Air supply system and fuel cell engine with same

Abstract

The utility model discloses an air supply system and a fuel cell engine with the air supply system, the air supply system comprises an air compression assembly, an oxygen separation assembly and a humidification assembly, the air compression assembly is used for providing compressed air; the input end of the oxygen separation assembly is connected with the air compression assembly, the first output end of the oxygen separation assembly is connected with the input end of the humidification assembly, the first output end is used for outputting separated oxygen, the second output end of the oxygen separation assembly is used for discharging separated nitrogen, and the third output end of the oxygen separation assembly is used for discharging separated impurities; the output end of the humidifying assembly is connected with the electric pile and used for inputting the separated oxygen into the electric pile. Therefore, impurities in the air are separated out through the oxygen separation assembly, then high-concentration oxygen is input into the electric pile, the catalytic activity utilization rate is increased, the efficiency of a fuel cell engine is improved, and the cost of the electric pile is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to an air supply system and a fuel cell engine having the same. Background Art

[0002] A fuel cell engine is an engine system that converts chemical energy of hydrogen and oxygen into electrical energy through an electrochemical reaction. The air supply system of a fuel cell engine is one of its key components. It is mainly responsible for filtering, humidifying, and regulating the pressure of the air entering the fuel cell stack to ensure that the temperature, humidity, pressure, and flow rate on the cathode side of the fuel cell stack are within the optimal range. At the same time, the air supply system is also particularly important when increasing engine power.

[0003] In the related art, the engine power is usually increased by increasing the operating speed of the air circuit and the air flow metering ratio (the ratio of the actual flow to the theoretical required flow).

[0004] However, the fuel cell engine system in the prior art does not filter the air, resulting in a low oxygen concentration in the gas entering the stack. When the engine is in high-power operation, the air flow rate increases, and the pressure of the intercooler, humidifier and radiator increases, resulting in a shortened life of these components and a large amount of oxygen in the gas entering the stack being discharged without being used, resulting in waste, which needs to be solved urgently. Utility Model Content

[0005] The utility model provides an air supply system and a fuel cell engine having the same, so as to solve the problem in the related art that air enters the fuel cell engine system without being filtered, resulting in excessive pressure on components and loss of life and a large amount of oxygen being wasted when the engine is in a high-power condition, thereby improving the utilization rate of catalytic activity, enhancing the efficiency of the fuel cell engine and reducing the cost of the stack.

[0006] The utility model provides an air supply system, comprising:

[0007] Air compression components, oxygen separation components and humidification components, among which,

[0008] The air compressor assembly is used to provide compressed air;

[0009] The input end of the oxygen separation component is connected to the air compression component, the first output end of the oxygen separation component is connected to the input end of the humidification component, the first output end is used to output the separated oxygen, the second output end of the oxygen separation component is used to discharge the separated nitrogen, and the third output end of the oxygen separation component is used to discharge the separated impurities;

[0010] The output end of the humidification component is connected to the fuel cell stack, and is used to input the separated oxygen into the fuel cell stack.

[0011] Optionally, the oxygen separation component includes: an intake combined valve, an oxygen separation membrane, a bypass valve, a gas-liquid separator, and a drain valve, where

[0012] The input end of the intake combined valve is connected to the air compression component;

[0013] The input end of the oxygen separation membrane is respectively connected to the bypass outlet of the intake combined valve and the input end of the bypass valve to discharge the separated nitrogen through the bypass valve, and the output end of the oxygen separation membrane is connected to the input end of the gas-liquid separator; the output end of the gas-liquid separator is respectively connected to the main path outlet of the intake combined valve and the input end of the humidification component, and the drain port of the gas-liquid separator is connected to the input end of the drain valve to discharge the separated impurities through the drain valve.

[0014] Optionally, the gas-liquid separator is a gas-liquid separator.

[0015] Optionally, the air supply system further includes:

[0016] A silencing component, the input end of the silencing component is respectively connected to the output end of the bypass valve and the output end of the drain valve.

[0017] Optionally, the air supply system further includes:

[0018] An intercooler, the input end of the intercooler is connected to the output end of the air compression component, and the output end of the intercooler is connected to the input end of the intake combined valve.

[0019] Optionally, the air supply system further includes:

[0020] A back pressure valve, the input end of the back pressure valve is connected to the humidification component, and the output end of the back pressure valve is connected to the silencing component.

[0021] Optionally, the air supply system further includes:

[0022] A filtering component, the output end of the filtering component is connected to the input end of the air compression component.

[0023] Optionally, the air supply system further includes:

[0024] A flow meter, the flow meter is arranged between the output end of the filtering component and the input end of the air compression component.

[0025] Optionally, the air compression component is an air compressor.

[0026] On the other hand, the present utility model provides a fuel cell engine, which includes the above air supply system.

[0027] Therefore, an oxygen separation component is added. The impurities in the air are separated by the oxygen separation component, and then the high-concentration oxygen is input into the fuel cell stack, which solves the problems in the related art that the air enters the fuel cell engine system without filtration treatment, resulting in excessive element pressure and shortened service life when the engine is in a high-power working condition, and a large amount of oxygen is wasted. It improves the utilization rate of catalytic activity, enhances the efficiency of the fuel cell engine, and reduces the cost of the fuel cell stack.

[0028] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, in which:

[0030] Figure 1 is a schematic structural diagram of an air supply system and a fuel cell stack in the related art;

[0031] Figure 2 is a schematic structural diagram of an air supply system according to an embodiment of the present utility model;

[0032] Figure 3 is a schematic structural diagram of an air supply system according to a specific embodiment of the present utility model;

[0033] Figure 4 is a flowchart of an oxygen supply control method for an air supply system according to an embodiment of the present utility model;

[0034] Figure 5 is a flowchart of an oxygen supply control method for an air supply system according to a specific embodiment of the present utility model.

[0035] REFERENCE SIGNS:

[0036] 1 - Filter, 2 - Meter, 3 - Air Compressor, 4 - Cooling Component, 5 - Intake Component, 6 - Humidifier, 7 - Back Pressure Component, 8 - Muffler, 9 - First Sealing Valve, 10 - Temperature Sensor, 11 - Pressure Sensor, 12 - Fuel Cell Stack, 13 - Second Sealing Valve, 20 - Air Supply System, 100 - Air Compression Component, 200 - Oxygen Separation Component, 201 - Intake Combination Valve, 202 - Oxygen Separation Membrane, 203 - Gas-Liquid Separation Part, 204 - Bypass Valve, 205 - Drain Valve, 300 - Humidification Component, 601 - Memory, 602 - Processor, 603 - Communication Interface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0038] The air supply system of the embodiments of the present utility model and a fuel cell engine having the same will be described below with reference to the accompanying drawings.

[0039] Before introducing the air supply system of the embodiments of the present utility model and a fuel cell engine having the same, the air supply system adopted in the related art will be briefly introduced.

[0040] Specifically, as Figure 1 shown, Figure 1 is a schematic structural diagram of an air supply system and a fuel cell stack in the related art, where:

[0041] Filter 1, meter 2, air compressor 3, cooling assembly 4, intake assembly 5, humidifier 6, backpressure assembly 7, silencer 8, first sealing valve 9, temperature sensor 10, pressure sensor 11, fuel cell stack 12, second sealing valve 13.

[0042] The output end of filter 1 is connected to the input end of air compressor 3. A flowmeter 2 is provided between filter 1 and air compressor 3. The output port of air compressor 3 is connected to the input port of cooling assembly 4. The output end of cooling assembly 4 is connected to the input end of intake assembly 5. One output end of intake assembly 5 is connected to the input end of humidifier 6. The other output end of intake assembly 5 is connected to silencer 8. One output end of humidifier 6 is connected to the input end of first sealing valve 9. The other output end of humidifier 6 is connected to the input end of backpressure assembly 7. The output end of backpressure assembly 7 is connected to silencer 8. The output end of first sealing valve 9 is connected to the inlet of fuel cell stack 12. A temperature sensor 10 and a pressure sensor 11 are provided between first sealing valve 9 and the inlet of fuel cell stack 12. The outlet of fuel cell stack 12 is connected to the input end of second sealing valve 13. The output end of second sealing valve 13 is connected to the other input end of humidifier 6. Air passes through filter 1 to filter dust and impurities. Air compressor 2 pressurizes the air to enter cooling assembly 3. Cooling assembly 3 cools the incoming air to control the air temperature within a temperature range suitable for chemical reactions. At the same time, humidifier 6 humidifies the dry air into a humidity suitable for participating in chemical reactions. During this process, if it is detected that the air pressure exceeds a certain threshold, a part of the air is discharged through backpressure assembly 7 to make the air participating in the chemical reaction in fuel cell stack 12 in an appropriate amount.

[0043] However, when the stack is in a low-power operating condition, the fuel cell engine requires a relatively low air flow pressure. At this time, the minimum operating condition of the air compressor cannot meet the usage requirements. If the air compressor pressure needs to be satisfied, the air flow rate will increase, and all the air will flow into the fuel cell air path, causing the membrane electrode to become overly dry, reducing its performance, and affecting durability. Therefore, an intake combination valve needs to be coordinated to open the bypass path of the intake combination valve to discharge the excessive flow rate, wasting the energy of the air compressor. In the high-power range, to increase the reaction rate of the fuel cell stack, the air compressor needs to increase the operating pressure and air flow rate, increasing the air stoichiometry (the current industry air stoichiometry is about 2). However, a large amount of oxygen in the air is not used, and the exhaust gas contains a large amount of oxygen and energy. Moreover, as the air flow rate increases, the reaction speeds up, the parasitic power of the air compressor increases, and the output of the fuel cell stack decreases. The cooling capacity of the intercooler, the humidifying capacity of the humidifier, and the heat dissipation capacity of the radiator all need to be increased, resulting in a relatively large increase in cost. At the same time, the volume of the intercooler and humidifier increases, which increases the layout difficulty of the fuel cell system, reduces the volume power density of the system, increases the pressure drop, and also increases the power consumption of the air compressor.

[0044] It is precisely to solve the above problems that when air enters the fuel cell engine system without being filtered, the component pressure is too high during high-power operating conditions, easily reducing the service life and wasting a large amount of oxygen. The present utility model provides an air supply system. In this system, oxygen is separated by an oxygen separation component, while nitrogen and other gas impurities are discharged through a bypass valve, so that the concentration of oxygen participating in the reaction is increased as much as possible, the utilization rate of catalytic activity is increased, the activation overvoltage is reduced, the working burden of components such as the intercooler and humidifier is alleviated, the reaction rate of the fuel cell engine is optimized, and a smaller-power stack can be selected at the same power, reducing costs.

[0045] Specifically, Figure 1 FIG. is a schematic structural diagram of an air supply system according to an embodiment of the present utility model.

[0046] As Figure 2 shown, the air supply system 20 includes: an air compression component 100, an oxygen separation component 200, and a humidifying component 300.

[0047] Among them, the air compression component 100 is used to provide compressed air; the input end of the oxygen separation component 200 is connected to the air compression component 100, the first output end of the oxygen separation component 200 is connected to the input end of the humidifying component 300, the first output end is used to output the separated oxygen, the second output end of the oxygen separation component 200 is used to discharge the separated nitrogen, and the third output end of the oxygen separation component 300 is used to discharge the separated impurities; the output end of the humidifying component 300 is connected to a stack (not shown in the figure) and is used to input the separated oxygen into the stack.

[0048] Specifically, the air component pressurizes the air. Due to the pressure difference, the compressed air enters the oxygen separation component. The oxygen separation component separates the air, filters out gases such as nitrogen other than oxygen in the air, and discharges them through the second output end. The oxygen-rich air after filtration is separated again to separate water, oil, and other impurities, and is discharged through the third output end. The oxygen-rich air without impurities is humidified by the humidification component and becomes a gas carrying a certain amount of water vapor and enters the fuel cell stack, making the inside of the fuel cell stack in a suitable water saturation state to ensure the rate of chemical reactions.

[0049] Among them, in some embodiments, the air compression component 100 is an air compressor.

[0050] Specifically, the air compression component compresses air or other gases and provides a stable gas output stream. The compressed air enters the fuel cell stack to carry out an oxidation-reduction reaction with hydrogen and generate electric energy. The present utility model can select an air compressor as the air compression component to achieve the effect of pressurizing the air.

[0051] Optionally, in some embodiments, the oxygen separation component 200 includes: an intake combination valve, an oxygen separation membrane, a bypass valve, a gas-liquid separator, and a drain valve.

[0052] Among them, the input end of the intake combination valve is connected to the air compression component; the input end of the oxygen separation membrane is respectively connected to the bypass outlet of the intake combination valve and the input end of the bypass valve to discharge the separated nitrogen through the bypass valve. The output end of the oxygen separation membrane is connected to the input end of the gas-liquid separator; the output end of the gas-liquid separator is respectively connected to the main path outlet of the intake combination valve and the input end of the humidification component. The drain port of the gas-liquid separator is connected to the input end of the drain valve to discharge the separated impurities through the drain valve.

[0053] It can be understood that untreated air contains a large amount of nitrogen and a small amount of other gases. The content of oxygen in the air only accounts for about 20%. Since only oxygen is required in the chemical reaction process of the fuel cell, the chemical reaction rate can be increased by increasing the oxygen concentration.

[0054] Specifically, as Figure 3 shown, Figure 3Schematic diagram of the structure of an air supply system provided according to a specific embodiment of the present utility model. Among them, the air supply system includes: an air compressor assembly 100, an intake combined valve 201, an oxygen separation membrane 202, a gas-liquid separator 203, a bypass valve 204, a drain valve 205, and a humidification assembly 300. During operation, the air compressor assembly pressurizes the air, and the pressurized air enters the front end of the oxygen separation membrane through the intake combined valve. The oxygen separation membrane has selective permeability to oxygen. Due to the pressure difference between the front and rear ends, oxygen-enriched air passes through on the low-pressure side (permeation side) of the oxygen separation membrane, and other gases such as nitrogen cannot pass through the oxygen separation membrane and are discharged from the bypass valve; the oxygen-enriched air passing through the oxygen separation membrane enters the gas-liquid separator, and through the separation of the gas-liquid separator, liquid impurities such as water vapor in the oxygen-enriched air are separated, and the separated impurities are discharged through the drain valve. The dried oxygen-enriched air after separation enters the humidification assembly, and the humidification assembly humidifies the dried oxygen-enriched air to make the dried oxygen-enriched air into a reaction-ready gas with an appropriate humidity to improve the reaction rate of the fuel cell stack.

[0055] Among them, in some embodiments, the gas-liquid separator is a gas-liquid separator.

[0056] Specifically, the gas-liquid separator in the embodiment of the present utility model can be a gas-liquid separator, and the gas-liquid separator is based on the density difference between gas and liquid and hydrodynamic effects. When gas and liquid flow mixed, due to their density difference, the liquid tends to deposit at the bottom to form a liquid phase, while the gas is located at the upper part to form a gas phase. Thus, gas-liquid separation is achieved.

[0057] Optionally, in some embodiments, the above air supply system further includes: a silencing assembly, and the input end of the silencing assembly is respectively connected to the output end of the bypass valve and the output end of the drain valve.

[0058] Specifically, the output end of the bypass valve and the output end of the drain valve are both connected to the silencing assembly. The bypass valve and the drain valve are periodically opened to discharge the separated gases such as nitrogen and other impurities such as water and oil. During the discharge process, noise is generated due to the vibration of the gas and other impurities passing through the pipeline. Therefore, installing a silencer in the exhaust path can effectively reduce the exhaust noise.

[0059] Optionally, in some embodiments, the above air supply system further includes: an intercooler, the input end of the intercooler is connected to the output end of the air compressor assembly, and the output end of the intercooler is connected to the input end of the intake combined valve.

[0060] Specifically, after the air is compressed, its temperature rises due to the increase in air pressure. The high-temperature air is not suitable for participating in the chemical reaction of the fuel cell stack, and it is necessary to cool it first. In the embodiment of the present invention, an intercooler is arranged behind the air compressor assembly to cool the air entering the intake combination valve. When the high-temperature and high-pressure supercharged air flows through the intercooler, its heat is exchanged with the cooling medium (such as wind or water) in the intercooler, thereby reducing the intake air temperature.

[0061] Optionally, in some embodiments, the above air supply system further includes: a back pressure valve, the input end of the back pressure valve is connected to the humidification assembly, and the output end of the back pressure valve is connected to the silencing assembly.

[0062] Specifically, the back pressure valve is used to adjust the back pressure of the air path of the fuel cell engine. Optionally, in some embodiments, the above air supply system further includes: a filtering assembly, the output end of the filtering assembly is connected to the input end of the air compressor assembly.

[0063] Specifically, before the air enters the air compressor assembly, it is necessary to filter the air first, filter out impurities such as dust in the air, and ensure that the air entering the air compressor assembly will not affect the activity of the fuel cell catalyst. Optionally, in some embodiments, the above air supply system further includes: a flow meter, and the flow meter is arranged between the output end of the filtering assembly and the input end of the air compressor assembly.

[0064] Specifically, the flow meter is used to measure the flow velocity of the air, and monitor the air inflow and outflow by detecting the air flow velocity. In the embodiment of the present invention, a flow meter is arranged between the filtering assembly and the air compressor assembly to monitor the air flow entering.

[0065] To enable those skilled in the art to further understand the air supply system of the embodiment of the present invention, the oxygen supply control method of the air supply system will be elaborated in detail below with reference to specific embodiments.

[0066] Specifically, as Figure 4 shown, Figure 4 is a flowchart of an oxygen supply control method for an air supply system provided by an embodiment of the present invention, including the following steps:

[0067] Step S401, obtain the current output power and target power of the fuel cell engine.

[0068] Among them, the current output power refers to the power value actually output by the fuel cell engine in the current working state; the target power refers to the power value that the fuel cell engine is expected to reach under specific working conditions.

[0069] Specifically, the target power of the fuel cell engine varies with the working conditions. For example, when the vehicle changes from normal driving to climbing a slope, the power of the engine should increase accordingly, and its target power also increases. However, during actual driving, the current output power of the engine may not necessarily reach the target power. Therefore, in the embodiments of the present invention, while obtaining the target power, it is also necessary to obtain the actual current output power.

[0070] Step S402: Determine the current working condition of the fuel cell engine according to the current output power and the target power, determine the first target opening degree of the intake combination valve according to the current working condition, and determine the target speed of the air compressor and the second target opening degree of the back pressure valve of the air supply system based on the first target opening degree, and determine the target opening and closing cycle of the drain valve and the third target opening degree of the bypass valve according to the current working condition.

[0071] Specifically, judge the current working condition of the fuel cell engine through the magnitude relationship among the target power, the current output power, and the preset power. When the target power is less than or equal to the preset power, it indicates that the target power required by the vehicle is relatively low. At this time, it is determined that the current working condition is a low-power working condition; if the target power is greater than the preset power, then judge whether the current output power is less than the target power. If the current output power is less than the target power, it means that the output of the current fuel cell engine has not reached the target power yet. Therefore, it is still necessary to continue to increase the current output power. At this time, it is determined that the current working condition is a loading working condition; if the target power is greater than the preset power and the current output power is equal to the target power, it means that the current output power has reached the target power requirement. After the current output power reaches the target power for more than 1 s, it is determined that the current working condition is a steady-state working condition; if the target power is greater than the preset power and the current output power is greater than the target power, the output of the fuel cell engine has exceeded the target power. To avoid waste of energy, it is necessary to reduce the power of the fuel cell engine. At this time, it is determined that the current working condition is a unloading working condition.

[0072] Exemplarily, the working conditions are divided into a low-power working condition, a loading working condition, a unloading working condition, and a steady-state working condition according to the current output power and the target power. Among them:

[0073] (1) When the target power ≤ 30%PE, it is in a low-power working condition, and the combination valve is closed; when operating in a low-power working condition, the intake combination valve is closed, and all the air passes through the oxygen separation membrane to generate pure oxygen. The calibration gas-liquid separator switch cycle discharges water, oil, and other impurities, and uses pure oxygen to participate in the chemical reaction to increase the efficiency of the fuel cell engine.

[0074] (2) When the target power > 30% PE and the actual output power < the target power, the system is in the loading condition. The intake combination valve is fully open for power loading; during the loading condition, there is a lag in oxygen separation by the oxygen separation membrane. At this time, the intake combination valve needs to increase its opening degree, and air directly enters the humidifier inlet for rapid loading to ensure the loading speed of the fuel cell.

[0075] (3) When the target power > 30% PE and the actual output power > the target power, the system is in the unloading condition. The intake combination valve is closed slightly for power unloading.

[0076] (4) When the target power > 30% PE and the actual output power = the target power, the system is in the steady state condition. The intake combination valve is closed slightly to increase the use of high-oxygen-content air; in the steady state condition, the intake combination valve tries to minimize its opening degree to increase the proportion of pure oxygen use and maintain the high efficiency of the fuel cell engine.

[0077] In addition, the air demand value is determined by the first target opening degree of the intake combination valve. Each power condition corresponds to a flow rate and pressure of air / oxygen. When operating at a stable power, the calculation formula for the oxygen consumption is:

[0078] Wo 2,reacted = Mo2 * nI / (4F)

[0079] where Wo 2,reacted is the oxygen consumption (g / s), Mo2 is the molar mass of oxygen (32 g / mol), n is the number of single cells in the stack, I is the stack current (A, i.e., C / s representing the charge of electrons passing through per second), F is the Faraday constant (C / mol), representing the amount of charge per mole, and 4 means that 4 mol of electrons are generated when 1 mol of oxygen reacts. nI / (4F) represents the amount of oxygen consumed per second in terms of moles.

[0080] According to the ideal gas state equation PV = nRT and ρ = m / V, by conversion, we get ρ1 = ρ2 * (P1 / P2) * (T2 / T1), where the unit of temperature T is K, the unit of pressure P is Pa, and the unit of ρ is Kg / m 3 .

[0081] Under standard conditions (0 °C, 1 atm), the oxygen density is 1.429 Kg / m 3 , so the oxygen density ρ at different temperatures = 1.429 * (actual pressure / standard physical atmospheric pressure) * (273.15 / actual absolute temperature);

[0082] The volume percentages of each component in air: nitrogen (N2) accounts for about 78%, and oxygen (O2) accounts for about 21%. At different temperatures, the volume of oxygen in the used air is:

[0083] V = nI * 1.429 * (actual pressure / standard physical atmospheric pressure) * (273.15 / actual absolute temperature) / [0.21 * (4F)];

[0084] The excess air coefficient of the fuel cell is α. At different temperatures, calculate the amount of air (under standard conditions) passing through the intake combination valve per second under the load increase condition:

[0085] Wair = αnI * 1.429 * (actual pressure / standard physical atmospheric pressure) * (273.15 / actual absolute temperature) / [0.21 * (4F)];

[0086] Wo2 = αMo2 * nI / (4F);

[0087] Thus, according to the above calculation formulas and the air compressor MAP, determine the theoretical pressure at different power points, calculate the air demand value at the calculated flow rate, and determine the theoretical air compressor speed and the opening degree of the back pressure valve at each working condition point. During the steady-state operation process at each power point, due to the influence of actual problems such as the flow resistance of the air pipeline and air filter and the back pressure of the exhaust pipeline, the theoretical flow rate and pressure and the actual flow rate and pressure are based on the pressure P that the fuel cell stack needs to maintain when extracting this current 理论 , the calculated value W of the air / oxygen flow rate 理论 as the target value, and the real-time pressure and the pressure P feedback by the flow sensor collected from the air pipeline 实际 , the flow rate W 实际 as the actual value, and calibrate by comparing the relationship between the theoretical value and the actual value:

[0088] The influence of the adjustment of the air compressor and the back pressure valve on the flow rate and pressure is as follows:

[0089] (1) When the air compressor speed increases and the opening degree of the back pressure valve remains unchanged, the actual operating pressure increases and the flow rate increases;

[0090] (2) When the air compressor speed decreases and the opening degree of the back pressure valve remains unchanged, the actual operating pressure decreases and the flow rate decreases;

[0091] (3) When the air compressor speed remains unchanged and the opening degree of the back pressure valve decreases, the actual operation increases and the flow rate decreases;

[0092] (4) When the air compressor speed remains unchanged and the opening degree of the back pressure valve increases, the actual operation increases and the flow rate decreases.

[0093] Step S403, control the intake combination valve according to the first target opening degree, control the air compressor according to the target speed, control the back pressure valve according to the second target opening degree, control the drain valve according to the target opening and closing cycle, and control the bypass valve according to the third target opening degree.

[0094] Specifically, the first target opening of the intake combination valve is determined according to the current working condition, the target speed of the air compressor and the second target opening of the back pressure valve are determined according to the first target opening, the target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current working condition. After the FCU obtains these target data, the intake combination valve is controlled according to the first target opening, the air compressor is controlled according to the target speed, the back pressure valve is controlled according to the second target opening, the drain valve is controlled according to the target opening and closing cycle, and the bypass valve is controlled according to the third target opening.

[0095] To enable those skilled in the art to further understand the oxygen supply control method of the air supply system of the present application embodiment, the following will be elaborated in detail with specific embodiments.

[0096] Specifically, as Figure 5 shown, the oxygen supply control method of the air supply system includes the following steps:

[0097] S501, the FCU sends power data to start the fuel cell engine.

[0098] S502, judge the current working condition. When the target power > the preset power and the current output power < the target power, execute step S503; when the target power > the preset power and the current output power = the target power or when the target power ≤ the preset power, execute step S504; when the target power ≤ the preset power, execute step S505; when the target power > the preset power and the current output power > the target power, execute step S506.

[0099] S503, the current working condition is the loading condition, and then execute step S507.

[0100] S504, the current working condition is the steady state condition, and then execute step S508.

[0101] S505, the current working condition is the low power condition, and then execute step S509.

[0102] S506, the current working condition is the unloading condition, and then execute step S510.

[0103] S507, the opening of the intake combination valve increases, reducing the consumption of high-purity oxygen and quickly loading.

[0104] S508, the opening of the intake combination valve is minimized as much as possible, increasing the consumption of high-purity oxygen.

[0105] S509, the intake combination valve is closed, and only high-purity oxygen is used.

[0106] S510, the intake combination valve decreases, increasing the consumption of high-purity oxygen.

[0107] S511, adjust the rotational speed of the air compressor to the target value and adjust the back pressure valve to the second target opening degree.

[0108] S512, calibrate the target opening and closing cycle of the drain valve and calibrate the third target opening degree of the bypass valve.

[0109] In summary, the air supply system of the present utility model adds an oxygen separation component to separate impurities in the air, increases the oxygen concentration, reduces the inlet air flow rate, greatly reduces the burden on the cooling and exhaust components, reduces the wasted oxygen at the same time, improves the utilization rate of catalytic activity, enhances the efficiency of the fuel cell engine, and reduces the cost of the fuel cell stack.

[0110] According to the air supply system provided by the embodiment of the present utility model, an oxygen separation component is added. The impurities in the air are separated by the oxygen separation component, and then the high-concentration oxygen is input into the fuel cell stack, solving the problems in the related art that the air enters the fuel cell engine system without filtration treatment, resulting in excessive pressure on the components and easy loss of life when the engine is in a high-power working condition, and a large amount of oxygen is wasted. It improves the utilization rate of catalytic activity, enhances the efficiency of the fuel cell engine, and reduces the cost of the fuel cell stack.

[0111] In addition, the embodiment of the present utility model also provides a fuel cell engine, which includes the above-mentioned air supply system.

[0112] According to the fuel cell engine provided by the present utility model, through the above-mentioned air supply system, the problems in the related art that the air enters the fuel cell engine system without filtration treatment, resulting in excessive pressure on the components and easy loss of life when the engine is in a high-power working condition, and a large amount of oxygen is wasted are solved. It improves the utilization rate of catalytic activity, enhances the efficiency of the fuel cell engine, and reduces the cost of the fuel cell stack.

[0113] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or N embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0114] Furthermore, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

Claims

1. An air supply system, characterized in that, Comprising: An air compression component, an oxygen separation component, and a humidification component, wherein The air compression component is used to provide compressed air; The input end of the oxygen separation component is connected to the air compression component, the first output end of the oxygen separation component is connected to the input end of the humidification component, the first output end is used to output the separated oxygen, the second output end of the oxygen separation component is used to discharge the separated nitrogen, and the third output end of the oxygen separation component is used to discharge the separated impurities; The output end of the humidification component is connected to the fuel cell stack, and is used to input the separated oxygen into the fuel cell stack.

2. The air supply system according to claim 1, wherein The oxygen separation component includes: an intake combined valve, an oxygen separation membrane, a bypass valve, a gas-liquid separation part, and a drain valve, wherein The input end of the intake combined valve is connected to the air compression component; The input ends of the oxygen separation membrane are respectively connected to the bypass outlet of the intake combined valve and the input end of the bypass valve, so as to discharge the separated nitrogen through the bypass valve, and the output end of the oxygen separation membrane is connected to the input end of the gas-liquid separation part; the output end of the gas-liquid separation part is respectively connected to the main path outlet of the intake combined valve and the input end of the humidification component, and the drain port of the gas-liquid separation part is connected to the input end of the drain valve, so as to discharge the separated impurities through the drain valve.

3. The air supply system according to claim 2, wherein, The gas-liquid separation part is a gas-liquid separator.

4. The air supply system according to claim 2, wherein Further comprising: A silencing component, the input ends of the silencing component are respectively connected to the output end of the bypass valve and the output end of the drain valve.

5. The air supply system according to claim 2, wherein Further comprising: An intercooler, the input end of the intercooler is connected to the output end of the air compression component, and the output end of the intercooler is connected to the input end of the intake combined valve.

6. The air supply system according to claim 2, characterized in that, Further comprising: A back pressure valve, the input end of the back pressure valve is connected to the humidification component, and the output end of the back pressure valve is connected to the silencing component.

7. The air supply system according to claim 1, characterized in that, Further comprising: A filtering component, the output end of the filtering component is connected to the input end of the air compression component.

8. The air supply system according to claim 7, wherein Further comprising: A flow meter, the flow meter is arranged between the output end of the filtering component and the input end of the air compression component.

9. The air supply system according to claim 1, characterized in that, The air compression component is an air compressor.

10. A fuel cell engine, characterized in that, Comprising: The air supply system according to any one of claims 1-9.

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