Adsorption bed and adsorption member thereof

Abstract

This invention discloses an adsorption component for an adsorption bed, comprising a heat transfer conductor and an adsorbent portion disposed on one side of the heat transfer conductor along the heat transfer direction. The adsorbent portion includes a first adsorbent portion and a second adsorbent portion sequentially arranged along the heat transfer direction of the heat transfer conductor. The first adsorbent portion is disposed between the second adsorbent portion and the heat transfer conductor. The temperature drive of the first adsorbent portion in the desorption state is higher than that of the second adsorbent portion in the desorption state, and / or the temperature drive of the first adsorbent portion in the adsorption state is lower than that of the second adsorbent portion in the adsorption state. This better adapts to the temperature difference generated in the heat transfer direction, making desorption or adsorption tend to be synchronized, thereby improving the overall desorption efficiency or adsorption efficiency. This adsorption component for an adsorption bed can effectively solve the problem of the need to improve the working efficiency of adsorption components. This invention also discloses an adsorption bed.

Description

Technical Field

[0001] This invention relates to the field of adsorption refrigeration technology, and more specifically, to an adsorption component for an adsorption bed, and to an adsorption bed including the above-mentioned adsorption component. Background Technology

[0002] Adsorption refrigeration systems mainly consist of an adsorption bed, an evaporator, and a condenser. The working principle of an adsorption refrigeration system is based on the adsorption capacity of solid adsorbents (such as zeolite, activated carbon, etc.) for certain refrigerant vapors (such as water, methanol, etc.). Heating the adsorbent causes the refrigerant in the adsorbent to desorb, and the desorbed vapor releases heat and condenses into liquid in the condenser. Cooling the adsorbent allows it to regain its adsorption capacity, and the adsorption causes the refrigerant liquid in the evaporator to evaporate. The evaporation in the evaporator absorbs heat, thus achieving refrigeration.

[0003] As the core component of an adsorption refrigeration system, the adsorption bed is the site where the adsorbent undergoes adsorption and desorption reactions, and its heat and mass transfer performance affects the overall performance of the adsorption refrigeration system.

[0004] In the process of realizing this invention, the inventors discovered that the prior art has at least the following problems: due to the strong coupling of mass transfer and heat transport in the adsorption bed, it is difficult to quantitatively determine the limitations of the transport process. The prior art does not disclose or provide guidance on quantitative comparison methods for the mass and heat transfer performance balance of the adsorption bed, or on how to design more effective adsorbent heat exchangers based on the heat and mass transfer limitations of the adsorbent material, which leads to the problem that the working efficiency of the adsorption components still needs to be improved. Summary of the Invention

[0005] In view of this, the first objective of the present invention is to provide an adsorption component for an adsorption bed that can address the problem of insufficient working efficiency of adsorption components, and the second objective of the present invention is to provide an adsorption bed including the above-described adsorption component.

[0006] To achieve the first objective mentioned above, the following technical solution is provided:

[0007] An adsorption component for an adsorption bed includes a heat transfer conductor and an adsorbent portion disposed on one side of the heat transfer conductor along the heat transfer direction. The adsorbent portion includes a first adsorbent portion and a second adsorbent portion sequentially disposed along the heat transfer direction of the heat transfer conductor. The first adsorbent portion is disposed between the second adsorbent portion and the heat transfer conductor. The temperature drive of the first adsorbent portion in the desorption state is higher than that of the second adsorbent portion in the desorption state, and / or the temperature drive of the first adsorbent portion in the adsorption state is lower than that of the second adsorbent portion in the adsorption state.

[0008] In the desorption state, the temperature gradually decreases in the direction away from the heat transfer conductor. Therefore, the desorption temperature drive of the first adsorbent section is higher than that of the second adsorbent section. Through the above adjustment, the first and second adsorbent sections tend to desorb synchronously in the desorption state, thus ensuring the overall desorption efficiency. In the adsorption state, the temperature gradually increases in the direction away from the heat transfer conductor. Therefore, the adsorption temperature drive of the first adsorbent section is lower than that of the second adsorbent section. Through the above adjustment, the first and second adsorbent sections tend to adsorb synchronously in the adsorption state, thus ensuring the overall adsorption efficiency. In summary, in the adsorption component of the above adsorption bed, considering that the adsorbent part of the adsorption component cannot uniformly transfer heat to the heat transfer conductor, adsorbent sections with different temperature drives are set in the heat transfer direction of the heat transfer conductor to better adapt to the temperature difference generated in the heat transfer direction, so that desorption or adsorption tends to be synchronized, thereby improving the overall desorption efficiency or adsorption efficiency. In summary, the adsorption components of this adsorption bed can effectively solve the problem of the need to improve the working efficiency of adsorption components.

[0009] In some technical solutions, the heat transfer conductor is a pipe structure with a cavity for the flow of heat exchange fluid, and the heat transfer direction of the heat transfer conductor is a transverse direction perpendicular to the flow direction of the heat exchange fluid.

[0010] In some technical solutions, the tube structure is a round tube or a flat tube.

[0011] In some technical solutions, the heat transfer conductor is a heat-conducting fin, and the adsorbent portion is provided on both sides of the heat-conducting fin in the thickness direction, and the heat transfer direction of the heat-conducting fin is the thickness direction.

[0012] In some technical solutions, the particle size of the first adsorbent fraction is smaller than that of the second adsorbent fraction.

[0013] In some technical solutions, the heat transfer conductor 1 includes a tube structure 13 and fins 14, with the opposing sides of adjacent fins 14 combined with the outer wall of the tube structure 13 located between them to form a groove structure; at least one first adsorbent portion 23 extends from one side of one fin 14 onto the outer wall of the tube structure 13 and extends onto the corresponding side of another adjacent fin 14 to form a concave structure, and the second adsorbent portion 22 fills the concave structure.

[0014] In some technical solutions, the particle size of the second adsorbent fraction is between 1.2 and 2.5 times that of the first adsorbent fraction.

[0015] In some technical solutions, the diameter of the adsorbent particles in the first adsorbent portion 23 is 0.45~0.60mm; the diameter of the adsorbent particles in the second adsorbent portion 22 is 0.8-1.0mm.

[0016] In some technical solutions, the first adsorbent portion is bonded to the heat transfer conductor by an adhesive.

[0017] In some technical solutions, the thermal conductivity of the first adsorbent portion is greater than that of the second adsorbent portion.

[0018] In some technical solutions, the first adsorbent portion is an aluminum phosphate or zeolite or an aluminum phosphate-zeolite composite adsorbent layer, and the second adsorbent portion is a silica gel or a silica gel-metal salt composite adsorbent layer.

[0019] In some technical solutions, the thickness of the first adsorbent portion is less than the thickness of the second adsorbent portion.

[0020] In some technical solutions, the temperature difference between the temperature drive of the first adsorbent portion in the desorption state and the temperature drive of the second adsorbent portion in the desorption state is equal to the temperature difference of the first adsorbent portion in the desorption state; the temperature difference between the temperature drive of the first adsorbent portion in the adsorption state and the temperature drive of the second adsorbent portion in the adsorption state is equal to the temperature rise of the first adsorbent portion in the adsorption state.

[0021] To achieve the second objective mentioned above, the present invention also provides an adsorption bed comprising any of the aforementioned adsorption components. Since the aforementioned adsorption components possess the aforementioned technical effects, the adsorption bed having these adsorption components should also possess corresponding technical effects. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a cross-sectional structural diagram of the adsorption component provided in an embodiment of the present invention.

[0024] Figure 2 This is a cross-sectional structural diagram of another adsorption component provided in an embodiment of the present invention.

[0025] The following labels are shown in the attached diagram:

[0026] Heat transfer conductor 1, adsorbent section 2, heat exchange fluid 3, outer wall surface 11, inner wall surface 12, pipe structure 13, fins 14, adsorbent particles 21, second adsorbent section 22, first adsorbent section 23. Detailed Implementation

[0027] This invention discloses an adsorption component for an adsorption bed, which addresses the problem of insufficient working efficiency in adsorption components.

[0028] 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.

[0029] Please see Figure 1 , Figure 1 This is a cross-sectional structural diagram of the adsorption component provided in an embodiment of the present invention.

[0030] In some embodiments, an adsorption component for an adsorption bed is provided, mainly comprising a heat transfer conductor 1 and an adsorbent section 2. The adsorption bed is primarily used in adsorption refrigeration systems.

[0031] The heat transfer conductor 1 refers to a structural component capable of heat transfer. There are two main specific embodiments: the first is a pipe through which the heat exchange fluid 3 flows; the second is a heat-conducting entity, such as heat-conducting fins. The heat transfer direction of the heat transfer conductor 1 is generally determined by its arrangement. Typically, the heat transfer conductor 1 and the adsorbent section 2 are in thermal contact, and the external heat exchange source (heat source or cold source) also needs to be in thermal contact with the heat transfer conductor 1. In this case, the heat transfer conductor 1 acts as an intermediate heat transfer component, conducting heat between the external heat exchange source and the adsorbent section 2. The heat transfer path is clear, and therefore the corresponding heat transfer direction is also clear. Whether the external heat exchange source transfers heat to the adsorbent section 2 or vice versa depends on the temperature difference between the two. During the desorption stage, the external heat exchange source needs to transfer heat to the adsorbent section 2, while during the adsorption stage, the adsorbent section 2 needs to transfer heat to the external heat exchange source.

[0032] The adsorbent section 2 is disposed on one side of the heat transfer conductor 1 in the heat transfer direction, while the other side of the heat transfer conductor 1 is used to transfer heat to an external heat exchange source. It should be noted that "one side" and "the other side" can refer to two sides in a spatial direction, such as a heat exchange tube; however, they can also refer to two sides that are not in a spatial direction, such as fins, in which case one side is the outer surface and the other side is the root structure for heat transfer to the outside. Therefore, "one side" and "the other side" in the heat transfer direction are mainly defined by the heat transfer path, with one end of the heat transfer path in thermal contact with the external heat source, and the other end in thermal contact with the adsorbent section 2. In the first embodiment described above, the adsorbent section 2 is an adsorbent layer wrapped around the outer wall of the tube; in the second embodiment described above, the adsorbent section 2 is an adsorbent layer covering both sides in the thickness direction of the fins.

[0033] The adsorbent section 2 includes a first adsorbent portion 23 and a second adsorbent portion 22 arranged sequentially along the heat transfer direction of the heat transfer conductor 1. The first adsorbent portion 23 is disposed between the second adsorbent portion 22 and the heat transfer conductor 1. This means that the second adsorbent portion 22 needs to transfer heat to the heat transfer conductor 1 through the first adsorbent portion 23, or at least part of the heat transfer between the second adsorbent portion 22 and the heat transfer conductor 1 needs to pass through the first adsorbent portion 23. This is because the adsorbent section 2 cannot achieve an absolutely thin-layer structure in the heat transfer direction. Therefore, there will always be adsorbent portion 2 that cannot contact the heat transfer conductor 1. This part of the adsorbent needs to transfer heat through the adsorbent portion closer to the heat transfer conductor 1. To better illustrate the core difference of this application, at least the first adsorbent portion 23 and the second adsorbent portion 22 are separated in the heat transfer direction. Of course, the adsorbent section 2 may only include the first adsorbent section 23 and the second adsorbent section 22, or it may also include the third adsorbent section, the fourth adsorbent section, etc., and is not limited here.

[0034] There are two main distribution patterns for the first adsorbent portion 23 and the second adsorbent portion 22: The first distribution pattern is that both the first adsorbent portion 23 and the second adsorbent portion 22 are layered, and the heat transfer between the second adsorbent portion 22 and the heat transfer conductor 1 is basically dependent on the first adsorbent portion 23; The second distribution pattern is that the second adsorbent portion 22 surrounds the first adsorbent portion 23, and the edge portion of the second adsorbent portion 22 directly contacts the heat transfer conductor 1, forming a cavity with the heat transfer conductor 1 to accommodate the first adsorbent portion 23.

[0035] In some implementations, the temperature drive of the first adsorbent portion 23 in the desorption state can be higher than that of the second adsorbent portion 22 in the desorption state, and / or the temperature drive of the first adsorbent portion 23 in the adsorption state can be lower than that of the second adsorbent portion 22 in the adsorption state. Both of these methods can coexist, or only one can be satisfied. However, the core idea is that the magnitudes of the temperature drive of the first adsorbent portion 23 and the second adsorbent portion 22 need to be consistent with the temperature change trend in the heat transfer direction.

[0036] It should be noted that the temperature drive of the adsorbent in the desorption state, i.e., the desorption temperature drive of the adsorbent, refers to the temperature at which the adsorbent begins to desorb, or the temperature at which the adsorbent reaches the preset desorption efficiency. Conversely, the temperature drive of the adsorbent in the adsorption state, i.e., the adsorption temperature drive of the adsorbent, refers to the temperature at which the adsorbent begins to adsorb, or the temperature at which the adsorbent reaches the preset adsorption efficiency.

[0037] Therefore, in the desorption state, the temperature gradually decreases in the direction away from the heat transfer conductor 1. As a result, the desorption temperature drive of the first adsorbent portion 23 is higher than that of the second adsorbent portion 22. Through the above adjustment, the first adsorbent portion 23 and the second adsorbent portion 22 can be made to desorb synchronously in the desorption state to ensure the overall desorption efficiency. In the adsorption state, the temperature gradually increases in the direction away from the heat transfer conductor 1. As a result, the adsorption temperature drive of the first adsorbent portion 23 is lower than that of the second adsorbent portion 22. Through the above adjustment, the first adsorbent portion 23 and the second adsorbent portion 22 can be made to adsorb synchronously in the adsorption state to ensure the overall adsorption efficiency. In summary, in the adsorption components of the aforementioned adsorption bed, considering that the adsorbent portion 2 of the adsorption component cannot uniformly transfer heat to the heat transfer conductor 1, different temperature-driven adsorbent portions are arranged in the heat transfer direction of the heat transfer conductor 1 to better adapt to the temperature difference generated in the heat transfer direction, thereby facilitating synchronous desorption or adsorption and improving the overall desorption or adsorption efficiency. In conclusion, the adsorption components of this adsorption bed can effectively solve the problem of insufficient working efficiency of adsorption components.

[0038] In some embodiments, considering that for most adsorbent materials, the temperature difference during the adsorption stage is not significant, at least not as significant as the temperature difference during the desorption stage. For example, the adsorption temperature of aluminum phosphate, zeolite, and silica gel is generally 20-30℃.

[0039] The temperature drive in the desorption state of the first adsorbent section 23 is higher than that in the desorption state of the second adsorbent section 22. The effect can be shown in the following two aspects.

[0040] First, from the perspective of restoring the same adsorption temperature drive level: In the adsorption state, the first adsorbent section 23, which is closer to the heat transfer conductor 1, has a small contact thermal resistance, and its adsorbent temperature begins to drop first; while the second adsorbent section 22, which is farther away from the heat transfer conductor 1, needs to transfer heat through the first adsorbent section 23, and its temperature subsequently begins to drop; since the temperature gradually decreases along the heat transfer direction in the desorption state of the adsorption bed, when the adsorption bed switches from the desorption state to the adsorption state, if it is to restore the same adsorption temperature level, the temperature difference required for the first adsorbent section 23 to drop is greater than the temperature difference required for the second adsorbent section 22 to drop. Therefore, when the temperature drive of the first adsorbent section 23 in the desorption state is higher than that of the second adsorbent section 22, it is not only beneficial to better adapt to the temperature drop generated by the heat transfer direction in the desorption state, but also helps to control the overall adsorbent to quickly restore the same adsorption temperature drive level.

[0041] Second, from the perspective of mass transfer: the adsorption curve of the second adsorbent section 22 conforms to the linear adsorption characteristics, that is, it can start adsorption under low pressure and low humidity conditions and gradually increases with the increase of refrigerant vapor concentration. When the adsorption bed changes from desorption to adsorption, the second adsorbent section 22 can produce adsorption under lower refrigerant concentration. The adsorption curve of the first adsorbent section 23 conforms to the S-type adsorption characteristics, that is, it exerts its adsorption advantage under high pressure and high humidity conditions. As the refrigerant vapor concentration increases, more refrigerant enters the first adsorbent section 23 to produce adsorption, which helps to increase the overall refrigerant adsorption capacity of the adsorbent.

[0042] In some embodiments, although the desorption temperature drive of the first adsorbent portion 23 is higher than that of the second adsorbent portion 22, both need to meet the current desorption temperature. Generally, the temperature difference between the desorption temperature drive of the first adsorbent portion 23 and the second adsorbent portion 22 will not exceed 5 degrees Celsius, typically around 2 degrees Celsius. Specifically, it also depends on the thermal conductivity of both portions. The temperature difference between the desorption temperature drive of the first adsorbent portion 23 and the second adsorbent portion 22 is equal to the temperature difference of the first adsorbent portion 23 in the desorption state. The temperature difference of the first adsorbent portion 23 in the desorption state refers to the temperature difference between the two sides of the first adsorbent portion 23 along the heat transfer direction.

[0043] Correspondingly, although the adsorption temperature drive of the first adsorbent section 23 is lower than that of the second adsorbent section 22, both need to meet the current adsorption temperature. Generally, the temperature difference between the adsorption temperature drives of the first adsorbent section 23 and the second adsorbent section 22 will not exceed 4 degrees Celsius, and is usually around 2 degrees Celsius. Specifically, it also depends on the thermal conductivity of both sections. Specifically, the temperature difference between the adsorption temperature drives of the first adsorbent section 23 and the second adsorbent section 22 can be equal to the temperature difference of the first adsorbent section 23 in the adsorption state. The temperature difference of the first adsorbent section 23 in the adsorption state refers to the temperature difference between the two sides of the first adsorbent section 23 along the heat transfer direction.

[0044] In some embodiments, as shown in the appendix Figure 1 The heat transfer conductor 1 can be a tube structure, with the tube cavity used for the flow of heat exchange fluid 3. In the desorption state, the heat exchange fluid 3 flows, and its temperature is generally relatively high, such as between 55 and 65 degrees Celsius. In the adsorption state, the temperature of the heat exchange fluid 3 is generally relatively low, such as between 28 and 35 degrees Celsius. In this case, the heat transfer direction of the heat transfer conductor 1 is a transverse direction perpendicular to the flow direction of the heat exchange fluid 3. For a circular tube, the heat transfer direction is the radial direction.

[0045] At this time, the first adsorbent portion 23 can be a first adsorbent portion attached to the outer wall of the pipe structure, and the second adsorbent portion 22 can be a second adsorbent portion attached to the outer wall of the pipe structure. Of course, when the pipe structure is placed horizontally, the first adsorbent portion 23 can be a first adsorbent particle layer spread flat on the outer wall of the pipe structure, and the second adsorbent portion 22 can be a second adsorbent particle layer spread flat on the outer wall of the pipe structure.

[0046] In some embodiments, the tube structure can be a circular tube or a flat tube, and the outer surface can be flat, a flat arc surface, or a flat planar surface. The outer surface may also have some minor unevenness while ensuring heat transfer efficiency. A circular tube structure can be used to ensure a larger heat exchange area.

[0047] In some embodiments, the heat transfer conductor 1 is a heat-conducting fin, and adsorbent portions 2 are provided on both sides of the heat-conducting fin in the thickness direction. If the heat transfer direction is the thickness direction of the heat-conducting fin, then heat is transferred from the center to both sides in the thickness direction. In this case, along the thickness direction of the heat-conducting fin, a first adsorbent portion 23, a second adsorbent portion 22, a heat-conducting fin, another first adsorbent portion 23, and another second adsorbent portion 22 can be arranged sequentially to form a multilayer structure. Taking desorption as an example, heat enters the heat-conducting fin from the root, and then is transferred to both sides of the heat-conducting fin in the thickness direction to the first adsorbent portion 23. Due to thermal resistance and the heat absorption and evaporation of the adsorbent working fluid, the first adsorbent portion 23 still transfers excess heat to the second adsorbent portion 22, causing the adsorbent working fluid in the second adsorbent portion 22 to evaporate and absorb heat, thereby achieving heat transfer. Taking adsorption as an example, the heat from the second adsorbent section 22 needs to be transferred to the first adsorbent section 23. At this time, the first adsorbent section 23 needs to have a lower temperature. At the same time, liquid adsorbent working fluid condenses at the first adsorbent section 23, which also needs to release heat. At this time, the heat transferred from the first adsorbent section 23 is collected together to be transferred to the heat-conducting fins.

[0048] In some embodiments, as shown in the appendix Figure 2 As shown, the heat transfer conductor 1 can simultaneously include a tube structure 13 and fins 14, with the fins 14 vertically disposed on the tube structure 13. In this case, the first adsorbent portion 23 can be continuously attached to the outer surface of the tube structure 13 and the fins 14. When multiple fins 14 are provided, a groove structure is formed between adjacent fins 14. The first adsorbent portion 23 can extend from one side of one fin 14 to the outer wall of the tube structure 13, and then extend to the corresponding side of another fin 14 to form a concave structure. At this time, the second adsorbent portion 22 can fill this concave structure.

[0049] In some embodiments, the particle size of the first adsorbent portion 23 is smaller than that of the second adsorbent portion 22. This is because the first adsorbent portion 23 also plays a significant role in heat transfer between the second adsorbent portion 22 and the heat conductor. Making the particle size of the first adsorbent portion 23 smaller than that of the second adsorbent portion 22 improves the compactness of the first adsorbent portion 23, resulting in better heat conduction. The particle size difference between the first adsorbent portion 23 and the second adsorbent portion 22 should also not be too large.

[0050] Specifically, the particle size of the second adsorbent portion 22 can be between 1.2 and 2.5 times that of the first adsorbent portion 23. If the particle size is too small, the heat transfer effect will be insignificant; if the particle size is too large, the heat transfer effect of the particles in the second adsorbent portion 22 itself will be poor.

[0051] In some embodiments, the diameter of the adsorbent particles in the first adsorbent portion 23 may be 0.45 to 0.60 mm, and the diameter of the adsorbent particles in the second adsorbent portion 22 may be 0.8 to 1.0 mm.

[0052] The first adsorbent portion 23 can be bonded to the heat transfer conductor 1 using an adhesive to improve heat transfer performance. The first adsorbent portion 23 and the second adsorbent portion 22 can be sintered together or connected in other ways.

[0053] The particles of the first adsorbent portion 23 and the second adsorbent particles 21 can be blocky or spherical, depending on the specific requirements. The particles of the first adsorbent portion 23 and the second adsorbent particles 21 can have the same or different structures. Generally, the first adsorbent portion 23 also undertakes a significant heat transfer function, so it can adopt a blocky structure for a larger contact area; correspondingly, the second adsorbent particles 21 can adopt a spherical structure, which is more conducive to forming better mass transfer voids.

[0054] In some embodiments, the thermal conductivity of the first adsorbent portion 23 can be greater than that of the second adsorbent portion 22. This effect can be achieved through the material or, seemingly, through the structure, to ensure better heat transfer between the second adsorbent portion 22 and the heat transfer conductor 1. Generally, a higher thermal conductivity of the first adsorbent portion 23 is better, and a lower thermal conductivity of the second adsorbent portion 22 is better.

[0055] In some embodiments, the first adsorbent portion 23 and the second adsorbent portion 22 can be adsorbents of different materials, both can be physical adsorbents, both can be chemical adsorbents, or one can be a physical adsorbent and the other a chemical adsorbent, as long as the above requirements can be met.

[0056] Specifically, the first adsorbent portion 23 can be an aluminum phosphate adsorbent layer, and the second adsorbent portion 22 can be a silica gel adsorbent layer. The aluminum phosphate adsorbent layer can be formed by coating or distributing aluminum phosphate particles, and the silica gel adsorbent layer can be formed by coating or distributing silica gel particles.

[0057] Specifically, the first adsorbent portion 23 and the second adsorbent portion 22 can both be composite adsorbent layers composed of aluminum phosphate particles and silica gel particles. However, the volume ratio of aluminum phosphate particles in the first adsorbent portion 23 is greater than that in the second adsorbent portion 22, so that the temperature drive of the first adsorbent portion 23 in the desorption state is higher than that of the second adsorbent portion 22 in the desorption state.

[0058] In some embodiments, the first adsorbent portion 23 can be an aluminum phosphate or zeolite or an aluminum phosphate-zeolite composite adsorbent layer, and the second adsorbent portion 22 can be a silica gel or a silica gel-metal salt composite adsorbent layer. The aluminum phosphate-zeolite composite adsorbent layer can be obtained by physical mixing, such as placing zeolite and aluminum phosphate powder in a grinder or mixer and mixing thoroughly. The mixed powder can be pressed into blocks, granules, or other shapes as needed. Alternatively, it can be obtained by a sol-gel method, where zeolite powder and an aluminum phosphate precursor (such as aluminum alkoxide) are dissolved in a solvent (such as ethanol), and an appropriate amount of water and an acid catalyst are added to initiate a hydrolysis reaction to prepare a sol. Zeolite powder is then added to the sol, and the mixture is heated and stirred to gradually form a gel. The composite material is obtained after aging, drying, and calcination. The silica gel-metal salt composite adsorbent layer can be obtained by impregnation: the matrix is ​​placed in a prepared salt solution, and after the salt solution has fully entered the matrix pores, it is filtered. Finally, the composite adsorbent is thoroughly dried.

[0059] In some embodiments, the thickness of the first adsorbent portion 23 can be less than the thickness of the second adsorbent portion 22. Taking desorption as an example, since the first adsorbent portion 23 mainly serves a heat transfer function during desorption, the temperature difference cannot be too large, so its thickness should be controlled. The temperature difference of the second adsorbent portion 22 is affected by both the gaseous adsorbent and heat transfer, so its temperature drop trend is weaker than that of the first adsorbent portion 23, therefore its thickness can be appropriately higher. The thickness of the second adsorbent portion 22 can be between 1.2 and 2.5 times that of the first adsorbent portion 23.

[0060] In some embodiments, a controllable composite adsorption heat exchanger based on the optimization of heat and mass transfer impedance is provided, using... Figure 1 The embodiments of the present invention will be described. The composite adsorption heat exchange device includes a heat transfer conductor 1 and an adsorbent section 2. The heat transfer conductor 1 is a heat exchange tube, with one side being the inner wall surface 12 in contact with the heat exchange flow and the other side being the outer wall surface 11 in contact with the adsorbent section 2. The heat exchange tube is generally a metal tube.

[0061] The heat exchange fluid 3 flows inside the heat exchange tube. Adsorbent particles 21, mixed with a binder, are directly coated onto the outer wall surface 11 of the heat exchange tube to form the adsorbent section 2. As the heat exchange fluid 3 flows along the heat exchange tube, its heat is rapidly transferred from the inner wall surface 12 to the outer wall surface 11, exchanging heat with the adsorbent section 2. The adsorbent particles 21 then undergo desorption or adsorption reactions: the desorption reaction is endothermic, and refrigerant vapor is released from the adsorbent particles 21 and leaves the adsorption bed; the adsorption reaction is exothermic, and refrigerant vapor is adsorbed by the adsorbent particles 21 and enters the adsorption bed, as detailed below.

[0062] Desorption process: When a hot fluid with low-grade thermal energy (temperature generally less than 100℃) flows into the heat exchange tube, the heat exchange fluid 3 with higher temperature flows in the heat exchange tube. Due to the strong thermal conductivity of the heat exchange tube, the heat is quickly transferred from the inner wall 12 of the heat exchange tube to the outer wall 11. The thin adsorbent part 2 bonded to its wall is quickly and uniformly heated, the temperature of the adsorbent particles 21 rises, and a desorption reaction occurs. The refrigerant is desorbed from the adsorbent particles 21 to form refrigerant vapor and leaves the adsorption bed, completing the desorption process.

[0063] Adsorption process: After the desorption reaction, the overall temperature of the adsorption bed is relatively high. When the cold fluid (temperature is generally less than 35℃) flows into the heat exchange tube, the lower-temperature heat exchange fluid 3 flows in the heat exchange tube. The inner wall surface 12 and the outer wall surface 11 are at a lower temperature. The heat of the adsorbent part 2 is transferred to the heat exchange tube. Finally, the heat is carried away by the heat exchange fluid 3. That is, the temperature of the heat exchange fluid 3 when it flows out of the heat exchange tube is higher than the temperature when it flows into the heat exchange tube. After the temperature of the adsorbent particles 21 decreases, the adsorption capacity is restored and the adsorption reaction occurs. The refrigerant vapor enters the adsorption bed and completes the adsorption process.

[0064] The adsorbent section 2 is distributed radially along the heat exchange tube in a gradient pattern. The adsorbent particles 21 in the first adsorbent section 23 near the outer wall 11 of the heat exchange tube are aluminum phosphate particles (AlPOs) with a first particle size, while the adsorbent particles 21 in the second adsorbent section 22 away from the outer wall 11 are silica gel particles with a second particle size. The first particle size is smaller than the second particle size. The aluminum phosphate particles (AlPOs) have relatively high driving temperature and thermal conductivity, relatively short adsorption time, and relatively large adsorption capacity; the silica gel particles have relatively good low-temperature adsorption performance. Therefore, the temperature near the outer wall 11 of the heat exchange tube is relatively high, and the small aluminum phosphate (AlPOs) particles reduce the heat transfer resistance, increasing the adsorption capacity and adsorption efficiency; the temperature away from the outer wall 11 is slightly lower, and the large silica gel particles ensure good adsorption performance, while the large particle spacing increases the mass transfer rate within the composite adsorption layer.

[0065] Based on the adsorption components provided in the above embodiments, the present invention also provides an adsorption bed, which includes any one of the adsorption components in the above embodiments. Since this adsorption bed uses the adsorption components in the above embodiments, the beneficial effects of this adsorption bed are explained in the above embodiments.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An adsorption component for an adsorption bed, comprising a heat transfer conductor (1) and an adsorbent portion (2) disposed on one side of the heat transfer conductor (1) in the heat transfer direction, characterized in that, The adsorbent section (2) includes a first adsorbent portion (23) and a second adsorbent portion (22) arranged sequentially along the heat transfer direction of the heat transfer conductor (1). The first adsorbent portion (23) is disposed between the second adsorbent portion (22) and the heat transfer conductor (1). The temperature drive of the first adsorbent portion (23) in the desorption state is higher than that of the second adsorbent portion (22) in the desorption state, and / or the temperature drive of the first adsorbent portion (23) in the adsorption state is lower than that of the second adsorbent portion (22) in the adsorption state.

2. The adsorption component according to claim 1, characterized in that, The heat transfer conductor (1) is a pipe structure with a cavity for the flow of heat exchange fluid (3), and the heat transfer direction of the heat transfer conductor (1) is a transverse direction perpendicular to the flow direction of the heat exchange fluid (3).

3. The adsorption component according to claim 2, characterized in that, The tube structure is either a round tube or a flat tube.

4. The adsorption component according to claim 1, characterized in that, The heat transfer conductor (1) is a heat-conducting fin, and the adsorbent portion (2) is provided on both sides of the thickness direction of the heat-conducting fin. The heat transfer direction of the heat-conducting fin is the thickness direction.

5. The adsorption component according to claim 1, characterized in that, The heat transfer conductor (1) includes a tube structure (13) and fins (14), wherein the opposite sides of adjacent fins (14) are combined with the outer wall of the tube structure (13) located between them to form a groove structure; at least one first adsorbent portion (23) extends from one side of one fin (14) onto the outer wall of the tube structure (13) and extends onto the corresponding side of another adjacent fin (14) to form a concave structure, wherein the second adsorbent portion (22) fills the concave structure.

6. The adsorption component according to claim 1, characterized in that, The particle size of the first adsorbent portion (23) is smaller than that of the second adsorbent portion (22).

7. The adsorption component according to claim 6, characterized in that, The particle size of the second adsorbent fraction (22) is between 1.2 and 2.5 times that of the first adsorbent fraction (23).

8. The adsorption component according to claim 7, characterized in that, The diameter of the adsorbent particles in the first adsorbent portion (23) is 0.45~0.60 mm; the diameter of the adsorbent particles in the second adsorbent portion (22) is 0.8-1.0 mm.

9. The adsorption component according to claim 6, characterized in that, The first adsorbent portion (23) is bonded to the heat transfer conductor (1) by an adhesive.

10. The adsorption member according to any one of claims 1-8, characterized in that, The first adsorbent portion (23) is an aluminum phosphate or zeolite or aluminum phosphate-zeolite composite adsorbent layer, and the second adsorbent portion (22) is a silica gel or silica gel-metal salt composite adsorbent layer.

11. The adsorption member according to claim 10, characterized in that, The thickness of the first adsorbent portion (23) is less than the thickness of the second adsorbent portion (22).

12. The adsorption component according to claim 1, characterized in that, The temperature difference between the first adsorbent portion (23) in the desorption state and the second adsorbent portion (22) in the desorption state is equal to the temperature difference of the first adsorbent portion (23) in the desorption state; the temperature difference between the first adsorbent portion (23) in the adsorption state and the second adsorbent portion (22) in the adsorption state is equal to the temperature rise of the first adsorbent portion (23) in the adsorption state.

13. An adsorption bed, characterized in that, Includes the adsorption component as described in any one of claims 1-11.

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