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Method for preparing water chestnut whole powder by superheated steam and hot air combined-drying

A technology of combined drying and superheated steam, applied in food drying, drying gas arrangement, lighting and heating equipment, etc., can solve the problems of high production cost, low cost, material cell damage, etc. The effect of simplifying the machining process

Inactive Publication Date: 2018-09-28
JINING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the cost of hot air drying is low, and it is widely used in food processing, but the drying time is long, the material cells are easily damaged in the hot air drying process, the product rehydration is not good, and the color, texture, flavor and nutritional value of the finished product are also poor. Undesirable changes will occur
Vacuum freeze-dried products have the advantages of good rehydration and less loss of nutrients, but this technology also has some problems such as long drying time, high cost, and small production capacity, which limits its application in the food industry to a certain extent
Microwave drying has fast drying speed and high product quality, but the production cost is high

Method used

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  • Method for preparing water chestnut whole powder by superheated steam and hot air combined-drying
  • Method for preparing water chestnut whole powder by superheated steam and hot air combined-drying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of superheated steam and the method for preparing water chestnut whole powder by combined drying of hot air, comprise the following steps:

[0020] Select mature water chestnut, peel and cut into 0.5cm thin slices, drain the water quickly after washing, lay it flat on the drying tray, and directly put it into the hot steam-hot air integrated drying equipment, the temperature is 180°C, and the wind speed is 8m / s , the pressure is 7Mpa, when the moisture content of the wet basis at the drying conversion point is 21%, turn off the hot steam generator, restore the pressure to normal, and carry out hot air drying at a wind speed of 5m / s and a temperature of 70°C until the moisture content is 6 %. Dried slices are crushed through an 80-mesh sieve, packaged, and finished.

Embodiment 2

[0022] A kind of superheated steam and the method for preparing water chestnut whole powder by combined drying of hot air, comprise the following steps:

[0023] Select mature water chestnuts, peel and cut into 0.5cm slices, drain the water quickly after washing, lay flat on the drying tray, and directly put them into the hot steam-hot air integrated drying equipment, temperature: 170 ° C, wind speed 7m / s, the pressure is 6Mpa, and when the moisture content of the wet basis at the drying conversion point is 22%, turn off the hot steam generator, restore the pressure to normal, and carry out hot air drying at a wind speed of 5m / s and a temperature of 85°C until the moisture content is 8 %. Dried slices are crushed through an 80-mesh sieve, packaged, and finished.

Embodiment 3

[0025] A kind of superheated steam and the method for preparing water chestnut whole powder by combined drying of hot air, comprise the following steps:

[0026] Select mature water chestnuts, peel and cut into 0.5cm thin slices, drain the water quickly after washing, lay flat on the drying tray, and directly put them into the hot steam-hot air integrated drying equipment, temperature: 165 °C, wind speed 6m / s, the pressure is 6Mpa, and when the moisture content of the wet base at the drying conversion point is 26%, turn off the hot steam generator, restore the pressure to normal, and carry out hot air drying at a wind speed of 5m / s and a temperature of 90°C until the moisture content is 8 %. Dried slices are crushed through an 80-mesh sieve, packaged, and finished.

[0027] Comparative test 1

[0028] The whole water chestnut powder is dried with hot air, the difference is that the water chestnut slices are pretreated for color protection, steamed, and then dried by a singl...

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Abstract

The present invention discloses a method for preparing water chestnut whole powder by superheated steam and hot air combined-drying, and belongs to the technical field of food processing. Water chestnuts are used as a raw material; the superheated steam and hot air combined-drying is conducted; the superheated steam and hot air combined-drying uses a superheated steam and hot air integration drying device; a superheated steam generator is turned on to conduct the superheated drying; the drying is conducted until a breaking point of a wet base water content of 25%-30%; the superheated steam generator is turned off; pressure is restored to normal; the hot-air drying is conducted; then crushing is conducted; and the water chestnut whole powder is prepared. Compared with vacuum freeze drying,microwave drying, etc., the drying method of the superheated steam and hot air combined drying for preparing the water chestnut whole powder effectively reduces investment costs, saves energy, shortens drying time and simplifies the preparation technology. Compared with traditional single hot air drying, nutrition, appearance and rehydration of the product are much higher than those of the productobtained by the single hot air drying.

Description

technical field [0001] The invention belongs to the technical field of food processing, and in particular relates to a method for preparing whole water chestnut powder by combined drying of superheated steam and hot air. Background technique [0002] Water chestnut powder is a kind of water chestnut dehydrated products, mainly fresh and mature water chestnut as raw material, peeled, selected, sliced ​​to protect color, steamed, dried, and crushed to obtain food processing raw materials. Drying technology is the key technology in the production process of water chestnut powder. [0003] At present, there are many drying techniques, and the final forms of products obtained by different drying methods are different. According to literature reports, the drying method of potato snowflake powder is relatively simple, and drum drying is generally used. Different from snowflake powder, there are many drying methods for potato powder and sweet potato powder, such as hot air drying, ...

Claims

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Application Information

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IPC IPC(8): A23L19/00A23L5/10A23L5/20F26B21/00F26B21/14
CPCA23V2002/00A23L5/13A23L5/17A23L5/21A23L19/01F26B21/001F26B21/14A23V2300/10
Inventor 魏海香梁宝东
Owner JINING UNIV
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