Control device and method for stabilizing relative humidity of hot air of cut tobacco dryer

Abstract

The invention provides a control device and method for stabilizing relative humidity of hot air of a cut tobacco dryer. Before fresh air enters a process hot air heat exchanger, a hot air relative humidity control system is added to control the relative humidity of the hot air to achieve closed-loop control; the hot air relative humidity control system includes an atomizing humidifying device anda hot air humidity detecting device; one or more sets of negative pressure ejection atomizing nozzles are disposed inside the atomizing humidifying device; the humidity detecting device is installed at a hot air temperature inlet pipe of the cut tobacco dryer; and a humidification control unit PLC collects signals of a humidity sensor and hot air volume, and controls a starting set number of the atomizing nozzles to achieve the purpose of stabilizing the relative humidity of an inlet of a cylinder. By utilization of the device, the humidity of the hot air in a cut tobacco drum drying process can be prevented from being affected by a change of temperature and humidity of an external environment, thereby stabilizing process parameters of drum drying, and the stability of the sensory qualityof dried cut tobacco is ensured.

Description

technical field [0001] The invention belongs to the field of tobacco equipment control, and in particular relates to a tobacco equipment processing control device and method, in particular to a control device and method for controlling the relative humidity of hot air of a shred dryer in the tobacco drying link during tobacco processing. Background technique [0002] Cut tobacco drying process is one of the key processes in the production process of cigarette shreds. In this process, drying and dehumidification are achieved through heat conduction between the shredded tobacco and the drying cylinder and convective heat exchange between the shredded tobacco and the hot air in the drying cylinder, so that the shredded tobacco is fully loosened, a certain curl is produced, and the filling value of the shredded tobacco is increased. [0003] Chinese patent CN103371428A discloses a control method for stabilizing the humidity of hot air for drying shredded tobacco, including fresh...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN103371428A discloses a control method for stabilizing the humidity of hot air for drying shredded tobacco, including fresh air temperature and humidity detection, hot air volume control system, humidifying steam control system, and hot air temperature control system. The change of hot air humidity caused by the change of environmental temperature and humidity can stabilize other parameters of the shredded tobacco machine in the production process and improve the quality stability of finished tobacco shreds. However, the device involved in this method is only equipped with a fresh air humidity detector. There is no hot air humidity detector for the drying silk inlet process, and no closed-loop control is formed for the hot air humidity control, and the control stability is not good

At the same time, for the hot air temperature control system, although applying steam can increase the humidity, it also causes temperature fluctuations, which in turn leads to poor stability of the hot air temperature control system

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