CN110595196A - Small-size high-efficient dehumidification heat pump drying device - Google Patents
Small-size high-efficient dehumidification heat pump drying device Download PDFInfo
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- CN110595196A CN110595196A CN201910779361.3A CN201910779361A CN110595196A CN 110595196 A CN110595196 A CN 110595196A CN 201910779361 A CN201910779361 A CN 201910779361A CN 110595196 A CN110595196 A CN 110595196A
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- thermoelectric module
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- heat exchanger
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- 238000001035 drying Methods 0.000 title claims abstract description 87
- 238000007791 dehumidification Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000009833 condensation Methods 0.000 claims abstract description 23
- 230000005494 condensation Effects 0.000 claims abstract description 23
- 238000001704 evaporation Methods 0.000 claims abstract description 22
- 230000008020 evaporation Effects 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000003912 environmental pollution Methods 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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
- F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
- F26B23/005—Heating arrangements using waste heat recovered from dryer exhaust gases using a closed cycle heat pump system ; using a heat pipe system
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A small-sized high-efficiency dehumidifying heat pump drying device comprises a sealed drying chamber, a heat pipe heat exchanger, a thermoelectric module and a heat pump, wherein the heat pump comprises an expansion valve, an evaporator, a compressor, a first condenser and a second condenser which are sequentially communicated through pipelines to form a loop; the drying chamber is provided with an air inlet and an air outlet which are communicated through a drying channel, and a circulating fan is arranged in the drying channel; the evaporator is arranged at one side close to the air outlet in the drying channel, and the first condenser and the second condenser are arranged at one side close to the air inlet in the drying channel; a baffle plate is arranged in the drying channel, an evaporation section of the heat pipe heat exchanger, a cold end of the thermoelectric module, a hot end of the thermoelectric module and a condensation section of the heat pipe heat exchanger are sequentially arranged along the air advancing direction, and the evaporator is arranged between the hot end of the thermoelectric module and the condensation section of the heat pipe heat exchanger; the drying channel is provided with a water outlet below the cold end of the thermoelectric module. The invention can dehumidify the air and reduce the relative humidity of the air, thereby achieving the purpose of high-efficiency dehumidification and drying.
Description
Technical Field
The invention relates to the technical field of drying equipment, in particular to a small efficient dehumidifying heat pump drying device.
Background
Drying has been widely applied to aspects such as grain, fruit, timber, aquatic products, and traditional drying mode has the problem such as lower efficiency, great energy consumption and environmental pollution. Heat pump drying has significant advantages over other drying methods such as: environment protection, high efficiency, energy saving, high heat efficiency, fast dehumidification, good quality and color of the dried articles, and the like. However, the drying process is a very complex process involving a very complex heat and mass transfer mechanism, and may even involve certain biochemical reaction processes. The drying rate of the heat pump mainly depends on the inlet air temperature of the drying chamber, the higher the inlet air temperature is, the faster the drying rate is, the water vapor partial pressure of the inlet air of the drying chamber in the later period of drying is a main factor influencing the drying in the whole later period, and the lower the water vapor partial pressure is, the faster the drying rate is. From the aspect of heat and mass transfer, the higher inlet air temperature is needed in the early drying period, and the higher drying temperature and the lower relative humidity of the air are needed in the later drying period. The existing heat pump drying equipment is not improved according to the inlet air temperature.
In view of the above, the present application is directed to a small-sized and efficient dehumidification heat pump drying device.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a small efficient dehumidification heat pump drying device, which achieves the purpose of efficient dehumidification and drying by improving the inlet air temperature of a drying chamber and reducing the relative humidity of inlet air.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a small-sized high-efficiency dehumidifying heat pump drying device comprises a sealed drying chamber, a heat pipe heat exchanger, a thermoelectric module and a heat pump, wherein the heat pump comprises an expansion valve, an evaporator, a compressor, a first condenser and a second condenser which are sequentially communicated through pipelines to form a loop, and the evaporator, the first condenser and the second condenser are respectively fin type heat exchangers; the drying chamber is provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated through a drying channel, and a circulating fan which blows air from the air outlet side to the air inlet side is arranged in the drying channel; the evaporator is arranged at one side close to the air outlet in the drying channel, and the first condenser and the second condenser are arranged at one side close to the air inlet in the drying channel; a baffle plate is arranged in the drying channel, the heat pipe heat exchanger and the thermoelectric module are arranged on the baffle plate, an evaporation section and a condensation section of the heat pipe heat exchanger are respectively positioned at two sides of the baffle plate, a hot end and a cold end of the thermoelectric module are respectively positioned at two sides of the baffle plate, the evaporation section of the heat pipe heat exchanger, the cold end of the thermoelectric module, the hot end of the thermoelectric module and the condensation section of the heat pipe heat exchanger are sequentially arranged along the air advancing direction, and the evaporator is arranged between the hot end of the; the drying channel is provided with a water outlet below the cold end of the thermoelectric module.
By last knowing, when using, the air is dried by the drying object in the drying chamber behind the drying chamber, and the air that comes out in the drying chamber has become the high humid air of relative microthermal, then passes through heat pipe heat exchanger evaporation zone release heat earlier, has also carried out heat recovery for the first time, and when heat pipe heat exchanger evaporation zone's hot-blast temperature was higher, corresponding heat pipe heat exchanger condensation zone's hot-blast temperature just also was higher, through the air behind heat pipe heat exchanger evaporation zone, has also carried out cooling for the first time. The air comes out the back from heat pipe exchanger evaporation zone, and then through the thermoelectric module cold junction and by the cooling, lead to the air temperature further to be close condensation point temperature, reduce to condensation point again along with the temperature, moisture in the air can condense into the drop of water at the thermoelectric module cold junction, finally drip on the divergent passageway, can flow along divergent passageway slope and drain away to the outlet, comdenstion water in the air can flow along dry passageway and drain away to the outlet, make partial steam condensate drop and drain away in the air through cooling down once more, from the relative humidity who reduces the inlet air, consequently, thermoelectric module can realize the dehumidification of air and reduce the relative humidity of air. The air is heated and heated through the hot end of the thermoelectric module, the temperature of the evaporator is increased through the evaporator after the air is heated and heated, meanwhile, the air can be cooled again, the temperature of the air before entering the evaporator can be controlled, the temperature of the evaporator of the heat pump is controlled, and the temperature of the condenser of the heat pump is controlled. When the air superheating pipe heat exchanger condensation section, the heat pipe heat exchanger condensation section can release the heat of retrieving from heat pipe heat exchanger evaporation section for the air, then the air can be heated and heaied up to the temperature before the air gets into the condenser has been improved, from the analysis of heat transfer angle, the rising of air inlet temperature divide into first condenser and second condenser with the heat pump system condenser simultaneously, combines the heat exchange mode against the current, will improve the air-out temperature, and reach high-efficient dehumidification drying's purpose.
In conclusion, the invention condenses part of water vapor in the air into water drops and discharges the water drops through cooling again, so that the thermoelectric module can dehumidify the air and reduce the relative humidity of the air, and the drying rate is faster when the water vapor pressure in the air is lower; meanwhile, the air is heated before passing through the evaporator, so that the temperature of the evaporator of the heat pump is increased, namely the temperature of the condenser of the heat pump is controlled; and finally, before the air enters the condenser, the air is heated by the condensation section of the heat pipe heat exchanger, the heat transfer angle is analyzed, the inlet air temperature is increased, the condenser of the heat pump system is divided into a first condenser and a second condenser, and the outlet air temperature can be increased by combining a countercurrent heat exchange mode, so that the aim of efficient dehumidification and drying is fulfilled.
The drying channel is characterized in that the number of the thermoelectric modules is N, the N thermoelectric modules are arranged side by side, the N thermoelectric modules sequentially comprise a first thermoelectric module, a second thermoelectric module, a third thermoelectric module and an Nth thermoelectric module along the air flow direction, a tapered channel from an evaporation section of the heat pipe heat exchanger to the cold end of the first thermoelectric module is arranged on the inner wall of the drying channel, a tapered channel from the cold end of the first thermoelectric module to the cold end of the Nth thermoelectric module is arranged on the inner wall of the drying channel below the N thermoelectric modules, and a water outlet is arranged below the cold end of the Nth thermoelectric module.
Compared with the prior art, the technical scheme of the invention has the following innovation points and beneficial effects:
according to the invention, partial water vapor in the air is condensed into water drops and discharged through cooling again, so that the thermoelectric module can dehumidify the air and reduce the relative humidity of the air, and the lower the relative humidity of the air is, the lower the water vapor pressure in the air is, and the faster the drying rate is;
by designing a proper gradually-reducing and gradually-expanding channel, the thermoelectric efficiency of the previous stages of thermoelectric modules can be improved, certain energy-saving capability is achieved, and meanwhile, the drainage of condensed water is facilitated.
In addition, by regulating and controlling the input power of the thermoelectric device, dehumidification can be realized, the temperature of air entering the evaporator can be controlled, and great flexibility is provided for controlling the air supply temperature of the condenser or the drying chamber;
meanwhile, the temperature of the air is increased before the air passes through the evaporator, so that the temperature of the evaporator of the heat pump is increased, namely the temperature of the condenser of the heat pump is controlled;
finally, the air is heated up through the condensation section of the heat pipe exchanger before entering the condenser, the heat transfer angle analysis shows that the inlet air temperature is increased, the condenser of the heat pump system is divided into a first condenser and a second condenser, the outlet air temperature can be increased by combining a countercurrent heat exchange mode, and the purposes of efficient dehumidification and drying are achieved
Drawings
Fig. 1 is a schematic diagram of a small-sized high-efficiency dehumidifying heat pump drying device according to the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
Examples
Referring to fig. 1, a small-sized high-efficiency dehumidifying heat pump drying device includes a sealed drying chamber 10, a heat pipe exchanger 30, a thermoelectric module 40 and a heat pump, wherein the heat pump includes an expansion valve 61, an evaporator 62, a compressor 63, a first condenser 64 and a second condenser 65 which are sequentially communicated through a pipeline to form a loop, and the evaporator 62, the first condenser 64 and the second condenser 65 are respectively fin-type heat exchangers;
the drying chamber 10 is provided with an air inlet 11 and an air outlet 12, the air inlet 11 and the air outlet 12 are communicated through a drying channel 20, and a circulating fan 50 which blows air from the air outlet side to the air inlet side is arranged in the drying channel 20;
the evaporator 62 is arranged at one side of the drying channel 20 close to the air outlet 12, and the first condenser 64 and the second condenser 65 are arranged at one side of the drying channel 20 close to the air inlet 11;
a baffle plate 21 is arranged in the drying channel 20, the heat pipe heat exchanger 30 and the thermoelectric module 40 are arranged on the baffle plate 21, an evaporation section and a condensation section of the heat pipe heat exchanger 30 are respectively positioned at two sides of the baffle plate 21, a hot end and a cold end of the thermoelectric module 40 are respectively positioned at two sides of the baffle plate 21, the evaporation section of the heat pipe heat exchanger 30, the cold end of the thermoelectric module 40, the hot end of the thermoelectric module 40 and the condensation section of the heat pipe heat exchanger 30 are sequentially arranged along the air advancing direction, and the evaporator 62 is arranged between the hot end of the thermoelectric module 40;
drying tunnel 20 has drain 22 below the cold side of thermoelectric module 40.
By last knowing, when using, the air is dried by the drying object in the drying chamber behind the drying chamber, and the air that comes out in the drying chamber has become the high humid air of relative microthermal, then passes through heat pipe heat exchanger evaporation zone release heat earlier, has also carried out heat recovery for the first time, and when heat pipe heat exchanger evaporation zone's hot-blast temperature was higher, corresponding heat pipe heat exchanger condensation zone's hot-blast temperature just also was higher, through the air behind heat pipe heat exchanger evaporation zone, has also carried out cooling for the first time. The air comes out the back from heat pipe exchanger evaporation zone, and then by the cooling through the thermoelectric module cold junction, lead to air temperature further to be close condensation point temperature, reduce to condensation point once more along with the temperature, moisture in the air can condense into the drop of water at the thermoelectric module cold junction, finally drip on the divergent passageway, can flow along divergent passageway slope and drain away to the outlet, make partial vapor condensation water drop in the air and drain away through cooling once more, from the relative humidity who reduces air inlet, consequently, thermoelectric module can realize the dehumidification and the relative humidity who reduces the air to the air. The air is heated and heated through the hot end of the thermoelectric module, the temperature of the evaporator is increased through the evaporator after the air is heated and heated, meanwhile, the air can be cooled again, the temperature of the air before entering the evaporator can be controlled, the temperature of the evaporator of the heat pump is controlled, and the temperature of the condenser of the heat pump is controlled. When the air superheating pipe heat exchanger condensation section, the heat pipe heat exchanger condensation section can release the heat of retrieving from heat pipe heat exchanger evaporation section for the air, then the air can be heated and heaied up to the temperature before the air gets into the condenser has been improved, from the analysis of heat transfer angle, the rising of air inlet temperature divide into first condenser and second condenser with the heat pump system condenser simultaneously, combines the heat exchange mode against the current, will improve the air-out temperature, and reach high-efficient dehumidification drying's purpose.
In summary, in the invention, part of the water vapor in the air is condensed into water drops and discharged through cooling again, so that the thermoelectric module can dehumidify the air and reduce the relative humidity of the air, and the lower the relative humidity of the air is, the lower the pressure of the water vapor in the air is, and the faster the drying rate is; in addition, by regulating and controlling the input power of the thermoelectric device, dehumidification can be realized, the temperature of air entering the evaporator can be controlled, and great flexibility is realized; meanwhile, the air is heated before passing through the evaporator, so that the temperature of the evaporator of the heat pump is increased, namely the temperature of the condenser of the heat pump is controlled; and finally, before the air enters the condenser, the air is heated by the condensation section of the heat pipe heat exchanger, the heat transfer angle is analyzed, the inlet air temperature is increased, the condenser of the heat pump system is divided into a first condenser and a second condenser, and the outlet air temperature can be increased by combining a countercurrent heat exchange mode, so that the aim of efficient dehumidification and drying is fulfilled.
In this embodiment, the number of the thermoelectric modules 40 is N, the N thermoelectric modules 40 are arranged side by side, the N thermoelectric modules 40 are sequentially a first thermoelectric module, a second thermoelectric module, a third thermoelectric module and an nth thermoelectric module along the air flowing direction, a tapered channel 24 from the evaporation section of the heat pipe heat exchanger 30 to the cold end of the first thermoelectric module is arranged on the inner wall of the drying channel 20, a tapered channel 23 from the cold end of the first thermoelectric module to the cold end of the nth thermoelectric module is arranged on the inner wall of the drying channel 20 below the N thermoelectric modules 40, and a water outlet 22 is arranged below the cold end of the nth thermoelectric module in the drying channel 20.
When air enters the space between the cold end of the first thermoelectric module and the cold end of the Nth thermoelectric module after coming out from the evaporation section of the heat pipe exchanger, the aperture of the drying channel is gradually contracted between the evaporation section of the heat pipe exchanger and the cold end of the first thermoelectric module, so that the air speed is rapidly increased, the air can be rapidly and simultaneously subjected to primary cooling through the cold ends of the first thermoelectric module and the second thermoelectric module, and small water vapor in the air reaches the condensation point temperature and is condensed. The tapered and diverging passages are provided to allow air to rapidly pass through the cold sides of the first and second thermoelectric modules, and the time for staying at the cold ends of the third thermoelectric module and the Nth thermoelectric module is longer, so that the energy consumption of the cold ends of the first thermoelectric module and the second thermoelectric module can be reduced, thereby improving the performance of the first thermoelectric module and the second thermoelectric module, simultaneously ensuring most of water vapor in the air to be condensed when the cold ends of the third thermoelectric module and the Nth thermoelectric module are connected, the hot ends of the N thermoelectric modules simultaneously heat the air to effectively improve the temperature of the air before the air passes through the evaporator, namely the temperature of the evaporator and the condenser of the heat pump, and secondly, the temperature of air before entering the evaporator can be controlled by adjusting the working states of the N thermoelectric modules, so that the temperature of the evaporator of the heat pump is controlled, namely the temperature of the condenser of the heat pump is controlled. Specifically, in the present embodiment, the number of the thermoelectric modules 40 is 4, and many thermoelectric modules may be provided, and the number of the thermoelectric modules is determined according to the actual maximum dehumidification amount.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (2)
1. The utility model provides a small-size high-efficient dehumidification heat pump drying device which characterized in that: the system comprises a sealed drying chamber, a heat pipe heat exchanger, a thermoelectric module and a heat pump, wherein the heat pump comprises an expansion valve, an evaporator, a compressor, a first condenser and a second condenser which are sequentially communicated through a pipeline to form a loop, and the evaporator, the first condenser and the second condenser are respectively fin type heat exchangers; the drying chamber is provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated through a drying channel, and a circulating fan which blows air from the air outlet side to the air inlet side is arranged in the drying channel; the evaporator is arranged at one side close to the air outlet in the drying channel, and the first condenser and the second condenser are arranged at one side close to the air inlet in the drying channel; a baffle plate is arranged in the drying channel, the heat pipe heat exchanger and the thermoelectric module are arranged on the baffle plate, an evaporation section and a condensation section of the heat pipe heat exchanger are respectively positioned at two sides of the baffle plate, a hot end and a cold end of the thermoelectric module are respectively positioned at two sides of the baffle plate, the evaporation section of the heat pipe heat exchanger, the cold end of the thermoelectric module, the hot end of the thermoelectric module and the condensation section of the heat pipe heat exchanger are sequentially arranged along the air advancing direction, and the evaporator is arranged between the hot end of the; the drying channel is provided with a water outlet below the cold end of the thermoelectric module.
2. The drying apparatus of claim 1, wherein: the quantity of thermoelectric module is N, and N thermoelectric module sets up side by side, and N thermoelectric module is first thermoelectric module, second thermoelectric module, third thermoelectric module and N thermoelectric module along the air flow direction in proper order, be equipped with the convergent passageway by heat pipe heat exchanger evaporation zone to first thermoelectric module cold junction on the dry passageway inner wall, dry passageway is equipped with the divergent passageway by first thermoelectric module cold junction to N thermoelectric module cold junction on being located the inner wall of N thermoelectric module below, and dry passageway is equipped with the outlet in N thermoelectric module cold junction below.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113776307A (en) * | 2021-08-26 | 2021-12-10 | 杨庆鸿 | Multi-functional drying device that agricultural production used |
CN114436495A (en) * | 2021-12-30 | 2022-05-06 | 广西科学院应用物理研究所 | Solar air source heat pump sludge drying device |
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