A drying equipment

Abstract

The present application discloses a drying device, comprising a feeding section, a hot air system, and a drying section; the drying section comprises a cylinder and a central air duct disposed within the cylinder, the central air duct extending axially along the cylinder and being coaxial with the central air duct, and a tube wall of the central air duct being provided with a plurality of radial blowing sections; the feeding section comprises a conveyor belt and an end face fixed to a first end portion of the conveyor belt, the cylinder and the central air duct being rotatably disposed at a second end portion of the conveyor belt; a feeding port and a first air inlet are provided on the end face, the feeding port being disposed above the conveyor belt, the first air inlet being connected to the central air duct; the hot air system comprises a first hot air subsystem, the first hot air subsystem comprising a first hot air heater and a first hot air duct, the first end of the first hot air duct being connected to the first hot air heater, and the second end of the first hot air duct being connected to the first air inlet. The present application is conducive to improving the uniformity, stability, and sensory quality of material drying.

Description

Technical Field

[0001] The present application relates to the technical field of tobacco manufacturing, and more specifically, to a drying device. Background Art

[0002] With the advancement of tobacco industry technology and the continued expansion of cigarette brands, higher demands are being placed on the supply of raw materials. Threshing and redrying is a necessary process for tobacco leaves to transform from agricultural products into raw materials for the cigarette industry, drying the material. Improving the key technologies and equipment for threshing and redrying, and ensuring a stable supply of high-quality tobacco raw materials to meet the needs of cigarette industry enterprises, is crucial for the sustainable and healthy development of cigarette brands on a large scale.

[0003] Tobacco leaf redrying is one of the core technologies in the threshing and redrying process. Existing drum drying processes utilize both conduction heat transfer from the drum wall and convection heat transfer from hot air to provide heat, resulting in a combined conduction-convection heat transfer method for drying the material. Furthermore, during this combined heat transfer drying process, the material particles undergo axial motion, transport, and dispersion and mixing within the drying equipment. Therefore, drum drying offers advantages in terms of uniform material dispersion, uniformity of moist hot air, combined heat transfer efficiency, and drying and dehydration efficiency.

[0004] For the tobacco leaf re-roasting process, the temperature and humidity state and the uniformity of the air volume distribution of the drying hot air in the drum will significantly affect the drying uniformity of the tobacco leaf in the drum. During the drum drying process, when the high-temperature hot air blows through the material, heat and mass are simultaneously convectively transferred between the material and the hot air. Before the hot air reaches its saturated humidity, it will continuously take away the moist hot air in the wet material to achieve the drying of the material. During the drying process, the hot air temperature and air volume will greatly affect the vaporization rate of the wet material surface and the diffusion rate of the wet components inside the material. The air distribution method in the existing drum drying equipment is usually to directly introduce hot air through the air distributor at one end of the drum. The hot air directly enters the interior of the drum through the small holes on the air distributor, and flows co-currently or counter-currently with the material. This air distribution method causes the hot air to be distributed too randomly in the drum, and the contact between the hot air and the material is uneven and insufficient. The mass transfer process is seriously affected, and the uniformity, stability and sensory quality of the drying quality are poor. Summary of the Invention

[0005] The present application provides a drying equipment, in which the central air duct provides radial hot air within a 360° range, so that the falling materials are fully dispersed, while reducing the falling speed of the materials, so that the hot air and the materials are fully in contact, which is beneficial to improving the uniformity, stability and sensory quality of the drying quality of the materials, improving the moisture uniformity of the outlet materials and reducing blade breakage.

[0006] The present application provides a drying device, comprising a feeding part, a hot air system and a drying part; the drying part comprises a cylinder and a central air duct arranged in the cylinder, the central air duct extends along the axial direction of the cylinder, and the cylinder and the central air duct are coaxial, and a plurality of radial blowing parts are provided on the pipe wall of the central air duct; the feeding part comprises a conveyor belt and an end face fixed to the first end portion of the conveyor belt, and the cylinder and the central air duct are rotatably arranged at the second end portion of the conveyor belt; a feeding port and a first air inlet are provided on the end face, the feeding port is arranged above the conveyor belt, and the first air inlet is connected to the central air duct; the hot air system comprises a first hot air subsystem, the first hot air subsystem comprises a first hot air heater and a first hot air duct, the first end of the first hot air duct is connected to the first hot air heater, and the second end of the first hot air duct is connected to the first air inlet.

[0007] Preferably, the drying equipment also includes a discharge part and a moisture exhaust system; the discharge part is connected to the drying part, and the discharge part includes an exhaust port; the moisture exhaust system includes a moisture exhaust hood and a moisture exhaust duct, the moisture exhaust hood is connected to the moisture exhaust duct, and the first air inlet of the moisture exhaust hood is connected to the exhaust port of the discharge part; a filter screen is provided for rotation inside the moisture exhaust hood, and the air intake direction of the first air inlet is consistent with the radial direction of the filter screen.

[0008] Preferably, an auxiliary hot air duct is provided on the first hot air duct, and the auxiliary hot air duct is connected to the second air inlet of the dehumidification hood.

[0009] Preferably, the hot air system also includes a second hot air subsystem, the second hot air subsystem includes a second hot air heater and a second hot air duct, the first end of the second hot air duct is connected to the second hot air heater, the second end of the second hot air duct is connected to the second air inlet of the end face, and the second air inlet is connected to the cylinder.

[0010] Preferably, a second air outlet connected to the second air inlet is provided on the end surface, the second air outlet is arranged above the feed port, and the second air outlet is connected to the cylinder.

[0011] Preferably, the end face includes an air inlet cavity surrounded by an outer plate and an inner plate; the first air inlet and the second air inlet are arranged on the outer plate, and the second air inlet is connected to the air inlet cavity; the second air outlet is arranged on the inner plate, and the second air outlet is connected to the air inlet cavity.

[0012] Preferably, a third air outlet is further provided on the inner side plate, the third air outlet is arranged below the feed port, and the third air outlet is connected to the cylinder.

[0013] Preferably, the first air inlet is connected to the central air duct through an air inlet duct, the air inlet duct passes through the air inlet cavity, and the end of the air inlet duct forms the first air outlet.

[0014] Preferably, the drying device further comprises baffles respectively used for the first air outlet, the second air outlet and the third air outlet.

[0015] Preferably, the drying device further comprises air volume regulating devices respectively used for the first air outlet, the second air outlet and the third air outlet.

[0016] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0018] Figure 1 A structural diagram of the drying equipment provided for this application;

[0019] Figure 2 A structural diagram of the drying device provided in this application, wherein at least the cylinder is removed;

[0020] Figure 3 This is the main structural diagram of the hot air system and moisture exhaust system provided in this application;

[0021] Figure 4-7 They are respectively a front view, a left view, a top view and a three-dimensional view of an embodiment of the end face provided by the present application;

[0022] Figure 8 It is a structural diagram of the moisture removal system and discharge hood provided by this application;

[0023] Figure 9 It is a structural diagram of the moisture exhaust cover provided by this application;

[0024] Figure 10 This is a structural diagram of an embodiment of the central air duct provided by the present application;

[0025] Figure 11 yes Figure 10 A structural diagram of a preferred embodiment;

[0026] Figure 12 and Figure 13 is a structural diagram of another embodiment of the central air duct provided by the present application;

[0027] Figure 14 This is a structural diagram of an embodiment of the cylinder provided by this application;

[0028] Figure 15 is a structural diagram of another embodiment of the cylinder provided by the present application;

[0029] Figure 16 This is a structural diagram of another embodiment of the cylinder provided by the present application;

[0030] Figure 17This is a structural diagram of a bent copy board with a heating tube provided by the present application;

[0031] Figure 18 This is a structural diagram of another embodiment of the cylinder provided in this application. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0035] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] This application provides a drying device. Figure 1-2 As shown, the drying equipment includes a feed section 100, a hot air system 300, a drying section 200, a dehumidification system 400, a discharge section 500, and a frame 600. Materials enter the drying section 200 through the feed section 100, and the dried materials are discharged through the discharge section 500 to the next process. The hot air system 300 generates hot air and delivers it to the drying section 200 through the feed section 100. The hot air comes into contact with the materials, blowing out the moisture in the materials and drying them. The moist hot air (i.e., dehumidified exhaust gas) is then discharged from the drying equipment through the dehumidification system 400.

[0037] The frame 600 is used to support the drying section 200. It is equipped with a reducer for driving the drying section 200, a lifting mechanism for the drying section 200 (used to lift the drying equipment when it stops), and an inclination adjustment device for the drying section 200. As an embodiment, the frame is formed by butt welding rectangular steel pipes and steel plates. Figure 1 and 2 As shown, the feed end of the drying section 200 (ie, the end close to the feed section 100 ) is higher than the discharge end of the drying section 200 (ie, the end close to the discharge section 500 ), which facilitates the output of the material.

[0038] The feed section 100 comprises a horizontal conveyor belt and an end surface 110 fixed to the first end of the conveyor belt. The second end of the conveyor belt serves as the drying section 200. End surface 110 is positioned perpendicular to the conveyor belt and is used to connect to the discharge section and hot air system 300 from the previous process. End surface 110 is provided with a feed port and at least one air inlet. The feed port is located above the conveyor belt and is used to transport material (such as tobacco leaves) onto the conveyor belt and then to the drying section 200. The air inlet feeds hot air from the hot air system into the feed section 100 for further transport to the drying section 200. The feed section 100 also includes a feed hood that wraps around the conveyor belt, creating an enclosed space within the feed section to prevent the hot air from leaking to the outside. The detailed structure of the drying section and hot air system is described below.

[0039] The drying section 200 includes a cylindrical body 210 and a central air duct 220 disposed therein. The central air duct 220 extends axially along the cylindrical body 210 and is coaxial with the cylindrical body 210. The central air duct 220 is circumferentially provided with a plurality of radial blowing portions, through which hot air is ejected to dry the material.

[0040] The discharge section 500 includes a conveyor belt and a discharge cover 510 that wraps the conveyor belt. An exhaust port is provided on the top of the discharge cover 510. The material discharged from the discharge port of the drying section 200 falls by gravity onto the conveyor belt of the discharge section 500, and then is discharged by the vibration of the conveyor belt.

[0041] like Figure 8 As shown, the dehumidification system 400 includes a dehumidification hood 410, a dehumidification damper 420, a dehumidification fan 430 and a dehumidification air duct 440 connected in sequence. The dehumidification hood 410 includes a first air inlet, a second air inlet and an exhaust port. The first air inlet of the dehumidification hood 410 is connected to the exhaust port of the discharge hood 510, and the second air inlet is connected to the auxiliary hot air duct 340. Figure 3 The hot air in the drying section comes into contact with the material, blowing out the moist hot air in the material, which is then discharged through the dehumidification system. The auxiliary hot air duct transports a portion of the hot air to mix with the high-humidity dehumidification exhaust gas, raising the temperature of the dehumidification exhaust gas and preventing the formation of condensation water.

[0042] Preferably, if Figure 9 As shown, a filter 450 is rotated within the dehumidification hood. The air intake direction of the first air inlet of the dehumidification hood is aligned with the radial direction of the filter 450. After the exhaust gas enters the dehumidification hood through the first air inlet, it passes through the rotating filter and is discharged from the dehumidification air duct. The rotating filter prevents fine smoke fragments mixed with the moist hot air from being discharged with the exhaust gas. Preferably, compressed air is intermittently introduced into the filter to prevent the fine smoke fragments from clogging the filter.

[0043] Compared with existing drum drying equipment, the hot air blown out radially by the rotating central air duct fully disperses the falling materials, while reducing the falling speed of the materials, so that the hot air can fully contact the materials, which is beneficial to improving the uniformity, stability and sensory quality of the material drying quality, improving the moisture uniformity of the export material and reducing blade breakage.

[0044] On the basis of the above, preferably, Figure 4-7 As shown, the end surface 110 includes an air inlet cavity 1101 formed by an outer plate and an inner plate, with the inner plate being smaller than the outer plate. The air inlet cavity 1101 is connected to a second air inlet 1107. The outer plate is provided with an air inlet portion 1102 and a first feed port, with the first feed port positioned below the air inlet portion 1102. The air inlet portion 1102 is a hollow cavity, with the second air inlet 1107 positioned on the first end surface of the air inlet portion 1102 and the first air inlet 1103 positioned on the second end surface. The first and second end surfaces are perpendicular. An air inlet duct 1108 extends from the first air inlet 1103 through the air inlet portion 1102 and the air inlet cavity 1101, extending from the inner plate toward the drying section 200. The end of the air inlet duct 1108 forms a first air outlet 1105, which serves as the first air inlet at the feed end of the cylinder 210. The inner panel is provided with a second feed port 1109 and a second air outlet 1104 and a third air outlet 1106, respectively, located above and below the second feed port 1109. The second air outlet 1104 and the third air outlet 1106 are connected to the air inlet chamber 1101, and the air inlet duct 1108 extends from the second air outlet 1104 downward to the central air duct. The first feed port and the second feed port are positioned opposite each other, forming a horizontal feed channel, which serves as the feed port of the end face. Hot air enters the cylinder through the second air outlet 1104, forming the second air inlet at the feed end of the cylinder. Hot air enters the cylinder through the third air outlet 1106, forming the third air inlet at the feed end of the cylinder.

[0045] In this preferred embodiment, the hot air system is as follows Figure 3As shown, the hot air system includes a first hot air subsystem and a second hot air subsystem, the first hot air subsystem includes a first hot air heater 350 and a first hot air duct 320, the first end of the first hot air duct 320 is connected to the first hot air heater 350, and the second end of the first hot air duct 320 is connected to the first air inlet 1103. As an embodiment, the air inlet end of the central air duct 220 is rotatably connected to the air inlet duct 1108 by a hard connection method such as a bearing, so that the cylinder body and the central air duct rotate coaxially and synchronously. As another embodiment, the rotation of the central air duct 220 relative to the air inlet duct 1108 is achieved by a soft connection, so that the cylinder body and the central air duct rotate coaxially and synchronously. As yet another embodiment, the air inlet end of the central air duct 220 is fixedly connected to the air inlet duct 1108. The second hot air subsystem includes a second hot air heater 310 and a second hot air duct 330 . The second end of the second hot air duct 330 is connected to the second hot air heater 310 , and the second end of the second hot air duct 330 is connected to the second air inlet 1107 .

[0046] As an embodiment, the hot air generated by the first hot air heater 350 enters the central air duct through the first air inlet 1103 and the first air outlet 1105. This portion of hot air is blown into the cylinder along the radial direction of the cylinder through the radial blowing portion. The hot air generated by the second hot air heater 310 enters the annular space formed by the cylinder and the central air duct through the second air inlet 1107, the second air outlet 1104, the third air outlet 1106, and the space enclosed by the feed hood. This portion of hot air is blown into the cylinder axially from above and below the feed port 1109. In this embodiment, the hot air enters the cylinder from above, below, and at the center of the material, greatly increasing the contact area between the material and the hot air, thereby improving drying efficiency and drying uniformity.

[0047] It can be understood that the first hot air subsystem and the second hot air subsystem can provide hot air at different temperatures, so that the drying of the material is more efficient.

[0048] It can be understood that the drying device further includes baffles for the first air outlet, the second air outlet and the third air outlet respectively, and one or both of the first air outlet, the second air outlet and the third air outlet can be closed as needed.

[0049] Depending on the desired dehydration and dehumidification requirements, you can select a single or combined air inlet method. For example, with a single central duct air inlet method, hot air flows through the first outlet along the radial direction of the duct for convection drying. This allows for thorough mixing of the hot air and the material, improving drying efficiency and making it suitable for materials with normal moisture content. Alternatively, when the moisture content of incoming materials is high, the central duct's high wind resistance may prevent convection drying. In this case, the lower air inlet method can be simultaneously activated to increase the system's hot air volume.

[0050] It is also understandable that the drying device may also be provided with air volume adjustment devices for the first air outlet, the second air outlet, and the third air outlet, such as first and second orifice plates that can move relative to each other. In different states, the overlap between the holes on the first orifice plate and the holes on the second orifice plate varies.

[0051] Since the wind speed of the hot air in the central duct gradually decreases from the feed end to the discharge end, the drying effect of the hot air at the discharge end is poorer than that at the feed end. In order to solve this technical problem, the present application provides the following embodiment of the central duct.

[0052] As an embodiment, the main body of the central air duct 220 is a cylindrical tube, and the opening rate of the central air duct gradually increases from the feed end to the discharge end to compensate for the attenuation of the wind speed.

[0053] As another embodiment, the central air duct 220 includes at least two air duct sections. The diameter of the air duct section near the feed end of the cylinder is larger than the diameter of the air duct section near the discharge end of the cylinder. The aperture size and number of openings on each air duct section are consistent, and the opening ratio is preferably 20-40%. This embodiment avoids the problem of poor drying effect caused by excessive attenuation of the central air duct at the discharge end. The hot air ejected by the central air duct is more evenly distributed, and the hot air temperature and air volume of each section in the entire cylinder remain stable, thereby improving drying efficiency, effectively avoiding the phenomenon of uneven drying of materials in the cylinder, and greatly improving the drying effect.

[0054] As an example, Figure 2 and 3 As shown, the central air cylinder 220 includes a first air cylinder 2201 and a second air cylinder 2202 , and the diameter of the first air cylinder 2201 is greater than the diameter of the second air cylinder 2202 .

[0055] In this example, as an embodiment, the ends of the first air duct 2201 and the second air duct 2202 are connected by flanges and are interconnected. The first air duct and the second air duct are spliced to form the entire central air duct.

[0056] In this example, as a preferred embodiment, the second air duct 2202 is partially mounted within the first air duct 2201. Specifically, a portion of the first end of the second air duct 2202 (i.e., the end near the feed portion) is inserted into the first air duct 2201. The first end of the first air duct 2201 and the first end of the second air duct 2202 are detachably connected. The second end of the second air duct 2202 is closer to the discharge hood than the second end of the first air duct 2201. The portion of the second air duct 2202 that is inserted into the first air duct does not have a blowing portion. A plurality of radial support rods are provided on the inner wall of the first air duct 2201 and the outer wall of the second air duct 2202 for supporting the two sections of the air duct. The central air duct formed by the first air duct 2201 and the second air duct 2202 rotates as a whole.

[0057] In an embodiment of a two-air duct set, as an example, a first air inlet duct and a second air inlet duct are provided between the first air inlet 1103 and the first air outlet 1105, the diameter of the second air inlet duct is smaller than the diameter of the first air inlet duct, and the second air inlet duct is inserted into the first air inlet duct. The air outlet of the first air inlet duct is connected to the first air duct 2201, so that the two are connected. The air outlet of the second air inlet duct forms a fourth air inlet of the cylinder, and the fourth air inlet is concentric with the first air inlet of the cylinder and is connected to the second air duct 2202, so that the two are connected. In this preferred embodiment, the second end of the second hot air duct is connected to the first air inlet duct. The hot air generated by the second hot air heater enters the space between the first air duct and the second air duct through the first air inlet duct, and this part of the hot air is blown into the part of the cylinder close to the feed part along the radial direction of the cylinder. The hot air system also includes a third hot air subsystem, which includes a third hot air heater and a third hot air duct. The first end of the third hot air duct is connected to the third hot air heater, and the second end of the third hot air duct is connected to the second air inlet duct. The hot air generated by the third hot air heater enters the second air duct through the second air inlet duct. This hot air is blown radially into the portion of the cylinder near the discharge port.

[0058] Preferably, the temperatures of the hot air in the third hot air subsystem and the second hot air subsystem are different, and the feed end and the discharge end of the cylinder use hot air of different temperatures to dry the material, so that the drying of the material is more efficient.

[0059] In an embodiment of a two-air duct set, as another example, the hot air generated by the first hot air heater 350 enters the second air duct 2202 through the first air inlet 1103 and the first air outlet 1105. This portion of hot air is blown radially into the portion of the cylinder near the discharge hood through the second air duct 2202. The hot air generated by the second hot air heater 310 enters the annular space between the first air duct 2201 and the second air duct 2202 through the second air inlet 1107, the second air outlet 1104, the third air outlet 1106, and the space enclosed by the feed hood. This portion of hot air is blown radially into the portion of the cylinder near the feed hood.

[0060] The first and second air ducts can spray hot air simultaneously or separately. According to the drying principle, when wet materials first enter the cylinder, the moisture content is relatively high. At this time, hot air with a higher temperature is used to dry the materials and quickly evaporate the surface water. Therefore, the first air duct uses hot air with a higher temperature to spray. After the surface water evaporates, the material temperature begins to rise. To obtain better material quality at a low temperature, low-temperature hot air is used to dry the materials. Therefore, the second air duct uses hot air with a lower temperature to spray.

[0061] As an embodiment, the auxiliary hot air duct may be a branch pipe of the first air inlet duct, the second air inlet duct or the third air inlet duct.

[0062] As for the blowing portion on the central air duct, as an embodiment, the blowing portion 2203 is a cylindrical blowing pipe.

[0063] However, the tubular blowing portion makes it impossible to provide hot air at the position where the blowing portion is not provided in the cylinder, and the hot air is unevenly distributed in the cylinder. Therefore, preferably, as an embodiment, Figure 12 and 13 As shown, the blowing part 2203 is a blowing pipe with a rectangular cross section, a blowing slit is formed between two parallel plates, and the blowing part 2203 is provided with a plurality of adjustment mechanisms for adjusting the slit width ( Figure 12 (not shown) to adjust the air output of the blowing part. As an embodiment, the adjustment mechanism is a screw-nut assembly. In this embodiment, the central air duct does not rotate, so it is convenient to use the adjustment mechanism 2206 to adjust the width of the slit. On this basis, due to the existence of gravity, the material falls into the lower part of the cylinder during the copying process. Therefore, preferably, an axial partition is provided in the central air duct, and the partition divides the cavity of the central air duct into an upper cavity and a lower cavity. Figure 13 As shown, the partition divides the central air duct into an upper cavity and a lower wall of the same size. Preferably, the volume of the lower cavity is larger than that of the upper cavity, so that the lower part of the central air duct outputs stronger hot air, so that energy is effectively utilized.

[0064] Preferably, as another embodiment, Figure 10 As shown, the blowing part 2204 on the central air duct is a strip hole extending along the axial direction of the central air duct. The strip hole is trapezoidal in shape, with the small opening end close to the feed end of the cylinder and the large opening end close to the discharge end of the cylinder, so as to adjust the opening of the hot air and compensate for the wind speed attenuation. Figure 11 As shown, a plurality of baffles 2205 are evenly arranged along the axial direction on the outer circumference of the central air duct. These baffles 2205 can also be arranged progressively. The baffles are used to adjust the size of the air output.

[0065] The cylinder 210 may be configured in the following manner: The cylinders of the following embodiments may be combined with any of the aforementioned central air ducts to achieve the purpose of drying materials.

[0066] As an embodiment, a plurality of lifting plates are evenly distributed along the circumference of the cylinder. The lifting plates extend along the axial direction of the cylinder and are used to assist the material in lifting during the rotation of the cylinder. The material is thrown under the action of the lifting plates and then comes into contact with the hot air to achieve drying. In this embodiment, the preferred solution for the central air duct is to set a row of blowing parts at the central air duct position corresponding to the space between each two lifting plates, such as Figure 12 As shown, each row of blowing parts provides hot air to the materials in the corresponding scraper interval in a targeted manner, which can make the materials in the cylinder dry more evenly.

[0067] Figure 14 An embodiment of a lifting plate is shown, which uses a straight lifting plate 2101. For applications with larger particles such as tobacco flakes, considering the movement and transmission properties of the material in the cylinder, in order to reduce the throwing angle and the exhaust angle of the material during the lifting movement, and to reduce the drop of the throwing movement, the lifting plate is preferably a bent lifting plate 2102, see Figure 15 and 17 The end of the bent lift plate has a certain bending angle relative to its body, which effectively reduces the drop of the material in the cylinder.

[0068] Preferably, a plurality of heating tubes are evenly arranged on the inner wall of the cylinder 210, such as Figure 16 As shown, heating tube 2104 extends axially along the cylinder. In this preferred embodiment, the drying apparatus also includes a steam heating system that delivers steam to the heating tubes on the cylinder. The heating tubes release heat, heating the air within the cylinder and drying the material. Condensate formed by the steam condenses and is discharged through a drainage pipe. The heating tubes on the inner wall of the cylinder insulate the hot air within the cylinder, thereby increasing the drying speed of the material.

[0069] On this basis, preferably, a plurality of heating tubes are also arranged on the straight copy board and the bent copy board. Figure 17 Taking the bent copy board 2102 as an example, the heating tube 2103 extends along the length direction of the bent copy board 2102.

[0070] In this preferred embodiment, the principle of the drying equipment is as follows: the inner wall of the cylinder and the material shoveling plate are raised to a specified temperature under the action of steam, and the material is fed into the drying equipment via a conveyor belt. During the rotation of the cylinder, the material shoveling plate continuously stirs the material, and the material continuously contacts the inner wall of the cylinder for conduction drying. At the same time, the hot air blown out from the central air duct fully contacts the material in the cylinder for convection drying. The dried moist hot air is discharged from the cylinder under the action of the dehumidification fan at the discharge end. A dehumidification damper is provided in the dehumidification pipe, and corresponding regulation is performed based on the data fed back by the outlet moisture meter. The control program adjusts the moisture content of the tobacco leaves at the outlet by changing the dehumidification volume and the hot air temperature, thereby achieving control of the outlet moisture content.

[0071] As another example, Figure 18 As shown, the inner wall of the cylinder 210 is designed to be a wavy structure, and the material is thrown up and down during the drying process, which makes it easier to quickly dehydrate and dry it thoroughly.

[0072] The beneficial effects of this application are as follows:

[0073] 1. In this application, the central air duct provides radial hot air within a 360° range to fully disperse the falling materials and reduce the falling speed of the materials, so that the hot air can fully contact the materials, which is beneficial to improve the uniformity, stability and sensory quality of the drying quality of the materials, improve the moisture uniformity of the outlet materials and reduce the blade crushing.

[0074] 2. In this application, hot air enters the cylinder from above, below and the center of the material, which greatly increases the contact area between the material and the hot air, thereby improving the drying efficiency and drying uniformity.

[0075] 3. In this application, the auxiliary hot air duct conveys a portion of hot air to mix with the high-humidity exhaust gas to increase the temperature of the exhaust gas and prevent the generation of condensation water.

[0076] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A drying device, characterized in that: It includes feeding section, hot air system and drying section; The drying section includes a cylinder and a central air duct arranged in the cylinder, the central air duct extends along the axial direction of the cylinder, and the cylinder and the central air duct are coaxial, and a plurality of radial blowing portions are provided on the tube wall of the central air duct; The feeding part includes a conveyor belt and an end surface fixed to a first end of the conveyor belt, the cylinder and the central wind tube are rotatably arranged at the second end of the conveyor belt; a feeding port and a first air inlet are provided on the end surface, the feeding port is arranged above the conveyor belt, and the first air inlet is connected to the central wind tube; The hot air system includes a first hot air subsystem, the first hot air subsystem includes a first hot air heater and a first hot air duct, a first end of the first hot air duct is connected to the first hot air heater, and a second end of the first hot air duct is connected to the first air inlet; Among them, the blowing part is a blowing pipe extending axially along the central wind tube and having a rectangular cross-section. The blowing pipe is composed of two parallel plates, and a blowing slit is formed between the two parallel plates. The blowing part is provided with multiple adjustment mechanisms for adjusting the slit width to adjust the air output of the blowing part.

2. The drying equipment according to claim 1, characterized in that The drying equipment also includes a discharging portion and a moisture removal system; The discharge part is connected to the drying part, and the discharge part includes an exhaust port; The dehumidification system includes a dehumidification hood, a dehumidification damper, a dehumidification fan and a dehumidification air duct connected in sequence, and the first air inlet of the dehumidification hood is connected to the exhaust port of the discharging part; A filter screen is rotatably provided in the dehumidifying cover, and the air intake direction of the first air inlet is consistent with the radial direction of the filter screen.

3. The drying equipment according to claim 2, characterized in that: An auxiliary hot air duct is provided on the first hot air duct, and the auxiliary hot air duct is connected to the second air inlet of the dehumidification hood.

4. The drying equipment according to claim 1, characterized in that The hot air system also includes a second hot air subsystem, which includes a second hot air heater and a second hot air duct. The first end of the second hot air duct is connected to the second hot air heater, the second end of the second hot air duct is connected to the second air inlet of the end surface, and the second air inlet is connected to the cylinder.

5. The drying equipment according to claim 4, characterized in that: A second air outlet communicating with the second air inlet is provided on the end surface, the second air outlet is arranged above the feed port, and the second air outlet is communicated with the cylinder.

6. The drying equipment according to claim 5, characterized in that: The end surface includes an air inlet cavity surrounded by an outer plate and an inner plate; The first air inlet and the second air inlet are arranged on the outer plate, and the second air inlet is communicated with the air inlet cavity; The second air outlet is provided on the inner side plate, and the second air outlet is communicated with the air inlet cavity.

7. The drying equipment according to claim 6, characterized in that The inner plate is further provided with a third air outlet, which is arranged below the feed port and is communicated with the cylinder.

8. The drying equipment according to claim 7, characterized in that: The first air inlet is connected to the central air duct through an air inlet duct, the air inlet duct passes through the air inlet cavity, and the end of the air inlet duct forms a first air outlet.

9. The drying device according to claim 8, characterized in that: The drying device further includes baffles respectively used for the first air outlet, the second air outlet and the third air outlet.

10. The drying device according to claim 8, characterized in that: The drying device further includes air volume adjustment devices respectively used for the first air outlet, the second air outlet and the third air outlet.

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