Negative-pressure microwave uniform spraying and drying device and application

Abstract

The invention discloses a negative-pressure microwave uniform spraying and drying device and application, belonging to the technical field of uniform drying devices. The negative-pressure microwave uniform spraying and drying device comprises a circulating material storage device, a feeder, a negative-pressure spraying pipe, a microwave heating cavity, a cyclone separator, a vacuum storage tank, a discharger, a water ring vacuum pump, a circulating pipe and microwave sources. The circulating material storage device is used for storing materials dried circularly, the feeder is used for feeding dry materials to the negative-pressure spraying pipe which is a channel for drying and circulating the materials, and the microwave sources are uniformly distributed inside the microwave heating cavity, two ends of which are sealed. The cyclone separator is connected with an outlet of the negative-pressure spraying pipe inside the microwave heating cavity and is connected with the vacuum storage tank and the discharger through a channel. The discharger is connected with the circulating material storage device through the circulating pipe. Because the materials can be sprayed under negative pressure, the device can be used for spraying, rotating and circulating the materials under a microwave vacuum drying condition so as to achieve the purpose of drying the materials efficiently and uniformly, meanwhile, is favorable for shortening the drying time by above 40% and reducing the cost of large-scale production.

Description

technical field [0001] The invention relates to a method and a device for uniformly drying materials under microwave-assisted conditions, which are suitable for negative pressure microwave uniform spraying and drying of particle materials in food, chemical, agricultural and other industries. The utility model belongs to the technical field of a uniform drying device. Background technique [0002] Today's conventional materials, especially fruit and vegetable dehydration processing technology and equipment (mainly atmospheric pressure hot air drying and freeze drying) are relatively mature. The use of microwave-assisted freeze-drying, hot air processing technology and equipment is an important direction to upgrade the traditional fruit and vegetable dehydration processing industry. At present, the general idea of ​​research on efficient drying of materials is mainly focused on using microwave, far infrared, high frequency and other internal heating sources for combined dryin...

AI Technical Summary

Problems solved by technology

However, microwave drying with the most prominent features of high efficiency and energy saving has very significant heating unevenness (cold and hot spots), which leads to a significant decline in its drying quality (overheated coking and undercooling), and the uniformity of the finished product is only 50%-60% %, the cost of reprocessing has increased significantly

At the same time, there are three outstanding problems and demands in my country's export dehydrated agricultural product processing industry: (1) The drying of agricultural products has problems such as high energy consumption, long drying time, and high cost, and there is a strong demand for efficient drying technology

Traditional hot air drying of fruit and vegetable products has poor sensory quality and low rehydration rate; conventional freeze-drying technology and equipment can retain the sensory and nutritional quality of dehydrated vegetable products to the greatest extent, but the processing time is long and the production cost is high. The defect of high consumption has become a bottleneck restricting the development of the agricultural product dehydration industry

(2) Efficient drying of agricultural products has problems such as poor uniformity, low yield, and aggravated deterioration of product comprehensive quality. There is a strong demand for efficient and uniform drying technology

However, the drying of materials under negative pressure, especially the use of microwaves, has not been studied.

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