Dehumidification plate, dehumidification device and drying system based on metal organic framework materials

Abstract

The present invention relates to the field of material drying technology, and discloses a dehumidification plate, dehumidification device, and drying system based on metal-organic framework materials. The metal-organic framework-based dehumidification device plate of the present invention comprises a plate body and a frame. The plate body is made of a metal-organic framework material doped with a low critical solution temperature thermosensitive polymer. The plate body is arranged upright and provided with a drainage channel. The drainage channel converges and connects from the upper end of the plate body to the lower end of the plate body, and the lower end of the drainage channel is provided with a water outlet. The frame is disposed within the plate body and is capable of supporting the plate body. The dehumidification device plate can remove moisture from the exhaust gas of the drying material, allowing the exhaust gas to circulate waste heat, improve thermal efficiency, and reduce energy consumption for drying material regeneration or water vapor condensation.

Description

Technical Field

[0001] The present invention relates to the technical field of material drying, and in particular to a dehumidification plate, a dehumidification device and a drying system based on a metal organic framework material. Background Art

[0002] Drying generally refers to various operations that remove moisture or other moisture from wet materials. The purpose of drying is to facilitate storage, transportation, and use of the materials. Drying operations are widely used in various sectors, including the chemical industry, food industry, light industry, textiles, agricultural and forestry product processing, and building materials. While drying technology solves problems such as mold and deterioration and transportation difficulties, it also generates significant energy consumption. Within the entire industrial production structure, drying is one of the most energy-intensive processes, accounting for 10% to 15% of global industrial energy consumption.

[0003] During the drying process of the material, the exhaust gas discharged from the drying chamber has a certain amount of waste heat, but also contains a high amount of moisture. In the prior art, there is a dry chili drying device for the production of chili powder. The water vapor released from the device is discharged through the moisture removal holes. While achieving the drying effect, about 40% of the heat is not effectively utilized. If the moisture in the exhaust gas is removed and the waste heat is recycled, it will play a role in energy saving and consumption reduction. In industry, solid adsorbents such as silica gel and calcium chloride are used to remove moisture from water vapor, industrial gases or organic solutions, or in chemical production, hot air, flue gas, etc. are used to heat wet solid materials to remove moisture from the materials. However, the regeneration of solid adsorbents requires additional heat.

[0004] Regarding how to remove moisture and recycle waste heat, scholars have proposed different implementation methods. Patent CN208688207U is a cigarette dryer that uses silica gel material to dry the gas; Patent CN113008013A is a heating device for a dryer, which is equipped with a moisture absorption component and uses anhydrous calcium chloride particles to absorb moisture entrained in the air flow; Patent CN107218790A is a heat pump dehumidification and drying device, which uses the evaporator of the heat pump system to remove moisture, and the refrigerant of the condenser reheats the dehumidified air for recycling. Among the drying devices or drying technologies currently designed and manufactured, most of the technologies for recycling waste heat in the process of removing moisture from materials using thermal energy involve the use of desiccant and the condensation of exhaust gas, involving the regeneration of desiccant and the use of refrigerant and energy loss. Therefore, it is necessary to improve the existing material drying system. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention proposes a dehumidification plate, dehumidification device and drying system based on metal-organic framework materials. The dehumidification plate of the present invention can remove moisture from the exhaust gas, so that the exhaust gas can be recycled with waste heat, thereby improving thermal efficiency and reducing energy consumption for regeneration of drying materials or condensation of water vapor.

[0006] To achieve the above-mentioned purpose, the dehumidification plate based on metal organic framework material of the present invention includes a plate body and a frame, wherein the plate body is made of metal organic framework material doped with low critical solution temperature type thermosensitive polymer, the plate body is arranged upright, and a drainage channel is provided on the plate body, and the drainage channel is arranged to converge and connect from the upper end of the plate body to the lower end of the plate body, and a water outlet is provided at the lower end of the drainage channel; the frame is arranged in the plate body, and the frame can support the plate body.

[0007] During use, the waste gas after drying the material flows through the dehumidification plate and contacts the surface of the dehumidification plate. The metal-organic framework material on the dehumidification plate absorbs moisture from the waste gas, allowing it to be removed. No condensation treatment is required during the dehumidification process, and the temperature of the gas after dehumidification decreases slightly, allowing the waste gas to undergo waste heat circulation and improve thermal efficiency. During the water adsorption process, the water forms liquid water through capillary condensation within the pores of the metal-organic framework material. As the amount of gas being processed increases, the temperature of the dehumidification plate rises to the lower critical solution temperature of the thermosensitive polymer, causing the volume of the dehumidification plate material to shrink, releasing the adsorbed liquid water and discharging it through the drainage channel and outlet. After the temperature of the dehumidification plate exceeds the lower critical solution temperature of the thermosensitive polymer, the dehumidification plate can cool naturally at room temperature, restoring its dehumidification capacity and reducing energy consumption.

[0008] In one embodiment, the distribution shape of the drainage channel is like the veins of a leaf; each branch of the drainage channel can cause water droplets to generate a Laplace pressure difference force from the end away from the water outlet to the end close to the water outlet.

[0009] When the water flows on the drainage channel, the drainage channel causes the water to be simultaneously acted upon by the Laplace pressure difference force during the flow process, thereby increasing the convergent flow speed of the water and causing the water to flow out of the outlet faster.

[0010] In one embodiment, the skeleton is configured to correspond to the shape of the drainage channel and is embedded in the drainage channel.

[0011] In one embodiment, the surface of the skeleton has different wettability to water, and the contact angle of the water droplet on the surface of the skeleton gradually decreases from the end of the skeleton away from the water outlet to the end of the skeleton close to the water outlet.

[0012] The skeleton supports the plate body, making the dehumidification plate structure more stable. At the same time, the wettability difference on the surface of the skeleton forms a wettability gradient, which promotes the transport of liquid water along the drainage channel, allowing the water to flow out of the outlet faster.

[0013] In one embodiment, the plate body is further doped with thermally conductive particles having a thermal conductivity greater than that of the metal organic framework material.

[0014] The thermally conductive particles accelerate the transfer and absorption of heat by the dehumidification plate, allowing the thermosensitive polymer to reach the lower critical solution temperature faster and causing the metal-organic framework material to release the adsorbed liquid water.

[0015] In one embodiment, the low critical solution temperature thermosensitive polymer is poly(N-isopropylacrylamide), and the metal organic framework material is one or more of MOF-808 or MOF-801 or MOF-1 or MOF-303 or MOF-841 or MOF-802 or MOF-805 or MOF-806 or MOF-804 or UIO-66 or MIL-101 or MIL-53 or MIL-125.

[0016] The dehumidification device based on metal organic framework materials of the present invention includes a dehumidification chamber and a dehumidification plate based on metal organic framework materials according to any one of the above embodiments, wherein the dehumidification chamber is provided with an air inlet and an air outlet, the bottom of the dehumidification chamber is provided with a water collection tank, and one end of the water collection tank is provided with a drain outlet; the dehumidification plates are arranged at intervals in the dehumidification chamber, and the water outlet is connected to the water collection tank.

[0017] The metal-organic framework material-based drying system of the present invention includes a drying chamber, a circulating fan, an air heater, and the metal-organic framework material-based dehumidification device described in any one of the above embodiments, wherein the air outlet of the air heater is connected to the air inlet of the drying chamber, the exhaust port of the drying chamber is connected to the air inlet of the dehumidification chamber, the air outlet of the dehumidification chamber is connected to the air inlet of the circulating fan, and the air outlet of the circulating fan is connected to the air inlet of the air heater.

[0018] During operation, the air heater heats the air before sending it into the drying chamber. The exhaust gas from the dried material enters the dehumidification chamber of the dehumidifier to remove moisture. The dehumidified gas temperature drops minimally. Under the pressure of the circulating fan, the dehumidified gas reenters the air heater for heat replenishment. This allows the air to circulate waste heat throughout the drying system, improving its thermal efficiency. Once the temperature of the dehumidifier plate exceeds the lower critical solution temperature of the thermosensitive polymer, the plate cools naturally at room temperature, restoring its dehumidification capacity and further reducing energy consumption.

[0019] In one embodiment, the metal-organic framework material-based drying system further includes an air blower, a humidity sensor and a control valve, wherein the air outlet of the air blower is connected to the air inlet of the drying chamber, and the air inlet of the air blower is connected to the air outlet of the air heater and the exhaust outlet of the drying chamber; the humidity sensor and the control valve are arranged on the connecting pipeline between the drying chamber and the dehumidification chamber, and the signal of the humidity sensor is used to control the control valve and control the selective connection between the air inlet of the air blower and the exhaust outlet of the drying chamber.

[0020] The humidity sensor monitors the humidity of the exhaust gas flowing from the drying chamber into the dehumidification chamber. When the humidity of the exhaust gas is lower than the target value, the blower can send the exhaust gas discharged from the drying chamber back into the air inlet of the drying chamber so that the drying gas can be fully utilized.

[0021] In one embodiment, the metal-organic framework-based drying system further includes an air supply regulator connected to the air inlet of the air heater, and the air supply regulator can be selectively opened or closed according to the air pressure in the dehumidification chamber.

[0022] The air replenishment regulator replenishes air from the outside according to the air pressure in the dehumidification chamber, so that sufficient air can enter the drying chamber to dry the materials, thereby improving the energy utilization efficiency of the drying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0024] Figure 1 A schematic structural diagram of a dehumidification plate provided in one embodiment of the present invention;

[0025] Figure 2 A front view of a dehumidification device based on a metal organic framework material provided in one embodiment of the present invention;

[0026] Figure 3 for Figure 2 The left image of the dehumidification device based on metal-organic framework materials is shown;

[0027] Figure 4 A schematic structural diagram of a drying system based on a metal organic framework material according to an embodiment of the present invention;

[0028] Reference numerals:

[0029] 1-drying chamber, 2-circulation fan, 3-air heater, 4-air supply fan, 5-humidity sensor, 6-control valve, 7-air supply regulator;

[0030] 8-dehumidification device, 81-dehumidification chamber, 811-air inlet, 812-air outlet, 82-water collecting tank, 821-drainage outlet, 83-dehumidification plate, 831-plate body, 8311-drainage channel, 8312-water outlet, 832-skeleton, 84-partition. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0032] It should be understood that, in the description of the present invention, "plurality" means more than two, unless otherwise specifically defined. Unless otherwise specified and defined, the terms "installed," "connected," "connected," "fixed," and the like should be understood broadly. For example, they can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] See also Figures 1 to 3 In one embodiment, a dehumidification plate 83 based on a metal organic framework material includes a plate body 831 and a skeleton 832, which is used to dehumidify the exhaust gas after drying the material, can remove moisture from the exhaust gas, perform waste heat circulation, improve thermal efficiency, and reduce energy consumption for regeneration of drying materials or condensation of water vapor.

[0034] For details, please refer to Figure 1 The dehumidification plate 83 includes a plate body 831 and a skeleton 832. The plate body 831 is made of a metal organic framework material doped with a low critical solution temperature type thermosensitive polymer. The plate body 831 is arranged upright, and a drainage channel 8311 is provided on the plate body 831. The drainage channel 8311 is arranged to converge and connect from the upper end of the plate body 831 to the lower end of the plate body 831. A water outlet 8312 is provided at the lower end of the drainage channel 8311. The skeleton 832 is arranged in the plate body 831, and the skeleton 832 can support the plate body 831.

[0035] When the dehumidification plate 83 of this embodiment is in use, the waste gas after drying the material flows through the dehumidification plate 83 and contacts its surface. The metal-organic framework material on the dehumidification plate 83 absorbs moisture from the waste gas, allowing it to be removed. No condensation treatment is required during the dehumidification process, and the temperature of the dehumidified gas decreases minimally, allowing the waste gas to undergo waste heat circulation and improve thermal efficiency. During the moisture adsorption process, the water forms liquid water through capillary condensation within the pores of the metal-organic framework material. As the amount of gas processed increases, the temperature of the dehumidification plate 83 rises to the lower critical solution temperature of the thermosensitive polymer, causing the volume of the dehumidification plate material to shrink, releasing the adsorbed liquid water, which is then discharged through the drainage channel 8311 and the water outlet 8312. After the temperature of the dehumidification plate 83 exceeds the lower critical solution temperature of the thermosensitive polymer, the dehumidification plate 83 is allowed to cool naturally at room temperature, restoring its dehumidification capacity and reducing energy consumption.

[0036] It should be noted that metal-organic framework materials refer to crystalline porous materials with a periodic network structure formed by self-assembly of transition metal ions and organic ligands. In one embodiment, the metal-organic framework material is one or more of MOF-808, MOF-801, MOF-1, MOF-303, MOF-841, MOF-802, MOF-805, MOF-806, MOF-804, UiO-66, MIL-101, MIL-53, or MIL-125. Metal-organic framework materials can also be other metal-organic framework materials with high specific surface area and high porosity. Low critical solution temperature thermosensitive polymers are thermosensitive polymers with hydrophilic and hydrophobic groups on their molecular chains. When the material absorbs heat and rises to a certain temperature, the material shrinks in volume and undergoes a reversible hydrophilic-hydrophobic transition. In one embodiment, the low critical solution temperature thermosensitive polymer is poly(N-isopropylacrylamide). It is understandable that low critical solution temperature type thermosensitive polymers can also choose other materials according to the different exhaust gas temperatures. The plate body 831 can form the thermosensitive polymer and the powdered metal organic framework material into a plate-like structure through the template method. When the dehumidification plate 83 comes into contact with the exhaust gas, the hydrophilic groups on the thermosensitive polymer and the metal organic framework material adsorb water, and the water vapor adsorbed on the pore surface of the metal organic framework material is saturated and condensed, and seeps out as gravity and surface energy overcome the aggregation of water. When the temperature reaches the low critical solution temperature of the thermosensitive polymer, the thermosensitive polymer undergoes a phase change from hydrophilic to hydrophobic, and the volume shrinks, so that the liquid water is quickly discharged. It is discharged through the drainage channel 8311 and the water outlet 8312.

[0037] In one embodiment, the distribution of the drainage channel 8311 is shaped like leaf veins; the branches of the drainage channel 8311 are capable of generating a Laplace pressure differential force on water droplets from the end away from the water outlet 8312 to the end closer to the water outlet 8312. Specifically, the branches of the drainage channel 8311 form a conical structure (which can be a complete or incomplete cone) with a continuously increasing cross-sectional radius from the end away from the water outlet 8312 to the end closer to the water outlet 8312. For example, the branches of the drainage channel 8311 can be shaped like cactus thorns. As water droplets flow through the drainage channel 8311, the drainage channel 8311 simultaneously acts on the water droplets through the Laplace pressure differential force, increasing the convergence velocity of the water and allowing the water to flow more quickly into the sump 82. In one embodiment, the frame 832 is configured to correspond to the shape of the drainage channel 8311 and is embedded within the drainage channel 8311. Specifically, the skeleton 832 is arranged in a direction corresponding to each branch of the drainage channel 8311. In one embodiment, the surface of the skeleton 832 has different wettability to water. The contact angle of the water droplet on the surface of the skeleton 832 gradually decreases from the end of the skeleton 832 away from the water outlet 8312 to the end of the skeleton 832 close to the water outlet 8312. It can be understood that wettability is an important property of the solid surface, and wettability mainly depends on the size of the surface energy. When the surface energy of the solid is lower and the surface is more hydrophobic, the contact angle of the water droplet on the surface of the skeleton 832 is larger. Conversely, the higher the surface energy of the solid and the stronger the hydrophilicity, the smaller the contact angle of the water droplet on the surface of the skeleton 832. The different wettability of the surface of the skeleton 832 to water can be achieved by different degrees of roughness or different material coatings on the surface of the skeleton 832. The skeleton 832 supports the plate body 831, making the structure of the dehumidification plate 83 more stable. At the same time, the wettability differences on the surface of the skeleton 832 promote the formation of a wettability gradient, which in turn promotes the transport of liquid water along the drainage channel 8311, allowing the water to flow out of the outlet 8312 more quickly. The skeleton 832 can be formed using metal plate materials such as copper and aluminum through machining or other methods. In one embodiment, the drainage channel 8311 is configured as a multi-stage bifurcated structure in the direction opposite to its convergence direction. The skeleton 832 is correspondingly configured as a multi-stage bifurcated structure, and the wettability differences between adjacent bifurcated structures result in a contact angle difference of 8° to 12° between water droplets on the corresponding surfaces of the skeleton 832. The driving force exerted on water droplets between adjacent bifurcated structures of the skeleton 832 is more pronounced, which also facilitates the provision of a larger number of branches on the skeleton 832. The number of bifurcated stages of the skeleton 832 is coordinated with the wettability gradient between adjacent bifurcated structures, facilitating sufficient and rapid water collection.

[0038] In one embodiment, the plate 831 is also doped with thermally conductive particles having a thermal conductivity greater than that of the metal-organic framework material. These particles accelerate the transfer and absorption of heat by the dehumidification plate 83, allowing the thermosensitive polymer to reach its lower critical solution temperature more quickly, allowing the metal-organic framework material to release adsorbed liquid water. Preferably, the thermally conductive particles can be selected from metal microparticles with good thermal conductivity, such as gold nanoparticles, silver nanoparticles, and copper nanoparticles.

[0039] When the metal-organic framework-based dehumidification plate 83 is in use, the waste gas after drying the material flows through the dehumidification plate 83 and contacts the surface of the dehumidification plate 83. The metal-organic framework material on the dehumidification plate 83 absorbs moisture from the waste gas, allowing it to be removed. No condensation treatment is required during the dehumidification process, and the temperature of the dehumidified gas decreases slightly, allowing the waste gas to undergo waste heat circulation and improve thermal efficiency. During the moisture adsorption process, the moisture forms liquid water through capillary condensation within the pores of the metal-organic framework material. As the amount of gas processed increases, the temperature of the dehumidification plate 83 rises to the lower critical solution temperature of the thermosensitive polymer, causing the volume of the dehumidification plate material to shrink, releasing the adsorbed liquid water, which is then discharged through the drainage channel 8311 and the water outlet 8312. After the temperature of the dehumidification plate 83 exceeds the lower critical solution temperature of the thermosensitive polymer, the dehumidification plate 83 is allowed to cool naturally at room temperature, restoring its dehumidification capacity and reducing energy consumption.

[0040] See also Figures 1 to 3 In one embodiment of the present invention, a dehumidification device 8 based on metal organic framework materials includes a drying chamber 1 and a dehumidification plate 83 based on metal organic framework materials according to any one of the above embodiments. The dehumidification chamber 81 is provided with an air inlet 811 and an air outlet 812. A water collecting tank 82 is provided at the bottom of the dehumidification chamber 81, and a drain outlet 821 is provided at one end of the water collecting tank 82. The dehumidification plates 83 are arranged at intervals in the dehumidification chamber 81, and the water outlet 8312 is connected to the water collecting tank 82. Specifically, the waste gas after drying the material is sent into the dehumidification chamber 81 from the air inlet 811, and the dehumidification plate 83 contacts the waste gas for dehydration treatment, and the treated gas is sent out from the air outlet 812. In one embodiment, the dehumidification plates 83 are arranged in parallel and at intervals. The air inlet 811 and the air outlet 812 are relatively arranged on both sides of the extension direction of the gap of the dehumidification plate 83. After drying the material, the exhaust gas can disperse and flow into the gaps between the dehumidifying plates 83, increasing the contact area between the exhaust gas and the dehumidifying plates 83 and allowing the moisture in the exhaust gas to be fully absorbed and removed. In one embodiment, a partition is provided between the dehumidifying chamber 81 and the water collection tank 82. The lower end of the dehumidifying plate 83 extends through the partition into the water collection tank 82. The partition prevents the liquid water in the water collection tank 82 from evaporating again and entering the dehumidifying chamber 81, thereby improving the utilization efficiency of the dehumidifying plate 83.

[0041] See also Figures 1 to 4A metal-organic framework-based drying system according to one embodiment of the present invention includes a drying chamber 1, a circulating fan 2, an air heater 3, and a metal-organic framework-based dehumidification device 8 according to any of the above-described embodiments. The drying chamber 1 is configured according to the material being dried. The circulating fan 2, which can be a fan or blower, circulates air between the various devices.

[0042] See also Figure 4 Specifically, the air outlet of the air heater 3 is connected to the air inlet of the drying chamber 1, the exhaust port of the drying chamber 1 is connected to the air inlet 811 of the dehumidifying chamber 81, the air outlet 812 of the dehumidifying chamber 81 is connected to the air inlet of the circulating fan 2, and the air outlet of the circulating fan 2 is connected to the air inlet of the air heater 3. During operation, the air heater 3 first heats the air before sending it into the drying chamber 1. The exhaust gas after drying the material enters the dehumidifying chamber 81 of the dehumidifying device 8 to remove moisture. The temperature of the dehumidified gas decreases slightly. Under the pressure of the circulating fan 2, the dehumidified gas re-enters the air heater 3 to replenish heat for the next cycle. The amount of air lost during the cycle only requires a small amount of ambient air to be replenished, which is heated in the air heater 3 simultaneously with the dehumidified exhaust gas. Because the dehumidified exhaust gas has a certain amount of residual heat, the heating time in the air heater 3 is shortened, thereby improving the operating efficiency of the entire drying system. After the temperature of the dehumidifying plate 83 exceeds the lower critical solution temperature of the thermosensitive polymer, the dehumidifying plate 83 is allowed to cool naturally at room temperature, restoring its dehumidification capacity. Further reducing energy consumption. In one embodiment, the air heater 3 is a solar heater. This saves energy. In one embodiment, multiple dehumidifiers 8 are provided. These dehumidifiers 8 are arranged in parallel, and the drying chamber 1 and the circulating fan 2 can be connected to one or more dehumidifiers 8 simultaneously. With multiple dehumidifiers 8, some dehumidifiers 8 can be selected for dehumidification during operation, while others can naturally cool to restore dehumidification capacity, reducing energy consumption.

[0043] In one embodiment, a metal-organic framework-based drying system further includes a blower 4, a humidity sensor 5, and a control valve 6. The air outlet of the blower 4 is connected to the air inlet of the drying chamber 1, which is in turn connected to the air outlet of the air heater 3 and the exhaust outlet of the drying chamber 1. The humidity sensor 5 and the control valve 6 are disposed on the connecting pipe between the drying chamber 1 and the dehumidification chamber 81. The signal from the humidity sensor 5 is used to control the control valve 6 and selectively connect the air inlet of the blower 4 to the exhaust outlet of the drying chamber 1. The humidity sensor 5 monitors the humidity of the exhaust gas flowing from the drying chamber 1 into the dehumidification chamber 81. When the humidity of the exhaust gas is below a target value, the blower 4 can re-enter the exhaust gas discharged from the drying chamber 1 into the air inlet of the drying chamber 1, thereby fully utilizing the drying gas. Specifically, the control valve 6 can be an electrically or hydraulically controlled flow valve or an on-off valve. The blower 4 can be a fan or blower, etc. It will be appreciated that the control valve 6 and the blower 4, etc., can be controlled by a controller. The humidity sensor 5 can transmit the measured signal to the controller, and the controller can control the control valve 6 and the air blower 4 accordingly.

[0044] In one embodiment, the drying system based on metal organic framework materials further includes an air supplementary regulator 7. The air supplementary regulator 7 is connected to the air inlet of the air heater 3, and the air supplementary regulator 7 can be selectively turned on or off according to the air pressure in the dehumidification chamber 81. Specifically, a pressure sensor or other gas pressure testing device can be set in the dehumidification chamber 81, and the controller of the air supplementary regulator 7 controls the start and stop of the air supplementary regulator 7 through the signal of the pressure sensor or the gas pressure testing device. The air supplementary regulator can be an air pump or other equipment. The air supplementary regulator 7 replenishes air from the outside according to the air pressure in the dehumidification chamber 81, so that sufficient air enters the drying chamber 1 to dry the material, thereby improving the energy utilization efficiency of the drying system.

[0045] When the metal-organic framework-based drying system is in use, air heater 3 heats the air before feeding it into drying chamber 1. The exhaust gas from the dried material enters dehumidification chamber 81 of dehumidifier 8 to remove moisture. The dehumidified gas experiences a minimal temperature drop. Under the pressure of circulating fan 2, the dehumidified gas reenters air heater 3 for heat replenishment, allowing the air to circulate waste heat throughout the drying system, improving its thermal efficiency. Once the temperature of dehumidification plates 83 exceeds the lower critical solution temperature of the thermosensitive polymer, they cool naturally at room temperature, restoring their dehumidification capacity and further reducing energy consumption.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A dehumidification plate based on metal organic framework material, characterized in that: The invention comprises a plate body and a frame, wherein the plate body is made of a metal organic framework material doped with a low critical solution temperature type thermosensitive polymer, the plate body is arranged upright, and a drainage channel is provided on the plate body, the drainage channel is arranged to converge and communicate from the upper end of the plate body to the lower end of the plate body, and a water outlet is provided at the lower end of the drainage channel; the frame is arranged in the plate body, and the frame can support the plate body; The distribution shape of the drainage channels is shaped like leaf veins; each branch of the drainage channels can cause the water droplets to generate a Laplace pressure difference force from the end away from the water outlet to the end close to the water outlet; The plate body is also doped with heat-conducting particles having a thermal conductivity greater than that of the metal organic framework material.

2. The dehumidification plate based on metal organic framework material according to claim 1, characterized in that: The frame is arranged in a shape corresponding to the drainage channel and is embedded in the drainage channel.

3. The dehumidification plate based on metal organic framework material according to claim 2, characterized in that: The surface of the skeleton has different wettability to water, and the contact angle of the water droplet on the surface of the skeleton gradually decreases from the end of the skeleton away from the water outlet to the end of the skeleton close to the water outlet.

4. The dehumidification plate based on metal organic framework material according to claim 1, characterized in that The low critical solution temperature thermosensitive polymer is poly(N-isopropylacrylamide), and the metal organic framework material is one or more of MOF-808, MOF-801, MOF-1, MOF-303, MOF-841, MOF-802, MOF-805, MOF-806, MOF-804, UIO-66, MIL-101, MIL-53, or MIL-125.

5. A dehumidification device based on metal organic framework materials, characterized in that: It comprises a dehumidification chamber and a dehumidification plate based on a metal organic framework material according to any one of claims 1 to 4, wherein the dehumidification chamber is provided with an air inlet and an air outlet, a water collecting tank is provided at the bottom of the dehumidification chamber, and a drain outlet is provided at one end of the water collecting tank; the dehumidification plates are arranged at intervals in the dehumidification chamber, and the water outlet is connected to the water collecting tank.

6. A drying system based on metal organic framework materials, comprising a drying chamber, a circulating fan, and an air heater, characterized in that: It also includes a dehumidification device based on metal organic framework materials according to claim 5, the air outlet of the air heater is connected to the air inlet of the drying chamber, the exhaust port of the drying chamber is connected to the air inlet of the dehumidification chamber, the air outlet of the dehumidification chamber is connected to the air inlet of the circulation fan, and the air outlet of the circulation fan is connected to the air inlet of the air heater.

7. The drying system based on metal organic framework materials according to claim 6, characterized in that: It also includes an air blower, a humidity sensor and a control valve, the air outlet of the air blower is connected to the air inlet of the drying chamber, and the air inlet of the air blower is connected to the air outlet of the air heater and the exhaust outlet of the drying chamber; the humidity sensor and the control valve are arranged on the connecting pipeline between the drying chamber and the dehumidification chamber, and the signal of the humidity sensor is used to control the control valve and control the selective connection between the air inlet of the air blower and the exhaust outlet of the drying chamber.

8. The metal organic framework-based drying system according to claim 6 or 7, characterized in that: An air supply regulator is also included, which is connected to the air inlet of the air heater and can be selectively opened or closed according to the air pressure in the dehumidification chamber.

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