Method and drying device for drying fruits and vegetables through contact-type ultrasonic-assisted hot air drying mode and

A technology of hot air drying and ultrasonic wave, applied in the direction of drying gas arrangement, drying solid materials without heating, and promoting the preliminary treatment of solid material drying, can solve the problems of energy waste, shorten drying time, reduce energy consumption, etc., and achieve improved transmission efficiency. Heat mass transfer rate, save drying time, and improve product quality

Inactive Publication Date: 2018-10-12
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low drying efficiency of single hot air drying, poor quality of dehydrated vegetables obtained by drying, and energy waste caused by non-contact ultrasonic assisted drying of fruits and vegetables in the existing technology, the purpose of the present invention is to provide a contact ultrasonic assisted hot air drying A method for fruits and vegetables, which not only shortens the drying time and reduces energy consumption, but also effectively preserves the nutrients in fruits and vegetables

Method used

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  • Method and drying device for drying fruits and vegetables through contact-type ultrasonic-assisted hot air drying mode and
  • Method and drying device for drying fruits and vegetables through contact-type ultrasonic-assisted hot air drying mode and
  • Method and drying device for drying fruits and vegetables through contact-type ultrasonic-assisted hot air drying mode and

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Select fresh garlic with a complete shape and no pests and diseases, peel off the outer skin, wash and cut into thin slices with a thickness of 3 mm.

[0027] (2) Place the garlic slices on the drying tray, and adjust the height so that the garlic slices are in contact with the ultrasonic probe, adjust the drying temperature of the hot air drying oven to 60°C, the wind speed to 2.5m / s, and the ultrasonic power to 900W / m 2 , the ultrasonic frequency is 20kHz, and the drying end point can be reached after drying for 105 minutes.

Embodiment 2

[0029] (1) Select fresh garlic with a complete shape and no pests and diseases, peel off the outer skin, wash and cut into 2.7mm thick slices.

[0030] (2) Place the sliced ​​garlic on the drying tray, and adjust the height so that the sliced ​​garlic is in contact with the ultrasonic probe, adjust the drying temperature of the hot air drying oven to 60°C, the wind speed to 2.5m / s, and the ultrasonic power to 1500W / m 2 , the ultrasonic frequency is 20kHz, and the drying end point can be reached after drying for 85 minutes.

Embodiment 3

[0032] (1) Take fresh and clean cabbage and peel off 2 outer leaves, take the 3rd-10th leaf, and cut the parts with similar tissue thickness into small pieces of 1cm×1cm.

[0033] (2) Place the small pieces of cabbage on the drying tray and adjust the height so that the small pieces of cabbage are in contact with the ultrasonic probe. Adjust the drying temperature of the hot air drying oven to 60°C, the wind speed to 3.0m / s, and the ultrasonic power to 900W / m 2 , the ultrasonic frequency is 20kHz, and the drying end point can be reached after drying for 110 minutes.

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Abstract

The invention discloses a method and drying device for drying fruits and vegetables through a contact-type ultrasonic-assisted hot air drying mode. The method comprises the following steps that (1), the fruits and vegetables are preprocessed, wherein the fruits and vegetables are cleaned and sliced; and (2), ultrasonic-assisted hot air drying is carried out, wherein the processed fruits and vegetables are placed on a drying tray, a hot air drying device and an ultrasonic assistance drying device are sequentially turned on, an ultrasonic probe is located above the fruits and vegetables, the height of the drying tray is adjusted so that the fruits and vegetables directly make contact with the ultrasonic probe, and ultrasonic-assisted hot air drying is carried out on the fruits and vegetablesso as to obtain dehydrated fruits and vegetables. The method for drying the fruits and vegetables through the contact-type ultrasonic-assisted hot air drying mode adopts the combined action of ultrasonic cavitation, heat effect and mechanical effect, the quality and the structure of the materials are changed in the drying process, the hot air drying process is enhanced, the drying time of the fruits and vegetables is remarkably shortened, the drying time can be saved by 30%-60%, the product quality is effectively improved, and the nutrient loss of the dried fruits and vegetables is reduced.

Description

technical field [0001] The invention belongs to the technical field of food processing, and in particular relates to a method for drying fruits and vegetables with contact-type ultrasonic-assisted hot air and a drying device thereof. Background technique [0002] Thermal processing can maintain the stability of the product, among which thermal drying can reduce the quality and volume of food, reduce storage and transportation costs, and extend the shelf life of food. Commonly used traditional drying methods such as sun drying and hot air drying consume a lot of energy, take a long time to dry, and the quality of dried products is poor. Ultrasound is a mechanical energy wave with a frequency higher than 20kHz, which changes the structure or performance of the material, makes the material form a sponge-like structure, and makes the water easily transfer out through tiny channels, thereby shortening the drying time. Ultrasonic waves may also cause damage to cell membranes and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B9/06F26B5/02F26B21/10F26B21/12F26B1/00F26B25/18A23B7/02
CPCA23B7/02F26B1/005F26B5/02F26B9/06F26B21/10F26B21/12F26B25/18
Inventor 陶阳张静林韩永斌韩梦凡
Owner NANJING AGRICULTURAL UNIVERSITY
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