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Method for stably controlling product moisture content for pneumatic drying system

A technology of airflow drying and stable control, applied in the direction of drying solid materials, drying, lighting and heating equipment, etc., can solve the problems of easy agglomeration of products, difficult to store, affecting the yield and efficiency of factories, etc.

Active Publication Date: 2019-10-22
内蒙古中凯自动化技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The moisture content of the product is unstable, which brings many problems to the enterprise; the moisture content of the product is high, exceeding the moisture content standard, on the one hand, it will cause the drying tower to be blocked, and on the other hand, the product is easy to agglomerate and difficult to store, which cannot meet customer requirements. Even fined by relevant departments, affecting the brand image
The low moisture content of the product not only affects the gloss of the product, but also seriously affects the yield and profit of the factory. Take a potato starch factory with an annual production of 10,000 tons as an example: a conservative estimate, the product moisture is 1 percentage point lower, and the market price is 6,500 yuan / ton , the factory’s annual direct loss is 650,000 yuan

Method used

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  • Method for stably controlling product moisture content for pneumatic drying system
  • Method for stably controlling product moisture content for pneumatic drying system
  • Method for stably controlling product moisture content for pneumatic drying system

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Experimental program
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Effect test

Embodiment 1

[0049] Such as figure 1 , figure 2 A kind of airflow drying system shown, it comprises emulsion tank 1, water tank 2, vacuum dehydrator 3, air-water separation tank 4, feeding unit 5, airflow drying tower 6, steam source 7, fresh air source 8, heat exchange Device 9, cyclone collector 10, exhaust fan 11, PLC controller 12, dehydrator storage tank level gauge 13 arranged in vacuum dehydrator 3, steam pipe arranged at the steam inlet of heat exchanger 9 Pressure sensor 14, the airflow drying tower intake air temperature sensor 27 that is located on the airflow drying tower 6 air intake ducts, the micro-negative pressure sensor 15 that is located in the airflow drying tower 6 and the exhaust air that is located on the airflow drying tower 6 outlet pipelines temperature sensor 16;

[0050] The outlet of the emulsion tank 1 is connected with the emulsion inlet of the vacuum dehydrator 3, and the pipeline connecting the emulsion tank 1 and the vacuum dehydrator 3 is provided with...

Embodiment 2

[0059] Such as image 3As shown, the method for stably controlling the product moisture content of the airflow drying system of Embodiment 1 includes a PLC controller 12, a detection device and an actuator, the signal output end of the detection device is connected with the signal input end of the PLC controller 12, and the PLC The signal output end of the controller 12 is connected with the signal input end of the actuator; wherein, the detection device includes a dehydrator storage tank liquid level gauge 13, an airflow drying tower inlet air temperature sensor 27, a steam pipeline pressure sensor 14, and a micro-negative pressure sensor 15. The pressure sensor 23 and the exhaust air temperature sensor 16 in the cooling tower; the actuator includes: the water inlet regulating valve 18, the steam regulating valve 19, the exhaust fan 11, the cooling fan 24, the drum motor 25 and the feed regulating valve 20.

[0060] The PLC controller 12 is a whole set of core control modules...

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Abstract

The invention discloses a method for stably controlling product moisture content for a pneumatic drying system. According to the method, by means of a dehydrator liquid level PID control module, a pneumatic drying tower intake air temperature control module, a pneumatic drying tower internal negative pressure PID control module and a cooling tower internal negative pressure PID control module, independent and stable control over the liquid level of a dehydrator, the intake air temperature of the pneumatic drying tower, the negative pressure in the pneumatic drying tower and the negative pressure in the cooling tower, then a pneumatic drying tower exhaust air temperature PID control module establishes PID control correlation between the feeding amount and the exhaust air temperature of thepneumatic drying tower, the method achieves the effect of stably and accurately controlling the exhaust air temperature of the pneumatic drying tower, and then stable control over the product moisturecontent is achieved.

Description

Technical field: [0001] The invention relates to a method for controlling the moisture content of a product, in particular to a method for stably controlling the moisture content of a product used in an airflow drying system. Background technique: [0002] Airflow drying is mostly used for drying various starches such as potato, cassava, corn and other drying processes from emulsion to powder. At present, there has been no good method for air drying moisture control, mainly relying on manual control, and some factories adopt a single automatic control method, which has not achieved the ideal control effect. Although there are national standards for moisture content standards, the moisture content of products in each factory fluctuates and is not stable. The stability of the moisture content of the product depends on the stability of the exhaust air temperature of the entire drying system. The control core point of the entire set of air drying moisture control system lies in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B25/22
CPCF26B25/22
Inventor 师帅安春明师学良刘燕李耀龙曹肖东安晓军
Owner 内蒙古中凯自动化技术有限公司
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