Process gas temperature control method for loose resurgence roller

A temperature control method and a technology of loosening and regaining moisture, which is applied in the field of temperature control of loosening and dampening drum process gas and tobacco shred production process control. It can solve the problems of unsolved water addition and steam valve opening control hysteresis, and achieve stable loosening and regaining moisture. Process, easy design and implementation, high precision effect

Inactive Publication Date: 2018-09-18
CHINA TOBACCO JIANGSU INDAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above control methods and devices have not solved the effect of water addition on process gas temperature, and there is still hysteresis in steam valve opening control

Method used

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  • Process gas temperature control method for loose resurgence roller
  • Process gas temperature control method for loose resurgence roller
  • Process gas temperature control method for loose resurgence roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, the process requirements for the loosening and moisture regaining process of brand a product are: the temperature of the process gas is 70°C, and according to the equipment situation and process requirements, the T value of the collection period of water addition is set to 15 seconds, k 1 The value is 0.1.

[0026] set y 水 The range of upper and lower limits of compensation is -0.05~0.05, y 1 The range of y is 0~1, the range of y is 0~1, and the corresponding steam valve opening range is 0~100%.

[0027] The average water addition amount of the last batch of grade a calculated by this method is 200L / h, which is used as the standard value d of the water addition amount of the current batch.

[0028] The concrete steps of embodiment are as follows:

[0029] A: Set the formula parameters, that is, according to the requirements of the process standard, set the process gas temperature SP of the drum to 70°C, the standard value d of water addition to 200L / ...

Embodiment 2

[0036] When the next batch of grade a is produced, the standard value of water addition d is 204L / h.

[0037] When the real-time value of process gas temperature PV=72°C, the PID controller will output y in real time 1 = 0.62.

[0038] The instantaneous value of water addition d in the current cycle n = 200L / h, the amount of water added in the previous cycle d n-1=210L / h.

[0039] Calculate the current steam positioning valve opening y for compensation 水 =k*(d n -d n-1 ) / d=0.1*(200-210) / 204=-0.0049, which is the y used for compensation 水 =-0.0049, calculate the current steam valve opening setting value y=0.6151, output to the steam valve positioner, and the corresponding steam valve opening is 61.51%.

[0040] When entering the next cycle, when the real-time value of process gas temperature PV=71°C, the PID controller will output y in real time 1 = 0.615.

[0041] The instantaneous value of water addition d in the current cycle n =206L / h, the amount of water added in...

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Abstract

A process gas temperature control method for a loose resurgence roller comprises the following steps of firstly setting a process gas temperature value SP, a water adding amount standard value d and awater adding amount acquisition period T of a roller, then detecting the process gas real-time temperature PV and instantaneous water adding amount dn of the roller; performing real-time comparison on PV and SP, and performing real-time output of steam positioning valve aperture y1 through operation of a temperature PID controller; according to a preset water adding amount acquisition period T, calculating a difference between the instantaneous water adding amount dn and a water adding amount dn-1 of a previous period, and performing real-time output of a steam positioning valve aperture ywater for compensating through operation of a water adding amount compensation module; and finally calculating a steam valve aperture setting value y and outputting to the steam valve positioning devicefor controlling the injection amount of steam. According to the method, pre-estimation can be performed on water adding amount change of a tobacco block, and aperture of the steam fixing valve can beadjusted in advance, thereby quickly estimating influence of water adding amount to the process gas temperature, and reducing fluctuation amplitude of the process gas temperature.

Description

technical field [0001] The invention belongs to the field of tobacco processing, and in particular relates to a method for controlling the production process of tobacco shreds, in particular to a method for controlling the temperature of the process gas in a loose moisture resurgence drum. Background technique [0002] In the tobacco shred process, loosening and dampening belongs to the first processing procedure. The loosening and dampening drum loosens and increases temperature and humidity of the tobacco block by adding water and steam, and at the same time removes miscellaneous gases from the tobacco leaves. The hot air circulating in the drum is the process gas, and the stability of its temperature control has an important influence on the loosening effect of the cigarette block and the sensory quality of the cigarette. At present, the process gas temperature of the loose moisture resurgence drum adopts PID control mode, and the opening of the output steam valve is adju...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/20
CPCG05D23/20
Inventor 董伟李坤郭昌耀陆磊王峰赵轻岭孟仲王国园王嵩许秋轩
Owner CHINA TOBACCO JIANGSU INDAL
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