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Temperature and humidity control method and temperature and humidity control system for dampening region of tobacco redrying machine

A technology of temperature and humidity control and humidity control, which is applied in the fields of tobacco, tobacco preparation, application, etc., can solve the problems of large fluctuations in the quality of tobacco leaves and mutual interference of multiple parameters, and achieve a small range of moisture fluctuations, a small control range, and facilitate the quality of finished tobacco leaves. Effect

Active Publication Date: 2018-08-10
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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  • Temperature and humidity control method and temperature and humidity control system for dampening region of tobacco redrying machine

Examples

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 includes 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 c...

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 of 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 int...

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 of 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....

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Abstract

The invention discloses a temperature and humidity control method and a temperature and humidity control system for a dampening region of a tobacco redrying machine, and relates to the technical fieldof tobacco redrying. The temperature and humidity control method includes dividing the dampening region into three regions from a feed inlet to a discharge outlet; acquiring deviations and deviationchange rates; acquiring limit values of the deviation change rates, performing regional control according to an obscure PID control method, and acquiring three control ranges according to the limit values of the deviation change rates; acquiring real-time deviation change rates ec, and adjusting temperature and humidity of each region according to a regional intelligent PID control algorithm; controlling the steam quantity for jetting to adjust the temperature through control of the aperture of a pneumatic membrane valve; controlling the atomized water quantity for jetting to adjust the humidifying quantity through control of on-off of an atomization water circuit electromagnetic valve. The temperature and humidity control method and the temperature and humidity control system have the advantages that control accuracy is achieved through regional control, each target parameter can be adjusted according to moisture contents and temperatures of discharged tobacco leaves, and accordingly,the tobacco leaves with stable quality are acquired.

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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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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