A method for controlling moisture content of shredded tobacco in drum dryer based on moisture balance
A control method and shred drying machine technology, applied in tobacco, tobacco preparation, application, etc., can solve problems such as inability to meet higher requirements for process quality, fluctuation of process quality characteristics of cut tobacco, and impact on cigarette quality, so as to avoid quality differences, Guarantee the quality of cigarettes and adjust the effect of fast response
Active Publication Date: 2021-03-19
CHINA TOBACCO HENAN IND
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Problems solved by technology
In order to ensure the moisture content of the exported shredded tobacco, it is sometimes necessary to increase the temperature of the tube wall or the hot air. The change of the temperature of the tube wall or the hot air will cause fluctuations in the quality characteristics of the shredded tobacco, which will have a great impact on the quality of the cigarette. Increasing the temperature of the tube wall or the hot air will also cause The energy consumption is too high, and there is a certain hysteresis in the change of the wall or hot air temperature
Therefore, the control method of dehydration and drying of shredded tobacco only by changing the temperature of the sheet or the temperature of the hot air cannot meet the higher requirements of the process quality.
Method used
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[0032] Such as figure 1 Shown, the present invention comprises the following steps:
[0033] Step A: Obtain the real-time moisture content d of the hot air at the inlet of the silk drying machine respectively 1 D 2 ,
[0034] And obtain real-time cut tobacco mass flow M at the inlet of the shred dryer through measurement 1 , Moisture content on a wet basis of imported shredded tobacco of the shred dryer ω 1 , Moisture content on a wet basis of shredded tobacco at the outlet of the shred dryer ω 2 and workshop air density ρ 1 and air density ρ of tidal wind 2 .
[0035] Step B: Based on the principle of moisture balance, according to the target moisture content of the exported shredded tobacco, use the real-time data obtained in step A
[0036] Moisture content of hot air imported from silk drying machine d 1 , Moisture content of the exhaust air at the outlet of the silk drying machine d 2 , The mass flow rate M of cut tobacco imported from the shred drying machine ...
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The invention discloses a moisture balance-based method for controlling the moisture content of shredded tobacco in a drum-type shred dryer. The method obtains the real-time moisture content of hot air at the inlet of the shred dryer and the moisture content of the exhaust air at the outlet of the shred dryer respectively, and Through measurement, the real-time mass flow rate of shredded tobacco imported from the drying machine, the moisture content on a wet basis of the shredded tobacco imported from the drying machine, the moisture content on a wet basis of the shredded tobacco exported from the drying machine, the air density of the workshop, and the air density of the exhaust air are obtained. Based on the principle of water balance and the acquired data, the theoretical value of the moisture exhaust air volume of the silk dryer is calculated, and the operating frequency of the fan of the silk dryer is adjusted in real time, so that the current moisture exhaust air volume of the silk dryer is consistent with the theoretical value of the moisture exhaust air volume. The invention adjusts the reaction speed faster, effectively improves the response speed of the control system, and avoids quality differences in the same batch of shredded tobacco to a greater extent during processing.
Description
technical field [0001] The invention relates to the technical field of tobacco processing, in particular to a method for controlling the moisture content of shredded tobacco of a drum type shred dryer based on moisture balance. Background technique [0002] Drying cut tobacco is an important process in the production process of cut tobacco. Only by heating and drying cut tobacco to control the moisture content within a certain range can the elasticity and filling capacity of cut tobacco be satisfied. Drum type shred drying machine is a common shred drying equipment in China. It provides drying heat source for shredded tobacco through steam-heated cylinder wall and hot air. Steam, the water vapor emitted by the shredded tobacco is taken out from the tide outlet by the hot air that runs through the entire shredded dryer, thereby completing the dehydration and drying process of the shredded tobacco. [0003] At present, when the drum-type shred dryer is drying shredded tobacco...
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IPC IPC(8): A24B3/04A24B3/10
CPCA24B3/04A24B3/10
Inventor 杨林超党辉张新锋王成硕王玉建崔岩刘磊柳宾
Owner CHINA TOBACCO HENAN IND