Cut tobacco drying tower and tower type airflow cut tobacco dryer

Abstract

The utility model discloses a cut tobacco drying tower which comprises a tower body, a tower cap is arranged at the top end of the tower body, a cut tobacco discharging port is formed in the center of the top end of the tower cap, a cut tobacco feeding port is formed in the center of the bottom end of the tower body, the cut tobacco discharging port, the tower cap, the tower body and the cut tobacco feeding port are coaxially arranged, and the axes extend in the vertical direction. An air inlet structure is arranged on the tower body and comprises a plurality of air inlets evenly distributed in the circumferential direction of the tower body, the axis of each air inlet is obliquely arranged, the axis of each air inlet intersects with the axis of the tobacco shred feeding port, and tobacco shreds enter the tower body upwards through the tobacco shred feeding port under the action of airflow pressure. And rapid drying and dehydration are realized under the action of uniform hot air flows blown out from the plurality of air inlets. The utility model further discloses the tower type airflow cut tobacco dryer comprising the cut tobacco drying tower. Compared with the prior art, the tobacco shred drying tower has the advantages that the uniformity of a flow field in the tobacco shred drying tower is improved by changing the feeding, air inlet and discharging structures of the tobacco shred drying tower, so that the distribution uniformity of tobacco shreds in the tobacco shred drying tower is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of tobacco processing equipment, and in particular to a drying tower and a tower-type airflow drying machine. Background Technology

[0002] In tobacco production systems, tower-type airflow drying machines are an important component of the tobacco processing system. They utilize high-temperature convective gas to quickly dry the moisture in tobacco shreds, bringing the tobacco shreds to the required moisture content, removing impurities from the tobacco shreds, increasing the filling value of the tobacco shreds, and improving the quality of the tobacco shreds.

[0003] However, traditional tower-type airflow drying machines are prone to uneven drying of tobacco shreds during the drying process, leading to significant fluctuations in the moisture content and affecting the quality of the finished tobacco product. The main reasons for this phenomenon are:

[0004] The traditional structure of a tobacco drying tower is as follows: the tobacco feed inlet is located on the lower side wall of the tower, while the tobacco discharge outlet is located on the upper side wall. The air inlet is located at the lower end of the tower. This means that both tobacco feeding and discharging occur through the side wall, while air intake is from the lower end. The axis of the tobacco feed inlet is perpendicular to the axis of the air inlet, causing the tobacco to adhere to the tower wall as it rises. This not only affects the upward flow rate of the tobacco but also impacts the uniform heat transfer during the drying process. Furthermore, it can easily cause the tobacco to impact the top of the tower at high speed, resulting in a reverse vortex and significant variations in the residence time of the tobacco within the tower. Consequently, this leads to differences in the degree of drying and uneven moisture content distribution of the tobacco. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a drying tower and a tower-type airflow drying machine. By changing the structure of the feeding, air intake and discharge of the drying tower, the uniformity of the internal flow field of the drying tower is improved, thereby improving the uniformity of tobacco distribution inside the drying tower and effectively enhancing the uniformity of moisture distribution of tobacco after drying.

[0006] This utility model is achieved through the following technical solution:

[0007] A tobacco drying tower includes a tower body with a tower cap at the top. The top of the tower cap has a tobacco shred outlet at its center, and the bottom of the tower body has a tobacco shred inlet at its center. The tobacco shred outlet, tower cap, tower body, and tobacco shred inlet are all coaxially arranged with their centerlines extending vertically. Near the bottom of the tower body, there is an air inlet structure, which includes multiple air inlets evenly distributed along the circumference of the tower body. The multiple air inlets are located on the outer periphery above the tobacco shred inlet. The centerline of each air inlet is inclined with the inner side higher than the outer side. The axis of each air inlet intersects the axis of the tobacco shred inlet. Under the action of airflow pressure, the tobacco shreds enter the tower body upward through the tobacco shred inlet and are rapidly dried and dehydrated under the action of the uniform hot airflow blown out by the multiple 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 connected sequentially 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 that gradually widens from bottom to top, and the top wall section is a contraction section that gradually narrows from bottom to top. The tobacco discharge port is located at the center of the contraction end of the top wall section.

[0009] As a preferred embodiment of the above-mentioned drying tower, it also includes multiple air inlet pipes, one end of which is connected to multiple air inlets of the tower body, and the air inlet pipes and the corresponding air inlets are coaxially arranged, and the other end of the multiple air inlet pipes is connected to the same annular pipe.

[0010] As a preferred embodiment of the above-mentioned drying tower, the annular pipe is provided with a first air inlet, which is located on the annular pipe section between two adjacent air inlets.

[0011] As a preferred embodiment of the above-mentioned drying tower, the bottom of the tower body is sealed by an inclined bottom plate, and an impurity collection port is opened at the lower end of the bottom plate of the tower body, with an impurity collection device connected to the bottom of the impurity collection port.

[0012] This utility model also discloses a tower-type airflow drying machine, including a homogenizer, a drying tower, a gas-material separator, and a combustion furnace. The drying tower is the aforementioned drying tower. The tobacco inlet of the drying tower is connected to the outlet of the homogenizer, and the tobacco outlet of the drying tower is connected to the inlet of the gas-material separator. The combustion furnace is provided with a second air inlet and an exhaust outlet. The exhaust outlet of the gas-material separator is connected to the second air inlet of the combustion furnace, and the exhaust outlet of the combustion furnace is connected to each air inlet of the drying tower.

[0013] As a preferred embodiment of the above-mentioned tower-type airflow drying machine, it also includes a vibrating trough, the inlet end of which is connected to the discharge port of the equalizer, and the outlet end of which is connected to the tobacco feed port of the drying tower.

[0014] As a preferred embodiment of the above-mentioned tower-type airflow drying machine, it also includes an expansion device, one end of which is connected to the tobacco feed inlet of the drying tower, and the other end of which is connected to the outlet end of the vibrating trough.

[0015] As a preferred embodiment of the above-mentioned tower-type airflow drying machine, the exhaust port of the combustion furnace is also connected to the expansion device, and the outlet end of the vibrating groove is located on the air pipe between the exhaust port and the expansion device.

[0016] This invention has the following advantages over the prior art:

[0017] This utility model provides a tobacco drying tower and a tower-type airflow drying machine. The tobacco inlet is located at the center of the bottom of the tower body, while multiple air inlets are evenly distributed around the tobacco inlet circumferentially. The axis of the air inlets is inclined inwards, with the axis of the tobacco inlet being higher than the outer axis. This ensures that the axis of the tobacco inlet is aligned with the resultant force direction of the multiple air inlets, thus promoting a more uniform velocity field within the drying tower. This allows for more even dispersion of the tobacco movement after entering the tower, effectively reducing or even eliminating contact or collision between the tobacco and the tower wall. Furthermore, the tobacco outlet is located at the center of the top of the tower cap, directly facing the direction of tobacco movement. This ensures that the tobacco moves more smoothly and vertically upwards within the tower until it enters the outlet, preventing backflow and swirling flow. This ensures consistent drying time and improves the quality of the dried tobacco. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the connection between the wire drying tower and the gas-material separator of this utility model.

[0019] Figure 2 yes Figure 1 Floor plan.

[0020] Figure 3 This is a structural schematic diagram of the tower-type airflow drying machine of this utility model.

[0021] Figure 4 This is a simulation trajectory diagram of the movement of tobacco particles inside the drying tower of this invention, simulated using ANSYS simulation software.

[0022] Figure 5 This is a simulated trajectory diagram of the movement of tobacco particles in a traditional tobacco drying tower, simulated using ANSYS simulation software.

[0023] The following are labeled in the diagram: 1 Tower body, 2 Tower cap, 3 Tobacco shred discharge port, 4 Tobacco shred 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 Feed equalizer, 16 Vibrating trough, 17 Expansion device, 18 Gas-material separator, 19 Combustion furnace, 20 Second air inlet, 21 Exhaust port, 22 First gas pipe, 23 Second gas pipe. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0025] See Figures 1 to 5 This embodiment discloses a tobacco drying tower, including a tower body 1, a tower cap 2 at the top of the tower body 1, a tobacco shred outlet 3 at the center of the top of the tower cap 2, and a tobacco shred inlet 4 at the center of the bottom of the tower body 1. The tobacco shred outlet 3, tower cap 2, tower body 1, and tobacco shred inlet 4 are all coaxially arranged and their axis extends vertically. The tower cap 2 includes an expansion section 5, a side wall section 6, and a top wall section 7 connected sequentially from bottom to top. The bottom end of the expansion section 5 is connected to the top of the tower body 1, and the expansion section 5 is an expansion section that gradually widens from bottom to top. The top wall section 7 is a contraction section that gradually narrows from bottom to top, and the tobacco shred outlet 3 is located at the center of the contraction end of the top wall section 7. The bottom of the tower body 1 is sealed by an inclined base plate 8. The bottom of the base plate 8 of the tower body 1 has an impurity collection port 9. The bottom of the impurity collection port 9 is connected to an impurity collection device 10. Stones and other impurities mixed in with the tobacco can fall to the bottom plate 8 of the tower under the action of gravity and slide into the impurity collection port 9 and finally enter the impurity collection device 10, which helps to improve the quality of the tobacco.

[0026] The tower body 1 has an air inlet structure near its bottom. This structure includes multiple air inlets 11 evenly distributed around the circumference of the tower body 1, for example, four air inlets 11. These inlets 11 are located on the outer periphery above the tobacco feed inlet 4. The axis of each air inlet 11 is inclined inwards, with the centerline of each inlet 11 being higher on the inside and lower on the outside. The axis of each air inlet 11 intersects the axis of the tobacco feed inlet 4. The drying tower also includes multiple air inlet pipes 12. One end of each air inlet pipe 12 is connected to one of the corresponding air inlets 11 of the tower body 1, and the air inlet pipes 12 and their corresponding air inlets 11 are coaxially aligned. The other end of each air inlet pipe 12 is connected to the same annular pipe 13. The annular pipe 13 ensures that the airflow velocity and pressure within each air inlet pipe are essentially the same. This balanced hot airflow helps to form a uniform flow field within the drying tower, improving the uniformity of tobacco drying. The annular pipe 13 has a first air inlet 14, through which an external injection gas source is connected. The first air inlet 14 is located on the annular pipe 13 between two adjacent air inlets. This avoids the first air inlet 14 directly facing the air inlet, thus preventing it from affecting the balance of the hot airflow. Under the action of airflow pressure, the tobacco enters the tower body 1 upward through the tobacco feed inlet 4, and is rapidly dried and dehydrated under the action of the uniform hot airflow blown out by multiple air inlets 11.

[0027] In use, the hot airflow flowing into the tower body 1 through the air inlet 11 flows from bottom to top. During this process, the hot airflow can meet and mix with the tobacco entering the tower body 1, causing the tobacco to flow from bottom to top, realizing the upward gas phase transport of the tobacco. At the same time, the high-temperature airflow carries away the moisture in the tobacco, realizing the rapid drying of the tobacco. Finally, the dried tobacco leaves from the tobacco outlet 3 at the top.

[0028] Compared with traditional tobacco drying towers, the tobacco drying tower in this embodiment sets the tobacco feed inlet 4 at the bottom center of the tower body 1, and arranges multiple air inlets 11 around the tobacco feed inlet 4 and evenly distributed around it in the circumferential direction. The axis of the air inlets 11 is arranged at an angle, so that the axis of the tobacco feed inlet 4 and the resultant force direction of the multiple air inlets 11 are the same. This is conducive to forming a more uniform velocity field inside the tower body 1, so that the movement of the tobacco after entering the tower body 1 is more evenly dispersed. This can more effectively reduce or even avoid contact or collision between the tobacco and the tower wall.

[0029] Meanwhile, the tobacco discharge port 3 is located at the center of the top of the tower cap 2, which is also directly facing the direction of tobacco movement. This ensures that the tobacco moves more steadily and vertically upward until it enters the tobacco discharge port 3, avoiding the situation of rushing to the top and turning back to form a swirling flow. This fully ensures the consistency of tobacco drying time and improves the quality of tobacco drying.

[0030] Furthermore, 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 sequentially from bottom to top. The top wall section 7 is designed to be a narrowing section that gradually narrows from bottom to top. The tobacco outlet 3 is located at the center of the narrowing end of the top wall section 7. When the tobacco flows toward the tobacco outlet 3, even if some tobacco is not directly facing the tobacco outlet 3, it can still smoothly follow the airflow and quickly enter the tobacco outlet 3. This avoids the tobacco airflow from generating a swirling area at the top, and avoids some tobacco from staying in this area for too long, which could lead to problems such as some tobacco being over-dried and easily broken, and uneven distribution of tobacco moisture content. The design of its expansion section 5 and side wall section 6 allows for a larger diffusion space for the tobacco airflow, reducing the probability of the tobacco airflow contacting or colliding with the side wall section 6 of the drying tower. This minimizes the phenomenon of changes in the movement trajectory caused by the collision between the tobacco and the side wall section 6, thus promoting a more consistent movement trajectory of the tobacco. This ensures a more consistent drying residence time for the tobacco in the drying tower, which in turn ensures a more consistent degree of drying, and ultimately improves 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 drying tower of this invention and in a traditional drying tower, and obtained simulated tobacco particle trajectory diagrams. Figure 4 This is a simulation trajectory diagram of the movement of tobacco particles in the drying tower of this invention, simulated using ANSYS simulation software. Figure 5 This is a simulation trajectory diagram of the movement of tobacco particles in a traditional tobacco drying tower, simulated using ANSYS simulation software.

[0032] After comparison Figure 4 and Figure 5 The trajectory of the tobacco particles in the test results shows that the particle movement trajectory inside the traditional drying tower exhibits a phenomenon of adhering to the side wall near the feed inlet, as well as collision and swirling phenomena at the top of the drying tower that affect the particle movement trajectory.

[0033] The drying tower provided in the embodiment of this utility model has less collision between the moving particles and the side wall and top wall of the tower body 1, and there is no swirling phenomenon that affects the movement of particles. The movement trajectory of the particles is evenly dispersed and has good movement consistency.

[0034] This embodiment also discloses a tower-type airflow drying machine, including a uniform feeder 15, a vibrating trough 16, an expansion device 17, a drying tower, a gas-material separator 18, and a combustion furnace 19. The drying tower adopts the aforementioned drying tower. The tobacco inlet 4 of the drying tower is connected to the outlet of the uniform feeder 15, and the tobacco outlet 3 of the drying tower is connected to the inlet of the gas-material separator 18. The combustion furnace 19 is provided with a second air inlet 20 and an exhaust outlet 21. The exhaust outlet of the gas-material separator 18 is connected to the second air inlet 20 of the combustion furnace 19, and the exhaust outlet 21 of the combustion furnace 19 is connected to each air inlet 11 of the drying tower. Specifically, the exhaust outlet 21 of the combustion furnace 19 is connected to the first air inlet 14 of the annular pipe 13.

[0035] The tobacco feed inlet 4 of the drying tower is connected to the discharge outlet of the equalizer 15 via a vibrating trough 16 and an expansion device 17. The inlet end of the vibrating trough 16 is connected to the discharge outlet of the equalizer 15, the outlet end of the vibrating trough 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 inlet 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 vibrating groove 16 is located on the gas pipe between the exhaust port 21 and the expansion device 17. Two parallel gas pipes are connected to the exhaust port 21 of the combustion furnace 19. These two gas pipes are a first gas pipe 22 and a second gas pipe 23. The first gas pipe 22 is connected to the inlet end of the expansion device 17, and the second gas pipe 23 is connected to the first air inlet 14 of the annular pipe 13. Essentially, the airflow discharged from the combustion furnace 19 is divided into two paths. One path of gas premixes with the tobacco shreds from the vibrating groove 16 and undergoes moisture absorption and expansion under the action of the hot airflow. Simultaneously, under the action of the airflow, it moves to the expansion device 17 and enters the drying tower through the tobacco shred inlet 4. The other path of gas enters the drying tower through various air inlets 11 to dry and transport the tobacco shreds entering the drying tower.

[0037] Specifically, the equalizer 15 is used to loosen the tobacco material, the vibrating trough 16 is a high-frequency vibrating trough 16, which is used to further loosen the material, the expansion device 17 uses injected high-pressure water vapor to make the tobacco absorb moisture and expand, the 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 the energy utilization rate.

[0038] In use, after the tobacco shreds are loosened by the equalizer 15, they enter the vibrating trough 16 for further loosening, and then enter the expansion device 17. In the expansion device 17, some of the process gas mixed with steam is mixed with the tobacco shreds. The tobacco shreds fully absorb moisture and expand in the expansion device 17 and are pushed to the tobacco shred inlet 4 of the drying tower under the action of air jet. Subsequently, the tobacco shreds are transported upward under the action of high temperature air flow from multiple air inlets 11 of the drying tower, and are quickly dehydrated, dried and shaped during the transportation process.

[0039] The mixture of tobacco and gas transported from the drying tower flows into the gas separator 18, where the tobacco and gas are separated. The separated tobacco flows to the next process of the tobacco processing system, while a portion of the separated gas flows to the combustion furnace 19 under the action of a centrifugal fan. This portion of the gas can be reheated by the heat of the combustion furnace 19 and continue to participate in the cycle.

[0040] After the separated airflow is reheated by the heat of the combustion furnace 19, it enters the drying tower through multiple air inlets 11 to dry and transport the tobacco shreds entering the drying tower.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cut tobacco tower comprising a tower body (1) having a tower cap (2) at the top end thereof, characterised in that: The tower cap (2) top center is equipped with tobacco discharge port (3), tower body (1) bottom center is equipped with tobacco feeding port (4), tobacco discharge port (3), tower cap (2), tower body (1), tobacco feeding port (4) are coaxial and the axial line extends along the vertical direction; The part of tower body (1) close to the bottom is provided with air inlet structure, the air inlet structure includes a plurality of air inlets (11) which are uniformly distributed along the circumference of the tower body (1), and the plurality of air inlets (11) are located on the periphery above the tobacco feeding port (4), the axial line of each air inlet (11) is inclinedly arranged with the inner high and the outer low, the axial line of each air inlet (11) intersects with the axial line of the tobacco feeding port (4), and the tobacco enters the tower body (1) upward through the tobacco feeding port (4) under the action of the airflow pressure, and is rapidly dried under the action of the uniform hot airflow blown by the plurality of air inlets (11).

2. A cut tobacco tower as claimed in claim 1, characterised in that: The tower cap (2) includes expansion section (5), side wall section (6) and top wall section (7) connected in turn from bottom to top, the bottom end of the expansion section (5) is connected with the top end of the tower body (1), the expansion section (5) is a flared section gradually flared from bottom to top, the top wall section (7) is a constricted section gradually constricted from bottom to top, and the tobacco discharge port (3) is located at the center of the constricted end of the top wall section (7).

3. A cut tobacco tower as claimed in claim 1, characterised in that: Further comprising a plurality of air inlet pipes (12), one end of the plurality of air inlet pipes (12) is communicated with the plurality of air inlets (11) of the tower body (1) one by one, and the air inlet pipe (12) and the corresponding air inlet (11) are coaxial, the other end of the plurality of air inlet pipes (12) is communicated with the same annular pipe (13).

4. A cut tobacco tower as claimed in claim 3, characterised in that: The annular pipe (13) is provided with a first air inlet (14), and the first air inlet (14) is located on the part of the annular pipe (13) between the adjacent two air inlet pipes.

5. A cut tobacco tower as claimed in claim 1, characterised in that: The bottom of the tower body (1) is sealed by an inclined bottom plate (8), the bottom plate (8) of the tower body (1) is provided with an impurity collecting port (9) at the low end, and the bottom of the impurity collecting port (9) is connected with an impurity collecting device (10).

6. A tower type gas flow cuttmg machine comprising a homogenizer (15), a cuttmg tower, a gas-material separator (18) and a combustion furnace (19), characterized in that: The tobacco drying tower is the tobacco drying tower according to any one of claims 1 to 5, the tobacco feeding port (4) of the tobacco drying tower is communicated with the discharge port of the homogenizer (15), the tobacco discharge port (3) of the tobacco drying tower is communicated with the feeding port of the gas-material separator (18), the combustion furnace (19) is provided with a second air inlet (20) and an exhaust port (21), the gas outlet of the gas-material separator (18) is communicated with the second air inlet (20) of the combustion furnace (19), and the exhaust port (21) of the combustion furnace (19) is communicated with each air inlet (11) of the tobacco drying tower.

7. A tower-type rod drying machine as claimed in claim 6, characterized in that: Further comprising a vibrating trough (16), the inlet end of the vibrating trough (16) is communicated with the discharge port of the homogenizer (15), and the outlet end of the vibrating trough (16) is communicated with the tobacco feeding port (4) of the tobacco drying tower.

8. A tower-type rod drying machine as claimed in claim 7, characterized in that: Further comprising an expansion device (17), one end of the expansion device (17) is communicated with the tobacco feeding port (4) of the tobacco drying tower, and the other end of the expansion device (17) is communicated with the outlet end of the vibrating trough (16).

9. A tower-type rod drying machine as claimed in claim 8, characterized in that: The exhaust port (21) of the combustion furnace (19) is also communicated with the expansion device (17), and the outlet end of the vibrating trough (16) is arranged on the air pipe between the exhaust port (21) and the expansion device (17).

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