CN1130938A - Drying process - Google Patents

Drying process Download PDF

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Publication number
CN1130938A
CN1130938A CN95190677A CN95190677A CN1130938A CN 1130938 A CN1130938 A CN 1130938A CN 95190677 A CN95190677 A CN 95190677A CN 95190677 A CN95190677 A CN 95190677A CN 1130938 A CN1130938 A CN 1130938A
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CN
China
Prior art keywords
air
heat exchanger
warm
rotary type
product
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.)
Pending
Application number
CN95190677A
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Chinese (zh)
Inventor
P·康斯坦丁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PJC AIRCONDITIONING MANUFACTURERS Pty Ltd
Original Assignee
PJC AIRCONDITIONING MANUFACTURERS Pty Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PJC AIRCONDITIONING MANUFACTURERS Pty Ltd filed Critical PJC AIRCONDITIONING MANUFACTURERS Pty Ltd
Publication of CN1130938A publication Critical patent/CN1130938A/en
Pending legal-status Critical Current

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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
    • F26B3/343—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 in combination with convection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

A drying process which has particular applicability to, but is not restricted to, foodstuffs which comprises the steps of: (1) warming ambient air; (2) passing the warmed ambient air to a primary heat exchanger coupled with a dehumidifier where it is cooled, water removed and then reheated; (3) passing the warm dry air produced by step (2) to a heat reclaim coil wherein the temperature of the air is increased and the relative humidity decreased; (4) passing the hot dry air produced by step (3) over or through a product for a sufficient time to achieve the desired drying effect; and (5) venting the warm moist air produced by step (4) to the atmosphere.

Description

Drying means
Invention field
The present invention relates to a kind of drying means, it is specially adapted to food, but is not limited to food.
Background of invention
In this manual, use " drying " this term, and need not " dewater "." dehydration " speech is used for the food drying aspect sometimes." dehydration " contains and removes moisture simultaneously with the meaning of chemical change.
Make a lot of materials as you know, comprise this part thing of medicine, biomaterial and food drying.Drying technique comprises making with several grams per hour to the friction speed of a lot of tons with a drying device and evaporates.Baking temperature can change between 10 ℃ to 70 ℃ medicine, biomaterial and food according to the technology difference that is adopted.The size of drying device can be from little cupboard to big drying tower.The material that is dried also comes in every shape, and can be weak solution, suspension, thin pulp, ointment, granular materials, diffusing stacking yard product, fiber or plate object.Drying can realize with methods such as heat convection, area of heating surface heat conduction, radiation and dielectric heating.
Target of the present invention is that a kind of drying technique will be provided, and it is specially adapted to food, but is not limited to food, and it has improved efficient than it known technology, but does not damage the material that is dried.
Brief summary of the invention
The invention provides a kind of drying means, it is specially adapted to food, but is not limited to food, and it comprises the following steps:
(1) outside air is heated up;
(2) outside air that warms is sent into the primary heat exchanger that links to each other with a drier, air this be cooled, dewatering then reheats;
(3) the warm dry air that generates is sent into the recuperation of heat coil pipe in step (2), raise and relative humidity reduces in the temperature of this air;
(4) the hot dry air that generates in step (3) is blown over or pass the product long enough time, with the drying effect that obtains to require; And
(5) warm-humid air that generates is entered atmosphere in step (4).
The present invention also provides a cover to realize the device of the inventive method.
The accompanying drawing summary
Three description of drawings embodiments of the invention are arranged:
Fig. 1 is for realizing the cross-sectional view of apparatus of the present invention;
Fig. 2 is the sketch map of secondary heat exchanger and relevant device;
Fig. 3 is the part of apparatus of the present invention---the swiveling wheel heat exchanger face sketch map.
Detailed Description Of The Invention
The outside air that uses in step (1) can be to utilize the warm-humid air of sending into step (5) to rise excess temperature by heat exchange in secondary heat exchanger.The result who does like this obtains the high warm outside air of relative humidity.
About step (2), primary heat exchanger is one easily and is positioned near the rotary type heat exchanger of drier, here, warm outside air enters and passes the part of primary heat exchanger whirligig, be cooled at this, pass drier, be removed moisture at this, enter another part of primary heat exchanger whirligig then, obtain heat at this.Developing such drier is for continuous dry air can be provided.
In step (4), product can be loosing heap state or with to a certain degree broken state, or be dried with the pulverizing state.Product can be taken a sample to check constantly, and whether watch drying enough.
From the warm-humid air that step (4) is come out, can there be certain ratio to be admitted to primary heat exchanger, to mix with the air that enters from the external world.
Technology of the present invention can be with for example coming volatilised liq from 2～5 grams per hour to 4 tons of speed that do not wait.Rely on the load and the size increase of device just can remove relatively large liquid.
Baking temperature can change between 10 ° to 70 ℃ by the purposes difference.
According to technology of the present invention and device, typical power is input as 10～120kWh.
Besides rotary type heat exchanger, the air that enters is the bottom by rotary type heat exchanger, fully reduces its temperature at this, to enable to pass through evaporator coil.This evaporator coil further reduces the temperature of air to remove moisture.Resulting then cold air returns the top of rotary type heat exchanger, is heated up into warm dry air at this.
Can in evaporator coil, reclaim heat and it is sent into the recuperation of heat coil pipe.The warm dry air that comes out from the rotary type heat exchanger top can be sent into the recuperation of heat coil pipe, is heated at this and generates hot dry air in order to dry products.
Product can with electromagnetic wave handle so that water transport to product surface.The electromagnetic wave that is suitable for is microwave or radio frequency electromagnetic.Infrared waves can use, but are not best.
The present invention is effective especially aspect the control bacterial growth.Why effective this control is, consider that one of its reason is that the variations in temperature of air stream is rapid, and this can disturb the metabolism of bacterium.For example, may be warmed up to 40 ℃ in 20 ℃ the outside air heat exchanger outside.It may be cooled to for example 15 ℃ in the bottom of rotary type heat exchanger then, and drops to for example 10 ℃ in evaporator coil again.This cold air may be heated to for example 50 ℃ at the top of rotary type heat exchanger subsequently.This heated air may be further heated for example 70 ℃ then in the recuperation of heat coil pipe, and then sends in the product that is dried.At last, this warm air that is full of steam is admitted to for example heat exchanger of outside.This heat exchanger for example is cooled to 25 ℃ to this air from 50 ℃, enters atmosphere then.
See accompanying drawing again, external structure 10 is cladding the each several part of device of the present invention, describes various piece in proper order below with reference to the air draught direction.Numeral 11 indications are the air intake air channel, and it leads to the rotary type heat exchanger 12 that is positioned at external structure 10 1 ends down.Rotary type heat exchanger is divided into bottom 12A and top 12B.The outside air that has heated up is walked downwards by inlet air channel 11, and mixes mutually with a certain proportion of warm air that is full of steam of coming from the product that is dried.At the bottom of rotary type heat exchanger 12A the heat in the mixing air is siphoned away and to be admitted to top 12B then.
Cooled air is admitted to evaporation coil 13, removes moisture at this.Evaporation coil 13 is positioned near the bottom of ancillary chamber 14.Further cooled air is reflected by the rear portion from ancillary chamber 14, flows through on the top of evaporation coil 13, passes the top 12B of rotary type heat exchanger then.After this heated air makes progress away, guided by baffle plate 15, enters air channel, the top 15A of the horizontal direction that is positioned at external structure 10 tops.
Among air channel, the top 15A of horizontal direction first blower fan 16 is arranged.Heated air is passed the recuperation of heat coil pipe 17 and second blower fan 18 by 16 pressurizations of first blower fan.At this moment hot-air passes the down diffluence of vertical air channel 18A that is positioned at external structure 10 1 ends, heat exchanger 12 far-ends.
Hot-air is from vertical air channel 18A outflow and enter inner room 19, and the top conveyer 20 that has a right-to-left to carry in the inner room is seen accompanying drawing.The 3rd blower fan 18B pressurization that part air-flow is installed in the bottom is blown into inner room 19.Below top conveyer 20, a bottom conveyer 21 of carrying is from left to right arranged, to top conveyer 20 in order to carry the product of coming to return again.Hot-air is blown over and/or is passed product on the top conveyer 20.
Subsequently, be full of thermal air current air channel 23 in downward-sloping air channel 22 and top of steam.The a part of warm air that is full of steam of slope air course 22 guiding enters the bottom 12A of rotary type heat exchanger 12.The warm air that is full of steam of 23 guiding in interior air channel remainder passes the first filter 23A and flows to outlet air channel 24.Should be pointed out that as heaters such as microwave equipments and can be installed on the framework in interior air channel 23.
Numeral 25 refers to the control thermal bypass that links to each other with recuperation of heat coil pipe 17, and it is positioned at the outside of external structure 10.The purpose of this covering device is that the unnecessary heat in the recuperation of heat coil pipe is entered atmosphere.
See Fig. 2 again,, pass second filter 31 and be supplied to external heat exchanger 30 from the warm air that is full of steam that comes out of outlet air channel 24.Cold air returns atmosphere by first exhaust fan 32.The outside air that enters passes the 3rd filter 33 and enters heat exchanger 30.Heated air flows into second exhaust fan 34 then again by heat(ing) coil 35, and it receives certain heat from recuperation of heat coil pipe 17.After this Nuan outside air enters inlet air channel 11.
See Fig. 3 again, numeral 12,12A, 12B refer to above-mentioned same set of device.Numeral 40 refers to the bottom 12A of rotary type heat exchanger 12 and the dividing plate between the 12B of top.Numeral 41 and 42 refers to the arrow of warm outside air airflow direction when entering bottom 12A.Numeral 43 refers to the airflow direction of the hot-air that comes out from top 12B.At last, numeral 44 refers to the rotation direction of wheel, and wheel is the main action part of rotary type heat exchanger 12.

Claims (11)

1. be specially adapted to food, but be not limited to the drying means of food, it comprises the following steps:
(1) outside air is heated up;
(2) outside air that warms is sent into the primary heat exchanger that links to each other with a drier, air is cooled, dewaters at this, then reheats;
(3) the warm dry air that generates is sent into the recuperation of heat coil pipe in step (2), raise and relative humidity reduces in the temperature of this air;
(4) the hot dry air that generates in step (3) is blown over or pass the product long enough time, with the drying effect that obtains to require; And
(5) warm-humid air that generates is entered atmosphere in step (4).
2. the process of claim 1 wherein that the used outside air of step (1) relies on heat exchange to heat up with the warm-humid air of sending into step (5) in secondary heat exchanger.
3. the method for claim 1, wherein the primary heat exchanger of step (2) is a rotary type heat exchanger easily, it is positioned near the drier, warm outside air enters and passes the part of primary heat exchanger whirligig and be cooled at this, pass drier and be removed moisture, enter another part of primary heat exchanger whirligig then, obtain heat at this.
4. the process of claim 1 wherein product in step (4) can loose heap state, broken state to a certain degree, or be dried with the pulverizing state.
5. the process of claim 1 wherein and can have the warm-humid air that from step (4), comes out certain proportion to send into primary heat exchanger and mix with the outside air that enters.
6. the process of claim 1 wherein that baking temperature can change according to the purposes difference between 10 ° to 70 ℃.
7. realize the device of the method for claim 1.
8. the device of claim 7, wherein in rotary type heat exchanger, the air that enters is the bottom by rotary type heat exchanger, temperature at this air drops to the degree that is enough to send into evaporator coil, then evaporator coil further reduces the temperature of air to remove moisture, then the cold air that forms is sent back to the top of rotary type heat exchanger, generate warm dry air in this intensification.
9. the device of claim 8, wherein heat is recovered and is admitted to the recuperation of heat coil pipe from evaporator coil.
10. the device of claim 9, wherein the warm dry air that comes out from the rotary type heat exchanger top is admitted to the recuperation of heat coil pipe, is heated at this and generates hot dry air, then can be in order to dry products.
11. the device of claim 7, it comprises the equipment with the electromagnetic wave treatment product, in order to the water transport of product is arrived the surface.
CN95190677A 1994-05-31 1995-05-31 Drying process Pending CN1130938A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM6017A AUPM601794A0 (en) 1994-05-31 1994-05-31 Drying process
AUPM6017 1994-05-31

Publications (1)

Publication Number Publication Date
CN1130938A true CN1130938A (en) 1996-09-11

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ID=3780591

Family Applications (1)

Application Number Title Priority Date Filing Date
CN95190677A Pending CN1130938A (en) 1994-05-31 1995-05-31 Drying process

Country Status (6)

Country Link
EP (1) EP0711394A4 (en)
CN (1) CN1130938A (en)
AU (1) AUPM601794A0 (en)
BR (1) BR9505498A (en)
NZ (1) NZ285997A (en)
WO (1) WO1995033169A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107036398A (en) * 2017-06-09 2017-08-11 重庆光全节能科技有限公司 A kind of energy free dehumidifying heated baking system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPO705697A0 (en) 1997-05-28 1997-06-19 Australian Rural Dehydration Enterprise Pty Ltd Dehydration plant
WO2007062180A1 (en) * 2005-11-23 2007-05-31 The Sherwin-Williams Company System and method to control energy input to a material
US8371038B2 (en) * 2007-11-30 2013-02-12 Certainteed Gypsum, Inc. Method for the use of heat energy from gasification sources in gypsum board production
US10473397B2 (en) 2008-11-25 2019-11-12 Certainteed Gypsum, Inc. Method for the use of heat energy from gasification sources in gypsum board production
CN103822455A (en) * 2014-02-21 2014-05-28 泰山石膏股份有限公司 Heat recovery system of gypsum board drying exhaust steam filling tower

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Publication number Priority date Publication date Assignee Title
US4043051A (en) * 1975-02-24 1977-08-23 Delbert Lussenden Method and apparatus for drying grain
GB1560545A (en) * 1975-07-31 1980-02-06 Buehler Ag Geb Method for drying pasta prducts and apparatus for bulk material tretment
DE2646903C2 (en) * 1976-10-18 1985-03-21 Hans 4600 Dortmund Baltes Method for drying flat goods and drying cabinet for carrying out this method
US4145820A (en) * 1977-08-10 1979-03-27 Npi Corporation Moisture remover for produce
DE2902369A1 (en) * 1979-01-22 1980-08-07 Happel Kg Wood drying chamber operated as heat pump - has inlet air divided into main flow and by=pass flow for precooler
DE2929707C2 (en) * 1979-07-21 1984-08-09 Kraftanlagen Ag, 6900 Heidelberg Method and device for hot air drying, in particular drying treatment of green malt
US4324052A (en) * 1980-09-05 1982-04-13 Bosher John L Solvent and heat recovery system for drying oven
US4534118A (en) * 1982-08-30 1985-08-13 Sun-Flo International, Inc. Solar-assisted mobile food dehydrator
JPS5981488A (en) * 1982-11-02 1984-05-11 株式会社省熱学研究所 Drying system by refrigerator and heat exchanger
ATE34458T1 (en) * 1983-12-19 1988-06-15 Micro Rayonnements Sa METHOD AND DEVICE FOR DRYING WET GOODS, ESPECIALLY CLAY MIXTURES.
US4603489A (en) * 1984-10-05 1986-08-05 Michael Goldberg Heat pump closed loop drying
US4974337A (en) * 1989-10-30 1990-12-04 The Conair Group, Inc. Apparatus and method of drying and dehumidifying plastic
GB2259843B (en) * 1991-09-27 1995-06-14 Ind Tech Res Inst A process for producing tea

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107036398A (en) * 2017-06-09 2017-08-11 重庆光全节能科技有限公司 A kind of energy free dehumidifying heated baking system

Also Published As

Publication number Publication date
EP0711394A4 (en) 1998-04-01
BR9505498A (en) 1996-04-23
WO1995033169A1 (en) 1995-12-07
EP0711394A1 (en) 1996-05-15
NZ285997A (en) 1998-04-27
AUPM601794A0 (en) 1994-06-23

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