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Method for drying walnuts with hot air based on parabolic temperature rise method

A technology of hot air drying and heating method, which is applied in the direction of heating to dry solid materials, drying, food science, etc. It can solve the problems of long drying time, change of taste, easy discoloration of walnuts, etc., and achieve uniform moisture removal, uniform heating, and air-drying process simple effect

Inactive Publication Date: 2014-04-09
SHAANXI ZHIDAO AGRI SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially after bagging incompletely dried walnuts, the walnuts tend to change color and taste due to water evaporation and heat accumulation.
The traditional method of drying walnuts mainly relies on farmers to dry them naturally in the open air. It takes 7-12 days to reach the specified safe water content, and the drying time is relatively long.

Method used

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  • Method for drying walnuts with hot air based on parabolic temperature rise method
  • Method for drying walnuts with hot air based on parabolic temperature rise method
  • Method for drying walnuts with hot air based on parabolic temperature rise method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The method for the parabolic heating method hot air drying walnut of the present embodiment is made up of the following steps:

[0016] (1) After selecting and cleaning the walnuts, sort out the walnuts with peeled green skins;

[0017] Take nine-ripe walnut fruits that have been removed from the green peel, uniform in size, neat in shape, free of diseases and insect pests, and free of mold, remove the remaining green peel, silt, grass leaves and other sundries, put the peeled fruit into a basket, and put it in the pool for cleaning Finally, sorting is carried out on the belt sorting table, and the walnuts with green peels are not peeled off manually, and then peeled after concentration, and the walnuts with green peels peeled off are processed in the next step.

[0018] (2) The sorted walnuts are divided into 12kg / m 2 Spread the load on a well-permeable baking tray with a size of 30cm×60cm, place it on the drying rack of an ordinary baking room, adjust the temperature...

Embodiment 2

[0021] The method for the parabolic heating method hot air drying walnut of the present embodiment is made up of the following steps:

[0022] In step (2), sort the walnuts according to 12kg / m 2 Spread the load on a well-permeable baking tray with a size of 30cm×60cm, place it on the drying rack in the baking room, adjust the temperature in the baking room to 39.5°C, the relative humidity to 60%, and the wind speed to 3.5m / s, bake for 4.2 hours, adjust the temperature of the dried balls, control the temperature in the drying room to rise to 50°C, adjust the wind speed to 6m / s, and bake at a constant temperature for 4.2 hours to complete the heating and air-drying stage.

[0023] After completing the heating and air-drying stage in step (3), adjust the temperature of the drying chamber, lower it to 41°C, keep the relative humidity at 60%, adjust the wind speed to 4.5m / s, and bake at constant temperature for 17 hours until the moisture content of walnuts is about 12%, then low...

Embodiment 3

[0026] The method for the parabolic heating method hot air drying walnut of the present embodiment is made up of the following steps:

[0027] In step (2), sort the walnuts according to 12kg / m 2 The loading capacity is spread on a well-permeable baking tray with a size of 30cm×60cm, placed on the drying rack in the baking room, and the temperature in the drying room is adjusted to 40.5°C, the relative humidity is 70%, and the wind speed is 4.5m / s, bake for 3.8 hours, adjust the temperature of the dried balls, control the temperature in the drying room to rise to 50°C, adjust the wind speed to 6m / s, and bake at a constant temperature for 3.8 hours to complete the heating and air-drying stage.

[0028] After completing the heating and air-drying stage in step (3), adjust the temperature of the drying chamber, lower it to 42.5°C, keep the relative humidity at 70%, adjust the wind speed to 5.5m / s, and bake at constant temperature for 15 hours until the moisture content of walnuts...

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Abstract

The invention relates to a method for drying walnuts with hot air based on a parabolic temperature rise method, wherein the relative humidity of the environment is controlled and the drying temperature is controlled by the parabolic temperature rise method, so that even heating of walnut roasting and even moisture removal are realized; as a result, the walnut drying time is effectively shortened and the interior quality and flavor of the dry walnuts are guaranteed; and the air-drying process is simple.

Description

technical field [0001] The invention belongs to the technical field of walnut processing methods, in particular to a method for hot-air drying walnuts. Background technique [0002] Walnut, (Juglans regia L.) has another name called walnut, is Juglandaceae (Juglandaceae) Juglans L., deciduous tree. Walnuts are originally produced in southeastern Europe and western and southern Asia, but they were introduced into my country as early as the Han Dynasty and were planted in large quantities. Together with almonds, cashews, and hazelnuts, they are known as the world-famous "four major dried fruits" and are ancient cultivated plants. one. [0003] The fat content in the walnut kernel is as high as about 65%, and the unsaturated fatty acid in the fatty acid composition is more than 90%. The intake of unsaturated fatty acids has a positive effect on reducing human serum cholesterol levels and preventing atherosclerosis and thrombosis. Walnut oil is a special oil for high-grade hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L1/36F26B3/02A23N12/08A23L25/00
Inventor 张宝善张增帅陈锦屏
Owner SHAANXI ZHIDAO AGRI SCI & TECH DEV CO LTD
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