CN106949713A - A kind of low area overheat steam heat pump drying device - Google Patents
A kind of low area overheat steam heat pump drying device Download PDFInfo
- Publication number
- CN106949713A CN106949713A CN201710248570.6A CN201710248570A CN106949713A CN 106949713 A CN106949713 A CN 106949713A CN 201710248570 A CN201710248570 A CN 201710248570A CN 106949713 A CN106949713 A CN 106949713A
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- Prior art keywords
- heat pump
- air
- drying
- water
- low area
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- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
-
- 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
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- 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
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
-
- 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
- F26B25/008—Seals, locks, e.g. gas barriers or air curtains, for drying enclosures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/10—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof
Abstract
The invention discloses a kind of low area overheat steam heat pump drying device, including casing, pumped vacuum systems and water system, the box house is divided into heated-air drying space by the first thermal-insulation baffle plate and water vapor condensation separates out space, first thermal-insulation baffle plate is provided with numerical control air door and air inlet fan, the water vapor condensation separates out space and is provided with evaporator and heat pump, and the heated-air drying space is provided with condenser, the second thermal-insulation baffle plate, return air fan and the shelf for placing material.The low area overheat steam heat pump drying device of the present invention, using closed cycle, heat loss can be reduced to the full extent, energy consumption is reduced；Close to vacuum environment, while beneficial to moisture evaporation containing wet stock, it is ensured that the safe operation of source pump；Using drying with superheated steam, speed is fast, safe, quality of finished product good.
Description
Technical field
The present invention relates to drying plant technical field, and in particular to one kind utilizes vacuum technique, drying with superheated steam and sky
Enclosed circulation heat pump drying device of the air supply heat pump under environment under low pressure.
Background technology
Dry the technology for referring to and moisture or other hygroscopic waters being removed from wet stock, be widely used in chemical industry, food, light industry,
Each industrial circles such as weaving, coal, agriculture and forestry product processing and building materials.Its general principle is, at a certain temperature, any aqueous
Wet stock has certain vapour pressure, and when this vapour pressure is more than the water vapor partial pressure in ambient gas, moisture will be vaporized.Vaporization institute
Calorific requirement, or provided from surrounding hot gas, or by other thermals source by radiation, heat transfer.Understand that influence is dry by principles above
The objective condition of dry efficiency has two：One is the water vapor partial pressure in surrounding air, and one is heat.According to the supplier of heat
Formula is different, there is a variety of dry types, such as convective drying, conductive drying, radiant drying, dielectric heating drying etc..Convective drying exists
Most widely used in production, it includes pneumatic conveying drying, spray drying, fluidized drying, revolving drum drying and carriage-type drying etc..Conduction
Drying includes roller drying, freeze-drying, vacuum rake type drying etc..Radiant drying and dielectric heating drying are higher due to cost,
Industrially using less.Above drying means or drying equipment all suffer from a contradiction, i.e. drying efficiency and drying cost is past
Toward being directly proportional, energy consumption cost is also increased while increasing heat supply.Therefore, existing highly effective drying function is developed, again
Can be the important directions of current drying industry technology development with the drying device of energy-conservation of consumption reduction.
The content of the invention
It is an object of the invention to provide a kind of low area overheat steam heat pump drying device, vacuum technique, mistake are made full use of
Heat steam is dried and enclosed circulation of the air source heat pump under environment under low pressure is dried, and realizes the energy-saving and emission-reduction of dry materials process
With it is safe and efficient.
To achieve the above object, the technical scheme is that：
A kind of low area overheat steam heat pump drying device, including closed casing, the pumped vacuum systems that is connected with casing
And water system, wherein：
The box house is divided into heated-air drying space by the first thermal-insulation baffle plate and water vapor condensation separates out space, institute
The first thermal-insulation baffle plate is stated provided with numerical control air door and air inlet fan, the water vapor condensation separates out space and is provided with evaporator and heat
Pump, the heated-air drying space is provided with condenser, the second thermal-insulation baffle plate, return air fan and the shelf for placing material, described
Evaporator, heat pump and condenser form closed-loop path by pipeline；
The shelf, return air fan, condenser constitute first circulation air channel, the shelf, return air fan, numerical control air door,
Evaporator, air inlet fan, condenser constitute second circulation air channel.
The pumped vacuum systems includes setting the vavuum pump of outside the enclosure.Original air in casing is taken out by vavuum pump
Walk, so that oxidation and combustion reaction can not be produced, it is to avoid box house catches fire or exploded.
The water system includes the water intaking valve and water filter being arranged on water supply line.Water enters in vacuum state
Flass can occur after casing, become vapor, the impurity in water is may filter that by water filter, it is to avoid pollution has sterilizing to want
The raw-food material and pharmaceutical raw material asked.
Because the drying device of the present invention does not set exhaust outlet, dry overall process and keep sealing, the vapor in casing will not
Emitted by exhaust outlet, but the condensation in evaporator, therefore to keep long-play, the evaporator is also set
There is the storage tank for storing condensed water.
The low area overheat steam heat pump drying device also includes automatic monitoring unit, the automatic monitoring list
Member includes temperature sensor, humidity sensor, pressure gauge, anemobiagraph and the master controller being located on casing, the master control
Device is electrically connected vavuum pump, water intaking valve, return air fan, numerical control air door, air inlet fan and heat pump.The automatic monitoring list
Member, can monitor and record the change of temperature in drying course, humidity, wind speed and pressure on-line, and drying situation is grasped in real time.
Operationally, the material that need to be dried is put into shelf, closed box to the drying device of the present invention.Vavuum pump is opened, is taken out
Air in outlet body, when box house pressure is close to zero, opens water intaking valve, water enters casing after water filter.
Because being now nearly vacuum state in casing, water occurs flass after entering casing, becomes vapor immediately.When pressure gauge is read
Number (such as can be set as 0.01MPa) when being some value according to material characteristic, close water intaking valve, open return air fan, air intake
Fan and numerical control air door, make vapor in casing internal circulation flow.Then heat pump is started, under the work of heat pump, heated-air drying
The vapor in space is gradually thermally formed superheated vapor by condenser, and the heat that material to be dried now absorbs superheated vapor starts
The moisture of inside is evaporated, moist steam is formed, under the drive of return air fan, a part enters vapor by numerical control air door
Condensation space, then condensed device sends into dried material to another part after heating again.Enter water vapor condensation and separate out sky
Between moist steam, by the condensation of evaporator, condensed water enters storage tank, and the vapor after cooling then passes through air intake wind
Fan enters heated-air drying space.Heated-air drying space and water vapor condensation are separated out space and separated by the first thermal-insulation baffle plate, make two
The temperature and humidity in individual space is different, and the balance of box house temperature and pressure is adjusted by numerical control air door.
Compared with prior art, its advantage is the present invention：
The drying device of the present invention is taken away original air in casing by vavuum pump, adds a small amount of water, forms single
Pure vapor environment under low pressure, whole device does not set exhaust outlet, dries overall process and keeps sealing, the vapor in casing can not be arranged
Go out, form closed cycle, heat loss is reduced to the full extent, reduce energy consumption, environment under low pressure not only improves vapor in material
Evaporation, make it that source pump can be run with high temperature safe, drying with superheated steam speed is fast, safe, quality of finished product good again.
Brief description of the drawings
Fig. 1 is the structure chart of low area overheat steam heat pump drying device of the present invention；
Description of reference numerals：1- return air fans；2- pressure gauges；3- anemobiagraphs；4- numerical control air doors；5- evaporators；6- water storages
Case；7- heat pumps；The thermal-insulation baffle plates of 8- first；9- air inlet fans；10- condensers；11- shelves；12- casings；13- vavuum pumps；14- is filtered
Hydrophone；15- water intaking valves；The thermal-insulation baffle plates of 16- second.
Embodiment
Present disclosure is described in further details with reference to the accompanying drawings and detailed description.
Embodiment：
As shown in figure 1, a kind of low area overheat steam heat pump drying device, including casing 12, casing 12 is connected with vavuum pump
13rd, pressure gauge 2, anemobiagraph 3 and filling pipe, are provided with water intaking valve 15 and water filter 14 on filling pipe.
The heated-air drying space and the right on the left side are divided into inside casing 12 by the first thermal-insulation baffle plate 8 for arranging vertically
Water vapor condensation separates out space.The top of first thermal-insulation baffle plate 8 is provided with numerical control air door 4, and middle part is provided with air inlet fan 9.Vapor is cold
Condensation goes out space provided with evaporator 5 and heat pump 7, and the lower section of evaporator 5 is provided with storage tank 6.Heated-air drying space is provided with condenser
10th, the second thermal-insulation baffle plate 16, return air fan 1 and the shelf 11 for placing material.Evaporator 5, heat pump 7 and condenser 10 pass through
Pipeline formation closed-loop path.
Wherein, evaporator 5, air inlet fan 9 and condenser 10 turned left from the right side and be arranged in parallel vertically successively, are easy to through evaporator
Vapor after 5 processing is directly blown into condenser 10 by air inlet fan 9.Second thermal-insulation baffle plate 16 is horizontally disposed with, and it is right
End and the upper end of condenser 10 connect, and constitute L-type dividing wall, heated-air drying space are divided into two parts, i.e., positioned at second
The lower section of thermal-insulation baffle plate 16, the dry materials region of the left of condenser 10, shelf 11 are placed in this region.And protected positioned at second
The top of temperature dummy plate 16, the L-type passage of the right of condenser 10 are then circulation air path, and return air fan 1 is arranged on the second thermal-insulation baffle plate 16
In the air channel of top, for the vapor in dry materials region to be drawn into circulation air path.
Dotted line and arrow in Fig. 1 show two circulation air paths in casing 12：First circulation air channel is located at hot air drying
In dry space, air-flow flows out from the left upper end of shelf 11, by return air fan 1, is downwardly towards condenser 10, finally passes through to the left
Condenser 10 is returned between shelf 11.Second circulation air channel insertion heated-air drying space and water vapor condensation separate out space, air-flow
Flowed out from the left upper end of shelf 11, by return air fan 1, numerical control air door 10 is flowed to the right, then in turn through evaporator 5, is entered
Wind fan 9, condenser 10 are returned between shelf 11.When the moisture of dried material is fewer, by adjusting numerical control
The aperture of air door 4, reduction is even switched off second circulation air channel, can further reduce energy consumption.
Wherein, low area overheat steam heat pump drying device of the invention, also including master controller, the temperature being located in casing 12
Spend sensor and humidity sensor and master controller (not shown in figure).Wherein, master controller be electrically connected vavuum pump 13,
Water intaking valve 15, return air fan 1, numerical control air door 4, air inlet fan 9 and heat pump 7.Master controller is measured according to temperature sensor
Air speed value that pressure value that humidity value that temperature value, humidity sensor are measured, pressure gauge 2 are measured, anemobiagraph 3 are measured and default
Value, sends work order, its setting is retouched by those skilled in the art according to existing sensing technology and above-mentioned functions to the said equipment
State and can be achieved, therefore be no longer described in detail herein.
By automatic monitoring unit, it can monitor on-line and record temperature in drying course, humidity, wind speed and pressure
Change, grasps drying situation in real time, and by setting certain temperature, humidity value adjust automatically drying program, optimization drying work
Skill, reduces labour's input.
The material that need to be dried operationally, is put into shelf 11, closed box 12 by the drying device of the present invention.Open vacuum
Pump 13, extracts the air in casing 12 out, when the internal pressure of casing 12 is close to zero, opens water intaking valve 15, water is through filter water
Enter casing 12 after device 14.Because being now nearly vacuum state in casing 12, after entering casing 12 flass occurs immediately for water,
Become vapor.When the reading of pressure gauge 2 be some value when (such as 0.01MPa can be set as according to material characteristic), close into
Water valve 15, opens return air fan 1, air inlet fan 9 and numerical control air door 4, makes vapor in the internal circulation flow of casing 12.Then start
Heat pump 7, under the work of heat pump 7, the vapor in heated-air drying space is gradually thermally formed superheated vapor by condenser 10, waits to do
The heat that dry material absorbs superheated vapor starts to evaporate the moisture of inside, forms moist steam, under the drive of return air fan 1,
A part of moist steam enters water vapor condensation by numerical control air door 4 and separates out space, and another part moist steam is then condensed again
Device 10 sends into dry materials region after heating.The moist steam that water vapor condensation separates out space is entered, by the condensation of evaporator 5
Condensed water is separated out, is stored in storage tank, the vapor after cooling then enters heated-air drying space by air inlet fan 9, then
Secondary condensed device 10 sends into dry materials region after heating, so that by the water transport in material to be dried into storage tank 6.
The low area overheat steam heat pump drying device of the present invention, with obvious advantage：
1st, closed cycle can reduce heat loss to the full extent, reduce energy consumption：The drying device of the present invention does not set exhaust outlet,
Dry overall process and keep sealing, the moisture of material to be dried is not discharged with vapor from exhaust outlet, but is condensed by evaporator 5
Separate out, be stored in storage tank 6, therefore, heat will not follow vapor to be discharged to outside casing 12, cause damage.
2nd, environment under low pressure make it that water vapor partial pressure is very low, is conducive to the evaporation of vapor in material：At a certain temperature, it is any
Aqueous wet stock has certain vapour pressure, and when this vapour pressure is more than the water vapor partial pressure in ambient gas, moisture will be vaporized,
This pressure differential is exactly the motive force of the drying process containing wet stock, and pressure differential is bigger, and moisture evaporation speed is faster, therefore, is kept
Environment under low pressure is the important channel for improving evaporation efficiency.The drying device of the present invention will be original in casing 12 by vavuum pump 13
Air is taken away, adds a small amount of water, forms simple vapor, both maintains environment under low pressure, be conducive to containing the water in wet stock
Divide evaporation, convection heat transfer' heat-transfer by convection medium is obtained again, as the necessary condition for starting drying process.
3rd, drying with superheated steam speed is fast, safe, quality of finished product good：The specific heat and ratio of heat transfer coefficient of superheated vapor are empty
Gas is big, while resistance to mass tranfer of the superheated vapor in dried medium is negligible, therefore the migration velocity of moisture is fast, arid cycle
Can substantially it shorten.Drying with superheated steam exists without air, does not aoxidize and combustion reaction, it is to avoid what hothouse caught fire or exploded
It is dangerous.The temperature of drying with superheated steam material is the boiling temperature of water under operating condition, has the food original for sterilizing and requiring drying
Material and pharmaceutical raw material simultaneously, can eliminating bacteria and other harmful microorganisms.The drying device of the present invention, heat pump 7, the and of evaporator 5
Condenser 10 is all in the casing 12 of closing, so the work of heat pump 7 has been completely converted into the heat in casing 12, casing 12
Steam temperature can more and more higher, the less energy is consumed, with regard to superheat state can be reached.
4th, environment under low pressure make it that heat pump can be run with high temperature safe：Conventional air source heat pump is due to being operated in normal atmosphere
Pressure, when heating high-temperature medium, condensation temperature is also very high, and condensing pressure is also larger, and larger condensing pressure causes heat pump machine
Group each several part is significantly improved by the risk destroyed.The heat pump 7 of the present invention works in a low pressure environment, the corresponding vapor of low pressure
Saturation evaporating temperature is relatively low, therefore evaporating temperature is relatively low, in the case where the power output of heat pump 7 is constant, the condensation temperature of working medium
Degree is not also high, therefore condensing pressure declines, and the security of source pump is ensured.
5th, numerical control air door can adjust dry environment parameter：First thermal-insulation baffle plate 8 is cold by heated-air drying space and vapor
Condensation goes out space and separated, and makes the temperature and humidity of two spaces different.Numerical control air door 4 is opened more greatly, will have more juicy to lead to
The condensation of pervaporation device 5, the air pressure in heated-air drying space, temperature, humidity can be reduced, and water vapor condensation separates out the air pressure in space
It can be raised with temperature, rate of drying can be quicker, but the power consumption of heat pump 7 also can be more.Numerical control air door 4 is opened a little less, condensation
Water is produced can be a little less, and the air pressure in heated-air drying space, temperature, humidity can be raised accordingly.Therefore, according to the drying of different material
Technological requirement, by adjusting numerical control air door 4, can be achieved with the regulation to ambient parameter in casing 12, simple in construction effective.
Above-described embodiment is simply to illustrate that the technical concept and feature of the present invention, the purpose is to be to allow in the art
Those of ordinary skill can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all
It is the equivalent change or modification made according to the essence of present invention, should all covers within the scope of the present invention.
Claims (5)
1. a kind of low area overheat steam heat pump drying device, it is characterised in that what is be connected including closed casing, with casing takes out
Vacuum system and water system, wherein：
The box house is divided into heated-air drying space and water vapor condensation by the first thermal-insulation baffle plate and separates out space, and described the
One thermal-insulation baffle plate is provided with numerical control air door and air inlet fan, and the water vapor condensation separates out space and is provided with evaporator and heat pump, institute
Heated-air drying space is stated provided with condenser, the second thermal-insulation baffle plate, return air fan and the shelf for placing material, the evaporation
Device, heat pump and condenser form closed-loop path by pipeline；
The shelf, return air fan, condenser constitute first circulation air channel, the shelf, return air fan, numerical control air door, evaporation
Device, air inlet fan, condenser constitute second circulation air channel.
2. low area overheat steam heat pump drying device according to claim 1, it is characterised in that the pumped vacuum systems bag
Include the vavuum pump that outside the enclosure is set.
3. low area overheat steam heat pump drying device according to claim 1, it is characterised in that the water system includes
It is arranged on water intaking valve and water filter on water supply line.
4. according to any described low area overheat steam heat pump drying devices of claim 1-3, it is characterised in that the evaporator
It is additionally provided with the storage tank for storing condensed water.
5. low area overheat steam heat pump drying device according to claim 4, it is characterised in that also including automatic monitoring
Unit processed, the automatic monitoring unit includes the temperature sensor being located on casing, humidity sensor, pressure gauge, wind speed
Instrument and master controller, the master controller are electrically connected vavuum pump, water intaking valve, return air fan, numerical control air door, air inlet fan
And heat pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710248570.6A CN106949713A (en) | 2017-04-17 | 2017-04-17 | A kind of low area overheat steam heat pump drying device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710248570.6A CN106949713A (en) | 2017-04-17 | 2017-04-17 | A kind of low area overheat steam heat pump drying device |
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| Publication Number | Publication Date |
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| CN106949713A true CN106949713A (en) | 2017-07-14 |
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| CN201710248570.6A Pending CN106949713A (en) | 2017-04-17 | 2017-04-17 | A kind of low area overheat steam heat pump drying device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543333A (en) * | 2017-08-14 | 2018-01-05 | 珠海格力电器股份有限公司 | Analysis of Heat Pump Drying System and its control method |
| CN109237929A (en) * | 2018-08-17 | 2019-01-18 | 佛山市澳霆环境设备制造有限公司 | A kind of efficient heat pump dehumidifier |
| CN111637702A (en) * | 2020-07-04 | 2020-09-08 | 河北工业大学(张北)产业技术研究院 | Steam circulation drying system of solar energy coupling heat pump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543333A (en) * | 2017-08-14 | 2018-01-05 | 珠海格力电器股份有限公司 | Analysis of Heat Pump Drying System and its control method |
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