Microwave heated regenerative drier
By using an external cavity heating medium and a heat-conducting structure in a microwave-heated regenerative adsorption dryer, the problem of uneven heating within the adsorption tower was solved, achieving uniform heating and efficient regeneration of the adsorbent, and improving the production capacity and quality of the finished gas.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN YIPUSI IND CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-07-21
AI Technical Summary
In existing microwave-heated regenerative adsorption dryers, the adsorbent in the adsorption tower is heated unevenly, resulting in poor regeneration effect in the lower part, which affects the production capacity and quality of the finished gas.
The system employs an external cavity and a heating medium combined with a heat-conducting structure. The heating medium in the lower part of the external cavity is heated by microwaves, and the heat is transferred to the lower part of the inner cavity using the heat-conducting structure. This ensures that the adsorbent in the lower part of the inner cavity is heated evenly, thereby improving the water desorption and regeneration effect.
Uniform heating of the adsorbent is achieved, which improves regeneration efficiency and the production capacity and quality of the finished gas, avoids uneven heat distribution within the adsorption tower, and ensures efficient adsorption operation.
Smart Images
Figure CN224524381U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of desiccant dryers, specifically a microwave heating regenerative desiccant dryer. Background Technology
[0002] The circulating regeneration desiccant dryer uses two towers to alternately perform adsorption and regeneration operations. There are several ways to perform the regeneration operation. One method is to divert part of the finished gas output from the adsorption tower during adsorption to the adsorption tower during regeneration. This regeneration method requires sacrificing some finished gas for regeneration, which directly leads to a decrease in the amount of finished gas output by the desiccant dryer. Therefore, there is another regeneration method, which uses the addition of a microwave generator to directly regenerate the adsorbent in the adsorption tower during regeneration. This can significantly reduce the consumption of finished gas and increase the output volume of finished gas.
[0003] In adsorption towers, air typically enters from the bottom and exits from the top. This results in the adsorbent at the bottom absorbing more water than at the top. Existing microwave-heated regenerative desiccant dryers usually place the microwave generator's waveguide at the top of the adsorption tower. This limits the microwave's penetration depth into the adsorbent bed, potentially causing uneven regeneration with the upper part of the adsorbent overheating and the lower part remaining damp. Furthermore, the moisture from the regenerated and desorbed upper adsorbent flows downwards through the lower adsorbent, further increasing the humidity difference between the upper and lower parts of the adsorbent. All of these factors lead to poor regeneration of the lower adsorbent in the adsorption tower, resulting in poor subsequent adsorption performance and affecting the production capacity and quality of the finished gas.
[0004] The research objective of this utility model is to design a microwave heating regenerative desiccant dryer to address the problems existing in the prior art. Utility Model Content
[0005] To address the problems existing in the prior art, this utility model provides a microwave heating regenerative desiccant dryer, which can effectively solve the problems existing in the prior art.
[0006] The technical solution of this utility model is:
[0007] A microwave-heated regenerative desiccant dryer includes:
[0008] Two adsorption towers, each of which includes a metal casing, an outer cavity and an inner cavity separated from the outer cavity and used to fill the adsorbent, a heat-conducting structure for conducting heat downward in the inner cavity, and a heating medium corresponding to the lower part of the inner cavity in the lower part of the outer cavity.
[0009] A microwave generator has its microwave output terminals connected to the top of the outer cavity and the top of the inner cavity, respectively. The heating medium is used to heat the lower part of the inner cavity after being heated by microwaves.
[0010] The air intake pipe has two air outlets that are respectively connected to the bottom of the two inner cavities and are respectively controlled by the air intake control valve to open and close.
[0011] The discharge pipeline has two inlet ends that are respectively connected to the bottom of the two inner cavities and are respectively controlled by the discharge control valve to open and close.
[0012] The air outlet pipe has two air inlets that are respectively connected to the top of the two inner cavities.
[0013] Furthermore, the heating medium is configured as a microwave absorbing material that can absorb microwaves and convert them into heat energy, and the microwave absorbing material is filled in the lower part of the outer cavity or attached to the lower outer wall of the inner cavity.
[0014] Furthermore, the heat-conducting structure includes a plurality of first heat-conducting meshes extending downward from the upper part to the lower part of the inner cavity and arranged laterally at intervals, wherein the first heat-conducting meshes are formed by a plurality of first heat-conducting elements arranged alternately.
[0015] Furthermore, the heat-conducting structure also includes a second heat-conducting mesh arranged around the lower part of the inner cavity. The sidewalls of the second heat-conducting mesh are inclined and the height gradually decreases from the outside to the inside. The lower end of the second heat-conducting mesh is connected to the discharge port at the bottom of the inner cavity. The second heat-conducting mesh is formed by a plurality of second heat-conducting elements arranged alternately. The lower ends of the plurality of first heat-conducting meshes are respectively spaced at intervals corresponding to the inner side of the second heat-conducting mesh. The inlet end of the discharge pipe and the outlet end of the air inlet pipe are respectively connected to the discharge port.
[0016] Furthermore, the outer side of the first heat-conducting mesh is provided with a first mounting frame for connecting a plurality of the first heat-conducting components and the inner wall of the outer cavity, and the outer sides of the upper and lower ends of the second heat-conducting mesh are provided with a second mounting frame for connecting a plurality of the second heat-conducting components with the inner wall of the outer cavity and the discharge port, and the plurality of the first heat-conducting components and the plurality of the second heat-conducting components are all inclined.
[0017] Furthermore, the housing includes an adsorption cylinder and a detachable lower cover located at the lower end of the adsorption cylinder. Both the adsorption cylinder and the lower cover include an inner shell and an outer shell distributed inside and outside. The distance between the inner shell and the outer shell is set to form the outer cavity, and the inner side of the inner shell forms the inner cavity.
[0018] Therefore, the beneficial effects of this utility model are:
[0019] 1. By adding an outer cavity and a heating medium, the heating medium can be heated by microwaves to heat the lower part of the inner cavity. Simultaneously, by adding a heat-conducting structure within the inner cavity for downward heat conduction, heat from the upper part of the inner cavity can be rapidly transferred downwards. This creates a comprehensive, enveloping heating effect on the adsorbent in the lower part of the inner cavity during microwave heating, achieved through the combined action of the heating medium and the heat-conducting structure. This targeted approach allows for more effective desorption and regeneration of the adsorbent with higher moisture absorption in the lower part of the inner cavity, avoiding the uneven heating phenomenon caused by the microwave output being at the top, which results in excessively high heat at the top and low heat at the bottom. It also improves the desorption and regeneration effect on the adsorbent with higher moisture absorption in the lower part of the inner cavity during regeneration, thereby enhancing the adsorbent's ability to continue adsorption after regeneration and ensuring the production capacity and quality of the finished gas.
[0020] 2. To improve the heat conversion rate, the heating medium is designed as a microwave-absorbing material that can absorb microwaves and convert them into heat energy. This microwave-absorbing material is filled in the lower part of the outer cavity or applied to the lower outer wall of the inner cavity. This ensures that the heating medium absorbs microwaves and fully converts them into heat energy, which is then conducted to the adsorbent in the lower part of the inner cavity through the metal casing, thus improving the heating effect of the heating medium on the lower part of the inner cavity.
[0021] 3. By setting up the mesh-like first heat-conducting mesh, during the microwave heating of the inner cavity, the heat in the upper part of the inner cavity can be transferred downward through several first heat-conducting elements. It can also guide the water vapor desorbed from the adsorbent downward, thereby improving the overall regeneration efficiency and effect of the adsorbent. Furthermore, the mesh-like first heat-conducting mesh will not excessively affect the filling amount and uniformity of the adsorbent, thus avoiding affecting the adsorption efficiency of the adsorption tower during adsorption.
[0022] 4. By setting up the second heat-conducting mesh, during the microwave heating of the inner cavity, the heat conducted downward by the second heat-conducting elements can be further conducted downward through the second heat-conducting elements. It can also guide the water vapor guided downward by the second heat-conducting elements to the discharge port for discharge, thereby improving the discharge efficiency of water vapor in the lower part of the inner cavity and preventing water vapor from accumulating in the lower part of the inner cavity and affecting the water desorption and regeneration efficiency of the adsorbent. In addition, the mesh-like second heat-conducting mesh will not excessively affect the filling amount and uniformity of the adsorbent, thereby avoiding affecting the adsorption efficiency of the adsorption tower during adsorption.
[0023] 5. The first and second mounting frames improve the structural stability of the first and second heat-conducting meshes after installation. Furthermore, by tilting several first and second heat-conducting components, the effect and efficiency of the first and second heat-conducting components in conducting heat downward and guiding water vapor downward can be further improved, thereby further improving the regeneration efficiency of the adsorbent. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of a microwave-heated regenerative desiccant dryer.
[0025] Figure 2 This is a schematic cross-sectional view of the adsorption tower.
[0026] Figure 3 This is a schematic diagram of the heat-conducting structure.
[0027] Figure 4 This is a schematic diagram of the first heat-conducting mesh.
[0028] Figure 5 This is a schematic diagram of the second heat conduction mesh. Detailed Implementation
[0029] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:
[0030] refer to Figure 1-5 A microwave-heated regenerative desiccant dryer, comprising:
[0031] Two adsorption towers, each of which includes a casing 1 made of metal, wherein the casing 1 has an outer cavity 11 and an inner cavity 12 disposed inside the outer cavity 11 and used for filling the adsorbent, wherein the inner cavity 12 is provided with a heat-conducting structure 2 for conducting heat downward, and the lower part of the outer cavity 11 is provided with a heating medium 111 corresponding to the lower part of the inner cavity 12.
[0032] The microwave generator has a microwave output terminal 3 connected to the top of the outer cavity 11 and the top of the inner cavity 12 respectively. The heating medium 111 is used to heat the lower part of the inner cavity 12 after being heated by microwaves. Specifically, the microwave generator is located on the top of the housing 1, and its microwave output terminal 3 can be connected to the inner cavity 12 and the outer cavity 11 respectively through a Y-shaped waveguide.
[0033] The air inlet pipe 4 has two air outlets that are respectively connected to the bottom of the two inner cavities 12 and are respectively controlled to open and close by the air inlet control valve 41.
[0034] The discharge pipeline 5 has two inlet ends that are respectively connected to the bottom of the two inner cavities 12 and are respectively controlled by the discharge control valve 51 to open and close; specifically, the discharge pipeline 5 is a regeneration discharge pipeline and the discharge control valve 51 is a regeneration discharge valve.
[0035] The air outlet pipe 6 has two air inlets that are respectively connected to the top of the two inner cavities 12.
[0036] The above structure, through the addition of the outer cavity 11 and the heating medium 111, enables the heating medium 111 to heat the lower part of the inner cavity 12 after being heated by microwaves. At the same time, by adding a heat-conducting structure 2 for downward heat conduction inside the inner cavity 12, the heat-conducting structure 2 can quickly transfer heat from the upper part of the inner cavity 12 to the lower part. Thus, during microwave heating, the heating medium 111 and the heat-conducting structure 2 jointly promote heat conduction to the outer periphery and inner part of the lower part of the inner cavity 12, providing a comprehensive, internal and external enveloping heating of the adsorbent in the lower part of the inner cavity 12. This results in a more effective desorption and regeneration of moisture-absorbing adsorbents with higher moisture absorption in the lower part of the inner cavity 12, avoiding the uneven heating phenomenon caused by the microwave output end 3 being at the top, which results in excessively high heat in the upper part of the inner cavity 12 and excessively low heat in the lower part. It also improves the desorption and regeneration effect of moisture-absorbing adsorbents with higher moisture absorption in the lower part of the inner cavity 12 during regeneration, thereby improving the adsorption effect of the adsorbent after regeneration and ensuring the production capacity and quality of the finished gas.
[0037] To improve the heat conversion rate, the heating medium 111 is configured as a microwave absorbing material that can absorb microwaves and convert them into heat energy. This microwave absorbing material fills the lower part of the outer cavity 11 or is attached to the lower outer wall of the inner cavity 12. This ensures that after absorbing microwaves, the heating medium 111 can fully convert them into heat energy, which is then conducted to the adsorbent in the lower part of the inner cavity 12 through the metal casing 1, thus improving the heating effect of the heating medium 111 on the lower part of the inner cavity 12.
[0038] Specifically, the microwave absorbing material is made of silicon carbide foam, ferrite, or carbon fiber silicone. When the microwave absorbing material is silicon carbide foam, it has strong microwave absorption capacity and can efficiently convert microwave energy into heat energy. It is also a high-temperature resistant porous structure that can be filled in the lower part of the outer cavity 11. When the microwave absorbing material is ferrite, it can be made into granular or honeycomb structure and filled in the lower part of the outer cavity 11 to balance air permeability and heating efficiency, and doped with ceramic particles to provide structural support and thermal conductivity. When the microwave absorbing material is ferrite, its carbon fiber network forms a microwave absorption path and can be directly applied to the lower outer wall of the inner cavity 12, thereby directly conducting heat energy to the adsorbent through the metal casing 1, which is easy to install.
[0039] To avoid excessive influence of the heat-conducting structure 2 on the adsorbent filling, the heat-conducting structure 2 includes a plurality of first heat-conducting meshes 21 extending downward from the upper part to the lower part of the inner cavity 12 and arranged laterally at intervals. The first heat-conducting meshes 21 are formed by a plurality of first heat-conducting elements 211 arranged in an alternating pattern. Through the mesh-like arrangement of the first heat-conducting meshes 21, during the microwave heating of the inner cavity 12, heat from the upper part of the inner cavity 12 can be transferred downward through the plurality of first heat-conducting elements 211. It can also guide the water vapor desorbed from the adsorbent downward, thereby improving the overall regeneration efficiency and effect of the adsorbent. Furthermore, the mesh-like arrangement of the first heat-conducting meshes 21 will not excessively affect the filling amount and uniformity of the adsorbent, thus avoiding affecting the adsorption efficiency of the adsorption tower during adsorption operations.
[0040] To further improve the regeneration effect of the lower part of the inner cavity 12 while avoiding excessive influence of the heat-conducting structure 2 on the filling of the adsorbent, the heat-conducting structure 2 also includes a second heat-conducting mesh 22 arranged around the lower part of the inner cavity 12. The sidewalls of the second heat-conducting mesh 22 are inclined and the height gradually decreases from the outside to the inside. The lower end of the second heat-conducting mesh 22 is connected to the discharge port 121 at the bottom of the inner cavity 12. The second heat-conducting mesh 22 is formed by a plurality of second heat-conducting elements 221 arranged alternately. The lower ends of the plurality of first heat-conducting meshes 21 are respectively spaced at intervals corresponding to the inner side of the second heat-conducting mesh 22. The inlet end of the discharge pipe 5 and the outlet end of the air inlet pipe 4 are respectively connected to the discharge port 121. Specifically, the first heat-conducting element 211 and the second heat-conducting element 221 are both made of high thermal conductivity materials that do not affect microwaves, such as aluminum alloy. The above structure, through the setting of the second heat-conducting mesh 22, allows the heat conducted downward by the second heat-conducting elements 221 to continue to be conducted downward during the microwave heating of the inner cavity 12. It can also guide the water vapor guided downward by the second heat-conducting elements 221 to the discharge port 121 for discharge, thereby improving the discharge efficiency of water vapor in the lower part of the inner cavity 12 and preventing water vapor from accumulating in the lower part of the inner cavity 12 and affecting the water desorption and regeneration efficiency of the adsorbent. Furthermore, the mesh-like arrangement of the second heat-conducting mesh 22 will not excessively affect the filling amount and uniformity of the adsorbent, thereby avoiding affecting the adsorption efficiency of the adsorption tower during adsorption.
[0041] To improve the stability of the installation of the first heat-conducting mesh 21 and the second heat-conducting mesh 22, a first mounting frame 23 is provided on the outer side of the first heat-conducting mesh 21 for connecting a plurality of first heat-conducting elements 211 to the inner wall of the outer cavity 11. A second mounting frame 24 is provided on the outer sides of the upper and lower ends of the second heat-conducting mesh 22 for connecting a plurality of second heat-conducting elements 221 to the inner wall of the outer cavity 11 and the discharge port 121. Both the plurality of first heat-conducting elements 211 and the plurality of second heat-conducting elements 221 are inclined. This structure, through the first mounting frame 23 and the second mounting frame 24, improves the structural stability of the first heat-conducting mesh 21 and the second heat-conducting mesh 22 after installation. Furthermore, by inclinedly arranging the plurality of first heat-conducting elements 211 and the plurality of second heat-conducting elements 221, the effect and efficiency of the first heat-conducting elements 211 and the second heat-conducting elements 221 in conducting heat downwards and guiding water vapor downwards can be further improved, thereby further improving the adsorbent regeneration efficiency.
[0042] To facilitate the assembly and disassembly of the heating medium 111, the housing 1 includes an adsorption cylinder 13 and a detachable lower cover 14 located at the lower end of the adsorption cylinder 13. Specifically, the lower cover 14 and the adsorption tower 13 are connected by a flange seal. Both the adsorption cylinder 13 and the lower cover 14 include an inner shell 15 and an outer shell 16 distributed inside and outside. The distance between the inner shell 15 and the outer shell 16 forms the outer cavity 11, and the inner side of the inner shell 15 forms the inner cavity 12. Thus, the heating medium 111 can be easily assembled and disassembled by removing the lower cover 14.
[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A microwave-heated regenerative desiccant dryer, characterized in that, include: Two adsorption towers, each of which includes a metal housing (1), the housing (1) having an outer cavity (11) and an inner cavity (12) separated from the inner side of the outer cavity (11) and used for filling the adsorbent, the inner cavity (12) having a heat-conducting structure (2) for conducting heat downwards, and the lower part of the outer cavity (11) having a heating medium (111) corresponding to the lower part of the inner cavity (12); The microwave generator has a microwave output terminal (3) connected to the top of the outer cavity (11) and the top of the inner cavity (12) respectively. The heating medium (111) is used to heat the lower part of the inner cavity (12) after being heated by microwaves. The intake pipe (4) has two outlets that are connected to the bottom of the two inner cavities (12) respectively and are controlled to open and close by the intake control valve (41); The discharge pipeline (5) has two inlet ends that are respectively connected to the bottom of the two inner cavities (12) and are respectively controlled to open and close by the discharge control valve (51); The air outlet pipe (6) has two air inlets that are respectively connected to the top of the two inner cavities (12).
2. The microwave-heated regenerative desiccant dryer as described in claim 1, characterized in that, The heating medium (111) is a microwave absorbing material that can absorb microwaves and convert them into heat energy. The microwave absorbing material is filled in the lower part of the outer cavity (11) or attached to the lower outer wall of the inner cavity (12).
3. The microwave-heated regenerative desiccant dryer as described in claim 1, characterized in that, The heat-conducting structure (2) includes a plurality of first heat-conducting meshes (21) extending downward from the upper part to the lower part of the inner cavity (12) and arranged laterally at intervals. The first heat-conducting meshes (21) are formed by a plurality of first heat-conducting elements (211) arranged alternately.
4. A microwave-heated regenerative desiccant dryer as described in claim 3, characterized in that, The heat-conducting structure (2) further includes a second heat-conducting mesh (22) arranged around the lower part of the inner cavity (12). The sidewall of the second heat-conducting mesh (22) is inclined and its height gradually decreases from the outside to the inside. The lower end of the second heat-conducting mesh (22) is connected to the discharge port (121) at the bottom of the inner cavity (12). The second heat-conducting mesh (22) is formed by a plurality of second heat-conducting elements (221) arranged alternately. The lower ends of the plurality of first heat-conducting meshes (21) are respectively spaced at intervals corresponding to the inner side of the second heat-conducting mesh (22). The feed end of the discharge pipe (5) and the air outlet end of the air inlet pipe (4) are respectively connected to the discharge port (121).
5. A microwave-heated regenerative desiccant dryer as described in claim 4, characterized in that, The outer side of the first heat-conducting mesh (21) is provided with a first mounting frame (23) for connecting a plurality of first heat-conducting components (211) and the inner wall of the outer cavity (11). The outer sides of the upper and lower ends of the second heat-conducting mesh (22) are provided with a second mounting frame (24) for connecting a plurality of second heat-conducting components (221) with the inner wall of the outer cavity (11) and the discharge port (121). The plurality of first heat-conducting components (211) and the plurality of second heat-conducting components (221) are all inclined.
6. A microwave-heated regenerative desiccant dryer as described in claim 1, characterized in that, The housing (1) includes an adsorption cylinder (13) and a detachable lower cover (14) located at the lower end of the adsorption cylinder (13). Both the adsorption cylinder (13) and the lower cover (14) include an inner shell (15) and an outer shell (16) distributed inside and outside. The distance between the inner shell (15) and the outer shell (16) forms the outer cavity (11), and the inner cavity (12) is formed inside the inner shell (15).