Cut tobacco drying tower and tower type airflow cut tobacco dryer
By adjusting the feed, air inlet and discharge structures in the drying tower, ensuring the uniform distribution and drying of the tobacco wire in the tower body, the problem of uneven drying in traditional wire dryers is solved, and the moisture content uniformity and drying quality of the tobacco wire are improved.
Patent Information
- Application Number
- CN202510036812.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-03-07
AI Technical Summary
Traditional tower airflow wire dryers are prone to uneven drying during the tobacco drying process, which leads to large fluctuations in the moisture content of the tobacco and affects the quality of the finished tobacco.
By changing the feed, air inlet and discharge structure of the drying tower, the tobacco wire feed port is arranged in the center of the bottom of the tower body, and the multiple air inlets are evenly distributed around the circumference of the inlet, and the axis line of the air inlet is arranged in an inclined manner with high inside and low outside, ensuring the uniformity of the distribution and drying of the tobacco wire in the tower body.
The uniform distribution and drying of tobacco in the drying tower is achieved, the contact between the tobacco and the tower wall is reduced, the cyclone phenomenon is avoided, and the consistency of the drying degree of tobacco is ensured, thereby improving the distribution uniformity of the moisture content of tobacco and drying quality.
Smart Images
Figure CN119563914A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of tobacco processing and production equipment, and in particular to a tobacco drying tower and a tower-type airflow tobacco drying machine. Background Art
[0002] In the tobacco production system, the tower airflow dryer is an important part of the tobacco making system. It uses high-temperature convection gas to quickly dry the moisture in the tobacco, so that the tobacco reaches the required moisture content, removes impurities in the tobacco, increases the filling value of the tobacco, and improves the quality of the tobacco.
[0003] However, the traditional tower airflow drying machine is prone to uneven drying of tobacco during the drying process, which leads to large fluctuations in the moisture content of the tobacco, affecting the quality of the finished tobacco. The main reasons for this phenomenon are:
[0004] The structure of the traditional drying tower is as follows: the tobacco feed port is set on the side wall at the lower end of the drying tower, the tobacco discharge port is set on the upper side wall of the drying tower, and the air inlet is set at the lower end of the drying tower, that is, the tobacco feed and discharge are both fed and discharged from the side wall of the drying tower, and the air is taken in from the lower end of the drying tower. The axis of the tobacco feed port is perpendicular to the axis of the air inlet, which causes the tobacco in the drying tower to stick to the wall during the rising process, which not only affects the rising flow rate of the tobacco, but also affects the uniform heat transfer during the drying process of the tobacco; at the same time, it is easy for the tobacco to hit the top of the tower at high speed and return, forming a reverse vortex, so that the residence time of the tobacco in the drying tower is greatly different, which in turn causes differences in the degree of drying of the tobacco and causes the problem of uneven distribution of the moisture content of the tobacco. Summary of the invention
[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wire drying tower and a tower-type airflow wire drying machine, which improves the uniformity of the flow field inside the wire drying tower by changing the feed, air inlet and discharge structures of the wire drying tower, so as to improve the uniformity of tobacco distribution inside the wire drying tower, thereby effectively improving the uniformity of moisture distribution of tobacco after drying processing.
[0006] The present invention is achieved through the following technical solutions:
[0007] A tobacco drying tower comprises a tower body, a tower cap is arranged at the top of the tower body, a tobacco discharge port is arranged at the center of the top of the tower cap, a tobacco feed port is arranged at the center of the bottom of the tower body, the tobacco discharge port, the tower cap, the tower body and the tobacco feed port are all coaxially arranged and the axis line extends vertically; an air inlet structure is arranged at a position close to the bottom of the tower body, the air inlet structure comprises a plurality of air inlets uniformly distributed along the circumference of the tower body, the plurality of air inlets are located at the periphery above the tobacco feed port, the axis line of each air inlet is arranged in an inclined manner with the inner side higher and the outer side lower, the axis line of each air inlet intersects with the axis line of the tobacco feed port, the tobacco passes through the tobacco feed port upward into the tower body under the action of airflow pressure, and is quickly dried and dehydrated under the action of the uniform hot air flow blown out by the plurality of air inlets.
[0008] As a preferred embodiment of the above-mentioned tobacco drying tower, the tower cap includes an expansion section, a side wall section and a top wall section which are sequentially connected from bottom to top, the bottom end of the expansion section is connected to the top of the tower body, the expansion section is an expansion section which gradually expands from bottom to top, the top wall section is a shrinking section which gradually shrinks from bottom to top, and the tobacco discharge port is located at the center of the shrinking end of the top wall section.
[0009] As a preferred embodiment of the above-mentioned wire drying tower, it also includes multiple air inlet pipes, one end of which is connected to the multiple air inlets of the tower body one by one, and the air inlet pipes are coaxially arranged with the corresponding air inlets, and the other ends of the multiple air inlet pipes are connected to the same annular pipe.
[0010] As a preferred embodiment of the above-mentioned drying tower, a first air inlet is provided on the annular tube, and the first air inlet is located on the portion of the annular tube between two adjacent air inlet tubes.
[0011] As a preferred embodiment of the above-mentioned drying tower, the bottom of the tower body is sealed by an inclined bottom plate, an impurity collecting port is opened at the lower end of the bottom plate of the tower body, and an impurity collecting device is connected to the bottom of the impurity collecting port.
[0012] The present invention also discloses a tower-type airflow wire drying machine, comprising a material equalizer, a wire drying tower, an air-material separator and a combustion furnace, wherein the wire drying tower is the above-mentioned wire drying tower, the tobacco feed inlet of the wire drying tower is connected with the discharge port of the material equalizer, the tobacco discharge port of the wire drying tower is connected with the feed inlet of the air-material separator, the combustion furnace is provided with a second air inlet and an exhaust port, the air outlet of the air-material separator is connected with the second air inlet of the combustion furnace, and the exhaust port of the combustion furnace is connected with each air inlet of the wire drying tower.
[0013] As a preferred embodiment of the tower-type airflow tobacco drying machine, it further comprises a vibration trough, the inlet end of the vibration trough is connected to the outlet of the material distributor, and the outlet end of the vibration trough is connected to the tobacco feed inlet of the tobacco drying tower.
[0014] As a preferred embodiment of the tower-type airflow tobacco drying machine, an expansion device is further included, one end of which is connected to the tobacco feed port of the tobacco drying tower, and the other end of which is connected to the outlet end of the vibration groove.
[0015] As a preferred embodiment of the tower-type airflow wire drying machine, the exhaust port of the combustion furnace is also connected to the expansion device, and the outlet end of the vibration groove is arranged on the air pipe between the exhaust port and the expansion device.
[0016] Compared with the prior art, the present invention has the following advantages:
[0017] The present invention provides a tobacco drying tower and a tower-type airflow drying machine, in which a tobacco feed port is arranged at the center of the bottom of the tower body, and multiple air inlets are evenly distributed around the tobacco feed port, and the axis of the air inlet is arranged in an inclined manner with the inner side higher and the outer side lower, so that the axis of the tobacco feed port and the direction of the combined force of the multiple air inlets are the same, which is conducive to forming a more uniform velocity field inside the drying tower, so that the movement and dispersion of the tobacco after entering the tower body are more uniform, which can more effectively reduce or even avoid the contact or collision between the tobacco and the tower wall. In addition, the tobacco discharge port is arranged at the center of the top of the tower cap, facing the movement direction of the tobacco, so as to ensure that the tobacco in the tower body moves vertically upward more smoothly until it enters the tobacco discharge port, avoiding the occurrence of a vortex formed by hitting the top and returning, fully ensuring the consistency of the tobacco drying time, and thus improving the tobacco drying quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a three-dimensional structural schematic diagram of the connection between the wire drying tower and the gas-material separator of the present invention.
[0019] Figure 2 yes Figure 1 Floor plan.
[0020] Figure 3 It is a structural schematic diagram of the tower type airflow silk drying machine of the present invention.
[0021] Figure 4 It is a simulation trajectory diagram of the movement of tobacco particles in the tobacco drying tower of the present invention simulated by ANSYS simulation software.
[0022] Figure 5 This is a simulation trajectory diagram of the movement of tobacco particles in a traditional tobacco drying tower using ANSYS simulation software.
[0023] Numbers in the figure: 1 tower body, 2 tower cap, 3 tobacco discharge port, 4 tobacco feed port, 5 expansion section, 6 side wall section, 7 top wall section, 8 bottom plate, 9 impurity collection port, 10 impurity collection device, 11 air inlet, 12 air inlet pipe, 13 annular pipe, 14 first air inlet, 15 material equalizer, 16 vibration trough, 17 expansion device, 18 gas-material separator, 19 combustion furnace, 20 second air inlet, 21 exhaust port, 22 first air pipe, 23 second air pipe. DETAILED DESCRIPTION
[0024] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.
[0025] See also Figures 1 to 5 The present embodiment discloses a tobacco drying tower, comprising a tower body 1, a tower cap 2 is provided at the top of the tower body 1, a tobacco discharge port 3 is provided at the center of the top of the tower cap 2, and a tobacco feed port 4 is provided at the center of the bottom of the tower body 1. The tobacco discharge port 3, the tower cap 2, the tower body 1, and the tobacco feed port 4 are all coaxially arranged, and the axis line extends vertically. The tower cap 2 comprises an expansion section 5, a side wall section 6, and a top wall section 7 connected in sequence from bottom to top, the bottom end of the expansion section 5 is connected to the top of the tower body 1, the expansion section 5 is an expansion section that gradually expands from bottom to top, the top wall section 7 is a shrinking section that gradually shrinks from bottom to top, and the tobacco discharge port 3 is located at the center of the shrinking end of the top wall section 7. The bottom of the tower body 1 is sealed by an inclined bottom plate 8. An impurity collecting port 9 is opened at the lower end of the bottom plate 8 of the tower body 1. An impurity collecting device 10 is connected to the bottom of the impurity collecting port 9. Stones and other debris mixed in the tobacco can fall to the bottom plate 8 at the bottom of the tower under the action of gravity, then slide into the impurity collecting port 9 and finally enter the impurity collecting device 10, which is beneficial to improving the quality of the tobacco.
[0026] The tower body 1 is provided with an air inlet structure near the bottom, and the air inlet structure includes a plurality of air inlets 11 uniformly distributed along the circumference of the tower body 1. For example, four air inlets 11 can be provided, and the plurality of air inlets 11 are located on the periphery above the tobacco feed port 4. The axis of each air inlet 11 is arranged in an inclined manner with the inner side higher than the outer side, and the axis of each air inlet 11 intersects with the axis of the tobacco feed port 4. The drying tower also includes a plurality of air inlet pipes 12, one end of each of the air inlet pipes 12 is connected to the plurality of air inlets 11 of the tower body 1 in a one-to-one correspondence, and the air inlet pipes 12 are coaxially arranged with the corresponding air inlets 11, and the other ends of the plurality of air inlet pipes 12 are connected to the same annular pipe 13. By providing the annular pipe 13, it can be ensured that the air flow velocity and pressure in each air inlet pipe are substantially the same, and the balanced hot air flow is conducive to forming a uniform flow field in the drying tower, which is convenient for improving the uniformity of tobacco drying. The annular pipe 13 is provided with a first air inlet 14, and an external induced air source is connected through the first air inlet 14. The first air inlet 14 is located on the annular tube 13 between two adjacent air inlet pipes, so that the first air inlet 14 can be prevented from directly facing the air inlet pipe, thereby affecting the balance of the hot air flow. The tobacco shreds enter the tower body 1 upward through the tobacco shreds feed port 4 under the action of the air flow pressure, and are quickly dried and dehydrated under the action of the uniform hot air flow blown out by the multiple air inlets 11.
[0027] When in use, the hot air flow flowing into the tower body 1 through the air inlet 11 flows from bottom to top. In this process, the hot air flow can meet and mix with the tobacco entering the tower body 1, driving the tobacco to flow from bottom to top, realizing the upward gas phase transport of the tobacco. At the same time, the high-temperature air flow takes away the moisture in the tobacco, realizing the rapid drying of the tobacco. Finally, the dried tobacco leaves from the tobacco discharge port 3 at the top.
[0028] Compared with the traditional tobacco drying tower, the tobacco drying tower in this embodiment sets the tobacco feed port 4 at the bottom center of the tower body 1, and at the same time, multiple air inlets 11 are arranged around the tobacco feed port 4 and evenly distributed along the circumference, and the axis of the air inlet 11 is arranged at an angle, thereby making the axis of the tobacco feed port 4 and the direction of the combined force of the multiple air inlets 11 the same, which is conducive to forming a more uniform velocity field inside the tower body 1, so that the tobacco moves more evenly after entering the tower body 1, which can more effectively reduce or even avoid the contact or collision between the tobacco and the tower wall.
[0029] At the same time, the tobacco discharge port 3 is arranged at the center of the top of the tower cap 2, and is also facing the movement direction of the tobacco, so as to ensure that the tobacco moves vertically upward more smoothly until it enters the tobacco discharge port 3, avoiding the situation of hitting the top and returning to form a vortex, fully ensuring the consistency of the tobacco drying time and improving the tobacco drying quality.
[0030] In addition, in this embodiment, the tower cap 2 is designed to include an expansion section 5, a side wall section 6 and a top wall section 7 connected in sequence from bottom to top, and the top wall section 7 is designed to be a shrinking section that gradually shrinks from bottom to top, and the tobacco discharge port 3 is located at the center of the shrinking end of the top wall section 7. When the tobacco flows toward the tobacco discharge port 3, even if part of the tobacco is not facing the tobacco discharge port 3, it can more smoothly follow the airflow and quickly enter the tobacco discharge port 3, thereby avoiding the tobacco airflow from generating a vortex area at the top, and avoiding the movement and retention of part of the tobacco in this area for too long, resulting in problems such as excessive drying and easy breakage of some tobacco and uneven distribution of tobacco moisture content. The design of the expansion section 5 and the side wall section 6 can leave a larger diffusion space for the tobacco airflow, reduce the probability of the tobacco airflow contacting or colliding with the side wall section 6 of the drying tower, and try to avoid the change of the movement trajectory caused by the collision of the tobacco with the side wall section 6, which is conducive to more consistent movement trajectory of the tobacco, ensuring a more consistent drying residence time of the tobacco in the drying tower, and also ensuring a more consistent degree of drying, and finally improving the uniformity of the moisture content distribution of the tobacco.
[0031] The applicant used ANSYS simulation software to simulate the trajectory of tobacco particles in the tobacco drying tower of the present invention and the traditional tobacco drying tower, respectively, and obtained a simulated trajectory diagram of tobacco particles. Figure 4 It is a simulation trajectory diagram of the movement of tobacco particles in the tobacco drying tower of the present invention simulated by ANSYS simulation software. Figure 5This is a simulation trajectory diagram of the movement of tobacco particles in a traditional tobacco drying tower using ANSYS simulation software.
[0032] After comparison Figure 4 and Figure 5 From the trajectory of tobacco particles in the traditional drying tower, we can see that the particle movement trajectory inside the traditional drying tower shows the phenomenon of sticking to the wall opposite to the feed port, and the collision and swirl phenomenon that affects the particle movement trajectory occurs at the top of the drying tower.
[0033] In the drying tower provided by the embodiment of the present invention, the particles in the drying tower collide less with the side walls and the top wall of the tower body 1, there is no vortex phenomenon that affects the movement of the particles, and the particle movement trajectory is evenly dispersed and has good movement consistency.
[0034] This embodiment also discloses a tower-type airflow wire drying machine, including a material leveler 15, a vibration trough 16, an expansion device 17, a wire drying tower, an air-material separator 18 and a combustion furnace 19. The wire drying tower adopts the above-mentioned wire drying tower, the tobacco feed port 4 of the wire drying tower is connected to the discharge port of the material leveler 15, the tobacco discharge port 3 of the wire drying tower is connected to the feed port of the air-material separator 18, and the combustion furnace 19 is provided with a second air inlet 20 and an exhaust port 21, the air outlet of the air-material separator 18 is connected to the second air inlet 20 of the combustion furnace 19, and the exhaust port 21 of the combustion furnace 19 is connected to each air inlet 11 of the wire drying tower. In the specific setting, the exhaust port 21 of the combustion furnace 19 is connected to the first air inlet 14 of the annular tube 13.
[0035] Among them, the tobacco feed port 4 of the drying tower is connected to the discharge port of the material distributor 15 through a vibration groove 16 and an expansion device 17. The inlet end of the vibration groove 16 is connected to the discharge port of the material distributor 15, the outlet end of the vibration groove 16 is connected to the inlet end of the expansion device 17, and the outlet end of the expansion device 17 is connected to the tobacco feed port 4 of the drying tower.
[0036] The exhaust port 21 of the combustion furnace 19 is also connected to the expansion device 17, and the outlet end of the vibration trough 16 is arranged on the air pipe between the exhaust port 21 and the expansion device 17. The exhaust port 21 of the combustion furnace 19 is connected to two air pipes in parallel, which are the first air pipe 22 and the second air pipe 23. The first air pipe 22 is connected to the inlet end of the expansion device 17, and the second air pipe 23 is connected to the first air inlet 14 of the annular tube 13. It is equivalent to that the airflow discharged from the combustion furnace 19 is divided into two paths, one of which is premixed with the tobacco sent by the vibration trough 16, and absorbs moisture and expands under the action of the hot air flow, and at the same time, moves to the expansion device 17 under the action of the air flow, and enters the drying tower through the tobacco feed port 4; the other gas enters the drying tower through each air inlet 11, so as to dry and transport the tobacco entering the drying tower.
[0037] Specifically, the material leveler 15 is used to loosen the tobacco material, the vibration trough 16 is a high-frequency vibration trough 16, which is used to further loosen the material, the expansion device 17 uses the injected high-pressure water vapor to make the tobacco absorb moisture and expand, the tobacco drying tower uses high-temperature process gas to dehydrate and dry the expanded tobacco, the gas-material separator 18 separates the dried tobacco from the gas, and the centrifugal fan sends the gas separated by the gas-material separator 18 to the combustion furnace 19. On the one hand, the heat of the combustion furnace 19 is used to heat the gas, and on the other hand, the waste heat in the separated gas is recovered and utilized to improve energy utilization.
[0038] When in use, the tobacco is loosened by the material distributor 15, enters the vibration trough 16 for further loosening, and then enters the expansion device 17. In the expansion device 17, part of the process gas mixed with the steam is mixed with the tobacco, and the tobacco fully absorbs moisture and expands in the expansion device 17 and is pushed to the tobacco feed port 4 of the drying tower under the action of the airflow jet. Subsequently, the tobacco is transported upward under the action of the high-temperature airflow sent from the multiple air inlets 11 of the drying tower, and is quickly dehydrated, dried and shaped during the transportation process.
[0039] The mixture of shredded tobacco and gas transported from the drying tower flows into the gas-material separator 18, where the shredded tobacco is separated from the gas. At this time, the separated shredded tobacco flows to the next process of the silk making system, and the separated partial airflow flows to the combustion furnace 19 under the action of the centrifugal fan. This partial airflow can be reheated under the heat of the combustion furnace 19 and continue to participate in the circulation.
[0040] After the separated airflow is reheated by the heat of the combustion furnace 19, it enters the tobacco drying tower through a plurality of air inlets 11 so as to dry and transport the tobacco entering the tobacco drying tower.
[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A fiber drying tower, comprising a tower body (1), a tower cap (2) being arranged on the top of the tower body (1), characterized in that: A tobacco discharge port (3) is provided at the center of the top of the tower cap (2), and a tobacco feed port (4) is provided at the center of the bottom of the tower body (1). The tobacco discharge port (3), the tower cap (2), the tower body (1), and the tobacco feed port (4) are all arranged coaxially, and the axis line extends vertically. An air inlet structure is provided at a portion of the tower body (1) near the bottom, and the air inlet structure comprises a plurality of air inlets (11) uniformly distributed along the circumference of the tower body (1). The plurality of air inlets (11) are located at the periphery above the tobacco feed port (4), and the axis line of each air inlet (11) is arranged in an inclined manner with the inner portion being higher and the outer portion being lower. The axis line of each air inlet (11) intersects with the axis line of the tobacco feed port (4). Under the action of airflow pressure, the tobacco passes through the tobacco feed port (4) and enters the tower body (1) upward, and is quickly dried and dehydrated under the action of the uniform hot airflow blown out by the plurality of air inlets (11).
2. A fiber drying tower according to claim 1, characterized in that: The tower cap (2) comprises an expansion section (5), a side wall section (6) and a top wall section (7) which are connected in sequence from bottom to top; the bottom end of the expansion section (5) is connected to the top end of the tower body (1); the expansion section (5) is an expansion section which gradually expands from bottom to top; the top wall section (7) is a contraction section which gradually contracts from bottom to top; and the tobacco discharge port (3) is located at the center of the contraction end of the top wall section (7).
3. A fiber drying tower according to claim 1, characterized in that: It also comprises a plurality of air inlet pipes (12), one end of the plurality of air inlet pipes (12) being connected to the plurality of air inlets (11) of the tower body (1) in a one-to-one correspondence, and the air inlet pipes (12) and the corresponding air inlets (11) being arranged coaxially, and the other ends of the plurality of air inlet pipes (12) being connected to the same annular pipe (13).
4. A fiber drying tower according to claim 3, characterized in that: The annular tube (13) is provided with a first air inlet (14), and the first air inlet (14) is located on the portion of the annular tube (13) between two adjacent air inlet tubes.
5. The fiber drying tower according to claim 1, characterized in that: The bottom of the tower body (1) is sealed by an inclined bottom plate (8); an impurity collection port (9) is provided at the lower end of the bottom plate (8) of the tower body (1); and an impurity collection device (10) is connected to the bottom of the impurity collection port (9).
6. A tower-type airflow wire drying machine, comprising a material homogenizer (15), a wire drying tower, an air-material separator (18) and a combustion furnace (19), characterized in that: The tobacco drying tower is the tobacco drying tower as claimed in any one of claims 1 to 5, the tobacco feed port (4) of the drying tower is connected to the discharge port of the material homogenizer (15), the tobacco discharge port (3) of the drying tower is connected to the feed port of the gas-material separator (18), a second air inlet (20) and an exhaust port (21) are provided on the combustion furnace (19), the air outlet of the gas-material separator (18) is connected to the second air inlet (20) of the combustion furnace (19), and the exhaust port (21) of the combustion furnace (19) is connected to each air inlet (11) of the drying tower.
7. A tower type airflow dryer for tofu according to claim 6, characterized in that: It also comprises a vibration groove (16), the inlet end of the vibration groove (16) is connected to the discharge port of the material equalizer (15), and the outlet end of the vibration groove (16) is connected to the tobacco feed port (4) of the drying tower.
8. A tower type airflow tofu drying machine as claimed in claim 7, characterized in that: It also includes an expansion device (17), one end of which is connected to the tobacco feed port (4) of the drying tower, and the other end of which is connected to the outlet end of the vibration groove (16).
9. A tower type airflow tofu drying machine as claimed in claim 8, characterized in that: The exhaust port (21) of the combustion furnace (19) is also connected to the expansion device (17), and the outlet end of the vibration groove (16) is arranged on the air pipe between the exhaust port (21) and the expansion device (17).