Peduncle filum drying column humidity control method

Abstract

The present invention relates to a stem shreds drying tower moisture control method. Said method is characterized by that said method includes the following steps: using an oxygen content detection sensor to detect oxygen content in the stem shreds drying tower equipment, when the oxygen content is greater than or equal to 5% or is less than or equal to 5.6%, the pressure loop set value is retained and not changed, when the actual oxygen content is less than or equal to 5% or greater than or equal to 5.6%, the pressure loop set value can be respectively increased or reduced, and detect pressure of pressure loop and compare said pressure with pressure loop set value; using a PID controller to control moisture discharge valve according to the difference value, always retain that the interior pressure of stem shreds drying tower equipment is followed after the pressure loop set value; and using an outlet moisture instrument to detect moisture of material, when the outlet moisture and outlet moisture set value are not identical, calculating water-adding set value, comparing the water quantity detected by water-adding flow-rat sensor with said water-adding set value, using PID controller to control water-adding regulation valve according to its different value and making outlet moisture always be followed after outlet moisture set value.

Description

Technical field: [0001] The invention relates to a method for controlling the moisture at the outlet of a cut stem drying tower. Background technique: [0002] The cut stem drying tower is used in the tobacco shred process to quickly dry and shape the high-temperature and high-humidity cut stems after rehydration. It is required to obtain the highest possible expansion value of the cut stems under the premise of stable moisture in the output material. [0003] Some outlet moisture in the cut stem drying tower is controlled by controlling the opening of the damp damper. That is, when the outlet moisture is higher than the set value, the damper is opened to reduce the material moisture by increasing the moisture; when the outlet moisture is lower than the set value, the damper is closed to reduce the moisture and increase the moisture content of the material. Ultimately achieve the purpose of moisture control. [0004] But there are following defects in the above method, 1: ...

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Problems solved by technology

[0004] However, there are the following defects in the above method, 1: When the opening of the damp damper changes too much, it is easy to oscillate the moisture of the outlet material

It is difficult to ensure the stability of outlet moisture

[0005] 2: If the opening of the moisture exhaust damper changes sharply, it will easily cause the instability of the conveying air pressure in the cut stem drying tower equipment, and it will easily cause the cut stem dry tower equipment to block materials

[0006] 3: Since the hot air temperature at the outlet of the cut stem drying tower combustion furnace reaches more than 240 degrees Celsius, and the cut stems are flammable, if the opening of the damp damper changes sharply, it is easy to cause changes in the oxygen content in the cut stem drying tower equipment. Unstable, easy to cause fire hazards in the cut stem drying tower equipment

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