Tobacco shred expansion system

Abstract

The utility model relates to the technical field of carbon dioxide expanded tobacco shreds, in particular to a tobacco shred expansion system which comprises a dipping device, a feeding airlock, a Venturi tube, a sublimation tube, a tangential separator, a discharging airlock, a moisture regain device, a process fan, a combustion furnace and a mixing pipeline. The combustion furnace is connected with the mixing pipeline; the mixing pipeline comprises a transverse pipe and an inverted U-shaped gantry pipe, the combustion furnace and the process fan are respectively connected with one end of the gantry pipe, the other end of the gantry pipe is connected with the transverse pipe, the transverse pipe is connected with the Venturi pipe, the gantry pipe prolongs the mixing pipeline, the mixing time and space of cold and hot process gas are increased, and the mixing efficiency is improved. The cold air and the hot air are fully mixed in the mixing pipeline and then enter the sublimation pipe, so that the tobacco shreds in the sublimation pipe are uniformly heated, and the moisture stability of the expanded tobacco shreds is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco expansion, and more specifically, to a tobacco expansion system. Background Art

[0002] The advanced technology and process of carbon dioxide expanded tobacco has been recognized by most tobacco factories. The principle is as follows: dry ice tobacco is sent into the Venturi tube of the sublimator from the feed air lock, and enters the sublimation tube under the push of high-temperature process gas. Under the action of high-speed and high-temperature process gas, the solid carbon dioxide inside the dry ice tobacco sublimates rapidly and the water evaporates rapidly, causing the tobacco to expand; after the tobacco is heated and expanded, it falls from the discharge air lock into the cooling vibration trough for cooling, and then enters the feeding and rehumidification process.

[0003] The prior art discloses a tobacco shred expansion drying device, including a combustion furnace and an expansion drying duct connected thereto, a venturi output pipe, a hot air pipe, a return air pipe, and a main process fan; the process gas enters the main process fan from the return air chamber through the return air pipe; the process gas is divided into three flow directions after passing through the main process fan: one part is discharged; another part is directly returned to the combustion furnace through the linkage damper provided in the return air pipe connected to the combustion furnace by the main process fan and heated to the required process gas temperature; another part bypasses the combustion furnace through the linkage damper provided in the hot air pipe and mixes with the heated process gas to obtain the required process gas temperature; the latter two parts of the process gas mentioned above are mixed with the shredded tobacco at the venturi output through the hot air pipe again and enter the drying expansion duct. However, the hot air pipe path is short, and the two parts of the process gas cannot be fully mixed, so that the dry ice shredded tobacco entering the sublimation tube is heated unevenly, which affects the uniformity of the moisture content of the expanded shredded tobacco. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a tobacco expansion system, which can lengthen the path of the mixing pipeline, increase the time and space for mixing cold air and hot air, and make the cold air and hot air fully mixed in the mixing pipeline before entering the sublimation tube, so that the tobacco in the sublimation tube is heated evenly, and the moisture stability of the expanded tobacco is improved.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A tobacco expansion system is provided, comprising an impregnation device, a feed air lock, a venturi tube, a sublimation tube, a tangential separator, a discharge air lock, a rehumidification device, a process fan, a combustion furnace, and a mixing pipeline, wherein the impregnation device is connected to the feed air lock, the feed air lock is connected to the venturi tube, the two ends of the venturi riser are respectively connected to the mixing pipeline and the sublimation tube, the sublimation tube, the discharge air lock, and the process fan are respectively connected to the tangential separator, the discharge air lock is connected to the rehumidification device, the combustion furnace and the mixing pipeline are respectively connected to the process fan, and the combustion furnace is connected to the mixing pipeline; the mixing pipeline comprises a cross pipe and an inverted "U"-shaped gantry pipe, the combustion furnace and the process fan are respectively connected to one end of the gantry pipe, the other end of the gantry pipe is connected to the cross pipe, and the cross pipe is connected to the venturi tube.

[0007] In the tobacco expansion system of the utility model, tobacco is processed by an impregnation device to form dry ice tobacco, the dry ice tobacco falls into the venturi tube through the feed air lock, and is mixed with the hot process gas in the mixing pipeline, the process gas sends the dry ice tobacco into the sublimation tube, when the dry ice tobacco contacts the hot process gas, the dry ice sublimates and causes the tobacco to expand rapidly, the expanded tobacco is separated from the process gas by a tangential separator, the tobacco falls through the discharge air lock and enters the rehumidification device for processing, and the tobacco expansion is completed, and after the process gas separated by the tangential separator is adsorbed by the process fan, part of the process gas is sent to the combustion furnace for heating and then enters the mixing pipeline, and part of the process gas directly enters the mixing pipeline and is mixed with the process gas heated by the combustion furnace for cyclic use. In this embodiment, the mixing pipeline includes a cross pipe and a gantry tube. The setting of the gantry tube extends the mixing pipeline, increases the time and space for mixing the cold and hot process gases, and allows the cold air and hot air to be fully mixed in the mixing pipeline before entering the sublimation tube, so that the tobacco in the sublimation tube is heated evenly, thereby improving the moisture stability of the tobacco after expansion.

[0008] Furthermore, the plane where the center line of the gantry tube is located forms an angle with the vertical plane where the center line of the cross tube is located, and the end of the gantry tube connected to the cross tube extends in the direction away from the feed gas lock, further extending the path of the mixing pipeline to make the process gas mixing more complete.

[0009] Furthermore, it also includes an anemometer, which is installed on the transverse tube. The process gas wind speed is an important basis for adjusting the process indicators of expanded tobacco. Installing the anemometer on the transverse tube can improve the accuracy of wind speed measurement and ensure that the means of regulating process indicators are effective.

[0010] Furthermore, both ends of the transverse tube are gradually inclined toward the middle of the transverse tube, and a sewage outlet is provided at the bottom end of the middle of the transverse tube, which can facilitate the collection of sewage to the sewage outlet across the middle for discharge, and at the same time avoid the accumulation of condensed water in the pipeline to affect the normal operation of the anemometer.

[0011] Further, the sublimation tube includes a first connecting tube, a reducing tube and a second connecting tube, one end of the first connecting tube is connected to the venturi tube, the other end of the first connecting tube is connected to one end of the reducing tube, the other end of the reducing tube is connected to the second connecting tube, and the other end of the second connecting tube is connected to the tangential separator. The reducing tube can gradually reduce the air flow velocity therein and increase the residence time of the tobacco in the sublimation tube.

[0012] Furthermore, the inner diameter of the reducer is 500-540 mm, and the inner diameter of the reducer gradually increases from the end connected to the first connecting tube to the end connected to the second connecting tube. The existing reducer has a large taper. As the diameter of the tube suddenly increases, the cross-sectional area through which the process gas flows increases. Under the condition of constant air volume, the wind pressure gradient of the process gas per unit time decreases rapidly, resulting in a serious attenuation of the wind speed of the process gas in the reducer. The tobacco runs at a low speed and stays in the sublimation tube for too long, resulting in the tobacco being retained in the sublimation tube and repeatedly heated. The moisture content of the expanded tobacco is low and charred tobacco blocks may be produced, resulting in a risk of combustion at the hot end. By reducing the taper of the reducer and reducing the amount of wind speed reduction, the tobacco can be prevented from being repeatedly heated in the sublimation tube, the moisture content of the expanded tobacco can be increased, and the crushing can be reduced.

[0013] Furthermore, the mixing pipeline is provided with a steam interface, and the steam interface is externally connected to a steam station for supplying steam to the mixing pipeline through the steam pipeline. For the drying process of expanded tobacco, in order to ensure the humidity of the process gas used to dry the tobacco and avoid the tobacco from burning during the drying process, the steam station is used to add steam to the high-temperature process gas in the mixing pipeline through the steam pipeline, thereby ensuring that the process gas has appropriate humidity.

[0014] Furthermore, the steam station includes a steam-water separator, which is connected to the steam pipeline. The added steam has high requirements, which should not contain excess water, and the stability of steam supply should be ensured. While the steam is supplied through the steam station, the steam and water are separated through the steam-water separator to improve the steam dryness, thereby improving the quality of the process gas and reducing the fluctuation of the moisture content of the tobacco caused by the excess moisture in the steam.

[0015] Furthermore, the operating frequency range of the process fan is 35 to 40 Hz, which reduces equipment operating noise and reduces maintenance costs.

[0016] Furthermore, a cooling vibration groove is provided between the discharge air lock and the moisture conditioning device, and the expanded tobacco is continuously cooled and cooled by the cooling vibration groove to achieve cooling and shaping of the tobacco.

[0017] Compared with the prior art, the tobacco expansion system of the utility model has the following beneficial effects:

[0018] The path of the mixing pipeline can be lengthened to increase the time and space for mixing cold air and hot air, so that the cold air and hot air can enter the sublimation tube after being fully mixed in the mixing pipeline, so that the tobacco in the sublimation tube is heated evenly and the moisture stability of the expanded tobacco is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the tobacco expansion system in the embodiment of the utility model at a first viewing angle;

[0020] Figure 2 for Figure 1 A magnified view of the part A in the middle;

[0021] Figure 3 It is a structural schematic diagram of the tobacco expansion system in the embodiment of the utility model at a second viewing angle;

[0022] In the attached drawings: 1-gantry tube; 2-cross tube; 3-venturi tube; 4-sublimation tube; 41-first connecting tube; 42-reducing tube; 43-second connecting tube; 5-tangential separator; 6-installation port. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0025] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Embodiment 1

[0027] A tobacco expansion system, such as Figure 1 , Figure 3 As shown, it includes an impregnation device, a feed air lock, a venturi tube 3, a sublimation tube 4, a tangential separator 5, a discharge air lock, a rehumidification device, a process fan, a combustion furnace, and a mixing pipeline. The impregnation device is connected to the feed air lock, the feed air lock is connected to the venturi tube 3, the two ends of the venturi riser are respectively connected to the mixing pipeline and the sublimation tube 4, the sublimation tube 4, the discharge air lock, and the process fan are respectively connected to the tangential separator 5, the discharge air lock is connected to the rehumidification device, the combustion furnace and the mixing pipeline are respectively connected to the process fan, and the combustion furnace is connected to the mixing pipeline; the mixing pipeline includes a transverse tube 2 and an inverted "U"-shaped gantry tube 1, the combustion furnace and the process fan are respectively connected to one end of the gantry tube 1, the other end of the gantry tube 1 is connected to the transverse tube 2, and the transverse tube 2 is connected to the venturi tube 3.

[0028] In the above-mentioned tobacco expansion system, the tobacco is processed by an impregnation device to form dry ice tobacco, the dry ice tobacco falls into the venturi tube 3 through the feed air lock, and is mixed with the hot process gas in the mixing pipeline. The process gas sends the dry ice tobacco into the sublimation tube 4. When the dry ice tobacco contacts the hot process gas, the dry ice sublimates and causes the tobacco to expand rapidly. The expanded tobacco is separated from the process gas through the tangential separator 5, and the tobacco falls through the discharge air lock into the rehumidification device for processing to complete the tobacco expansion. After the process gas separated by the tangential separator 5 is adsorbed by the process fan, part of the process gas is sent to the combustion furnace for heating and then enters the mixing pipeline, and part of the process gas directly enters the mixing pipeline and is mixed with the process gas heated by the combustion furnace for cyclic use. Among them, the mixing pipeline includes a cross pipe 2 and a gantry pipe 1. The setting of the gantry pipe 1 extends the mixing pipeline, increases the time and space for mixing the cold and hot process gases, and allows the cold air and hot air to be fully mixed in the mixing pipeline before entering the sublimation tube 4, so that the tobacco in the sublimation tube 4 is heated evenly, thereby improving the moisture stability of the tobacco after expansion.

[0029] like Figure 3 As shown, the plane where the center line of the gantry tube 1 is located forms an angle with the vertical plane where the center line of the cross tube 2 is located, and the end of the gantry tube 1 connected to the cross tube 2 extends away from the feed gas lock, further extending the path of the mixing pipeline, so that the process gas is mixed more fully. Specifically, the two ends of the inverted "U"-shaped gantry tube 1 are arranged downward to reduce the installation space occupied.

[0030] The anemometer is also included, and the anemometer is installed on the horizontal tube 2. The process gas velocity is an important means to adjust the process index of the expanded tobacco. Specifically, the anemometer is an Annubar anemometer, which is installed on the horizontal tube 2 through the installation port 6. Figure 2 As shown, installing the anemometer on the horizontal pipe 2 can improve the accuracy of wind speed measurement and ensure that the means of regulating process indicators are effective.

[0031] Both ends of the transverse pipe 2 are gradually inclined toward the middle of the transverse pipe 2, and a sewage outlet is provided at the bottom end of the middle of the transverse pipe 2. In this embodiment, it is convenient to collect sewage to the sewage outlet across the middle and discharge it, and at the same time, it can prevent condensed water from accumulating in the pipeline and affecting the normal operation of the anemometer.

[0032] The operating frequency range of the process fan is 35-40Hz, which reduces equipment operating noise and reduces maintenance costs.

[0033] A cooling vibration trough is also provided between the discharge air lock and the rehumidification device, through which the expanded tobacco is continuously dissipated and cooled, so as to achieve cooling and shaping of the tobacco.

[0034] Embodiment 2

[0035] This embodiment is similar to the first embodiment, except that Figure 1 , Figure 3 As shown, the sublimation tube 4 includes a first connecting tube 41, a reducing tube 42 and a second connecting tube 43. One end of the first connecting tube 41 is connected to the venturi tube 3, the other end of the first connecting tube 41 is connected to one end of the reducing tube 42, the other end of the reducing tube 42 is connected to the second connecting tube 43, the other end of the second connecting tube 43 is connected to the tangential separator 5, and the inner diameter of the reducing tube 42 gradually increases from the end connected to the first connecting tube 41 to the end connected to the second connecting tube 43. The reducing tube 42 can gradually reduce the air flow velocity therein, thereby increasing the residence time of the tobacco in the sublimation tube 4.

[0036] Specifically, the inner diameter of the reducer 42 is 500-540 mm, that is, the inner diameter of one end of the reducer 42 connected to the first connecting pipe 41 is 500 mm, and the inner diameter of one end of the reducer 42 connected to the second connecting pipe 43 is 540 mm. The diameter of the outlet portion of the existing reducer 42 is 730 mm. Since the diameter of the tube suddenly increases, the cross-sectional area through which the process gas flows increases. Under the condition of unchanged air volume, the wind pressure gradient of the process gas per unit time decreases rapidly, resulting in a serious attenuation of the wind speed of the process gas in the reducer 42. The tobacco runs at a low speed and stays in the sublimation tube 4 for too long, resulting in the tobacco being retained in the sublimation tube 4 and being repeatedly heated. The moisture content of the expanded tobacco is low and charred tobacco blocks may be produced, resulting in a risk of combustion at the hot end. After reducing the inner diameter of the outlet, the taper of the reducer 42 is reduced, and the amount of wind speed reduction is reduced, which can avoid the tobacco from being repeatedly heated in the sublimation tube 4, increase the moisture content of the expanded tobacco, and reduce crushing.

[0037] Embodiment 3

[0038] This embodiment is similar to the first embodiment or the second embodiment, except that the mixing pipeline is provided with a steam interface, and the steam interface is externally connected to a steam station for supplying steam to the mixing pipeline through the steam pipeline. For the drying process of expanded tobacco, in order to ensure the humidity of the process gas used to dry the tobacco and avoid the tobacco from burning during the drying process, the steam station is used to add steam to the high-temperature process gas in the mixing pipeline through the steam pipeline, thereby ensuring that the process gas has appropriate humidity.

[0039] Specifically, the steam station includes a steam-water separator, which is connected to the steam pipeline. The added steam has high requirements, which should not contain excess water, and the stability of steam supply should be guaranteed. While the steam is supplied through the steam station, the steam and water are separated through the steam-water separator to improve the steam dryness, thereby improving the quality of the process gas and reducing the fluctuation of the moisture content of the tobacco caused by the excess moisture in the steam.

[0040] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A tobacco expansion system, comprising an impregnation device, a feed air lock, a venturi tube (3), a sublimation tube (4), a tangential separator (5), a discharge air lock, a rehumidification device, a process fan, a combustion furnace, and a mixing pipeline, wherein the impregnation device is connected to the feed air lock, the feed air lock is connected to the venturi tube (3), the two ends of the venturi tube are respectively connected to the mixing pipeline and the sublimation tube (4), the sublimation tube (4), the discharge air lock, and the process fan are respectively connected to the tangential separator (5), the discharge air lock is connected to the rehumidification device, the combustion furnace and the mixing pipeline are respectively connected to the process fan, and the combustion furnace is connected to the mixing pipeline; characterized in that The mixing pipeline comprises a transverse pipe (2) and an inverted U-shaped gantry pipe (1); the combustion furnace and the process fan are respectively connected to one end of the gantry pipe (1); the other end of the gantry pipe (1) is connected to the transverse pipe (2); and the transverse pipe (2) is connected to the Venturi pipe (3).

2. The tobacco expansion system according to claim 1, characterized in that: The plane where the center line of the gantry tube (1) is located forms an angle with the vertical plane where the center line of the cross tube (2) is located, and the end of the gantry tube (1) connected to the cross tube (2) extends in a direction away from the feed air lock.

3. The tobacco expansion system according to claim 1, characterized in that: It also includes an anemometer, which is installed on the transverse pipe (2).

4. The tobacco expansion system according to claim 1, characterized in that: Both ends of the transverse pipe (2) are gradually inclined toward the middle of the transverse pipe (2), and a sewage outlet is provided at the bottom end of the middle of the transverse pipe (2).

5. The tobacco expansion system according to claim 1, characterized in that: The sublimation tube (4) comprises a first connecting tube (41), a reducing tube (42) and a second connecting tube (43); one end of the first connecting tube (41) is connected to the Venturi tube (3); the other end of the first connecting tube (41) is connected to one end of the reducing tube (42); the other end of the reducing tube (42) is connected to the second connecting tube (43); and the other end of the second connecting tube (43) is connected to the tangential separator (5).

6. The tobacco expansion system according to claim 5, characterized in that: The inner diameter of the reducer (42) is 500-540 mm, and the inner diameter of the reducer (42) gradually increases from the end connected to the first connecting pipe (41) to the end connected to the second connecting pipe (43).

7. The tobacco expansion system according to any one of claims 1 to 6, characterized in that: The mixing pipeline is provided with a steam interface, and the steam interface is externally connected to a steam station for supplying steam to the mixing pipeline through a steam pipeline.

8. The tobacco expansion system according to claim 7, characterized in that: The steam station comprises a steam-water separator, and the steam-water separator is connected to the steam pipeline.

9. The tobacco expansion system according to any one of claims 1 to 6, characterized in that: The operating frequency range of the process fan is 35 to 40 Hz.

10. The tobacco expansion system according to any one of claims 1 to 6, characterized in that: A cooling vibration groove is also provided between the discharge air lock and the moisture regaining device.

Images