Vacuum dryer for screw to convey materials and method thereof

Abstract

The invention discloses a vacuum dryer for a screw to convey materials and a method thereof. The dryer comprises a vacuum drying device and a controller; the controller mainly comprising PLC and an upper computer, timely controls the rotate speed of a screw and the heating power of a ten-section resistance according to the detection data of the temperature and the humidity of the materials. The invention adopts a subsectional heating and drying control strategy giving consideration to both the drying quality and the production efficiency, comprises PID and predictive control, and a drying control strategy of the heating control and the linkage of the screw rotating speed; and the drying precision can be 98.8%. The invention is characterized by drying the inflammable and explosive materials and materials easy to be decomposed at a high temperature and no-air contacted materials. Furthermore, the vacuum operation reduces the steam pressure and the temperature, improves the temperature range between heating elements and the dried materials; the screw conveying increases the drying area, is benefit to evenly heating; a mechanism of screw rotating speed linkage based on the subsectional drying control strategy can not only ensure the high quality of the dried materials but also has high production efficiency.

Description

technical field [0001] The invention relates to the field of drying equipment and heating control, especially for the drying of some air pollution or inflammable and explosive products in the chemical industry, and especially relates to a vacuum dryer and a method for conveying materials by a screw. Background technique [0002] Modern dryers began to use fixed-bed dryers operated intermittently. In the middle of the 19th century, the use of the tunnel dryer marked the development of the dryer from intermittent operation to continuous operation. The rotary cylinder dryer can better realize the agitation of granular materials, and the drying capacity and strength can be improved. Some industries have developed continuous operation dryers that meet the requirements of the industry, such as drum dryers in the textile and paper industries. [0003] In the early 20th century, dairy production began to use spray dryers, which provided a powerful tool for large-scale drying of li...

AI Technical Summary

Problems solved by technology

Adjusting enterprises and cultivating the core competitiveness of enterprises in China is characterized by enterprises in the drying industry not doing this, not strong, not suitable, not perfect, but the overall quality is not high, most enterprises are backward in management, and do not meet the corresponding economies of scale , through the guidance and coordination of industry associations, change the situation of blind development

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