Microwave spraying vacuum drying machine

Abstract

The invention relates to a microwave spraying vacuum drier for drying sticky materials, in particular for chemicals, Chinese traditional medicines and food, and the like, with strong thermal sensitivity as desiccant. The invention comprises a drying container, a feed inlet, a microwave feed-in device and a material atomization device arranged on the top part of the drying container, a container for drying finished products arranged on the lower part of the drying container, a metal screen arranged between the drying container and the container for drying finished products, a vacuum pump joint arranged on the lateral wall of the drying container, a material preheating components connected between the feed inlet and the material atomization device below the microwave feed-in port of the microwave feed-in device and a vibrating mechanism for delivering materials and preventing materials from being sticky to the wall surface. The vacuum drier of the invention has the advantages of simple production, wide application range, as well as comparatively high drying uniformity and efficiency.

Description

technical field [0001] The invention relates to a microwave spray vacuum dryer, which can be used for drying viscous materials, and is mainly used for drying and making powder of chemical, traditional Chinese medicine, food and other materials with strong heat sensitivity. Background technique [0002] Existing spray dryers heat materials to above 100°C, which may cause denaturation and loss of heat-sensitive components during the spray drying process for highly heat-sensitive chemical, traditional Chinese medicine, and food materials. [0003] The publication number CN1163313 published on October 29, 1997, "Microwave and Vacuum Atomization Drying Method and Device for Liquid Sugar", only partly eliminated the hot air heating technical scheme, and its microwave only heats the material liquid (i.e. similar to the preheating of this case), but there is no heating effect on the mist material, the heat that microwave can supply is only 8.5% of the required heat of vaporization, ...

AI Technical Summary

Problems solved by technology

[0002] The existing spray dryer heats the material to above 100°C, and it is easy to cause denaturation and loss of heat-sensitive components during the spray drying process for materials such as chemical industry, traditional Chinese medicine and food that are highly heat-sensitive.

[0003] The publication number CN1163313 published on October 29, 1997, "Microwave and Vacuum Atomization Drying Method and Device for Liquid Sugar", only partly eliminated the hot air heating technical scheme, and its microwave only heats the material liquid (i.e. similar to the preheating of this case), but there is no heating effect on the mist material, the heat that microwave can supply is only 8.5% of the required heat of vaporization, because it works under normal pressure, and the heating temperature is 90- 100°C, did not solve the problem of loss of heat-sensitive nutrients

[0004] On October 20th, 2004, the main problem of the "vacuum spray microwave drying system" with the publication number CN2650039 is: the first, due to the radiation of its microwave radiator Arranging the mouth in a straight line will not be conducive to the uniformity of heating; second, since the magnetron and microwave radiator are arranged below the material nozzle, the material is easy to deposit on it

If this "anti-microwave material" is a material that absorbs microwaves, then the microwave energy reaching the wall will accumulate on the wall of the drying chamber, causing the wall of the drying chamber to heat up, resulting in energy waste. In this case, the inner wall is sprayed with so-called " "anti-microwave material" has no positive effect at all, so there is no need to spray the so-called "anti-microwave material" on the inner wall; fifth, the system is also equipped with a steam system which is completely unnecessary, which complicates the structure of the equipment and increases the equipment cost

[0005] On January 4, 2006, the publication number is CN1714922 "Microwave Spray Dryer", which is not equipped with a vacuum system and works under normal pressure, and has not solved the problem. Heat Sensitive Nutrient Loss Issues

[0006]In addition, dew condensation occurs on the wall of the drying chamber of the existing microwave vacuum dryer, and the appearance of dew will seriously affect the thermal efficiency of the equipment and the productivity of the subsequent process

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