Gas supply pipeline design method and related equipment for fuel cell cathode gas supply system

Abstract

The present application discloses a method for designing an air supply pipeline of a cathode air supply system of a fuel cell and related equipment, the method comprising: obtaining a design flow rate of air entering the stack and an air mass flow rate discharged by an air compressor; calculating an assumed total volume of the cathode air supply pipeline based on assumed geometric parameters of the pipeline; obtaining a cathode air intake pipeline pressure and a gas temperature in the cathode air intake pipeline; calculating an actual air mass flow rate discharged by the cathode air intake pipeline based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged by the air compressor and other reference parameters; determining a flow difference between the actual air mass flow rate and the design flow rate of air entering the stack; when the flow difference is greater than a preset difference, adjusting the assumed geometric parameters of the pipeline so that the flow difference is less than or equal to the preset difference; determining the assumed geometric parameters of the pipeline corresponding to the flow difference being less than or equal to the preset difference as the target geometric parameters of the pipeline.

Description

Technical Field

[0001] The present specification relates to the field of fuel cells, and more specifically, the present application relates to a gas supply pipeline design method and related equipment for a cathode gas supply system of a fuel cell. Background Art

[0002] In traditional cathode gas supply system design, 3D simulation technology is often used to ensure that the pipeline design can meet the accuracy and effectiveness of gas supply requirements. This method can accurately predict the performance of the pipeline system in actual operation by simulating the airflow dynamics, pressure distribution and temperature changes in detail, thereby helping engineers optimize the design and avoid possible design defects such as airflow blockage, excessive pressure loss or unstable airflow supply.

[0003] 3D simulation usually requires high-performance computing resources, high requirements for computer hardware, time-consuming calculation process, and increased design cycle and cost. The accuracy of the model is highly dependent on the accuracy of the input parameters. For example, the deviation between the actual operating conditions and the simulation conditions may cause the simulation results to be inconsistent with the actual operating performance. For fine-tuning or rapid iteration of system design, traditional 3D simulation methods may not be flexible enough, and re-modeling and simulation often consumes a lot of time and resources. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In a first aspect, the present application proposes a method for designing a gas supply pipeline of a cathode gas supply system of a fuel cell, comprising:

[0006] Obtain the design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor;

[0007] Calculate the assumed total volume of the cathode gas supply pipeline based on the assumed geometric parameters of the pipeline;

[0008] Obtaining the cathode air inlet pipeline pressure and the gas temperature in the cathode air inlet pipeline;

[0009] Calculate the actual air mass flow rate discharged from the cathode air intake pipeline based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor and other reference parameters;

[0010] Determine the flow difference between the actual air mass flow and the designed flow of air into the stack;

[0011] When the flow difference is greater than the preset difference, adjusting the assumed geometric parameters of the pipeline so that the flow difference is less than or equal to the preset difference;

[0012] The assumed pipeline geometric parameters corresponding to the above flow difference being less than or equal to the preset difference are determined as pipeline target geometric parameters.

[0013] In a feasible implementation manner, the above-mentioned design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor are determined based on the selection of components, and the above-mentioned geometric parameters include pipe length, pipe diameter, elbow outer diameter, elbow wall thickness and the distance from the center of the elbow section to the center of the annulus.

[0014] In a feasible implementation manner, the above-mentioned calculation of the assumed total volume of the cathode gas supply pipeline based on the assumed geometric parameters of the pipeline includes:

[0015] The assumed total volume of the cathode gas supply line mentioned above is calculated based on the following formula:

[0016]

[0017] in, is the diameter of the i-th section of the pipeline, L i is the length of the i-th pipeline, r i is the distance from the center of the i-th elbow section to the center of the torus, S i is the wall thickness of the first elbow, D i is the outer diameter of the i-th elbow.

[0018] In a feasible implementation manner, the above-mentioned obtaining of the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline includes:

[0019] Obtain the air compressor pressure ratio and the atmospheric pressure of the fuel cell stack operating environment;

[0020] Determine the cathode air intake pipeline pressure based on the air compressor pressure ratio and the atmospheric pressure of the fuel cell stack operating environment;

[0021] Obtain the operating environment temperature of the fuel cell stack, the efficiency of the air compressor and the specific heat capacity of the gas under normal pressure;

[0022] The gas temperature in the cathode air intake pipe is calculated based on the operating environment temperature of the fuel cell stack, the air compressor efficiency and the specific heat capacity of the gas under the normal pressure conditions.

[0023] In a feasible implementation manner, the cathode air intake pipeline pressure is determined based on the air compressor pressure ratio and the atmospheric pressure of the stack operating environment, including:

[0024] The cathode air intake pipe pressure P is calculated based on the following formula sm :

[0025]

[0026] Wherein, P is the air compressor pressure ratio, is the atmospheric pressure of the operating environment of the above-mentioned fuel cell stack.

[0027] In a feasible implementation manner, the gas temperature in the cathode air intake pipe is calculated based on the operating environment temperature of the fuel cell stack, the air compressor efficiency and the specific heat capacity of the gas under the normal pressure condition, including:

[0028] The gas temperature in the cathode inlet pipe is calculated based on the following formula:

[0029]

[0030] in, is the operating environment temperature of the above stack, For the above air compressor efficiency, is the specific heat capacity of the gas under the above normal pressure conditions.

[0031] In a feasible implementation manner, the actual air mass flow rate discharged from the cathode air intake pipeline is calculated based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor and other reference parameters, including:

[0032] The actual air mass flow rate discharged from the cathode air intake duct is calculated based on the following formula :

[0033]

[0034] in, is the molar mass of air, R is the ideal gas constant, is the cathode air intake pipe pressure, is the gas temperature in the above-mentioned inlet duct, Assuming a total volume for the cathode gas supply line above, is the air mass flow rate discharged from the above air compressor.

[0035] In a second aspect, the present application proposes a gas supply pipeline design device for a fuel cell cathode gas supply system, comprising:

[0036] A first acquisition unit is used to acquire the design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor;

[0037] A first calculation unit, used for calculating an assumed total volume of the cathode gas supply pipeline based on assumed geometric parameters of the pipeline;

[0038] A second acquisition unit, used to acquire the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline;

[0039] The second calculation unit is used to calculate the cathode intake air flow rate based on the cathode intake air pipeline pressure, the gas temperature in the cathode intake air pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged by the air compressor and other reference parameters.

[0040] The actual air mass flow rate discharged from the duct;

[0041] A determination unit, used for determining a flow difference between the actual air mass flow and the designed flow of air entering the stack;

[0042] An adjusting unit, used for adjusting the assumed geometric parameters of the pipeline when the flow difference is greater than the preset difference, so that the flow difference is less than or equal to the preset difference;

[0043] The determination unit is used to determine the pipeline assumed geometric parameters corresponding to the above-mentioned flow difference value when the above-mentioned flow difference value is less than or equal to the preset difference value as the pipeline target geometric parameters.

[0044] In a third aspect, an electronic device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the steps of a method for designing a gas supply pipeline for a cathode gas supply system of a fuel cell as described in any one of the first aspects above when executing the computer program stored in the memory.

[0045] In a fourth aspect, the present application further proposes a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for designing a gas supply pipeline for a cathode gas supply system of a fuel cell according to any one of the first aspects is implemented.

[0046] In summary, the method proposed in the present application includes: obtaining the design flow rate of air entering the stack and the air mass flow rate discharged by the air compressor; calculating the assumed total volume of the cathode air supply pipeline based on the assumed geometric parameters of the pipeline; obtaining the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline; calculating the actual air mass flow rate discharged from the cathode air intake pipeline based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged by the air compressor and other reference parameters; judging the flow difference between the actual air mass flow rate and the design flow rate of the air entering the stack; when the flow difference is greater than the preset difference, adjusting the assumed geometric parameters of the pipeline so that the flow difference is less than or equal to the preset difference; determining the assumed geometric parameters of the pipeline corresponding to the flow difference being less than or equal to the preset difference as the target geometric parameters of the pipeline. Compared with the traditional three-dimensional simulation method, the optimization design method of the present invention can quickly meet the design requirements by directly adjusting the geometric parameters of the pipeline, without the need to re-perform complex three-dimensional modeling and simulation for each system, which greatly shortens the design cycle. It reduces the dependence on advanced simulation software and professional operators and reduces the design cost. Through the actual adjustment of pipeline parameters, the actual production line can be directly optimized, which improves the practicality and operability of the method. This method allows the pipeline design to be dynamically adjusted according to the actual measurement results, which enhances the adaptability and flexibility of the design, especially in application environments where field conditions change frequently. This method can effectively achieve fast, economical and efficient pipeline design to adapt to rapidly changing industrial needs, especially in rapidly developing fields such as fuel cell technology, and has important practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0048] Figure 1 A schematic diagram of a flow chart of a method for designing a gas supply pipeline for a cathode gas supply system of a fuel cell provided in an embodiment of the present application;

[0049] Figure 2 A structural schematic diagram of a fuel cell cathode gas supply system provided in an embodiment of the present application;

[0050] Figure 3 A schematic diagram of the structure of a gas supply pipeline design device for a fuel cell cathode gas supply system provided in an embodiment of the present application;

[0051] Figure 4A schematic diagram of the structure of an electronic device for designing a gas supply pipeline for a cathode gas supply system of a fuel cell provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0053] Figure 2 A possible cathode air supply system with energy recovery from an expander is provided, which is mainly composed of an air filter 1, an air compressor 2 with an expander, a humidifier 3, an intercooler 4, a fuel cell stack 5, a water-gas separator 6, a back pressure valve 7 and a mixed row 8. They work in coordination to provide oxygen with suitable temperature, humidity, flow rate and pressure to enter the stack for reaction. Natural air is clean and pollution-free after passing through the air filter. The high-temperature air compressed by the air compressor is cooled and humidified by the humidifying intercooler. The water in the humidifier comes from the cooling system. On the one hand, it humidifies the air, and on the other hand, it can cool the air. In order to save space and reduce costs, the present invention adopts a humidifying intercooler. After the humidified and cooled air enters the stack to participate in the reaction, the tail gas contains water droplets. It is necessary to take appropriate measures to reduce the droplets and water content in the tail discharge. Therefore, a water-gas separator is placed at the outlet of the stack, and finally the tail gas is discharged after passing through the back pressure valve.

[0054] See also Figure 1 , which is a schematic flow diagram of a method for designing a gas supply pipeline for a cathode gas supply system of a fuel cell provided in an embodiment of the present application, and may specifically include:

[0055] S110, obtaining the design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor;

[0056] For example, the air flow rate (design flow rate) required by the design of the fuel cell stack and the actual air mass flow rate that the air compressor can provide are measured or calculated.

[0057] S120, calculating the assumed total volume of the cathode gas supply pipeline based on the assumed geometric parameters of the pipeline;

[0058] Exemplarily, based on the assumed dimensions of the pipeline (such as pipe diameter, length, bends, etc.), the total volume of the pipeline is calculated, which is important for understanding the air storage and pressure loss in the pipeline.

[0059] S130, obtaining the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline;

[0060] Exemplarily, the actual pressure and temperature in the cathode inlet duct are calculated or measured, as these parameters are key factors in evaluating duct performance and design optimization.

[0061] S140, calculating the actual air mass flow rate discharged from the cathode air intake pipeline based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor and other reference parameters;

[0062] Exemplarily, cathode inlet duct pressure is the gas pressure measured in the cathode inlet duct. Gas temperature in the cathode inlet duct. The temperature of the gas has a significant effect on its density. The increase in temperature causes the gas to expand and the density to decrease, which directly affects the gas mass per unit volume. The assumed total volume of the cathode supply line refers to the total volume of the space in the supply line. It is related to the geometric parameters of the pipeline, such as length and diameter. The total volume is an important basis for calculating the total mass of gas in the pipeline. The mass flow rate of air discharged by the air compressor is the mass of air that the air compressor can provide, usually quantified in time units (such as per minute or per hour). This indicates how much gas the system can supply and is an important parameter for design and performance evaluation.

[0063] S150, determining the flow difference between the actual air mass flow and the designed flow of air entering the stack;

[0064] For example, the difference between the actual air flow rate and the designed air flow rate into the stack is compared to see whether the design requirements are met.

[0065] S160, when the flow difference is greater than the preset difference, adjusting the assumed geometric parameters of the pipeline so that the flow difference is less than or equal to the preset difference;

[0066] For example, if the difference between the actual flow rate and the designed flow rate is too large, it is necessary to adjust the geometric parameters of the pipeline (such as diameter, length, or the number and angle of elbows) to meet the design standards.

[0067] S170. Determine the assumed pipeline geometric parameters corresponding to the flow difference being less than or equal to the preset difference as pipeline target geometric parameters.

[0068] For example, if the difference between the actual flow rate and the designed flow rate is too large, it is necessary to adjust the geometric parameters of the pipeline (such as diameter, length, or the number and angle of elbows) to meet the design standards.

[0069] In summary, compared with the traditional three-dimensional simulation method, the optimization design method of the present invention can quickly meet the design requirements by directly adjusting the geometric parameters of the pipeline, without the need to re-perform complex three-dimensional modeling and simulation for each system, which greatly shortens the design cycle. It reduces the dependence on advanced simulation software and professional operators and reduces the design cost. Through the actual adjustment of pipeline parameters, the actual production line can be directly optimized, which improves the practicality and operability of the method. This method allows the pipeline design to be dynamically adjusted according to the actual measurement results, enhances the adaptability and flexibility of the design, and is particularly advantageous in application environments where field conditions frequently change. Through this method, fast, economical and efficient pipeline design can be effectively achieved to adapt to rapidly changing industrial needs, especially in rapidly developing fields such as fuel cell technology, and has important practical application value.

[0070] In some examples, the design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor are determined based on component selection, and the geometric parameters include pipe length, pipe diameter, elbow outer diameter, elbow wall thickness, and the distance from the center of the elbow section to the center of the annulus.

[0071] For example, the design flow rate of air into the stack refers to the air flow rate required by the fuel cell stack, which is pre-set according to the working requirements and optimal performance parameters of the stack. The design flow rate must meet the oxygen demand of the stack when it is operating at maximum efficiency. The mass flow rate of air removed by the air compressor refers to the mass of air that the air compressor can provide per unit time. This parameter is usually determined during the selection process, based on the performance specifications of the air compressor to ensure that it can provide enough air to meet the design flow requirements.

[0072] Geometric parameters are used to describe the physical characteristics of the pipeline, including:

[0073] Pipe length: The actual length of the pipeline, which affects the pressure loss and flow characteristics of the pipeline.

[0074] Pipe diameter: The inner diameter of the pipe directly affects the flow rate of the airflow and the flow resistance of the pipe.

[0075] Elbow OD: The outside diameter of the elbow portion, which is related to the overall size and fluid dynamics of the pipe.

[0076] Elbow wall thickness: The material thickness of the elbow part affects the structural strength and pressure resistance of the pipeline.

[0077] Distance from the center of the elbow section to the center of the torus: This is a parameter that describes the geometry of the elbow, which refers to the distance from the center point of the elbow to the center of the elbow's curvature radius. This distance is critical for calculating the extent to which the elbow affects the airflow.

[0078] In some examples, the above-mentioned calculation of the assumed total volume of the cathode gas supply pipeline based on the assumed geometric parameters of the pipeline includes:

[0079] The assumed total volume of the cathode gas supply line mentioned above is calculated based on the following formula:

[0080]

[0081] in, is the diameter of the i-th section of the pipeline, L i is the length of the i-th pipeline, r i is the distance from the center of the i-th elbow section to the center of the torus, S i is the wall thickness of the first elbow, D i is the outer diameter of the ith elbow. Based on the above formula, the pipe volume under different configurations can be accurately calculated.

[0082] In some examples, the above-mentioned obtaining the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline includes:

[0083] Obtain the air compressor pressure ratio and the atmospheric pressure of the fuel cell stack operating environment;

[0084] Determine the cathode air intake pipeline pressure based on the air compressor pressure ratio and the atmospheric pressure of the fuel cell stack operating environment;

[0085] Obtain the operating environment temperature of the fuel cell stack, the efficiency of the air compressor and the specific heat capacity of the gas under normal pressure;

[0086] The gas temperature in the cathode air intake pipe is calculated based on the operating environment temperature of the fuel cell stack, the air compressor efficiency and the specific heat capacity of the gas under the normal pressure conditions.

[0087] Exemplarily, the air compressor pressure ratio is the ratio of the air compressor output pressure to its input pressure (usually atmospheric pressure). The pressure ratio is a key parameter for evaluating compressor performance and directly affects the pressure level of the compressed gas.

[0088] The atmospheric pressure of the fuel cell stack operating environment refers to the atmospheric pressure of the environment in which the fuel cell stack is located. In different geographical locations and under different weather conditions, the atmospheric pressure may be different, which has a direct impact on the actual pressure output by the compressor.

[0089] The gas pressure in the cathode air intake pipe can be calculated by multiplying the pressure ratio of the air compressor and the atmospheric pressure of the fuel cell operating environment. This pressure is the pressure before the compressed gas enters the fuel cell stack, which has a key impact on the performance of the fuel cell stack.

[0090] Fuel cell operating environment temperature: refers to the temperature of the environment in which the fuel cell is located. The ambient temperature will affect the temperature of the gas entering the fuel cell, which in turn affects the operating efficiency and life of the fuel cell.

[0091] Air compressor efficiency: This is a parameter to evaluate the performance of the compressor, which refers to the efficiency of the compressor in converting energy. The higher the compressor efficiency, the lower the energy loss.

[0092] Specific heat capacity of gas under normal pressure: Specific heat capacity refers to the amount of heat required to raise a unit mass of gas by 1 degree at normal pressure. This parameter is crucial for calculating the energy change during heating or cooling of gas.

[0093] Using the temperature of the stack operating environment as a basis, taking into account the efficiency of the air compressor and the specific heat capacity of the gas, the temperature change of the gas during the compression process can be estimated. Generally, compressing the gas will cause the temperature to rise, and the extent of this increase depends on the efficiency of the compressor and the specific heat capacity of the gas.

[0094] This process not only ensures that the gas has the right pressure and temperature before being fed into the fuel cell stack, but also helps optimize the overall operating efficiency and stability of the fuel cell stack. In this way, key operating parameters of the fuel cell stack system can be effectively managed and controlled.

[0095] In some examples, determining the cathode air intake pipe pressure based on the air compressor pressure ratio and the atmospheric pressure of the stack operating environment includes:

[0096] The cathode air intake pipe pressure P is calculated based on the following formula sm :

[0097]

[0098] Wherein, P is the air compressor pressure ratio, is the atmospheric pressure of the operating environment of the above-mentioned fuel cell stack.

[0099] For example, the atmospheric pressure P of the environment in which the stack is located is first determined. atm This data can be obtained from meteorological data or measured directly on site using a pressure gauge. The pressure ratio P of an air compressor is usually given in the compressor's technical specifications and indicates the multiple to which the compressor compresses the input air when it is running. Using the formula P sm =P⋅P atmCalculate the actual pressure in the cathode air intake pipe. This pressure is the actual air pressure entering the fuel cell stack after being processed by the compressor, which directly affects the oxygen supply and overall reaction efficiency of the fuel cell stack.

[0100] In some examples, the gas temperature in the cathode air intake pipe is calculated based on the operating environment temperature of the fuel cell stack, the air compressor efficiency and the specific heat capacity of the gas under the normal pressure condition, including:

[0101] The gas temperature in the cathode inlet pipe is calculated based on the following formula:

[0102]

[0103] in, is the operating environment temperature of the above stack, For the above air compressor efficiency, is the specific heat capacity of the gas under the above normal pressure conditions.

[0104] For example, when air is compressed, the temperature of the gas increases because the energy of the gas molecules increases (work is done on the gas). The increase in temperature can be determined by the gas's specific heat ratio y and pressure ratio P sm / P atm To estimate.

[0105] In the formula The theoretical effect of pressure change on temperature is partially calculated, taking into account the ratio of specific heats of gases.

[0106] The actual temperature change also needs to take into account the efficiency of the compressor. cmp A less efficient compressor may convert more of its energy into heat rather than doing effective compression work, resulting in a higher temperature increase. cmp It indicates the regulating effect of efficiency on temperature change. Low efficiency will lead to higher temperature rise. Through this calculation, designers can effectively and accurately obtain the temperature in the gas supply system, providing a reasonable basis for pipeline design.

[0107] In some examples, the actual air mass flow rate discharged from the cathode air intake pipeline is calculated based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor, and other reference parameters, including:

[0108] The actual air mass flow rate discharged from the cathode air intake duct is calculated based on the following formula :

[0109]

[0110] in, is the molar mass of air, R is the ideal gas constant, is the cathode air intake pipe pressure, is the gas temperature in the above-mentioned inlet duct, Assuming a total volume for the cathode gas supply line above, is the air mass flow rate discharged from the above air compressor.

[0111] For example, The pressure change rate indicates how fast the pressure in the system changes over time.

[0112] R is the gas constant, a physical constant used to calculate the gas state equation.

[0113] T sm is the gas temperature in the system.

[0114] M air is the molar mass of air and is used to relate the gas constant to a specific gas (here, air).

[0115] V sm The above assumes a total volume for the cathode gas supply line.

[0116] It is the air mass flow rate discharged by the above air compressor, and the unit is usually mol / s or similar units.

[0117] The formula calculates the rate of change of pressure by balancing the amount of gas entering and leaving the system. If more gas is flowing in than is flowing out, the pressure will rise; if less gas is flowing in than is flowing out, the pressure will fall.

[0118] In summary, the method proposed in the present application can accurately design the length, diameter and other parameters of the gas supply pipeline during the design stage through the fuel cell cathode gas supply system pipeline optimization design method, so that the actual flow rate of the cathode gas supply system is consistent with the designed flow rate. The present application provides an air compressor system architecture with an expander, which utilizes the energy recovery of the expander to reduce the power consumption of the air compressor and effectively improve the system efficiency; this method reduces the time and complexity of the cathode gas supply system pipeline design, and is of great significance for improving the performance, reducing costs and increasing efficiency of the cathode gas supply system.

[0119] like Figure 3 As shown, the present application proposes a gas supply pipeline design device for a fuel cell cathode gas supply system, comprising:

[0120] A first acquisition unit 21 is used to acquire the design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor;

[0121] A first calculation unit 22, used to calculate an assumed total volume of the cathode gas supply pipeline based on assumed geometric parameters of the pipeline;

[0122] A second acquisition unit 23, used to acquire the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline;

[0123] A second calculation unit 24 is used to calculate the actual air mass flow rate discharged from the cathode air intake pipeline based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor and other reference parameters;

[0124] A determination unit 25, used for determining a flow difference between the actual air mass flow rate and the designed flow rate of the air entering the stack;

[0125] An adjusting unit 26, configured to adjust the assumed geometric parameters of the pipeline when the flow difference is greater than the preset difference, so that the flow difference is less than or equal to the preset difference;

[0126] The determination unit 27 is used to determine the pipeline assumed geometric parameters corresponding to the flow difference being less than or equal to the preset difference as pipeline target geometric parameters.

[0127] In some examples, the design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor are determined based on component selection, and the geometric parameters include pipe length, pipe diameter, elbow outer diameter, elbow wall thickness, and the distance from the center of the elbow section to the center of the annulus.

[0128] In some examples, the above-mentioned calculation of the assumed total volume of the cathode gas supply pipeline based on the assumed geometric parameters of the pipeline includes:

[0129] The assumed total volume of the cathode gas supply line mentioned above is calculated based on the following formula:

[0130]

[0131] in, is the diameter of the i-th section of the pipeline, L i is the length of the i-th pipeline, r i is the distance from the center of the i-th elbow section to the center of the torus, S i is the wall thickness of the first elbow, D i is the outer diameter of the ith elbow.

[0132] In some examples, the above-mentioned obtaining the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline includes:

[0133] Obtain the air compressor pressure ratio and the atmospheric pressure of the fuel cell stack operating environment;

[0134] Determine the cathode air intake pipeline pressure based on the air compressor pressure ratio and the atmospheric pressure of the fuel cell stack operating environment;

[0135] Obtain the operating environment temperature of the fuel cell stack, the efficiency of the air compressor and the specific heat capacity of the gas under normal pressure;

[0136] The gas temperature in the cathode air intake pipe is calculated based on the operating environment temperature of the fuel cell stack, the air compressor efficiency and the specific heat capacity of the gas under the normal pressure conditions.

[0137] In some examples, determining the cathode air intake pipe pressure based on the air compressor pressure ratio and the atmospheric pressure of the stack operating environment includes:

[0138] The cathode air intake pipe pressure P is calculated based on the following formula sm :

[0139]

[0140] Wherein, P is the air compressor pressure ratio, is the atmospheric pressure of the operating environment of the above-mentioned fuel cell stack.

[0141] In some examples, the gas temperature in the cathode air intake pipe is calculated based on the operating environment temperature of the fuel cell stack, the air compressor efficiency and the specific heat capacity of the gas under the normal pressure condition, including:

[0142] The gas temperature in the cathode inlet pipe is calculated based on the following formula:

[0143]

[0144] in, is the operating environment temperature of the above stack, For the above air compressor efficiency, is the specific heat capacity of the gas under the above normal pressure conditions.

[0145] In some examples, the actual air mass flow rate discharged from the cathode air intake pipeline is calculated based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, and the assumed total volume of the cathode air supply pipeline, including:

[0146] The actual air mass flow rate discharged from the cathode air intake duct is calculated based on the following formula :

[0147]

[0148] in, is the molar mass of air, R is the ideal gas constant, is the cathode air intake pipe pressure, is the gas temperature in the above-mentioned inlet duct, Assume total volume for cathode gas supply line above.

[0149] like Figure 4 As shown, an embodiment of the present application also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor, and when the processor 320 executes the computer program 311, the steps of any method of designing a gas supply pipeline for the cathode gas supply system of the above-mentioned fuel cell are implemented.

[0150] Since the electronic device introduced in this embodiment is a device used to implement a gas supply pipeline design device of a fuel cell cathode gas supply system in the embodiment of the present application, based on the method introduced in the embodiment of the present application, the technical personnel in this field can understand the specific implementation mode of the electronic device of this embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of the present application will not be introduced in detail here. As long as the equipment adopted by the technical personnel in this field to implement the method in the embodiment of the present application, it belongs to the scope of protection of this application.

[0151] In the specific implementation process, when the computer program 311 is executed by the processor, it can achieve Figure 1 Any implementation manner in the corresponding embodiments.

[0152] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0153] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0154] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0155] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0156] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0157] An embodiment of the present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes the process of designing a gas supply pipeline for a cathode gas supply system of a fuel cell in a corresponding embodiment.

[0158] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.

[0159] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0160] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0161] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0162] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0163] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0164] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for designing a gas supply pipeline for a cathode gas supply system of a fuel cell, characterized in that: include: Obtain the design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor; Calculate the assumed total volume of the cathode gas supply pipeline based on the assumed geometric parameters of the pipeline; Obtaining the cathode air inlet pipeline pressure and the gas temperature in the cathode air inlet pipeline; Calculate the actual air mass flow rate discharged from the cathode air intake pipeline based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor and other reference parameters; Determine the flow difference between the actual air mass flow and the designed flow of air into the stack; When the flow difference is greater than a preset difference, adjusting the assumed geometric parameters of the pipeline so that the flow difference is less than or equal to the preset difference; Determine the pipeline assumed geometric parameter corresponding to when the flow difference is less than or equal to the preset difference as the pipeline target geometric parameter; The actual air mass flow rate discharged from the cathode air intake pipeline is calculated based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor and other reference parameters, including: The actual air mass flow rate discharged from the cathode air intake duct is calculated based on the following formula : in, is the molar mass of air, R is the ideal gas constant, is the cathode air intake pipe pressure, is the gas temperature in the pole inlet duct, Assuming a total volume for the cathode gas supply line, is the air mass flow rate discharged by the air compressor.

2. The method according to claim 1, characterized in that The design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor are determined based on the selection of components, and the geometric parameters include pipe length, pipe diameter, elbow outer diameter, elbow wall thickness and the distance from the center of the elbow section to the center of the annulus.

3. The method according to claim 2, characterized in that The calculating of the assumed total volume of the cathode gas supply pipeline based on the assumed geometric parameters of the pipeline includes: The assumed total volume of the cathode gas supply line is calculated based on the following formula: in, is the diameter of the i-th section of the pipeline, L i is the length of the i-th pipeline, r i is the distance from the center of the i-th elbow section to the center of the torus, S i is the wall thickness of the first elbow, D i is the outer diameter of the ith elbow.

4. The method according to claim 1, characterized in that: The obtaining of the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline comprises: Obtain the air compressor pressure ratio and the atmospheric pressure of the fuel cell stack operating environment; Determining the cathode air intake pipeline pressure based on the air compressor pressure ratio and the atmospheric pressure of the fuel cell stack operating environment; Obtain the operating environment temperature of the fuel cell stack, the efficiency of the air compressor and the specific heat capacity of the gas under normal pressure; The gas temperature in the cathode air intake pipe is calculated based on the operating environment temperature of the fuel cell stack, the air compressor efficiency and the specific heat capacity of the gas under normal pressure conditions.

5. The method according to claim 4, characterized in that The determining the cathode air intake pipeline pressure based on the air compressor pressure ratio and the atmospheric pressure of the stack operating environment includes: The cathode air intake pipe pressure P is calculated based on the following formula: sm : Wherein, P is the air compressor pressure ratio, is the atmospheric pressure of the fuel cell stack operating environment.

6. The method according to claim 4, characterized in that The calculating the gas temperature in the cathode air intake pipe based on the operating environment temperature of the fuel cell stack, the air compressor efficiency and the specific heat capacity of the gas under the normal pressure condition includes: The gas temperature in the cathode air intake pipe is calculated based on the following formula: in, is the operating environment temperature of the battery stack, is the air compressor efficiency, is the specific heat capacity of the gas under the normal pressure conditions.

7. A gas supply pipeline design device for a fuel cell cathode gas supply system, characterized in that: include: A first acquisition unit is used to acquire the design flow rate of air entering the stack and the mass flow rate of air discharged by the air compressor; A first calculation unit, used for calculating an assumed total volume of the cathode gas supply pipeline based on assumed geometric parameters of the pipeline; A second acquisition unit, used to acquire the cathode air intake pipeline pressure and the gas temperature in the cathode air intake pipeline; a second calculation unit, for calculating the actual air mass flow rate discharged from the cathode air intake pipeline based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor and other reference parameters; A determination unit, used for determining a flow difference between the actual air mass flow and the designed flow of air entering the stack; an adjusting unit, configured to adjust the assumed geometric parameters of the pipeline when the flow difference is greater than a preset difference, so that the flow difference is less than or equal to the preset difference; A determining unit, configured to determine the pipeline assumed geometric parameter corresponding to the flow difference being less than or equal to the preset difference as a pipeline target geometric parameter; The actual air mass flow rate discharged from the cathode air intake pipeline is calculated based on the cathode air intake pipeline pressure, the gas temperature in the cathode air intake pipeline, the assumed total volume of the cathode air supply pipeline, the air mass flow rate discharged from the air compressor and other reference parameters, including: The actual air mass flow rate discharged from the cathode air intake duct is calculated based on the following formula : in, is the molar mass of air, R is the ideal gas constant, is the cathode air intake pipe pressure, is the gas temperature in the pole inlet duct, Assuming a total volume for the cathode gas supply line, is the air mass flow rate discharged by the air compressor.

8. An electronic device comprising: A memory and a processor, characterized in that the processor is used to implement the steps of the gas supply pipeline design method of the fuel cell cathode gas supply system as described in any one of claims 1-6 when executing the computer program stored in the memory.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for designing a gas supply pipeline of a cathode gas supply system for a fuel cell as described in any one of claims 1 to 6 are implemented.

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