Multi-mode box humidity regulation and control system device based on precise humidity control electrolyte membrane

Abstract

The invention discloses a multi-mode box humidity regulation and control system device based on a precise humidity control electrolyte membrane, and relates to the technical field of electrolyte membrane humidity regulation and control. Comprising a box body, a temperature and humidity sensor is arranged in the box body, a direct-current voltage regulator and a single-chip microcomputer control system are arranged outside the box body, an electrolyte membrane assembly is arranged on the side wall of the box body, and the two ends of the electrolyte membrane assembly are connected with diodes in parallel; the electrolyte membrane assembly comprises a proton exchange membrane, and an anode catalyst layer, an anode diffusion layer, a cathode catalyst layer and a cathode diffusion layer which are sequentially arranged on the two sides of the proton exchange membrane respectively; wherein the working temperature and humidity interval of the electrolyte membrane assembly is-40 to 70 DEG C and 20% to 100% RH. According to the box humidity regulation and control device, the limitation of a humidity regulation and control system in the prior art is solved, efficient, accurate and multi-mode humidity control is achieved, the requirements of different application scenes can be met, and the box humidity regulation and control device has the advantages of being energy-saving, environmentally friendly and wide in application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of humidity control by electrolyte membranes, and in particular to a multi-mode box humidity control system device based on a precise humidity control electrolyte membrane. Background Art

[0002] Humidity control plays an increasingly important role in modern industrial production, storage of goods, and daily life. Although traditional dehumidification technologies, such as condensation dehumidification and rotary adsorption dehumidification, can meet the dehumidification needs to a certain extent, they often have problems such as complex structure, high energy consumption, and insufficient control accuracy. These technologies are particularly insufficient when dealing with small space and high-precision dehumidification needs, such as precision manufacturing processes, inside instruments and meters, and storage of valuables.

[0003] Electrolyte membrane dehumidification technology based on proton exchange membrane is an electrochemical active treatment method. By applying a low-voltage DC electric field (3V) on both sides of the electrolyte membrane, the water vapor on the anode side (dehumidification side) undergoes electrolysis reaction, and the generated H + The carried water molecules are transported through the electrolyte membrane to the cathode side (humidification side) to generate water vapor again. By controlling the direction of the electrolyte membrane dehumidification component, the purpose of dehumidification or humidification is achieved. The following is the specific working principle of the electrolyte membrane component. The side where the anode of the electrolyte membrane component is located is connected to the positive electrode of the power supply line. The water vapor in the air contacted by the side where the anode is located undergoes an electrolysis reaction, and the reaction (1) occurs: (1); The hydrogen ion H generated by formula (1) + The water molecules it carries pass through the proton exchange membrane under electroosmosis and reach the cathode side. - Through the circuit to the cathode side, the reaction (2) occurs, consuming oxygen and producing water, or generating trace amounts of hydrogen in (3): (2); (3); Through equations (1), (2) and (3), the air humidity in the space area facing the side where the anode is located is reduced, while the air humidity in the space area facing the side where the cathode is located is increased, thereby achieving the effect of regulating the humidity in the target area. That is, when the anode side faces the inside of the box and the cathode side faces the outside of the box, water molecules are transported from the inside of the box to the outside of the box, which is the dehumidification of the box; when the cathode side faces the inside of the box and the anode side faces the outside of the box, water molecules are transported from the outside of the box to the inside of the box, which is the humidification of the box.

[0004] As a new dehumidification technology, electrolyte membrane dehumidification technology does not condense water during the electrolyte dehumidification process. The electrolyte membrane dehumidification components are small and compact, suitable for assembly in the form of dehumidification modules according to different humidity targets and space requirements. The dehumidification rate can be accurately adjusted by adjusting the applied electric field to facilitate control. This technology shows great potential in solving the limitations of traditional dehumidification technology. However, with the development of high-tech, there is an increasing demand for the ability to adjust and control humidity over a larger range (i.e., a wide humidity control range) to meet the humidity control needs in different scenarios and conditions. Therefore, a multi-mode humidity control system is needed to meet different needs. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-mode box humidity control system device based on a precise humidity control electrolyte membrane, to solve the limitations of the humidity control system in the prior art, to achieve efficient, precise, multi-mode humidity control to meet the needs of different application scenarios, and to have the advantages of energy saving, environmental protection and broad application prospects.

[0006] To achieve the above-mentioned purpose, the present invention provides a multi-mode box humidity control system device based on a precise humidity control electrolyte membrane, comprising a box, a temperature and humidity sensor is provided inside the box, a DC voltage regulator and a single-chip control system are provided outside the box, the single-chip control system includes a micro single-chip computer and a power amplifier, an electrolyte membrane assembly is provided on the side wall of the box, and both ends of the electrolyte membrane assembly are connected in parallel with a diode; the electrolyte membrane assembly includes a proton exchange membrane and an anode catalyst layer, an anode diffusion layer and a cathode catalyst layer, a cathode diffusion layer are respectively arranged on both sides of the proton exchange membrane; wherein, the operating temperature and humidity range of the electrolyte membrane assembly is -40~70℃, 20%~100%RH.

[0007] Preferably, the box body is a single box body, a temperature and humidity sensor is provided inside the single box body, a DC voltage regulator and a single-chip control system are provided outside the single box body, and an electrolyte membrane assembly is embedded on the side wall of the single box body.

[0008] Preferably, the box is a double box, two temperature and humidity sensors are arranged inside the double box, a DC voltage regulator and a single-chip control system are arranged outside the double box, and an electrolyte membrane assembly is embedded between the walls of the double box.

[0009] Preferably, the box body is a single box body, a temperature and humidity sensor is arranged inside the single box body, a DC voltage regulator and a single-chip control system are arranged outside the single box body, and two electrolyte membrane assemblies are embedded on the side wall of the single box body.

[0010] Preferably, the anode catalyst layer is a catalyst of iridium dioxide and a proton conducting polymer doped with a hygroscopic inorganic filler, wherein, by mass percentage, iridium dioxide is 74%, the hygroscopic inorganic filler is 6%, and the proton conducting polymer is 20%.

[0011] Preferably, the hygroscopic inorganic filler is one of hygroscopic silicon dioxide and hygroscopic aluminum oxide; and the proton conducting polymer is perfluorosulfonic acid resin.

[0012] Preferably, the cathode catalyst layer is a catalyst of platinum carbon and a proton conducting polymer, wherein, by mass percentage, the platinum carbon accounts for 80% and the proton conducting polymer accounts for 20%.

[0013] Preferably, the anode diffusion layer is carbon paper or titanium mesh, and the cathode diffusion layer is carbon paper with a microporous layer, and the size of the micropores is 50 microns.

[0014] Preferably, the DC voltage regulator, the temperature and humidity sensor, the power amplifier, the electrolyte membrane assembly and the diode are all electrically connected to the single-chip control system.

[0015] Preferably, the single chip microcomputer control system is connected to a PC via a wire for remote monitoring and control, displaying data, and analyzing and displaying the data.

[0016] Therefore, the present invention provides a multi-mode box humidity control system device based on a precise humidity control electrolyte membrane. Compared with the existing humidity control technology, the electrolyte membrane humidity control combined with the multi-mode structure solution can solve the limitations of the humidity control system in the prior art and achieve efficient, precise and multi-mode humidity control. The system does not require an external water source and directly generates water molecules on the cathode side through electrochemical reactions, thereby achieving direct humidification. The system can operate at room temperature and pressure without the need for additional heating or refrigeration equipment, reducing energy consumption and environmental pollution. In the moisturizing system solution, the cathode of the electrolyte membrane assembly can also generate a small amount of hydrogen to achieve the effect of freshness preservation. In addition, by adjusting parameters such as voltage, precise control of humidity can be achieved to meet the humidity requirements of different scenarios. In addition to being able to work at room temperature (20-40°C), the device solution can withstand high temperatures up to 70°C and low temperatures down to -40°C. It can work normally at relative humidity of 20~100%, without damage, failure, frost or water freezing.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the experimental circuit diagram of the present invention; Figure 2 is a fuzzy temperature trend model of the temperature sensor of the present invention; Figure 3 It is a work flow chart of the humidity control system of the present invention; Figure 4 1 is a schematic structural diagram of a single-box single electrolyte membrane module humidity control device according to Example 1 of the present invention; Figure 5 This is a relative humidity change curve diagram of the single-box single electrolyte membrane module humidity control device within 14 hours according to Example 1 of the present invention; Figure 6 1 is a schematic structural diagram of a double-box single electrolyte membrane module humidity control device according to Embodiment 2 of the present invention; Figure 7 This is a curve diagram of relative humidity variation within 14 hours of humidification on the humidification box side of the double-box single electrolyte membrane module humidity control device of Example 2 of the present invention; Figure 8 This is a curve diagram of relative humidity variation during 48 hours of dehumidification on the dehumidification box side of the double-box single electrolyte membrane module humidity control device of Example 2 of the present invention; Fig. 9 This is a curve diagram of absolute humidity variation during 48 hours of dehumidification on the dehumidification box side of the double-box single electrolyte membrane module humidity control device of Example 2 of the present invention; Fig.10 1 is a schematic structural diagram of a single-box dual electrolyte membrane assembly humidity control device according to Embodiment 3 of the present invention; Fig.11 is a schematic structural diagram of an electrolyte membrane assembly of an apparatus of Embodiment 1-3 of the present invention; Fig.12 This is a relative humidity change curve diagram of the single-box dual electrolyte membrane module humidity control device of Example 3 of the present invention during humidification within 14 hours; Fig.13 This is a relative humidity change curve diagram of the single-box dual electrolyte membrane module humidity control device of Example 3 of the present invention during dehumidification within 96 hours; Fig.14 This is a graph showing the absolute humidity variation during dehumidification within 96 hours of the single-box dual electrolyte membrane module humidity control device of Example 3 of the present invention; Fig.15 It is a temperature and humidity curve diagram of the single-box dual-electrolyte membrane module humidity control device in Example 3 of the present invention under continuous cooling conditions; Fig.16 It is a temperature and humidity curve diagram of the single-box dual-electrolyte membrane module humidity control device under cyclic changing working conditions in Example 3 of the present invention; Reference numerals 1. Humidity control box; 2. DC voltage regulator; 3. Electrolyte membrane assembly; 4. Temperature and humidity sensor; 5. Single chip microcomputer control system; 6. Humidification box; 7. Dehumidification box; 8. Box; 9. Anode diffusion layer; 10. Anode catalyst layer; 11. Proton exchange membrane; 12. Cathode catalyst layer; 13. Cathode diffusion layer. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below by means of the accompanying drawings and embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Any other changes, modifications, substitutions, combinations, simplifications made without violating the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application and belong to the scope of protection of the present invention.

[0020] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0021] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0022] Unless otherwise specified in the present invention, the reagents, instruments, equipment, etc. used are the reagents, instruments and equipment commonly used by technicians in this field, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0023] The multi-mode cabinet humidity control device provided by the present invention is described below in conjunction with the embodiments and the experimental results of humidity control are verified.

[0024] The electrolyte membranes of the electrolyte membrane assemblies in the following embodiments are all sprayed with a catalyst and inorganic hygroscopic filler composite coating, wherein the composite coating specifically comprises: 74% catalyst particles, 20% proton conductive polymer, and 6% moisture-retaining inorganic filler. The diffusion layer is conductive carbon paper or titanium mesh, the titanium mesh is 100 microns thick, and the electrode is a titanium plate, 1 mm thick.

[0025] The electrolyte membrane used is Nafion-NR212 membrane, the proton conducting polymer used is perfluorosulfonic acid resin, Nafion ionomer with sulfonic acid group equivalent of 1100 g / eq, the moisture-retentive inorganic filler is SiO2, and the catalyst used is iridium dioxide particles loaded on the electrolyte membrane, with a catalyst size of 100 nm.

[0026] The single-chip control system uses STM32F103ZET6, which is based on the ARMCortex-M3 core structure, has a main frequency of up to 72MHz, built-in 128kB FLASH, 20kB RAM, and has rich peripherals such as USART and I2C, which meet the requirements of this design. The chip pin resource allocation of the STM32F103ZET6 single-chip control system is shown in Table 1.

[0027] Table 1 Chip pin resource allocation of single-chip microcomputer control system

[0028] Since the microcontroller cannot withstand the working current of the electrolyte membrane, a 1N5817 diode is selected to be reverse biased and connected in parallel at both ends of the electrolyte membrane. The maximum repetitive peak reverse voltage (Maximumrepetitivepeakreversevoltage) of the 1N5817 diode is 20V, and the maximum reverse current (@VDCTA=25℃Maximumreversecurrent) is 500μA. In the following embodiment, the 1N5817 diode provides current protection for the STM32F103ZET6 microcontroller.

[0029] The DHT20 temperature and humidity sensor is used, which supports a humidity range of 0-100%RH and a temperature range of -40-+80℃, and is suitable for measuring humidity, dew point and temperature. 2 C interface, the microcontroller control system can access its registers to obtain the temperature and humidity data of the current environment. In the embodiment, DHT20 requires I 2 C communication interface to transmit data, and voltage output requires DAC and ADC interface to transmit variable voltage.

[0030] The OPA541 power amplifier is selected, which belongs to the class A power amplifier, has small transient distortion and alternating distortion, simple circuit and convenient debugging. In the embodiment, the OPA541 receives the voltage output by the STM32 and amplifies the voltage to reach the working voltage of the adapted electrolyte membrane.

[0031] The present invention is divided into a front-end data acquisition end and a calculation processing end. The acquisition device uses STM32 as the core controller to obtain sensor data and perform data analysis and calculation to obtain relevant environmental parameters. Then, the voltage is sent to the OPA541 power amplifier through the DAC module, the 1N5817 diode is connected in parallel, and the electrolyte membrane assembly is connected to deliver voltage for humidity control. In addition, the current temperature and humidity data can be displayed in real time through the LED display of the PC. The experimental circuit diagram is as follows Figure 1 shown.

[0032] The program software that needs to be designed for the system is sensor reading and writing, communication module driving and data output, so as to realize data collection, internal transmission and output. After the system is powered on, the peripherals are initialized first, and then the STM32 obtains the sensor data through the communication bus. After obtaining the data, the data is processed to obtain the output voltage value corresponding to the required dehumidification rate. After the processing is completed, the voltage is transmitted to the OPA541 power amplifier through the DAC module, and the voltage is added to the dehumidification sheet.

[0033] STM32 through I 2 The C bus exchanges data with the DHT20 temperature and humidity sensor, so the program has I 2 It consists of two parts: C bus driver and DHT20 reading and writing. 2 C driver code includes I 2 C initialization, start, end, ACK and read and write functions. 2 After the C bus configuration is completed, the internal register of DHT20 is accessed to obtain the original data and perform corresponding conversion according to the conversion formula. After the data is obtained, it is handed over to the processing end.

[0034] The DAC module converts the input digital code into the corresponding analog voltage for output. According to the design requirements of this article, STM32 analyzes the dehumidification state through the received temperature and humidity data, obtains the corresponding digital code, converts it into analog voltage for output, and sends it to the OPA541 power amplifier. In the OPA541, the input voltage signal is amplified, and then connected to the two ends of the electrolyte membrane assembly to transmit the voltage to the electrolyte membrane assembly.

[0035] This system uses STM32F103ZET6 microcontroller as the core of embedded system development, and cooperates with OPA541 power amplifier, regulated DC power supply, DHT20 temperature and humidity sensor and 1N5817 diode to build the back-end circuit. At the same time, it realizes the interface communication with the PC to achieve more flexible data processing. The effective reaction area of ​​the electrolyte membrane assembly is 12.25cm 2(3.5cm×3.5cm). The experimental object is an acrylic box (20cm×20cm×15cm), and an electrolyte membrane is installed on the wall of the box. The top cover of the box has a sealing strip and can be switched. The DHT20 temperature and humidity sensor module supports a humidity range of 0-100%RH and a temperature range of -40~+80℃, which is suitable for measuring temperature and humidity. OPA541 receives the voltage output by STM32, amplifies the voltage, and transmits it to both ends of the electrolyte membrane. In the experiment, since the microcontroller may not be able to withstand the working current of the electrolyte membrane, the 1N5817 diode is reverse biased and connected in parallel at both ends of the electrolyte membrane to protect the STM32 microcontroller from current. In order to obtain real-time data, the micro-microcontroller is connected to a computer to transmit data in real time. The system realizes dynamic control of humidity in the box, so it can more effectively cope with temperature changes outside the system.

[0036] Software Design of Humidity Control System 1. Humidity conversion formula In order to control the relative humidity to be stable under the condition of temperature change, and in the box, the relative humidity has a tendency to change with the temperature, the conversion between absolute humidity and relative humidity is more important. Absolute humidity is related to temperature and relative humidity.

[0037] The Magnus formula is an empirical formula commonly used to calculate the saturated water vapor pressure (Saturation Vapor Pressure). Its form is as shown in formula (1).

[0038] (1) Where P represents the saturated water vapor pressure (in Pascals), e is a natural constant, its value is approximately 2.718, T represents temperature (in degrees Celsius), A , B , C is the empirical fitting constant. In atmospheric physics, the commonly used Magnus formula constant is A =6.11hPa, B =17.2694, C =237.3℃.

[0039] The saturated water vapor pressure is converted into saturated water vapor density, as shown in formula (2).

[0040] (2) in, rho represents the saturated water vapor density (in g / m³), P represents the saturated water vapor pressure (in Pascals), M represents the molar mass of water (in grams / mole g / mol), Rrepresents the gas constant (in J / mol·K), T Indicates temperature (in degrees Celsius). M =18.01528 g / mol, R =8.31447J / mol·K.

[0041] 2. Humidity control system control process Fuzzy PID algorithms are divided into two types: positional and incremental. Positional PID controllers are suitable for control tasks with slow response speed and high requirements for system stability. They can process according to the error signal, eliminate or reduce the steady-state error of the system, and provide a relatively smooth control output, making the system run more stably. Incremental PID controllers are suitable for control tasks with fast response speed and high requirements for system robustness. They process according to the error change rate and can quickly adjust the control output to respond to external interference and emergencies, providing a more sensitive control effect. Positional PID algorithms are divided into three links: proportional, integral, and differential. In the control link, proportional control acts on the current error, integral control eliminates steady-state errors, and differential control eliminates transient errors. Combined with a more appropriate specific ratio, the error is reduced and tends to the target value. The proportional part calculates the output control amount according to the current error value, multiplies the error signal by the proportional gain constant, and obtains the actual control amount to improve the response efficiency. The integral part reads the error value in batches to obtain the sum of the error values, which is used to adjust the output value, thereby weakening the steady-state error. The differential part adjusts the output control amount according to the rate of change of the error signal, and selects the difference between the two output values ​​and the target value as the rate of change of the error to weaken overshoot and oscillation and improve the stability and response speed of the system. The proportional, integral and differential parts are combined to express the control amount of the output value, as shown in formula (3).

[0042] (3) Among them, K P is the proportional coefficient. Proportional control can quickly respond to errors, thereby reducing steady-state errors. i Is the integral coefficient. The function of integral control is that when there is an error in the system, the integral controller will continuously accumulate and output the control amount to eliminate the error. K d is the differential coefficient. Differential control can reduce overshoot, overcome oscillation, improve the stability of the system, speed up the dynamic response of the system, and reduce the adjustment time. e(k) is the humidity error, which is used to measure the difference between the actual humidity value in the box and the target humidity value.

[0043] During the external cooling process, considering the sensitivity of the temperature sensor and the fluidity of the air, the temperature value will fluctuate significantly, which may easily lead to misjudgment of the state. A fuzzy temperature trend model based on the external temperature is proposed. The principle is as follows Figure 2 shown.

[0044] Among them, tout(t) is the real-time external temperature, TEM is an array containing 21 elements, dTEM represents the i-th element minus the i+1-th element in TEM, and vol0 represents the voltage constant in the cooling stage.

[0045] TEM[0] represents the temperature at the earliest time point, and TEM

[20] represents the temperature at the latest time point. The dTEM array represents the temperature change at adjacent time points. dTEM[0] represents the temperature difference between the 0th time point and the 1st time point, dTEM[1] represents the temperature difference between the 1st time point and the 2nd time point, and so on. By calculating the temperature difference at adjacent time points, the temperature change trend can be obtained.

[0046] Considering the time-varying temperature and humidity of the experimental measurement points and the hysteresis of humidity regulation, when the accumulated past errors are too large, the integral link will be "saturated", which can easily lead to the system overshoot and failure to converge. This device adopts a box humidity control system for the electrolyte membrane, and realizes the voltage automatic control scheme that changes with the humidity in the box by adopting an anti-saturation integral fuzzy PID algorithm. The specific control principle is as follows: (1) When the current humidity error e(k) (humidity error is defined as the absolute value of the difference between the actual humidity and the humidity set value divided by the humidity set value) is greater than 3%, the integral control link is abandoned. Under the regulation of the proportional link, the system can make the current humidity value quickly approach the target value, and the differential link can suppress the large fluctuations that may be caused by the proportional link.

[0047] (2) When the current humidity error e(k) is less than 3%, the regulating effect of the proportional integral is weakened, and the sensitivity of the differential link to humidity increases. The integral link is reintroduced to gradually eliminate the steady-state error, and a saturation limit is imposed on the integral domain of the integral link to prevent overshoot caused by excessive accumulation of errors and shorten the time it takes for the system to enter a stable state.

[0048] Considering that the temperature difference between day and night and the change of ambient temperature will cause the temperature in the humidity control box to change, resulting in the instability of the relative humidity in the dehumidification box. Therefore, when the humidity error e(k) is greater than 0 and the continuous decrease or increase of the temperature in the dehumidification box is detected, the internal environment is dehumidified or humidified in advance to reach the target state faster.

[0049] At the same time, in order to prevent the voltage from exceeding the safe working range, a safety threshold is set for the system output to ensure that the electrolyte membrane is in a safe working state. The system's workflow under the separation fuzzy algorithm control based on internal and external temperature and humidity is as follows Figure 3 shown.

[0050] In addition to being able to work at room temperature (20-40°C), the above-mentioned device solution can withstand high temperatures as high as 70°C and low temperatures as low as -40°C. It can work normally at a relative humidity of 20~100% without any problems such as damage, failure, frost or water freezing.

[0051] The DC voltage regulator, electrolyte membrane assembly, temperature and humidity sensor and single-chip control system used in the following embodiments are all the same.

[0052] Example 1 This embodiment provides a humidification control device with a single humidity control box and a single electrolyte membrane module. The device structure is as follows: Figure 4 As shown, it includes a humidity control box 1, a temperature and humidity sensor 4 is arranged inside the humidity control box 1, and a DC voltage regulator 2 and a single-chip control system 5 are arranged outside the humidity control box 1. An electrolyte membrane assembly 3 is embedded in the side of the humidity control box 1, and the structure is as follows Fig.11 As shown, it includes a proton exchange membrane 11 and an anode catalyst layer 10, an anode diffusion layer 9 and a cathode catalyst layer 12, and a cathode diffusion layer 13 respectively arranged on both sides of the proton exchange membrane 11. The cathode side with humidification function faces the inside of the humidity control box for humidification, and the cathode side is connected to the negative pole of the power supply line. The anode side faces the outside of the humidity control box, and the anode side is connected to the positive pole of the power supply line. The temperature and humidity sensor sends the collected temperature information and humidity information in the humidity control box to the single-chip control system, and adjusts the DC voltage regulator voltage according to the collected temperature and humidity information. If the humidity in the box deviates greatly from the set value, the power of the electrolyte dehumidification component is controlled to increase the humidification efficiency. This humidity control device is suitable for scenes that require a higher humidity environment, such as the storage of fruits and vegetables. Compared with normal temperature, the air water vapor capacity is lower in a low temperature environment, and the drying problem is more prominent. At the same time, a small amount of hydrogen will be produced on the cathode side of the electrolyte membrane assembly. Hydrogen, as a preservative, mainly slows down the rate of food deterioration through its antioxidant properties. In cryopreservation, hydrogen can accelerate the freezing process, reduce ice crystal formation and oxidative stress, thereby maintaining the original nutritional value and quality of food.

[0053] The single-box electrolyte membrane humidification box is used in high humidity scenarios, so it only has a humidification function. The performance of the box humidity humidification device is verified. The results are as follows Figure 5 As shown. Figure 5It can be seen that under a 5°C environment, when the relative humidity of the external environment is 80%RH and 40%RH respectively, and the DC voltage regulator of the single-box electrolyte membrane humidification device is controlled at 3V, the humidity changes in the humidification box under static air conditions using the carbon paper device. It can be seen from the figure that when the external environment humidity is 80%RH, the humidity in the humidity control box can increase from 30%RH to 80%RH and remain stable after running for 840min. When the external environment humidity is 40%RH, the humidity in the humidification box can reach 70%RH and remain stable after running for 7.5h.

[0054] Example 2 This embodiment provides a double-box single electrolyte membrane module humidity control device, the device structure is as follows Figure 6 As shown, it includes a humidification box 6 and a dehumidification box 7, each of which has a temperature and humidity sensor 4, a DC voltage regulator 2 and a single-chip control system 5 on the surface of the dehumidification box 7, and an electrolyte membrane assembly 3 between the walls of the humidification box 6 and the dehumidification box 7, and the cathode side of the electrolyte membrane assembly faces the humidification box, which is used to increase the humidity of the box. The anode side of the electrolyte membrane assembly faces the dehumidification box, which is used to reduce the internal humidity of the box. The sensor and the sensor collect temperature and humidity information and send it to the single-chip control system. The single-chip control system changes the working power of the electrolyte membrane assembly by adjusting the voltage of the DC voltage regulator, thereby controlling the internal humidity of the two boxes. This humidity control device can provide both low humidity and high humidity environments at the same time.

[0055] The double-chamber electrolyte membrane humidity control box can provide both low humidity and high humidity environments. In order to improve the performance of the humidity control box under low humidity, the titanium mesh component is used in this device. When the external humidity is low, the humidification speed of the titanium mesh device is faster than that of the carbon paper device. This is mainly because under low humidity conditions, water molecule mass transfer is the main reaction rate-limiting step. Strengthening water molecule mass transfer under low humidity can significantly increase the reaction rate. Figure 7 The figure shows the relative humidity changes in the humidification box of the humidity control device when the external humidity is 40%RH and 80%RH respectively. As can be seen from the figure, when the external environment humidity is 80%RH, the humidity in the humidification box can increase from 30%RH to 74.8%RH after running for 55 minutes, and then the humidity slowly rises and remains at 80%RH. When the external environment humidity is 40%RH, the humidity in the humidity control box can reach 70%RH after running for 213 minutes.

[0056] Figure 8 and Fig. 9The changes in relative humidity and absolute humidity in the humidity control box and dehumidification box are shown respectively. During the dehumidification process, the average temperature is 22°C. When dehumidification starts, the average relative humidity in the box is 94.5%RH and the moisture content is 15.7g / kg. After the power is turned on, the humidity in the box drops rapidly. After 24 hours, the moisture content in the box drops to 8.34g / kg, which is 7.36g / kg lower than the initial value, and the relative humidity drops to 49.8%RH.

[0057] Example 3 This embodiment provides a single-box dual electrolyte membrane module humidity control device, the device structure is as follows Fig.10 As shown, there is a temperature and humidity sensor 4 inside the box 8, a DC voltage regulator 2 and a single-chip control system 5 outside the box 8, and two electrolyte membrane assemblies 3 are embedded on the side of the box 8, wherein the anode side of one electrolyte membrane assembly faces the inside of the box, which is used to humidify the air inside the box, and the cathode side of the other electrolyte membrane assembly faces the inside of the box, which is used to dehumidify the air inside the box. The temperature and humidity sensor sends the collected temperature and humidity information to the single-chip control system, and the single-chip control system adjusts the voltage of the DC voltage regulator according to the collected temperature and humidity information and the set humidity value, and controls the working power of the two electrolyte membrane assemblies. When the humidity value in the box is greater than the set value, the electrolyte membrane assembly works, while the electrolyte membrane assembly does not work, achieving the purpose of dehumidification in the box. When the humidity value in the box is less than the set value, the electrolyte membrane assembly works, while the electrolyte membrane assembly does not work, achieving the purpose of humidification in the box. This humidity control device has a wide humidity control range, and the response is fast and easy to control. It is suitable for working scenarios with complex and precise humidity requirements. For example, in the preservation of cultural relics, different cultural relics have different requirements for humidity.

[0058] The single-box dual-component humidity control device can achieve precise humidity control. Figure 12-14 It can be seen that if the humidification membrane electrode assembly is turned on alone, the humidity control box can humidify from a low humidity of 30%RH to a high humidity of 80%RH within 4 hours and keep it stable. If the dehumidification membrane electrode assembly is turned on alone, the humidity control box can reduce the humidity in the box to 30%RH within 12 hours and keep it stable. By controlling the voltage of the humidification membrane electrode assembly and the dehumidification membrane electrode assembly through the single-chip microcomputer, precise humidity control can be achieved in the range of 30%RH low humidity to 80%RH high humidity.

[0059] In order to study the regulation ability of the humidity control system at different temperatures, the humidity changes under continuous cooling conditions were tested, such as Fig.15As shown. In the first stage from 30℃ to 20℃, the system reached the relative humidity peak of 67.9% in about 500s, completed the first stage of dehumidification at 2400s, and the energy consumption was about 6.1J. Compared with the uncontrolled working condition, the dehumidification time was reduced by 14.2%, the humidity range was reduced by 4.8%, and the energy consumption was reduced by 23.0%. In the second stage from 20℃ to 10℃, the system reached the relative humidity peak of 68.7% at 3300s and reached the target value at 7750s. The energy consumption was about 15.1J, and the humidity control accuracy was ±0.4%RH. Compared with the uncontrolled working condition, the dehumidification time was reduced by 20.1%, the humidity range was reduced by 3.3%, and the energy consumption was reduced by 15.3%. Overall, compared with the uncontrolled working condition, the dehumidification time was reduced by 18.4%, the dehumidification rate was increased by 23.5%, the energy consumption was reduced by 19.2%, and the humidity control accuracy was ±0.4%RH. In the first stage when the temperature drops from 30℃ to 20℃, the initial relative humidity is lower than the target value, the system dehumidifies in advance, and the control effect is good. In the second stage when the temperature drops from 20℃ to 10℃, the dehumidification rate is significantly improved under the anti-saturation integral separation PID control.

[0060] In order to verify the universality of the humidity control system, the humidity control under temperature cycle changes was studied by simulating the scenarios of greenhouses and laboratories that need to maintain constant humidity during daily day and night temperature changes. Fig.16 As shown in the figure, in the first stage from 30℃ to 20℃, the system reaches the relative humidity peak of 69.1% at about 650s, reaches the target value at 4000s, and the energy consumption is about 9.8J. Compared with the uncontrolled working condition, the dehumidification time is reduced by 23.1%, the humidity range is reduced by 22.2%, and the energy consumption is reduced by 27.4%. At 5400s, the temperature is 30.6℃ and the humidity is 49.3%, and the second stage of dehumidification begins. The relative humidity peak is 66% at 6200s and the target value is reached at 9000s. The energy consumption is about 7.8J, and the humidity control accuracy is ±0.5%RH. Compared with the uncontrolled working condition, the dehumidification time is reduced by 38.5%, the humidity range is reduced by 8.2%, and the energy consumption is reduced by 45.7%. Overall, in the cyclic fluctuation working condition, the dehumidification time of the system is reduced by 31.2%, the energy consumption is reduced by 36.6%, and the humidity control accuracy is ±0.5%RH. In both stages, the humidity curves under system control were significantly better than those under uncontrolled conditions. The experiment showed that the humidity control system under system control was more stable and faster, and improved the time lag problem of humidity control under temperature changes.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A multi-mode box humidity control system device based on a precise humidity control electrolyte membrane, characterized in that: It includes a box body, a temperature and humidity sensor is arranged inside the box body, a DC voltage regulator and a single-chip control system are arranged outside the box body, the single-chip control system includes a micro single-chip computer and a power amplifier, an electrolyte membrane assembly is arranged on the side wall of the box body, and both ends of the electrolyte membrane assembly are connected in parallel with the diode; the electrolyte membrane assembly includes a proton exchange membrane and an anode catalyst layer, an anode diffusion layer and a cathode catalyst layer, and a cathode diffusion layer are arranged on both sides of the proton exchange membrane in sequence; wherein, the operating temperature and humidity range of the electrolyte membrane assembly is -40~70℃, 20%~100%RH.

2. According to claim 1, a multi-mode box humidity control system device based on a precise humidity control electrolyte membrane is characterized in that: The box body is a single box body, a temperature and humidity sensor is arranged inside the single box body, a DC voltage regulator and a single-chip control system are arranged outside the single box body, and an electrolyte membrane assembly is embedded on the side wall of the single box body.

3. According to claim 1, a multi-mode box humidity control system device based on a precise humidity control electrolyte membrane is characterized in that: The box is a double box, two temperature and humidity sensors are arranged inside the double box, a DC voltage regulator and a single-chip control system are arranged outside the double box, and an electrolyte membrane assembly is embedded between the walls of the double box.

4. According to claim 1, a multi-mode box humidity control system device based on a precise humidity control electrolyte membrane is characterized in that: The box body is a single box body, a temperature and humidity sensor is arranged inside the single box body, a DC voltage regulator and a single-chip control system are arranged outside the single box body, and two electrolyte membrane assemblies are embedded on the side wall of the single box body.

5. A multi-mode box humidity control system device based on a precise humidity control electrolyte membrane according to any one of claims 1 to 4, characterized in that: The anode catalyst layer is a catalyst of iridium dioxide and a proton conductive polymer doped with a moisture-absorbing inorganic filler, wherein, by mass percentage, iridium dioxide accounts for 74%, the hygroscopic inorganic filler accounts for 6%, and the proton conductive polymer accounts for 20%.

6. A multi-mode box humidity control system device based on a precise humidity control electrolyte membrane according to claim 5, characterized in that: The hygroscopic inorganic filler is one of hygroscopic silicon dioxide and hygroscopic aluminum oxide; the proton conductive polymer is perfluorosulfonic acid resin.

7. A multi-mode box humidity control system device based on a precise humidity control electrolyte membrane according to any one of claims 1 to 4, characterized in that: The cathode catalyst layer is a catalyst of platinum carbon and a proton conducting polymer, wherein, by mass percentage, the platinum carbon accounts for 80% and the proton conducting polymer accounts for 20%.

8. A multi-mode box humidity control system device based on a precise humidity control electrolyte membrane according to any one of claims 1 to 4, characterized in that: The anode diffusion layer is carbon paper or titanium mesh, and the cathode diffusion layer is carbon paper with a microporous layer, and the size of the micropores is 50 microns.

9. A multi-mode box humidity control system device based on a precise humidity control electrolyte membrane according to any one of claims 1 to 4, characterized in that: The DC voltage regulator, the temperature and humidity sensor, the power amplifier, the electrolyte membrane assembly and the diode are all electrically connected to the single chip control system.

10. A multi-mode box humidity control system device based on a precise humidity control electrolyte membrane according to any one of claims 1 to 4, characterized in that: The single-chip microcomputer control system is connected to a PC via wires for remote monitoring and control, display of data, and analysis and display of the data.

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