A method and device for monitoring changes in moisture content of materials in a vacuum drying process
A technology of vacuum drying and drying process, which is applied in the direction of measuring devices, drying solid materials, and drying solid materials without heating. It can solve the problems of inconvenient real-time monitoring of moisture, difficult application in industrial production, and inability to achieve continuous measurement. To achieve the effect of practical equipment, low cost and easy operation
Active Publication Date: 2022-02-01
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
For example, although the gravity test method and the Karl Fischer method can directly measure the moisture content of the material, they cannot achieve continuous measurement; the product curve method basically depends on production experience and cannot achieve real-time measurement; and the infrared spectroscopy method is an indirect method. Difficulty in modeling, and requires operators to have higher theoretical literacy, it is difficult to apply in industrial production
[0005] Due to the above shortcomings of the traditional moisture measurement method, it brings great inconvenience to the real-time monitoring of moisture in the process.
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[0046] Such as figure 1As shown, a device for monitoring moisture changes in a vacuum drying process includes vacuum drying equipment and a moisture change monitoring system. The vacuum drying equipment includes a drying unit, a control unit, and an air extraction unit. The moisture change monitoring system includes a temperature and humidity sensor 8 And computer 9, described drying unit comprises drying chamber 1, heating plate 2, drying box 3 and dried material 4; Air extraction unit comprises vacuum pump 11, vacuum pump inlet 13, vacuum pump inlet pipe 5, vacuum pump exhaust port 10 , vacuum pump exhaust pipe 7, vacuum valve 12; The control unit is a drying system control panel 14, which is used to control the opening and closing of heating plate 2, vacuum pump 11, vacuum valve 12 and other equipment;
[0047] The drying chamber 1 is connected to the vacuum pump intake pipe 5, and a vacuum valve 12 is installed on the vacuum pump intake pipe 5, which is used to cut off or ...
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The invention discloses a method and device for monitoring the change of moisture content of materials in a vacuum drying process. Real-time monitoring of the drying progress can timely and accurately measure the drying end point, which is beneficial to energy saving and emission reduction; the water content estimation result has high accuracy and good repeatability; the monitoring method of the present invention is simple, easy to operate, and is suitable for large-scale industrial promotion.
Description
technical field [0001] The invention relates to the technical field of moisture monitoring in a vacuum drying process, in particular to a method and device for monitoring changes in moisture content of materials in a vacuum drying process. Background technique [0002] Vacuum drying is a common powder drying technology, which is widely used in chemical, pharmaceutical, medical and health fields, and is especially suitable for rapid and efficient drying of heat-sensitive, easily decomposed, and easily oxidized substances. [0003] Taking the vacuum drying of lithium batteries as an example, compared with other materials that need to be vacuum dried, lithium battery powder has the characteristics that the initial moisture content is usually low and the drying process requires the removal of moisture as much as possible. In order to remove moisture as much as possible, the drying time of battery powder is generally set for a long time, which leads to problems such as high proce...
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IPC IPC(8): G01N5/04F26B5/04
CPCG01N5/045F26B5/04
Inventor 赵凡张世伟韩峰张志军
Owner NORTHEASTERN UNIV LIAONING