Combined extrusion coupling homogenization dehydration method

Abstract

The invention provides a combined extrusion coupling homogenization dehydration method, and belongs to the technical field of drying methods. The method comprises the following steps: grinding grains,sieving, and drying to obtain grain powder; Carrying out twin-screw extrusion treatment on the grain powder; establishment of dynamic model, Starting fluidized bed device, adjusting device parameters, after the set parameter conditions of the fluidized bed are stable; the screen is placed in a fluidized bed to be fixed, the materials are flatly laid in the screen to be dried, the inlet air temperature, the drying air speed, the water adding amount and the drying time are substituted into a kinetic model formula, the moisture ratio MR is obtained, the dry basis moisture content is determined,the drying time of the materials in the fluidized bed is determined according to the national standard requirement, and material homogenizing dehydration is achieved; and putting the dried materials on an oven conveyor belt, and performing secondary puffing treatment to obtain the final product. By establishing the dynamic model, the drying rate and the material moisture content of the fluidized bed under different process conditions at different moments can be predicted to accurately control the fluidized bed, so that the purpose of homogenizing dehydration is achieved.

Description

technical field [0001] The invention belongs to the technical field of drying methods, and in particular relates to a combined extrusion coupling homogenization dehydration method. Background technique [0002] With the development of today's scientific and technological means, various processing and storage technologies are becoming more and more perfect, and drying has attracted more and more attention. As a technical means throughout the development of science and technology, drying has become a method that can reduce product weight and reduce It is an important means of reducing storage and transportation costs and extending the storage period. [0003] In the production and processing of convenience food, drying is an extremely important process, and different heat transfer methods have different degrees of influence on food raw materials. Traditional drying methods mainly include hot air drying, microwave drying, vacuum drying, and freeze drying. As a traditional dry...

AI Technical Summary

Problems solved by technology

However, due to the long-term contact of the material with high-temperature air in hot air drying, it is difficult to retain its color, aroma and taste, and the loss of heat-sensitive nutrients or active ingredients such as vitamins is relatively large.

Microwave drying has fast heating speed and high efficiency, but its disadvantages are uneven heating due to the difference in material structure, high local temperature, easy to form hard lumps, loss of product nutrition and flavor, and difficult to guarantee quality; vacuum drying, because of its low drying temperature It can maintain the original flavor and nutrition of the food to a certain extent, but the heat transfer rate is slow and the drying cycle is long; freeze drying, the dried material maintains the original chemical composition and physical properties, and the loss of nutrients is small, but Production costs are too high for widespread adoption

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