Cut Stem drying column humidity control method

Abstract

The moisture control method of the cut stem drying tower uses the oxygen content detection sensor to detect the oxygen content in the cut stem drying tower equipment. When 5%≤oxygen content≤5.6%, keep the set value of the pressure loop unchanged. When the actual When the oxygen content is ≤5% or the actual oxygen content is ≥5.6%, respectively increase or decrease the set value of the pressure loop, detect the pressure of the pressure loop, and compare it with the set value of the pressure loop. Control the damp damper v2, and always keep the internal pressure of the cut stem drying tower following the set value of the pressure circuit; use the outlet moisture meter to detect the moisture of the material, and when the outlet moisture is inconsistent with the outlet moisture set value, calculate the set value of water addition, and add water The water amount detected by the flow sensor is compared with the set value of water addition, and the PID controller controls the water addition regulating valve according to the difference, so that the outlet moisture always follows the 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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