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

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

Example Embodiment

[0018] Example 1:

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

[0020] Choose mature water chestnuts, peel them and cut them into 0.5cm thin slices. After washing, quickly drain the water, place them flat in a drying tray, and put them directly into the integrated hot steam-hot air drying equipment at a temperature of 180°C and a wind speed of 8m / s. , The pressure is 7Mpa, when the wet base moisture content of the drying transition point is 21%, turn off the hot steam generator, restore the pressure to normal, and perform hot air drying at a wind speed of 5m / s, a temperature of 70°C, and drying to a moisture content of 6 %. The dried slices are crushed through an 80-mesh sieve, packaged, and finished.

Example Embodiment

[0021] Example 2

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

[0023] Select mature water chestnuts, peel them and cut them into 0.5cm thin slices. After washing, quickly drain the water, place them in a drying tray, and put them directly into the integrated hot steam-hot air drying equipment, temperature: 170℃, wind speed 7m / s, when the pressure is 6Mpa and the wet base moisture content of the drying transition point is 22%, turn off the hot steam generator, restore the pressure to normal, and perform hot air drying at a wind speed of 5m / s, a temperature of 85°C, and drying to a moisture content of 8 %. The dried slices are crushed through an 80-mesh sieve, packaged, and finished.

Example Embodiment

[0024] Example 3

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

[0026] Select mature water chestnuts, peel them and cut them into 0.5cm slices. After washing, quickly drain the water, place them flat in a drying tray, and put them directly into the integrated hot steam-hot air drying equipment, temperature: 165℃, wind speed 6m / s, when the pressure is 6Mpa and the moisture content of the wet base at the drying transition point is 26%, turn off the hot steam generator, restore the pressure to normal, and perform hot air drying at a wind speed of 5m / s, a temperature of 90℃, and drying to a moisture content of 8 %. The dried slices are crushed through an 80-mesh sieve, packaged, and finished.

[0027] Comparative test 1

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

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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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