CN106658792A - Method for improving radio-frequency heating uniformity of high-water content food and agricultural products - Google Patents
Method for improving radio-frequency heating uniformity of high-water content food and agricultural products Download PDFInfo
- Publication number
- CN106658792A CN106658792A CN201611005210.5A CN201611005210A CN106658792A CN 106658792 A CN106658792 A CN 106658792A CN 201611005210 A CN201611005210 A CN 201611005210A CN 106658792 A CN106658792 A CN 106658792A
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- frequency heating
- heated
- agricultural product
- food
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
- General Preparation And Processing Of Foods (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
Abstract
The invention discloses a food and agricultural product radio frequency heating method. The method includes the following steps that: (1) an electromagnetic waveguide frame is provided, wherein the electromagnetic waveguide frame is arranged in a material to be heated; (2) an upper electrode plate and a lower electrode plate which are parallel to each other are provided, and the material and the electromagnetic waveguide frame are arranged at the middle of the lower electrode plate; (3) a radio frequency heating system is turned on to perform radio frequency heating on the material to be heated; and (4) an optical fiber temperature measuring system is adopted to monitor the temperature of the interior of the material, and radio frequency heating is stopped at a right moment. According to the method of the invention, the novel electromagnetic waveguide frame is adopted, so that the uniform distribution of an electromagnetic field and temperature inside the material under the radio frequency heating can be realized conveniently and simply, the efficiency of the radio frequency heating can be improved, and technical support can be provided for the optimal application of radio frequency heating technologies.
Description
Technical field
The invention belongs to food and agricultural product and technical field of agricultural product process, and in particular to a kind of high-moisture percentage food and
Agricultural product radio frequency heating uniformity improved method.
Background technology
In food and agricultural product and processing of farm products, high-moisture percentage material is a big class, substantially including semi-finished product, life
Fresh and semi-fluid food and agricultural product.In recent years, with both at home and abroad to food and agricultural product and processing of farm products safety and its processing
The requirement of efficiency is improved constantly, and food and farming industry are also increasingly paid attention to constantly being carried on the premise of processing quality is ensured
High yield quality and production efficiency.
In food and Processing Farm Produce, heating is all the time an of paramount importance production link and means,
Its purpose mainly includes curing, dry and sterilization etc..Conventional heating methods include hot blast, hot water and steam etc., there is long
History, but while some problems are there is also, such as rate of heat addition is low, energy loss is big, working (machining) efficiency is low and materials quality is poor
Deng.Therefore a kind of new heating means are developed and is had great significance improving production efficiency and reducing energy consumption.
Electromagnetic dielectric heating as a kind of new heating technique, with its quick, cleaning and it is easily-controllable the features such as and in recent years
Come by substantial amounts of application and research.Wherein radio frequency (30KHz～300MHz) heating technique has preferably selection to large scale material
Property heating and overall heating effect, have a good application prospect.But radiothermics is also because its Electric Field Distribution can be subject to
The impact of material shapes and dielectric loss factor and be distorted, so as to cause material heating it is uneven, especially dielectric damage
In the case that the consumption factor constantly rises with the increase of material water ratio, radio frequency heating uniformity can be further reduced.Go out
Existing non-uniform heating phenomenon does not only reach expected heating effect, and can destroy materials quality, and especially thermal sensitivity is eaten
The destruction of product and agricultural product nutrient content is particularly acute.To improve radio frequency heating uniformity, the invention of University Of Agriculture and Forestry In Fujian's application
A kind of patent " low heat conduction agricultural product and food and agricultural product radio frequency heating method " (publication No.：CN 105554929A) middle proposition：
It is equal to improve radio frequency heating with the week side of boss and downside that the material is located at material dielectric constant identical unit of plastic bag to be heated
Even property, effect is significant, but the method is only applicable to low-water-content material, and with certain Operating Complexity, it is difficult to should
For in actual production.Therefore, developing one kind can easily improve radio frequency heating uniformity, and high-moisture percentage thing is can be suitably used for again
The new radio frequency heating method of material, improves radio frequency processing technology and industrial applications has great significance.
The content of the invention
To overcome the problems of the prior art, the purpose of the present invention is, for high-moisture percentage food and agricultural product material, to carry
For a kind of applied widely, with low cost, simple to operate, energy consumption it is low, be suitable to the radio frequency heating new method of industrialized production to carry
Firing frequency heating uniformity.
For achieving the above object, the present invention is adopted the following technical scheme that：
A kind of high-moisture percentage food and agricultural product radio frequency heating method, there is provided a kind of electromagnetic waveguide plastic processing frame, the plastics
It is placed on inside material to be heated；Also need to provide a kind of parallel plate electrode formula RF heating system, electromagnetic wave saddle will be configured with
Material to be heated is positioned between bottom crown, and is pressed close to bottom crown；Start RF heating system, material heated,
And using optical fiber temperature measurement system real-time monitoring heating-up temperature, radio frequency heating is stopped in good time.
The electromagnetic waveguide is cross foam-plastic blocks.
The foamed plastics waveguide frame is positioned over cuboid material center position and its four side end face and contacts with chamber wall.
The foamed plastics waveguide frame height must not exceed height of materials.
The foamed plastics waveguide frame dielectric loss factor is needed far below material to be heated.
The material of the foamed plastics waveguide frame is polystyrene.
A kind of optical fiber temperature measurement system, including fibre-optical probe and data acquisition unit are provided, the fibre system is used for prison in real time
Survey the radio frequency heating temperature of material, reed time controll radio frequency heating.
Compared with prior art, the device have the advantages that being：Changed using the electromagnetic wave saddle of simple structure
Magnetic distribution state inside material, so as to accelerate it while high-moisture percentage material radio frequency heating uniformity is improve
The rate of heat addition, shortens the heat time and reduces the energy consumption of material heating.The present invention it is applied widely, simple to operate, into
This is cheap and makes material uniformity to be heated be significantly improved, and protects food and the original quality of agricultural product material, has
The value and significance of industrial applications.
Further, for the material that electromagnetic wave saddle is used, it is possible to use the material of other low-dielectric loss factors
To replace foamed plastics.
Further, for the container that material during radio frequency heating is used, it is also possible to contained with the container of other shapes rule
Dress material.
Further, the material higher for other dielectric loss factors or moisture content, equally can be using in the present invention
Method improving its radio frequency heating uniformity.
Description of the drawings
Fig. 1 is position view of the plastics electromagnetic waveguide in material
Fig. 2 is radio frequency heating principle and material placement location schematic diagram
Specific embodiment
It is explained in detail in the present invention by the way of specific embodiment below, but the present invention is not limited to embodiment.
The present invention is comprised the following steps：
(1) as shown in figure 1, electromagnetic wave saddle 1 is mounted inside material 2, the waveguide frame is cross solid foam
Unit of plastic, it is highly slightly less than the height of the heated material 2, and four side end faces of electromagnetic wave saddle and material container wall 3
Contact, wherein, the dielectric loss factor of electromagnetic wave saddle should be much smaller than material to be heated.
(2) as shown in Fig. 2 the material to be heated that will be equipped with electromagnetic wave saddle is positioned over the center of bottom crown 5, and it is located at
Between the top crown 4 being parallel to each other and bottom crown 5, under the support of this structure, because the difference of dielectric loss factor causes thing
Electric Field Distribution produces change in material, improves the magnetic distribution state inside material, and then improves radio frequency heating temperature.
(3) radio-frequency signal generator 6 being connected with the top crown 4 is opened, radio frequency heating is carried out to material 2, in heating process
In, material keeps uniform heating.
(4) also need to provide optical fiber temperature measurement system 7, the optical fiber temperature measurement system is used for material to be heated 2 described in real-time monitoring
Temperature, when being embodied as, fiber optic temperature measuring probe can be positioned over the relevant position of material, such as the edge of material to be heated
And middle part.Treat that material reaches predetermined temperature and stops radio frequency heating.
The material to be heated 2 is high-moisture percentage agricultural product or food and agricultural product material, especially with powder, semi-fluid shape
Material advantage is bigger；Below especially by being described in detail as a example by farina：
Farina belongs to powder preliminary working food and agricultural product, has in food and industrial circle and widely should
With.In farina production procedure, after dewatering process process, the former shallow lake of potato of wet basis moisture content about 40% is obtained
Powder, needs to be dried it to reach less than 17% safe storage moisture content, and it is main that current farina is used
Drying means is heated-air drying, and this production link can consume the substantial amounts of energy and time, raw with the green of current energy-saving and emission-reduction
Product is advocated and contradicted, therefore has very much realistic meaning using radio frequency heating drying mode improvement production technology.When being embodied as, it is considered to
To industrialization processing facility, using rectangular plastic container, electromagnetic wave saddle is made using foamed plastics according to container dimensional and is put into
Container bottom, then the farina 500g that wet basis moisture content is 31.55% is filled into container, wherein Jie of foamed plastics
The electrical loss factor is well below high-moisture percentage farina；Radio frequency heating equipment adopts 6kW, 27.12MHz radio frequency heating system
System, in the present embodiment, the size of plastic containers is 132 × 184 × 64mm3, and upper and lower polar plate spacing is 110mm, electromagnetic wave saddle
Height be 50mm, width is 3.5mm, and the height of farina is 54.2mm.
The foregoing is only present pre-ferred embodiments, all impartial changes done according to scope of the present invention patent with repair
Decorations, should all belong to the covering scope of the present invention.
The present invention is many in order to solve existing agricultural product material radio frequency dielectric heating uniformity difference and materials quality infringement etc.
Problem, particular for high-moisture percentage material, the foamed plastics electromagnetic wave saddle for being firstly introduced simple structure is guided to material inside
Uniform electromagnetic field is distributed, and achieves preferable homogeneous heating effect, effectively shortens the heat time, protects food and agricultural product
The original quality of material, drastically increases the industrial usability of radio frequency heating.
Claims (7)
1. one kind improves high-moisture percentage food and agricultural product radio frequency heating uniformity method, it is characterised in that provide a kind of foam
Plastics electromagnetic wave saddle, the electromagnetic waveguide is placed on the inside of material to be heated；Parallel electrode plate is provided, by material and electromagnetism
Waveguide frame is positioned over the bottom crown centre position；RF heating system is opened, the material to be heated is heated.This
The uniformity of the bright material built-in field for realizing radio frequency heating and Temperature Distribution improves.
2. one kind according to claim 1 improves high-moisture percentage food and agricultural product radio frequency heating uniformity method, and it is special
Levy and be, the material to be heated is placed in rectangular vessel.
3. one kind according to claim 1 improves high-moisture percentage food and agricultural product radio frequency heating uniformity method, and it is special
Levy and be, the electromagnetic waveguide is placed on inside material, and is contacted with container bottoms.
4. one kind according to claim 1 improves high-moisture percentage food and agricultural product radio frequency heating uniformity method, and it is special
Levy and be, the electromagnetic wave saddle is cross foam-plastic blocks, the height of the electromagnetic wave saddle is less than the material to be heated
The height of material.
5. one kind according to claim 1 improves high-moisture percentage food and agricultural product radio frequency heating uniformity method, and it is special
Levy and be, the foamed plastics electromagnetic wave saddle dielectric loss factor needs the dielectric loss factor far below material to be heated.
6. one kind according to claim 5 improves high-moisture percentage food and agricultural product radio frequency heating uniformity method, and it is special
Levy and be, the material that the foamed plastics is used is polystyrene.
7. one kind according to claim 1 improves high-moisture percentage food and agricultural product radio frequency heating uniformity method, and it is special
Levy and be, there is provided a kind of optical fiber temperature measurement system, the optical fiber temperature measurement system is used for the temperature of monitor in real time material to be heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611005210.5A CN106658792B (en) | 2016-11-10 | 2016-11-10 | A kind of improvement high-moisture percentage food and agricultural product radio frequency heating uniformity method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611005210.5A CN106658792B (en) | 2016-11-10 | 2016-11-10 | A kind of improvement high-moisture percentage food and agricultural product radio frequency heating uniformity method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106658792A true CN106658792A (en) | 2017-05-10 |
| CN106658792B CN106658792B (en) | 2019-11-01 |
Family
ID=58805768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611005210.5A Expired - Fee Related CN106658792B (en) | 2016-11-10 | 2016-11-10 | A kind of improvement high-moisture percentage food and agricultural product radio frequency heating uniformity method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106658792B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113273678A (en) * | 2021-04-29 | 2021-08-20 | 南昌大学 | Preparation method of instant pure kudzu powder with natural particle structure retained |
| CN113645725A (en) * | 2021-08-16 | 2021-11-12 | 西南大学 | Radio frequency heating uniformity self-adjusting device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105554930A (en) * | 2016-02-25 | 2016-05-04 | 福建农林大学 | Multistage scheme variable radio frequency heating method |
| CN105554929A (en) * | 2016-02-25 | 2016-05-04 | 福建农林大学 | Radio frequency heating method for low-heat-conductivity agricultural product and food |
-
2016
- 2016-11-10 CN CN201611005210.5A patent/CN106658792B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105554930A (en) * | 2016-02-25 | 2016-05-04 | 福建农林大学 | Multistage scheme variable radio frequency heating method |
| CN105554929A (en) * | 2016-02-25 | 2016-05-04 | 福建农林大学 | Radio frequency heating method for low-heat-conductivity agricultural product and food |
Non-Patent Citations (1)
| Title |
|---|
| YUNYANG WANG: ""Evaluating radio frequency heating uniformity using polyurethane foams"", 《JOURNAL OF FOOD ENGINEERING》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113273678A (en) * | 2021-04-29 | 2021-08-20 | 南昌大学 | Preparation method of instant pure kudzu powder with natural particle structure retained |
| CN113273678B (en) * | 2021-04-29 | 2022-06-14 | 南昌大学 | Preparation method of instant pure kudzu powder with natural particle structure retained |
| CN113645725A (en) * | 2021-08-16 | 2021-11-12 | 西南大学 | Radio frequency heating uniformity self-adjusting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106658792B (en) | 2019-11-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105180616A (en) | Continuous type efficient grain microwave drying machine and structure optimizing method thereof | |
| CN106658792A (en) | Method for improving radio-frequency heating uniformity of high-water content food and agricultural products | |
| CN103075872B (en) | Microwave hot-air dehydrating and drying equipment for agricultural and sideline products | |
| CN102986838A (en) | Intermediate wave infrared and radio frequency combined drying method suitable for dehydration of large-scale seasoning edible mushrooms | |
| CN204268837U (en) | A kind of drying equipment of core material of vacuum heat insulation plate | |
| CN102200373B (en) | Vacuum freeze-drying tester | |
| CN103423979B (en) | A kind of tunnel type microwave drying machine | |
| CN202873738U (en) | Novel tenebrio molitor dryer | |
| CN105554929A (en) | Radio frequency heating method for low-heat-conductivity agricultural product and food | |
| CN204247913U (en) | Evaporative pattern special microwave flash baking cabin | |
| CN106820206B (en) | Rotary drum type microwave drying equipment | |
| CN205192099U (en) | Novel drying system | |
| CN202013070U (en) | Microwave drying device for glass magnesium board | |
| CN102524381B (en) | Microwave vibration bed drying method of medium moisture content granular grains | |
| CN105554930B (en) | A kind of multistage becomes the radio frequency heating method of scheme | |
| CN205454131U (en) | Multi -stage becomes radio frequency heating apparatus of scheme | |
| CN209002802U (en) | Drying box is used in a kind of processing of soft sweets | |
| CN205454130U (en) | Low heat conduction agricultural product and food radio frequency heating apparatus | |
| CN204295941U (en) | Tire radial pattern microwave vulcanization machine | |
| CN209042913U (en) | A kind of large size tea microwave drying unit | |
| CN207901496U (en) | Vulcanizing press with Hybrid Heating source | |
| CN205156521U (en) | Vacuum drying oven | |
| CN204757559U (en) | Electro -thermal blowing drying box | |
| CN206989272U (en) | From Wetting microwave stove | |
| CN104690858A (en) | Radiation type microwave vulcanizing machine for tire |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191101 Termination date: 20201110 |