CN111678298A - Heat pump drying system - Google Patents
Heat pump drying system Download PDFInfo
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- CN111678298A CN111678298A CN202010653064.7A CN202010653064A CN111678298A CN 111678298 A CN111678298 A CN 111678298A CN 202010653064 A CN202010653064 A CN 202010653064A CN 111678298 A CN111678298 A CN 111678298A
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- air
- duct
- heat pump
- heat
- air duct
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- 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
- F26B9/02—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in buildings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- 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
- 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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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to the technical field of heat pump drying, and provides a heat pump drying system. This heat pump drying system includes: a curing barn for performing a drying process of the material to be dried; and the heat pump mechanism is respectively connected with the curing barn through an air supply duct and an air return duct. According to the invention, the continuous feeding and discharging of the materials to be dried are realized by arranging the curing barn, and the drying process is completed; in heat pump mechanism sent hot dry air into the roast room through the air supply wind channel, the realization was dried the material of treating in the roast room, and the return air wind channel is retrieved the humid air in the roast room, realizes treating the recovery of the dry material drying in-process hydrofuge lost energy, and the humid air returns to in the roast room after heat pump mechanism handles, realizes the recovery and cyclic utilization of used heat, reduces the energy consumption by a wide margin, green is pollution-free.
Description
Technical Field
The invention relates to the technical field of heat pump drying, in particular to a heat pump drying system.
Background
The drying is an important step in the processing and production of the American ginseng, and can separate the moisture in wet materials, so that the American ginseng can be conveniently stored, and the product quality is ensured. After the American ginseng is harvested, impurities such as soil, dust and the like adsorbed on the surface of the American ginseng are removed through cleaning, and then the American ginseng is sent into a drying device. The types of the processed American ginseng are hard and soft, the corresponding drying process has larger difference, and higher requirements are put forward for the drying process.
The existing American ginseng adopts a drying process of coal-fired drying equipment, and has the problems of high pollution and high energy consumption.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a heat pump drying system to solve the problems of high pollution and high energy consumption of the conventional American ginseng drying process.
According to an embodiment of the invention, the heat pump drying system comprises:
a curing barn for performing a drying process of the material to be dried;
and the heat pump mechanism is respectively connected with the curing barn through an air supply duct and an air return duct.
According to one embodiment of the invention, an air distribution duct is arranged in the curing barn, the air distribution duct is communicated with the air supply duct, and the air distribution duct is provided with an air distribution branch duct which is perpendicular to the air distribution duct.
According to one embodiment of the invention, the air distribution branch air duct is provided with a plurality of air outlets along the axial direction of the air distribution branch air duct, and the distance between two adjacent air outlets is sequentially increased along the axial direction of the air distribution branch air duct and the direction departing from the air distribution air duct.
According to one embodiment of the invention, the baking room is provided with a return air inlet, the return air inlet is connected with the return air duct, and the return air inlet is provided with a shutter;
the curing barn is also provided with a moisture exhaust port, and the moisture exhaust port is provided with a moisture exhaust fan.
According to one embodiment of the invention, the heat pump mechanism comprises a heat pump unit, the heat pump unit is arranged in a main air duct, the return air duct is connected with an air inlet of the main air duct, and the supply air duct is communicated with an air outlet of the main air duct.
According to one embodiment of the invention, the heat pump unit comprises an evaporator, a condenser, a throttling device and a compressor, wherein the evaporator, the condenser, the throttling device and the compressor are sequentially connected through a refrigerant pipeline;
and along the direction from the air inlet to the air outlet of the main air channel, the evaporator and the condenser are sequentially arranged in the main air channel.
According to one embodiment of the invention, the loop heat pipe mechanism comprises a first heat exchanger, a second heat exchanger and a pump, wherein a liquid inlet of the first heat exchanger is connected with a liquid outlet of the second heat exchanger through a first heat pipe, a liquid outlet of the first heat exchanger is connected with a liquid inlet of the second heat exchanger through a second heat pipe, and the pump is arranged on the first heat pipe;
the first heat exchanger is arranged in the main air duct and is positioned between the air inlet of the main air duct and the evaporator;
the second heat exchanger is arranged in the main air duct and is positioned between the fourth evaporator and the condenser.
According to one embodiment of the invention, the main air duct between the second heat exchanger and the condenser is communicated with one end of a bypass air duct, the other end of the bypass air duct is communicated with the return air duct, and the bypass air duct is provided with a first regulating valve.
According to one embodiment of the invention, a heating pipe is arranged in the main air duct, and the heating pipe is arranged between the condenser and an air outlet of the main air duct.
According to one embodiment of the invention, an air supply fan is arranged in the air supply duct, and a return air fan is arranged in the return air duct.
One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:
the embodiment of the invention is provided with a curing barn used for carrying out a drying process of materials to be dried; and the heat pump mechanism is respectively connected with the curing barn through an air supply duct and an air return duct. The continuous feeding and discharging of the materials to be dried are realized by arranging the curing barn, and the drying process is completed; in heat pump mechanism sent hot dry air into the roast room through the air supply wind channel, the realization was dried the material of treating in the roast room, and the return air wind channel is retrieved the humid air in the roast room, realizes treating the recovery of the dry material drying in-process hydrofuge lost energy, and the humid air returns to in the roast room after heat pump mechanism handles, realizes the recovery and cyclic utilization of used heat, reduces the energy consumption by a wide margin, green is pollution-free.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a heat pump drying system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a drying process of a heat pump drying system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a curing barn of a heat pump drying system according to an embodiment of the invention.
Reference numerals:
100. a curing barn; 110. an air distribution duct; 120. distributing air branch air channels; 121. an air outlet; 130. an air return opening; 140. a moisture removal port; 150. a moisture exhausting fan; 160. a door;
200. a heat pump mechanism; 211. a first evaporator; 212. a first condenser; 213. a first compressor; 214. a first throttle valve; 221. a second evaporator; 222. a second condenser; 223. a second compressor; 224. a second throttle valve; 231. a third evaporator; 232. a third condenser; 233. a third compressor; 234. a third throttle valve; 241. a fourth evaporator; 242. a fourth condenser; 243. a fourth compressor; 244. a fourth throttle valve;
300. an air supply duct; 310. an air supply fan;
400. an air return duct; 410. a return air fan;
500. a main air duct;
610. a first heat exchanger; 620. a second heat exchanger; 630. a pump;
700. a bypass air duct;
800. heating the tube.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1 to 3, an embodiment of the present invention provides a heat pump drying system, including: a curing barn 100 for performing a drying process of a material to be dried;
the heat pump mechanism 200, the heat pump mechanism 200 is connected with the baking room 100 through the supply air duct 300 and the return air duct 400 respectively. It will be appreciated that the curing barn 100 is intended to serve as a drying chamber and provide a location for performing a drying process of the material to be dried. Through transporting away the dry material of treating that accomplishes the drying in the baking house 100, will treat that dry material of treating transports to baking house 100 in, realize continuous drying and treat dry material, improve drying efficiency.
Further, the heat pump mechanism 200 is connected with the baking room 100 through the air supply duct 300, and hot dry air is sent into the baking room 100, so that the materials to be dried in the baking room 100 are dried, and the hot dry air takes away the moisture in the materials to be dried to become low-temperature low-humidity air.
Wherein, the baking room 100 is connected with the heat pump mechanism 200 through the return air duct 400, and as the air current flows, the low-temperature and low-humidity air in the baking room 100 enters the return air duct 400 and is discharged out of the baking room 100. Low-temperature low humid air gets into heat pump mechanism 200 by return air wind channel 400, heat pump mechanism 200 carries out reuse to the waste heat in the humid air of roast room 100 exhaust, carry out cooling dehumidification and wait humid heat treatment's heat transfer to system well circulating air and handle, make low-temperature low humid air become hot dry air, and carry to roast room 100 in by air supply wind channel 300 once more, treat dry material and carry out drying in circulation, realize treating the recovery of the lost energy of dry material drying in-process hydrofuge, realize recovery and cyclic utilization of used heat, guarantee the drying effect and the product quality of treating dry material, reduce the energy consumption by a wide margin, green is pollution-free.
In an embodiment of the present invention, an air distribution duct 110 is disposed in the curing barn 100, the air distribution duct 110 is communicated with the air supply duct 300, the air distribution duct 110 is provided with an air distribution branch duct 120, and the air distribution branch duct 120 is perpendicular to the air distribution duct 110. It is understood that a door 160 is provided at one side of the curing barn 100 for allowing the material to be dried to enter the curing barn 100 through the door 160, closing the door 160 to form a closed drying chamber in the curing barn 100, and opening the door 160 to deliver the dried material to be dried out of the curing barn 100.
Further, an air distribution duct 110 is disposed in the curing barn 100 at a side corresponding to the door 160, as shown in fig. 3, the air distribution duct 110 is horizontally and transversely disposed in the curing barn 100, and the length of the air distribution duct 110 is the same as the distance between the left and right side walls in the curing barn 100. The air distribution duct 110 is communicated with the air supply duct 300, so that hot dry air is conveyed into the air distribution duct 110.
Wherein, the air distribution duct 110 is provided with an air distribution branch duct 120, and the air distribution branch duct 120 is horizontally and longitudinally arranged. One end of the air distribution branch duct 120 communicates with the air distribution duct 110, and the other end of the air distribution branch duct 120 extends toward the door 160. The flowing direction of the hot dry air in the air distribution branch air duct 120 is perpendicular to the flowing direction of the hot dry air in the air distribution air duct 110, so that the hot dry air is conveyed into the curing barn 100, and the drying efficiency is improved.
As shown in fig. 3, in the embodiment of the present invention, the air distribution duct 110 and the air distribution branch duct 120 are disposed at the bottom side of the curing barn 100, so that the hot dry air rises from the bottom of the curing barn 100 to dry the material to be dried placed in the curing barn 100. The air distribution branch air channels 120 are arranged side by side along the length direction of the air distribution air channel 110, and the specific number can be specifically set according to the size of the baking room 100, so that the filling range of hot dry air in the baking room 100 is improved, the drying uniformity is ensured, and the drying quality of materials to be dried is improved.
In an embodiment of the present invention, the air distribution branch duct 120 is provided with a plurality of air outlets 121 along an axial direction thereof, and a distance between two adjacent air outlets 121 increases sequentially along the axial line of the air distribution branch duct 120 and in a direction departing from the air distribution duct 110. It can be understood that the air distribution branch duct 120 is provided with a plurality of air outlets 121 along the axial direction thereof, i.e. the flowing direction of the hot dry air in the air distribution branch duct 120, so that the hot dry air enters the curing barn 100 through the air outlets 121, the hot dry air is ensured to be uniformly distributed in the curing barn 100, and the drying effect and efficiency are improved.
Further, the distance between two adjacent air outlets 121 increases in sequence along the axis of the air distribution branch duct 120 and in the direction away from the air distribution duct 110, that is, the concentration of the air outlets 121 at the end of the air distribution branch duct 120 close to the air distribution duct 110 is high relative to the air outlets 121 at the end of the air distribution branch duct 120 far from the air distribution duct 110. Because the wind pressure when the wind distribution duct 110 enters the wind distribution branch duct 120 is large, in order to ensure that the wind pressure at each position in the wind distribution branch duct 120 is balanced as much as possible, the wind outlets 121 are arranged from dense arrangement to sparse arrangement in the direction from the starting end to the ending end of the wind distribution branch duct 120, so that the hot dry air is uniformly distributed in the curing barn 100, and the heat inside the curing barn 100 is ensured to be uniform. An air outlet 121 is also provided on the end face of the terminating end of the air distribution branch duct 120.
In an embodiment of the present invention, an electric air valve is disposed at the connection between the air distribution branch duct 120 and the air distribution duct 110, i.e. at the beginning of the air distribution branch duct 120, and the opening degree of the electric air valve is adjusted according to the temperature setting in the curing barn 100 in the actual process, so as to control the drying degree of the material to be dried.
In one embodiment of the present invention, the baking room 100 is provided with a return air inlet 130, the return air inlet 130 is connected with a return air duct 400, and the return air inlet 130 is provided with a shutter; the curing barn 100 is further provided with a moisture exhaust port 140, and the moisture exhaust port 140 is provided with a moisture exhaust fan 150. It is understood that the curing barn 100 is a box type dryer, and adopts the bottom side air inlet and the upper side air return mode. The top of the curing barn 100 is provided with a plurality of air return openings 130, and in this embodiment, as shown in fig. 3, four air return openings 130 are uniformly arranged. The return air inlet 130 is connected with the return air duct 400, so that low-temperature and low-humidity air generated after the drying action of the materials to be dried is conveyed into the return air duct 400 through the return air inlet 130. The air return opening 130 is provided with a shutter, so that low-temperature and low-humidity air is always discharged from the interior of the baking room 100 to the exterior, and the materials to be dried in the baking room 100 are prevented from being dampened and from being mildewed and rotten to cause large loss. The number of the air return openings 130 can be set to 4-8, and can also be specifically set according to actual needs.
Further, the upper side of the curing barn 100 is further provided with a moisture discharging opening 140, the moisture discharging opening 140 is provided with a moisture discharging fan 150, since moisture in the hard drying initial stage of the material to be dried is large, the moisture needs to be discharged in time, and in order to reduce the workload of the heat pump mechanism 200, part of the moisture in the curing barn 100 is discharged out of the curing barn 100 by opening the moisture discharging fan 150. The moisture exhaust ports 140 can be set to 2 to 4, and can be specifically set according to the actual process requirement.
It should be noted that in the embodiment of the present invention, the cart is used to transport the material to be dried, the cart is pushed into the baking room 100, the multi-layer material rack on the upper side of the cart is located right above the air distribution branch duct 120, the hot dry air exhausted from the air outlet 121 of the air distribution branch duct 120 passes through the multi-layer material rack, the material to be dried in the material tray arranged on the material rack is dried, and then the material to be dried is exhausted from the baking room 100 through the air return opening 130, so as to complete the drying of the material to be dried.
In an embodiment of the present invention, the heat pump mechanism 200 includes a heat pump unit, the heat pump unit is disposed in the main air duct 500, the return air duct 400 is connected to an air inlet of the main air duct 500, and the supply air duct 300 is communicated with an air outlet of the main air duct 500. It can be understood that, as shown in fig. 2, in the embodiment of the present invention, the heat pump mechanism 200 includes a first heat pump unit, a second heat pump unit, a third heat pump unit, and a fourth heat pump unit that are disposed in the main air duct 500, the return air duct 400 is connected to an air inlet of the main air duct 500, and the supply air duct 300 is communicated with an air outlet of the main air duct 500, so that the main air duct 500, the supply air duct 300, the baking room 100, and the return air duct 400 form a circulating loop.
It should be noted that the first heat pump unit, the second heat pump unit, the third heat pump unit and the fourth heat pump unit are arranged in series in the main air duct 500, the first heat pump unit is a first-stage heat pump unit, the second heat pump unit is a second-stage heat pump unit, the third heat pump unit is a third-stage heat pump unit, the fourth heat pump unit is a fourth-stage heat pump unit, each stage of heat pump unit is a vapor compression refrigeration cycle, and different freon refrigerants can be configured, wherein the refrigerants of the third-stage heat pump unit and the fourth-stage heat pump unit can be R22, R32 or R407C, and the refrigerants of the first-stage heat pump unit and the second-stage heat pump unit can be R.
In one embodiment of the invention, the heat pump unit comprises an evaporator, a condenser, a throttling device and a compressor, wherein the evaporator, the condenser, the throttling device and the compressor are sequentially connected through a refrigerant pipeline; along the direction from the air inlet to the air outlet of the main air duct 500, the evaporator and the condenser are sequentially arranged in the main air duct 500. It can be understood that the refrigerant is compressed into high-temperature and high-pressure gas by the compressor and is discharged into the condenser from the gas outlet of the compressor, the heat of the refrigerant is absorbed by the condenser, the heat released by the condenser is used for heating the curing barn 100, the cooled refrigerant is cooled and depressurized into refrigerant liquid by the throttling device, and the refrigerant liquid flows through the evaporator, is evaporated by the evaporator and absorbs heat and then flows into the liquid inlet of the compressor. As shown in fig. 2, in the embodiment of the present invention, the first heat pump unit includes a first evaporator 211, a first condenser 212, and a first compressor 213, a liquid outlet of the first evaporator 211 is connected to a liquid inlet of the first condenser 212 through a first liquid outlet pipe, a liquid outlet of the first condenser 212 is connected to a liquid inlet of the first evaporator 211 through a first liquid inlet pipe, the first compressor 213 is disposed on the first liquid inlet pipe, and a first throttle valve 214 is disposed on the first liquid outlet pipe; the second heat pump unit comprises a second evaporator 221, a second condenser 222 and a second compressor 223, a liquid outlet of the second evaporator 221 is connected with a liquid inlet of the second condenser 222 through a second liquid outlet pipe, a liquid outlet of the second condenser 222 is connected with a liquid inlet of the second evaporator 221 through a second liquid inlet pipe, the second compressor 223 is arranged on the second liquid inlet pipe, and a second throttle valve 224 is arranged on the second liquid outlet pipe; the third heat pump unit comprises a third evaporator 231, a third condenser 232 and a third compressor 233, a liquid outlet of the third evaporator 231 is connected with a liquid inlet of the third condenser 232 through a third liquid outlet pipe, a liquid outlet of the third condenser 232 is connected with a liquid inlet of the third evaporator 231 through a third liquid inlet pipe, the third compressor 233 is arranged on the third liquid inlet pipe, and a third throttle 234 is arranged on the third liquid outlet pipe; the fourth heat pump unit includes a fourth evaporator 241, a fourth condenser 242 and a fourth compressor 243, a liquid outlet of the fourth evaporator 241 is connected with a liquid inlet of the fourth condenser 242 through a fourth liquid outlet pipe, a liquid outlet of the fourth condenser 242 is connected with a liquid inlet of the fourth evaporator 241 through a fourth liquid inlet pipe, the fourth compressor 243 is arranged on the fourth liquid inlet pipe, and a fourth throttle valve 244 is arranged on the fourth liquid outlet pipe.
Further, along the direction from the air inlet to the air outlet of the main air duct 500, the first evaporator 211, the second evaporator 221, the third evaporator 231, the fourth evaporator 241, the fourth condenser 242, the third condenser 232, the second condenser 222, and the first condenser 212 are sequentially disposed in the main air duct 500.
The evaporation temperatures of the first evaporator 211, the second evaporator 221, the third evaporator 231 to the fourth evaporator 241 are sequentially decreased, and the condensation temperatures of the first condenser 212, the second condenser 222, the third condenser 232 to the fourth condenser 242 are sequentially decreased. Specifically, the return air duct 400 conveys low-temperature low-humidity air into the main air duct 500, the low-temperature low-humidity air sequentially contacts with the first evaporator 211, the second evaporator 221, the third evaporator 231 and the fourth evaporator 241, is cooled and dehumidified into saturated humid air, sequentially passes through the fourth condenser 242, the third condenser 232, the second condenser 222 and the first condenser 212, is heated to be high-temperature low-humidity hot dry air after being heated to be high-temperature low-humidity hot dry air, and is conveyed to the air supply duct 300 through the main air duct 500 to enter the baking room 100, so that materials to be dried are dried.
In an embodiment of the present invention, a water pan is disposed at a bottom side of the evaporator in the main air duct 500 for receiving condensed water generated by the evaporator during operation, and the water pan is connected to a water outlet in the main air duct 500 for discharging the condensed water out of the main air duct 500. A water baffle is arranged in the main air duct 500 and is arranged between the evaporator and the condenser to prevent condensed water from entering the bottom side of the condenser, so that the heating effect of the condenser is reduced, and the quality of hot dry air is affected.
In an embodiment of the present invention, the loop heat pipe mechanism further comprises a loop heat pipe mechanism, the loop heat pipe mechanism comprises a first heat exchanger 610, a second heat exchanger 620 and a pump 630, an inlet of the first heat exchanger 610 is connected with an outlet of the second heat exchanger 620 through the first heat pipe, an outlet of the first heat exchanger 610 is connected with an inlet of the second heat exchanger 620 through the second heat pipe, and the pump 630 is disposed on the first heat pipe; the first heat exchanger 610 is arranged in the main air duct 500 and is located between an air inlet of the main air duct 500 and the evaporator; the second heat exchanger 620 is disposed in the main air duct 500 and between the evaporator and the condenser. It is to be understood that the pump 630 is a fluorine pump to provide flow power for R22 refrigerant circulating between the first heat exchanger 610 and the second heat exchanger 620. The first heat exchanger 610 and the second heat exchanger 620 realize circulating heat exchange through the first heat pipe and the second heat pipe.
Further, the first heat exchanger 610 is disposed in the main air duct 500 and located between the air inlet of the main air duct 500 and the first evaporator 211, that is, the wet air exhausted from the curing barn 100 is subjected to the heat absorption and temperature reduction pretreatment by the first heat exchanger 610, and then passes through the first evaporator 211.
The second heat exchanger 620 is disposed in the main air duct 500 and located between the fourth evaporator 241 and the fourth condenser 242, that is, the saturated air after being cooled and dehumidified by the fourth evaporator 241 is subjected to heat releasing, temperature increasing and preheating treatment by the second heat exchanger 620, and then passes through the condenser.
In one embodiment of the present invention, the first heat pipe is further provided with a liquid storage tank and a flow regulating valve, and the fluorine pump is used for delivering the liquid refrigerant in the liquid storage tank to the first heat exchanger 610 to provide power for the whole refrigerant cycle. The liquid storage tank is used for storing liquid refrigerant, and a liquid level sensor is arranged on the liquid storage tank and used for monitoring the liquid level of the refrigerant in the liquid storage tank and performing starting and stopping protection on the fluorine pump. The flow regulating valve regulates the flow of the refrigerant in the first heat pipe.
In one embodiment of the present invention, the main air duct 500 between the second heat exchanger 620 and the condenser is communicated with one end of a bypass air duct 700, the other end of the bypass air duct 700 is communicated with the return air duct 400, and the bypass air duct 700 is provided with a first adjusting valve. It can be understood that, as shown in fig. 2, in the embodiment of the present invention, the main air duct 500 located between the second heat exchanger 620 and the fourth condenser 242 is communicated with one end of the bypass air duct 700, and the other end of the bypass air duct 700 is communicated with the return air duct 400, so that a part of the low-temperature and low-humidity air in the return air duct 400 is conveyed into the main air duct 500 to directly act with the condenser, thereby avoiding the cooling and dehumidifying effects with the evaporator, and retaining the humidity of the low-temperature and low-humidity air.
Further, the bypass air duct 700 is provided with a first adjusting valve, which is specifically an electric air valve, for controlling the opening and closing of the bypass air duct 700, thereby realizing a hard and soft drying mode for the material to be dried. It is worth to be noted that, the bypass air duct 700 is opened, and part of the low-temperature and low-humidity air in the return air duct 400 is conveyed into the main air duct 500, directly acts with the condenser, retains the humidity of the low-temperature and low-humidity air, and enters the curing barn 100 through the air supply duct 300, so as to realize the soft drying of the material to be dried; the bypass air duct 700 is closed, and the low-temperature and low-humidity air in the return air duct 400 passes through the evaporator and the condenser in turn to form hot dry air, and enters the curing barn 100 through the air supply duct 300, so that the hard drying of the materials to be dried is realized.
In an embodiment of the present invention, a heating pipe 800 is disposed in the main air duct 500, and the heating pipe 800 is disposed between the condenser and the air outlet of the main air duct 500. It is understood that, as shown in fig. 2, in the embodiment of the present invention, the heating pipe 800 is disposed between the first condenser 212 and the air outlet of the main air duct 500 to assist in heating the hot dry air to the temperature required by the drying process.
In an embodiment of the present invention, a supply air blower 310 is disposed in the supply air duct 300, and a return air blower 410 is disposed in the return air duct 400. It is understood that the supply fan 310 is embodied as a centrifugal fan for providing power for the inflow of the hot dry air in the supply air duct 300 into the curing barn 100. The return air fan 410 is specifically an axial flow fan, and is used for sending the return air humid air in the curing barn 100 into the main duct 500 through the return air duct 400.
In an embodiment of the present invention, the heat pump system further comprises a control panel, wherein the control panel is connected to the heat pump unit and is used for setting a loading temperature set value and an unloading temperature set value.
Specifically, when the actual air supply temperature value of the heat pump unit is lower than the loading temperature set value, the control panel starts the heat pump unit from the first-stage heat pump unit to the fourth-stage heat pump unit step by step, and the starting interval is 5 min;
when the actual air supply temperature value of the heat pump units is higher than the unloading temperature set value, the control panel starts an unloading mode, the unloading heat pump units are sequentially from a four-stage heat pump unit to a first-stage heat pump unit, and the unloading delay of each stage of heat pump unit is 3 min;
when the actual air supply temperature value of the heat pump unit is between the loading temperature set value and the unloading temperature set value, the heat pump drying system is stably operated without starting or stopping the compressor.
The curing barn 100 can set a target temperature through the control panel, and when the actual temperature in the curing barn 100 is lower than a set value of the target temperature, an air supply air valve in an air supply duct is opened to a maximum value; when the actual temperature value in the curing barn 100 is higher than the target temperature set value, the opening degree of the air supply air valve in the air supply duct is adjusted to control the temperature in the curing barn 100.
In the embodiment of the invention, taking the drying of American ginseng as an example, in the hard American ginseng drying process, the temperature of the curing barn 100 is increased to more than 40 ℃ within 6h, then the target temperature of the curing barn 100 is set to 45 ℃, moisture in the curing barn 100 is discharged all the time and is not reserved until the drying is finished, and the moisture is discharged out of the curing barn 100 by the moisture discharging fan 150 which is started up in the early stage of the drying process;
in the soft American ginseng drying process, the drying time is about 15 days, the drying temperature is increased by 2 ℃ every day from 26 ℃ to 40 ℃, and the relative humidity in a curing barn 100 is kept at about 60 percent; then, the temperature is reduced by 2 ℃ every day until the temperature is 30 ℃, and the relative humidity in the curing barn 100 is kept at about 50 percent; and then, the temperature is maintained at 30-32 ℃, the relative humidity in the curing barn 100 is kept at about 40% until the drying is finished, and the relative humidity in the curing barn 100 is adjusted by adjusting the opening degree of an electric air valve in the bypass air duct 700.
One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:
the embodiment of the invention is provided with a curing barn used for carrying out a drying process of materials to be dried; and the heat pump mechanism is respectively connected with the curing barn through an air supply duct and an air return duct. The continuous circulation of the materials to be dried is realized by arranging the curing barn; in heat pump mechanism sent hot dry air into the roast room through the air supply wind channel, the realization was dried the material of treating in the roast room, and the return air wind channel is retrieved the humid air in the roast room, realizes treating the recovery of the dry material drying in-process hydrofuge lost energy, and the humid air returns to in the roast room after heat pump mechanism handles, realizes the recovery and cyclic utilization of used heat, reduces the energy consumption by a wide margin, green is pollution-free.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (10)
1. A heat pump drying system, comprising:
a curing barn for performing a drying process of the material to be dried;
and the heat pump mechanism is respectively connected with the curing barn through an air supply duct and an air return duct.
2. The heat pump drying system of claim 1, wherein an air distribution duct is provided in the flue-curing barn, the air distribution duct is communicated with the air supply duct, the air distribution duct is provided with an air distribution branch duct, and the air distribution branch duct is perpendicular to the air distribution duct.
3. The heat pump drying system of claim 2, wherein the air distribution branch duct is provided with a plurality of air outlets along an axial direction thereof, and a distance between two adjacent air outlets increases in sequence along the axial direction of the air distribution branch duct and in a direction away from the air distribution duct.
4. The heat pump drying system of claim 1, wherein the baking room is provided with a return air inlet, the return air inlet is connected with the return air duct, and the return air inlet is provided with a shutter;
the curing barn is also provided with a moisture exhaust port, and the moisture exhaust port is provided with a moisture exhaust fan.
5. The heat pump drying system of claim 1, wherein the heat pump mechanism comprises a heat pump unit, the heat pump unit is disposed in a main air duct, the return air duct is connected to an air inlet of the main air duct, and the supply air duct is communicated with an air outlet of the main air duct.
6. The heat pump drying system of claim 5, wherein the heat pump unit comprises an evaporator, a condenser, a throttling device and a compressor, and the evaporator, the condenser, the throttling device and the compressor are connected in sequence through refrigerant pipelines;
and along the direction from the air inlet to the air outlet of the main air channel, the evaporator and the condenser are sequentially arranged in the main air channel.
7. The heat pump drying system of claim 6, further comprising a loop heat pipe mechanism, wherein the loop heat pipe mechanism comprises a first heat exchanger, a second heat exchanger and a pump, an inlet of the first heat exchanger is connected with an outlet of the second heat exchanger through a first heat pipe, an outlet of the first heat exchanger is connected with an inlet of the second heat exchanger through a second heat pipe, and the pump is arranged on the first heat pipe;
the first heat exchanger is arranged in the main air duct and is positioned between the air inlet of the main air duct and the evaporator;
the second heat exchanger is arranged in the main air duct and is positioned between the evaporator and the condenser.
8. The heat pump drying system as claimed in claim 7, wherein the main air duct between the second heat exchanger and the condenser is communicated with one end of a bypass air duct, the other end of the bypass air duct is communicated with the return air duct, and the bypass air duct is provided with a first regulating valve.
9. The heat pump drying system of claim 6, wherein a heating pipe is disposed in the main air duct, and the heating pipe is disposed between the condenser and an air outlet of the main air duct.
10. The heat pump drying system of any one of claims 1 to 9, wherein a supply air blower is provided in the supply air duct, and a return air blower is provided in the return air duct.
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| CN202010653064.7A CN111678298A (en) | 2020-07-08 | 2020-07-08 | Heat pump drying system |
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| CN202010653064.7A CN111678298A (en) | 2020-07-08 | 2020-07-08 | Heat pump drying system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418324A (en) * | 2021-05-20 | 2021-09-21 | 青岛海尔空调电子有限公司 | Air source heat pump drying system and control method and control device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418324A (en) * | 2021-05-20 | 2021-09-21 | 青岛海尔空调电子有限公司 | Air source heat pump drying system and control method and control device thereof |
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