A method for improving the uniformity of redrying moisture

Abstract

The present application relates to a method for improving the uniformity of moisture content in the re-drying process, determining the moisture content range of the leaves after re-drying; determining the moisture content change value of the leaves under the condition of the re-drying process of the leaves with the set parameters; detecting the real-time moisture content of the leaves at the outlet of the wind separation storage cabinet in the leaf beating and wind separation stem removal process, and determining whether to add water through the pre-roasting water adjustment process. The technical scheme adds the pre-roasting water adjustment process between the leaf beating and wind separation stem removal process and the re-drying process of the leaves, and controls according to the real-time moisture content of the leaves at the outlet of the wind separation storage cabinet, so as to ensure the relatively stable moisture content of the leaves entering the re-drying process, thereby improving the uniformity of moisture content in the re-drying process.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tobacco processing, and particularly relates to a method for improving the uniformity of re-drying moisture. BACKGROUND

[0002] The existing threshing and redrying process is that the tobacco leaves are subjected to leaf laying, primary hot air leaf moistening, secondary hot air leaf moistening, threshing and wind separation for stalk removal, leaf redrying, and finished product packaging. After the secondary leaf moistening, the moisture and temperature of the tobacco leaves are basically uniform, and the leaves enter the threshing and wind separation process for leaf and stalk separation. The equipment process is relatively long at this stage, and the leaf moistening and temperature are greatly affected by the wind separation. After the tobacco leaves are subjected to the threshing and wind separation under different environmental temperature and humidity, the moisture of the tobacco leaves is greatly different. Then, the tobacco leaves directly enter the redrying process, resulting in great fluctuation of the moisture of the incoming leaves in the redrying process and great influence of the environmental temperature and humidity. Because there is no moisture adjusting process between the secondary hot air leaf moistening and the leaf redrying, the leaves are temporarily stored and subjected to the threshing and wind separation, resulting in great fluctuation of the moisture of the incoming leaves in the redrying process and uncontrollability. SUMMARY

[0003] The application aims to provide a method for improving the uniformity of re-drying moisture, so as to solve the problem of great fluctuation of the moisture of the incoming leaves in the redrying process and uncontrollability due to the fact that there is no moisture adjusting process between the secondary hot air leaf moistening and the leaf redrying.

[0004] To achieve the above-mentioned purpose, the application is implemented by the following technical scheme:

[0005] A method for improving the uniformity of re-drying moisture, comprising the following steps:

[0006] S1, determining the moisture content range A of the leaves after leaf redrying, wherein the median value of the moisture content range is A0;

[0007] S2, determining the moisture content change value Delta of the leaf redrying process under the condition of a set parameter;

[0008] S3, detecting the real-time moisture content P of the leaves at the leaf outlet of the wind separation storage cabinet in the threshing and wind separation stalk removal process, and determining: if the value H of (P-Delta) is within the range A, the pre-drying moisture adjusting process supplements water into the leaves or does not supplement water; if the value H of (P-Delta) is less than the minimum value of A, step S4 is entered; if the value H of (P-Delta) is greater than the maximum value of A, step S5 is entered;

[0009] S4, the pre-drying moisture adjusting process supplements a set amount of water into the leaves, and the leaves after the water supplementing enter the moisture stabilizing storage cabinet for a set time and then enter the leaf redrying process;

[0010] S5, the leaves at the leaf outlet of the wind separation storage cabinet do not enter the pre-drying moisture adjusting process, but enter the high-moisture leaf storage cabinet.

[0011] Further, in step S3, if the value H of (P - Δ) is within the range of A and H is between A0 and the maximum value of A, the leaves coming out of the leaf outlet of the air separation storage cabinet directly enter the leaf redrying process, and the amount of leaves entering the leaf redrying process is controlled to decrease.

[0012] Further, in step S3, if the value H of (P - Δ) is within the range of A and H is between A0 and the minimum value of A, the water addition process before baking replenishes water to the leaves, and the moisture content of the leaves after water replenishment is close to A0.

[0013] Further, the water addition process before baking includes a drum - type water replenishment device and a moisture balance storage cabinet.

[0014] Further, the water addition process before baking replenishes water to the leaves in the form of steam or steam - water mixture.

[0015] Further, the leaves after water replenishment are subjected to moisture balance in the moisture balance cabinet for 1 - 2 hours.

[0016] Further, before step S4, it also includes that if the value H of (P - Δ) < the minimum value of A, this part of the leaves enters the high - moisture - content leaf storage cabinet, is mixed with the high - moisture - content leaves, and after balancing for a set time, steps S3 to S5 are carried out.

[0017] The beneficial effects of the present invention are as follows:

[0018] By adding a water addition process before baking between the leaf threshing and air separation and stem - removing process and the leaf redrying process, and performing corresponding control according to the detected instant moisture content of the leaves at the leaf outlet of the air separation storage cabinet, the moisture content of the leaves entering the leaf redrying process is ensured to be relatively stable, thereby improving the uniformity of redrying moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flow block diagram of the method for improving the uniformity of redrying moisture of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, rather than being construed as a limitation to the technical solution of the present invention.

[0021] As Figure 1 shown, the process of leaf threshing and redrying of the present application is an improvement based on the existing leaf threshing and redrying process. Therefore, the processes of leaf - laying and bunch - arranging, primary hot - air leaf moistening, secondary hot - air leaf moistening, leaf threshing and air separation and stem - removing, and finished - product packing included in the present technical solution are all prior arts. The present technical solution does not involve improvements to the above processes. Therefore, the applicant will not describe these processes in detail.

[0022] The technical scheme focuses on that the tobacco leaves after stalk separation by leaf beating are stored in the wind separation storage cabinet for a short time to ensure the stable flow of the leaves in the subsequent leaf redrying process. Because the moisture content in the leaves inevitably changes due to the change of the working environment and the like during the process of stalk separation by leaf beating and storage in the wind separation storage cabinet, the moisture content of the leaves supplied to the leaf redrying process is not balanced. However, the adjustment of the working parameters of the leaf redrying equipment is relatively complex, and basically all enterprises do not adjust the process parameters of the leaf redrying equipment, which inevitably leads to unstable moisture content of the redried leaves. The existing technology can only balance the moisture during the storage of the finished product, but this leads to a large difference in the moisture content of the leaves.

[0023] Therefore, the technical scheme adds a moisture adjustment process before leaf curing after the wind separation storage cabinet. The main equipment of the process is a drum-type leaf moistening device and a moisture balance storage cabinet. The above-mentioned equipment are conventional equipment, and a person skilled in the art can adjust them as needed, such as replacing the drum-type leaf moistening device.

[0024] After the addition of the leaf moistening process before leaf curing, if all the leaves enter this equipment, the production cost is undoubtedly increased. Therefore, the technical scheme is realized by the following method:

[0025] The application provides a method for improving the uniformity of redrying moisture, comprising the following steps:

[0026] S1, determining the range A of the moisture content of the leaves after leaf redrying, and the median value of the range of the moisture content of the leaves is A0; this is an example, but it is not said that the technical scheme can only be applied to this data. If the moisture content of the leaves after leaf redrying is determined to be 14%-15% as a qualified range, it is convenient for the subsequent finished product packaging and leaf aging, that is, the value of the range A of the moisture content of the leaves of the technical scheme is between 14%-15%, and the median value A0 of the range is 14.5%. Of course, if the moisture content of the leaves after redrying is about 14.5%, it is the best effect.

[0027] S2, determining the change value Δ of the moisture content of the leaves under the condition of the leaf redrying process with the set parameters. The set parameters such as the set redrying temperature and the set ventilation amount are fixedly set. The leaves coming out of the wind separation storage cabinet have a fixed change value Δ of the moisture content after passing through the leaf redrying equipment. This is an example of taking Δ as 1% and reducing the moisture content by 1%. For example, the moisture content of the leaves entering the leaf redrying equipment is 15%, and the moisture content of the leaves coming out of the leaf redrying equipment is 14%.

[0028] S3, detecting the instant moisture content P of the tobacco leaves at the outlet of the wind separation storage cabinet in the leaf wind separation and stem removal process, and determining: if the value H of (P-Δ) is within the range of A, for example, 14%-15% as described above, the value H is within the range, then the pre-curing water adjustment process adds water to the tobacco leaves or does not add water (see the following description for details); if the value H of (P-Δ) is less than the minimum value of A, for example, less than 14%, then step S4 is entered; if the value H of (P-Δ) is greater than the maximum value of A, i.e., greater than 15%, then step S5 is entered; this part describes the instant moisture content of the tobacco leaves entering the tobacco leaf redrying equipment, if the instant moisture content of the tobacco leaves is low, then the moisture content of the tobacco leaves after passing through the redrying equipment is also low, and if the instant moisture content of the tobacco leaves is high, then the moisture content of the tobacco leaves after passing through the redrying equipment is also high.

[0029] S4, the pre-curing water adjustment process adds a set amount of water to the tobacco leaves, and the tobacco leaves after the water addition are stored in the moisture stabilization storage cabinet for a set time before entering the tobacco leaf redrying process; the specific amount of water added is calculated according to the difference between the instant moisture content of the tobacco leaves in the wind separation storage cabinet and the pre-curing moisture content corresponding to the suitable moisture content of the tobacco leaves after redrying, and the conveying amount of the tobacco leaves.

[0030] S5, the tobacco leaves at the outlet of the wind separation storage cabinet do not enter the pre-curing water adjustment process, but enter the high-moisture-content tobacco leaf storage cabinet. This is because the instant moisture content of the tobacco leaves is already high at this time, and the moisture content of the tobacco leaves after redrying is also higher than the specified range, so it is necessary to reduce the moisture content of the tobacco leaves before redrying. The control method for this part can be that if the value H of (P-Δ) is less than the minimum value of A, the tobacco leaves in this part enter the high-moisture-content tobacco leaf storage cabinet, mix with the high-moisture-content tobacco leaves, and balance the moisture content for a set time before entering steps S3 to S5.

[0031] In other embodiments of the present application, in order to relatively stabilize the moisture content of the tobacco leaves after redrying, in step S3, if the value H of (P-Δ) is within the range of A, and H is between A0 and the maximum value of A, i.e., between 14.5% and 15%, the tobacco leaves at the outlet of the wind separation storage cabinet directly enter the tobacco leaf redrying process, and the tobacco leaves in this part do not need to enter the pre-curing water adjustment process. The amount of the tobacco leaves entering the tobacco leaf redrying process is adjusted by control.

[0032] In step S3, if the value H of (P-Δ) is within the range of A, and H is between A0 and the minimum value of A, the pre-curing water adjustment process adds water to the tobacco leaves, and the moisture content of the tobacco leaves after the water addition is close to A0.

[0033] The pre-curing water adjustment process of the present technical solution includes a roller-type water addition device and a moisture stabilization storage cabinet. The pre-curing water adjustment process adds water to the tobacco leaves in the form of steam or steam-water mixture. The tobacco leaves after the water addition are stored in the moisture stabilization storage cabinet for 1-2 hours for moisture balance.

[0034] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A method of improving the uniformity of redrying moisture, characterized by, The method comprises the following steps: S1, determining the range A of the moisture content of the leaves after re-drying, and the median value of the range A is A0; S2, determining the moisture content change value Δ of the leaves under the condition of the re-drying process of the set parameters; S3, detecting the real-time moisture content P of the leaves at the outlet of the wind separation storage cabinet in the leaf beating and stem separating process, and determining: if the value H of (P-Δ) is within the range A, the pre-drying water adjusting process adds water to the leaves or does not add water; if the value H of (P-Δ) is less than the minimum value of A, step S4 is entered; if the value H of (P-Δ) is greater than the maximum value of A, step S5 is entered; S4, the pre-drying water adjusting process adds a set amount of water to the leaves, and the leaves after the water adding are stored in the water balance cabinet for a set time before entering the re-drying process; S5, the leaves at the outlet of the wind separation storage cabinet do not enter the pre-drying water adjusting process, but enter the high-moisture-content leaf storage cabinet; Before step S4, if the value H of (P-Δ) is less than the minimum value of A, the part of the leaves enters the high-moisture-content leaf storage cabinet, mixes with the high-moisture-content leaves, and balances for a set time before steps S3 to S5 are performed.

2. The method of improving uniformity of redrying moisture according to claim 1, characterized by, In step S3, if the value H of (P-Δ) is within the range A, and H is between A0 and the maximum value of A, the leaves at the outlet of the wind separation storage cabinet directly enter the re-drying process, and the amount of the leaves entering the re-drying process is controlled to be reduced.

3. The method of improving uniformity of redrying moisture according to claim 1, characterized by, In step S3, if the value H of (P-Δ) is within the range A, and H is between A0 and the minimum value of A, the pre-drying water adjusting process adds water to the leaves, and the moisture content of the leaves after the water adding is close to A0.

4. The method of improving uniformity of redrying moisture according to claim 1, characterized by, The pre-drying water adjusting process comprises a roller type water adding device and a water balance cabinet.

5. The method of improving uniformity of redrying moisture according to claim 4, characterized by, The pre-drying water adjusting process adds water to the leaves in the form of steam or steam-water mixture.

6. The method of improving uniformity of redrying moisture according to claim 4, wherein The leaves after the water adding are balanced in the water balance cabinet for 1-2 hours.

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