CN110686502B - Hot air drying system and method for heat recovery by taking heat pump as heat source - Google Patents
Hot air drying system and method for heat recovery by taking heat pump as heat source Download PDFInfo
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- CN110686502B CN110686502B CN201910938210.8A CN201910938210A CN110686502B CN 110686502 B CN110686502 B CN 110686502B CN 201910938210 A CN201910938210 A CN 201910938210A CN 110686502 B CN110686502 B CN 110686502B
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- 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
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
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- 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
- F26B21/003—Supply-air or gas filters
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- 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
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- 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
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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
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a hot air drying system and a drying method for heat recovery by taking a heat pump as a heat source, wherein the heat in exhaust air of a drying system is recovered on the basis of taking the heat pump as the heat source of the hot air drying system; the fresh air inlet, the condenser, the fan II and the material dryer are sequentially connected through a fresh air pipeline; the fresh air is heated by a heat pump condenser under the action of a fan II and enters a material dryer; the material dryer is connected with an air inlet of the cyclone dust collector through an exhaust air pipe, an air outlet of the cyclone dust collector is connected with an air inlet of the electrostatic dust collector through an air pipe, an air outlet of the electrostatic dust collector is connected with an air inlet of an air chamber through an air pipe, and a finless light pipe type heat exchanger of the heat pump system is arranged in the air chamber; the exhaust air enters the air chamber after two-stage dust removal, exchanges heat with the finless light tube type heat exchanger and is discharged, so that the heat recovery of the exhaust air is realized. The invention uses multistage dust removal to purify exhaust air, and simultaneously uses the heat pump as a drying heat source to recover heat from the exhaust air, thereby realizing energy-saving and high-efficiency drying.
Description
Technical Field
The present invention relates to a drying system, and more particularly, to a hot air drying system and a drying method for recovering heat by using a heat pump as a heat source.
Background
Hot air drying is widely used in various fields such as agriculture, engineering, chemistry, medicine and the like, and the working mechanism is hot air convection, and the heat energy generated by a heat source is convectively transmitted to the outer layer of the wet material contacted with the hot air convection in the form of hot air, then transmitted to the inner layer through the outer layer, and finally the moisture of the material is evaporated.
At present, hot air drying is used for treating materials with higher moisture content such as grains, fermentation residues, wet solid wastes and the like, and at the moment, the energy consumption of a drying system is huge. On the other hand, because the dust content in the exhaust is large, ash blockage is easy to occur when the heat exchanger is directly used for recovering the heat in the exhaust, and finally, a large amount of high-temperature and high-humidity gas with rich heat energy is discharged from the outlet of the drying system, so that the heat recovery is not carried out, and the gas is directly discharged into the atmospheric environment, thereby not only causing energy waste, but also polluting the environment.
With the development and utilization of heat pump technology, heat pumps are applied to drying systems as heat sources, enabling energy consumption to be reduced. The heat pump can consume a part of high-grade energy through the reverse Carnot cycle, absorb heat energy from the surrounding environment, and release the heat energy to the working medium to be heated together with the heat energy converted from the consumed high-grade energy.
Patent CN208532590U shows a drum drying system with a heat pump as a heat source. High-temperature drying air is generated through the heat pump, the drying air is conveyed into the cylinder body of the roller dryer, and convection heat and mass transfer between materials and hot air is realized through rotation of the cylinder body, so that drying is realized. Although the heat pump is used as a heat source of the hot air drying system, the heat in the exhaust air cannot be recovered, so that the waste of the exhaust air heat is caused.
Patent CN110186272a shows a heat pump drying device. High-temperature drying air is generated by the heat pump for the drying system, and heat in exhaust air is recovered by the heat recoverer. Although the heat pump is used as a heat source of the drying system and is used for recovering heat in exhaust air, fine particles in the exhaust air can not be effectively removed only by primary dust removal due to the fact that the exhaust air dust content of the drying system is large, and in the long-term use process, the fine particles are easy to adhere to the surface of a heat exchanger of the heat recovery device, so that the heat resistance is increased, the efficiency of the heat recovery device is reduced, and meanwhile, ash blocking is easy to occur.
Therefore, an energy-saving and high-efficiency hot air drying device capable of effectively recovering heat in exhaust air is lacking at present.
Disclosure of Invention
The invention aims to provide a hot air drying system taking a heat pump as a heat source and performing heat recovery, which solves the problem of high energy consumption of the traditional hot air drying system and simultaneously solves the problem of low heat exchange capacity of an evaporator caused by high dust content and ash blockage when the traditional hot air drying system circularly utilizes exhaust air.
In order to achieve the above purpose, the present invention proposes the following technical scheme:
a hot air drying system which takes a heat pump as a heat source and can carry out heat recovery is designed, and the hot air drying system comprises a heat pump system, a drying system and a multistage dust removal system; on one hand, air enters from a drying system, after the material to be dried in the drying system is dried, the air is discharged from an outlet of the drying system and sequentially enters into a cyclone dust collector and an electrostatic dust collector in a multi-stage dust collection system for dust collection, and the air is discharged from an outlet of the electrostatic dust collector to form exhaust air and enters into an air chamber after the final stage dust collection of the electrostatic dust collector is completed, and finally is discharged outwards from the air chamber. On the other hand, the refrigerant circulates in the heat pump system, absorbs heat in the external environment through the finned tube heat exchanger, absorbs heat in exhaust air through the finless light tube heat exchanger, and after being compressed by the compressor, the refrigerant exchanges heat with air entering the drying system through the condenser, the air enters the drying system for material drying after absorbing heat, and flows into the finned tube heat exchanger for absorbing heat again after releasing heat of the refrigerant, and the refrigerant circulates in a reciprocating manner.
Specifically, the heat pump system comprises an air chamber, a finless light pipe type heat exchanger is arranged in the air chamber, an outlet of the finless light pipe type heat exchanger is connected with a compressor, an outlet of the compressor is connected with a condenser, an outlet of the condenser is connected with an expansion valve, an outlet of the expansion valve is connected with a finned pipe heat exchanger, an outlet of the finned pipe heat exchanger is connected with an inlet of the finless light pipe type heat exchanger, and the finless light pipe type heat exchanger, the compressor, the condenser, the expansion valve and the finned pipe heat exchanger are sequentially connected through refrigerant pipelines to form a closed heat pump system. The heat exchange between the refrigerant and the air in the environment is carried out through the finned tube heat exchanger, the contact area between the heat exchanger and the ambient air is increased, the heat exchange capacity between the heat exchanger and the ambient air is improved, the refrigerant absorbs heat, flows into the finless light tube heat exchanger, carries out heat exchange with exhaust air through the finless light tube heat exchanger, can reduce the influence of residual dust in the exhaust air on the heat exchange of the finless light tube heat exchanger, is beneficial to drainage of condensation water, and is vaporized after the refrigerant absorbs heat through the finless light tube heat exchanger and the finned tube heat exchanger and is sucked into the compressor; the compressor compresses low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is sent into the condenser, and the refrigerant transfers heat to fresh air sucked into the fresh air pipeline by the fan through the condenser; the refrigerant is released from gaseous condensation and flows into the expansion valve, the liquid refrigerant is throttled and cooled by the expansion valve and then flows into the finned tube heat exchanger again, the refrigerant is repeatedly circulated in this way, and the heat in the ambient air and exhaust air is continuously sent into fresh air. Compared with the prior art that the drying effect can be influenced by the exhaust of all circulating utilization of high humidity of exhaust air, the two-stage heat exchanger is adopted in the heat pump system, so that on one hand, the heat in the exhaust air is absorbed, but the high humidity exhaust air after heat release can be discharged out of the drying system, the drying effect of fresh air in the drying system can not be influenced, on the other hand, the heat in the air is absorbed, the heat absorption efficiency of the heat pump is improved, the stability of the drying system is ensured, and the energy consumption of the drying system to electricity is greatly reduced.
The drying system comprises a fresh air pipeline and a material dryer, wherein one end of the fresh air pipeline is connected with a fresh air inlet, the other end of the fresh air pipeline is connected with an air inlet of the material dryer, a condenser is arranged in one end, close to the fresh air inlet, of the fresh air pipeline, and a fan II is arranged in one end, close to the air inlet of the material dryer, of the fresh air pipeline; fresh air enters a fresh air pipeline from a fresh air inlet under the action of a fan II, exchanges heat with a condenser, and enters a material dryer through an air inlet of the material dryer after absorbing heat.
The multi-stage dust removal system comprises a cyclone dust collector and an electrostatic dust collector, wherein an air inlet of the cyclone dust collector is connected with an air outlet of a material dryer in the drying system through an air pipe, an air outlet of the cyclone dust collector is connected with an air inlet of the electrostatic dust collector through an air pipe, and an air outlet of the electrostatic dust collector is connected with an air inlet of an air chamber through an air pipe. The air after drying in the material dryer is discharged through an air outlet of the material dryer and then enters the cyclone dust collector through an air pipe, the cyclone dust collector is discharged from the air outlet of the cyclone dust collector after primary dust removal and enters the electrostatic dust collector through the air pipe, the discharged air is discharged from the air outlet of the electrostatic dust collector after secondary dust removal in the electrostatic dust collector, enters the air chamber through the air pipe, exchanges heat with the finless light pipe type heat exchanger, and the discharged air with high temperature and high humidity transfers heat to the refrigerant in the finless light pipe type heat exchanger and then is discharged from the air chamber.
Further, a hot air drying system which can perform heat recovery by taking a heat pump as a heat source is designed, and the electrostatic precipitator is a wet electrostatic precipitator; the wet electrostatic dust collector comprises an electrostatic dust collector shell, a corona electrode, a dust collecting electrode and a steam nozzle, wherein one end of the electrostatic dust collector shell is connected with an air inlet of the electrostatic dust collector, and the other end of the electrostatic dust collector shell is connected with an air outlet of the electrostatic dust collector; the corona electrode is arranged at the middle position in the electrostatic precipitator shell, the dust collecting electrode is arranged in the electrostatic precipitator shell along the gas flow direction, and the steam nozzle is arranged at the top of the electrostatic precipitator. The air inlet of the electrostatic dust collector is connected with the air outlet of the cyclone dust collector through an air pipe, and the air outlet of the electrostatic dust collector is connected with the air inlet of the air chamber through an air pipe. After the exhaust air enters the electrostatic precipitator, ionization is completed under the discharge action of the corona electrode, dust particles acquire electric charges, meanwhile, a small amount of steam is introduced into the exhaust air through a steam nozzle, and after the steam is adsorbed by fine particles in the exhaust air, the fine particles grow and agglomerate into large particles, so that the dust collecting electrode is convenient to collect; the water mist adsorbed with the charged dust particles is more easily adsorbed by the dust collecting electrode under the action of the electric field force, enters the dust collecting groove of the electrostatic precipitator, and is discharged from the air outlet of the electrostatic precipitator and enters the air chamber after the secondary dust removal is completed by air exhaust.
Compared with the prior art that only remove dust through cyclone, this application introduces tiny dust particle in the wet electrostatic precipitator that wet electrostatic precipitator can be better in the absorption air, wet electrostatic precipitator steam jet connects high temperature steam source, lets in a small amount of steam in to the exhaust through the steam jet, and after tiny particle adsorbed vapor, grow up and condense into big granule, the extremely entrapment of being convenient for collect dust, the heat of steam is taken away by airing exhaust simultaneously, has also retrieved through heat pump system.
Simultaneously wet electrostatic precipitator among this application compares with the traditional wet electrostatic precipitator that thermal power plant adopted among the prior art through a large amount of water sprays flue gas dust removal, wet dust collector among this application has improved, change into vapor by the water spray, at first avoided traditional wet dust collector when drying is exhausted dust removal, can cause the heat loss problem of airing exhaust when using normal atmospheric temperature water smoke dust removal, secondly because of the humidity content of airing exhaust is great, less vapor can make the humidity of airing exhaust reach saturation, reach the effect that adsorbs tiny granule and condense and collect dust for big granule, the power consumption is lower than traditional wet dust collector.
Further, a hot air drying system is designed, wherein the heat pump is used as a heat source to perform heat recovery, the material dryer is a hot air drying device, for example, any drying device which takes hot air drying as a main drying mode, such as a roller dryer or a vibrating fluidized bed, can be used in the drying system.
Further, a method for drying materials by using any hot air drying system which can perform heat recovery by taking the heat pump as a heat source is designed, air in the environment enters a fresh air pipeline from a fresh air inlet under the action of a fan, enters a material dryer air inlet after being heated by a condenser, enters the material dryer from the material dryer air inlet, and after the drying process of materials to be dried in the material dryer is finished, hot air is discharged from a material dryer air outlet and enters an air pipe; the exhaust air enters the cyclone dust collector through an air pipe, rotates in a cyclone dust collector cylinder body, completes dust collection under the action of centrifugal force, is discharged from an air outlet of the top cyclone dust collector and enters the electrostatic dust collector; the exhaust air is ionized under the discharge action of the corona electrode, so that dust particles obtain charges, the charges are adsorbed by the dust collecting electrode and discharged from an air outlet of the electrostatic precipitator, the dust enters an air chamber after multi-stage dust removal, heat exchange is carried out between the dust entering the air chamber and a finless light pipe type heat exchanger in the air chamber, and heat is transferred to a refrigerant in the finless light pipe type heat exchanger and then discharged.
And meanwhile, the heat pump system is used for heat recovery of heat in exhaust air, the liquid refrigerant absorbs heat in an external environment through the finned tube heat exchanger, the external environment refers to an environment except an air chamber, the refrigerant absorbs heat and flows into the finless tube heat exchanger, vaporization is completed after the finless tube heat exchanger absorbs the heat in the exhaust air, the refrigerant is sucked into the compressor, the compressor compresses low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant and sends the high-temperature high-pressure gaseous refrigerant into the condenser, the refrigerant emits heat through the condenser to heat fresh air, the refrigerant emits heat to be cooled into liquid, the liquid refrigerant flows into the expansion valve, and flows into the finned tube heat exchanger again after being throttled and cooled by the expansion valve to be repeatedly circulated, and the air in the external environment and the heat in the exhaust air are continuously sent into the fresh air. The heat pump system in the application uses the two-stage evaporator to absorb heat from the environment and exhaust air respectively, so that the energy consumption of the hot air drying system is greatly reduced.
Further, the method for drying materials by using the hot air drying system which can perform heat recovery by taking the heat pump as a heat source is designed, the electrostatic precipitator is a wet electrostatic precipitator, a steam nozzle of the wet electrostatic precipitator is connected with a high-temperature steam source, a small amount of steam is introduced into the steam nozzle to generate high Wen Shuiwu to adsorb fine particles in exhaust air, so that the fine particles are condensed into large particles, dust collection is facilitated, meanwhile, the heat of the steam is taken away by the exhaust air, and the heat loss problem of the exhaust air generated when the traditional wet dust precipitator uses normal-temperature water mist for dust removal is avoided.
Furthermore, a method for drying materials by using the hot air drying system which can perform heat recovery by taking the heat pump as a heat source is designed, and the evaporation temperature of the finless light pipe type heat exchanger is set to be lower than the dew point temperature of exhaust air, so that the condensation heat in the exhaust air can be absorbed to the greatest extent.
The beneficial effects are that:
as can be seen from the above technical solutions, the technical solutions of the present invention provide a hot air drying system and a drying method for heat recovery by using a heat pump as a heat source, which have the following beneficial effects compared with the prior art: 1) The multistage dust removal system is arranged, particularly a wet electrostatic precipitator is introduced, fine particles are effectively removed, a large number of dust attachments on the finless light pipe type heat exchanger are avoided, and the running stability of the system is improved; 2) The exhaust dust content is reduced, which is beneficial to environmental protection; 3) The heat pump system is provided with the two-stage evaporation heat exchanger, so that heat can be absorbed from the outdoor environment, and heat can be recovered from exhaust air in a direct heat exchange mode, and the energy consumption of the drying system to electricity is further reduced.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a system according to the present invention.
FIG. 2 is a schematic diagram of a system in which the material dryer of the present invention is a drum dryer.
FIG. 3 is a schematic diagram of a system in which the material dryer of the present invention is a vibrating fluid bed dryer.
1. An air chamber; 2. a fan I; 3. an air outlet of the air chamber; 4. a finless light pipe heat exchanger; 5. a finned tube heat exchanger; 6. a compressor; 7. an expansion valve; 8. a fresh air inlet; 9. a condenser; 10. a fresh air pipeline; 11. a fan II; 12. a material dryer; 13. a fan III; 14. an exhaust duct; 15. a cyclone dust collector; 16. an air inlet of the cyclone dust collector; 17. an air outlet of the cyclone dust collector; 18. an air inlet of the electrostatic dust collector; 19. a steam nozzle; 20. an electrostatic precipitator; 21. an air outlet of the electrostatic precipitator 22, a steam source 23, a roller dryer 24 and a vibrating fluidized bed.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
Aspects of the invention are described in this disclosure with reference to the drawings, in which are shown a number of illustrative embodiments. The embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, may be implemented in any of a number of ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the disclosure may be used alone or in any suitable combination with other aspects of the disclosure.
In order to solve the problem that the energy consumption of a traditional hot air drying system is high, and simultaneously solve the problem that the heat exchange capacity of an evaporator is low due to ash blockage when the existing hot air drying system utilizes exhaust air, the application designs a hot air drying system which can perform heat recovery by taking a heat pump as a heat source. On the one hand, air enters from an inlet of a drying system, after the material to be dried in the drying system is dried, the air is discharged from an outlet of the drying system, then sequentially enters into a cyclone dust collector 15 and an electrostatic dust collector 20 in a multi-stage dust collection system for dust collection, and after the electrostatic dust collector 20 completes the last stage of dust collection, the air is discharged from an air outlet 21 of the electrostatic dust collector, enters into an air chamber 1 and is discharged outwards from an air chamber air outlet 3. On the other hand, the refrigerant circulates in the heat pump system, after absorbing the heat in the external environment in the finned tube heat exchanger 5, enters the finless light tube heat exchanger 4, and is vaporized after absorbing the heat in the exhaust air in the finless light tube heat exchanger 4, and is sucked into the compressor 6, the compressor 6 compresses the low-pressure gaseous refrigerant into the high-temperature high-pressure gaseous refrigerant, the high-pressure gaseous refrigerant is sent into the condenser 9, the refrigerant exchanges heat with the air entering the drying system through the condenser 9, the air absorbs heat and then enters the material dryer 12 for drying the material, and the refrigerant liquefies and flows into the finned tube heat exchanger 5 for absorbing heat again after releasing heat and circulates reciprocally.
In specific implementation, as shown in fig. 1, the application designs a hot air drying system which takes a heat pump as a heat source and can perform heat recovery, and the hot air drying system comprises a heat pump system, a drying system and a multistage dust removal system; the heat pump system comprises an air chamber 1, a finless light tube type heat exchanger 4 is arranged in the air chamber 1, an outlet of the finless light tube type heat exchanger 4 is connected with a compressor 6, an outlet of the compressor 6 is connected with a condenser 9, an outlet of the condenser 9 is connected with an expansion valve 7, an outlet of the expansion valve 7 is connected with a finned tube type heat exchanger 5, an outlet of the finned tube type heat exchanger 5 is connected with an inlet of the finless light tube type heat exchanger 4, and the finless light tube type heat exchanger 4, the compressor 6, the condenser 9, the expansion valve 7 and the finned tube type heat exchanger 5 are sequentially connected through refrigerant pipelines to form a closed heat pump system.
The heat exchange between the refrigerant and the air in the environment is carried out through the finned tube heat exchanger 5, the contact area between the finned tube heat exchanger 5 and the ambient air can be increased, the heat exchange capacity between the finned tube heat exchanger 5 and the ambient air is improved, the refrigerant absorbs heat and flows into the finless light tube heat exchanger 4, the finless light tube heat exchanger 4 exchanges heat with the exhaust air which is discharged from the electrostatic precipitator 20 and formed in the air chamber 1, the influence of residual dust in the exhaust air on the heat exchange of the finless light tube heat exchanger 4 can be reduced, and the drainage of condensed water is facilitated; the refrigerant absorbs heat and then is vaporized and sucked into the compressor 6; the compressor 6 compresses low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is sent into the condenser 9, and the refrigerant transfers heat to fresh air sucked into the fresh air pipeline 10 by the fan II 11 through the condenser 9; the refrigerant is condensed from gas state to release heat to liquid state and flows into the expansion valve 7, the liquid state refrigerant is throttled and cooled by the expansion valve 7 and then flows into the finned tube heat exchanger 5 again, the refrigerant is repeatedly circulated, and the heat in the ambient air and exhaust air is continuously sent into fresh air.
The drying system comprises a fresh air pipeline 10 and a material dryer 12, wherein one end of the fresh air pipeline 10 is connected with a fresh air inlet 8, the other end of the fresh air pipeline is connected with the material dryer 12, a condenser 9 is arranged in one end, close to the fresh air inlet 8, of the fresh air pipeline 10, and a fan II 11 is arranged in one end, close to the material dryer 12, of the fresh air pipeline 10; the fan II 11 sucks fresh air into the fresh air pipeline 10 from the fresh air inlet 8, performs heat exchange and heat absorption with the condenser 9, and then sends the fresh air into the material dryer 12, and the dried hot air enters the exhaust pipeline 14 under the action of the fan III 13.
The multistage dust removal system comprises a cyclone dust collector 15 and an electrostatic dust collector 20, wherein an air inlet 16 of the cyclone dust collector is connected with a material dryer 12 through an exhaust pipeline 14, an air outlet 17 of the cyclone dust collector is connected with an air inlet 18 of the electrostatic dust collector through an air pipe, and an air outlet 21 of the electrostatic dust collector is connected with an air inlet of an air chamber 1 through an air pipe. The air after drying in the material dryer 12 enters the cyclone dust collector 15 through the exhaust pipe 14, the exhaust air rotates in the cyclone dust collector 15, dust particles fall into a dust collecting groove of the cyclone dust collector at the bottom of the cyclone dust collector 15 under the action of centrifugal force, and the exhaust air is discharged from an air outlet 17 of the cyclone dust collector after primary dust collection and enters the electrostatic dust collector 20. The exhaust air is discharged from an air outlet 21 of the electrostatic precipitator after secondary dust removal in the electrostatic precipitator 20, enters the air chamber 1 through an air pipe, exchanges heat with the finless light pipe type heat exchanger 4, transfers heat to the refrigerant through high-temperature and high-humidity exhaust air, and is discharged from an air chamber air outlet 3 under the action of the fan I2.
In particular, the present application contemplates a hot air drying system that uses a heat pump as a heat source to enable heat recovery, and the electrostatic precipitator 20 is a wet electrostatic precipitator; the air inlet 18 of the electrostatic dust collector is connected with the air outlet 17 of the cyclone dust collector through an air pipe, and the air outlet 21 of the electrostatic dust collector is connected with the air inlet of the air chamber 1 through an air pipe. The exhaust air enters the electrostatic precipitator 20 and then is ionized at the corona electrode, so that dust particles acquire charges, the charges are absorbed by the dust collecting electrode and then fall into a dust collecting groove of the electrostatic precipitator, and the exhaust air is discharged from an air outlet 21 of the electrostatic precipitator and enters the air chamber 1 after secondary dust removal.
During concrete implementation, the application introduces tiny dust particle in the wet electrostatic precipitator that wet electrostatic precipitator can be better in the absorption air, wet electrostatic precipitator steam jet 19 connects high temperature steam source 22, let in a small amount of steam in to airing exhaust through steam jet 19, tiny particle in airing exhaust absorbs after the vapor, tiny particle growth is condensed into big granule, the collection dirt utmost point entrapment of being convenient for, steam adds simultaneously, can not reduce the enthalpy value of airing exhaust, the heat of steam is also taken away by airing exhaust, retrieve through heat pump system, the heat loss problem of airing exhaust that produces when traditional wet precipitator uses normal atmospheric temperature water smoke dust removal has been avoided.
In specific implementation, as shown in fig. 2 and 3, the present application designs a hot air drying system capable of performing heat recovery by using a heat pump as a heat source, where the material dryer 12 is a hot air drying device, and the hot air drying device may be any drying device using hot air drying as a main drying mode, such as a drum dryer 23 or a vibrating fluidized bed 24.
In specific implementation, the application designs a method for drying materials by using any hot air drying system which can perform heat recovery by taking a heat pump as a heat source, wherein the method is mainly based on the principle of reverse Carnot cycle, the heat pump is taken as the heat source to absorb heat in the environment and exhaust air through a refrigerant, the heat is transferred to air entering the drying system, the air enters the drying system to dry the materials after being heated, the materials are discharged from the drying system after being dried, the exhaust air after multi-stage dust removal flows into the heat pump system, the heat in the exhaust air is transferred to the refrigerant through heat exchange, and the heat is recycled.
Under the action of a fan II 11, air in the environment enters a fresh air pipeline 10 from a fresh air inlet 8, is heated by a condenser 9 and enters a material dryer 12, and after the material to be dried in the material dryer 12 is dried, the hot air is discharged from the material dryer 12 under the action of a fan III 13 and enters an exhaust pipeline 14; the exhaust air enters the cyclone dust collector 15 through the exhaust air pipe 14, rotates in the cyclone dust collector 15, completes dust removal under the action of centrifugal force, is discharged from the air outlet 17 of the top cyclone dust collector and enters the electrostatic dust collector 20; after the exhaust air enters the electrostatic precipitator 20, ionization is completed under the discharge action of the corona electrode, dust particles acquire electric charges, meanwhile, a small amount of steam is introduced into the electrostatic precipitator 20 through the steam nozzle 19, and after the tiny particles in the exhaust air absorb the steam, the particles grow up and agglomerate into large particles, so that the dust collecting electrode is convenient to collect; the water mist adsorbed with the charged dust particles is adsorbed by the dust collecting electrode under the action of the electric field force and then enters the dust collecting groove of the electrostatic dust collector; after the secondary dust removal of the exhaust air is completed, the exhaust air is discharged from an air outlet 21 of the electrostatic precipitator and enters the air chamber 1.
Discharged from an air outlet 21 of the electrostatic dust collector, enters an air chamber 1 after multi-stage dust removal, exchanges heat with a finless light tube heat exchanger 4 in the air chamber 1, transfers heat to a refrigerant in the finless light tube heat exchanger 4, and is discharged outwards from an air chamber air outlet 3 under the action of a fan I2.
Simultaneously, a heat pump system is used for heat recovery of heat in exhaust air; the refrigerant exchanges heat with the air in the environment through the finned tube heat exchanger 5, absorbs heat, flows into the finless light tube heat exchanger 4, exchanges heat with exhaust air through the finless light tube heat exchanger 4, absorbs heat through the finless light tube heat exchanger 4 and the finned tube heat exchanger 5, and then completes vaporization to be sucked into the compressor 6; the compressor 6 compresses low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is sent into the condenser 9, and the refrigerant transfers heat to the fan II 11 through the condenser 9 to suck fresh air in the fresh air pipeline 10; the refrigerant is condensed from gas state to release heat to liquid state and flows into the expansion valve 7, the liquid state refrigerant is throttled and cooled by the expansion valve 7 and then flows into the finned tube heat exchanger 5 again, the refrigerant is repeatedly circulated, and the heat in the ambient air and exhaust air is continuously sent into fresh air.
During specific implementation, the application designs a method for drying materials by utilizing the hot air drying system which can perform heat recovery by taking the heat pump as a heat source, wherein the wet electrostatic precipitator is adopted by the electrostatic precipitator, the steam nozzle 19 of the wet electrostatic precipitator is connected with the high-temperature steam source 22, a small amount of steam is introduced into exhaust air through the steam nozzle 19, after the tiny particles in the exhaust air adsorb the steam, the tiny particles grow up and are condensed into large particles, the collection of dust collecting electrodes is facilitated, meanwhile, the enthalpy value of the exhaust air cannot be reduced by adding the steam, the heat of the steam is also taken away by the exhaust air, and the heat is recovered through the heat pump system, so that the problem of exhaust air heat loss generated when the traditional wet dust collector uses normal-temperature water mist for dust removal is avoided.
In specific implementation, the application designs a method for drying materials by using the hot air drying system which can perform heat recovery by taking the heat pump as a heat source, and the evaporation temperature of the finless light pipe type heat exchanger 4 is lower than the dew point temperature of exhaust air, so that the condensation heat in the exhaust air can be absorbed to the greatest extent, the recovery rate of the heat in the exhaust air is improved, and the energy consumption of the drying system is reduced.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (7)
1. A hot air drying system for heat recovery using a heat pump as a heat source, characterized in that: the system comprises a heat pump system, a drying system and a multistage dust removal system;
the heat pump system comprises an air chamber, wherein a finless light pipe type heat exchanger is arranged in the air chamber, an outlet of the finless light pipe type heat exchanger is connected with a compressor, an outlet of the compressor is connected with a condenser, an outlet of the condenser is connected with an expansion valve, an outlet of the expansion valve is connected with a finned tube heat exchanger, an outlet of the finned tube heat exchanger is connected with an inlet of the finless light pipe type heat exchanger, and the finless light pipe type heat exchanger, the compressor, the condenser, the expansion valve and the finned tube heat exchanger are sequentially connected through refrigerant pipelines;
the drying system comprises a fresh air pipeline and a material dryer, wherein one end of the fresh air pipeline is connected with a fresh air inlet, the other end of the fresh air pipeline is connected with an air inlet of the material dryer, the condenser is arranged in one end, close to the fresh air inlet, of the fresh air pipeline, and a fan II is arranged in one end, close to the air inlet of the material dryer, of the fresh air pipeline;
the multistage dust removal system comprises a cyclone dust collector and an electrostatic dust collector, wherein an air inlet of the cyclone dust collector is connected with an air outlet of a material dryer, an air outlet of the cyclone dust collector is connected with an air inlet of the electrostatic dust collector, an air outlet of the electrostatic dust collector is connected with an air inlet of the air chamber, and the material dryer, the cyclone dust collector, the electrostatic dust collector and the air chamber are connected through air pipes.
2. The hot air drying system according to claim 1, wherein the heat pump is used as a heat source for heat recovery, and the hot air drying system is characterized in that: the electrostatic dust collector is a wet electrostatic dust collector, and comprises an electrostatic dust collector shell, a corona electrode, a dust collecting electrode and a steam nozzle, wherein one end of the electrostatic dust collector shell is connected with an electrostatic dust collector air inlet, and the other end of the electrostatic dust collector shell is connected with an electrostatic dust collector air outlet; the corona electrode is arranged at the middle position in the electrostatic precipitator shell, the dust collecting electrode is arranged in the electrostatic precipitator shell along the gas flow direction, and the steam nozzle is arranged at the top of the electrostatic precipitator.
3. A hot air drying system using a heat pump as a heat source and performing heat recovery as claimed in claim 2, wherein: the material dryer is a hot air drying device.
4. A hot air drying system according to claim 3, wherein the heat pump is used as a heat source and the heat recovery is performed, and wherein: the hot air drying device is a roller dryer or a vibrating fluidized bed.
5. A drying method of a hot air drying system for heat recovery using a heat pump as a heat source according to any one of claims 1 to 4, characterized in that: under the action of a fan, air in the environment enters a fresh air pipeline from a fresh air inlet, is heated by a heat pump condenser and then enters a material dryer through an air inlet of the material dryer, and after the drying process of the air in the material dryer is finished, the air is discharged from an air outlet of the material dryer and enters an air pipe; the air sequentially passes through a cyclone dust collector and an electrostatic dust collector from an air pipe to form exhaust air, and the exhaust air enters an air chamber to exchange heat with a finless light pipe heat exchanger in the air chamber, and the heat is transferred to a refrigerant in the finless light pipe heat exchanger and then is discharged;
heat recovery is carried out on heat in exhaust air by using a heat pump system; the refrigerant is absorbed by the finned tube heat exchanger and then enters the finless light tube heat exchanger, the finless light tube heat exchanger absorbs the heat in exhaust air and then is vaporized, the vaporized heat is absorbed by the compressor, the low-pressure gaseous refrigerant is compressed into high-temperature high-pressure gaseous refrigerant by the compressor and then is sent into the condenser, and the heat of the refrigerant is released by the condenser to heat fresh air.
6. A drying method of a hot air drying system for heat recovery using a heat pump as a heat source according to claim 5, wherein: the electrostatic precipitator is wet electrostatic precipitator, wet electrostatic precipitator steam spout connects high temperature steam source, lets in a small amount of steam in to airing exhaust through the steam spout, makes the tiny particle in airing exhaust after adsorbing vapor, and growth is condensed into big granule, and the collection dirt utmost point entrapment of being convenient for, steam addition can not reduce the enthalpy value of airing exhaust simultaneously, and the heat of steam is taken away by airing exhaust, retrieves through heat pump system.
7. A drying method of a hot air drying system for heat recovery using a heat pump as a heat source according to claim 6, wherein: the evaporation temperature of the finless light pipe heat exchanger is lower than the dew point temperature of the exhaust air.
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| CN111380354B (en) * | 2020-04-14 | 2023-10-27 | 磐石自动化系统（深圳）有限公司 | Tail gas circulation system of dryer |
| CN111536716B (en) * | 2020-05-13 | 2021-11-02 | 江苏新七彩节能有限公司 | Air source heat pump system with split evaporator assembly and method of operating the same |
| CN111947411A (en) * | 2020-08-23 | 2020-11-17 | 赵雪虎 | Energy-concerving and environment-protective building sand material drying-machine |
| CN116863837B (en) * | 2023-08-07 | 2024-04-19 | 深圳市新世纪拓佳光电技术有限公司 | Liquid crystal display screen |
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