CN104697303A - Microwave hot-blast air coupling drying system for acquiring optimal drying curve - Google Patents
Microwave hot-blast air coupling drying system for acquiring optimal drying curve Download PDFInfo
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- CN104697303A CN104697303A CN201310673692.1A CN201310673692A CN104697303A CN 104697303 A CN104697303 A CN 104697303A CN 201310673692 A CN201310673692 A CN 201310673692A CN 104697303 A CN104697303 A CN 104697303A
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Abstract
The invention provides a microwave hot-blast air coupling drying system for acquiring an optimal drying curve, and aims to obtain the optimal drying schemes for various dried materials to obtain the optimal drying rate and lower power consumption, and check the existing drying schemes. The system comprises a closed drying cavity, a microwave heater, a hot-blast air generator, a weight measuring device, a temperature measuring device, a computer, a signal acquisition control system, a power control circuit, and a corresponding signal processing and control algorithm.
Description
Technical field
The invention belongs to nonmetallic substance (as vegetables and fruits, Chinese herbal medicine etc., in the drying of containing metal material, microwave is limited) technical field of drying, relate to a kind of microwave hot air coupling drying system for obtaining optimum drying curve specifically, this system is mainly used in the drying proposal for various dried material design optimization, and has the function of testing to drying proposal and the existing drying proposal of design.
Background technology
Heated-air drying, as a kind of traditional drying means, has the advantages that equipment is simple, production cost is low, but shortcoming to be rate of drying slow.And microwave drying just in time overcomes the slow shortcoming of rate of drying, be applied to more and more in current food and agricultural product drying.But there is the uneven problem of heating in microwave drying, the situation of material surface temperature far below internal temperature often can occur.Therefore, the dry problem that effectively can solve rate of drying and uniform drying of hot wind and microwave coupling.
Microwave hot air be coupled dry in, patent (publication number CN102735034A) discloses " a kind of side air inlet microwave dryer ", patent (publication number CN103005629A) discloses " microwave hot air combined red date dryer ", patent (publication number CN201974012U) discloses " microwave hot air combined drying equipment ", though these equipment can complete the combined drying of microwave and hot blast, but whole dry run lacks effective monitoring and controls, and the design of dry run is many to be carried out according to constant temperature or experimental stage alternating temperature.Patent (publication number CN103263064A) discloses " a kind of microwave, hot blast and vacuum and combined drying equipment thereof ", relate to certain monitor and forecast function, but does not belong to automatic control, more can not accomplish the optimization of dry run.
This microwave hot air coupling drying system, combines microwave and hot blast technique with multiple proportion-controllable, and single method also can be selected dry.This system utilizes multiple sensing technology and computer acquisition control system, set up two complete backfeed loops, with parameters such as the power of this accurate control system in dry run and temperature, on the one hand by the optimum drying curve scheme of experimental design, dry run is made accurately to carry out according to the scheme designed in advance on the other hand, and can inspect existing industrial drying proposal, judge its reasonability.The main application direction of this system is not directly for large industrial production, but for various specific dried material, optimal design drying process, finally instructs industrial production, improves the quality of drying efficiency and product.
Summary of the invention
Patent of the present invention provides a kind of microwave hot air coupling drying system, the object designing this system is: for the drying proposal of various dried material design optimization, to obtain fast and rate of drying and lower energy consumption, and system can be used for the inspection of existing drying proposal.Its summary of the invention comprises: drying chamber, microwave heating equipment, hot air generator, weight-measuring device, temperature measuring equipment, computer and signal acquisition control system, power control circuit and software section.
The drying chamber of above-mentioned microwave hot air coupling drying system is cylindrical, band can open top cover for loading and unloading material, middle part disposal mesh bracket on the lower side in cavity, dried material is placed on bracket, drying chamber sidewall establishes three to seal feed-through, from bottom to top respectively in order to connect hot blast admission line, optic fiber thermometer ((FBG) demodulator) and hot blast discharge duct, drying chamber comprises bracket and feed-through all adopts polytetrafluoroethylene (PTFE) material to adapt to microwave environment, and whole drying chamber carries out check weighing under hanging on electronic balance.
The microwave heating equipment of above-mentioned microwave hot air coupling drying system is a micro-wave oven, rotating magnetron is positioned at bottom furnace chamber, the power of magnetron is controlled by bidirectional thyristor for regulating voltage module (in order to control microwave power), power, from 0 to 2000W continuously adjustabe, ensures the uniformity of microwave simultaneously from room and time.
The hot air generator of above-mentioned microwave hot air coupling drying system forms without oily silent air compressor, flow valve, tube electric heater (built-in K type thermocouple) by one, stable compressed air is produced without oily silent air compressor, flow valve is in order to regulate hot blast speed, tube electric heater power is controlled by bidirectional thyristor for regulating voltage module (in order to control hot blast power), and built-in K type thermocouple is in order to temperature control coarse adjustment and warning simultaneously.
The weight-measuring device of above-mentioned microwave hot air coupling drying system is an electronic balance, and in order to avoid effect of microwave, adopt overhead lower draw-bar to whole drying chamber check weighing, electronic balance band 0 ~ 5V analog voltage exports (to data acquisition control card) or RS232 exports.
The temperature measuring equipment of above-mentioned microwave hot air coupling drying system comprises the conventional thermocouple thermometric outside microwave field and the optical fiber Bragg diffraction grating temperature sensor thermometric in microwave field, K type thermocouple is positioned at the tube electric heater port of export, 0 ~ 5V analog voltage is provided by bidirectional thyristor for regulating voltage module, input to data acquisition control card, No. 4 fibre optic temperature sensors are positioned at drying chamber hot blast environment and dried material is surperficial and inner, export 0 ~ 5V analog voltage signal by optic fiber thermometer ((FBG) demodulator), input to data acquisition control card.
The signal acquiring system of above-mentioned microwave hot air coupling drying system comprises an x86 computer (but being not limited only to this) and forms with one piece of NI-USB series data acquisition and control card (but being not limited only to this), data acquisition control card accepts 1 road K type Thermocouple Temperature Signal, 4 road fiber temperature signals and No. 1 electronic balance check weighing signal, amount to 6 road analog input signals, two-way 0 ~ 5V analog voltage control signal is provided simultaneously, controls two bidirectional thyristor for regulating voltage modules respectively.
The power control circuit of above-mentioned microwave hot air coupling drying system is two bidirectional thyristor for regulating voltage modules, is serially connected with tube electric heater power input and microwave magnetron power input respectively, is controlled the power of hot blast and microwave by 0 ~ 5V analog signal.
The software section of above-mentioned microwave hot air coupling drying system realizes with the Labview programming platform based on windows system, be responsible for the quantification of process 6 road analog input signal and record, hot blast temperature feedback control algorithm, temperature of charge feedback control algorithm, 2 tunnel control signals output and record (according to the relation of phase shift angle and control voltage, calculating for power consumption), control drying process based on the optimum efficiency drying temperature curve extraction algorithm of orthogonal test and continuous alternating temperature (also can be used for constant temperature and stage alternating temperature).
Accompanying drawing explanation
Fig. 1 is this patent capital equipment composition diagram.
In Fig. 1: 1. without oily silent air compressor; 2. tube electric heater (built-in K type thermocouple); 3. drying chamber; 4. dried material; 5. gas flowmeter; 6. electronic balance; 7. optic fiber thermometer ((FBG) demodulator); 8. data acquisition control card; 9. computer; 10. bidirectional thyristor for regulating voltage module (in order to control hot blast power); 11. bidirectional thyristor for regulating voltage modules (in order to control microwave power); 12. micro-wave ovens.
Detailed description of the invention
Embodiment 1: heated-air drying
During operation, arranging the second modulating output perseverance in computer [9] is zero, makes bidirectional triode thyristor module [11] control signal be zero, forbidding second feed back loop (in order to control microwave power).Compressed air exports from without oily silent air compressor [1], along " solid line " air-flow, hot blast is formed through tube electric heater [2], enter drying chamber [3], through the netted bracket diffuse underneath bodily form uniformly hot blast through material, then discharge, eventually pass gas flowmeter [5] and discharge drying system.Tube electric heater [2] built-in thermoelectric even thermometric, drying chamber [3] hot blast environment thermometric and dried material [4] thermometric three road signal stream input data acquisition control card [8], select unlike signal composition backfeed loop according to the actual requirements.
Embodiment 2: microwave drying
During operation, arranging the first modulating output perseverance is zero, makes bidirectional triode thyristor module [10] control signal be zero, forbids the first backfeed loop (in order to control hot blast power).Compressed air, from without oily silent air compressor [1] input, directly enters drying chamber without any heating, in order to take the water vapour in microwave drying process out of.Optical fiber material thermometric and bidirectional triode thyristor module [11] form backfeed loop.
Embodiment 3: microwave hot air coupling is dry
During operation, hot-air flow runs along the solid line in Fig. 1, and signal stream (comprising transducing signal and control signal) runs along the dotted line in Fig. 1.By drying chamber [3] environment thermometric, optic fiber thermometer [7], data acquisition control card [8] input, reference signal (drying proposal curve), PID controller, data acquisition control card [8], bidirectional triode thyristor module [10] and tube electric heater [2] composition first backfeed loop.Second backfeed loop is formed by dried material [4] thermometric, optic fiber thermometer [7], data acquisition control card [8] input, reference signal (drying proposal curve), PID controller, data acquisition control card [8], bidirectional triode thyristor module [11] and micro-wave oven [12].By the time m-weight distribution curve that electronic balance [6] records, calculate and obtain moisture content and dehydration rate change curve, inspect the efficiency of current drying proposal (prioritization scheme that native system obtains or other existing industrial drying proposal) with this.
More than describe embodiments of the present invention in detail, but the example just lifted for ease of understanding, should not be regarded as limitation of the scope of the invention.Any person of ordinary skill in the field all according to the description of technical scheme of the present invention and preferred embodiment thereof, can make various possible equivalent change or replacement, but all these change or replace and all should belong to claims of the present invention.
Claims (4)
1., for obtaining a microwave hot air coupling drying system for optimum drying curve, it is characterized in that: this system is coordinated by specially designed soft and hardware system; Hot blast, microwave or both modes of coupling can be adopted to carry out drying; Detect and control drying regime (weight/moisture content, environment temperature, temperature of charge) continuously in dry run, obtaining the continuous alternating temperature drying curve of optimum of specific material based on drying efficiency (fast with energy-conservation).
2. the microwave hot air coupling drying system for obtaining optimum drying curve according to claim 1, is characterized in that: hardware components is made up of close drying chamber, microwave heating equipment, hot air generator, weight-measuring device, temperature measuring equipment, computer and signal acquisition control system and power control circuit; Software section is by inputting the process of each signal and record, forming based on PID and two feedback control algorithms of fuzzy logic and the output of control signal and record.
3. the microwave hot air coupling drying system for obtaining optimum drying curve according to claim 1, it is characterized in that: can by controlling compressed gas source and microwave power, select the drying of singlehanded section or the drying of hot wind and microwave coupled modes flexibly, and the ratio of hot blast and microwave can be adjusted arbitrarily.
4. the microwave hot air coupling drying system for obtaining optimum drying curve according to claim 1, it is characterized in that: utilize data collecting card and computer system, to in dry run, weight of material, temperature of charge and environment temperature are carried out continuous print detection and are controlled, and are realized by two backfeed loops.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310673692.1A CN104697303A (en) | 2013-12-05 | 2013-12-05 | Microwave hot-blast air coupling drying system for acquiring optimal drying curve |
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| CN201310673692.1A CN104697303A (en) | 2013-12-05 | 2013-12-05 | Microwave hot-blast air coupling drying system for acquiring optimal drying curve |
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| CN104697303A true CN104697303A (en) | 2015-06-10 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105231254A (en) * | 2015-09-13 | 2016-01-13 | 常州大学 | Hot-blast air and microwave coupling food drying control system |
| CN108050823A (en) * | 2017-12-11 | 2018-05-18 | 界首市金龙机械设备有限公司 | A kind of grain drying machine intelligent temperature control system |
| CN109059429A (en) * | 2018-09-15 | 2018-12-21 | 乔燕春 | A kind of semiconductor temperature-control micro vacuum freeze drier |
| CN109237868A (en) * | 2018-08-22 | 2019-01-18 | 北京交通大学 | A kind of drying means and system of radioactive waste |
| CN112229171A (en) * | 2020-09-30 | 2021-01-15 | 南京中科药业有限公司 | Microwave vacuum drying device and drying process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581534A (en) * | 2009-06-29 | 2009-11-18 | 温州大学 | Continuous-type microwave hot air combined drying equipment |
| CN201706867U (en) * | 2010-06-30 | 2011-01-12 | 北新集团建材股份有限公司 | Intelligent hot air micro-wave thistle board drying system |
| WO2012045923A1 (en) * | 2010-10-08 | 2012-04-12 | Innovation & Development Company (Idco) | Continuous heat treatment device, in particular for dividing materials, using microwave radiation |
| CN102735042A (en) * | 2012-06-25 | 2012-10-17 | 江南大学 | Hot air microwave coupling device |
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2013
- 2013-12-05 CN CN201310673692.1A patent/CN104697303A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581534A (en) * | 2009-06-29 | 2009-11-18 | 温州大学 | Continuous-type microwave hot air combined drying equipment |
| CN201706867U (en) * | 2010-06-30 | 2011-01-12 | 北新集团建材股份有限公司 | Intelligent hot air micro-wave thistle board drying system |
| WO2012045923A1 (en) * | 2010-10-08 | 2012-04-12 | Innovation & Development Company (Idco) | Continuous heat treatment device, in particular for dividing materials, using microwave radiation |
| CN102735042A (en) * | 2012-06-25 | 2012-10-17 | 江南大学 | Hot air microwave coupling device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105231254A (en) * | 2015-09-13 | 2016-01-13 | 常州大学 | Hot-blast air and microwave coupling food drying control system |
| CN108050823A (en) * | 2017-12-11 | 2018-05-18 | 界首市金龙机械设备有限公司 | A kind of grain drying machine intelligent temperature control system |
| CN109237868A (en) * | 2018-08-22 | 2019-01-18 | 北京交通大学 | A kind of drying means and system of radioactive waste |
| CN109059429A (en) * | 2018-09-15 | 2018-12-21 | 乔燕春 | A kind of semiconductor temperature-control micro vacuum freeze drier |
| CN112229171A (en) * | 2020-09-30 | 2021-01-15 | 南京中科药业有限公司 | Microwave vacuum drying device and drying process thereof |
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