CN109405506B - Incremental hot air countercurrent drying device and method - Google Patents
Incremental hot air countercurrent drying device and method Download PDFInfo
- Publication number
- CN109405506B CN109405506B CN201811376552.7A CN201811376552A CN109405506B CN 109405506 B CN109405506 B CN 109405506B CN 201811376552 A CN201811376552 A CN 201811376552A CN 109405506 B CN109405506 B CN 109405506B
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- ventilation
- air
- hot air
- hot
- tunnel
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- 238000001035 drying Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000009423 ventilation Methods 0.000 claims abstract description 96
- 239000000463 material Substances 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 4
- 241000208125 Nicotiana Species 0.000 claims description 14
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims description 14
- 238000012806 monitoring device Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 13
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 238000007602 hot air drying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
- F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
- F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
- F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
-
- 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
-
- 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/22—Tobacco leaves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to an incremental hot air countercurrent drying device and method, comprising a conveying belt, wherein a ventilation tunnel is arranged above the conveying belt, the wind direction of the ventilation tunnel is opposite to the direction of the conveying belt, a plurality of ventilation openings are arranged on the ventilation tunnel, and the ventilation openings are not on the same horizontal plane, so that the sectional areas of the ventilation tunnels are different or change along the wind direction in a certain rule, and hot air enters the ventilation tunnels from the ventilation openings at the same time, so that the wind quantity in the ventilation tunnels is incremental along the reverse flow direction relative to materials. The invention can accelerate the diffusion of the moisture on the surface of the material into the hot air, thereby improving the drying and dewatering efficiency of the device.
Description
Technical Field
The invention relates to a drying device, in particular to an incremental hot air countercurrent drying device and a drying method thereof.
Background
The traditional tunnel type novel tobacco material drying and processing equipment utilizes a heating method at the lower part of a conveying belt to enable moisture in a serosa paved on the conveying belt to evaporate and overflow into an upper ventilation tunnel due to heating, and then utilizes hot air with the opposite (countercurrent) conveying direction of the serosa to carry the evaporated moisture out of the equipment to achieve the dehydration process requirement purpose, as shown in fig. 1, hot air 3 enters a ventilation tunnel 4 from an air supply pipeline 5 and is discharged from an air outlet 6, and serosa 2 on the conveying belt 1 is reversely dried through the hot air 3 in the ventilation tunnel 4.
When the above-mentioned conventional hot air countercurrent mode is adopted, the hot air temperature, humidity and moisture absorption capacity curves in the ventilation tunnel are respectively shown in A, B and C in fig. 2, a represents the hot air temperature distribution curve, B represents the hot air humidity distribution curve, C represents the hot air moisture absorption capacity curve, the X axis represents the distance from each point of the ventilation tunnel in the hot air flow direction to the air outlet, and the Y axis represents the air temperature, humidity and moisture absorption capacity parameters. Along the moving direction of the conveying belt, the temperature and humidity of the hot air are increased gradually, the moisture absorption capacity is decreased gradually, and the hot air and the moisture absorption capacity are changed smoothly. The closer the distribution of the hot air parameters is to the left end of the ventilation tunnel in fig. 1, the weaker the moisture absorption capacity of the hot air is. The drying efficiency is poor, the dewatering capacity of the device is poor, and the processing quality of the tobacco sheets is affected. Therefore, there is a need for improvements in the apparatus.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an incremental hot air countercurrent drying device and method, which adopt a mode of air intake at a plurality of positions in a ventilation tunnel to improve the moisture absorption capacity of hot air, and simultaneously create turbulent flow areas of countercurrent hot air so as to improve the hot air drying rate and achieve the aim of rapid dehydration. The technical scheme of the invention is as follows:
the utility model provides an incremental type hot-blast drying device that flows in reverse, includes the conveyer belt, and the conveyer belt top is equipped with ventilation tunnel, and ventilation tunnel wind direction is opposite with the conveyer belt direction, is equipped with a plurality of vents on the ventilation tunnel, and each vent is not on same horizontal plane for ventilation tunnel sectional area is different or is certain law along the wind direction and changes, and hot-blast gets into ventilation tunnel from each vent simultaneously.
Further, a plurality of ventilation openings on the ventilation tunnel are distributed in a step-type manner, and the sectional area of the ventilation tunnel is gradually increased along the wind direction.
Further, one end of the ventilation tunnel is provided with an air supply pipeline, the other end of the ventilation tunnel is provided with an air outlet, hot air of the air supply pipeline is converged into the ventilation tunnel through each ventilation opening, the hot air converged through each ventilation opening is mixed at a certain moment, and the air quantity is gradually overlapped along the wind direction.
Further, each ventilation opening is provided with an air quantity regulating valve.
Further, from the discharge end to the feed end of the conveyer belt, the air quantity in the ventilation tunnel is gradually increased, and a heating device is arranged below the conveyer belt.
Further, a plurality of temperature monitoring devices and humidity monitoring devices are arranged in the ventilation tunnel, and the temperature monitoring devices, the humidity monitoring devices and the air quantity regulating valves are all connected with the controller.
The incremental hot air countercurrent drying method based on the device is carried out as follows:
the sheet material on the conveyer belt gets into the ventilation tunnel, and ventilation tunnel wind direction is opposite with the conveyer belt direction, and hot-blast simultaneously gets into the ventilation tunnel from each vent, and the hot-blast of each vent entering is overlapped along the wind direction in proper order, collides each other at local region and forms the turbulent flow for hot-blast constantly takes place the disturbance, and gets into the end to the output from the conveyer belt, and hot-blast temperature fluctuation formula in the ventilation tunnel increases, and humidity fluctuation formula reduces.
Further, the sheet material is reconstituted tobacco.
Compared with the prior art, the invention has the following beneficial effects:
(1) The ventilation tunnel of the device provided by the invention has the advantages that the air quantity is gradually increased from the air inlet to the air outlet, and the air speeds at different sectional areas of the tunnel tend to be consistent due to the stepped ventilation tunnel structure.
(2) According to the invention, the plurality of air inlets are arranged, hot air in the ventilation tunnel is continuously increased in temperature by hot air of the plurality of air inlets, and meanwhile, the humidity is reduced, so that the moisture absorption capacity of the hot air is improved. The counterflow hot air is continuously disturbed due to the fact that the hot air is supplemented into a plurality of parts, moisture on the surface of the serosa is promoted to be dispersed into the hot air, and therefore drying speed is improved. The drying time is reduced by at least 20% compared to conventional drying methods.
(3) The device disclosed by the invention can strengthen uniform hot air drying and dehydration, and uniformly and rapidly dehydrate the reconstituted tobacco sheets moving reversely through incremental hot air countercurrent drying, so that the dehydration capability of the device is improved, and the processing quality of the tobacco sheets is improved.
Drawings
Fig. 1 is a schematic structural view of a conventional drying apparatus;
FIG. 2 is a graph showing the change in temperature, humidity and moisture absorption capacity of hot air in a conventional drying apparatus;
fig. 3 is a schematic structural view of the drying apparatus of the present invention;
fig. 4 is a graph showing the change in temperature, humidity and moisture absorption capacity of hot air in the drying apparatus according to the present invention.
Detailed Description
The technical solutions of the present embodiment will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is apparent that the described embodiment is only a part of examples of the present invention, not all examples. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 3, the incremental hot air countercurrent drying device for drying tobacco sheets in this embodiment includes a conveyor belt 1, an existing heating device is uniformly arranged below the conveyor belt 1, a ventilation tunnel 4 is arranged above the conveyor belt 1, 4 ventilation openings are arranged on the ventilation tunnel 4, an air supply pipeline 5 is communicated with the 4 ventilation openings, hot air enters the ventilation tunnel 4 from each ventilation opening, and in this embodiment, the shape of the lower part of the air supply pipeline 5 is matched with the shape of the ventilation tunnel 4. The 4 ventilation openings are arranged in a step-type manner, the first ventilation opening 8 is close to the air supply pipeline 5 and is nearest to the conveying belt 1, the distances between the second ventilation opening 9, the third ventilation opening 10 and the fourth ventilation opening 11 and the conveying belt 1 are gradually increased, and the sectional area of the ventilation tunnel is gradually increased along the wind direction.
The other end of the ventilation tunnel 4 is provided with an air outlet 6, hot air of the air supply pipeline 5 is converged into the ventilation tunnel 4 through each ventilation opening, and the air quantity is gradually overlapped along the wind direction. And each ventilation opening is provided with an air quantity regulating valve 7.
A plurality of existing temperature monitoring devices and humidity monitoring devices are further arranged in the ventilation tunnel 4, and the temperature monitoring devices, the humidity monitoring devices and the air quantity regulating valves are all connected with the controller. The temperature and humidity in the ventilation tunnel 4 are monitored in real time through the existing control mode and fed back to the controller, and then the air quantity regulating valve 7 is controlled to regulate the air quantity in real time.
The incremental hot air countercurrent drying method based on the device of the embodiment is carried out as follows:
the reconstituted tobacco sheets 2 on the conveyor belt 1 enter the ventilation tunnel 4, and the existing heater added at the bottom of the conveyor belt 1 heats the reconstituted tobacco sheets 2 uniformly paved on the conveyor belt, so that the moisture in the reconstituted tobacco sheets is evaporated. The air supply pipeline 5 provides hot air with certain temperature and humidity, the hot air enters the ventilation tunnel 4 through the first ventilation opening 8, the second ventilation opening 9, the third ventilation opening 10 and the fourth ventilation opening 11, the wind direction of the hot air 3 of the ventilation tunnel is opposite to that of the conveying belt, the hot air entering through the ventilation openings is sequentially overlapped along the wind direction, turbulence is formed by mutual collision in local areas, the hot air is continuously disturbed, the temperature fluctuation of the hot air in the ventilation tunnel is increased from the inlet end to the outlet end of the conveying belt 1, and the humidity fluctuation is reduced, as shown in fig. 4. As can also be taken from fig. 4, the hot air moisture absorption capacity gradually increases from the inlet end to the outlet end of the conveyor belt 1, and finally is discharged from the air outlet 6.
The working principle of the embodiment is specifically as follows:
the air quantity passing through the first, second, third and fourth air inlets is respectively recorded as Q1, Q2, Q3 and Q4, and the air quantity of Q1-Q4 can be adjusted by each air quantity adjusting valve 7. The hot air entering the ventilation tunnel 4 through each air inlet is mixed to form hot air 3. The air volume of the hot air in the ventilation tunnel 4 on each step section is changed, and the air volumes of all the air inlets are respectively marked as Q1', Q2', Q3', Q4' from right to left, and then the total air volume Q is formed.
Q1 'flows to the left, and when Q1' flows to the Q2 air inlet, Q2 is combined to form Q2', i.e., Q2' =q1+q2. When Q2 'flows to the air inlet of Q3, Q3' is formed by merging Q3, that is, Q3 '=q2' +q3=q1+q2+q3, and so on, the air volume is increased in the process that the hot air 3 flows from right to left in the ventilation tunnel 4. In the process of flowing the hot air 3 in the ventilation tunnel 4 from right to left, heat is transferred to the serosa 2 to cool, and moisture of the serosa of the tobacco sheet 2 is absorbed to increase humidity. At each air inlet, the vertically downward flowing new hot air (high temperature and low humidity state) and the right-to-left flowing hot air (low temperature and high humidity state) are mixed in a cross mode, and the two fluid streams collide with each other in a local area to form turbulence, so that the two fluid streams are mixed uniformly rapidly. The temperature of the mixed hot air is higher than that of the hot air flowing from right to left, and the humidity is reduced, so that the moisture absorption capacity of the mixed hot air is improved. The temperature, humidity and moisture absorption capacity of the hot air in the ventilation tunnel are shown in fig. 4. In fig. 4, a ' represents a hot air temperature distribution curve, B ' represents a hot air humidity distribution curve, and C ' represents a hot air hygroscopicity curve. In the turbulent region formed by the merging of the two streams, the disturbed hot air 3 promotes the diffusion of the moisture of the film of the tobacco sheet 2 into the hot air, thereby increasing the drying speed.
The present invention is not limited to the specific embodiments described above, but is capable of modification and variation in accordance with the scope of the present invention.
Claims (6)
1. An incremental hot air countercurrent drying device is characterized in that: the method is suitable for uniformly and rapidly dehydrating reconstituted tobacco sheets; the hot air flow device comprises a conveying belt, wherein a ventilation tunnel is arranged above the conveying belt, the wind direction of the ventilation tunnel is opposite to the running direction of the conveying belt, a plurality of ventilation openings are formed in the ventilation tunnel, and the ventilation openings are not on the same horizontal plane, so that the sectional areas of the ventilation tunnels are different or change along the wind direction in a certain rule, and hot air enters the ventilation tunnel from the ventilation openings at the same time; the ventilation tunnels are provided with a plurality of ventilation openings in a stepped mode, and the sectional areas of the ventilation tunnels are gradually increased along the wind direction; one end of the ventilation tunnel is provided with an air supply pipeline, the other end of the ventilation tunnel is provided with an air outlet, hot air of the air supply pipeline is converged into the ventilation tunnel through each ventilation opening, the hot air converged through each ventilation opening is mixed at a certain moment, and the air quantity is gradually overlapped along the wind direction;
in the process of flowing the hot air in the ventilation tunnel from right to left, transferring heat to the serosa to cool, absorbing moisture of the serosa of the reconstituted tobacco sheet and increasing humidity;
at each air inlet, the vertically downward flowing new hot air and the right-to-left flowing hot air form cross mixing, and the two fluid streams collide with each other in a local area to form turbulence, so that the two fluid streams are quickly and uniformly mixed; the temperature of the mixed hot air is higher than that of the hot air flowing from right to left.
2. The incremental hot-air countercurrent drying apparatus according to claim 1, wherein: and each ventilation opening is provided with an air quantity regulating valve.
3. The incremental hot-air countercurrent drying apparatus according to claim 1, wherein: from the discharge end to the feed end of the conveyer belt, the air quantity in the ventilation tunnel is gradually increased, and a heating device is arranged below the conveyer belt.
4. The incremental hot-air countercurrent drying apparatus according to claim 1, wherein: a plurality of temperature monitoring devices and humidity monitoring devices are further arranged in the ventilation tunnel, and the temperature monitoring devices, the humidity monitoring devices and the air quantity regulating valves are all connected with the controller.
5. Process for incremental hot-air countercurrent drying based on the apparatus according to one of claims 1 to 4, characterized in that it is carried out in the following manner:
the sheet material on the conveyer belt gets into the ventilation tunnel, and ventilation tunnel wind direction is opposite with the conveyer belt direction, and hot-blast simultaneously gets into the ventilation tunnel from each vent, and the hot-blast of each vent entering is overlapped along the wind direction in proper order, collides each other at local region and forms the turbulent flow for hot-blast constantly takes place the disturbance, and gets into the end to the output from the conveyer belt, and hot-blast temperature fluctuation formula in the ventilation tunnel increases, and humidity fluctuation formula reduces.
6. The incremental hot-air countercurrent drying method according to claim 5, wherein: the sheet material is reconstituted tobacco flakes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376552.7A CN109405506B (en) | 2018-11-19 | 2018-11-19 | Incremental hot air countercurrent drying device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376552.7A CN109405506B (en) | 2018-11-19 | 2018-11-19 | Incremental hot air countercurrent drying device and method |
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| Publication Number | Publication Date |
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| CN109405506A CN109405506A (en) | 2019-03-01 |
| CN109405506B true CN109405506B (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811376552.7A Active CN109405506B (en) | 2018-11-19 | 2018-11-19 | Incremental hot air countercurrent drying device and method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110693068B (en) * | 2019-11-11 | 2023-07-07 | 云南中烟工业有限责任公司 | Device and method for preparing reconstituted tobacco by multi-point air inlet and air outlet thick slurry method |
| CN110679981B (en) * | 2019-11-11 | 2023-05-16 | 云南中烟工业有限责任公司 | Device for preparing reconstituted tobacco by multi-point air inlet type thick slurry method and operation method thereof |
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2018
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| CN2443084Y (en) * | 2000-10-15 | 2001-08-15 | 赵县普利新型建筑构件有限公司 | Section changeable flue |
| CN101067536A (en) * | 2006-12-28 | 2007-11-07 | 张世平 | Blank drying method for dry artifical synthesizing mullite and drying equipment thereof |
| CN101619922A (en) * | 2009-07-23 | 2010-01-06 | 杭州景生木业机械有限公司 | Headwind horizontal drier |
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| 铀矿开采技术编写组编写.《铀矿开采技术》.原子能出版社,1981,(第第一版版),第363页. * |
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