A Method for Preventing Tobacco Leaves from Mildew and Rotting in the Baking Process of Up-draft Intensive Curing Barn

Abstract

The invention provides a method for preventing tobacco leaves from mildewing and rotting in the baking process of an airflow rising type bulk curing barn. An airflow in the bulk curing barn can be under the conditions of oscillatory internal cycle, oscillatory motion and staged one-way slow moisture discharging by utilizing a fan air direction change control system to change the airflow direction in the barn after 12 hours in a yellowing period, and normal airflow motion direction is recovered within about 48 hours. In an oscillatory period, one-time change of the airflow motion in the barn every 10 minutes is set, oscillatory internal cycle is performed for 2 hours, then oscillatory motion and staged one-way slow moisture discharging (effective discharging time is 0.5 hour) are performed for 1 hour, a heating and moisture discharging stage is executed, and the airflow in the barn is changed into a normally rising airflow. The other baking technologies of the method are same as conventional baking. The method makes the temperature and humidity of the tobacco leaves in the barn uniform, the large difference of a high-temperature zone and a low-temperature zone is relieved, formation of condensed water at the top of the barn is reduced, and accordingly the temperature and humidity difference and tobacco leaf mildewing and rotting caused by condensed water in the baking process are decreased.

Description

technical field [0001] The invention relates to the technical field of flue-cured tobacco preparation, in particular to a method for preventing tobacco leaves from mildew and rot during the baking process in an ascending-airflow intensive curing barn. Background technique [0002] According to the survey results, if the symptoms of rot and mildew occur during the curing of tobacco leaves, the loss of curing will increase by 2.3-3.7% (the weight loss of tobacco leaves is 0.76-0.92%, and the loss of tobacco leaf grades is 1.54-2.78%). The loss is at least 103.5 yuan, and the mildew and rot also cause the loss of the aroma of the tobacco leaves. The time period for tobacco leaves to rot during the curing process is between 13 and 48 hours. After 48 hours, it enters the heating and dehumidification stage, and the rate of mildew and rot decreases significantly. The main reasons for the mildew and rot of tobacco leaves during the curing process include temperature and humidity dif...

AI Technical Summary

Problems solved by technology

[0003] Chinese invention patent CN103404962A discloses a method for preventing tobacco leaves from rotting during the curing process of tobacco leaves, emphasizing the use of drugs to treat infected bright leaves and appropriately reducing the humidity in the curing room, but does not propose how to solve the problem of large humidity in the curing room Temperature difference, and no specific operation method is proposed to reduce the humidity in the barn; Chinese invention patent CN202653141U discloses a wind direction variable control system for flue-cured tobacco barns, which emphasizes adjusting the wind direction of the fan between the yellowing period, the color fixing period and the tendon drying period , to further reduce the humidity of the barn, but the occurrence of mildew and rot mainly occurs in the yellowing stage, that is, between 12 and 48 hours, and the patent proposes that in the same period, the wind direction remains unchanged, and only the airflow descending type is used during the yellowing stage to fix the color During the drying period, only the airflow ascending type is performed, and the airflow descending type is only used during the drying period, which cannot alleviate the large temperature difference between the high temperature zone and the low temperature zone, and does not propose a specific operation to reduce the humidity in the barn; Chinese invention patent CN102068028A discloses an alternate airflow operation The traditional flue-cured tobacco-intensive curing process emphasizes different stages and changes the airflow direction at different intervals to reduce the plane and vertical temperature differences in the curing room, so that the moisture loss of the tobacco leaves in the curing room is relatively uniform, but the process is the lowest. The interval time is 0.5h. Once the airflow changes from reverse to forward, the temperature in the high-temperature area of ​​the barn rises sharply, and the process also adopts the alternate airflow operation in the stage of color fixation and rib drying. No solution is proposed to solve the problem of reverse airflow. Wet, resulting in insufficient moisture removal

[0004] An existing method for preventing tobacco leaves from mildew and rot during the baking process of the air-flow ascending dense barn can overcome the above shortcomings, mainly: aiming at the occurrence of mildew and rot, the air flow in the barn is in an oscillating movement during the yellowing period to alleviate The temperature difference between the high-temperature zone and the low-temperature zone is large, overcoming the invention patent CN103404962A and the invention patent CN202653141U, and performing airflow oscillation movement and staged one-way slow dehumidification during the yellowing period, which solves the problem of excessive humidity in the barn during the yellowing period and avoids fixed Insufficient dehumidification in the color stage and the dry tendon stage, overcoming the unclear moisture removal measures in the invention patent CN103404962A and the invention patent CN202653141U, overcoming the insufficient dehumidification in the color fixing stage and the dry tendon stage of the invention patent CN202653141U and the invention patent CN102068028A

Images