CN1760613A - Method of quickening dehydration by using airflow on surface through microwave under vacuum - Google Patents
Method of quickening dehydration by using airflow on surface through microwave under vacuum Download PDFInfo
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- CN1760613A CN1760613A CN 200510123796 CN200510123796A CN1760613A CN 1760613 A CN1760613 A CN 1760613A CN 200510123796 CN200510123796 CN 200510123796 CN 200510123796 A CN200510123796 A CN 200510123796A CN 1760613 A CN1760613 A CN 1760613A
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Abstract
A method for dewatering surface airflow of vacuum microwave includes utilizing airflow generated by vacuum negative pressure to blow surface of substance to let water be separated from surface of substance quickly and to let water brought in airflow be separated out of vacuum container quickly for achieving quick dewatering result under condition of heating by vacuum microwave .
Description
Technical field
The invention belongs to the low temperature dewatering technical field of drying.It is fresh-keeping to be mainly used in dehydrating of fruit-vegetable food.(can certainly be applied to dehydrating of unclassified stores) such as dehydrating of tobacco leaf and timber
Background technology
In the fresh-keeping field of the dry method of food, because widely used is traditional dryness in the sun and heated-air drying technology, and make most fruit-vegetable food or other animals and plants articles for use, characteristics (being exactly fresh-keeping property) such as utilities such as a large amount of vitamin and the original color and luster of material, local flavor have been lost, so, have only the low temperature dewatering technology (when thermal dehydration the temperature of material itself be lower than Celsius 100 the degree dehydration techniques all be the low temperature dewatering technology), particularly be lower than the dehydration technique of 50 degree temperature Celsius, the effect that reaches fresh-keeping is to greatest extent just arranged.And belong to the vacuum freeze drying technology of low temperature dewatering technical field, because cost, the highly energy-consuming cost of process and the complexity of technology of its manufacturing equipment are greatly limited the extensive utilization of this low temperature dewatering preservation technique.So, be its trend with substitute technology cheaply.And the product quality of vacuum microwave dehydrating technology can be its good substitute technology near the effect of vacuum freeze drying technology.Certainly, vacuum freeze drying technology can not eliminated, because also having its unique character aspect the special material of processing.
Because the physical principle that is directly proportional with the vapourizing temperature of water of air pressure, " heating " water under near the absolute vacuum condition and the temperature that forms the water vapor dehydrating effect are near normal temperature, so vacuum dehydration belongs to the low temperature dewatering technology.Mainly contain far infrared and microwave heating at present, and heating using microwave contrast Far-infrared Heating there are the rapid and uniform characteristics of heating.So the vacuum microwave dehydrating technology is its trend.Certainly, also microwave and Far-infrared Heating mode can be used simultaneously sometimes, to make up for each other's deficiencies and learn from each other.
The vacuum frying technology is the low temperature dewatering technology that heats with liquid medium temperature in the vacuum tank, and this technology has reached large-scale production and products thereof at present extensive sale on market.But the vacuum frying technology has on the normal temperature of being higher than (about 80 degrees centigrade) and complex process and the food product thereof residual oil is arranged, and short shortcoming of shelf-life is arranged, so it is limited to be used for the product processed kind.Directly use the dehydration technique (my the present invention mainly belongs to the technology of the direct mode of heating of this microwave) of heating using microwave then widely applicable without the liquid medium temperature heating condition in the vacuum tank under the vacuum condition.Vacuum microwave low temperature dewatering technology is that the eighties of last century late nineteen eighties just begins the new and high technology developed, is the technology that belongs in the ascendant.This technology also extensively is not used for producing at present on a large scale, and before recent years, this technology of having developed has been claimed by the Boeing of the U.S. and Columbia University, and the U.S. has claimed that this technology has reached the stage of model machine.This background technology data and the inventor's technical data in this respect can be squeezed into keyword " vacuum microwave dehydrating " by professional search website (as " Baidu " or " Goole " search website) on the internet, just can search.
Summary of the invention
1. the weak point of this technology at present has following 2 points:
(1) on the application technology physical principle, the high point of black vacuum in vacuum tank, both below the 80mpa (absolute pressure), though because microwave and far heating break away from outside material hydrone, but, because the air in the vacuum tank under the high point of the black vacuum condition is extremely thin, so hydrone can not be diffused in the space of vacuum tank soon, phenomenon in the surface detention of material is arranged, and this phenomenon has influenced the speed of separating out of the moisture of material inside again.And, because being combined into globule state again easily, the molecular force between hydrone also to rest on material and the vacuum tank wall.For physical phenomenon like this, had a strong impact on the speed of dehydration.Microwave under the simple vacuum condition and Far-infrared Heating, its dewatering time is long, will make dehydrated material characteristics such as original composition, color and luster occur and be subjected to too much destruction, and fresh-keeping property is just poor, also has to make its volume, reconstitution rate reduce too much situation.That is to say, do not reach the best dewatering time of each material that reach.Owing to do not recognize or notice this phenomenon and physical principle these more technical scientific research personnel, and hindered the progress of the maturation of this technology.
(2) should guarantee very high vacuum, need to solve the problem that moisture hightails vacuum tank again.Especially at the large-scale production state, the subject matter that this problem is especially outstanding.In the personnel of this technology of research that has there, recognize that also this is one and demands the technical barrier that will solve urgently, but also have no idea.This is the technical defective that has essence of present vacuum microwave dehydrating, is the jejune sign of this technology.
More than 2 points, also caused the blindness in process equipment invention design.So the equipment of this technology does not in the market solve two above problems basically, thereby its production capacity is subjected to great restriction, has also more influenced the rational development progress on the large-scale production equipment.
Solve above technical barrier, just must be when these two physical conditions of vacuum microwave possess simultaneously, want also to add that how another hightail the method for material and the moisture in the vacuum tank to the moisture that is trapped in the material surface and get rid of physical condition and device outside the vacuum tank rapidly.The conclusion of Take me as I am.
2. characteristics of the present invention will solve and make the moisture that is trapped in the material surface hightail material under vacuum microwave (and far infrared) condition and detach problem outside the vacuum tank, and I have just invented with air-flow and have brushed the method that (being exactly other physical condition) material surface hightails moisture to be stranded in the material surface.Because vavuum pump is also in work, so its air-flow is carried its moisture secretly and also hightailed out outside the vacuum tank thereupon simultaneously.
Personnel for many these technology of research, thinking mistaken ideas are arranged, just have a query: in vacuum tank, put into gas, can this guarantee its vacuum? my answer, though the present invention has " should guarantee that vacuum also will put into the contradiction that air reduces vacuum in vacuum tank ", but, I am in research process, find that material dewatering just can reach rapid dehydration and can make materials quality reach the situation of good quality again with interior at the 80mpa of vacuum (absolute pressure), does not need extra high vacuum.The solution of this contradiction only is need be bigger than the capacity of original vavuum pump.And used throughput is not too big.So, just need and make the air velocity that material surface water effective breaks away from and the minimum value and the capacity equilibrium problem of throughput, from and make vacuum remain on the regulation technology of certain numerical value.This regulation technology has individual independent device to implement.
Two factors of the air-flow that vacuum tank sucks also make some difference to dehydrating effect: the temperature of the first this air-flow in vacuum tank will be higher than corresponding vacuum water vapor temperature, otherwise, the quality of dewatering speed, product and the moisture content of product are had certain influence; It two is that the humidity of this air-flow in vacuum tank is more little, and the moisture content behind the material dewatering is also just more little.
At present this technology and equipment of China contrasts my invention, and most importantly the long deficiency of dewatering time is arranged, basically one hour to four hours or longer (these data are arranged on the internet).And the airflow on surface condition is added in my invention under the vacuum microwave condition, just can make dewatering time shorten to a few minutes to dozens of minutes.Its superiority is: the time of first dehydration greatly shortens, and makes processing power consumption cost reduce a lot; It two is that the quality of material is greatly improved; It three is to make the moisture content of the material after the dehydration lower.
Have only air-flow method of the present invention that " good expansion effect " just arranged.If dewatering time is more than more than one hour, my experimental studies results is: do not had " expanded " effect basically.(annotate: though the vacuum freeze drying technology dewatering time is very long, also having extraordinary expansion effect, is because owing to the moisture in the material that has freezed is to be that gaseous state is deviate from by the crystalline state distillation directly, so the volume of material does not change.Constancy of volume just has " expanded " effect.And, keep original volume basically in the dehydration of the water-containing materials of non-frozen state, and just must dewatering speed fast, thus make volume of material also not have enough time to shrink too many, just finalized the design.) my expansion effect of this invention has just indicated the good characteristics of reconstitution rate, and reconstitution rate is an important feature of fresh-keeping character.So the expansion effect of product is well to have indicated my the present invention and an important difference of existing relevant art.
My the present invention has indicated the relative maturity and the integrity of this technology.My invention also belongs to the original innovation character of basic technology.
The specific embodiment
On the structure of equipment, a special plumbing installation just should be arranged, this pipeline one end opening is exposed to outside the vacuum tank, (this opening need be according to the process equipment characteristics for the other end opening of this pipeline within vacuum tank, different special constructions is arranged) be placed on the surface of material, vacuum condition of negative pressure just can cause air-flow.And the inhomogeneity condition that guarantees the minimum moisture content of product should be that all material surfaces all will evenly be subjected to brushing of same airflow amount and air velocity everywhere.Simultaneously, in the middle of this pipeline, individual choke valve is arranged, regulate the flow and the speed of its air-flow.Simultaneously, in the middle of this pipeline, have and can regulate the heater of temperature, regulate the temperature of its air-flow.
I just applied for that a patent of invention is called " method for negative pressure processing crisp fried soya bean " in 1993, and application number is 93110140.9; Publication number is CN 1091600A.In this application book, used the method.But, clearly do not say so pneumatic dewatering process and concrete implementation content, but, existing vacuum and far-infrared and microwave condition in the method for in " method for negative pressure processing crisp fried soya bean " literary composition, saying, vacuum and time data that the dehydration of saying in this paper is also arranged are understood the air-flow method of having used this paper to say in other words.But, only the method was confined to (annotate: should mainly be the fresh-keeping function of low temperature dewatering on beans expanded originally; In fact, can be applied to most moisture materials.)
In the research process of more than ten years, the inventor has passed through lab scale, pilot scale and model machine stage of large-scale production up till now.Comprising to this The Application of Technology basic technology Study on Theory and discovery, also comprised the invention and the enforcement of technology, also comprised the invention and the enforcement of relevant device.My technology of the present invention is mature on the whole at present.My large-scale production model machine is a drum-type at present, is mainly used in the production of round shaped grain shape material.And the production prototype structure that is applicable to the material of sheet and strip has had inventive concept, but does not also implement.In addition; remind the reader; because the present invention is on principle, in technologic character and characteristics; when design scaleization or continuity large-scale production equipment; the structure of the equipment that it is whole also is special; never be " big jar " structure of existing vacuum microwave dehydrating equipment on the present market, this needs the invention that belongs to utility model character again.I have grasped the principle and the principle of the invention design that designs whole serialization large-scale production equipment; and its target is exactly to reach rapid dehydrating effect to greatest extent and reduce the cost that consumes energy in the process, and reduces the cost of making of equipment and the volume of equipment to greatest extent.
Claims (1)
1. the airflow on surface of a vacuum microwave is accelerated dewatering, it is characterized in that: under the situation that vacuum and these two physical conditions of heating using microwave possess simultaneously, on the structure of equipment, a special plumbing installation is arranged, this pipeline one end opening is exposed to outside the vacuum tank, the other end opening of this pipeline within vacuum tank, this opening need be according to the process equipment characteristics, different special constructions is arranged, be placed on the surface of material, vacuum condition of negative pressure just can cause air-flow, and the inhomogeneity condition that guarantees the minimum moisture content of product should be that all material surfaces all will evenly be subjected to brushing of same airflow amount and air velocity everywhere, and every this special plumbing installation is arranged on vacuum microwave equipment is exactly the substance feature that the present invention will protect; Simultaneously, in the middle of this pipeline, individual choke valve is arranged, regulate the flow and the speed of its air-flow; Simultaneously, in the middle of this pipeline, have and can regulate the heater of temperature, regulate the temperature of its air-flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510123796 CN1760613A (en) | 2005-11-24 | 2005-11-24 | Method of quickening dehydration by using airflow on surface through microwave under vacuum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510123796 CN1760613A (en) | 2005-11-24 | 2005-11-24 | Method of quickening dehydration by using airflow on surface through microwave under vacuum |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102987430A (en) * | 2012-12-06 | 2013-03-27 | 江南大学 | Quick preparation method for conditioning smoked chicken wings based on low-temperature combined drying and medium-short wave infrared roasting |
| CN103940207A (en) * | 2013-08-23 | 2014-07-23 | 太仓市金强家具有限公司 | Unmanned microwave wood drying device |
| CN107183774A (en) * | 2017-07-11 | 2017-09-22 | 唐山天和环保科技股份有限公司 | One grows tobacco materials liquid separating and dehydrating device and separating and dehydrating method |
| CN108613496A (en) * | 2018-05-31 | 2018-10-02 | 成都思达特电器有限公司 | A kind of plane far infrared jet drying assembly line |
-
2005
- 2005-11-24 CN CN 200510123796 patent/CN1760613A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102987430A (en) * | 2012-12-06 | 2013-03-27 | 江南大学 | Quick preparation method for conditioning smoked chicken wings based on low-temperature combined drying and medium-short wave infrared roasting |
| CN103940207A (en) * | 2013-08-23 | 2014-07-23 | 太仓市金强家具有限公司 | Unmanned microwave wood drying device |
| CN103940207B (en) * | 2013-08-23 | 2016-04-13 | 太仓市金强家具有限公司 | Adopt the method for unattended microwave timber drying device desiccated wood |
| CN107183774A (en) * | 2017-07-11 | 2017-09-22 | 唐山天和环保科技股份有限公司 | One grows tobacco materials liquid separating and dehydrating device and separating and dehydrating method |
| CN108613496A (en) * | 2018-05-31 | 2018-10-02 | 成都思达特电器有限公司 | A kind of plane far infrared jet drying assembly line |
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Open date: 20060419 |