CN101836674B - Microwave-assisted heating combined belt type drier - Google Patents
Microwave-assisted heating combined belt type drier Download PDFInfo
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- CN101836674B CN101836674B CN2010101611540A CN201010161154A CN101836674B CN 101836674 B CN101836674 B CN 101836674B CN 2010101611540 A CN2010101611540 A CN 2010101611540A CN 201010161154 A CN201010161154 A CN 201010161154A CN 101836674 B CN101836674 B CN 101836674B
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Abstract
The invention relates to a grain-drying machine, in particular to a drier capable of increasing the efficiency of corn dehydration. The purpose of the invention is to solve the problems of conventional drying machines, including long drying time, low drying efficiency and severe pollution. The drier comprises a main drying unit, a natural gas burner, a dehumidifying system and a control system. On the basis of a belt drier, the drier is provided with a microwave-assisted heater and the natural gas burner, and utilizes the heating characteristic of microwave and the cleanliness characteristic of natural gas burning to solve the problems of conventional driers, including long drying time, low drying efficiency and severe pollution.
Description
Technical field
The present invention relates to a kind of corn drying machinery, particularly relate to a kind of microwave-assisted heating combined belt type drier, belong to agricultrue sideline production processing machinery.
Background technology
The characteristics of corn are that the moisture after the results is high, and up to 25%～35%, its seed is big in the north, and epidermis is hard, and the water evaporates difficulty is to be difficult to one of dry grain variety.
The corn kernel dry run can be divided into three phases: predrying stage, constant rate drying period and falling rate drying period.
In the predrying stage, the vaporization of moisture is mainly on the surface of seed, and the water evaporates velocity ratio is very fast, and rate of drying is started from scratch and risen to peak rapidly; At constant rate drying period, moisture finishes at the vaporescence on seed surface, and the speed of its evaporation depends on the speed of internal moisture to diffusion into the surface, and moisture evaporated is pressed straight line basically and descended, and rate of drying is stable basically.This is because the heat that provides to corn basically all is consumed in the water evaporates that shifts with liquid state, at this moment, corn surface moisture evaporation rate no better than the corn internal moisture to the speed of outside diffusion; When corn drying arrived certain moisture, rate of drying slowed down and enters into falling rate drying period, and moisture descends and slows down gradually.
China's corn drying is continued to use rower drier always, and the production capacity of this drying machine is big, and precipitation range is big; But,, reduce drying time, often when drying operation in order to boost productivity because corn moisture is higher; Manage to improve medium temperature, 120 ℃～180 ℃ of general dry-heat air temperature, this will cause the quality of dry back corn to descend, and can only be as commodity food; Can not remake and be other deep processing raw material, nonetheless, drying time is also more than more than 10 hours.
Microwave drying is different from hot blast and other drying mode, because its unique heat characteristic, dry materials speed is fast, the time short, do the back quality and heat utilization efficiency is high, the existing drying that is used for valuable materials such as hill dish, medicinal material more.Come dry corn with microwave merely, because of its cost is high, energy consumption is too big, the price of material own is low again, does not see application in the reality.
Microwave drying power is big more, and temperature raises soon more, and rate of drying is fast more, and shorten total drying time.Later stage, rate of drying descended rapidly along with the minimizing of water content in the corn kernel.But dry power is excessive, is prone to cause temperature of charge too high too fast with rate of drying, is prone to cause that corn kernel coking and quality seriously descend.
Summary of the invention
The traditional drying of corn, falling-rate period accounts for 2/3 of whole drying time drying time, 1/3 of the not enough all moisture of the moisture that evaporates; The object of the present invention is to provide a kind of microwave-assisted heating combined belt type drier, this machine is attempted the constant rate of drying final stage at traditional drying, gets into before the falling-rate periods of drying; Add the microwave assistant heating; Accelerate the speed of internal moisture, can shorten falling-rate period drying time so greatly, shortened whole drying time to the outside diffusion.
Above-mentioned purpose of the present invention realizes that by following scheme accompanying drawings is following:
A kind of microwave-assisted heating combined belt type drier; Mainly form by main drying, neat gas burner, dehumidification system and control system four parts; Described main drying 2 is made up of feeding device, input and output material microwave TVS, drying box and transmission system, and feeding device wherein is positioned at the front end of main drying, and it comprises the layer thickness of a cover loading hopper 5 and a cover adjusting iblet; Make corn evenly be layered on the scalable flashboard on the conveyer belt; Described charging microwave TVS 6 and discharging microwave TVS 9 are positioned at the two ends of drying box, and described drying box is divided into 4 sections that connect successively, and the 1st, 3,4 section is hot air drier 7; Microwave drying oven 8 is positioned at the 2nd section; Hot air drier 7 is through neat gas burner 4 heat supplies, and described dehumidification system adopts 3 pairs of hot air drier 7 air drafts of circulating fan, and material temperature, key point moisture, drying medium temperature, conveyer belt speed, air distribution door open size and conveyer belt speed is controlled by the control system.
The present invention compared with prior art has following technique effect: before getting into falling-rate periods of drying, add the microwave assistant heating, accelerate the speed of internal moisture to the outside diffusion, can shorten falling-rate period drying time so greatly, shortened whole drying time.
Description of drawings
Fig. 1 structural representation of the present invention;
The structural representation of main drying among Fig. 2 the present invention;
Fig. 3 controls system block diagram.
Among the figure: 1. control system 2. main dryings, 3. dehumidification systems, 4. neat gas burners, 5. loading hoppers, 6. charging microwave TVSs, 7. hot air driers, 8. microwave drying ovens, 9. discharging microwave TVSs, 10. transmission systems
The specific embodiment
Further specify particular content of the present invention and embodiment thereof below in conjunction with the accompanying drawing illustrated embodiment.
Described microwave drying oven 8 is made up of microwave heating chamber and microwave source two parts, and microwave heating chamber is an airtight wire chamber around, and two ends link to each other with hot air drier; Conveyer belt passes in the middle, and it (all is to select known products for use, like magnetron: Panasonic 2m167-M1 that microwave source is made up of magnetron, transformer, rectification, waveguide and cooling system; Water-cooled, transformer: beautiful MD-901CMR-1), microwave source is connected the top of heating chamber; Cover with the microwave source outer cover to prevent microwave leakage; Microwave frequency: 2450 ± 10MHz, microwave source general power 30kw, microwave source divide into groups to open as required.
Described hot air drier 7 every joints are with a cover suspended hood, link to each other with wet-emitting blower 3, and hot blast is blown over the grain layer from bottom to top via circulating fan 3, and sucks circulating fan again, and the high drying medium of small amount of humidity is outside dehumidification system discharge machine.
Described charging microwave TVS 6 is that 1/4 wavelength waveguide slot type reactive is leaked the ability TVS with discharging microwave TVS 9, and open height is 0～50mm, control microwave leakage≤5mW/cm
2
Described transmission system is a ribbon conveyer, and it comprises drive roll, idler roller, conveyer belt and carrying roller, and idler roller is installed in the headstock; Drive roll and motor are installed in tailstock; Conveyer belt asks from idler roller and drive roll and passes that carrying roller has also been arranged in the centre, and conveyer belt adopts and is prone to ventilative, resistant to elevated temperatures netted Teflon conveyer belt; Join frequency converter one cover, belt speed is adjustable continuously in 0～1.5m/min scope.
Described neat gas burner 4 gas consumptions are 25m
3/ h, burning back entrained air, leaving air temp is 60 ℃～80 ℃.
Described control system comprises 1 of switch board, infrared material temperature on-line monitoring appearance 1 cover (its digital displaying meter is positioned at control panel) and frequency converter 1 cover (the DELTA brand is used to control belt speed).
Microwave-assisted heating combined belt type drier is made up of four parts, comprises main drying, neat gas burner, dehumidification system and control system.Consult Fig. 1: control system 1; Through components and parts such as switch board, PLC control panel and sensors; Main material temperature, key point moisture, detection and control drying medium temperature and the conveyer belt speed of detecting, control air distribution door is opened size, finally reaches the purpose of controlling out machine grain moisture.Main drying 2 is made up of feeding device, input and output material microwave TVS, microwave drying oven, hot air drier and transmission system.Consult Fig. 2: the feeding device and the conveying headstock, charging microwave TVS 6, hot air drier 7,8,2 sections hot air driers of microwave drying oven, discharging microwave TVS 9 and conveying tailstock link together by said sequence; Idler roller is installed in the headstock; Drive roll and motor are installed in tailstock; Conveyer belt asks from idler roller and drive roll and passes that carrying roller has also been arranged in the centre.The every joint of hot air drier is with a cover suspended hood, links to each other with wet-emitting blower, and hot blast is blown over netted conveyer belt from bottom to top via circulating fan, and sucks circulating fan again, and the high drying medium of small amount of humidity is outside dehumidification system discharge machine.Part 3 is a dehumidification system, comprises wet-emitting blower, hydrofuge airduct and damper, and the hydrofuge airduct is connected on 3 sections hot air driers.Part 4 is a neat gas burner, Tangshan city Jinsha industry and trade Co., Ltd product, and model is GDN20, carries air blast, the neat gas burner gas consumption is 25m
3/ h, burning back entrained air guarantees that medium temperature is about 70 ℃, sends into circulating fan.
In when operation, at first order ON cycle blower fan, ribbon conveyer, neat gas burner, the aperture of control cold-air flap; When the wind-warm syndrome of waiting to get into dryer reaches 70 ℃, the control belt speed and on the dryer grain inlet grain, open moisture-eliminating blower then; When grain arrival is dried the 2nd section, open the microwave assisted heating device, detect through moisture on-line; In time feedback is controlled belt speed automatically through setting program, and finally reaching grain, to go out machine moisture be between 14%～14.5%.
Claims (4)
1. microwave-assisted heating combined belt type drier; Mainly be made up of main drying, neat gas burner, dehumidification system and control system four parts, described main drying (2) is made up of feeding device, input and output material microwave TVS, drying box and transmission system, and feeding device wherein is positioned at the front end of main drying; It comprises the layer thickness of a cover loading hopper (5) and a cover adjusting iblet; Make corn evenly be layered on the scalable flashboard on the conveyer belt, described charging microwave TVS (6) and discharging microwave TVS (9) are positioned at the two ends of drying box, it is characterized in that; Described drying box is divided into 4 sections that connect successively; 1st, 3,4 sections is hot air drier (7), and microwave drying oven (8) is positioned at the 2nd section, and hot air drier (7) is through neat gas burner (4) heat supply; Described dehumidification system (3) adopts circulating fan to hot air drier (7) air draft, and material temperature, key point moisture, drying medium temperature, conveyer belt speed, air distribution door open size and conveyer belt speed is controlled by the control system; The every joint of described hot air drier (7) is with a cover suspended hood, links to each other with dehumidification system (3), and hot blast is blown over the grain layer from bottom to top via circulating fan, and sucks circulating fan again, and the high drying medium of small amount of humidity is outside dehumidification system discharge machine;
The microwave frequency of described microwave drying oven (8) is 2450 ± 10MHz, and the microwave source general power is 30kw, and microwave source divides into groups to open as required;
The gas consumption of described neat gas burner (4) is 25m
3/ h, burning back entrained air, leaving air temp is 60 ℃～80 ℃.
2. microwave-assisted heating combined belt type drier according to claim 1; It is characterized in that described microwave drying oven (8) is made up of microwave source two parts of microwave heating chamber and apolegamy, microwave heating chamber is an airtight wire chamber around; Two ends link to each other with hot air drier; Conveyer belt passes in the middle, and microwave source is connected the top of heating chamber, covers with the microwave source outer cover to prevent microwave leakage.
3. microwave-assisted heating combined belt type drier according to claim 1; It is characterized in that; Described charging microwave TVS (6) and discharging microwave TVS (9) are that 1/4 wavelength waveguide slot type reactive is leaked the ability TVS, and open height is 0～50mm, control microwave leakage≤5mW/cm
2
4. microwave-assisted heating combined belt type drier according to claim 1 is characterized in that, described transmission system is a ribbon conveyer; It comprises drive roll, idler roller, conveyer belt and carrying roller; Idler roller is installed on the headstock, and drive roll and motor are installed on the tailstock, and conveyer belt passes between idler roller and drive roll; Carrying roller has also been arranged in the centre; Conveyer belt adopts and is prone to ventilative, resistant to elevated temperatures netted Teflon conveyer belt, joins frequency converter one cover, and belt speed is adjustable continuously in 0～1.5m/min scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101611540A CN101836674B (en) | 2010-05-04 | 2010-05-04 | Microwave-assisted heating combined belt type drier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101611540A CN101836674B (en) | 2010-05-04 | 2010-05-04 | Microwave-assisted heating combined belt type drier |
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| Publication Number | Publication Date |
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| CN101836674A CN101836674A (en) | 2010-09-22 |
| CN101836674B true CN101836674B (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101611540A Expired - Fee Related CN101836674B (en) | 2010-05-04 | 2010-05-04 | Microwave-assisted heating combined belt type drier |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103420164A (en) * | 2013-08-29 | 2013-12-04 | 南昌光明化验设备有限公司 | Conveying device with drying function |
| CN104422268B (en) * | 2013-09-10 | 2017-03-15 | 北新集团建材股份有限公司 | A kind of dry kiln temperature control equipment and method |
| CN103564042A (en) * | 2013-11-27 | 2014-02-12 | 刘国辉 | Grain drying system employing high-voltage electricity to accumulate heat, and drying method of grain drying system |
| CN103947749B (en) * | 2014-05-19 | 2015-09-09 | 山东理工大学 | Infrared corncob stage drying technique |
| CN104957237A (en) * | 2015-07-03 | 2015-10-07 | 江苏长寿集团股份有限公司 | Food drying system |
| CN105115280A (en) * | 2015-08-31 | 2015-12-02 | 上海华宇药业有限公司 | Traditional Chinese medicine drying device |
| CN108168273A (en) * | 2017-12-28 | 2018-06-15 | 贺州智桂生物科技有限公司 | Continuous microwave drier |
| CN110285655A (en) * | 2019-07-23 | 2019-09-27 | 南京晓庄学院 | A kind of Hericium erinaceus drying system and method that pulsed microwave is hot air combined |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2365616Y (en) * | 1999-03-18 | 2000-02-23 | 姚晓东 | Continuous microwave drying machine for grains |
| CN100395498C (en) * | 2006-01-13 | 2008-06-18 | 清华大学 | Apparatus for processing grain using microwave energy |
| CN201096446Y (en) * | 2007-08-03 | 2008-08-06 | 霸州市华益科技发展有限公司 | Continuous type microwave material drying-machine |
| CN101278716A (en) * | 2008-05-06 | 2008-10-08 | 华南农业大学 | Method for processing germinating rice |
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Granted publication date: 20120523 Termination date: 20130504 |