SU1147336A1 - Method of drying tobacco in compact mass - Google Patents

Abstract

METHOD OF DRYING TOBACCO IN DENSE, including phases of languor, color fixation and drying with a decrease in the relative humidity of the drying agent during the drying process, characterized in that, in order to speed up the drying process and improve the quality of dried tobacco, the relative humidity of the drying agent is reduced during phases of languor and fixing the color at constant temperature and pressure, followed by restoring the humidity to its original value so that during the languid phase the humidity after reduction is 45-50%, while reducing and The restoration is carried out at the final stage for 3 hours, and during the color fixation phase, the decrease and restoration of moisture are carried out twice during the final 3 h phase as the surface moisture accumulates on the tobacco leaves, and each time the humidity is reduced by 28-35 ° ; / o from its S initial value. cl

Description

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70 80 90 WO 110 to 130 Vrep (Part 7) The invention relates to the post-harvest processing of tobacco, namely to convective drying of tobacco in a dense mass. A method of convective drying of tobacco in a dense mass is known, in which the drying process is divided into four phases; fixing the color, drying the plate and finishing the midrib, ensuring the maintenance of a certain moisture separation during the entire drying process, as well as a constant exchange mode of the spent medium 1. However, the known method does not allow the intensity to be varied. moisture from tobacco leaves due to the accumulation of excess moisture on their surface, which leads to steaming of tobacco and, as a result, to a decrease in the quality of dried tobacco. There is a known method of drying tobacco in a dense mass, which includes phases of languor, color fixation of drying and drying with a decrease in relative humidity the drying agent in the drying process 2. However, the known method does not allow intensive removal of moisture from tobacco leaves during languor and color fixation phases. The purpose of the invention is to accelerate the drying process and improve the quality of dried tobacco. The goal is achieved by the fact that according to the method of drying tobacco in a dense mass, which includes phases of languor, color fixation of drying and drying with a decrease in the relative humidity of the drying agent during the day, the relative humidity of the drying agent is reduced during phases of languor and color fixation at constant and pressure, followed by recovery of moisture to its original value, so that during the languor phase, the humidity after the decrease is 45-50%, while the decrease and recovery is carried out at the final for 3 hours, and during the color fixation phase, the decrease and restoration of moisture are carried out twice during the final 3 hours of the phase as the surface moisture accumulates on the tobacco leaves, each time the humidity is reduced by 28-35% of its original value. The technological process of convective drying of tobacco in a dense mass is carried out as follows. Cartridges with tobacco leaves are loaded into the drying chamber, heating and ventilation devices are included, as well as a drying control panel. The drying agent parameters are carried out to the required values: air temperature 34-35 ° C and relative humidity 86-93%. After the drying agent reaches the indicated parameter values, the languor phase of the tobacco begins. This 6-2 phase of drying is characterized by the fact that for 6-10 hours the air temperature in the chamber is maintained at 34-35 ° C and relative humidity is 86-93%. Then within 4-6 hours, the temperature rises to 37-39 ° C and the relative humidity decreases to 76-87%. These parameters of the drying agent are maintained until the end of the languor phase, and at the end of this phase a 3 h reduction in the relative air humidity to 45-50% is performed, followed by its restoration to the previous value. The decrease in the relative humidity of the air ensures the intensive removal of the excess moisture accumulated on the sheet surface. The relative humidity of the air in the primary chamber is restored to its previous value due to intensive moisture separation from the inner layers of the tobacco. After the end of the languor phase, a fixation phase begins, characterized in that the temperature of the drying agent rises to 40-42 ° C for 3-4 hours and the relative humidity drops to 67-77 / 0 and these parameters are further maintained until the end of the phase. In the fixation phase, after 4-5 hours from the beginning of the phase, a 3 h reduction from | relative humidity up to 43% followed by restoration to its previous value and repeat this process 5-7 hours after the first decrease in humidity. After fixing is completed, the drying phase of the plate begins. In this phase, the temperature of the essential agent is raised to 8–50 ° C for 8 hours, the relative humidity is lowered to 46–52% and 6–8 hours these parameters of the medium are kept constant. The middle vein drying phase begins with a temperature rise in the chamber up to 75-77 ° C for 16-34 hours and is maintained at this level for 24-25 hours. The relative humidity of the air at the drying stage is reduced in steps to 26-36% for 6-20 hours and up to 14-16% within 35-38 h. The proposed method was used for drying Tobacco Virginia in the state of technical maturity, Jubilee 8 in the state of full technical maturity and technical maturity. Graphs of changes in temperature and relative humidity of the drying agent for these tobaccos are shown in FIG. 1-3. Example 1. Tobacco Virginia in a state of technical maturity (Fig. 1). During the 10-hour phase, the temperature of the essential agent is 35 ° C and the relative humidity is 86%, then the temperature is raised to 4 ° C for 4 hours

and a decrease in relative humidity to 81%. For 21 hours from the beginning of the phase, the relative air humidity in the drying chamber is reduced to 49% for 3 hours, followed by its restoration to the previous value of 81%. The fixation phase of the color of the tobacco leaves begins by raising the temperature in the chamber to 41 ° C in 4 hours and this temperature is maintained until the fixation phase is shaken. The relative humidity of the air in the chamber at this phase is reduced to 72%. At 31 and 41 hours from the beginning of the drying process,

3h decrease in relative humidity of air in the chamber to. 43% with the subsequent restoration to the previous value. During the drying phase of the plate, it is necessary to raise the temperature in the chamber to 50 ° C in 8 hours and reduce the relative humidity of the air to 4 ° C. These medium parameters are maintained 8 hours before the end of the drying phase. The final phase of the drying of tobacco is the drying of the midrib. In this phase, the temperature is raised to 77 ° C for 16 hours and maintained until the end of the phase. The relative humidity of the air in the chamber changes in steps: in the first 6 hours from the beginning of the phase it decreases to 36% and further to 14%.

Example 2. Jubilee-8 tobacco in the state of full technical maturity (Fig. 2). During the hardening phase, the air temperature is maintained at 34 ° C for 6 hours and the relative humidity is 93%, after which

4 hours, the temperature rises to 38 ° C and the relative humidity decreases to 81%. At 17 hours from the beginning of the languor phase, a 3 h decrease in the relative air humidity to 49% and its further restoration to the previous value of 81% is carried out. During the fixing phase, the temperature of the drying agent is raised to 41 ° C for 3 hours and the relative humidity is reduced to 72%. At 26 and 35 hours from the start of drying, 3 hours of decrease in the relative humidity of the air in the drying chamber to 43% are carried out, after which it is restored to its previous value. In phase

Drying is carried out for 8 hours; the temperature rises to 48 ° C and the relative humidity decreases to 52%. These medium parameters are maintained for 6 hours. At the end of 34 hours, the temperature is raised to 77 ° C and maintained at this level until the end of the phase. In the first 20 hours from the beginning of the phase, the relative humidity of the air is reduced to 26% and further to 14%.

Example 3. Tobacco Jubilee-8 is in the state of technical maturity (Fig. 3). For 10 hours in the languor phase, the temperature of the drying agent is 34 ° C and the relative humidity of 93%, then the temperature is raised to 38 ° C and the relative humidity is reduced for 4 hours; humidity up to 81%. At 21 hours from the beginning of the languor phase, a 3 h decrease in the relative humidity of the air in the chamber to 49% followed by its restoration to 81% and maintaining at this level until the end of the languor phase. In phase

0 fixations raise the temperature of the agent to 41 ° C in 3 hours and reduce the relative humidity to 72%. Starting from 32 and 41 hours from the start of drying, 3 hours of a decrease in the relative humidity to 43% were carried out, after which

5 restore to 72%. During the drying phase, the plates raise the temperature to 48 ° C in 8 hours and reduce the relative humidity to 52%, maintaining these parameters until the end of the drying phase. The final phase of the technological process of drying tobacco

0 is characterized by the fact that during 34 hours the temperature of the drying agent is raised to 77 ° C and maintained at this level until the end of drying, while the relative humidity decreases in the first 20 hours to

 27% and further to 14%.

A short-term decrease in the relative humidity of the drying agent removes excess moisture accumulating on the sheet surface, increases the intensity of its removal, which leads to a reduction in these phases, and consequently, the entire drying process and an increase in the quality of dried tobacco.

W 20 30 iO 50 60 70 80 90 WO 110 720 W FIG. 2Brep (1)

Claims (1)

METHOD FOR DRYING TOBACCO IN DENSE MASS, including the phases of languishing, color fixing and drying with a decrease in the relative humidity of the drying agent during the drying process, characterized in that, in order to accelerate the drying process and improve the quality of dried tobacco, the relative humidity of the drying agent is reduced in phases languishing and fixing color at constant temperature and pressure, followed by restoration of moisture to its original value so that in the languishing phase the humidity after reduction is 45-50%, while the reduction and recovery renewal is carried out at the final stage for 3 hours, and at the color fixing phase, the reduction and restoration of humidity is carried out twice during the final 3 hours of the phase as surface moisture accumulates on the tobacco leaves, and each time the humidity is reduced by 28–35% of its initial value . >