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Method for drying apple pieces by nitrogen source low-oxygen heat pump

A technology of apple slices and source heat pump, which is applied in the directions of heating and preserving fruits/vegetables, keeping fruits and vegetables fresh, and preserving fruits/vegetables through radiation/electrical treatment, etc., which can solve the problems of long drying time, slow drying speed, and low work efficiency. Reach the effect of reducing drying energy consumption, reducing oxidation loss and improving drying efficiency

Inactive Publication Date: 2013-12-18
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat pump drying currently used has the following problems: 1) In the middle and late stages of drying, the drying speed is slow and the drying time is long; 2) The heat pump drying requires intermittent work, and the work efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for drying apple chips with a nitrogen source hypoxic heat pump, comprising the following steps:

[0027] Step 1, select apples without damage and disease, clean the apples with tap water, and set aside;

[0028] Step 2, washing the apples treated in step 1 with dilute hydrochloric acid with a mass percentage concentration of 0.1%, then peeling and removing the core of the apples, and cutting the apples into slices with a slice thickness of 3 mm;

[0029] Step 3. Put the apple slices treated in step 2 into the color protection solution, and keep the color and solidify for 10 minutes. During the color protection process, apply ultrasonic treatment with a frequency of 22 kHz for 5 minutes. After the color protection, take out the cantaloupe slices and drain For later use, the color protection solution is composed of citric acid, calcium chloride, sodium chloride and water, wherein 2 g of citric acid, 1 g of calcium chloride and 1 g of sodium chloride are added to...

Embodiment 2

[0036] A method for drying apple chips with a nitrogen source hypoxic heat pump, comprising the following steps:

[0037] Step 1, select apples without damage and disease, clean the apples with tap water, and set aside;

[0038] Step 2, washing the apples treated in step 1 with dilute hydrochloric acid with a concentration of 0.1% by mass, then peeling and removing the core of the apples, and cutting the apples into slices with a slice thickness of 7 mm;

[0039] Step 3. Put the apple slices treated in step 2 into the color protection solution, and keep the color and solidify for 15 minutes. During the color protection process, apply ultrasonic treatment with a frequency of 22 kHz for 5 minutes. After the color protection, take out the cantaloupe slices and drain For future use, the color protection solution is composed of citric acid, calcium chloride, sodium chloride and water, wherein 6 g of citric acid, 2 g of calcium chloride and 3 g of sodium chloride are added to every ...

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Abstract

The invention belongs to the field of drying of agricultural products, and particularly relates to a method for drying apple pieces by a nitrogen source low-oxygen heat pump. The method comprises the following steps of cutting applies into pieces after the apples are selected, peeled and seeded, performing color protection, shape fixation, blanching and draining, drying the apple pieces in a nitrogen source heat pump dryer, drying the apple pieces in a vacuum drying box, and sealing and storing the apple pieces. According to the method, the drying energy consumption is reduced, the drying efficiency is improved, and the shortcomings of low drying efficiency and long drying time in the later drying period of heat pump drying are overcome; the apple pieces are subjected to heat pump drying and vacuum low-temperature drying after the color protection and blanching treatment, so that the problems of reduction of the gloss of the apple pieces and changes in colors are effectively solved; phenolic substances in the apples can be prevented from being oxidized to generate quinone, the oxidation loss of vitamin C can be reduced, the color and the texture of the apple pieces can be prevented from being damaged by an oxidation effect in a drying process, and dry products with natural colors can be obtained.

Description

technical field [0001] The invention belongs to the field of drying agricultural products, and in particular relates to a method for drying apple slices by a nitrogen source low-oxygen heat pump. Background technique [0002] Apples are sweet and sour, nutritious and one of the fruits suitable for all ages. my country's apple production accounts for more than 40% of the world's total production, ranking first in the world, but my country's apple consumption is mainly fresh food, and the conversion rate of apple processing is less than 6%, which is far lower than the world average (about 24%) . In recent years, the production of apple slices in my country has shown an obvious upward trend, and common drying techniques include frying technology, freeze-drying technology and microwave drying. Although frying technology and freeze-drying technology can obtain better quality products, the problem of oil content in the former still needs to be solved, while the latter consumes to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/157A23B7/154A23B7/015A23B7/022A23B7/005
CPCY02P60/85
Inventor 罗磊朱文学刘云宏白喜婷张晓宇张玉先支梓鉴杨彬朱敏
Owner HENAN UNIV OF SCI & TECH
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