CN113654337B - Sectional type hot air low-speed convection type silk drying device and operation method thereof - Google Patents

Sectional type hot air low-speed convection type silk drying device and operation method thereof Download PDF

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Publication number
CN113654337B
CN113654337B CN202111114883.5A CN202111114883A CN113654337B CN 113654337 B CN113654337 B CN 113654337B CN 202111114883 A CN202111114883 A CN 202111114883A CN 113654337 B CN113654337 B CN 113654337B
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hot air
fixed bed
tobacco
section
speed
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CN113654337A (en
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唐军
易斌
林文强
高晓华
何邦华
周冰
谭国治
王晓辉
李雯琦
李惠天
唐丽
马宁
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China Tobacco Yunnan Industrial Co Ltd
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China Tobacco Yunnan Industrial Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
    • F26B17/1408—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the gas being supplied and optionally extracted through ducts extending into the moving stack of material
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/10—Roasting or cooling tobacco
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Manufacture Of Tobacco Products (AREA)

Abstract

The invention discloses a sectional type hot air low-speed convection type silk drying device which comprises a fixed bed (7) divided into a first section positioned at the lower end and a second section positioned at the upper end, wherein the upper end of the side wall of the second section of the fixed bed (7) is connected with a feeding device (3), and the lower end of the side wall of the first section of the fixed bed (7) is connected with a first combustion furnace (1) through a first hot air pipeline (2); the lower end of the side wall of the second section of the fixed bed (7) is connected with a second combustion furnace (13) through a second hot air pipeline (14); the top of the fixed bed (7) is connected with a moisture-removing air pipe (10); the bottom is connected with a discharging and conveying device (9); the upper end of the interior of the fixed bed (7) is provided with a circumferential loosening device (6) which is connected with the feeding inclined tube (5). According to the invention, tobacco is heated in a low-speed vertical upward convection mode by hot air, and the tobacco drying time and the tobacco drying temperature in a fixed bed are controlled by regulating and controlling the speed and the temperature of the hot air, so that the tobacco drying quality and the tobacco drying stability can be effectively improved.

Description

Sectional type hot air low-speed convection type silk drying device and operation method thereof
Technical Field
The invention belongs to the technical field of tobacco processing, and particularly relates to a sectional type hot air low-speed convection type silk drying device and an operation method thereof.
Background
The cut tobacco baking is a key process in the cut tobacco manufacturing process, and the processing strength of the cut tobacco baking has a great influence on the sensory quality of cigarettes. At present, the tobacco shred drying equipment mainly comprises a roller tobacco shred drying device and an air flow tobacco shred drying device, wherein the roller tobacco shred drying device adopts a combination of a cylinder wall heat conduction mode and a hot air convection mode to heat tobacco shreds, the tobacco shred drying temperature is generally lower than 150 ℃, the tobacco shred drying time is 4-6 min, the tobacco shred aroma after drying is kept better, the tobacco shred filling value is lower, and the phenomenon of head drying and tail drying exists (namely, the situation that the moisture content of the tobacco shreds after drying is lower exists in a beginning section and an ending section of the tobacco shred drying); the air flow tobacco shred drying device adopts a hot air convection mode to dry tobacco shreds at high temperature and fast, the hot air temperature is higher, the tobacco shred drying time is generally about 200 ℃, the tobacco shred drying time is 1-3 s, the tobacco shred filling value after drying is higher, and meanwhile, the tobacco miscellaneous gas removal is more obvious, but the tobacco shred drying device is unfavorable for keeping the herbal fragrance of tobacco. Therefore, aiming at the advantages and disadvantages of the roller tobacco shred drying device and the air flow tobacco shred drying device, whether a tobacco shred drying device for realizing 'slow baking with small fire' exists or not, the problems that the aroma quality is improved but the filling performance is low, the filling performance of the air flow tobacco shred drying device is good and the aroma loss is large in the existing roller tobacco shred drying device are solved, and the tobacco flavor, the tobacco shred filling value performance, the tobacco shred moisture content stability and the like are both considered.
The present invention has been made to solve the above-described problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention develops a sectional type hot air low-speed convection type tobacco shred drying device, realizes a heating mode that hot air is heated from bottom to top uniformly for tobacco materials, effectively keeps tobacco fragrance, simultaneously gives consideration to tobacco shred filling values, can improve uniformity and accuracy of tobacco shred drying, achieves the aim of effectively improving tobacco shred drying effect, and has remarkable practical significance for promoting tobacco shred drying processing technology development.
The aim of the invention is achieved by the following technical scheme.
The first aspect of the invention provides a sectional type hot air low-speed convection type silk drying device, which comprises a first combustion furnace 1, a second combustion furnace 13, a fixed bed 7 and a feeding device 3;
the fixed bed 7 is divided into a first section positioned at the lower end and a second section positioned at the upper end;
the upper end of the side wall of the second section of the fixed bed 7 is provided with a feed inlet 71 which is connected with the feeding equipment 3 through a feed inclined pipe 5,
the lower end of the first section side wall of the fixed bed 7 is provided with a first air inlet 72 which is connected with the first combustion furnace 1 through a first hot air pipeline 2;
the lower end of the second section side wall of the fixed bed 7 is provided with a second air inlet 75 which is connected with the second combustion furnace 13 through a second hot air pipeline 14;
the top of the fixed bed 7 is provided with an air outlet 73 which is connected with the moisture-removing air pipe 10;
the bottom of the fixed bed 7 is provided with a discharge port 74 which is connected with the discharge conveying device 9 through a discharge pipe 12;
the fixed bed 7 has a peripheral loosening device 6 at its upper inner end, which is connected to the feed chute 5.
Preferably, the feeding inclined tube 5 is provided with a feeding airlock 4; the discharging pipe 12 is provided with a discharging airlock 8; the moisture discharging air pipe 10 is provided with a moisture discharging valve 11.
Preferably, the first air inlet 72 and the second air inlet 75 are located at two sides of the fixed bed 7, respectively.
Preferably, the fixed bed 7 comprises a middle cylindrical main body and tapered cones at the upper end and the lower end, and the first air inlet 72 is positioned at the tapered cones at the lower end of the fixed bed 7.
Preferably, the first hot air pipeline 2 is inclined upwards towards the feed inlet 71, and the angle between the first hot air pipeline 2 and the central axis of the fixed bed 7 is 30-60 degrees;
the second hot air pipeline 14 is inclined upwards towards the feeding hole 71, and the angle between the second hot air pipeline 14 and the central axis of the fixed bed 7 is 45-60 degrees.
The two angles are referred to herein as: the angle of the first hot air duct 2 in the diagonal direction is positive and the angle of the second hot air duct 14 in the diagonal direction is positive.
Preferably, the feeding device 3 is arranged directly above the feeding airlock 4.
Preferably, the wind speed of the hot air entering the first section of the fixed bed 7 through the first hot air pipeline 2 is relatively low, the wind speed of the hot air is adjustable within the range of 0-2 m/s, and the regulation and control precision is 0.10 m/s;
the temperature of the hot air entering the first section of the fixed bed 7 through the first hot air pipeline 2 is adjustable within the range of 110-130 ℃, and the regulation precision is 0.10 ℃.
Preferably, the air speed of the hot air entering the second section of the fixed bed 7 through the second hot air pipeline 14 is relatively high, the air speed of the hot air is adjustable within the range of 2-5 m/s, and the regulation precision is 0.10 m/s;
the temperature of the hot air entering the second section of the fixed bed 7 through the second hot air pipeline 14 is adjustable within the range of 130-160 ℃, and the regulation precision is 0.10 ℃.
Preferably, the tobacco entering the feeding device 3 may be one or a mixture of tobacco leaves, tobacco stems, sheets, cut tobacco, cut stems, cut sheet, etc.
The second aspect of the invention provides an operation method of the hot air low-speed convection type silk drying device of the first aspect of the invention, which comprises the following steps:
A. the first hot air enters the lower end of the first section of the fixed bed 7 through the first hot air pipeline 2 after being heated by the first combustion furnace 1 and then flows upwards along the fixed bed 7 at the speed of 0-1 m/s;
the second hot air enters the lower end of the second section of the fixed bed 7 through the second hot air pipeline 14 and the second air inlet 75 after being heated by the second combustion furnace 13, then is converged with the first hot air and flows upwards along the fixed bed 7 at a speed of 2-5 m/s;
the first hot air and the second hot air are finally discharged out of the fixed bed 7 through the air outlet 73 by the damp-discharging air pipe 10;
B. tobacco materials enter the feeding inclined tube 5 through the feeding device 3, enter the circumferential loosening device 6 through the feeding hole 71, are loosened and uniformly enter the fixed bed 7 under the action of the circumferential loosening device 6, slowly fall down along the fixed bed 7 due to the fact that the self gravity of the tobacco is larger than the buoyancy under the action of upward hot air, finally enter the discharging tube 12 through the discharging hole 74 and are discharged out of the fixed bed 7;
C. and the tobacco material is subjected to tobacco shred drying time and tobacco shred drying temperature in the fixed bed 7, and proper hot air temperature and speed are selected for matching according to the inlet moisture and flow of the tobacco material and the outlet moisture of the tobacco material, so that the tobacco shred drying effect and corresponding process requirements are finally achieved.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the hot air low-speed convection type tobacco shred drying device, tobacco materials enter the upper portion of a fixed bed through the feeding port, the feeding airlock and the feeding inclined tube, and are loosened and uniformly moved downwards under the action of circumferential loosening equipment and gravity, so that the tobacco materials are uniformly heated in the fixed bed, and the uniformity and stability of tobacco moisture at a tobacco shred drying outlet are effectively improved.
2. The hot air low-speed convection type tobacco shred drying device adopts a low-speed and low-temperature mode and a mode that tobacco shred drying time is longer, and realizes a tobacco 'slow fire' drying mode. Compared with the traditional airflow type tobacco shred drying device, the tobacco shred drying device has a good tobacco fragrance-preserving effect, and the stability of the moisture content of the exported tobacco is good; compared with the traditional roller tobacco drying device, the tobacco filling performance is better, the dry head and dry tail amount is less, and the tobacco is not contacted with the fixed bed and basically not crushed.
3. The sectional type hot air low-speed convection type tobacco shred drying device adopts the mode of strong treatment of high temperature and long action time (high buoyancy generated by high hot air speed and low tobacco descending speed) of the first section hot air and weak treatment of the second section hot air at a slightly low temperature and in an action time period, so that the effect of quickly drying and improving the drying effect and filling performance of tobacco in the first section can be realized, and the effects of slightly slowly drying and improving the moisture control of the tobacco and reducing the breakage of the tobacco in the second section can be realized.
4. According to the hot air low-speed convection type tobacco shred drying device, the heating intensity and the heating time of tobacco in a fixed bed can be controlled by adjusting the temperature and the speed of hot air, so that the tobacco shred drying effect is effectively improved, the quality and the stability of a tobacco shred drying process are improved, and the tobacco shred drying device has good application value and practical significance.
5. The invention also has the characteristics of simple structure, practical method, strong operability, small occupied space, easy site reconstruction and the like.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the hot air low-speed convection silk drying device of the invention.
Reference numerals illustrate: 1-a first combustion furnace; 2-a first hot air duct; 3-feeding equipment; 4-feeding airlock; 5-feeding inclined tube; 6-circumferential loosening equipment; 7-a fixed bed; 8-discharging airlock; 9-a discharging and conveying device; 10-a moisture removal air pipe; 11-a moisture removal valve; 12-a discharge pipe; 13-a second combustion furnace; 14-a second hot air duct; 71-a feed inlet; 72-a first air inlet; 73-an air outlet; 74-a discharge hole; 75-a second air inlet.
Detailed Description
The invention is further illustrated in the following drawings and examples, which are not intended to limit the scope of the invention, but are intended to be any adaptations or modifications based on the teachings of the invention.
Example 1
As shown in fig. 1, the device used in the embodiment is a sectional type hot air low-speed convection type silk drying device, which comprises a first combustion furnace 1, a second combustion furnace 13, a fixed bed 7 and a feeding device 3; the fixed bed 7 is divided into a first section positioned at the lower end and a second section positioned at the upper end; the upper end of the second section side wall of the fixed bed 7 is provided with a feed inlet 71 which is connected with the feeding equipment 3 through a feed inclined pipe 5, and the lower end of the first section side wall of the fixed bed 7 is provided with a first air inlet 72 which is connected with the first combustion furnace 1 through a first hot air pipeline 2; the lower end of the second section side wall of the fixed bed 7 is provided with a second air inlet 75 which is connected with the second combustion furnace 13 through a second hot air pipeline 14; the top of the fixed bed 7 is provided with an air outlet 73 which is connected with the moisture-removing air pipe 10; the bottom of the fixed bed 7 is provided with a discharge port 74 which is connected with the discharge conveying device 9 through a discharge pipe 12; the fixed bed 7 has a peripheral loosening device 6 at its upper inner end, which is connected to the feed chute 5.
The feeding inclined pipe 5 is provided with a feeding airlock 4; the discharging pipe 12 is provided with a discharging airlock 8; the moisture discharging air pipe 10 is provided with a moisture discharging valve 11. The first air inlet 72 and the second air inlet 75 are respectively located at two sides of the fixed bed 7. The fixed bed 7 comprises a middle cylindrical main body and tapered cones at the upper end and the lower end, and the first air inlet 72 is positioned at the tapered cones at the lower end of the fixed bed 7. The first hot air pipeline 2 is obliquely upwards towards the feeding port 71, and the angle between the first hot air pipeline 2 and the central axis of the fixed bed 7 is 45 degrees; the second hot air pipe 14 is inclined upwards towards the feeding hole 71, and the angle between the second hot air pipe 14 and the central axis of the fixed bed 7 is 45 degrees. The feeding device 3 is arranged right above the feeding airlock 4.
The diameter of the fixed bed 7 is 2m, and the height is 4m; the wind speed of hot air entering the fixed bed 7 through the first hot air pipeline 2 is 1.0m/s, and the temperature of the hot air is 120 ℃; the air speed of the hot air entering the fixed bed 7 through the second hot air pipeline 14 is 3.0m/s, and the temperature of the hot air is 140 ℃; the opening of the moisture removal valve 11 is 50%; the flow rate of the tobacco material entering the feeding device 3 is 2000kg/h.
The experimental object is cut tobacco of 6000 cut tobacco production line kg of a certain cigarette factory, the moisture content of the cut tobacco is 20.8%, the standard requirement of the moisture content of the cut tobacco after baking is 13.0+/-1.0%, and the filling value of the cut tobacco is more than or equal to 4.2g/cm 3 . Cut tobacco is divided into two equal parts, and cut tobacco is subjected to tobacco drying treatment by adopting a traditional roller tobacco drying device and the invention, and the comparison of the treated results is shown in table 1.
Figure SMS_1
As can be seen from Table 1, compared with the traditional roller tobacco drying device, the central value of the moisture content of the tobacco is closer to the standard requirement after the tobacco is dried by adopting the roller tobacco drying device, and the tolerance range is narrower, so that the stability of the moisture content of the tobacco is better; the cut tobacco filling value is higher, the cut tobacco breakage amount is smaller, and the sensory quality scores of the cut tobacco are basically the same. Therefore, compared with the traditional roller tobacco shred drying device, the hot air low-speed convection tobacco shred drying device has obvious advantages in the aspects of improving the quality stability of the tobacco shred drying process, improving the tobacco shred filling performance, reducing the tobacco shred raw material consumption in the tobacco shred drying process and the like.
Example 2
Example 1 was repeated with the following differences: the wind speed of hot air entering the fixed bed 7 through the first hot air pipeline 2 is 2.0m/s, and the temperature of the hot air is 110 ℃; the wind speed of the hot air entering the fixed bed 7 through the second hot air pipeline 14 is 4.0m/s, and the temperature of the hot air is 145 ℃; the opening of the moisture removal valve 11 is 60%.
The experimental object is cut tobacco of 6000 cut tobacco production line kg of a certain cigarette factory, the moisture content of the cut tobacco is 21.2%, the standard requirement of the moisture content of the cut tobacco after baking is 13.0+/-1.0%, and the filling value of the cut tobacco is more than or equal to 4.2g/cm < 3 >. Cut tobacco is divided into two equal parts, and cut tobacco is subjected to tobacco drying treatment by adopting a traditional airflow tobacco drying device and the invention, and the comparison of the treated results is shown in Table 2.
Figure SMS_2
As can be seen from Table 2, compared with the traditional air flow tobacco drying device, the central value of the moisture content of the tobacco shreds is closer to the standard requirement after the tobacco shreds are dried by adopting the air flow tobacco drying device, and the tolerance range is narrower, so that the stability of the moisture content of the tobacco shreds is better; the sensory quality score of the tobacco shreds is higher, which indicates that the tobacco shreds have better effect of keeping the herbal fragrance of the cigarettes; the cut tobacco adopted by the invention has less broken quantity and slightly lower filling performance. Therefore, compared with the traditional airflow tobacco shred drying device, the hot air low-speed convection tobacco shred drying device has obvious advantages in the aspects of improving the quality stability of tobacco shred drying process, keeping the herbal fragrance of tobacco, improving the sensory quality of tobacco shreds, reducing the consumption of tobacco shred raw materials in the tobacco shred drying process and the like.
By combining the embodiment 1 and the embodiment 2, the hot air low-speed convection tobacco shred drying device can make up for the defects of the roller tobacco shred drying device and the air flow tobacco shred drying device, can effectively improve the uniformity and the accuracy of tobacco shred drying, can effectively keep the fragrance of tobacco herbs, and also gives consideration to the filling value of tobacco shreds, thereby effectively improving the tobacco shred drying effect.

Claims (3)

1. The sectional type hot air low-speed convection type silk drying device is characterized by comprising a first combustion furnace (1), a second combustion furnace (13), a fixed bed (7) and a feeding device (3);
the fixed bed (7) is divided into a first section positioned at the lower end and a second section positioned at the upper end;
the upper end of the side wall of the second section of the fixed bed (7) is provided with a feed inlet (71) which is connected with the feed equipment (3) through a feed inclined pipe (5),
the lower end of the side wall of the first section of the fixed bed (7) is provided with a first air inlet (72), and the first air inlet is connected with the first combustion furnace (1) through a first hot air pipeline (2);
the lower end of the second section side wall of the fixed bed (7) is provided with a second air inlet (75), and the second air inlet is connected with the second combustion furnace (13) through a second hot air pipeline (14);
an air outlet (73) is formed in the top of the fixed bed (7) and is connected with a moisture-removing air pipe (10);
the bottom of the fixed bed (7) is provided with a discharge hole (74) which is connected with a discharge conveying device (9) through a discharge pipe (12);
the upper end of the inside of the fixed bed (7) is provided with a circumferential loosening device (6) which is connected with the feeding inclined tube (5);
a feeding airlock (4) is arranged on the feeding inclined tube (5); a discharging airlock (8) is arranged on the discharging pipe (12); the moisture-discharging air pipe (10) is provided with a moisture-discharging valve (11);
the first air inlet (72) and the second air inlet (75) are respectively positioned at two sides of the fixed bed (7);
the fixed bed (7) comprises a cylindrical main body in the middle and tapered conical bodies at the upper end and the lower end, and the first air inlet (72) is positioned at the tapered conical body at the lower end of the fixed bed (7);
the first hot air pipeline (2) obliquely faces upwards to the feeding port (71), and the angle between the first hot air pipeline (2) and the central shaft of the fixed bed (7) is 30-60 degrees;
the second hot air pipeline (14) obliquely faces upwards to the feeding port (71), and the angle between the second hot air pipeline (14) and the central shaft of the fixed bed (7) is 45-60 degrees;
the feeding device (3) is arranged right above the feeding airlock (4);
the air speed of the hot air entering the first section of the fixed bed (7) through the first hot air pipeline (2) is relatively low, the air speed of the hot air is adjustable within the range of 0-1 m/s, and the regulation and control precision is 0.10 m/s;
the temperature of the hot air entering the first section of the fixed bed (7) through the first hot air pipeline (2) is adjustable within the range of 110-130 ℃, and the regulation precision is 0.10 ℃;
the air speed of the hot air entering the second section of the fixed bed (7) through the second hot air pipeline (14) is relatively high, the air speed of the hot air is adjustable within the range of 2-5 m/s, and the regulation and control precision is 0.10 m/s;
the temperature of the hot air entering the second section of the fixed bed (7) through the second hot air pipeline (14) is adjustable within the range of 130-160 ℃, and the regulation precision is 0.10 ℃.
2. The hot air low-speed convection type cut tobacco drying device according to claim 1, wherein the tobacco entering the feeding equipment (3) can be one or a mixture of several of tobacco leaves, tobacco stems, slices, cut tobacco, cut stems and slice shreds.
3. A method of operating a low-velocity convection filament drying apparatus of any of claims 1-2, comprising the steps of:
A. the first hot air enters the lower end of the first section of the fixed bed (7) through the first hot air pipeline (2) through the first air inlet (72) after being heated by the first combustion furnace (1), and then flows upwards along the fixed bed (7) at the speed of 0-1 m/s;
the second hot air enters the lower end of the second section of the fixed bed (7) through a second air inlet (75) through the second hot air pipeline (14) after being heated by the second combustion furnace (13), is then converged with the first hot air, and flows upwards along the fixed bed (7) at a speed of 2-5 m/s;
the first hot air and the second hot air are finally discharged out of the fixed bed (7) through the air outlet (73) by the moisture-discharging air pipe (10);
B. tobacco materials enter the feeding inclined tube (5) through the feeding equipment (3), enter the circumferential loosening equipment (6) through the feeding port (71), are loosened and uniformly enter the fixed bed (7) under the action of the circumferential loosening equipment (6), slowly fall down along the fixed bed (7) due to the fact that the self gravity of the tobacco is greater than the buoyancy under the action of upward hot air, finally enter the discharging tube (12) through the discharging port (74), and are discharged out of the fixed bed (7);
C. and the tobacco material is dried in the fixed bed (7) for a certain time and a certain temperature, and the proper temperature and speed of hot air are selected for matching according to the inlet moisture and flow of the tobacco material and the outlet moisture of the tobacco material, so that the tobacco drying effect and the corresponding process requirements are finally achieved.
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CN203828046U (en) * 2014-05-15 2014-09-17 秦皇岛烟草机械有限责任公司 Airflow type tobacco shred drying device with positive-pressure feeding
CN105410980A (en) * 2014-09-17 2016-03-23 豪尼机械制造股份公司 Device And Method For Drying Tobacco Material
CN210399885U (en) * 2019-07-24 2020-04-24 秦皇岛烟草机械有限责任公司 Collision drying device for airflow drying equipment

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB463060A (en) * 1935-09-20 1937-03-22 Alec Henry Rowles Improvements relating to the drying and conditioning of cereals and other substances
CN2304879Y (en) * 1997-08-22 1999-01-20 诸暨市浣纱金属钣厂 Grain drier by air circulation
CN2601163Y (en) * 2003-01-06 2004-01-28 徐均佑 Stepped temp difference dryer
DE102006012577A1 (en) * 2006-03-16 2007-09-20 Hauni Maschinenbau Ag Drying device for tobacco
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