CN106658792B - A kind of improvement high-moisture percentage food and agricultural product radio frequency heating uniformity method - Google Patents
A kind of improvement high-moisture percentage food and agricultural product radio frequency heating uniformity method Download PDFInfo
- Publication number
- CN106658792B CN106658792B CN201611005210.5A CN201611005210A CN106658792B CN 106658792 B CN106658792 B CN 106658792B CN 201611005210 A CN201611005210 A CN 201611005210A CN 106658792 B CN106658792 B CN 106658792B
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- frequency heating
- agricultural product
- heated
- moisture percentage
- 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.)
- Expired - Fee Related
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
Abstract
The invention discloses a kind of food and agricultural product radio frequency heating method: (1) providing electromagnetic wave saddle, the electromagnetic waveguide is placed on the inside of material to be heated；(2) parallel upper bottom crown is provided, material and electromagnetic wave saddle are placed in the bottom crown middle position；(3) RF heating system is opened, radio frequency heating is carried out to the material to be heated；(4) internal batch temperature is monitored in real time using optical fiber temperature measurement system, stop radio frequency heating in due course.The present invention easily realizes being uniformly distributed for radio frequency heating material built-in field and temperature using new electromagnetic wave saddle, improves radio frequency heating efficiency, provides technical support for radiothermics optimization application.
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 technique
In food and agricultural product and processing of farm products, high-moisture percentage material is a major class, substantially includes 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 continuously improved, and food and farming industry are also increasingly paid attention to constantly mentioning under the premise of guaranteeing processing quality
High yield quality and production efficiency.
In food and Processing Farm Produce, heating is mostly important a production link and means all the time,
Its purpose mainly includes curing, drying and sterilization etc..Conventional heating methods include hot wind, hot water and steam etc., are had long
History, but there is also some problems simultaneously, such as the rate of heat addition is low, energy loss is big, processing efficiency is low and materials quality is poor
Deng.Therefore the new heating means of one kind are developed to have great significance to improve production efficiency and reduce energy consumption.
Electromagnetic dielectric heating as a kind of novel heating technique, with it quickly, the features such as cleaning and is easily-controllable and in recent years
Largely to be applied and be studied.Wherein radio frequency (30KHz~300MHz) heating technique has better choice to large scale material
Property heating and whole heating effect, have a good application prospect.But radiothermics is also because its field distribution will receive
The influence of material shapes and dielectric loss factor and be distorted, it is uneven so as to cause material heating, especially damaged in dielectric
In the case that the consumption factor constantly rises with the increase of material water ratio, radio frequency heating uniformity can be further reduced.Out
Expected heating effect is not only not achieved in existing non-uniform heating phenomenon, but also can destroy materials quality, especially eats to thermal sensitivity
The destruction of product and agricultural product nutritional ingredient is particularly acute.To improve radio frequency heating uniformity, the invention of University Of Agriculture and Forestry In Fujian's application
It is proposed in patent " the low thermally conductive agricultural product of one kind and food and agricultural product radio frequency heating method " (publication No.: CN 105554929A):
It is equal to improve radio frequency heating set on the side of the material and downside with unit of plastic packet identical with material dielectric constant to be heated
Even property, significant effect, but this method is only applicable to low-water-content material, and has certain Operating Complexity, it is difficult to it answers
For in actual production.Therefore, radio frequency heating uniformity and high-moisture percentage object can easily be improved by developing one kind
The new radio frequency heating method of material improves radio frequency processing technology and industrial applications has great significance.
Summary of the invention
To overcome the problems of the prior art, the purpose of the present invention is being directed to high-moisture percentage food and agricultural product material, mention
For it is a kind of it is applied widely, low in cost, easy to operate, low energy consumption, mentions suitable for the radio frequency heating new method of industrialized production
Firing frequency heating uniformity.
To achieve the above object, the present invention adopts the following technical scheme that:
A kind of high-moisture percentage food and agricultural product radio frequency heating method, provide a kind of electromagnetic waveguide plastic processing frame, the plastics
It is placed on inside material to be heated；It also needs to provide a kind of parallel plate electrode formula RF heating system, electromagnetic wave saddle will be configured with
Material to be heated is placed between bottom crown, and and bottom crown close to；Start RF heating system, material heated,
And optical fiber temperature measurement system real-time monitoring heating temperature is utilized, stop radio frequency heating in due course.
The electromagnetic waveguide is cross foam-plastic blocks.
The foamed plastics waveguide frame is placed in 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 collector are provided, the fibre system for supervising 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 are as follows: changed using the electromagnetic wave saddle of simple structure
Magnetic distribution state inside material, to accelerate it while improving high-moisture percentage material radio frequency heating uniformity
The rate of heat addition shortens heating time and reduces the energy consumption of material heating.The present invention it is applied widely, easy to operate, at
This is cheap and material uniformity to be heated is made to be significantly improved, and protects food and the original quality of agricultural product material, has
The value and significance of industrial applications.
Further, for material used in electromagnetic wave saddle, the material of other low dielectric loss factors can be used
To replace foamed plastics.
Container used in material when further, for radio frequency heating can also be contained with the container of other shapes rule
Fill material.
It further, equally can be using in the present invention for other dielectric loss factors or the higher material of moisture content
Method improve its radio frequency heating uniformity.
Detailed description of the invention
Fig. 1 is position view of the plastics electromagnetic waveguide in material
Fig. 2 is radio frequency heating principle and material placement schematic
Specific embodiment
The present invention is explained in detail in by the way of specific embodiment below, but the present invention is not limited to the embodiment.
The present invention the following steps are included:
(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, height are slightly less than the height of the heated material 2, and four side end faces of electromagnetic wave saddle and material container wall 3
It is in 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 equipped with electromagnetic wave saddle is placed in 5 center of bottom crown, 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, since the difference of dielectric loss factor makes object
Field distribution generates variation in material, improves the magnetic distribution state inside material, and then improve 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 holding is evenly heated.
(4) it also needs to provide optical fiber temperature measurement system 7, the optical fiber temperature measurement system is for material 2 to be heated described in real-time monitoring
Temperature, when it is implemented, fiber optic temperature measuring probe can be placed in the corresponding position of material, such as the edge of material to be heated
The middle part and.Predetermined temperature, which is reached, to material stops radio frequency heating.
The material to be heated 2 is high-moisture percentage agricultural product or food and agricultural product material, especially with powdered, semi-fluid shape
Material advantage is bigger；Below especially by being described in detail for potato starch:
Potato starch belongs to powdered preliminary working food and agricultural product, has in food and industrial circle and widely answers
With.In potato starch production procedure, after dewatering process is handled, the potato original for obtaining wet basis moisture content about 40% is formed sediment
Powder needs that it is dried to reach 17% safe storage moisture content below, main used in potato starch at present
Drying means is heated-air drying, this production link can consume a large amount of energy and time, raw with the green of current energy-saving and emission-reduction
Production, which is advocated, to be contradicted, therefore has very much realistic meaning using radio frequency heating drying mode improvement production technology.When it is implemented, considering
To industrialization processing convenience, using rectangular plastic container, it is put into according to container dimensional using foamed plastics production electromagnetic wave saddle
Container bottom, then the potato starch 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 potato starch；Radio frequency heating equipment uses 6kW, 27.12MHz radio frequency heating system
It unites, in the present embodiment, the size of plastic containers is 132 × 184 × 64mm3, and upper bottom crown spacing is 110mm, electromagnetic wave saddle
Height be 50mm, width 3.5mm, the height of potato starch is 54.2mm.
The foregoing is merely present pre-ferred embodiments, all equivalent changes done according to scope of the present invention patent with repair
Decorations, are all covered by 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 damage etc.
Problem is firstly introduced inside the simple foamed plastics electromagnetic wave saddle of structure to material and guides particular for high-moisture percentage material
Uniform electromagnetic field distribution, achieves ideal homogeneous heating effect, effectively shortens heating time, protect food and agricultural product
The original quality of material, greatly improves the industrial feasibility of radio frequency heating.
Claims (6)
1. a kind of improvement high-moisture percentage food and agricultural product radio frequency heating uniformity method, which is characterized in that provide a kind of foam
Plastics electromagnetic wave saddle, the electromagnetic wave saddle are cross foam-plastic blocks, and the electromagnetic waveguide is placed on material to be heated
Inside；The dielectric loss factor of the electromagnetic wave saddle is much smaller than material to be heated, parallel electrode plate is provided, by material and electricity
Magnetic wave saddle is placed in bottom crown middle position；RF heating system is opened, the material to be heated is heated.
2. a kind of improvement high-moisture percentage food according to claim 1 and agricultural product radio frequency heating uniformity method, special
Sign is that the material to be heated is placed in rectangular vessel.
3. a kind of improvement high-moisture percentage food according to claim 1 and agricultural product radio frequency heating uniformity method, special
Sign is that the electromagnetic waveguide is placed on inside material, and is in contact with container bottoms.
4. a kind of improvement high-moisture percentage food according to claim 1 and agricultural product radio frequency heating uniformity method, special
Sign is that the height of the electromagnetic wave saddle is less than the height of the material to be heated.
5. a kind of improvement high-moisture percentage food according to claim 1 and agricultural product radio frequency heating uniformity method, special
Sign is that material used in the foamed plastics is polystyrene.
6. a kind of improvement high-moisture percentage food according to claim 1 and agricultural product radio frequency heating uniformity method, special
Sign is, provides a kind of optical fiber temperature measurement system, and the optical fiber temperature measurement system is used to monitor in real time the temperature of 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 CN106658792A (en) | 2017-05-10 |
| CN106658792B true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113273678B (en) * | 2021-04-29 | 2022-06-14 | 南昌大学 | Preparation method of instant pure kudzu powder with natural particle structure retained |
| CN113645725B (en) * | 2021-08-16 | 2022-06-03 | 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 |
|---|
| "Evaluating radio frequency heating uniformity using polyurethane foams";Yunyang Wang;《Journal of Food Engineering》;20140326;第28-33页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106658792A (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106658792B (en) | A kind of improvement high-moisture percentage food and agricultural product radio frequency heating uniformity method | |
| CN204268837U (en) | A kind of drying equipment of core material of vacuum heat insulation plate | |
| CN105180616A (en) | Continuous type efficient grain microwave drying machine and structure optimizing method thereof | |
| CN102200373B (en) | Vacuum freeze-drying tester | |
| CN202873738U (en) | Novel tenebrio molitor dryer | |
| CN105276639A (en) | Microwave oven device for pyrolysis and pyrolysis method thereof | |
| CN213006127U (en) | Microwave curing device | |
| CN202149685U (en) | Microwave sintering furnace made of lithium ion battery material | |
| CN203919501U (en) | A kind of visual heating rotational molding device | |
| CN102833898A (en) | Electromagnetic heating device manufacturing method and electromagnetic heating device manufactured by same | |
| CN105554929A (en) | Radio frequency heating method for low-heat-conductivity agricultural product and food | |
| CN202013070U (en) | Microwave drying device for glass magnesium board | |
| CN205192099U (en) | Novel drying system | |
| CN205275606U (en) | Seed tank heating device for biological fermentation workshop | |
| CN204944050U (en) | A kind of water-bath Minton dryer for cylinder type lithium battery core | |
| CN201813577U (en) | Device for adjusting field intensity distribution in microwave heater | |
| CN204292169U (en) | Feed Manufacturing post curing device | |
| CN202482361U (en) | Well type transverse magnetic field applied heat treatment furnace | |
| CN203621400U (en) | Microwave drying equipment suitable for drying large-size sand model | |
| CN201571215U (en) | Honeycomb ceramic electric heating and energy-saving ring | |
| CN202773964U (en) | Dried beancurd stick making pot | |
| CN205156521U (en) | Vacuum drying oven | |
| CN208144340U (en) | A kind of self-temperature-control type tea frying equipment | |
| CN207019437U (en) | A kind of ammonium paratungstate drying equipment | |
| CN209042913U (en) | A kind of large size tea microwave drying unit |
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 |
Granted publication date: 20191101 Termination date: 20201110 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |