CN110037327B - Tobacco flake redrying equipment and tobacco flake redrying method - Google Patents
Tobacco flake redrying equipment and tobacco flake redrying method Download PDFInfo
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- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
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Abstract
The invention discloses tobacco flake redrying equipment and a tobacco flake redrying method. The tobacco flake drying and drying system comprises a tobacco flake conveying system, a dehydration drying system, a dehumidification system and a cooling system, wherein the dehydration drying system comprises a plurality of groups of radio frequency heating units, and each group of radio frequency heating units can perform radio frequency heating redrying on tobacco flakes passing through the dehydration drying system; the moisture removal system is used for removing moisture removed from the tobacco flakes after radio frequency heating and redrying; the cooling system is used for cooling the tobacco flakes which are heated, redried and dehumidified to reach the target moisture content; the tobacco lamina transport system is used to transport tobacco lamina along a predetermined process path. The thick tobacco flakes can be penetrated and stacked by the radio frequency electromagnetic wave energy, so that the whole interior and exterior of the tobacco flakes are uniformly heated, more electromagnetic wave energy relative to the lower region of the moisture content can be gathered in the region with larger local moisture content in the tobacco flakes, the temperature and the dehydration drying speed of the high moisture content region of the tobacco flakes are higher than those of the lower moisture content region in the heating process, and the moisture content uniformity of the whole dehydrated and dried tobacco flakes is higher.
Description
Technical Field
The invention relates to the technical field of tobacco processing, in particular to tobacco flake redrying equipment and a tobacco flake redrying method.
Background
Threshing and redrying are important links in the tobacco industry chain, the upstream is tobacco leaf production, raw material base construction, and the downstream is butt-jointed cigarette production and manufacturing, which play an important bridge role for the Chinese cigarette brand raw material guarantee, while tobacco flake redrying is a main production process on a threshing and redrying production line, is a necessary processing process for converting agricultural products into cigarette industry production raw materials after tobacco leaves are harvested, and is a key link of tobacco leaf processing. The redrying has the functions of improving the quality of the tobacco leaves and ensuring the commodity safety of the tobacco leaves. In threshing and redrying production, the primary-baked raw tobacco is subjected to loosening and moistening, screening, stem and leaf separation and redrying to obtain finished tobacco strips, and the finished tobacco strips are packaged and output. The tobacco flake redrying is to bake tobacco flakes subjected to threshing (stem and leaf separation processing) and wind separation in a redryer to remove excessive water in the tobacco flakes, so that the water content and the temperature of the tobacco flakes meet the specified requirements of subsequent storage and alcoholization. In the redrying process of the tobacco flakes, the mould and the worm eggs can be killed to different degrees, and green miscellaneous gas in the tobacco flakes is removed. The process determines the physical quality and sensory quality of the tobacco flakes to a certain extent, and is also a production link with higher energy consumption in the threshing and redrying production line.
At present, in domestic and foreign tobacco industry enterprises generally use convection heat exchange redrying equipment such as mesh belt type redrying machines, air flow drying machines, drum drying machines and the like in redrying production, the process of removing excessive moisture in tobacco flakes utilizes steam heat energy provided by a heat supply boiler to heat air through a heat exchanger to reduce the humidity of the air, when the tobacco flakes containing moisture are contacted with high-temperature dry air flow heated by the heat exchanger, the temperature of tobacco leaves is increased along with the increase of the temperature of the tobacco leaves, so that the moisture in the tobacco flakes is vaporized and diffused to the surface and escapes, the moisture on the surface of the tobacco leaves is continuously taken away by the high-temperature dry air flow flowing through the surface of the tobacco flakes, and the heat is transferred to the tobacco flakes, so that the moisture in the tobacco flakes is continuously vaporized and escapes, and the purpose of removing the moisture in the tobacco flakes is achieved. The mesh belt type redrying machine used in the conventional tobacco flake redrying production is divided into functional working areas such as preheating, drying, cooling, moisture regaining and the like, tobacco flakes to be redried enter the redrying machine along with the movement of a mesh belt, are preheated and heated under the action of hot air flow, then enter the drying area, are subjected to excessive moisture removal under the action of high-temperature dry air flow, enter the cooling area to be cooled after the moisture content reaches a certain critical moisture content requirement, and finally, in the moisture regaining working area, the moisture content, the uniformity, the temperature and the like of the tobacco flakes reach the specified requirements by utilizing high-temperature high-humidity circulating air flow, so that the redrying process is finished.
In the preheating and drying processes of the existing redrying equipment and production technology, the heat exchange mode between air and tobacco flakes is convective heat exchange, namely high-temperature dry air outside the tobacco flakes flows through the surfaces of the tobacco flakes to transfer heat to the tobacco flakes and heat the tobacco flakes from the outside of the tobacco flakes, the heat transfer direction is opposite to the diffusion escape direction of moisture in the tobacco flakes, the production efficiency is influenced to a certain extent, and the energy consumption is increased; in the existing redrying equipment and the process production process, tobacco flakes are conveyed in a redrying machine through a mesh belt, high-temperature dry air flow for heating the tobacco flakes is respectively blown downwards (upper air inlet) from the upper part of the mesh belt or blown upwards (lower air inlet) from the lower part of the mesh belt to convey the tobacco flakes on the mesh belt, so that the tobacco flakes are uniformly heated in conveying, the stacking thickness of the tobacco flakes is limited, and the production efficiency is influenced; in the heating process, hot air flow is blown to the surfaces of the tobacco flakes accumulated on the conveying net belt, so that the floating wind speed of the tobacco flakes is limited, the accumulated tobacco flakes cannot be blown through, the tobacco flakes at different parts are heated unevenly, and the uniformity of the water content of the tobacco flakes is influenced; the convection heat exchange mode is to transfer heat to the tobacco flakes from the outside, the production efficiency can be improved only by improving the temperature of air flow, but the physical quality and the sensory quality of the tobacco flakes are influenced by overhigh temperature, and the production efficiency is restricted; the existing redrying equipment and the process tobacco flake heating mode are convection heat exchange, high-temperature dry air outside the tobacco flake flows through the surface of the tobacco flake to transfer heat to the tobacco flake, the surface of the tobacco flake is heated and then dehydrated to easily form hard shells, so that the tobacco flake is irregularly shrunk and crushed, the physical quality of the tobacco flake is influenced, the existing production process reduces the influence of irregular shrinkage of the tobacco flake by a mode of cooling after drying and then dampening, the redrying time is prolonged, and the energy consumption is increased; the tobacco leaves are separated from tobacco stems in the threshing process of stem and leaf separation, but the tobacco leaves still contain a large number of veins which are slightly smaller than main tobacco stems, the thickness, density and water content of the veins are greatly different from those of the tobacco leaves, the drying rate is lower than that of the tobacco leaves, the drying time is prolonged for the veins (small tobacco stems) in the tobacco leaves to reach the specified water content in the production process, so that the tobacco leaves are excessively dried, and the target water content requirement is reached through cooling and moisture regaining, so that the energy consumption is increased invisibly, and the production efficiency is reduced. Around the above problems in the tobacco sheet redrying production, technicians in the tobacco production industry in China make a lot of research and improvement, strive to optimize process parameters on the basis of not changing the redrying mode, and overcome the defects of the traditional mesh belt redrying mode.
Chinese patent CN1012540226 discloses an airflow type tobacco sheet redrying method and device, the method adopts three sections of airflow drying chambers connected in series, independent control is carried out on the temperature, humidity and flow velocity of hot air media in different drying sections, tobacco sheets can be directly dried to the requirement of target moisture content, and excessive drying of leaves is avoided. The drying device has the advantages of uniform drying and high drying speed, and reduces the cooling and moisture regaining procedures compared with a mesh belt type redrying machine. Because the moisture content difference between the tobacco flakes and the tobacco stems is large, the air flow redrying time is short, and the tobacco stems in the tobacco flakes containing the tobacco stems are slowly dehydrated, the moisture content difference between the tobacco flakes and the tobacco stems after redrying is large; the airflow drying has high air speed, great impact on tobacco flakes, high tobacco flake crushing rate, overlong process flow, difficulty in adapting to the requirement of high-flow tobacco flake treatment and high energy consumption.
Chinese patent CN1025996256 discloses a method and a device for directly drying and redrying tobacco flakes, wherein a roller drying mode (namely roller redrying) is adopted in the method. The roller redrying is a contact type internal heating conduction type drying mode, in the drying process, heat is transferred to the surface of the inner wall from the interlayer of the inner wall of the roller, air in the heating cylinder is transferred to dried tobacco flakes attached to the inner wall surface of the continuously rotating cylinder body, and the moisture of the tobacco flakes is removed. The drying drum is internally provided with a forward shoveling plate, so that the tobacco flakes are continuously shoveled and sprayed down in the rotation process of the drum body and fully contacted with hot air flow, the tobacco flakes are uniformly heated, the tobacco flakes are directly dehydrated to the target moisture content without cooling and moisture regaining, and the drying drum also has obvious advantages in reducing drying energy consumption and simplifying redrying process; the phenomenon that the moisture content of the tobacco sheets containing stems is different from that of tobacco stems exists, the moisture content of the cured tobacco sheets is greatly different from that of the stems, and meanwhile, compared with mesh-belt hot air redrying, the cured tobacco sheets are high in shrinkage rate, low in large-medium sheet rate, long in redrying time and incapable of adapting to large-scale production.
Chinese patent CN1659985 discloses a method for tobacco threshing and redrying by microwave technology, the tobacco sheet redrying of the method is completed by microwave heating technology drying: uniformly spreading the tobacco flakes on a mesh belt, and then drying the tobacco flakes by microwaves to ensure that the moisture of the tobacco flakes is dried to 11-13%. The method is helpful for solving the problem of uneven moisture content of the dried tobacco leaves caused by different moisture content of the tobacco leaves before drying, different positions of the tobacco leaves and the like. However, the microwave drying equipment is limited by the manufacturing power of the existing magnetron, and the penetration depth of the microwave into the tobacco flakes is only about 10 cm, so that the industrial production requirement of large-flow redrying is difficult to realize; the service life of a magnetron, which is a main component of microwave drying equipment, is limited, the power is attenuated to be below 80 percent after 1 to 2 years, the magnetron needs to be replaced, and the maintenance and use cost is high.
In conclusion, the existing tobacco flake redrying production mode has various technical problems to be solved urgently, such as complex redrying process, uneven water content of products, large tobacco flake shrinkage, high possibility of breakage and loss, low production efficiency, high energy consumption, influence on cigarette processing effect and the like. Currently, the tobacco industry develops into a new historical stage, new development advantages of Chinese cigarettes are cultivated, strategic tasks such as Chinese cigarette upgrading innovation are realized, new requirements are provided for cigarette processing, compared with other links of a cigarette production industry chain, the threshing and redrying technology is obviously delayed in development, and a new redrying technology which can obviously improve the homogenization of redried tobacco slices, effectively eliminate green miscellaneous gas and has excellent appearance physical quality and sensory evaluation quality is urgently needed to replace the existing redrying technology.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a tobacco piece redrying device and a tobacco piece redrying method.
In order to achieve the above object, a first aspect of the present invention provides a piece of tobacco redrying equipment, where the piece of tobacco redrying equipment includes a piece of tobacco conveying system, a dehydration drying system, a dehumidification system, and a cooling system, where the dehydration drying system includes a plurality of groups of radio frequency heating units, and each group of radio frequency heating units can perform radio frequency heating redrying on a piece of tobacco passing through the dehydration drying system;
the moisture removing system is used for removing moisture removed from the redried tobacco flakes;
the cooling system is used for cooling the tobacco flakes which are heated, redried and dehumidified to reach the target moisture content;
the tobacco flake conveying system is used for conveying the tobacco flakes along a preset process path.
Optionally, each group of the radio frequency heating units includes a heating cavity and a radio frequency generator, and the radio frequency generator can provide radio frequency energy into the heating cavity to perform radio frequency heating redrying on the tobacco flakes in the heating cavity.
Optionally, the dehydration drying system further includes a plurality of groups of auxiliary hot air units, and each group of auxiliary hot air units can assist in heating the tobacco flakes passing through the dehydration drying system.
Optionally, each group of auxiliary hot air units comprises an auxiliary heat source, an airflow circulating fan, an air pipe and a hot air spray pipe, the air pipe is respectively connected with the airflow circulating fan and the hot air spray pipe, and an air outlet of the hot air spray pipe is arranged corresponding to the tobacco flakes; wherein the content of the first and second substances,
the airflow circulating fan can suck the hot air generated by the auxiliary heat source into the air pipe and convey the hot air into the hot air spray pipe.
Optionally, the dehumidification system includes a plurality of groups of dehumidification units, and each group of dehumidification unit corresponds to at least one group of the radio frequency heating unit.
Optionally, every group the hydrofuge unit all includes the hydrofuge fan and with hydrofuge pipeline and the hydrofuge cover that the hydrofuge fan is connected, the hydrofuge cover sets up the smoked sheet conveying system top.
Optionally, the cooling system includes a cooling cavity, a low-temperature air generator connected to the cooling cavity, and a low-temperature air nozzle disposed in the cooling cavity.
Optionally, the smoked sheet redrying equipment further comprises a detection and control system for controlling the actual redrying processing technological process of the smoked sheets according to preset technological parameters.
Optionally, the detection and control system comprises an air flow and ambient temperature sensor, an air flow and ambient humidity sensor, a tobacco flake temperature sensor and a tobacco flake moisture content sensor.
In a second aspect of the present invention, there is provided a tobacco flake redrying method, comprising:
s1, providing tobacco flakes;
s2, carrying out radio frequency heating redrying on the tobacco flakes;
s3, removing moisture removed from the tobacco flakes subjected to radio frequency heating and redrying;
and S4, cooling the tobacco flakes subjected to heating and redrying and moisture removal to reach the target moisture content, so as to complete the tobacco flake redrying process.
The tobacco flake redrying equipment and the tobacco flake redrying method comprise a tobacco flake conveying system, a dehydration drying system, a moisture discharging system and a cooling system, wherein the dehydration drying system comprises a plurality of groups of radio frequency heating units, and each group of radio frequency heating units can perform radio frequency heating redrying on tobacco flakes passing through the dehydration drying system; the moisture removing system is used for removing moisture removed from the redried tobacco flakes; the cooling system is used for cooling the tobacco flakes which are redried and dehumidified to reach the target moisture content; the tobacco flake conveying system is used for conveying the tobacco flakes along a preset process path. The invention adopts radio frequency to redry the tobacco flakes, which means that electromagnetic waves with the frequency of 3 kHz-300 MHz penetrate through the interior of the tobacco flakes to cause the oscillation and the migration of polar molecules and charged ions in the tobacco flakes, electric energy is converted into heat energy, and the tobacco flakes are heated by the heat energy. The thick tobacco flakes can be penetrated and stacked by the radio frequency electromagnetic wave energy, so that the whole interior and exterior of the tobacco flakes are uniformly heated, more electromagnetic wave energy relative to the lower region of the moisture content can be gathered in the region with larger local moisture content in the tobacco flakes, the temperature and the dehydration drying speed of the high moisture content region of the tobacco flakes are higher than those of the lower moisture content region in the heating process, and the moisture content uniformity of the whole dehydrated and dried tobacco flakes is higher. The radio frequency heating technology heats from the area with higher water content in the tobacco flakes to ensure that the temperature gradient in the tobacco flakes is consistent with the migration direction of water, which is beneficial to the rapid migration of water to the surface and realizes the rapid drying. The radio frequency heating redrying can remove the redundant moisture in the tobacco flakes at a lower tobacco flake temperature in a shorter time, and has the characteristics of strong penetrating power, selective heating, uniform heating and uniform moisture content of the tobacco flakes after redrying.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a tobacco redrying apparatus according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of a method for redrying tobacco flakes according to the present invention.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1, a first aspect of the present invention relates to a tobacco piece redrying apparatus, which includes a tobacco piece conveying system 3, a dehydration drying system, a dehumidifying system, and a cooling system. The dehydration drying system comprises a plurality of groups of radio frequency heating units, and each group of radio frequency heating units can perform radio frequency heating redrying on tobacco flakes 2 passing through the dehydration drying system. The moisture removal system is used for removing moisture removed from the redried tobacco flakes 2. The cooling system is used for cooling the tobacco flakes 2 which reach the target moisture content after redrying and dehumidifying. The tobacco lamina transport system 3 is used to transport the tobacco lamina 2 along a predetermined process path.
Specifically, as shown in fig. 1, when the tobacco flakes 2 are redried, the tobacco flake conveying system 3 conveys the tobacco flakes 2 into the dehydration drying system, and then the radio frequency heating unit in the dehydration drying system performs radio frequency heating redrying on the tobacco flakes 2 to dehydrate and dry the tobacco flakes 2 so that the tobacco flakes 2 reach a predetermined moisture content. And then, the tobacco flake conveying system 3 continuously conveys the tobacco flakes 2 to a dehumidifying system, and the dehumidifying system carries out removing treatment on the moisture removed by the tobacco flakes 2 so as to reduce and remove the moisture in the tobacco flakes 2 and adjust the moisture content of the tobacco flakes 2 to the target moisture content. Finally, the tobacco flake conveying system 3 conveys the tobacco flakes 2 to a cooling system, and the cooling system can cool the tobacco flakes 2 after redrying through low-temperature air and the like, so that the temperature of the tobacco flakes 2 can be reduced to the temperature meeting the requirements of boxing until the redrying process of the tobacco flakes 2 is completed, and the redried tobacco flakes 12 are formed.
The radio frequency heating and redrying of the tobacco flakes refers to that electromagnetic waves with the frequency of 3kHz to 300MHz penetrate through the interior of the tobacco flakes to cause oscillation and migration of polar molecules and charged ions in the tobacco flakes, electric energy is converted into heat energy, and the tobacco flakes are heated by the heat energy. The thick tobacco flakes can be penetrated and stacked by the radio frequency electromagnetic wave energy, so that the whole interior and exterior of the tobacco flakes are uniformly heated, more electromagnetic wave energy relative to the lower region of the moisture content can be gathered in the region with larger local moisture content in the tobacco flakes, the temperature and the dehydration drying speed of the high moisture content region of the tobacco flakes are higher than those of the lower moisture content region in the heating process, and the moisture content uniformity of the whole dehydrated and dried tobacco flakes is higher. The radio frequency heating technology heats from the area with higher water content in the tobacco flakes to ensure that the temperature gradient in the tobacco flakes is consistent with the migration direction of water, which is beneficial to the rapid migration of water to the surface and realizes the rapid drying. The radio frequency heating redrying can realize the drying of the tobacco flakes within a shorter time at a lower tobacco flake temperature, and has the characteristics of strong penetration capability, selective heating, uniform heating and uniform water content after drying.
Therefore, the smoked sheet redrying equipment in this embodiment adopts radio frequency heating redrying smoked sheet to compare with current traditional convection heat transfer heating mode, has following advantage:
1. the tobacco flakes are heated selectively from the area with relatively high internal water content, the moisture migration direction is consistent with the temperature gradient of the tobacco flakes, so that the tobacco flakes are dried quickly, the drying speed of part of veins (small tobacco stems) with higher water content in the tobacco flakes is higher than that of the tobacco flakes, the tobacco flakes can be dried to the specified water content synchronously, and the uniformity of the water content is improved effectively;
2. the temperature of the radio-frequency heating redried tobacco flakes is relatively low, so that the non-uniformity and the breakage rate of the shrinkage rate of the tobacco flakes can be reduced, the chemical quality of the tobacco flakes is slightly influenced, the escape of miscellaneous gas in the tobacco flakes along with the migration of water is facilitated, and the inherent aroma of the tobacco flakes is effectively maintained;
3. the radio-frequency heating redried tobacco flakes can ensure that the integral moisture content uniformity and temperature of the tobacco flakes can meet the specified requirements without cooling and moisture regain regulation, greatly reduce the comprehensive energy consumption of redried production and improve the production efficiency;
4. the heating speed is high, the smoke sheet arranged in the cavity of the radio frequency heating system generates heat instantly when receiving radio frequency electromagnetic wave energy, the rapid heating can be realized within minutes or seconds, and the heat transfer process from outside to inside by convection heat exchange does not exist;
5. the heating is uniform, the electromagnetic wave energy of the radio frequency heating technology can penetrate through the interior of the stacked tobacco flakes, so that all parts of the tobacco flakes are heated simultaneously under the action of an electromagnetic field, namely the temperature rise inside and outside is consistent, and the temperature is not high and low like the heat convection of hot air in the conventional redrying mode;
6. the penetration ability is strong, the energy of the radio frequency heating electromagnetic wave can penetrate dozens of centimeters of tobacco slices, and compared with the spreading height of the existing redrying mode, the production yield can be increased by increasing the thickness of the spreading material, and the production efficiency is improved;
7. the moisture regain process is reduced, the radio frequency heating technology belongs to an internal and external simultaneous heating mode, the heating uniformity can be ensured, the selective heating characteristic is realized, the moisture content uniformity of tobacco flakes can be improved, the tobacco flakes can be dried at one time until the moisture content requirement specified by the flake tobacco storage and alcoholization process is met, and the moisture regain process is not needed;
8. the radio frequency heating redrying can directly dry the tobacco flakes to the technological requirement level, the drying temperature is lower, and the volume shrinkage and the breakage rate which cannot be recovered due to the excessive drying of the existing redrying mode can be reduced.
9. The radio frequency redrying process of the tobacco flakes can reduce the moisture regain procedure, the radio frequency heating technology has the characteristics of simultaneous heating inside and outside the tobacco flakes, selective heating, large energy penetration capacity and the like, and compared with the traditional production mode, the radio frequency redrying of the tobacco flakes can reduce energy consumption, shorten the production period and improve the production efficiency.
As shown in fig. 1, each group of the rf heating units includes a heating cavity 6 and an rf generator 5, and the rf generator 5 can provide rf energy into the heating cavity 6 to perform rf heating re-curing on the tobacco flakes 2 in the heating cavity 6.
Specifically, as shown in fig. 1, the rf generator 5 may be disposed outside the heating chamber 6, for example, the rf generator 5 may be fixedly disposed on a top wall of the heating chamber 6. Of course, besides, the rf generator 5 may be disposed at other positions of the heating chamber 6, for example, the rf generator 5 may be disposed at the lower part or both sides of the heating chamber 6, and so on.
As shown in fig. 1, the dehydration drying system further includes a plurality of groups of auxiliary hot air units, and each group of auxiliary hot air units can assist in heating the tobacco flakes 2 passing through the dehydration drying system.
Specifically, as shown in fig. 1, each set of the auxiliary hot air units includes an auxiliary heat source (not shown in the figure, the heat source is generally a heat pump or a steam heat exchanger, etc.), an air circulation fan (not shown in the figure), an air duct (not shown in the figure) and a hot air spray pipe (4,8), the air duct connects the air circulation fan and the hot air spray pipe (4,8), respectively, and an air outlet of the hot air spray pipe (4,8) is disposed corresponding to the tobacco sheet 2. The air flow circulating fan can suck the hot air generated by the auxiliary heat source into the air duct and convey the hot air into the hot air spray pipe (4,8). The air outlet of the hot air spray pipe (4,8) may comprise an upper air outlet, a lower air outlet, a transverse air outlet and the like.
The smoked sheet redrying equipment in this embodiment can also carry out auxiliary heating to smoked sheet 2 with the help of the supplementary hot-blast unit that sets up to can make smoked sheet 2 carry out dehydration drying to target moisture content after preheating fast, shorten smoked sheet redrying time, improve economic benefits.
As shown in fig. 1, the dehumidifying system includes a plurality of groups of dehumidifying units 7, and each group of dehumidifying units 7 corresponds to at least one group of the rf heating units.
Specifically, each set of the moisture exhausting unit 7 includes a moisture exhausting fan (not shown in the figure), and a moisture exhausting pipeline (not shown in the figure) and a moisture exhausting cover 7 connected to the moisture exhausting fan, and the moisture exhausting cover 7 is disposed above the tobacco flake conveying system. Of course, besides, the dehumidifying unit may also include some dehumidifying devices and the like of other structures.
The tobacco flakes are heated in the heating cavity of the radio frequency heating unit to remove partial moisture, and in the process that the tobacco flakes fall from a high position to a mesh belt of a tobacco flake conveying system at a blanking position between the heating units (the last section is the heating unit and the cooling system), auxiliary hot air blows off partial moisture removed from the tobacco flakes, and the partial moisture is sucked in a moisture exhaust cover 7 by a moisture exhaust fan and is exhausted to the outside through a moisture exhaust pipeline.
As shown in fig. 1, the cooling system includes a cooling cavity 9, a low-temperature air generator 10 connected to the cooling cavity 9, and a low-temperature air nozzle 11 disposed in the cooling cavity 9.
In particular, as shown in fig. 1, the low temperature air generator 10 may be disposed outside the cooling cavity 9, for example, on a top wall of the cooling cavity 9. Of course, besides this, the person skilled in the art can also arrange the cryogenic air generator 10 at the rest of the cooling chamber 9 according to the actual need, for example, inside the cooling chamber 9, etc.
The tobacco flake redrying equipment of the embodiment can reduce the temperature of the redried tobacco flakes to the specified temperature in accordance with boxing through the low-temperature air flow by means of the arranged cooling system.
Specifically, the smoked sheet redrying device further comprises a detection and control system (not shown in the figure) for controlling the actual processing technological parameters in the smoked sheet redrying process according to preset technological parameters.
Specifically, the detection and control system may include an air flow and ambient temperature sensor (not shown), an air flow and ambient humidity sensor (not shown), a tobacco flake temperature sensor (not shown), a tobacco flake moisture content sensor (not shown), a data acquisition and analysis system, a redrying device intelligent control system, and the like.
Specifically, the detection and control system detects and analyzes each key control parameter in the whole redrying process, compares a set value to regulate and control the running production state of each functional component of the equipment in real time, compares a measured value of the temperature of the tobacco flakes with the set value through real-time detection according to the process requirements of the standard redrying production of the tobacco flakes, and regulates and controls the starting and stopping of the radio frequency heating system in real time according to the comparison result of the measured value and the set value; comparing a tobacco flake temperature measured value and a tobacco flake water content measured value with a set value through real-time detection, and regulating and controlling the effective energy power output of the radio frequency heating system in real time according to a comparison result; comparing the difference value of the surface temperature of the tobacco flakes and the internal temperature of the tobacco flakes with a set value through real-time detection, and regulating and controlling the starting and stopping of the auxiliary hot air system and the air flow temperature in real time according to the comparison result of the two; the moisture content of the tobacco flakes and the temperature and the humidity of the air in the dehumidifying cover are detected in real time and compared with set values, and the running state of a dehumidifying system is regulated and controlled in real time according to the comparison result of the moisture content of the tobacco flakes and the temperature and the humidity of the air in the dehumidifying cover; through detecting the comparison of the measured value of the tobacco flake temperature and the set value, the temperature, the flow rate and the like of the low-temperature air cooled by the tobacco flake cooling system are regulated and controlled in real time, so that qualified products can be produced according to the preset production process specification.
In a second aspect of the present invention, as shown in fig. 2, a method for redrying tobacco flakes is provided, wherein the above-mentioned equipment for redrying tobacco flakes can be used in the method for redrying tobacco flakes, and specific reference can be made to the above-mentioned related descriptions, which are not repeated herein. The tobacco flake redrying method comprises the following steps:
s1, providing tobacco flakes.
S2, carrying out radio frequency heating redrying on the tobacco flakes.
And S3, dehumidifying the tobacco flakes subjected to radio frequency heating and redrying.
And S4, cooling the tobacco flakes which are subjected to redrying and dehumidifying treatment and reach the target moisture content, so as to finish the tobacco flake redrying process.
Specifically, the process flow of the tobacco flake redrying method is described in detail with reference to fig. 1:
1. uniformly laying the threshed tobacco flakes 2 on a tobacco flake conveying mesh belt of a tobacco flake conveying system 3 through a feeding system 1, and conveying the tobacco flakes to a radio frequency heating unit for redrying;
2. the tobacco flakes 2 enter a heating cavity 6 of the radio frequency heating unit, and after receiving the energy of electromagnetic waves generated by the radio frequency generator 5, the tobacco flakes cause the oscillation and the migration of polar molecules and charged ions in the tobacco flakes, so that electric energy is converted into heat energy, and the tobacco flakes 2 are heated by the heat energy. The tobacco flakes 2 are uniformly heated in the heating cavity 6, more electromagnetic wave energy is gathered at the part with larger local water content relative to the part with lower water content, and the temperature and the dehydration drying speed of the part with higher water content of the tobacco flakes 2 are higher than those of the part with lower water content in the heating process, so that the whole water content of the tobacco flakes 2 is dried to the specified water content meeting the requirements of storage, alcoholization and fermentation;
3. a hot air spray pipe 4 of an auxiliary hot air system is arranged in the heating cavity 6, and is used for heating the surface of a tobacco flake material pile in conveying after the tobacco flakes 2 enter the heating cavity 6, so that the environmental temperature condition which is favorable for moisture in the tobacco flakes 2 to diffuse and escape is kept;
4. the tobacco flake conveying system 3 between the radio frequency heating units in the redrying and drying process of the tobacco flakes 2 is connected with the blanking part, and a hot air spray pipe 8 of an auxiliary hot air system is arranged for blowing away the moisture discharged during the blanking of the tobacco flakes 2 and heating the tobacco flakes in the blanking and dehumidifying process to keep the tobacco flakes in a temperature state favorable for dehydration and drying;
5. and (3) moisture removal treatment: in the process of dehydrating and drying the radio-frequency heating tobacco flakes, the moisture content measurement value, the temperature measurement value, the moisture content measurement value of the tobacco flakes 2 and the air humidity measurement value in the moisture exhaust cover 7 of each radio-frequency heating unit are detected in real time, and are compared with the set values to analyze and adjust the moisture exhaust amount of the corresponding moisture exhaust system in real time, so that the moisture removed in the process of drying the tobacco flakes is continuously removed, and the tobacco flakes are placed in the condition of the specified temperature and humidity environment states.
6. The smoked sheet 2 reaching the target moisture content requirement after redrying enters a cooling cavity 9 of a cooling system, and low-temperature air generated by a low-temperature air generator 10 passes through a low-temperature air spray pipe 11, so that the temperature of the smoked sheet 2 after redrying is reduced to meet the requirements of packing and boxing;
7. after cooling treatment, the redried strip 2 with the water content and the temperature meeting the requirements of strip storage and alcoholization fermentation is output from redrying equipment;
8. the detection and control system of the tobacco flake radio-frequency redrying equipment detects and analyzes each key control parameter in the whole redrying process, regulates and controls the running production state of each functional component of the equipment in real time by comparing a set value, compares a measured value of the tobacco flake temperature with the set value by detecting the temperature of the tobacco flake in real time according to the process requirement of the tobacco flake redrying production specification, and regulates and controls the starting and stopping of the radio-frequency heating system in real time according to the comparison result of the two; the temperature measured value of the tobacco flakes and the water content measured value of the tobacco flakes are detected in real time and compared with a set value, and the effective energy power output of a radio frequency heating system is regulated and controlled in real time according to the comparison result; comparing the difference value of the surface temperature of the tobacco flakes and the internal temperature of the tobacco flakes with a set value through real-time detection, and regulating and controlling the starting and stopping of the auxiliary hot air system and the air flow temperature in real time according to the comparison result of the two; through detecting the comparison of the measured value of the tobacco flake temperature and the set value, the temperature, the flow rate and the like of the low-temperature air cooled by the tobacco flake cooling system are regulated and controlled in real time, so that qualified products can be produced according to the preset production process specification.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and such modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. The tobacco flake redrying equipment is characterized by comprising a tobacco flake conveying system, a dehydration drying system, a dehumidifying system and a cooling system, wherein the dehydration drying system comprises a plurality of groups of radio frequency heating units, and each group of radio frequency heating units can perform radio frequency heating redrying on tobacco flakes passing through the dehydration drying system;
the moisture removing system is used for removing moisture removed from the redried tobacco flakes;
the cooling system is used for cooling the tobacco flakes which are redried to reach the target moisture content;
the tobacco flake conveying system is used for conveying the tobacco flakes along a preset process path;
dehydration drying system still includes the supplementary hot-blast unit of a plurality of groups, every group supplementary hot-blast unit homoenergetic is to the process dehydration drying system's smoked sheet carries out the auxiliary heating, and is a set of at least supplementary hot-blast moisture that can blow off desorption in the smoked sheet that supplementary hot-blast unit provided extremely the system of dehumidifying specifically does: in the process that the tobacco sheets fall from a high position to a mesh belt of a tobacco sheet conveying system at the blanking position among the auxiliary hot air units, the auxiliary hot air blows off part of moisture removed from the tobacco sheets to the moisture removing system;
the tobacco flake redrying equipment further comprises a detection and control system, and is used for controlling the actual redrying processing technological process of the tobacco flakes according to preset technological parameters, and the detection and control system specifically comprises:
the detection and control system is used for regulating and controlling the starting and stopping of the radio frequency heating unit in real time according to the comparison result of the measured value and the set value of the temperature of the tobacco flakes detected in real time; and the auxiliary hot air unit is also used for regulating and controlling the starting and stopping of the auxiliary hot air unit and the air flow temperature in real time according to the comparison result of the difference value between the surface temperature of the smoked sheets and the internal temperature of the smoked sheets detected in real time and a set value.
2. The smoked sheet redrying apparatus of claim 1, wherein each set of rf heating units comprises a heating cavity and an rf generator capable of providing rf energy into the heating cavity to rf heat and redry the smoked sheet located within the heating cavity.
3. The smoked sheet redrying equipment of claim 1, wherein each group of auxiliary hot air units comprises an auxiliary heat source, an airflow circulating fan, an air pipe and a hot air spray pipe, the air pipe is respectively connected with the airflow circulating fan and the hot air spray pipe, and an air outlet of the hot air spray pipe is arranged corresponding to a smoked sheet; wherein the content of the first and second substances,
the airflow circulating fan can suck the hot air generated by the auxiliary heat source into the air pipe and convey the hot air into the hot air spray pipe.
4. The smoked sheet redrying equipment of claim 1, wherein the dehumidifying system comprises a plurality of groups of dehumidifying units, and each group of dehumidifying units corresponds to at least one group of the radio frequency heating units.
5. The smoked sheet redrying equipment of claim 4, wherein each set of moisture removal units comprises a moisture removal fan, and a moisture removal pipeline and a moisture removal cover connected with the moisture removal fan, and the moisture removal cover is arranged above the smoked sheet conveying system.
6. The smoked sheet redrying apparatus of claim 1, wherein the cooling system comprises a cooling cavity, a low temperature air generator connected to the cooling cavity, and a low temperature air nozzle disposed within the cooling cavity.
7. A tobacco sheet redrying apparatus according to any one of claims 1 to 6, wherein the detection and control system comprises an air flow and ambient temperature sensor, an air flow and ambient humidity sensor, a tobacco sheet temperature sensor and a tobacco sheet moisture content sensor.
8. A method of redrying tobacco flakes, wherein the apparatus of any one of claims 1 to 7 is used, said method comprising:
s1, providing tobacco flakes;
s2, carrying out radio frequency heating redrying on the tobacco flakes;
s3, removing moisture removed from the tobacco flakes subjected to radio frequency heating and redrying;
and S4, cooling the tobacco flakes subjected to heating and redrying and moisture removal to reach the target moisture content, so as to complete the tobacco flake redrying process.
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| CN112617267B (en) * | 2020-12-21 | 2022-03-08 | 中国农业大学 | Method and equipment for removing local moisture of case-packed tobacco flakes |
| CN114343227A (en) * | 2022-01-14 | 2022-04-15 | 北京五洲木国际实业有限公司 | Tobacco leaf processing method and device |
| EP4289291A1 (en) | 2022-06-08 | 2023-12-13 | Körber Technologies S.p.A. | Apparatus for making and/or treating a sheet made of material comprising vegetable and/or alkaloid substances, and a method for making and/or treating said sheet |
| CN117722841B (en) * | 2024-02-07 | 2024-04-19 | 云南师范大学 | Agricultural material drying method based on temperature and humidity feedback microwave control |
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| CN201830871U (en) * | 2010-10-12 | 2011-05-18 | 天水华圆制药设备科技有限责任公司 | Hook type microwave facility for drying tobacco |
| CN201911280U (en) * | 2010-10-21 | 2011-08-03 | 河南农业大学 | Tobacco microwave dampening and drying machine and combined tobacco microwave dampening and drying machine |
| CN106974318B (en) * | 2017-03-01 | 2018-06-26 | 河南中烟工业有限责任公司 | A kind of technique of high frequency and thin plate combined drying pipe tobacco |
| CN206994394U (en) * | 2017-06-30 | 2018-02-13 | 红塔烟草(集团)有限责任公司 | A kind of quick grilling apparatus of blue or green cigarette |
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Effective date of registration: 20240320 Address after: Room 451, Building 27, No. 8 Fenggu Fourth Road, Yanqing Garden, Zhongguancun, Yanqing District, Beijing, 102101 Patentee after: BEIJING WUZHOUMU INTERNATIONAL INDUSTRY Co.,Ltd. Country or region after: Zhong Guo Address before: Room 1216, Wangyuan Building, No. 56, West Fourth Ring South Road, Fengtai District, Beijing 100071 Patentee before: Beijing Foundation Stone Construction Investment Co.,Ltd. Country or region before: Zhong Guo |