Microwave drying apparatus and microwave drying collection system

Abstract

The embodiment of the present application provides a microwave drying device and a microwave drying and collecting system, and relates to the field of drying devices.The microwave drying device of the embodiment of the present application comprises a drying shell, a powder pipeline for powder passing, a microwave assembly for providing microwaves, a powder conveying assembly for driving powder flow, and the top of the drying shell is provided with a water vapor outlet; the powder pipeline vertically penetrates the drying shell, the top end and the bottom end of the powder pipeline are respectively an inlet end and an outlet end, the powder pipeline has a hole structure for water vapor escaping; the microwave assembly is arranged in the interior of the drying shell and is distributed around the powder pipeline, a water vapor cavity is formed between the microwave assembly and the powder pipeline, and the water vapor cavity is communicated with the water vapor outlet; the powder conveying assembly is arranged below the drying shell, or the powder conveying assembly is arranged in the powder pipeline.The microwave drying device and the microwave drying and collecting system of the embodiment of the present application realize continuous production, have high drying efficiency, and avoid dust flying.

Description

Technical Field

[0001] This application relates to the field of drying equipment, and more specifically, to a microwave drying device and a microwave drying collection system. Background Technology

[0002] Microwave drying equipment is a modern, highly efficient device that uses microwave energy to heat and dry materials. Unlike traditional drying equipment that relies on external heating methods such as heat conduction and convection, like commonly used airflow dryers, which consume a lot of energy and waste a significant amount of heat, microwave drying is a "volume heating" process from the inside out. Microwave drying equipment is a revolutionary drying technology. With its outstanding characteristics of high efficiency, energy saving, high quality, and environmental friendliness, it is increasingly replacing traditional drying methods and becoming the preferred drying equipment for upgrading modern industries, especially in the food, pharmaceutical, and chemical sectors.

[0003] Currently, the most widely used microwave drying equipment is box-type microwave drying equipment and tunnel-type microwave drying equipment. Box-type microwave drying equipment places the material statically within the microwave cavity for drying. While this type of equipment has low energy consumption, it can only dry materials in batches and cannot produce continuously, resulting in low efficiency. Tunnel-type microwave drying equipment continuously passes materials through the microwave cavity via a conveyor belt for drying. Although this type of equipment can produce continuously, it is prone to dust generation problems when drying powders, especially ultra-light powders, where dust generation is more severe, affecting the workshop environment and resulting in significant energy loss.

[0004] Therefore, a new type of microwave drying equipment is needed to solve the above problems. Utility Model Content

[0005] The purpose of this application is to provide a microwave drying equipment and a microwave drying collection system to achieve continuous production, high drying efficiency, and avoid dust flying.

[0006] In a first aspect, embodiments of this application provide a microwave drying device, which includes a drying shell, the top of which is provided with a water vapor outlet; A powder pipe for supplying powder materials, the powder pipe vertically penetrating the drying shell, the top and bottom ends of the powder pipe being the inlet and outlet ends respectively, and the powder pipe having a perforated structure for allowing water vapor to escape. A microwave assembly for providing microwaves is disposed inside the drying shell and distributed around the powder pipe, and a water vapor chamber is formed between the microwave assembly and the powder pipe, and the water vapor chamber is connected to the water vapor outlet; A powder conveying assembly for driving the flow of powder, the powder conveying assembly being disposed below the drying shell, the inlet of the powder conveying assembly being connected to the outlet end of the powder pipeline, or the powder conveying assembly being disposed inside the powder pipeline.

[0007] In the above implementation process, the drying shell serves as the main body, and a powder pipeline and microwave components are arranged inside it. The powder pipeline provides a movement path for the powder. The powder enters the powder pipeline from the inlet end and flows downward naturally due to its own gravity, exiting from the outlet end. Under the action of the powder conveying component, it is promptly conveyed to the collector's hopper and collected. As the powder passes through the powder pipeline, the microwave components distributed around the powder pipeline perform microwave drying on the powder. Microwave drying has advantages such as low energy consumption, high efficiency, and prevention of powder flying around. The water vapor generated during drying enters the water vapor chamber through the perforated structure of the powder pipeline and is finally discharged from the water vapor outlet. Therefore, the microwave drying equipment of this application embodiment achieves continuous production, has high drying efficiency, and avoids dust flying.

[0008] In one possible implementation, the powder conduit includes a rigid conduit and a filter cloth wrapped around the rigid conduit. The rigid conduit is provided with a channel for water vapor to escape. The channel extends upward from the inside of the conduit to the outside of the conduit and is inclined. The filter cloth has pores for water vapor to escape.

[0009] In the above process, the rigid pipe is a pipe with a certain strength and a very smooth inner wall, which allows the powder to flow downward easily. The pipe is full of channels, which extend upward from the inside of the pipe to the outside. The powder inside the pipe flows downward due to gravity and will not pass through the channels, while the water vapor generated during drying rises and escapes through the channels. The rigid pipe is wrapped with a filter cloth. The pores of the filter cloth allow water vapor to pass through but do not allow powder to pass through, further preventing powder leakage.

[0010] In one possible implementation, the inner diameter of the powder pipe is 200-300 mm.

[0011] In the above implementation process, the inner diameter of the powder pipe is 200-300mm, which not only provides a large space and allows the powder inside the pipe to flow well, but also makes it easy to control the overall width of the powder pipe within the microwave penetration distance of the microwave component, ensuring that the microwave component can microwave heat all the powder inside the pipe.

[0012] In one possible implementation, the microwave component includes a waveguide for transmitting microwaves, the waveguide being uniformly disposed around the powder conduit.

[0013] In one possible implementation, it further includes a water vapor collection chamber, which is connected to the water vapor outlet via a first connecting pipe, and an exhaust fan is provided on the first connecting pipe.

[0014] In the above implementation process, a water vapor collection chamber is used to collect water vapor for subsequent water vapor treatment, and an exhaust fan is used to improve the water vapor removal efficiency.

[0015] In one possible implementation, it further includes a feed hopper disposed on the drying shell, the feed hopper being connected to the feed port of the powder pipeline.

[0016] In the above process, the feeding hopper facilitates the addition of the powder to be dried.

[0017] In one possible implementation, the powder conveying assembly includes a screw feeder.

[0018] In the above process, the screw feeder can provide downward flow power for the powder in the powder pipeline to ensure smooth flow of the powder and realize continuous production.

[0019] Secondly, embodiments of this application provide a microwave drying and collection system, which includes a collector with a hopper and a microwave drying device provided in the first aspect. The outlet of the powder conveying component of the microwave drying device is connected to the hopper of the collector, or the outlet end of the powder pipeline of the microwave drying device is connected to the hopper of the collector.

[0020] In the above implementation process, the microwave drying and collection system of this application embodiment achieves continuous production (drying and collection), and has high drying efficiency, avoiding dust flying.

[0021] In one possible implementation, the outlet of the powder conveying assembly is connected to the bottom of the collector's hopper via a second connecting pipe.

[0022] In one possible implementation, an induced draft fan is connected to the top of the collector's hopper.

[0023] In the above process, under the negative pressure of the induced draft fan, not only can the powder entering the second connecting pipe from the powder output component enter the collector's hopper, but the induced draft fan can also remove the small amount of residual moisture in the powder after it has been processed by the microwave drying equipment, thereby removing the residual moisture in the powder and enabling continuous production. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a microwave drying and collection system provided in an embodiment of this application.

[0026] Icons: 110-Drying shell; 111-Feed hopper; 121-Powder pipe; 122-Microwave assembly; 130-Screw feeder; 141-First connecting pipe; 142-Exhaust fan; 150-Collector; 151-Second connecting pipe; 152-Exhaust fan; 153-Guide valve; 160-Dry powder collection box. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Please refer to Figure 1 This embodiment provides a microwave drying and collection system, which includes a collector 150 with a hopper and a microwave drying device. The microwave drying device is used to microwave dry the powder to be dried, and the collector 150 is used to collect the dried powder. This embodiment is mainly applied to the drying of inorganic powders.

[0035] The microwave drying equipment includes a drying shell 110, a powder pipe 121 for supplying powder, a microwave component 122 for providing microwaves, and a powder conveying component for driving the powder flow. The top of the drying shell 110 has a water vapor outlet. The powder pipe 121 vertically penetrates the drying shell 110, with its top and bottom ends being the inlet and outlet ends, respectively. The powder pipe 121 has perforated structures for water vapor to escape. The microwave component 122 is disposed within the drying shell 110. The microwave component 122 is located inside the powder pipe 121 and distributed around it. A water vapor chamber is formed between the microwave component 122 and the powder pipe 121, and the water vapor chamber is connected to the water vapor outlet. The powder conveying component is located below the drying shell 110. The inlet of the powder conveying component is connected to the outlet of the powder pipe 121, and the outlet of the powder conveying component is connected to the hopper of the collector 150. Alternatively, the powder conveying component is located inside the powder pipe 121, and the outlet of the powder pipe 121 is connected to the hopper of the collector 150.

[0036] In this embodiment, the microwave drying equipment is used for microwave drying of powder to be dried. The drying shell 110 serves as the main body, and a powder pipe 121 and a microwave component 122 are arranged inside it. The interior of the powder pipe 121 provides a movement path for the powder. The powder enters the powder pipe 121 from the feed end and flows downward naturally due to its own gravity. Figure 1The arrows inside the powder pipe 121 indicate the flow direction of the powder, which is discharged from the outlet and promptly conveyed to the hopper of the collector 150 under the action of the powder conveying assembly. During the process of the powder passing through the powder pipe 121, the microwave components 122 distributed around the powder pipe 121 microwave dry the powder. Microwave drying has advantages such as low energy consumption, high efficiency, and prevention of powder scattering. The water vapor generated during drying enters the water vapor chamber through the perforated structure of the powder pipe 121 and is finally discharged from the water vapor outlet. The pore size of the perforated structure near the inside of the powder pipe 121 is smaller than the particle size of the powder to prevent powder overflow. Therefore, the microwave drying and collection system of this embodiment achieves continuous production, high drying efficiency, and avoids dust scattering.

[0037] In this application, the principle of microwave drying is to utilize microwave energy (a type of electromagnetic wave) to directly act on the polar molecules (especially water molecules) in the material being dried, causing them to vibrate and rub against each other at high speed, thereby generating heat inside the material and rapidly evaporating the moisture to achieve the purpose of drying. Microwave drying has the following characteristics: the heat transfer direction is from the inside to the outside; microwave energy penetrates the material and generates heat throughout; the energy transfer method is that electromagnetic energy is directly converted into the kinetic energy (thermal energy) of the material molecules; the drying speed is extremely fast, with steam generated inside, forming a propulsive force for outward diffusion; the thermal efficiency is high, and energy acts directly on the material and water with minimal loss. Therefore, microwave drying has significant advantages over traditional hot air drying.

[0038] In some embodiments of this application, the powder conduit 121 is arranged vertically, so that the powder can flow naturally downward therein.

[0039] In some embodiments of this application, the powder pipe 121 includes a rigid pipe and a filter cloth wrapped around the rigid pipe. The rigid pipe is provided with a channel for water vapor to escape. The channel extends upward from the inside of the pipe to the outside and is inclined. The filter cloth has pores for water vapor to escape.

[0040] The rigid pipe serves as the framework structure, and its material is one that allows microwaves to heat the powder inside the pipe, such as glass, polytetrafluoroethylene (PTFE), or ceramic; PTFE is a preferred material. The filter cloth is made of PTFE, PP, or similar materials and has pores; optionally, the porosity of the filter cloth is 5%-30%, and the pore size is 0.01-5 micrometers.

[0041] In this embodiment, the rigid pipe is a pipe with a certain strength. The inner wall of the rigid pipe made of the above-mentioned material can be very smooth, so that the powder can easily flow downward. The pipe is full of channels, and the channels extend upward from the inside of the pipe to the outside. The powder inside the pipe flows downward due to gravity and will not pass through the channels, while the water vapor generated during drying rises and escapes through the channels. The rigid pipe is wrapped with a filter cloth. The pores of the filter cloth allow water vapor to pass through but do not allow powder to pass through, further preventing powder leakage.

[0042] In some embodiments of this application, the inner diameter of the powder conduit 121 is 200-300 mm. For example, the inner diameter of the powder conduit 121 is 200 mm, 220 mm, 240 mm, 250 mm, 280 mm, 300 mm, or any two of the above values.

[0043] In this embodiment, the inner diameter of the powder pipe 121 is 200-300mm, which not only provides a larger space, allowing for better flow of the powder inside the pipe, but also facilitates control of the overall width of the powder pipe 121 within the microwave penetration distance of the microwave component 122, ensuring that the microwave component 122 can microwave heat all the powder inside the pipe. In actual use, the microwave drying equipment can adjust the microwave treatment time and microwave treatment power of the powder to ensure that the powder is fully dried; the microwave treatment time can be controlled by adjusting the length of the powder pipe 121 and adjusting the conveying power provided by the powder conveying component.

[0044] In some embodiments of this application, the microwave component 122 includes a waveguide for transmitting microwaves, the waveguide being uniformly disposed around the powder conduit 121. Figure 1 The microwave component 122 shown in the diagram mainly refers to the position of the waveguide. There is a certain distance between the waveguide and the powder pipe 121 to form a water vapor cavity for containing water vapor.

[0045] In this embodiment, the microwave component 122 includes a waveguide and a magnetron. The magnetron is the core component of the microwave component 122, generating high-frequency microwaves (such as 2.45 GHz) through the action of an electromagnetic field. These microwaves are transmitted to the powder pipeline 121 through the waveguide to heat the powder inside the pipeline. The waveguide is mainly responsible for transmitting the microwaves generated by the magnetron to the powder pipeline 121. Its structure is a closed cavity made of metal, forming standing waves through continuous reflection of electromagnetic waves at the conductor boundary, but it does not generate microwaves itself.

[0046] In some embodiments of this application, the waveguide of the microwave component 122 is distributed at least in half of the area of ​​the powder conduit 121 from the inlet to the outlet. In this embodiment, the area of ​​the powder conduit 121 corresponding to the waveguide for transmitting microwaves is relatively large to ensure sufficient processing time of the powder in the powder conduit 121 by the microwaves, thereby enabling the powder to be fully dried.

[0047] In some embodiments of this application, the microwave component 122 can be configured as multiple groups, which can be connected in series. As one embodiment, multiple groups of waveguides are provided, which are sequentially arranged around different positions along the length of the powder pipeline 121, thereby enabling thorough microwave drying of the powder.

[0048] In some embodiments of this application, it further includes a water vapor collection chamber, which is connected to a water vapor outlet via a first connecting pipe 141, and an exhaust fan 142 is provided on the first connecting pipe 141. Figure 1 The arrow on the first connecting pipe 141 indicates the direction of water vapor discharge.

[0049] In this embodiment, a water vapor collection chamber is used to collect water vapor for subsequent water vapor treatment, and an exhaust fan 142 is used to improve the water vapor removal efficiency.

[0050] In some embodiments of this application, it also includes a feed hopper 111 disposed on the drying housing 110, the feed hopper 111 being connected to the feed inlet of the powder pipeline 121.

[0051] In this embodiment, the feeding hopper 111 facilitates the addition of the powder to be dried.

[0052] In some embodiments of this application, the powder conveying assembly includes a screw feeder 130.

[0053] In this embodiment, the screw feeder 130, also commonly referred to as a spiral feeder or spiral feeder, is a general-purpose device that uses rotating spiral blades to push materials forward within a fixed housing, thereby achieving precise and continuous feeding.

[0054] In this embodiment, the powder conveying assembly is a screw feeder 130, which is located below the drying housing 110. The inlet of the screw feeder 130 is connected to the outlet of the powder pipeline 121, enabling the screw feeder 130 to provide downward flow power for the powder in the powder pipeline 121, ensuring smooth powder flow and achieving continuous production. In this embodiment, the conveying path of the powder conveying assembly from the inlet to the outlet is horizontal, that is, the screw feeder 130 is horizontally positioned.

[0055] In other embodiments of this application, a powder conveying assembly is disposed within the powder pipeline 121. This assembly primarily consists of a screw, vertically positioned within the powder pipeline 121. The screw and the powder pipeline 121 together form a screw feeder structure, facilitating the smooth flow of powder within the powder pipeline 121 from the inlet to the outlet. In this embodiment, the conveying path of the powder conveying assembly from the inlet to the outlet is vertically arranged, i.e., the screw feeder 130 is vertically arranged. Correspondingly, in the microwave drying and collection system, the outlet end of the powder pipeline 121 is directly connected to the hopper of the collector 150.

[0056] In some embodiments of this application, the outlet of the powder conveying assembly is connected to the bottom of the hopper of the collector 150 via a second connecting pipe 151. In one embodiment, the outlet of the powder conveying assembly is not directly connected to the second connecting pipe 151. In this embodiment, one end of the second connecting pipe 151 is located below the outlet of the powder conveying assembly, and a receiving hopper is provided at a corresponding position to catch the powder discharged from the outlet of the powder conveying assembly. In another embodiment, the outlet of the powder conveying assembly is directly connected to the second connecting pipe 151. For example, the corresponding ends of the outlets of the powder conveying assembly are joined together, allowing the powder discharged from the powder conveying assembly to directly enter the second connecting pipe.

[0057] In some embodiments of this application, a blower 152 is connected to the top of the hopper of the collector 150.

[0058] In this embodiment, under the negative pressure of the blower 152, not only can the powder entering the second connecting pipe 151 from the outlet of the powder output component enter the hopper of the collector 150, but the blower 152 can also remove the small amount of residual moisture in the powder after it has been processed by the microwave drying equipment, thereby removing the residual moisture in the powder and enabling continuous production.

[0059] In one implementation, the collector 150 can be a baghouse dust collector. Powder enters from the bottom of the hopper; larger particles settle directly, while finer particles enter the filter bag area with moisture. The powder is trapped on the outer surface of the filter bags, while moisture passes through the bags and is discharged by the induced draft fan 152. As the powder layer on the filter bag surface thickens, resistance increases, and the cleaning system starts according to a pre-set program, shaking the adhered powder into the hopper.

[0060] In other embodiments, the collector 150 in the microwave drying collection system can also be a common hopper, which is located below the outlet of the powder conveying assembly to catch and collect the powder discharged from the outlet of the powder conveying assembly; or the collector 150 can be directly located below the outlet of the powder pipe 121 to catch and collect the powder discharged from the outlet of the powder pipe 121.

[0061] In some embodiments of this application, the bottom of the hopper of the collector 150 is provided with a guide valve 153 and connected to a dry powder collection box 160.

[0062] In this embodiment, when the dry powder in the hopper of collector 150 is collected to a certain amount, the blower 152 is turned off and the feed valve 153 is opened, so that the dry powder in the hopper can be discharged into the dry powder collection box 160. This setting will hardly affect the continuous production of the microwave drying equipment.

[0063] In summary, the microwave drying equipment and microwave drying collection system of this application embodiment achieve continuous production, have high drying efficiency, and avoid dust flying.

[0064] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A microwave drying apparatus, characterized in that, It includes a drying shell, the top of which is provided with a water vapor outlet; A powder pipe for supplying powder materials, the powder pipe vertically penetrating the drying shell, the top and bottom ends of the powder pipe being the inlet and outlet ends respectively, and the powder pipe having a perforated structure for allowing water vapor to escape. A microwave assembly for providing microwaves is disposed inside the drying shell and distributed around the powder pipe, and a water vapor chamber is formed between the microwave assembly and the powder pipe, and the water vapor chamber is connected to the water vapor outlet; A powder conveying assembly for driving the flow of powder, the powder conveying assembly being disposed below the drying shell, the inlet of the powder conveying assembly being connected to the outlet end of the powder pipeline, or the powder conveying assembly being disposed inside the powder pipeline.

2. The microwave drying equipment according to claim 1, characterized in that, The powder pipeline includes a rigid pipe and a filter cloth wrapped around the rigid pipe. The rigid pipe is provided with a channel for water vapor to escape. The channel extends upward from the inside of the pipe to the outside and is inclined. The filter cloth has pores for water vapor to escape.

3. The microwave drying equipment according to claim 1 or 2, characterized in that, The inner diameter of the powder pipeline is 200-300mm.

4. The microwave drying equipment according to claim 1, characterized in that, The microwave component includes a waveguide for transmitting microwaves, the waveguide being uniformly arranged around the powder pipeline.

5. The microwave drying equipment according to claim 1, characterized in that, It also includes a water vapor collection chamber, which is connected to the water vapor outlet via a first connecting pipe, and an exhaust fan is installed on the first connecting pipe.

6. The microwave drying equipment according to claim 1, characterized in that, It also includes a feed hopper disposed on the drying shell, the feed hopper being connected to the feed port of the powder pipeline.

7. The microwave drying equipment according to claim 1, characterized in that, The powder conveying assembly includes a screw feeder.

8. A microwave drying and collection system, characterized in that, It includes a collector with a hopper and a microwave drying device as described in any one of claims 1-7, wherein the outlet of the powder conveying assembly of the microwave drying device is connected to the hopper of the collector, or the outlet end of the powder pipe of the microwave drying device is connected to the hopper of the collector.

9. The microwave drying and collection system according to claim 8, characterized in that, The discharge port of the powder conveying assembly is connected to the bottom of the collector's hopper via a second connecting pipe.

10. The microwave drying and collection system according to claim 8, characterized in that, The collector's hopper is connected to a blower at the top.

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