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Method and system for controlling temperature and humidity in moisture regain zone of tobacco sheet redrying machine

A temperature and humidity control and humidity control technology, which is applied in the fields of tobacco, tobacco preparation, and application, can solve the problems of large fluctuation of tobacco leaf quality and mutual interference of multiple parameters, and achieves small moisture fluctuation range, small control range and good control effect. Effect

Active Publication Date: 2021-02-19
HONGTA TOBACCO GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a temperature and humidity control method and control system in the re-moisture zone of a tobacco sheet re-drying machine, to solve the problem of large fluctuations in the quality of tobacco leaves due to mutual interference caused by blind adjustment of multiple parameters

Method used

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  • Method and system for controlling temperature and humidity in moisture regain zone of tobacco sheet redrying machine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for controlling the temperature and humidity in the re-moisture zone of the tobacco sheet re-drying machine is characterized in that the method comprises the following steps:

[0022] a. Divide the resurgence area into three areas from the inlet to the outlet, namely the first area of ​​resurgence, the second area of ​​resurgence and the third area of ​​resurgence, and set the system setting values ​​of each area according to experience;

[0023] b. Obtain the deviation and deviation change rate: the system set value x, the sensor obtains the indoor data collection value y, x and y are sent to the controller PLC, and the deviation e is obtained by comparing the two, and the deviation e is calculated with time as a variable Guide to obtain the deviation change rate ec;

[0024] c. Obtain the limit value of the deviation change rate ec, and adopt fuzzy PID control method partition control: obtain the upper limit value |ec1| of the minimum interval of the error ...

Embodiment 2

[0028] In order to further improve the technical solution in embodiment 1, the system setting value described in this embodiment is the temperature setting value of each district, and the collection value is the temperature collection value of each district; the opening adjustment amount of the pneumatic membrane valve in step d The calculation formula is as follows: ,in: is the proportional gain; is the integral time constant; is the differential time constant; It is the deviation between the collected value and the set value. Resurgence three-zone control corresponds to the (0, |ec1|) range 1 of the ec value. At this time, it is necessary to reduce the overshoot to reduce the system steady-state error, and appropriately introduce differential or integral functions; the resurgence two-zone control corresponds to the ec value. (|ec1|, |ec2|) Range 2, at this time, the system output tends to the desired value, and a smaller proportional coefficient and a larger integr...

Embodiment 3

[0030] In order to further improve the technical solution in embodiment 1, the system setting value described in this embodiment is the moisture content of the tobacco leaf set, and the collection value is the moisture content of the tobacco leaf detected by the moisture meter at the outlet; the nozzle that needs to be opened in step d quantity The calculation formula is as follows: , where: L is the flow rate of the smoke sheet, that is, the weight of the smoke sheet entering the moisture resurgence zone per unit time; is the tobacco leaf moisture content detected by the moisture meter at the entrance; is the tobacco leaf moisture content detected by the moisture meter at the outlet; is the moisture content of tobacco leaves set; is the influence value of steam on the moisture content of tobacco leaves; is the effective utilization rate of atomized water; is the atomization amount of the nozzle, that is, the amount of water sprayed by the nozzle per unit time. A...

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Abstract

The invention discloses a method and system for controlling the temperature and humidity in the re-moisture zone of a tobacco sheet redrying machine, and relates to the technical field of tobacco sheet redrying. The temperature and humidity control method includes the following steps: dividing the moisture regain area into three zones from the direction of the feed inlet to the discharge outlet; obtaining the deviation and the deviation change rate; The change rate limit value is divided into 3 control ranges; the real-time deviation change rate ec is obtained, and the zone intelligent PID control algorithm is used to adjust the temperature and humidity in each zone; The on-off of the solenoid valve of the water circuit controls the amount of sprayed atomized water and adjusts the amount of humidification. Controlling through the zone control mode makes the control more precise, so that each target parameter can be adjusted according to the moisture content and temperature of the exported tobacco leaves, so as to obtain more stable quality tobacco leaves.

Description

technical field [0001] The invention relates to the technical field of redrying of tobacco sheets, in particular to a method and a system for controlling the temperature and humidity in a moisture resurgence zone of a sheet redrying machine. Background technique [0002] Moisture regaining in tobacco rebaking is a very important process. Tobacco leaves absorb moisture in a high-temperature and high-humidity environment to achieve the set moisture content requirement. During the resurgence process, the existing equipment adopts the conventional PID control method to increase the temperature and humidity of the circulating air through the steam sprayed by the steam pipe, and spray water into mist at the bottom of the resurgence area through the water nozzle and the steam-water mixing nozzle to adjust the humidity At the same time, combined with the detection results of the moisture detector and the temperature detector, by adjusting the pressure of the booster pump and the ope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A24B3/10
CPCA24B3/10
Inventor 戴永生曹雷夏飞文伟鲍治华张文东周德荣王子云吴国敏彭朝剑
Owner HONGTA TOBACCO GRP
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