Drying technological method with cooling stage and device thereof

Abstract

The invention relates to a drying technology of agricultural by-products and a device thereof and particularly relates to a drying technological method with a cooling stage and a device thereof. The drying technological method comprises the following steps of conducting feeding, drying and cooling; conducting one-time repeated drying or repeated drying and cooling several times or conducting repeated drying, cooling and drying several times, wherein the percentage difference of the water content in the material to the water content out the material after drying each time is not smaller than 20%. Through implementation of the technical scheme, the material is dried in a dryer for a period of time and is subsequently cooled; when the material is cooled, the water in the material is balancedexternally and is used for supplementing the external water; the rapid dewatering effect is achieved, and the material is tempered; the material is uniformly dried; the water discharging quantity is increased; the material can be tempered in the cooling stage, and the water is rapidly discharged; the internal water can naturally supplement the external water; the material can be evenly dewatered;the color of the material is unchanged; the original color and the original taste of the material are retained; the deformation rate is reduced; the drying time is improved by more than 30%; and the energy is reduced by more than 25%.

Description

technical field [0001] The application relates to a drying process and device for agricultural by-products, in particular to a drying process and equipment with a cooling section. Background technique [0002] At present, the mesh belt dryer has been widely used for drying agricultural and sideline products such as red dates, red peppers, gourd seeds, melon seeds, stevia, mulberry leaves, fruits and vegetables. The surface shape of agricultural and sideline products is relatively strict, such as color, taste, Product phase, dry and wet uniformity, surface shape, etc. [0003] The current drying method is as follows: (1) Drying: When the material enters the mesh belt dryer from the inlet, it is dried in a "Z" shape through the multi-layer mesh belt, and runs to the outlet; due to the short drying time, the running stroke Also short, when the material runs to the outlet, some of the material is still dry; (2) Circulation: the material whose moisture does not reach the specifi...

AI Technical Summary

Problems solved by technology

The efficiency of such secondary and repeated drying is not high, and the daily output is low

[0004] In addition, the moisture content of agricultural and sideline products is relatively high, and the time required for dehydration is relatively long. The material spends 4 to 5 hours, or even 8 to 10 hours. The material is stuffed in the dryer for a long time, and the color of the dried material, Great changes in taste and product phase, uneven drying and wetness, serious surface deformation

For example: when roasting red peppers, the red peppers are easy to turn yellow, dry and wet unevenly, some burnt paste accounts for more than 10%, and some are still not dry; when baking melon seeds, the melon seeds are easy to warp and deform The rate is more than 20%

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