CN106839751B - A kind of microwave drying control system based on dielectric property dynamic change - Google Patents
A kind of microwave drying control system based on dielectric property dynamic change Download PDFInfo
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- CN106839751B CN106839751B CN201710197125.1A CN201710197125A CN106839751B CN 106839751 B CN106839751 B CN 106839751B CN 201710197125 A CN201710197125 A CN 201710197125A CN 106839751 B CN106839751 B CN 106839751B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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Abstract
The present invention relates to a kind of microwave drying control systems based on dielectric property dynamic change, pass through the quality of mathematical model pre-entered come real-time monitoring material dielectric property dynamic change value, after the microwave dryings such as Lai Tigao different batches, the fruits and vegetables of kind and medicinal material.Its whole process is: inputting the numerical relationship model of the dielectric constant of material, dielectric loss factor and moisture and Temperature Distribution under certain frequency first before microwave drying, establishes the Mathematic Model Library that dielectric constant and dielectric loss factor change with temperature and moisture；By on-line real time monitoring moisture and temperature, the dynamic change value of on-line monitoring microwave drying process intermediary electrical characteristics is realized；The influence of comprehensive analysis dielectric property, moisture and temperature to drying process controls microwave drying process, realizes the optimization of dry materials quality, and avoids generating in drying process simultaneously and the negative effect such as be charred.
Description
Technical field
It is to be related to one kind based on dielectric property dynamic change the present invention relates to fruits and vegetables and Chinese medicine technical field of drying
Microwave drying control system.
Background technique
In recent years, there are some researchs to the microwave drying of agricultural product in the world, domestic correlative study also increases year by year
It is more.Reiner Ihns et al. compares constant rate of drying and reduction of speed is dry by the drying process of two kinds of apricot fruits under research different temperatures
Dry drying curve, coloration variation, nutritional ingredient and energy consumption difference, show that the former energy consumption is slightly below the latter, and coloration
It is deteriorated again with the raising of drying temperature.Xu Mingliang et al. is by comparing different drying means to the shadow of extra large asparagus dry product quality
It rings, it is found that the color of product, reconstitution rate are between heated-air drying and freeze-drying under microwave drying.Huang foundation et al. has studied
A variety of seasonings of tremella, by comparison obtain tremella under microwave drying in addition to brightness value is slightly lower, remaining quality is superior to it
Its method, and energy consumption is very low.
Although many about the research of microwave drying both at home and abroad, all there is serious deficiencies, in microwave drying process
In, the drying regime of material cannot be grasped in time, blocked microwave drying technology to big industrial quick diffusion.Specific table
Now it is the following aspects: (1) online moisture, temperature measurement and control seldom is carried out to product in microwave drying process, led
It causes significantly to increase in final stage product temperature, cooked-on product；(2) product in the drying process by dry object can not be monitored
Phenomena such as qualitative change, frequently results in microwave drying deficiency, cooked-on, make it is dry after material there is taste bad, loss of flavor, color
The problems such as damp dim and rehydration ability decline.
In terms of patent, patent (publication number CN103005629A) discloses " microwave hot air combined jujube dryer ", specially
Sharp (publication number CN201974012U) is disclosed " microwave hot air combined drying equipment ", and patent (publication number CN102735034A) is public
" a kind of side air inlet microwave dryer " has been opened, though these equipment can complete the combined drying of microwave and hot wind, and it is entire
Drying process lacks effective monitoring and control, the design of drying process mostly according to constant temperature or empirical stage alternating temperature into
Row.Patent (publication number CN103263064A) discloses " a kind of microwave, hot wind and vacuum and its combined drying equipment ", relates to
Certain monitoring and control function.The above drying means, whether be monitored and controlled, in the drying process all lack pair
Directly considering and controlling in materials quality, although rate of drying and energy consumption can be by certain controls, dry quality
It is completely uncontrollable, and there is no the optimizing drying system specially designed for microwave drying at present, considering dielectric property dynamic
The optimization that variation aspect carries out is even more complete blank.
Summary of the invention
In view of the above-mentioned problems existing in the prior art, the applicant provides a kind of based on the micro- of dielectric property dynamic change
Wave drying control system.This system can realize material microwave drying quality by monitoring material dielectric property dynamic change value
Optimization, and avoid generating in drying process simultaneously and the negative effect such as be charred
Technical scheme is as follows:
A kind of microwave drying control system based on dielectric property dynamic change, the system comprises industrial computer data
Library module, neural network identification module, data acquisition module, microwave drying module and microwave control module；The control system
The drying process of microwave is monitored using the dielectric loss factor and dielectric constant of raw material to be dried.
The dielectric property of raw material to be dried is measured with the changing value of dried material temperature and moisture with Network Analyzer,
Data processing is carried out in industrial computer database module, obtains dielectric property i.e. dielectric loss factor and the water by dry feedstock
Divide the mathematical model with temperature relation；The moisture refers to the weight and material to be dried total weight of the water in material to be dried
Percentage.
The control system is come using obtained mathematical model, the i.e. changing value of dielectric loss factor and dielectric constant
Control the power of microwave and the action time of microwave drying.
Dielectric loss factor with by the detection method of the mathematical model of the moisture of dry feedstock and temperature relation are as follows: fixed frequency
Rate is respectively industrial microwave frequency i.e. 915MHz and domestic microwave frequency i.e. 2450MHz, is set using Network Analyzer coaxial cable
Under the conditions of under the different in moisture of standby measurement material, the dielectric loss factor that varies with temperature；
Using moisture content, temperature as independent variable, with dielectric loss factor ε " for dependent variable, test data is carried out using software
Binary regression fitting is respectively obtained in the case where frequency is 915MHz and 2450MHz, and dielectric loss ε " and moisture, the temperature of material are
Mathematical model, that is, fitting formula of major influence factors；
The dielectric loss factor and moisture and the secondary mathematical model of Temperature Distribution of the raw material to be dried are as follows:
ε”2450- is by dry feedstock=A1+B1w+C1t+D1w2-E1t2-F1wt
ε”915- is by dry feedstock=A2+B2w+C2t-D2w2+E2t2-F2wt
The A1、B1、C1、D1、E1、F1、A2、B2、C2、D2、E2、F2The dielectric property variation for respectively representing raw material to be dried is normal
Number；Different raw materials to be dried, which needs to test measurement in advance and analyzes, obtains A1、B1、C1、D1、E1、F1、A2、B2、C2、D2、E2、F2；
W is the moisture of dry feedstock, and t is drying temperature.
After the mathematical model entering computer database module that dielectric loss factor is changed with temperature and moisture, start micro-
Wave drying program continuously detects the moisture and temperature of material in drying process, the numerical value of material moisture and temperature is input to Jie
In electrical loss factor mathematical model, dielectric loss factor is calculated, and the changing rule of T is bent at any time in entire drying process
Line, the slope of calculated curve obtain in drying process the slope of a curve of T at any time, monitor the dry of slope of a curve and material
Drying quality when dielectric loss factor slope is less than 2%, and terminates microwave drying.
The method of the moisture of continuous detection material is the real-time weight by the material of data collecting module collected, by meter
It calculates, the real-time moisture of obtained material in the drying process.
Wherein, the output end with electronic scale of microwave drying module and the data acquisition channel of fibre optical sensor are connect, data
Acquisition module output end Connection Neural Network recognizes module input, neural network identification module output end and microwave control module
Input terminal connection, microwave control module output end are connect with microwave drying module input.
By Network Analyzer and coaxial cable technology test different water cut and at a temperature of material dielectric constant and Jie
The electrical loss factor, fixed frequency are 915MHz (industrial) and 2450MHz (household), obtain dielectric constant under two kinds of microwave frequencies
With the sub- factor of dielectric loss with the secondary math equation of temperature and moisture, and in advance in industrial computer input different batches,
The dielectric constants of the materials such as the fruits and vegetables and medicinal material of kind, the dielectric loss factor numerical relationship model with temperature and moisture respectively.
The present invention is beneficial to be had the technical effect that
Microwave drying control optimization system provided by the invention based on dielectric property dynamic change can it is online, effectively,
Quickly the dielectric constant of material and dielectric loss factor are detected, microwave power and microwave in real-time control drying process
Action time, to obtain best shelf-life and quality after the dry materials.
By real-time monitoring microwave drying process medium dielectric constant microwave medium, the dynamic change of dielectric loss factor, microwave function is realized
The On-line Control of rate and microwave action time provides and is different from common control system.For drying process intermediary electrical characteristics
Change more apparent material, can prevent from generating in the drying process dry insufficient or be charred phenomenon, after being conducive to microwave drying
The reservation of material flavor and the extension of shelf-life.
Detailed description of the invention
Fig. 1 is structural block diagram of the invention；
Fig. 2 is control block diagram of the invention；
Fig. 3 is the relationship of Radix Astragali dielectric loss factor and temperature and moisture in the case where microwave frequency is 2450MHz；
Fig. 4 is the relationship of ginkgo nut dielectric loss factor and temperature and moisture in the case where microwave frequency is 915MHz.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is specifically described.But these embodiments are not intended to limit this hair
Bright, structure that those skilled in the art are made according to these embodiments, method or transformation functionally include
Within the scope of the present invention.
Fig. 1 is a kind of microwave drying system structural block diagram based on dielectric property dynamic change, in conjunction with Fig. 2 it can be seen that packet
It includes with lower module:
1, microwave drying module
The container of micro-wave oven, storage material samples including dried material.Control element one controls with microwave power
It is connected, to realize microwave power control and microwave action time.
2, industrial computer database module
By the dielectric loss factor of different materials respectively and in temperature and the numerical relationship model of moisture input computer,
Mathematic Model Library is formed in computer systems.
3, data acquisition module
By acquisition channel, by the temperature acquired in real time and water uptake kinetics value feedback into computer, by calling number
Data calculating analysis, which is carried out, according to model library obtains dielectric loss factor in real time.
4, neural network identification module
Treated, and data pass to neural network identifier, are modeled by neural network identifier.Establish dielectric damage
Consume the image of the factor and temperature moisture.
5, control module
Control element one is connected with industrial computer, and other end is connected with micro-wave oven.
The forecast Control Algorithm of above-mentioned microwave drying Intelligent Adaptive Control system.
Embodiment 1: illustrate concrete operation step step by taking Radix Astragali as an example:
(1) it under conditions of being measured using Network Analyzer plumbing under the different in moisture of Radix Astragali, varies with temperature
The dielectric loss factor of (fixed frequency 2450MHz).Using moisture content, temperature as independent variable, with dielectric loss factor ε " be because
Variable carries out binary regression fitting to test data using software, obtains the dielectric loss ε " of the Radix Astragali in the case where frequency is 2450MHz
It is the mathematical model of major influence factors with moisture content, temperature:
ε”2450- Radix Astragali=26.3124+0.2332w+0.1645t+0.0065w2-0.0004t2-0.0056wt
Radix Astragali dielectric loss factor and relationship of temperature and moisture in the case where microwave frequency is 2450MHz is as shown in Figure 3.
(2) the dielectric loss factor mathematical relationship with temperature and moisture respectively of Radix Astragali is inputted in industrial computer in advance
Model.
(3) acquisition channel acquires microwave action time, temperature and moisture in microwave drying process in real time, monitors dielectric in real time
The dynamic change value of constant, dielectric loss factor, and dielectric loss factor and temperature water are obtained by neural network identification module
The relationship image divided controls the microwave drying time according to the variation for the slope of curve that dielectric loss factor varies with temperature, and realizes
The optimization of dry materials quality.
Using traditional microwave drying, the later stage of drying, it is uneven that material can generate microwave drying, and dry Radix Astragali is to wet safely
After base moisture, it may appear that part coking, partially dried insufficient problem.So the Radix Astragali product later period is dry and is not suitable for using
Microwave drying.Microwave drying is high-efficient, and speed is fast, and microwave combined heated-air drying Radix Astragali can reduce total drying time, dry
Time shortens 1/2, and guarantees product quality.But microwave drying terminating point is difficult to judge, present system provides preferable controls
The method of microwave drying terminal, adopts this method, and Radix Astragali quality drying uniformity significantly improves, and product quality is secure.
Embodiment 2: illustrate concrete operation step step by taking ginkgo nut as an example:
(1) under conditions of being measured using Network Analyzer plumbing under the different in moisture of ginkgo nut, become with temperature
Change the dielectric loss factor of (fixed frequency 915MHz).Using moisture content, temperature as independent variable, with dielectric loss factor ε " be because
Variable carries out binary regression fitting to test data using software, obtains the dielectric loss of the ginkgo nut in the case where frequency is 915MHz
ε " and moisture content, the mathematical model that temperature is major influence factors:
ε”915- ginkgo nut=23.3415+0.0725w+0.2458t-0.0053w2+0.0008t2-0.0036wt
Ginkgo nut dielectric loss factor and relationship of temperature and moisture in the case where microwave frequency is 915MHz is as shown in Figure 4.
(2) dielectric loss factor for inputting ginkgo nut in industrial computer in advance is closed with the mathematics of temperature and moisture respectively
It is model.
(3) acquisition channel acquires microwave action time, temperature and moisture in microwave drying process in real time, monitors dielectric in real time
The dynamic change value of constant, dielectric loss factor, and by neural network identification module obtain dielectric constant and dielectric loss because
It is dry to control microwave according to the variation for the slope of curve that dielectric loss factor varies with temperature for the relationship image of son and temperature moisture
The dry time realizes the optimization of dry materials quality.
Dry using traditional industrial microwave, the later stage of drying material can generate that microwave drying is uneven, and dry ginkgo nut arrives
After safe wet basis moisture 15%, it may appear that part coking, partially dried insufficient problem.So the ginkgo fruit product later period is dry
It using other drying modes (heated-air drying), can effectively guarantee product quality, and be reduced about than the traditional heated air drying time
1/3 drying time.But the dry terminating point of industrial microwave is difficult to judge, present system provides preferable control microwave drying is whole
The method of point, adopts this method, the ginkgo nut drying quality uniformity significantly improves, and product quality is secure.
Claims (5)
1. a kind of microwave drying control system based on dielectric property dynamic change, the control system include industrial computer number
According to library module, neural network identification module, data acquisition module, microwave drying module and microwave control module；Its feature exists
In: the control system monitors the drying process of microwave using the dielectric loss factor and dielectric constant of raw material to be dried；
After the mathematical model entering computer database module that dielectric loss factor is changed with temperature and moisture, starting microwave is dry
Dry program continuously detects the moisture and temperature of material in drying process, and the numerical value of material moisture and temperature is input to dielectric damage
It consumes in factor mathematical model, dielectric loss factor variation rule curve of T at any time in entire drying process, meter is calculated
Slope of a curve is calculated, the slope of a curve of T at any time is obtained in drying process, monitors the drying matter of slope of a curve and material
Amount when dielectric loss factor slope is less than 2%, and terminates microwave drying.
2. control system according to claim 1, it is characterised in that: measure Jie of raw material to be dried with Network Analyzer
Electrical characteristics carry out data processing in industrial computer database module, obtain with the changing value of dried material temperature and moisture
Dielectric property, that is, dielectric loss factor with by the mathematical model of the moisture of dry feedstock and temperature relation；The moisture refers to dry
The weight of water in dry material and the percentage of material to be dried total weight.
3. control system according to claim 2, it is characterised in that: the control system utilizes obtained mathematical modulo
The changing value of type, i.e. dielectric loss factor and dielectric constant controls the power of microwave and the action time of microwave drying.
4. control system according to claim 2, it is characterised in that: dielectric loss factor with by the moisture of dry feedstock with
The detection method of the mathematical model of temperature relation are as follows: fixed frequency is respectively industrial microwave frequency i.e. 915MHz and domestic microwave frequency
Rate, that is, 2450MHz varies with temperature under the conditions of under the different in moisture of Network Analyzer plumbing measurement material
Dielectric loss factor；
Using moisture content, temperature as independent variable, with dielectric loss factor ε " for dependent variable, binary is carried out to test data using software
Regression fit is respectively obtained in the case where frequency is 915MHz and 2450MHz, and the dielectric loss ε " and moisture, temperature of material are main
Mathematical model, that is, fitting formula of influence factor；
The dielectric loss factor and moisture and the secondary mathematical model of Temperature Distribution of the raw material to be dried are as follows:
ε″2450- is by dry feedstock=A1+B1w+C1t+D1w2-E1t2-F1wt
ε″915- is by dry feedstock=A2+B2w+C2t-D2w2+E2t2-F2wt
The A1、B1、C1、D1、E1、F1、A2、B2、C2、D2、E2、F2Respectively represent the dielectric property variation constant of raw material to be dried；
Different raw materials to be dried, which needs to test measurement in advance and analyzes, obtains A1、B1、C1、D1、E1、F1、A2、B2、C2、D2、E2、F2；W is
The moisture of dry feedstock, t are drying temperature.
5. control system according to claim 1, it is characterised in that: the method for the moisture of continuous detection material is by data
The real-time weight of the material of acquisition module acquisition, by calculating, the real-time moisture of obtained material in the drying process.
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| CN108089062A (en) * | 2017-12-17 | 2018-05-29 | 江南大学 | A kind of detection method of porous media dielectric constant |
| CN108089105A (en) * | 2017-12-17 | 2018-05-29 | 江南大学 | A kind of dielectric property detection method of pine nut |
| CN108089063A (en) * | 2017-12-17 | 2018-05-29 | 江南大学 | A kind of dielectric property detection method of oil crops |
| CN109490243A (en) * | 2018-12-29 | 2019-03-19 | 深圳职业技术学院 | The system and monitoring method of material appearance during on-line monitoring microwave freeze-drying |
| CN109769922A (en) * | 2019-03-01 | 2019-05-21 | 江南大学 | A kind of device and method of the dry terminal intelligent control of high starch dried fruit based on low field nuclear-magnetism |
| CN110618365B (en) * | 2019-11-03 | 2021-06-15 | 西南交通大学 | Low-voltage cable state evaluation method based on dielectric response characteristics |
| CN111337753B (en) * | 2020-03-16 | 2021-07-30 | 昆明理工大学 | Method for adjusting dielectric constant of high-calcium magnesium titanium concentrate under microwave heating condition |
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