 41 and the second on-off valve 42 , the preheating of the dry hydrogen and the adjustment of the humidity of the hydrogen circulation loop are realized.

In some embodiments, a pressure reducing valve 20 and a proportional pressure regulating valve 30 are sequentially provided between the hydrogen source 10 and the gas-water separator 60 .

The pressure reducing valve 20 is a valve that reduces the inlet pressure to a certain required outlet pressure through adjustment, and relies on the energy of the medium itself to keep the outlet pressure automatically stable.

The proportional pressure regulating valve 30 belongs to the control valve series, and its main function is to adjust the parameters such as the pressure, flow rate and temperature of the medium.

In some embodiments, as shown in FIG. 5 , the embodiment of the present application also provides an electronic device 500, including a processor 501, a memory 502, and a computer program stored in the memory 502 and operable on the processor 501. When the program is executed by the processor 501 , each process of the above embodiment of the method for determining the hydrogen gas metering ratio of the fuel cell system can be realized, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

It should be noted that the electronic devices in the embodiments of the present application include the above-mentioned mobile electronic devices and non-mobile electronic devices.

The embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the hydrogen metering ratio determination of the above-mentioned fuel cell system is realized. Each process of the method embodiment can achieve the same technical effect, and will not be repeated here to avoid repetition.

Wherein, the processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk, and the like.

An embodiment of the present application further provides a computer program product, including a computer program, and when the computer program is executed by a processor, the above-mentioned method for determining the hydrogen metering ratio of the fuel cell system is implemented.

Wherein, the processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk, and the like.

The embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to realize the hydrogen metering of the above-mentioned fuel cell system The various processes in the embodiment of the method are compared and can achieve the same technical effect, so in order to avoid repetition, details are not repeated here.

It should be understood that the chips mentioned in the embodiments of the present application may also be called system-on-chip, system-on-chip, system-on-a-chip, or system-on-a-chip.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic disk, etc.) , optical disc), including several instructions to enable a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the application is defined by the claims and their equivalents.

Claims (8)

1. A method for determining the hydrogen metering ratio of a fuel cell system, comprising: Obtain the inlet temperature, inlet pressure and outlet pressure of the hydrogen circulation device of the fuel cell system, and obtain the stack current of the fuel cell stack of the fuel cell system; determining a gas state influencing factor of the fuel cell system based on the inlet temperature, the inlet pressure, and the outlet pressure; Determine the hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, the inlet pressure, the gas state influencing factor and the gas utilization rate of the fuel cell system, the gas utilization rate is based on the fuel cell system Determination of operating conditions; determining the hydrogen consumption of the fuel cell system based on the stack current; determining a hydrogen metering ratio of the fuel cell system based on the hydrogen circulation flow rate and the hydrogen consumption; The determining the hydrogen circulation flow rate of the fuel cell system based on the inlet temperature, the inlet pressure, the gas state influencing factor and the gas utilization rate of the fuel cell system includes: Based on the gas state influencing factor and the gas utilization rate, determine the outlet hydrogen flow rate of the hydrogen circulation device; Based on the inlet temperature and the inlet pressure, determining the water vapor volume fraction at the inlet of the hydrogen circulation device; Based on the outlet hydrogen flow rate and the water vapor volume fraction, determine the hydrogen circulation flow rate; The determination of the outlet hydrogen flow rate of the hydrogen circulation device based on the gas state influencing factor and the gas utilization rate includes: Apply the formula Q=K*η*λ*n Determine the outlet hydrogen flow; Wherein, Q is the hydrogen flow rate at the outlet, K is the volume of the hydrogen circulation device, n is the gas utilization rate, λ is the gas state influencing factor, and n is the speed of the hydrogen circulation device. 2. The method for determining the stoichiometric ratio of hydrogen in a fuel cell system according to claim 1, wherein the gas state of the fuel cell system is determined based on the inlet temperature, the inlet pressure and the outlet pressure Impact factors, including: Based on the inlet temperature and the inlet pressure, determining the water vapor volume fraction at the inlet of the hydrogen circulation device; determining the pressure difference between the inlet and outlet of the hydrogen circulation device based on the inlet pressure and the outlet pressure; The gas state influencing factor is determined based on the inlet pressure, the inlet and outlet pressure difference, the inlet temperature and the water vapor volume fraction. 3. The method for determining the stoichiometric ratio of hydrogen in a fuel cell system according to claim 2, wherein the determination of the water vapor volume fraction at the inlet of the hydrogen circulation device based on the inlet temperature and the inlet pressure includes: : Based on the inlet temperature, determining the saturated vapor pressure corresponding to the inlet temperature; Based on the inlet pressure and the saturation vapor pressure, the water vapor volume fraction is determined. 4. The method for determining the stoichiometric ratio of hydrogen in a fuel cell system according to any one of claims 1-3, wherein, based on the inlet temperature, the inlet pressure, the gas state influencing factor and the The gas utilization rate of the fuel cell system, after determining the hydrogen circulation flow rate of the fuel cell system, before determining the hydrogen metering ratio of the fuel cell system based on the hydrogen circulation flow rate and the hydrogen consumption, the The method also includes: According to the ideal gas state equation, the hydrogen circulation flow rate is converted into the hydrogen circulation flow rate under standard conditions. 5. A fuel cell system, characterized in that it comprises: Hydrogen source; A gas-water separator, the hydrogen source is connected to the first inlet of the gas-water separator; A hydrogen circulation device, the inlet of the hydrogen circulation device is connected to the first outlet of the gas-water separator, the inlet of the hydrogen circulation device is provided with a temperature and pressure sensor, and the outlet of the hydrogen circulation device is provided with a pressure sensor, so The temperature and pressure sensor is used to collect the inlet temperature and inlet pressure of the hydrogen circulation device, and the pressure sensor is used to collect the outlet pressure of the hydrogen circulation device; A fuel cell stack, the fuel cell stack is connected to the outlet of the hydrogen circulation device, and the stack negative electrode of the fuel cell stack is provided with a current sensor, and the current sensor is used to collect the stack current; A controller, the controller is electrically connected with the hydrogen circulation device, the temperature and pressure sensor, the pressure sensor and the current sensor, and is used for the fuel cell system based on any one of claims 1-4. The hydrogen metering ratio determination method is to determine the hydrogen metering ratio of the fuel cell system. 6. The fuel cell system according to claim 5, further comprising a first on-off valve and a second on-off valve electrically connected to the controller, the first on-off valve is arranged between the hydrogen source and the Between the first inlets, the second switch valve is arranged between the hydrogen source and the fuel cell stack. 7. The fuel cell system according to claim 5 or 6, characterized in that a pressure reducing valve and a proportional pressure regulating valve are sequentially provided between the hydrogen source and the gas-water separator. 8. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor implements any of claims 1-4 when executing the program. The method for determining the hydrogen metering ratio of the fuel cell system described in the item.

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