CN109163517B - Cereal storage device with stoving and cold millet function - Google Patents
Cereal storage device with stoving and cold millet function Download PDFInfo
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- CN109163517B CN109163517B CN201811166830.6A CN201811166830A CN109163517B CN 109163517 B CN109163517 B CN 109163517B CN 201811166830 A CN201811166830 A CN 201811166830A CN 109163517 B CN109163517 B CN 109163517B
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- 235000013339 cereals Nutrition 0.000 title claims abstract description 165
- 244000062793 Sorghum vulgare Species 0.000 title description 2
- 235000019713 millet Nutrition 0.000 title description 2
- 238000001035 drying Methods 0.000 claims abstract description 103
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 239000003507 refrigerant Substances 0.000 claims abstract description 6
- 239000000428 dust Substances 0.000 claims description 24
- 230000009471 action Effects 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 213
- 238000010981 drying operation Methods 0.000 description 9
- 239000012080 ambient air Substances 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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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
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B9/00—Preservation of edible seeds, e.g. cereals
- A23B9/08—Drying; Subsequent reconstitution
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/06—Grains, e.g. cereals, wheat, rice, corn
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
-
- 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
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Storage Of Harvested Produce (AREA)
Abstract
The invention discloses a grain storage device with drying and cereal cooling functions, which comprises a grain drying bin, a grain storage bin and a heat pump drying system, wherein the grain storage bin is connected with the heat pump drying system; the grain drying bin is connected with an air inlet channel and an air outlet channel, one end of the air outlet channel is connected with the grain drying bin, and the other end of the air outlet channel is connected with the grain storage bin; the heat pump drying system comprises at least one group of heat pump units, each heat pump unit comprises a compressor, a condenser, a throttling device and an evaporator which are connected to form a refrigerant circulation system, the condensers of the heat pump units are sequentially arranged in the air inlet channel, and the evaporators are sequentially arranged in the air outlet channel. According to the grain storage device provided by the invention, the grains in the grain drying bin 6 are dried by using the hot air obtained through the condenser, the grains in the grain storage bin are refrigerated by using the cold air generated through the evaporator, the grain drying and the grain refrigeration are integrated, the energy is fully recovered, the cost is greatly saved, the structure is compact, and the occupied space is small.
Description
Technical Field
The invention relates to the technical field of heat pump system design, in particular to a grain storage device with drying and cooling functions.
Background
Grains harvested in the fields in noon and autumn can be dried by adopting a heat pump unit to provide heat; the wet grains waiting to be dried in the drying center are required to be cooled, discharged and stored at low temperature, so that the hot and mildewed grains are prevented; the grains in storage are dried, and the grains are required to be cooled and discharged frequently for low-temperature storage, so that the ageing speed is reduced, and the quality and the taste of the grains are maintained.
The grain drying needs to be heated, which is an endothermic process; the grains are stored at low temperature and need to be subjected to heat removal and temperature reduction, so that an exothermic process is realized; the heat pump unit is essentially a refrigerating device, is a heat carrier, has the dual functions of heat absorption by the evaporator and heat release by the condenser, and technically has the realistic possibility that the heat pump unit can meet the two functions of high-temperature drying and low-temperature storage of grains at the same time or in a staggered manner;
how to integrate the drying and refrigerating equipment in the grain production process, the dual functions of high-temperature drying and low-temperature storage of the heat pump unit are exerted, the purposes of one machine for two purposes and one machine for three purposes of the heat pump unit are realized, the efficiency and the utilization rate of the heat pump unit are improved, and the grain drying and storage cost is reduced.
Disclosure of Invention
Aiming at the existing problems in the background art, the invention provides a grain storage device with drying and cooling functions, which comprises a grain drying bin, a grain storage bin and a heat pump drying system; an air inlet channel and an air outlet channel are connected to the grain drying bin, one end of the air outlet channel is connected with the grain drying bin, and the other end of the air outlet channel is connected with the grain storage bin;
the heat pump drying system comprises at least one group of heat pump units, wherein each heat pump unit comprises a compressor, a condenser, a throttling device and an evaporator which are connected to form a refrigerant circulation system, the condensers of the heat pump units are sequentially arranged in the air inlet channel, and the evaporators of the heat pump units are sequentially arranged in the air outlet channel.
Preferably, a first channel communicated with the outside is further arranged on the air inlet channel between the condenser and the grain drying bin;
and a first air flow switching air door is arranged at the joint of the first channel and the air inlet channel, and the air inlet channel is opened and the first channel is closed or the air inlet channel is closed and the first channel is opened by controlling the first air flow switching air door to rotate.
Preferably, a second channel communicated with the outside is further arranged on the air outlet channel between the evaporator and the grain drying bin;
and a second air flow switching air door is arranged at the joint of the second channel and the air outlet channel, and the air outlet channel is opened and closed or the air outlet channel is closed and the second channel is opened by controlling the second air flow switching air door to rotate.
Preferably, a first fan is arranged between the tail end of the air outlet channel and the grain storage bin, and the air in the air inlet channel and the air outlet channel is driven to flow under the action of the first fan.
Preferably, a third channel communicated with the outside is further arranged on the air outlet channel between the first fan and the grain storage bin; and a third air flow switching air door is arranged at the joint of the third channel and the air outlet channel, and the air outlet channel is opened and closed or the air outlet channel is closed and the third channel is opened by controlling the third air flow switching air door to rotate.
Preferably, the first fan adopts a high-pressure head and large-air-volume fan, the pressure of the first fan is more than or equal to 2000pa, and the air volume is more than or equal to 10000m 3 /h。
Preferably, a second fan is arranged at the outlet of the first channel.
Preferably, a dust remover is arranged on one side of the air outlet channel, which is close to the grain drying bin.
Preferably, the air outlet channel conveys air to the bottom of the grain storage bin, and the air permeates upwards from the bottom of the grain storage bin.
Preferably, a plurality of parallel conveying pipes are arranged at the bottom of the grain storage bin, a plurality of air outlet holes are uniformly distributed on the conveying pipes, and the air outlet channel conveys air into each conveying pipe and conveys the air into the grain storage bin through the air outlet holes.
Compared with the prior art, the invention has the following advantages and positive effects due to the adoption of the technical scheme:
according to the grain storage device provided by the invention, the grains in the grain drying bin 6 are dried by using the hot air obtained through the condenser, the grains in the grain storage bin are refrigerated by using the cold air generated through the evaporator, the grain drying and the grain refrigeration are integrated, the energy is fully recovered, the cost is greatly saved, the structure is compact, and the occupied space is small.
Drawings
The above and other features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a grain storage device with drying and cooling functions according to the present invention;
FIG. 2 is a vertical cross-sectional view of the grain storage silo of the present invention;
FIG. 3 is a schematic view of a grain storage silo of the present invention in transverse semi-section;
fig. 4 is a schematic diagram of a grain storage device with drying and cooling functions in a drying operation state according to the present invention;
FIG. 5 is a graph showing the pressure values of air flowing through the components in the state of FIG. 4;
fig. 6 is a schematic diagram of a grain storage device with drying and cooling functions in a cooling operation state according to the present invention;
FIG. 7 is a graph showing the pressure values of air flowing through the components in the state of FIG. 6;
fig. 8 is a schematic diagram of a grain storage device with drying and cooling functions in a combined drying and cooling operation state according to the present invention.
Detailed Description
The invention will be described in more detail hereinafter with reference to the accompanying drawings showing embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.
Referring to fig. 1-3, the present invention provides a grain storage device with drying and cooling functions, comprising a grain drying bin 6, a grain storage bin 15 and a heat pump drying system; the grain drying bin 6 is connected with an air inlet channel 1 and an air outlet channel 11, one end of the air outlet channel 11 is connected with the grain drying bin 6, and the other end is connected with a grain storage bin 15. The heat pump drying system comprises at least one group of heat pump units, wherein each heat pump unit comprises a compressor 16, a condenser 2, a throttling device 17 and an evaporator 18 which are connected to form a refrigerant circulation system, the condensers of the heat pump units are sequentially arranged in the air inlet channel 1, and the evaporators are sequentially arranged in the air outlet channel.
According to the grain storage device provided by the invention, the grains in the grain drying bin 6 are dried by using the hot air obtained through the condenser, the grains in the grain storage bin are refrigerated by using the cold air generated through the evaporator, the grain drying and the grain refrigeration are integrated, the energy is fully recovered, the cost is greatly saved, the structure is compact, and the occupied space is small.
In this embodiment, the grain drying bin 6 is typically a circulating grain dryer, and is composed of a sheet metal shell, a grain drying section structure, and a lifter. Of course, in other embodiments, the specific structure of the grain drying bin 6 may be adjusted according to the specific situation, which is not limited herein.
In this embodiment, the number of heat pump units included in the heat pump drying system may be adjusted according to specific situations, which is not limited herein. For example, as shown in fig. 1, the heat pump drying system includes three heat pump units, and three condensers are arranged in the opposite direction to the three evaporators with respect to the air flow direction.
In this embodiment, a dust remover 8 is disposed on the air outlet channel 11 near the grain drying chamber 6, for removing dust and impurities in the air discharged from the grain drying chamber 6, and avoiding entering the grain storage chamber 15.
Further, the dust remover 8 is usually a cyclone and filter cartridge combined dust remover, and is formed by connecting a cyclone dust remover and a filter cartridge group dust remover in series, wherein the cyclone dust remover is arranged in front, and the filter cartridge group dust remover is arranged in rear; of course, in other embodiments, the specific structure of the dust collector 8 may be adjusted according to the specific situation, which is not limited herein.
In this embodiment, a first fan 12 is disposed between the end of the air outlet channel 11 and the grain storage bin 15, and the air in the air inlet channel 1 and the air outlet channel 11 is driven to flow by the first fan 12. The first fan 12 in this embodiment is a power source of the air path, specifically an evaporator centrifugal fan disposed behind the evaporator for providing the air path power of the whole system during the grain drying operation; meanwhile, the first fan 12 is also a power source for cold air generated by the evaporator to penetrate the grain pile when the grain cooling machine is operated.
Further, the first fan 12 adopts a fan with high pressure head and large air volume, the pressure of the first fan is more than or equal to 2000pa, and the air volume is more than or equal to 10000m3/h. The evaporator centrifugal fan has the characteristics of high pressure head (more than or equal to 2000 pa) and large air volume (more than or equal to 10000m 3/h): (1) when the grain drying operation is performed, the evaporator centrifugal fan is full system air path power, ambient air is pulled to flow through the condenser group in sequence to be heated into dry air, flows through the drying section of the dryer to be subjected to heat-moisture exchange with wet grains, flows through the dust remover to remove dust, flows through the evaporator group to cool and dehumidify to leave heat, at the moment, the evaporator centrifugal fan does work on air flow at the air suction inlet, and negative pressure below-2000 pa relative to atmospheric pressure is generated at the air suction inlet; (2) when the cooling grain runs, the evaporator centrifugal fan is the power for cold air to penetrate through the grain pile, at the moment, the evaporator centrifugal fan mainly works on air flow at the air outlet of the centrifugal fan, positive pressure which is higher than +2000pa relative to atmospheric pressure is generated at the air outlet, and the cold air generated by the evaporator is pushed to penetrate through the grain pile.
In this embodiment, the grain storage apparatus further includes a condenser axial flow fan disposed after the condenser and dedicated to cool Gu Shi condenser operation.
In the embodiment, a first channel 3 communicated with the outside is further arranged on the air inlet channel 1 between the condenser 2 and the grain drying bin 6; and the junction of the first channel 3 and the air inlet channel 1 is provided with a first air flow switching air door 7, and the air inlet channel 1 is opened and the first channel 3 is closed or the air inlet channel 1 is closed and the first channel 3 is opened by controlling the first air flow switching air door to rotate.
Further, a second fan 5 is arranged at the outlet of the first channel 3, and the second fan 5 is used for promoting air in the air inlet channel 1 to flow out of the first channel 3.
In the embodiment, a second channel 10 communicated with the outside is also arranged on the air outlet channel 11 between the evaporator and the grain drying bin 6; and the second air flow switching air door 9 is arranged at the joint of the second channel 10 and the air outlet channel 11, and the air outlet channel 11 is opened by controlling the second air flow switching air door 9 to rotate, or the air outlet channel 11 is closed, and the second channel 10 is opened.
In the embodiment, a third channel 13 communicated with the outside is further arranged on the air outlet channel 11 between the first fan 12 and the grain storage bin 15; and the connection part of the third channel 13 and the air outlet channel 11 is provided with a third air flow switching air door 14, and the air outlet channel 11 is opened by controlling the third air flow switching air door 14 to rotate, or the air outlet channel 11 is closed, and the third channel 13 is opened.
In this embodiment, through the arrangement of the first channel 3, the first airflow switching air door 7, the second channel 10, the second airflow switching air door 9, the third channel 13, and the third airflow switching air door 14, the grain storage device realizes multiple functions, and specifically has the following 3 operation modes:
1. drying operation
Referring to fig. 4-5, the first air flow switching damper 7 is controlled to open the air inlet channel 1 and close the first channel 3; controlling the second air flow switching air door 9 to open the air outlet channel 11 and close the second channel 10; the third air flow switching air door 14 is controlled to open the third channel 13, close the air inlet channel behind the first fan 12, open the air outlet of the first fan to the ambient atmosphere, and close the air outlet of the air channel at the bottom of the grain pile.
During the drying operation, the wet grains loaded into the circulating grain drying bin 6 continuously and slowly pass through the drying section of the grain drying bin 6 under the action of a lifter, and the grain drying circulation is started; the evaporator group absorbs heat from the air outlet of the grain drying bin 6, and the condenser group heats the dry fresh air; the heated fresh air passes through a drying section of the grain drying bin 6, and the wet grains are heated in the drying section to evaporate moisture in the grains into water vapor to form warm and humid air flow which is discharged out of the grain drying bin 6; the warm wet air discharged from the grain drying bin 6 enters the dust remover 8, the warm wet air filtered dust in the dust remover 8 enters the evaporator set again to cool and dehumidify to release heat, and the released heat is conveyed to the heat pump condenser again through the closed cycle of the heat carrier refrigerant to start a new round of heat circulation.
During the grain drying operation, the first fan 12 is full-system air path power, pulls ambient air to flow through the condenser group in sequence to be heated into dry air, flows through the drying section of the grain drying bin 6 to perform heat-moisture exchange with wet grains, flows through the dust remover to remove dust, flows through the evaporator group to cool and dehumidify to leave heat, and at the moment, the first fan 12 does work on air flow at the air suction inlet, and generates negative pressure below-2000 pa relative to atmospheric pressure at the air suction inlet.
2. Run on cool grains
Referring to fig. 6 to 7, the first air flow switching damper 7 is controlled to close the air inlet channel 1 and open the first channel 3, so that the hot air generated after condensation is directly discharged into the outside air; controlling the second air flow switching air door 9 to close the air outlet channel 11 and open the second channel 10, and directly adopting external air to flow through the evaporator set; the third air flow switching air door 14 is controlled to close the third channel 13, the air inlet channel behind the first fan 12 is opened, the air outlet of the centrifugal fan to the ambient atmosphere is closed, and the air outlet of the air channel at the bottom of the grain pile is opened.
Before the cold valley operation, the invention firstly adjusts and switches the connection air duct of the drying operation, the air duct after the switching directly discharges the air outlet of the condenser group of the heat pump unit into the ambient atmosphere, the suction inlet of the evaporator group is connected into the ambient atmosphere, the first fan behind the evaporator group is adjusted from doing work on the suction air flow at the suction inlet to doing work on the exhaust air flow at the discharge outlet, and the production high pressure is low Wen Lianggu to output air flow;
when the invention is in cold valley operation, the suction inlet of the evaporator group is connected to the ambient atmosphere, so that the first fan 12 behind the evaporator group does work on the suction air flow at the suction inlet to do work on the exhaust air flow at the exhaust outlet when in drying operation, and high-pressure low-temperature output air flow is produced; the low-temperature air which is cooled and dehumidified by the heat pump evaporator group is injected into a connecting air duct and an airflow distributor at the lower part of the grain pile of the grain depot by the centrifugal fan of the evaporator; after passing through the air flow distributor with large ventilation sectional area at the bottom of the grain pile, the low-temperature air infiltrates into the grain pile layer from bottom to top, absorbs the heat of the grains, becomes warm air, escapes from the top of the grain pile, and cools the grains.
When the cooling valley runs, the first fan 12 is the power for cold air to penetrate through the valley pile, at this time, the centrifugal fan of the evaporator mainly works on air flow at the air outlet of the centrifugal fan, positive pressure which is more than +2000pa relative to the atmospheric pressure is generated at the air outlet, and the cold air generated by the evaporator is pushed to penetrate through the valley pile.
3. Drying and cooling grain combined operation
Referring to fig. 8, the first air flow switching damper 7 is controlled to open the air inlet channel 1 and close the first channel 3; controlling the second air flow switching air door 9 to open the air outlet channel 11 and close the second channel 10; the third air flow switching air door 14 is controlled to close the third channel 13, the air inlet channel behind the first fan 12 is opened, the air outlet of the centrifugal fan to the ambient atmosphere is closed, and the air outlet of the air channel at the bottom of the grain pile is opened.
When the grain drying and cooling combined operation is performed, the first fan 12 does work at the suction inlet to generate negative pressure and does work at the discharge outlet to generate positive pressure, meanwhile, the air supply path is the drying air flow of the environment atmosphere-condenser group-grain drying bin drying section-dust remover-evaporator group, and the air flow path is the cool Gu Qiliu connected with the air duct-air flow distributor-grain pile to provide a power source for overcoming the resistance along the air flow; the heat circulation of grain drying is that the heat pump evaporator absorbs heat from the air outlet of the dryer, and the heat pump condenser group heats the fresh air for drying; the heated fresh air passes through a drying section of the dryer, and the wet grains are heated in the drying section to evaporate moisture in the grains into water vapor to form warm and wet air flow which is discharged out of the dryer; the warm wet air discharged from the dryer enters a dust remover, the warm wet air filtered dust in the dust remover enters a heat pump evaporator again to cool, dehumidify and release heat to become low-temperature cold air, the released heat is conveyed to a heat pump condenser again through closed cycle of a heat carrier refrigerant, and a new heat cycle is started; the cool grains just use low-temperature air generated by cooling and dehumidifying through the heat pump evaporator group, the low-temperature air is injected into a connecting air duct at the lower part of the grain pile of the grain depot by the evaporator centrifugal fan, and after passing through an air flow distributor with large ventilation sectional area at the bottom of the grain pile, the cool grains infiltrate into the grain pile layer at a low speed from bottom to top, absorb the heat of the grains, become warm air and escape from the top of the grain pile, so that the cooling and cooling of the grains are realized.
In this embodiment, the air outlet channel 11 delivers air to the bottom of the grain storage bin 15, from where it permeates upward.
Further, as shown in fig. 2-3, a plurality of parallel conveying pipes 19 are arranged at the bottom of the grain storage bin 15, a plurality of air outlet holes 20 are uniformly distributed on the conveying pipes 19, and the air outlet channel 11 conveys air into each conveying pipe 19 and into the grain storage bin 15 through the air outlet holes 20.
The heat pump combination device with dual functions of drying and cooling provided by the invention has the following advantages:
1. switching of heat pump unit drying working condition to cold valley working condition is reliably realized
In order to realize quick and efficient drying, under the drying working condition of 70 ℃ of air outlet, the enthalpy difference of the air outlet at the condenser side of the heat pump unit reaches about 50kj/kg, and the enthalpy difference of the air outlet at the evaporator side reaches as high as 35kj/kg; under the condition of cold Gu Gongkuang, the temperature of the ambient air at about 25 ℃ is reduced to be about 100 percent of the temperature of the ambient air at about 5 ℃, the enthalpy difference is about 37kj/kg, and the ambient air is close to the inlet and outlet enthalpy difference of the evaporator under the drying working condition;
according to the heat pump combined device with dual functions of drying and cooling, when in cooling Gu Yun, the cooling capacity of the operation dryer unit is started according to the enthalpy difference requirement that the ambient air is dehumidified and cooled to 100% of 5 ℃ through detecting the temperature and the humidity of the ambient air, so that the switching of the drying working condition of the heat pump unit to the cooling working condition is reliably realized;
2. reliably realizes the switching of the air path working condition of the heat pump unit between the drying and the cold valley
The heat pump combined device with dual functions of drying and cooling adopts the evaporator centrifugal fan with the characteristics of high pressure head (more than or equal to 2000 pa) and large air quantity (more than or equal to 10000m < 3 >/h), and reliably realizes the switching of the air path working condition of the heat pump unit between the drying and cooling: (1) when the grain drying operation is performed, the evaporator centrifugal fan is full system air path power, ambient air is pulled to flow through the condenser group in sequence to be heated into dry air, flows through the drying section of the dryer to be subjected to heat-moisture exchange with wet grains, flows through the dust remover to remove dust, flows through the evaporator group to cool and dehumidify to leave heat, at the moment, the evaporator centrifugal fan does work on air flow at the air suction inlet, and negative pressure below-2000 pa relative to atmospheric pressure is generated at the air suction inlet; (2) when the cooling grain runs, the evaporator centrifugal fan is the power for cold air to penetrate through the grain pile, at the moment, the evaporator centrifugal fan mainly works on air flow at an air outlet of the centrifugal fan, positive pressure which is more than +2000pa relative to atmospheric pressure is generated at an air outlet, and the cold air generated by the evaporator is pushed to penetrate through the grain pile;
3. efficiency and utilization rate of heat pump unit are improved
The heat pump combined device with dual functions of drying and cooling integrates grain drying and grain refrigerating equipment in the grain production process, plays the dual functions of high-temperature drying and low-temperature storage of the heat pump unit, realizes the dual purposes of one machine and three machines of the heat pump unit, improves the efficiency and the utilization rate of the heat pump unit, and greatly reduces the grain drying and storage cost.
It will be appreciated by those skilled in the art that the invention can be embodied in many other specific forms without departing from the spirit or scope thereof. Although embodiments of the present invention have been described, it is to be understood that the present invention should not be limited to these embodiments, but that variations and modifications can be made by one skilled in the art within the spirit and scope of the present invention as hereinafter defined in the appended claims.
Claims (10)
1. The grain storage device with the drying and cereal cooling functions is characterized by comprising a grain drying bin, a grain storage bin and a heat pump drying system; an air inlet channel and an air outlet channel are connected to the grain drying bin, one end of the air outlet channel is connected with the grain drying bin, and the other end of the air outlet channel is connected with the grain storage bin;
the heat pump drying system comprises at least one group of heat pump units, wherein each heat pump unit comprises a compressor, a condenser, a throttling device and an evaporator which are connected to form a refrigerant circulation system, the condensers of the heat pump units are sequentially arranged in the air inlet channel, and the evaporators of the heat pump units are sequentially arranged in the air outlet channel.
2. The grain storage device with drying and cooling functions according to claim 1, wherein a first channel communicated with the outside is further provided on an air inlet channel between the condenser and the grain drying bin;
and a first air flow switching air door is arranged at the joint of the first channel and the air inlet channel, and the air inlet channel is opened and the first channel is closed or the air inlet channel is closed and the first channel is opened by controlling the first air flow switching air door to rotate.
3. The grain storage device with drying and cooling functions according to claim 2, wherein a second channel communicated with the outside is further provided on an air outlet channel between the evaporator and the grain drying bin;
and a second air flow switching air door is arranged at the joint of the second channel and the air outlet channel, and the air outlet channel is opened and closed or the air outlet channel is closed and the second channel is opened by controlling the second air flow switching air door to rotate.
4. A grain storage device with drying and cooling functions according to claim 1, 2 or 3, wherein a first fan is arranged between the tail end of the air outlet channel and the grain storage bin, and the air in the air inlet channel and the air outlet channel is driven to flow by the action of the first fan.
5. The grain storage device with drying and cooling functions according to claim 4, wherein a third channel communicated with the outside is further arranged on the air outlet channel between the first fan and the grain storage bin; and a third air flow switching air door is arranged at the joint of the third channel and the air outlet channel, and the air outlet channel is opened and closed or the air outlet channel is closed and the third channel is opened by controlling the third air flow switching air door to rotate.
6. The grain storage device with drying and cooling functions according to claim 4, wherein the first fan is a high-pressure-head high-air-volume fan, the pressure of the first fan is more than or equal to 2000pa, and the air volume is more than or equal to 10000m 3 /h。
7. The grain storage device with drying and cooling functions of claim 2, wherein a second fan is provided at an outlet of the first passage.
8. The grain storage device with drying and cooling functions according to claim 1, wherein a dust remover is arranged on one side of the air outlet channel, which is close to the grain drying bin.
9. The grain storage device with drying and cooling functions of claim 1, wherein the air outlet channel delivers air to the bottom of the grain storage bin, from where it permeates upward.
10. The grain storage device with drying and cooling functions according to claim 9, wherein a plurality of parallel conveying pipes are arranged at the bottom of the grain storage bin, a plurality of air outlet holes are uniformly distributed on the conveying pipes, and the air outlet channel conveys air into each conveying pipe and into the grain storage bin through the air outlet holes.
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| CN201811166830.6A CN109163517B (en) | 2018-09-30 | 2018-09-30 | Cereal storage device with stoving and cold millet function |
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| CN201811166830.6A CN109163517B (en) | 2018-09-30 | 2018-09-30 | Cereal storage device with stoving and cold millet function |
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| CN109682201B (en) * | 2019-02-12 | 2024-02-13 | 农业农村部南京农业机械化研究所 | Air energy grain drying, refrigerating and energy-saving integrated device and intelligent control method thereof |
| CN110332781A (en) * | 2019-07-12 | 2019-10-15 | 安徽宏润工业设备安装有限公司 | A kind of drying device recycled |
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| CN109163517A (en) | 2019-01-08 |
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