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E-mail
vanchytech@163.com
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Phone
18357802585
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Address
Zhejiang South Yungu Industrial Park, Nanyang Avenue, Longwan District, Wenzhou City
Wenzhou Yunchi Technology Co., Ltd
The working principle and wide application of scraper type vacuum pressure reducing concentrator
Date: 2025-08-28Read: 5
Scraper type vacuum pressure reducing concentrator is an efficient concentration equipment that combines thin film evaporation technology and vacuum pressure reducing principle. Its working principle and application fields are as follows:
1、 Working principle
1. Thin film formation mechanism
The liquid material enters from the upper part of the equipment in the tangential direction, and under the action of centrifugal force, gravity, and scraper, forms a rotating and descending thin film layer on the heating wall. The thickness of the liquid film can be precisely controlled through the scraper gap (0.7-1.5mm). This design significantly increases the heat transfer area, resulting in a total heat transfer coefficient of 1163~3489 W/m ² · K.
2. Synergistic effect of vacuum decompression
By using a vacuum system to lower the boiling point of materials (such as reducing the boiling point to 40 ℃ when the vacuum degree is 0.09MPa), combined with jacket heating to provide a heat source, low-temperature rapid evaporation can be achieved. The secondary steam is liquefied and separated by a condenser, and the concentrated liquid is discharged from the bottom. The vacuum environment also reduces the risk of decomposition of thermosensitive substances.
3. Advantages of dynamic heat transfer
The scraper continuously updates the liquid film to avoid wall coking, and the material is heated for only 10-45 seconds, making it particularly suitable for thermosensitive substances. The turbulent state of the liquid film further reduces thermal resistance and enhances evaporation intensity.
2、 Widely applicable fields
1. Pharmaceutical and Food Industry
Used for concentrating high viscosity materials (up to 100Pa · s) such as traditional Chinese medicine extracts, honey, and fruit juice, retaining active ingredients and preventing coking. For example, low-temperature vacuum concentration of alcohol extract can avoid the destruction of active ingredients.
2. Chemical and Environmental Treatment
Suitable for dyes and resin solutions containing suspended particles, as well as sludge reduction in wastewater treatment. Its anti scaling properties can handle materials that are prone to crystallization.
3. Special material handling
It has significant advantages over materials that are heat sensitive, prone to foaming, or contain solids (such as dairy products and starch), and the concentration of the finished product can be flexibly adjusted.
This device achieves efficient and energy-saving concentration goals through the collaboration of thin film technology and vacuum system, and has become the core equipment for difficult material processing.
