Low-oxygen drying method and device for pneumatic drying of tobacco

Abstract

The invention discloses a low-oxygen drying method and device for pneumatic drying of tobacco. According to the low-oxygen drying method and device for the pneumatic drying of the tobacco, a pressure detector and an oxygen content detector are installed on a pneumatic drying device, a damp discharging valve is installed on a damp discharging pipeline, a steam injection device is installed on a pipeline extending into a hot blast stove, an interlocking control relation of the pressure P detected by the pressure detector, the oxygen content O2 detected by the oxygen content detector, the steam injection flow Q and the open degree of the damp discharging valve is established through a control system, and the oxygen content of the system is adjusted by the changing of the steam injection amount or the changing of the pressure value of the system. According to the low-oxygen drying method and device for the pneumatic drying of the tobacco, low-oxygen drying control of a pneumatic drying process of the tobacco can be achieved, the oxygen content of the system is adjusted through two regulating variables, odor of the dried tobacco can be effectively controlled, and safe running of the device is guaranteed. The low-oxygen drying device for the pneumatic drying of the tobacco is simple in structure and reliable in operation.

Description

technical field [0001] The invention relates to a tobacco drying processing method, in particular to a low-oxygen drying method for air-drying tobacco, and also relates to a device for realizing the method. Background technique [0002] Tobacco drying is an indispensable part of tobacco processing, and its treatment effect is crucial to the quality of tobacco smoking, especially the level of oxygen content in the airflow of the tobacco air drying system has a great influence on the energy consumption of equipment operation, fire hazards and the taste of tobacco big. [0003] At present, the common airflow drying equipment either only has the oxygen content control device of the airflow, or only the pressure control device of the system airflow. The oxygen content of the system is complicated and slow to control, so the oxygen content control method is generally not used. Controlling the system pressure can control the amount of cold air entering the system, thereby affectin...

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Problems solved by technology

[0003] At present, the common airflow drying equipment either only has the oxygen content control device of the airflow, or only the pressure control device of the system airflow. The oxygen content of the system is complicated and slow to control, so the oxygen content control method is generally not used.

Controlling the system pressure can control the amount of cold air entering the system, thereby affecting the energy consumption of the system, but if the pressure is too small, it will affect the ability to discharge tobacco materials, and at the same time the oxygen content of the system will increase. The amount will affect the taste of dried tobacco and even cause fire hazards; excessive air pressure of the system will affect the ability of tobacco materials to enter the system. It is difficult to achieve the desired control effect by choosing either of these two control methods

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