CN113115968B - Cut tobacco drying tower, tower type airflow cut tobacco dryer, cut tobacco manufacturing system and tobacco production system - Google Patents

Abstract

The disclosure relates to the technical field of cigarette cut tobacco making equipment, in particular to a cut tobacco drying tower, a tower type airflow cut tobacco dryer, a cut tobacco making system and a tobacco production system. The drying silk tower comprises a tower body, wherein a feeding hole and a discharging hole are formed in the tower body, and the side wall, adjacent to the discharging hole, of the tower body is gradually inclined outwards along the direction that materials flow from the feeding hole to the discharging hole. Based on the method, the uniformity of the moisture distribution of the cut tobacco at the discharge port of the cut tobacco drying tower can be effectively improved.

Description

Cut tobacco drying tower, tower type airflow cut tobacco dryer, cut tobacco manufacturing system and tobacco production system

Technical Field

The disclosure relates to the technical field of cigarette cut tobacco making equipment, in particular to a cut tobacco drying tower, a tower type airflow cut tobacco dryer, a cut tobacco making system and a tobacco production system.

Background

The tower type air flow cut tobacco dryer is equipment for drying cut tobacco in a cut tobacco drying tower by utilizing high-temperature air flow, has the advantages of short drying time, high heat efficiency, good drying effect and the like, and particularly has great advantages in the aspect of processing large batches of cut tobacco.

However, in practice, when the cut tobacco flows out from a discharge hole of the cut tobacco drying tower, the problem of uneven moisture distribution of the cut tobacco exists, and the quality of the finished cut tobacco is affected.

Disclosure of Invention

One technical problem to be solved by the present disclosure is: and the uniformity of the moisture distribution of tobacco shreds at the discharge port of the tobacco drying tower is improved.

In order to solve the technical problem, the first aspect of the present disclosure provides a drying silk tower, which comprises a tower body, wherein a feeding hole and a discharging hole are arranged on the tower body, and the side wall of the tower body adjacent to the discharging hole is gradually inclined outwards along the direction of the material flowing from the feeding hole to the discharging hole.

In some embodiments, the tower body comprises a first tower section and a second tower section, the feed inlet and the discharge outlet are respectively arranged on the first tower section and the second tower section, and the side wall of one side of the second tower section, which is provided with the discharge outlet, is inclined outwards.

In some embodiments, a sidewall of the second tower section opposite the discharge port extends vertically.

In some embodiments, the tower body further comprises a third tower section connected between the first tower section and the second tower section, the cross-sectional area of the third tower section gradually increasing along a direction from the first tower section to the second tower section.

In some embodiments, the side wall of the first tower section extends vertically.

In some embodiments, the feed inlet is located below the discharge outlet.

In some embodiments, the feed inlet and the discharge outlet are disposed on opposite sides of the column.

A second aspect of the present disclosure provides a tower air flow cut tobacco dryer comprising a cut tobacco dryer of an embodiment of the present disclosure.

A third aspect of the present disclosure provides a wire making system comprising a tower air flow cut tobacco dryer of an embodiment of the present disclosure.

A fourth aspect of the present disclosure provides a tobacco production system comprising a thread making system of embodiments of the present disclosure.

According to the embodiment of the disclosure, through improving the structure of the tobacco drying tower, the side wall of the tobacco drying tower adjacent to the discharge hole is changed from vertical to outwards inclined, so that the uniformity of the flow velocity distribution of tobacco shreds at the discharge hole of the tobacco drying tower can be effectively improved, and the uniformity of the moisture distribution of the tobacco shreds at the discharge hole of the tobacco drying tower can be effectively improved.

Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the disclosure, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present disclosure, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic diagram of a tower-type air-flow cut tobacco dryer in the related art.

Fig. 2 shows a structure of a related art wire drying tower.

Fig. 3 is a top view of fig. 2.

Fig. 4 illustrates the structure of a drying tower in an embodiment of the present disclosure.

Fig. 5 is a top view of fig. 4.

Fig. 6 is a cloud chart of the discharge velocity profile of the drying tower of fig. 2.

Fig. 7 is a cloud chart of the discharge velocity profile of the drying tower of fig. 4.

Reference numerals illustrate:

10. tower type air flow cut tobacco dryer;

1. a material homogenizing device; 2. vibrating grooves; 3. an expansion device; 4. a silk drying tower; 5. a gas-material separator; 6. a centrifugal fan; 7. an incinerator; 8. a screw conveyor; 91. a feed airlock; 92. a discharging airlock;

41. a feed inlet; 42. a discharge port; 43. a first tower section; 44. a second tower section; 45. a third tower section; 46. a tower body.

Detailed Description

The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without carrying out the inventive task are within the scope of protection of this disclosure.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In the description of the present disclosure, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and to simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be configured and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present disclosure; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

In the description of the present disclosure, it should be understood that the use of terms such as "first," "second," etc. for defining components is merely for convenience in distinguishing corresponding components, and the terms are not meant to be construed as limiting the scope of the present disclosure unless otherwise indicated.

In addition, technical features related to different embodiments of the present disclosure described below may be combined with each other as long as they do not make a conflict with each other.

In a tobacco production system, a tower type airflow cut tobacco dryer (Comas Tower Dryer, CTD) is an important component of a tobacco making system, and utilizes high-temperature convection gas to rapidly dry moisture in tobacco shreds, so that the tobacco shreds reach a required moisture content, remove tobacco shred miscellaneous gas, increase a filling value of the tobacco shreds and improve the quality of the tobacco shreds.

Fig. 1 shows a structure of a tower type air current cut tobacco dryer in the related art. The open arrow in fig. 1 indicates the flow direction of the cut tobacco; the dashed arrows indicate the injection direction of the water vapor; the solid arrows indicate the flow direction of the process gas.

As shown in fig. 1, the tower type airflow cut tobacco dryer 10 comprises a material homogenizing device 1, a vibrating tank 2, an expansion device 3, a cut tobacco drying tower 4 (also called a drying tower), a gas-material separator 5, a centrifugal fan 6, an incinerator 7, a screw conveyor 8, a feeding airlock 91 and a discharging airlock 92.

Wherein, the material homogenizing device 1, the vibration groove 2, the expansion device 3, the wire drying tower 4 and the gas-material separator 5 are sequentially communicated along the material flow direction. A feed airlock 91 is provided between the tank 2 and the expansion device 3. The discharging airlock 92 is arranged at the material outlet of the gas-material separator 5. The air flow outlet of the air-material separator 5 is communicated with the incinerator 7 through a centrifugal fan 6. The incinerator 7 is communicated with the wire drying tower 4 and the expansion device 3. The screw conveyor 8 is arranged at the lower part of the silk drying tower 4.

The homogenizer 1 is used for opening materials. The vibration tank 2 is a high-frequency vibration tank and is used for further loosening materials. The expansion device 3 absorbs moisture and expands the cut tobacco by using the injected high-pressure steam. The tobacco shred drying tower 4 uses high-temperature process gas to dehydrate and dry the expanded tobacco shreds. The gas separator 5 separates the dried cut tobacco from the gas. The centrifugal fan 6 sends the gas separated by the gas-material separator 5 to the incinerator 7 to recycle part of the hot gas discharged by the centrifugal fan 6. The incinerator 7 incinerates and heats the gas to supply heat to the entire system. The process gas flowing out of the incinerator 7 is divided into two paths, one path enters the expansion device 3 (shown by a first solid arrow on the left side in fig. 1) and is premixed with tobacco shreds sent from the vibration groove 2, so that the conveying capacity of the expansion device 3 to the tobacco shreds is improved, and the other path enters the tobacco drying tower 4 (shown by a second solid arrow on the left side in fig. 1) to convey and dry the tobacco shreds entering the tobacco drying tower 4 from the expansion device 3.

When the tobacco shred drying device works, as shown by a hollow arrow in fig. 1, tobacco shreds enter the vibrating groove 2 after being opened by the material homogenizing device 1, enter the expansion device 3 through the feeding airlock 91 after being further loosened by the vibrating groove 2, are sprayed by a venturi tube in the expansion device 3, generate partial negative pressure by partial process gas mixed steam (as shown by a broken line arrow in fig. 1), are mixed with the tobacco shreds, fully absorb moisture and expand in the expansion device 3, and are pushed to the tobacco shred drying tower 4. And then the cut tobacco is conveyed in the cut tobacco drying tower 4 by high-temperature air flow, is rapidly dehydrated, dried and shaped in the conveying process, and sundries such as stones mixed in the cut tobacco are discharged through the screw conveyor 8. The mixture of the cut tobacco and the gas flowing out of the cut tobacco drying tower 4 flows to the gas-material separator 5, and the gas-material separator 5 separates the cut tobacco from the gas. The separated cut tobacco is discharged by the discharge airlock 92 and flows to the next process of the cut tobacco making system. And part of the separated air flow flows to the incinerator 7 through the centrifugal fan 6, is reheated and continuously participates in circulation.

It can be seen that the cut tobacco dryer 4 is an important component of the tower-type air flow cut tobacco dryer 10. The general structure of the drying tower 4 is shown in fig. 2-5. As shown in fig. 2-5, the silk drying tower 4 comprises a tower body 46, and a feed inlet 41 and a discharge outlet 42 are arranged on the tower body 46. The feed inlet 41 is communicated with the expansion device 3 to realize the communication between the wire drying tower 4 and the expansion device 3, so that materials can enter the wire drying tower 4 through the expansion device 3. The discharge opening 42 is generally rectangular and communicates with the air-material separator 5 to allow communication between the drying wire tower 4 and the air-material separator 5 so that material can flow from the drying wire tower 4 to the air-material separator 5. Meanwhile, an air inlet (not shown) is further formed in the tower body 46, and the air inlet is located at the opposite side of the feed inlet 41 and is communicated with the incinerator 7, so that the wire drying tower 4 is communicated with the incinerator 7, and process air flowing out of the incinerator 7 can flow into the wire drying tower 4 through the air inlet.

Specifically, as shown in FIGS. 2-5, the tower 46 includes a first tower section 43 and a second tower section 44. The feed inlet 41 and the discharge outlet 42 are arranged on a first tower section 43 and a second tower section 44, respectively. The air inlet is arranged on the first tower section 43. And, the tower 46 further includes a third tower section 45. The third tower section 45 is connected between the first tower section 43 and the second tower section 44. Wherein the first tower section 43 is substantially straight with its side walls extending vertically. The cross-sectional areas of the first tower section 43 and the second tower section 44 are unequal. At this time, the third tower section 45 forms a transition between the first tower section 43 and the second tower section 44, which are different in cross-sectional area. For example, in fig. 2 and 4, the cross-sectional area of the first tower section 43 is smaller than the cross-sectional area of the second tower section 44, and at this time, the cross-sectional area of the third tower section 45 gradually increases in the direction from the first tower section 43 to the second tower section 44, and is substantially tapered.

As shown in fig. 1, the drying tunnel 4 is disposed generally vertically, i.e., the longitudinal central axis of the drying tunnel 4 extends generally in an up-down direction. As can be seen from fig. 1, 2 and 4, the inlet 41, outlet 42 and inlet of the drying tower 4 are located on the side wall of the tower 46. And, the feed inlet 41 is located the below of discharge gate 42, and the air intake is located the below of feed inlet 41, and at this moment, first tower section 43 is located the below of second tower section 44, and first tower section 43, third tower section 45 and second tower section 44 are arranged in proper order along the orientation from bottom to top. In this way, the process gas flowing into the tower 46 from the incinerator 7 flows from bottom to top, in the process, the process gas can meet and mix with the tobacco shreds entering the tower 46 from the expansion device 3, the tobacco shreds are driven to flow from bottom to top, suspension conveying of the tobacco shreds is achieved, meanwhile, the high-temperature process gas takes away moisture in the tobacco shreds, rapid drying of the tobacco shreds is achieved, and the dried tobacco shreds flow out from the discharge hole 42 at the upper part.

In some embodiments, an orifice plate cross-flow device (not shown in the figure) and an annular air homogenizing device (not shown in the figure) are further arranged below the feeding hole 41 in the tower body 46 to balance the wind speed and form uniform wind.

Although the tower type airflow cut tobacco dryer 10 can achieve better drying and shaping effects, in actual use, the problem of uneven moisture exists in cut tobacco at the outlet of the cut tobacco drying tower 4, wherein the moisture of the outlet cut tobacco is unevenly distributed in the up-down direction and the left-right direction on the cross section of the discharge hole 42. And tracking the water fluctuation condition of the outlet of a batch of tobacco shreds, and finding that the water standard deviation reaches 0.2751.

Although some measures are adopted in the related art to solve the problem of uneven distribution of the moisture in the cut tobacco at the outlet, most of the measures start from the aspects of changing the inlet layout of the process gas and the like, and the structure of the cut tobacco drying tower 4 is not improved.

The inventor finds that the structure of the tobacco drying tower 4 is also an important reason for influencing the uniformity of the moisture distribution of the cut tobacco.

As shown in fig. 2, in the related art, the discharge port 42 protrudes outward from the side wall of the second tower section 44, and the side wall of the second tower section 44 adjacent to the discharge port 42 extends vertically to be a straight wall, and at this time, the discharge port 42 and the side wall of the second tower section 44 adopt a straight wall connection mode. It is found that in this case, the cut tobacco impacts the top of the tower at a high speed during the flow to the discharge port 42, and the cut tobacco turns back, and in this process, the flow velocity of the cut tobacco is higher at the upper part and lower at the lower part when viewed from the cross section of the discharge port 42, so that the flow velocity of the cut tobacco is in up-down asymmetric distribution, and the moisture of the cut tobacco at the outlet is unevenly distributed up-down. That is, it has been found that the straight wall connection between the outlet 42 and the side wall of the second tower section 44 is an important cause of uneven distribution of the moisture in the cut tobacco at the outlet.

In addition, as shown in fig. 3, in the related art, an included angle of approximately 90 ° is formed between the normal direction of the inlet 41 and the normal direction of the outlet 42. It was found that in this case, at the discharge port 42, the flow rate of tobacco on the side close to the feed port 41 (i.e., the left side in fig. 3) is low, and the flow rate of tobacco on the side far from the feed port 41 (i.e., the right side in fig. 3) is high, so that the flow rate of tobacco is in a left-right asymmetric distribution when seen from the cross section of the discharge port 42, and the moisture of the tobacco at the outlet is unevenly distributed. That is, it is found that the arrangement of the inlet 41 and the outlet 42 at 90 ° is an important cause of uneven distribution of the moisture in the cut tobacco at the outlet.

Based on the findings, the structure of the tobacco drying tower 4 is improved, so that the uniformity of the moisture distribution of tobacco shreds at the outlet of the tobacco drying tower is improved, and the quality of finished tobacco shreds is improved.

Fig. 4-5 schematically illustrate the structure of the drying tunnel 4 in an embodiment of the present disclosure.

For the problem of uneven distribution of the moisture in the cut tobacco at the outlet, referring to fig. 4, in some embodiments, along the direction of the material flowing from the inlet 41 to the outlet 42 (i.e., along the direction from bottom to top in fig. 4), the side wall of the tower 46 adjacent to the outlet 42 is gradually inclined outwards. Specifically, as shown in fig. 4, in some embodiments, the sidewall (labeled a in fig. 4) of the side of the second tower section 44 on which the tap hole 42 is provided is inclined outwardly. The side wall of the second tower section 44 opposite the outlet 42 (denoted b in fig. 4) is not inclined, but extends still vertically.

In the above arrangement, the side wall of the second tower section 44 is gradually inclined towards the discharge port 42 instead of adopting the straight wall connection mode, and at this time, the side wall of the second tower section 44 adjacent to the discharge port 42 is inclined towards the discharge port 42, and slowly transits instead of right-angle rigid bending, so that in the process that the cut tobacco flows towards the discharge port 42, the side wall a can guide the airflow to flow along the inclined inner wall surface, and finally smoothly transits to the discharge port 42, so that the pressure is gradually released, thereby reducing the speed non-uniformity of the upper side and the lower side of the discharge port to a certain extent, effectively improving the up-down distribution uniformity of the flow velocity of the cut tobacco at the outlet, and improving the up-down distribution uniformity of the cut tobacco moisture at the outlet.

In addition, referring to fig. 5, in some embodiments, the inlet 41 and the outlet 42 are disposed on opposite sides of the tower 46.

Based on the above arrangement, the normal direction of the feeding hole 41 and the discharging hole 42 is no longer 90 degrees, but 180 degrees, in other words, the normal directions of the feeding hole 41 and the discharging hole 42 are no longer perpendicular to each other, but parallel to each other, so that the feeding and discharging directions of the tobacco drying tower 4 are not bent and distributed in a forward direction, thereby reducing the speed difference caused by the 90-degree distribution of the feeding and discharging directions, effectively improving the distribution uniformity of the flow velocity of the tobacco at the outlet, and improving the distribution uniformity of the moisture at the outlet tobacco.

Under the condition that the side wall of the tower body 46 adjacent to the discharge hole 42 is gradually inclined outwards, and the feed hole 41 and the discharge hole 42 are arranged on two opposite sides of the tower body 46, the uniformity of the vertical distribution of the cut tobacco at the outlet can be improved, the uniformity of the horizontal distribution of the cut tobacco at the outlet can be improved, and therefore the uniformity of the water distribution of the cut tobacco at the outlet can be improved more effectively.

Fig. 6 and 7 show simulated cloud diagrams of tobacco flow velocity distribution at the outlet of the tobacco drying tower before and after modification. Comparing fig. 6 and 7, it can be seen that the outlet tobacco velocity is about 36.25m/s on the left side before modification, the maximum value is reduced to 34.42m/s after modification, and the peak regions of the velocities on the left and right sides are significantly eliminated.

As can be seen, the embodiment of the disclosure breaks through the defect of unreasonable discharging mode of the tobacco drying tower 4 in the related art, improves the structure of the tobacco drying tower 4 according to the motion characteristics of tobacco in the tobacco drying tower 4, especially the tower top, redesigns the discharging direction and the transition structure, can effectively improve the uniformity of tobacco discharging, improves the quality of tobacco, and improves the refined processing level of the tower type airflow tobacco dryer 10.

The foregoing description of the exemplary embodiments of the present disclosure is not intended to limit the present disclosure, but rather, any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.

Claims (10)

1. A cut tobacco drying tower (4) of a tower-type air flow cut tobacco dryer (10), characterized by comprising:

the tower body (46), be equipped with feed inlet (41) and discharge gate (42) on tower body (46), discharge gate (42) by the lateral wall of tower body (46) outwards protrudes, and follows the material by feed inlet (41) flow direction of discharge gate (42), the lateral wall of tower body (46) with the lateral wall that discharge gate (42) is adjacent slope outwards gradually.

2. The wire drying tower (4) according to claim 1, wherein the tower body (46) comprises a first tower section (43) and a second tower section (44), the feed inlet (41) and the discharge outlet (42) are respectively arranged on the first tower section (43) and the second tower section (44), and the side wall of the side of the second tower section (44) provided with the discharge outlet (42) is inclined outwards.

3. The drying tower (4) according to claim 2, characterized in that a side wall of the second tower section (44) opposite the outlet opening (42) extends vertically.

4. The wire drying tower (4) according to claim 2, characterized in that the tower body (46) further comprises a third tower section (45), the third tower section (45) being connected between the first tower section (43) and the second tower section (44), the cross-sectional area of the third tower section (45) gradually increasing in the direction from the first tower section (43) to the second tower section (44).

5. The drying tower (4) according to claim 2, characterized in that the side wall of the first tower section (43) extends vertically.

6. The drying tower (4) according to claim 1, characterized in that the feed opening (41) is located below the discharge opening (42).

7. The drying tower (4) according to any one of claims 1-6, wherein the inlet (41) and the outlet (42) are provided on opposite sides of the tower body (46).

8. A tower-type air-flow cut tobacco dryer (10), characterized by comprising a cut tobacco drying tower (4) according to any one of claims 1-7.

9. A wire making system comprising a tower air dryer (10) according to claim 8.

10. A tobacco production system comprising the tobacco processing system of claim 9.

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