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Method for sequentially drying walnuts through drum-type constant-temperature infrared rays and hot air

A hot air drying and drum-type technology, which is applied in the direction of non-progressive dryers, biomass drying, drying solid materials, etc., to achieve the effect of shortening the drying time, simple equipment, and efficient drying

Inactive Publication Date: 2020-04-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no research report on the use of drum-type constant temperature infrared and hot air to dry walnuts in sequence at home and abroad. It is urgent to provide a complete set of process solutions and infrared processing equipment.

Method used

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  • Method for sequentially drying walnuts through drum-type constant-temperature infrared rays and hot air
  • Method for sequentially drying walnuts through drum-type constant-temperature infrared rays and hot air
  • Method for sequentially drying walnuts through drum-type constant-temperature infrared rays and hot air

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: drum type constant temperature infrared pre-drying

[0028] The drum type constant temperature infrared pre-drying method of fresh walnuts is carried out according to the following steps:

[0029] (1) Remove the outer layer of green skin from the picked fresh walnuts, rinse them with clean water, and drain the surface moisture;

[0030] (2) Adjust the infrared radiation distance to 25cm. Adjust the infrared radiation temperature of catalytic infrared generators 1 and 2 to 450 °C. Adjust the rotation speed of the drum to 35Hz. Then pour the fresh walnuts into the feeding hopper, stop the infrared pre-drying after the walnuts come out of the discharge port, and obtain the infrared pre-dried walnuts;

[0031] (3) Determination of moisture content decline rate, chromaticity change value and shell opening rate of samples: take 20 walnuts and record the initial dry basis moisture content WC of samples respectively 0 and surface chromaticity ΔE 0 , and then ...

Embodiment 2

[0036] The test treatment process is the same as in Example 1, the difference being that the infrared radiation distance is 30 cm, and the specific results are shown in Table 1.

Embodiment 3

[0038] The test treatment process is the same as in Example 1, the difference being that the infrared radiation distance is 35 cm, and the specific results are shown in Table 1.

[0039] Table 1 Effects of different infrared radiation distances on moisture content drop rate, chromaticity change value and shell opening rate

[0040] Example Radiation distance (cm) Moisture content drop rate (%) Chromaticity change value Shell opening rate (%) Remark Example 1 25 7.724±1.410 12.427±2.854 0 small area tan Example 2 30 7.267±0.631 8.403±1.561 0 none Example 3 35 7.046±0.881 8.474±2.083 0 none

[0041]It can be found that the moisture content reduction rate of samples of comparative examples 1-3 in Table 1, the moisture content reduction rate on a dry basis of walnuts decreases with the increase of the board distance, and the board distance of 25 cm is better than the board distance of 30 cm and better than the board distance ...

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Abstract

The invention discloses a method for sequentially drying walnuts through drum-type constant-temperature infrared rays and hot air and relates to the technical field of agricultural product and food processing. The method comprises the steps that the distance between an infrared generator and a sample is adjusted to 30 cm; the infrared radiation temperature is adjusted to 450 DEG C; the drum speedis adjusted to 25 Hz; and fresh green husk-removed walnuts are pre-dried by infrared rays (9.5 min), and then immediately transferred to 43 DEG C, and continue to be subjected to hot air drying for 16h under the condition of the wind speed of 3m / s to obtain walnut products sequentially dried through drum-type constant-temperature infrared rays and hot air. Compared with single hot air drying (20h), the total time is shortened by 19.2%. Through the innovative design of drum-type catalytic infrared pre-drying, the drying time is greatly shortened, and energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the technical field of agricultural products and food processing, and in particular relates to a drum-type constant temperature infrared and hot air sequential drying technology for walnuts. Background technique [0002] Walnut is a nut with high nutritional value, rich in protein, unsaturated fatty acid and other nutrients, and has high economic value. The output of walnuts is increasing year by year, and the harvesting time is relatively concentrated. The moisture content of fresh walnuts after picking is relatively high (40%-55%). One of the most common processing methods to extend shelf life. [0003] Traditional hot air drying is to use hot air at a temperature of 40-50°C to dry the raw materials to safe moisture (8%), so as to achieve the effect of safe preservation. However, this method has long drying time, low drying efficiency and low energy utilization rate. In recent years, a new drying method-infrared drying met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B11/04F26B21/10F26B23/02F26B25/02F26B25/16F26B25/22
CPCF26B11/04F26B21/001F26B21/004F26B21/10F26B23/02F26B25/02F26B25/16F26B25/22F26B2200/02
Inventor 曲文娟凡威马海乐汤雯雯蔡丽春曹非凡
Owner JIANGSU UNIV
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