CN111248480A - Mesh belt direct drying and redrying process with four drying areas - Google Patents
Mesh belt direct drying and redrying process with four drying areas Download PDFInfo
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- 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
- A24B3/04—Humidifying or drying tobacco bunches or cut tobacco
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- 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
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Abstract
The invention relates to a mesh belt type direct drying and redrying process of four drying areas, which respectively sets the original working temperature of a first drying area, the original working temperature of a second drying area, the original working temperature of a third drying area and the original working temperature of a fourth drying area; closing the first dampening area and the second dampening area at the same time; keeping the feeding amount and the moisture discharge amount unchanged; and determining to reduce the working temperature of the first drying area, the working temperature of the second drying area, the working temperature of the third drying area and the working temperature of the fourth drying area to the set temperature according to the four-drying-area cooling model. According to the technical scheme, the redrying control parameters of the four-drying-area mesh belt type direct drying redrying equipment are obtained through the four-drying-area cooling model, the moisture content of redried tobacco strips is in a specified range under the condition that the moisture return area is directly closed according to the redrying control parameters, and the technical scheme is applicable to all four-drying-area mesh belt type direct drying redrying equipment, so that the technical universality is improved.
Description
Technical Field
The invention belongs to the technical field of tobacco redrying processes, and particularly relates to a mesh belt direct drying redrying process with four drying zones.
Background
Threshing and redrying are important process means for separating leaves and stems of tobacco leaves, wherein the main process task of threshing is to separate the leaves and stems, while redrying is to use the separated leaves which are not uniformly distributed and are in a safe range, and the moisture requirement of the tobacco strips is usually 11-13%.
Most of threshing redrying lines are mesh belt type sectional redrying equipment in a redrying section, and each threshing redrying line consists of a drying area and a moisture regaining area. In the redrying equipment of the prior redrying factory, four drying areas of redrying equipment are divided according to drying areas, and the four drying areas correspond to two moisture returning areas; the five drying areas are redried equipment corresponding to the three moisture returning areas; six drying areas redrying equipment correspond to three moisture zones. For different redrying equipment, the more drying areas are, the lower redrying temperature is, and the better redrying quality is. The redrying principle is that the tobacco leaves are firstly heated slowly to dry and then gradually regained moisture.
In the redrying process, the temperature rise can cause the fragrance components of the tobacco leaves to be dissipated along with the evaporation of moisture, in order to keep the fragrance of the tobacco leaves, the current redrying process is low-temperature slow drying, in order to realize slow drying, the retention time of the tobacco leaves in redrying equipment needs to be increased, the prior art is realized by lengthening the length of a redrying section, which has greater requirements on the occupied area of a redrying plant, and meanwhile, the current redrying process does not really realize low-temperature redrying in order to ensure the moisture safety of finished tobacco strips.
In order to retain the fragrance of the tobacco leaves to the maximum extent under the condition of realizing the redrying process task, researches such as optimizing and reducing the redrying temperature are carried out, and the like, although certain results are obtained, the effect is not obvious, and the universality is poor due to the difference of equipment and raw materials of various redrying plants.
In recent years, some redrying factories realize slow baking by lengthening a baking room, but the lengthening is limited due to site reasons, the effect is not ideal, and the technical scheme is not suitable for old redrying equipment.
The existing technology provides that the single-layer mesh belt of the existing drying area is changed into an upper-lower double-layer mesh belt type structure, drying and dewatering are only carried out in a first drying area, a second drying area and a third drying area, moisture is uniform through low-temperature high-humidity and high-temperature low-humidity, the technical scheme well solves the problem of tobacco leaf aroma preservation, but the equipment universality is poor, the temperature regulation and control of each drying area are complex, and the water content of the tobacco leaves is greatly influenced by small temperature change.
Disclosure of Invention
The invention aims to provide a mesh belt type direct drying and redrying process with four drying areas, which solves the problem that the low-temperature redrying and the moisture content of tobacco leaves cannot be effectively unified in the prior art on the premise of not changing the prior equipment.
The invention adopts the following technical scheme:
a mesh belt type direct drying and redrying process with four drying areas comprises the following steps:
s1, including a first drying area, a second drying area, a third drying area, a fourth drying area, a first moisture regaining area and a second moisture regaining area;
s2, respectively setting an original working temperature T10 of a first drying area, an original working temperature T20 of a second drying area, an original working temperature T30 of a third drying area and an original working temperature T40 of a fourth drying area;
s3, closing the first dampening area and the second dampening area simultaneously;
s4, keeping the feeding amount consistent and keeping the moisture discharge amount unchanged;
s5, determining to reduce the working temperature of the first drying area to T11, reduce the working temperature of the second drying area to T21, reduce the working temperature of the third drying area to T31 and reduce the working temperature of the fourth drying area to T41 according to the four-drying-area cooling model; and (T21-T20)/T20 > (T31-T30)/T30.
Further, in the above-mentioned case,
further, in the above-mentioned case,
further, the method for establishing the four-drying-zone cooling model comprises the following steps:
s10, selecting N kinds of tobacco leaves with different varieties and different grades as tobacco leaves to be detected, wherein N is a natural number;
s11, using a mesh belt type direct redrying device with four drying areas, and setting an original working temperature T10 of a first drying area, an original working temperature T20 of a second drying area, an original working temperature T30 of a third drying area and an original working temperature T40 of a fourth drying area;
s13, closing the first dampening area and the second dampening area under the condition of ensuring that the moisture removal is unchanged;
s14, sequentially reducing the working temperature of the first drying area by M% at the same interval on the basis of the original working temperature;
similarly, the working temperature of the second drying area is reduced by K% in sequence at the same interval on the basis of the original working temperature;
reducing the working temperature of the drying three zones by P% in sequence at the same intervals on the basis of the original working temperature;
reducing the working temperature of the four drying areas to H% at the same interval on the basis of the original working temperature, and redrying;
wherein M, P, K and H are both natural numbers;
s15, counting and listing moisture results of the redried finished tobacco strips, and obtaining working temperature intervals of drying areas with qualified moisture of the redried finished tobacco strips;
s16, selecting any tobacco leaf to be detected, respectively carrying out redrying test at extreme temperature according to the working temperature interval in the step S15, and obtaining whether the moisture of the finished tobacco sheet is qualified after the redrying at the extreme temperature, wherein if the moisture of the finished tobacco sheet is qualified, the working temperature interval of each drying area is the control parameter of the mesh belt type direct redrying equipment of the four drying areas; if not, step S14 is repeated.
Further, the extreme temperature test at least comprises two tests, wherein one test is to select the highest working temperature of the first drying zone, the third drying zone and the fourth drying zone and the lowest working temperature of the second drying zone respectively; the other is that the lowest working temperature of the first drying area, the third drying area and the fourth drying area and the high and low working temperatures of the second drying area are respectively selected; and respectively carrying out a redrying test.
Further, the working temperature ranges of the first drying zone, the third drying zone and the fourth drying zone are 88% -92% of the original working temperature; the working temperature interval of the second drying area is 79-86% of the original working temperature.
The beneficial effects of this technical scheme are:
according to the technical scheme, the redrying control parameters of the four-drying-area mesh belt type direct drying redrying equipment are obtained through the four-drying-area cooling model, the moisture content of redried tobacco strips is in a specified range under the condition that the moisture return area is directly closed according to the redrying control parameters, and the technical scheme is applicable to all four-drying-area mesh belt type direct drying redrying equipment, so that the technical universality is improved.
Drawings
FIG. 1 is a graph of moisture content of finished tobacco lamina at different redrying strengths;
FIG. 2 is a schematic diagram of moisture content of a finished tobacco lamina subjected to a redrying test at an extreme temperature.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.
According to the technical scheme, through actual inspection and analysis, only the mesh belt type direct redrying equipment of four drying areas used in the existing tobacco redrying plant is aimed at, and the mesh belt type direct redrying equipment is not suitable for redrying equipment of five drying areas, six drying areas or other drying areas, and the main reasons are the characteristic that the requirement on the water content of the finished product tobacco shreds after redrying is strict, and the removal of the water in the tobacco shreds by different redrying equipment is a complex comprehensive technological process.
The four-drying-area redrying equipment used at present comprises a first drying area, a second drying area, a third drying area, a fourth drying area, a first moisture regaining area and a second moisture regaining area, and belongs to old equipment.
In the four-drying-area redrying equipment, because each section of redrying is short, the time of tobacco leaves passing through each drying area is short, so the time temperature difference of the four drying areas is not large, wherein the temperatures of the first drying area, the second drying area and the third drying area are slightly low, and the first drying area, the second drying area and the third drying area play roles in raising the temperature, reducing the temperature and buffering the temperature, and the second drying area is a main redrying working area.
In the prior four drying area redrying equipment, redrying temperature control intervals of all drying areas are already data, and excessive description is not performed, the technical scheme is that in the redrying equipment, the quantity of used redried tobacco leaves is kept consistent with the quantity of redried tobacco leaves, the working capacity of the equipment is met, the moisture discharge quantity is also kept consistent with the original redrying process, and a moisture regaining first area and a moisture regaining second area are directly closed, namely, the moisture regaining treatment is not performed on the dried tobacco leaves, and the two areas are conventional channels.
It is common knowledge in the art to set the original drying temperature T10, the original drying temperature T20, the original drying temperature T30 and the original drying temperature T40 in the first drying zone, the third drying zone and the fourth drying zone, respectively, and in the specific implementation, the temperatures of the drying zones may be different due to the different varieties or grades of the tobacco leaves to be redried.
For example, the tobacco leaf X2F (here and below are names of tobacco leaves, which are only used for distinguishing from other tobacco leaves and do not affect implementation of the technical scheme of the present application), the original working temperature of the first drying zone is 58 ℃, the original working temperature of the second drying zone is 64 ℃, the original working temperature of the third drying zone is 58 ℃, and the original working temperature of the fourth drying zone is 52 ℃; when the tobacco leaves are C3F, the original working temperature of the first drying area is 60 ℃, the original working temperature of the second drying area is 66 ℃, the original working temperature of the third drying area is 60 ℃, and the original working temperature of the fourth drying area is 53.28 ℃; when the tobacco leaves are B2F, the original working temperature of the first drying area is 70 ℃, the original working temperature of the second drying area is 75 ℃, the original working temperature of the third drying area is 68 ℃, and the original working temperature of the fourth drying area is 59 ℃.
The moisture content range of the qualified tobacco strips after redrying is determined, and the moisture content is the qualified standard with the moisture content of 11-13 percent in the application.
Combining actual production experience, because four drying areas are better and shorter, in order to ensure that the moisture content of the finished tobacco flakes is qualified, the first drying area, the second drying area and the fourth drying area are sequentially reduced by 4%, 8%, 12% and 16% on the basis of the original working temperature of the same tobacco leaves; and (3) sequentially reducing the drying second area by 7%, 14%, 21% and 28% on the basis of the original working temperature to obtain the redrying strength of each test, wherein the redrying strength is a set consisting of the temperature of the drying first area, the temperature of the drying second area, the temperature of the drying third area and the temperature of the drying fourth area, and the combined production is detailed in the following table 1:
table 1 shows the operating temperatures of the drying zones of the redrying equipment of the four drying zones
Y1, namely strength of dry one, dry three and dry four 96%, and strength of dry two 93% refers to that in the experiment with the number Y1, the working temperature of the dry one area, the dry three area and the dry four area is reduced to 96% of the original working temperature of the tobacco grade corresponding to each dry area, and simultaneously, the working temperature of the dry two area is reduced to 93% of the original working temperature.
Y2, namely, the dry first, dry third and dry fourth 92% strength, and the dry second 86% strength means that in the experiment with the serial number Y2, the working temperature of the dry first area, the dry third area and the dry fourth area is reduced to 92% of the original working temperature of the tobacco grade corresponding to each dry area, and simultaneously, the working temperature of the dry second area is reduced to 86% of the original working temperature.
Y3, namely 88% strength of dry one, dry three and dry four, and 79% strength of dry two means that in the experiment with the number Y3, the working temperature of the dry one area, the dry three area and the dry four area is reduced to 88% of the original working temperature of the tobacco grade corresponding to each dry area, and simultaneously, the working temperature of the dry two area is reduced to 79% of the original working temperature.
Y4, namely, the dry first, dry third and dry fourth 84% strength, and the dry second 72% strength means that in the experiment with the number Y4, the working temperature of the dry first area, the dry third area and the dry fourth area is reduced to 84% of the original working temperature of the tobacco grade corresponding to each dry area, and simultaneously, the working temperature of the dry second area is reduced to 72% of the original working temperature.
Listing and plotting the actual finished product tobacco slice moisture and the redrying strength of each tobacco leaf, and specifically referring to fig. 1, obtaining the redrying strength interval range within the qualified range of the finished product tobacco slice moisture, and obtaining the working temperature interval range of each drying area within the redrying strength interval range. Through analysis, the working temperature ranges of the tobacco leaves of various varieties or grades after the moisture returning area is closed are that the working temperature ranges of the first drying area, the third drying area and the fourth drying area are 88% -92% of the original working temperature of the drying areas, and the working temperature range of the second drying area is 79% -86% of the original working temperature.
In order to detect the result of the test model, two extreme experiments are used for verifying that a tobacco variety is selected optionally, the redrying strength CS1 of the first test is that 92% of the original working temperature of each drying area in the first drying area, 92% of the original working temperature of each drying area in the third drying area and the fourth drying area are used as the working temperature, and the moisture of the finished tobacco sheet is detected after redrying is carried out in the second drying area according to 79% of the original working temperature of each drying area. In the second test of redrying strength CS2, 88% of the original working temperature of each drying zone was used as the working temperature in the first drying zone, the third drying zone and the fourth drying zone, and 86% of the original working temperature was used as the working temperature in the second drying zone, and then moisture in the finished tobacco sheet was measured. The redrying results of the two experiments are shown in figure 2, and the moisture of the finished tobacco sheet is determined to be qualified and to be within the range of 11-13% under the two extreme redrying strengths.
Therefore, under the redrying equipment with four drying areas, the moisture discharge is ensured to be unchanged, the moisture returning area is closed, the first drying area, the third drying area and the fourth drying area are adjusted to 88-92% of the original working temperature, and meanwhile, the second drying area is adjusted to be within the range of 79-86% of the original working temperature, so that the direct drying and redrying can be realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A mesh belt type direct drying and redrying process with four drying areas is characterized by comprising the following steps:
s1, including a first drying area, a second drying area, a third drying area, a fourth drying area, a first moisture regaining area and a second moisture regaining area;
s2, respectively setting an original working temperature T10 of a first drying area, an original working temperature T20 of a second drying area, an original working temperature T30 of a third drying area and an original working temperature T40 of a fourth drying area;
s3, closing the first dampening area and the second dampening area simultaneously;
s4, keeping the feeding amount consistent and keeping the moisture discharge amount unchanged;
s5, determining to reduce the working temperature of the first drying area to T11, reduce the working temperature of the second drying area to T21, reduce the working temperature of the third drying area to T31 and reduce the working temperature of the fourth drying area to T41 according to the four-drying-area cooling model; and (T21-T20)/T20 > (T31-T30)/T30.
2. The mesh belt type direct drying redrying process of four drying zones of claim 1,
3. the mesh belt type direct drying redrying process of four drying zones of claim 2,
4. the mesh belt type direct drying and redrying process of four drying areas according to claim 1, wherein the method for establishing the cooling model of four drying areas comprises the following steps:
s10, selecting N kinds of tobacco leaves with different varieties and different grades as tobacco leaves to be detected, wherein N is a natural number;
s11, using a mesh belt type direct redrying device with four drying areas, and setting an original working temperature T10 of a first drying area, an original working temperature T20 of a second drying area, an original working temperature T30 of a third drying area and an original working temperature T40 of a fourth drying area;
s13, closing the first dampening area and the second dampening area under the condition of ensuring that the moisture removal is unchanged;
s14, sequentially reducing the working temperature of the first drying area by M% at the same interval on the basis of the original working temperature;
similarly, the working temperature of the second drying area is reduced by K% in sequence at the same interval on the basis of the original working temperature;
reducing the working temperature of the drying three zones by P% in sequence at the same intervals on the basis of the original working temperature;
reducing the working temperature of the four drying areas to H% at the same interval on the basis of the original working temperature, and redrying;
wherein M, P, K and H are both natural numbers;
s15, counting and listing moisture results of the redried finished tobacco strips, and obtaining working temperature intervals of drying areas with qualified moisture of the redried finished tobacco strips;
s16, selecting any tobacco leaf to be detected, respectively carrying out redrying test at extreme temperature according to the working temperature interval in the step S15, and obtaining whether the moisture of the finished tobacco sheet is qualified after the redrying at the extreme temperature, wherein if the moisture of the finished tobacco sheet is qualified, the working temperature interval of each drying area is the control parameter of the mesh belt type direct redrying equipment of the four drying areas; if not, step S14 is repeated.
5. The mesh belt type direct drying and redrying process of four drying areas according to claim 4, characterized in that the working temperature intervals of the first drying area, the third drying area and the fourth drying area are all 88% -92% of the original working temperature; the working temperature interval of the second drying area is 79-86% of the original working temperature.
6. The mesh belt type direct drying and redrying process of claim 4, wherein the extreme temperature test comprises at least two tests, one is to select the highest working temperature of the first drying zone, the third drying zone and the fourth drying zone, and the lowest working temperature of the second drying zone; the other is that the lowest working temperature of the first drying area, the third drying area and the fourth drying area and the high and low working temperatures of the second drying area are respectively selected; and respectively carrying out a redrying test.
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