Microwave drying control system based on dielectric property dynamic change

A control system, microwave drying technology, applied in the direction of drying solid materials, heating to dry solid materials, drying, etc., can solve the problems of lack of, no optimized drying system, uncontrollable drying quality, etc., to prevent insufficient drying or burnt Paste, retain the effect of shelf life

Active Publication Date: 2017-06-13
JIANGNAN UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

The above drying methods, no matter whether they have monitoring and control or not, lack direct consideration and control of material quality during the drying process. Although the drying rate and energy consumption can be controlled to a certain extent, the drying quality is completely uncontrollable. There is no optimized drying system specially designed for microwave drying, and the optimization in consideration of dynamic changes in dielectric properties is completely blank

Method used

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  • Microwave drying control system based on dielectric property dynamic change
  • Microwave drying control system based on dielectric property dynamic change
  • Microwave drying control system based on dielectric property dynamic change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Take Radix Astragali as an example to illustrate the specific operation steps:

[0041] (1) Use network analyzer coaxial cable equipment to measure the dielectric loss factor of Astragalus membranaceus under different moisture conditions (fixed frequency is 2450MHz) with temperature changes. Taking moisture content and temperature as independent variables and dielectric loss factor ε" as dependent variable, the software is used to carry out binary regression fitting on the test data, and the dielectric loss ε" and moisture content and temperature of Astragalus membranaceus at a frequency of 2450 MHz are obtained. Mathematical model for the main influencing factors:

[0042] ε″ 2450-黄芪 =26.3124+0.2332w+0.1645t+0.0065w 2 -0.0004t 2 -0.0056wt

[0043] The relationship between the dielectric loss factor of Astragalus membranaceus and temperature and moisture under the microwave frequency of 2450MHz is as follows: image 3 shown.

[0044] (2) Input the ma...

Embodiment 2

[0047] Embodiment 2: take the ginkgo fruit as an example to illustrate the specific operation steps:

[0048] (1) Use network analyzer coaxial cable equipment to measure the dielectric loss factor of ginkgo fruit under different water conditions, which varies with temperature (fixed frequency is 915MHz). Taking water content and temperature as independent variables, and dielectric loss factor ε" as dependent variable, the software is used to carry out binary regression fitting on the experimental data, and the dielectric loss ε" and water content, water content, and Mathematical model with temperature as the main influencing factor:

[0049] ε″ 915-银杏果 =23.3415+0.0725w+0.2458t-0.0053w 2 +0.0008t 2 -0.0036wt

[0050] The relationship between the dielectric loss factor of ginkgo fruit and temperature and moisture under the microwave frequency of 915MHz is as follows: Figure 4 shown.

[0051] (2) Input the mathematical relationship model between the dielectric loss factor ...

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Abstract

The invention relates to a microwave drying control system based on a dielectric property dynamic change. A dielectric property dynamic change value of a material is monitored by pre-inputting a mathematical model so as to improve the quality the fruits and vegetables and medicinal materials of different batches and varieties after microwave drying. The whole process is as follows: firstly inputting a mathematic relation model of a dielectric constant, a dielectric dissipation factor and water and temperature distribution of the material at a certain frequency before microwave drying, and establishing a mathematical model library of the dielectric constant and the dielectric dissipation factor changing with temperature and water; performing online monitoring on the dynamic change value of the dielectric property in the microwave drying process by means of online real-time monitoring of water and temperature; and controlling the microwave drying process to optimize the drying quality of the material by integrally analyzing influence of the dielectric property, water and temperature on the drying process, wherein negative effects such as charring in the drying process is avoided.

Description

technical field [0001] The invention relates to the technical field of drying fruits, vegetables and Chinese medicinal materials, in particular to a microwave drying control system based on dynamic changes in dielectric properties. Background technique [0002] In recent years, there have been some researches on microwave drying of agricultural products in the world, and domestic related researches are also increasing year by year. Reiner Ihns et al. studied the drying process of two kinds of apricot fruits at different temperatures, compared the drying curves, chromaticity changes, nutritional components and energy consumption of constant-speed drying and reduced-speed drying, and concluded that the former had slightly lower energy consumption. In the latter, the chromaticity becomes worse with the increase of drying temperature [1] . Xu Mingliang and others compared the effects of different drying methods on the quality of dried sea asparagus, and found that the color an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B23/08F26B25/00
CPCF26B3/347F26B25/00
Inventor 宋春芳林振浩聂甜甜
Owner JIANGNAN UNIV
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