Methods, devices, equipment, and storage media for controlling the performance parameters of membrane humidifiers

Abstract

This invention discloses a method, apparatus, device, and storage medium for parameter control of a membrane humidifier. The method includes: determining the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies in the humidifier according to the first law of thermodynamics; determining the water vapor transmission rate through the membrane based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time; determining the inlet flow rate of the first and second control bodies based on the relationship between the first and second control bodies and the water vapor transmission rate through the membrane; and adjusting the operating state of the humidifier based on the water vapor transmission rate through the membrane, the inlet flow rate of the first and second control bodies.

Description

Technical Field

[0001] This invention relates to the field of proton exchange membrane fuel cell technology, and in particular to a method, apparatus, device, and storage medium for parameter control of membrane humidifier performance in proton exchange membrane (PEM) fuel cells. Background Technology

[0002] Optimal humidification of the reactant gas in a proton exchange membrane (PEM) fuel cell has a significant impact on its performance. Water management plays a crucial role in balancing fuel cell performance to ensure high ionic conductivity of the electrolyte, requiring a sufficiently high membrane water capacity, especially at high current densities. Dry conditions shorten membrane life and lead to membrane-electrode adhesion. Conversely, water transferred to the cathode can accumulate in the cathode gas diffusion layer. Excessive water accumulation in the cathode can condense and close some pores in the gas diffusion layer, preventing oxygen from reaching the cathode catalyst layer. This phenomenon, known as buoyancy, reduces the chemical reaction rate and cell voltage. Buoyancy typically occurs at high current densities, especially at low inlet flow rates and low temperatures. A reactor gas humidifier should be used before entering the cell and adjusting the humidification rate, particularly on the anode side. Even humidification is necessary to prevent the membrane near the anode inlet from drying out; without wetted reactant gases, cell performance degrades by 20%–40%.

[0003] There are different methods for humidifying reactive gases, which can be divided into two categories: external humidification and internal humidification. Internal humidification methods include integrating membrane humidifiers with cell blocks, using membrane additives, using porous absorbent sponges, appropriately distributing water, and directly injecting liquid water or steam. External humidification methods mainly include bubble method or dew point method, enthalpy wheel method, and membrane method.

[0004] Of these methods, membrane humidifiers are the simplest and most common humidification method, offering the lowest energy consumption by reducing the complexity of fuel cell systems and their porosity power. This method uses a semi-permeable membrane. Geometrically, there are two types of membrane humidifiers: flat-plate and shell-and-tube. Moist gas (or liquid water (and fuel) or air) flows through channels on both sides of the membrane, humidifying the dry gas through evaporation at the membrane / gas interface. Utilizing the heat and water generated inside the cell, the volume of the fuel cell system is reduced without the use of nozzles. Therefore, this humidification method is the best choice for controlling the moisture entering the fuel cell.

[0005] Limitations of this method can be pointed out, such as the lack of sufficient control over the humidification process and membrane humidification, the rate of moisture absorption by the gas, the functional parameters of membrane permeability, the temperature and operating pressure of the humidifier, and the flow rate through the humidifier. Nevertheless, the membrane method remains one of the most commonly used methods for humidifying reactant gases in fuel cell systems.

[0006] In terms of flow direction, humidifiers, like converters, are divided into three types: parallel current, reverse current, and cross current; studies have shown that counter-current membrane humidifiers are the most effective. On the cathode side, it is humidified, and the gas entering the cathode or anode cell is the humidified gas output by the humidifier.

[0007] Research on membrane humidifiers falls into two main categories: laboratory studies and numerical studies. Qiu and Merida presented laboratory studies on humidifier performance and investigated water flow in a gas-to-film humidifier in the laboratory, demonstrating how reducing the dry-side flow can increase the outlet dew point. In a laboratory study, Howzing et al. introduced a dimensionless parameter that correlates the residence time and permeation time of water molecules in the humidifier channel. Numerous laboratory studies have been conducted, primarily aimed at investigating the effects of various dimensional and functional parameters of humidifiers.

[0008] Numerical studies include analytical models, thermodynamic models, and two-dimensional models. Park et al. proposed an analytical model for membrane humidifiers used with liquid water; in their model, they assumed a constant total temperature of the humidifier. Based on the significant role of temperature and heat in vapor transport, this assumption, especially when calculating the output relative humidity, introduces serious errors. The effects of the wet-side mass input rate and gas inlet pressure are not visible in their proposed equations. Chen and Peng proposed a thermodynamic model of a membrane humidifier, in which a third channel is installed in addition to the main inlet channels for dry and wet gases, controlling humidity or heat via a slide plate through airflow. They then studied non-permanent humidifiers and examined some dimensional parameters. Although Sub-Harval et al. studied the humidifier from a two-dimensional perspective, their results did not consider the heat transfer rate and output temperature in their parameter studies. Yu et al. also proposed an analytical model for parameterizing membrane humidifiers; although they provided the amount of liquid water produced in the humidifier during operation, in their parameter studies, only the dew point at the outlet was sufficient. Summary of the Invention

[0009] Based on this, it is necessary to propose a parameter control method, device, equipment, and storage medium for the performance of a membrane humidifier to address the above problems.

[0010] This invention provides a method for controlling parameters of a membrane humidifier's performance, the method comprising:

[0011] Based on the first law of thermodynamics, determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume, meteorological vapor, in the humidifier.

[0012] Based on the first law of thermodynamics, determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume, meteorological vapor, in the humidifier.

[0013] The water vapor transport rate through the membrane is determined based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time.

[0014] The inlet flow rate of the first control body and the inlet flow rate of the second control body are determined based on the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies in the humidifier, as well as the water vapor transmission rate through the membrane.

[0015] The humidifier's operating state is adjusted according to the water vapor transmission rate through the membrane, the inlet flow rate of the first control body, and the inlet flow rate of the second control body.

[0016] In the above scheme, the step of determining the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume vapor in the humidifier according to the first law of thermodynamics specifically includes: the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume vapor is as follows: In the formula,

[0017] The inlet steam mass flow rate of the first control unit. The outlet steam mass flow rate of the first control unit. The inlet air mass flow rate of the first control unit. The outlet air mass flow rate of the first control unit. The rate at which water vapor passes through the membrane. The heat transfer rate from the second control volume to the first control volume. For membrane enthalpy.

[0018] In the above scheme, the step of determining the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume vapor in the humidifier according to the first law of thermodynamics specifically includes: the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume vapor is as follows:

[0019] In the formula,

[0020] The inlet steam mass flow rate of the second control unit. The outlet steam mass flow rate of the second control unit. The inlet air mass flow rate of the second control unit. The outlet air mass flow rate of the second control unit. The rate at which water vapor passes through the membrane. The heat transfer rate from the second control volume to the first control volume. For membrane enthalpy.

[0021] In the above scheme, the method further includes determining, based on the mass survival equation, the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume's vapor, and the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume's vapor, that the mass flow rate difference between the inlet and outlet of the first control volume and the mass flow rate difference between the inlet and outlet of the second control volume are equal to the water vapor transport rate through the membrane, i.e. .

[0022] In the above scheme, the membrane temperature is determined according to the formula... Determine; in the formula, The outlet temperature of the first control unit. The outlet temperature of the second control unit.

[0023] In the above scheme, determining the water vapor transport rate through the membrane based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time specifically involves: according to the formula... Determine the water vapor transport rate through the membrane. In the formula, The molar mass of water, A Let the area be the membrane. D w The diffusion coefficient is... C 1 represents the water volume of the membrane near the first control body. C 2 represents the water volume near the membrane in the second control volume.

[0024] In the above scheme, the diffusion coefficient D w The relative humidity is determined based on the water film capacity, relative film length, relative humidity at the outlet of the first control body, and relative humidity at the outlet of the second control body. In the formula, For water diffusion capacity, ; This refers to the water film capacity.

[0025] This invention also provides a parameter control device for the performance of a membrane humidifier, the device comprising: a determining unit and a regulating unit;

[0026] The determining unit is used to determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first control body vapor in the humidifier, according to the first law of thermodynamics; it is also used to determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the second control body vapor in the humidifier, according to the first law of thermodynamics; it is also used to determine the water vapor transmission rate through the membrane based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time; and it is also used to determine the inlet flow rate of the first control body and the inlet flow rate of the second control body based on the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies vapor in the humidifier, as well as the water vapor transmission rate through the membrane.

[0027] The control unit is used to adjust the working state of the humidifier according to the water vapor transmission rate through the membrane, the inlet flow rate of the first control body, and the inlet flow rate of the second control body.

[0028] This invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the following steps:

[0029] Based on the first law of thermodynamics, determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume, meteorological vapor, in the humidifier.

[0030] Based on the first law of thermodynamics, determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume, meteorological vapor, in the humidifier.

[0031] The water vapor transport rate through the membrane is determined based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time.

[0032] The inlet flow rate of the first control body and the inlet flow rate of the second control body are determined based on the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies in the humidifier, as well as the water vapor transmission rate through the membrane.

[0033] The humidifier's operating state is adjusted according to the water vapor transmission rate through the membrane, the inlet flow rate of the first control body, and the inlet flow rate of the second control body.

[0034] This invention also provides a computer device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following steps:

[0035] Based on the first law of thermodynamics, determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume, meteorological vapor, in the humidifier.

[0036] Based on the first law of thermodynamics, determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume, meteorological vapor, in the humidifier.

[0037] The water vapor transport rate through the membrane is determined based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time.

[0038] The inlet flow rate of the first control body and the inlet flow rate of the second control body are determined based on the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies in the humidifier, as well as the water vapor transmission rate through the membrane.

[0039] The humidifier's operating state is adjusted according to the water vapor transmission rate through the membrane, the inlet flow rate of the first control body, and the inlet flow rate of the second control body.

[0040] The embodiments of the present invention have the following beneficial effects:

[0041] This invention can determine and establish optimal operating conditions for various applications of humidifiers and fuel cells. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] in:

[0044] Figure 1 This is a structural diagram of the thermodynamic model of a membrane humidifier in a parameter control method for the performance of a membrane humidifier in one embodiment;

[0045] Figure 2 This is a flowchart of a parameter control method for the performance of a membrane humidifier in one embodiment. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In one embodiment, a method for parameter control of the performance of a membrane humidifier is provided. This method is applied to a membrane humidifier, such as... Figure 1 As shown, this embodiment is illustrated by an application to a membrane humidifier. The airflow passes in opposite directions through the dry air channel (i.e., the first control body) and the wet air channel (i.e., the second control body), and water and heat are transferred from the wet channel to the dry channel through the membrane.

[0048] like Figure 2 As shown, the parameter control method specifically includes the following steps:

[0049] Step 101: Determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume meteorological vapor in the humidifier according to the first law of thermodynamics;

[0050] Specifically, the relationship for the membrane's transport rate is as follows: In the formula, The inlet steam mass flow rate of the first control unit. The outlet steam mass flow rate of the first control unit. The inlet air mass flow rate of the first control unit. The outlet air mass flow rate of the first control unit. The rate at which water vapor passes through the membrane. The heat transfer rate from the second control volume to the first control volume. For membrane enthalpy.

[0051] The film enthalpy The product of the specific heat of steam and water and the temperature of the membrane. In the formula, The specific heat of steam and water, It is the membrane temperature.

[0052] The membrane temperature is determined according to the formula. Sure;

[0053] In the formula, The outlet temperature of the first control unit. The outlet temperature of the second control unit.

[0054] According to the formula Determine the water vapor transport rate through the membrane. In the formula, The molar mass of water, A Let the area be the membrane. D w The diffusion coefficient is... C 1 represents the water volume of the membrane near the first control body. C 2 represents the water volume near the membrane in the second control volume.

[0055] The diffusion coefficient D w The relative humidity is determined based on the water film capacity, relative film length, relative humidity at the outlet of the first control body, and relative humidity at the outlet of the second control body. In the formula, For water diffusion capacity, ; This refers to the water film capacity.

[0056] Heat transfer rate from the second control unit to the first control unit In the formula, The temperature difference is the logarithmic mean. .

[0057] Overall heat transfer coefficient at Nusselt number In the formula, k The conductivity coefficient, N u For Nusselt numbers, D h It is the hydraulic diameter of the channel.

[0058] Step 102: Determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume meteorological vapor in the humidifier according to the first law of thermodynamics;

[0059] Specifically, the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume's meteorological steam is as follows: In the formula, The inlet steam mass flow rate of the second control unit. The outlet steam mass flow rate of the second control unit. The inlet air mass flow rate of the second control unit. The outlet air mass flow rate of the second control unit. The rate at which water vapor passes through the membrane. The heat transfer rate from the second control volume to the first control volume. For membrane enthalpy.

[0060] The film enthalpy The product of the specific heat of steam and water and the temperature of the membrane. In the formula, The specific heat of steam and water, It is the membrane temperature.

[0061] The membrane temperature is determined according to the formula. Sure;

[0062] In the formula, is the outlet temperature of the first control body, and is the outlet temperature of the second control body.

[0063] Heat transfer rate from the second control unit to the first control unit In the formula, The temperature difference is the logarithmic mean. .

[0064] Overall heat transfer coefficient at Nusselt number In the formula, k The conductivity coefficient, N u For Nusselt numbers, D h It is the hydraulic diameter of the channel.

[0065] Step 103: Determine the water vapor transport rate through the membrane based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time.

[0066] Specifically, according to the formula Determine the water vapor transport rate through the membrane. In the formula, The molar mass of water, A Let the area be the membrane. D w The diffusion coefficient is... C 1 represents the water volume of the membrane near the first control body. C 2 represents the water volume near the membrane in the second control volume.

[0067] The diffusion coefficient D w The relative humidity is determined based on the water film capacity, relative film length, relative humidity at the outlet of the first control body, and relative humidity at the outlet of the second control body. In the formula, For water diffusion capacity, ; This refers to the water film capacity.

[0068] In the formula, It is the relative membrane length.

[0069] In the formula, The relative humidity at the outlet of the first control unit. The relative humidity at the outlet of the second control unit.

[0070] , In the formula, , Let be the molar mass of air.

[0071] , In the formula, It is the dry film density. It is the equivalent dry weight of the membrane. To control the body's water volume, This is the second control body for water volume.

[0072]

[0073] Step 104: Determine the inlet flow rate of the first control body and the inlet flow rate of the second control body based on the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies in the humidifier, as well as the water vapor transmission rate through the membrane.

[0074] Specifically, by using Fortran programming software for iterative simulation and solving the above equations, a complete continuous thermodynamic model of the counter-current plate membrane humidifier can be established.

[0075] Step 105: Adjust the working state of the humidifier according to the water vapor transmission rate through the membrane, the inlet flow rate of the first control body, and the inlet flow rate of the second control body.

[0076] Furthermore, the method also includes determining, based on the mass survival equation, the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume's vapor, and the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume's vapor, that the mass flow rate difference entering and exiting the first control volume and the mass flow rate difference entering and exiting the second control volume are equal to the water vapor transport rate through the membrane. .

[0077] This invention can determine and establish optimal operating conditions for various applications of humidifiers and fuel cells.

[0078] As the inlet flow rate of the first control body increases, the relative humidity at the dry-side outlet decreases; however, due to the opposite effect of increased temperature, the downward slope of the curve is very low; therefore, when the flow rate is doubled, the relative humidity decreases by only 6%. Increasing the inlet flow rate of the dry side lowers the dew point at the dry-side outlet, which means that it has a drip-water moisturizing function.

[0079] With the increase of the inlet flow rate of the second control body, especially at high humidity gas flow rates, there is almost no effect on the relative humidity of the dry side outlet, but the dew point is increased, thereby improving the performance of the humidifier.

[0080] In one embodiment, a parameter control device for the performance of a membrane humidifier is provided, the device comprising: a determining unit and a regulating unit;

[0081] The determining unit is used to determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first control body vapor in the humidifier, according to the first law of thermodynamics; it is also used to determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the second control body vapor in the humidifier, according to the first law of thermodynamics; it is also used to determine the water vapor transmission rate through the membrane based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time; and it is also used to determine the inlet flow rate of the first control body and the inlet flow rate of the second control body based on the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies vapor in the humidifier, as well as the water vapor transmission rate through the membrane.

[0082] The control unit is used to adjust the working state of the humidifier according to the water vapor transmission rate through the membrane, the inlet flow rate of the first control body, and the inlet flow rate of the second control body.

[0083] In one embodiment, a computer device is provided, including a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the following steps:

[0084] Step 101: Determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume meteorological vapor in the humidifier according to the first law of thermodynamics;

[0085] Step 102: Determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume meteorological vapor in the humidifier according to the first law of thermodynamics;

[0086] Step 103: Determine the water vapor transport rate through the membrane based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time.

[0087] Step 104: Determine the inlet flow rate of the first control body and the inlet flow rate of the second control body based on the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies in the humidifier, as well as the water vapor transmission rate through the membrane.

[0088] Step 105: Adjust the working state of the humidifier according to the water vapor transmission rate through the membrane, the inlet flow rate of the first control body, and the inlet flow rate of the second control body.

[0089] In one embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, causes the processor to perform the following steps:

[0090] Step 101: Determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the first control volume meteorological vapor in the humidifier according to the first law of thermodynamics;

[0091] Step 102: Determine the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transport rate through the membrane at the inlet and outlet of the second control volume meteorological vapor in the humidifier according to the first law of thermodynamics;

[0092] Step 103: Determine the water vapor transport rate through the membrane based on the molar mass of water in the humidifier, the membrane area, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time.

[0093] Step 104: Determine the inlet flow rate of the first control body and the inlet flow rate of the second control body based on the relationship between the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate through the membrane at the inlet and outlet of the first and second control bodies in the humidifier, as well as the water vapor transmission rate through the membrane.

[0094] Step 105: Adjust the working state of the humidifier according to the water vapor transmission rate through the membrane, the inlet flow rate of the first control body, and the inlet flow rate of the second control body.

[0095] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method of parameter control of a performance of a membrane humidifier, characterized by, The method comprises: The relationship of the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate of the meteorological vapor at the inlet and outlet of the first control body in the humidifier is determined according to the first law of thermodynamics, specifically comprising: the relationship of the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate of the meteorological vapor at the inlet and outlet of the first control body is ; wherein, is the inlet steam mass flow rate of the first control body, is the outlet steam mass flow rate of the first control body, is the inlet air mass flow rate of the first control body, is the outlet air mass flow rate of the first control body, is the water vapor transmission rate through the membrane, is the heat transfer rate from the second control body to the first control body, is the membrane enthalpy. The relationship of the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate at the inlet and outlet of the second control body meteorological vapor in the humidifier determined according to the first law of thermodynamics, specifically comprises: the relationship of the mass flow rate, enthalpy, membrane enthalpy, and water vapor transmission rate at the inlet and outlet of the second control body meteorological vapor is ; in the formula, is the inlet steam mass flow rate of the second control body, is the outlet steam mass flow rate of the second control body, is the inlet air mass flow rate of the second control body, is the outlet air mass flow rate of the second control body, is the water vapor transmission rate through the membrane, is the heat transfer rate from the second control body to the first control body, is the membrane enthalpy, and the membrane enthalpy is the product of the specific heat of steam and water and the temperature of the membrane , in which, is the specific heat of steam and water, is the membrane temperature; determining the water vapor transmission rate through the membrane according to the molar mass of water in the humidifier, the area of the membrane, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time; determining the first control body inlet flow rate and the second control body inlet flow rate according to the relationship of the mass flow rate, the enthalpy, the membrane enthalpy, the water vapor transmission rate through the membrane at the inlet and the outlet of the meteorological vapor in the humidifier, and the water vapor transmission rate through the membrane; adjusting the working state of the humidifier according to the water vapor transmission rate through the membrane, the first control body inlet flow rate, and the second control body inlet flow rate; The method further includes determining that the difference in mass flow rate into and out of the first control volume and the difference in mass flow rate into and out of the second control volume is equal to the rate of transport of water vapor through the membrane based on the mass transport equation, the mass flow rates, the enthalpies, the membrane enthalpies, and the rate of transport of water vapor through the membrane at the inlet and outlet of the first control volume hydrometeor vapor and the inlet and outlet of the second control volume hydrometeor vapor, i.e. .

2. The method of claim 1, wherein the parameter is a flow rate of the humidified gas. The film temperature is determined according to the formula wherein is the outlet temperature of the first control volume, is the outlet temperature of the second control volume.

3. The method of claim 1, wherein the parameter of the performance of the membrane humidifier is controlled by: The transmission rate of water vapor through the membrane is determined according to the molar mass of water in the humidifier, the area of the membrane, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time, specifically according to the formula Determining the rate of water vapor transport through a membrane wherein Mw is the molar mass of water, A A is the area of the membrane, D w D is the diffusion coefficient, C 1 is the water capacity of the membrane close to the first control volume, C 2 is the water capacity of the membrane close to the second control volume.

4. The method of claim 3, wherein the parameter is a flow rate of the humidified gas. the diffusion coefficient D w determined from the water film capacity, the relative membrane length, the relative humidity at the outlet of the first control volume, the relative humidity at the outlet of the second control volume, i.e. where is the water diffusion capacity, ; is the water film capacity.

5. A parameter control device for the performance of a membrane humidifier, characterized by The device executes the method of any one of claims 1-4, and the device comprises a determination unit and a regulation unit. The determination unit is configured to determine the relationship of the mass flow rate, the enthalpy, the membrane enthalpy, and the water vapor transmission rate through the membrane at the inlet and the outlet of the meteorological vapor in the first control body in the humidifier according to the first law of thermodynamics, to determine the relationship of the mass flow rate, the enthalpy, the membrane enthalpy, and the water vapor transmission rate through the membrane at the inlet and the outlet of the meteorological vapor in the second control body in the humidifier according to the first law of thermodynamics, to determine the water vapor transmission rate through the membrane according to the molar mass of water in the humidifier, the area of the membrane, the diffusion coefficient, the water capacity on both sides of the membrane, and the diffusion time, and to determine the first control body inlet flow rate and the second control body inlet flow rate according to the relationship of the mass flow rate, the enthalpy, the membrane enthalpy, and the water vapor transmission rate through the membrane at the inlet and the outlet of the meteorological vapor in the humidifier, and the water vapor transmission rate through the membrane. The regulation unit is configured to adjust the working state of the humidifier according to the water vapor transmission rate through the membrane, the first control body inlet flow rate, and the second control body inlet flow rate. 6.A computer readable storage medium storing a computer program, wherein the computer program is executed by a processor to cause the processor to perform the steps of the method of any one of claims 1 to 4. 7.A computer device comprising a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to cause the processor to perform the steps of the method of any one of claims 1 to 4.

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