CN107328171A - A kind of air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying - Google Patents
A kind of air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying Download PDFInfo
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- CN107328171A CN107328171A CN201710738927.9A CN201710738927A CN107328171A CN 107328171 A CN107328171 A CN 107328171A CN 201710738927 A CN201710738927 A CN 201710738927A CN 107328171 A CN107328171 A CN 107328171A
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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
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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
- F26B23/004—Heating arrangements using waste heat recovered from dryer exhaust gases by compressing and condensing vapour in exhaust gases, i.e. using an open cycle heat pump system
Abstract
The invention provides a kind of air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying, including drying nest, the heat pump for producing dried medium, the flow channel and flow pass being connected with drying nest；Dried medium flows into the drying nest via flow channel, is discharged after being dried to the dried object in drying nest from flow pass；Drying nest, which includes, is disposed with least two dryer sections at least one drying room, each drying room, delay section is formed between the space that two or more dryer section sequence intervals come between setting, and adjacent dryer section；Dried medium in flow channel flows through dryer section；Dried object is dried by dryer section, is carried out then into delay section after tempering, enters back into next dryer section and be dried.The present invention is by the setting of multiple heat dryings section delay section, and improve drying nest dries production intensity, and the heating energy efficiency ratio of source pump greatly improved.
Description
Technical field
The present invention relates to drying Heat Pump Design technical field, more particularly to a kind of multistage heating multistage tempering heat pump drying
Air-flow open circuit circulation drying system.
Background technology
Heat pump is applied to the middle low temperature drying of such as damp grain containing wet stock, the spy with distinct energy-conserving and environment-protective
Point, has caused the highest attention of heat power engineering field and various circles of society.Considerable heat pump air conditioner enterprise, tries water grain fever
Pump is dried, timber heat pump drying, tobacco leaf, jujube, matrimony vine, grape, black fungus, Chinese herbal medicine etc. agricultural product heat pump drying, ground rice,
Noodles, marine product, pickled and cured meat etc. food article heat pump drying, achieve notable performance.
But, heat pump is used for grain dry, also there is following key technical problem：
First, producing high temperature air will be greatly reduced heat pump heating energy efficiency ratio
Generally, in order to improve dry tenacity and drying efficiency, take and improve doing for drying device (drying room) EAT
Method, that is, improve by improving the temperature of dry air the enthalpy of dry air, reduce the relative humidity of dry air, from
And dry air is improved to heating efficiency and wettability power containing wet stock；
But, if not use coal-fired hot-blast stove etc. fossil thermal source, but heat pump is used as the heat of dry-heat air
Source, then, drying device EAT is improved to improve dry air doing to the heating efficiency containing wet stock and wettability power
Method, exactly " fight the enemy 1,000 from damage 800 ", even " fight the enemy 800 from damage 1,000 ", technically, economically all lose more than gain.
From following U.S. complan (paddy wheel) compressor in different evaporating temperatures and the heating capacity under different condensation temperatures
In test report, it can obtain heating the important conclusion of characteristic on heat pump as follows：Circulation temperature rise (the condensation temperature of heat pump
Degree-evaporating temperature) heating energy efficiency ratio is determined, and it is negatively correlated with heating energy efficiency ratio to circulate temperature rise.
In the following table, H- heating capacities, P- input powers；SC=8 DEG C of system degree of supercooling, SH=11 DEG C of the return-air degree of superheat.
Look at three typical conditions in above-mentioned U.S. complan companies ZWKSE compressor tests report：
1. 10 DEG C of temperature rise (25 DEG C of condensation temperature, 15 DEG C of evaporating temperature) operating mode is circulated
Under 25 DEG C of condensation temperature, 15 DEG C of evaporating temperature operating mode, the circulation warm of heat pump is upgraded to 10 DEG C of (condensation temperatures 25
DEG C -15 DEG C of evaporating temperature), the heating energy efficiency ratio (heating power/power of motor) of source pump is up to 13860W/1427W=
9.7；If plus factors such as blower fan electrical power, heating energy efficiency ratio is also up to 7 or so level；
2. 60 DEG C of temperature rise (65 DEG C of condensation temperature, 5 DEG C of evaporating temperature) operating mode is circulated
Under 65 DEG C of condensation temperature, 5 DEG C of evaporating temperature operating mode, circulation warm is upgraded to 60 DEG C, the heating energy efficiency ratio drop of source pump
It is low to arrive 9774W/3187W=3.1, and this 3187W is the electrical power of compressor, if plus blower fan electrical power and evaporator
It will appear from reversion defrosting system and do not heat etc. factor, whole heating energy efficiency ratio will be reduced to level close to 2；
3. 95 DEG C of temperature rise (65 DEG C of -30 DEG C of evaporating temperatures of condensation temperature) operating mode is circulated
Under condensation temperature -30 DEG C of operating modes of 65 DEG C of evaporating temperatures, circulation temperature rise reaches 95 DEG C, the heat efficiency of source pump
Than there was only 4315W/2853W=1.52, and this 2853W is the electrical power of compressor, if plus blower fan electrical power and steaming
Hair device reversion defrosting system does not heat etc. factor, and whole heating energy efficiency ratio will be reduced to level close to 1, the energy-conservation of heat pump
Characteristic exhausts.
Above-mentioned U.S. complan companies ZWKSE compressor tests report shows：
Heat pump heating energy efficiency ratio, circulation temperature rise (condensation temperature-evaporating temperature) with heat pump is into negative correlativing relation；Follow
Circumstance temperature rises lower, and heating energy efficiency ratio is higher；Circulate that temperature rise is higher, heating energy efficiency ratio is lower, and circulates temperature rise and often expand 10 DEG C,
Heating energy efficiency ratio reduction by 20% or so；When circulation temperature rise reaches more than 60 DEG C, the economy of source pump will be very poor.
2nd, high temperature drying reduces the quality of cereal
Dried using high temperature drying air-flow containing wet stock such as damp grain, be exactly to utilize high temperature drying air-flow heating tide
Wet cereal, promotes moisture heat absorption vaporization effusion in damp grain, and the released sensible heat of high temperature dry air cooling becomes moist
The latent heat of phase change of grain moisture vaporization.
But, this dry air cooling heat release is main to occur to promote " hot and humid area " that damp grain moisture is vaporized
In the surface of damp grain and shallow-layer；After being dried out on the surface of damp grain and shallow-layer, cereal inside contains with surface
The gap expanding of water rate, forms the moist gradient of " wet inside and dry outside ", promotes moisture to be diffused to the surface from inside cereal, until cereal
Inside and outside moisture content is referred to as " tempering " close to or up new balance, the transition process of this cereal internal moisture；This
Individual cereal tempering process, realizes that moisture is diffused to the surface from inside cereal, is arrived and done by next heated-air drying stage
Prepare.
Obviously, the air themperature into drying device is higher, be more conducive to improve dry air to containing wet stock for example
The heating effect of damp grain, the fast endothermic vaporization for promoting cereal surface and shallow-layer moisture, promotion cereal inside and cereal table
The rapid expansion of face moisture content gap, the gradation of moisture of the big step of formation cereal " wet inside and dry outside ", effect is dried containing wet stock
Fruit is also better；
But, for grain dry, the dry air of excessive temperature is quickly deep by the surface and shallow-layer that make damp grain
Spend dehydration, the gradation of moisture rapid expansion of wet inside and dry outside；The dry air of excessive temperature, causes cereal internal and external temperature and moisture content
Serious imbalance, cause cereal occur crackle even fragmentation, reduce cereal bioactivity, reduce cereal mouthfeel and product
Matter.
3rd, drying device air-out dust emission pollution atmospheric environment
In drying process, cereal is self-contained and paddy that is sweeping along hair, paddy clothing and soil dust, is done in drying device
Scorching wind is sloughed after moisture, becomes slim and graceful, lax, and cereal main body is departed from wantonly, air is discharged into the air-out of drying device
Environment, the important sources as atmosphere pollution.
The content of the invention
For the problem of drying system is present in the prior art, the invention provides a kind of multistage heating multistage tempering drying
Air-flow open circuit circulation Analysis of Heat Pump Drying System, including drying nest, heat pump and drying nest for producing dried medium
The dried medium flow channel and flow pass being connected；Dried medium flows into the drying nest via the flow channel,
From flow pass discharge after being dried to the dried object in the drying nest；
The drying nest includes at least one drying room, and at least two dryings are disposed with each drying room
Section, the space that two or more dryer section sequence intervals come between setting, and adjacent dryer section forms delay section；Come
The dryer section is flowed through from the dried medium in the flow channel；
Dried object (i.e. containing wet stock) is dried by the dryer section, is carried out then into the delay section
After tempering, enter back into next dryer section and be dried.
It is preferred that the dryer section includes at least one drying group, each dry is provided with a dry channel, institute in group
Dry channel is stated perpendicular to the flow direction of the dried object；The both sides of the dry channel form two dryer section submodules,
The dried object is located in the dryer section submodule, and stream is translateral after the dried medium enters in the dry channel
Dryer section submodule, after being dried to the dried object in dryer section submodule, flows out dryer section.
It is preferred that the side wall for having dried medium inflow and outflow on the dryer section submodule is constituted by web plate, and it is described
The size of mesh on web plate is less than the size of the dried object.
It is preferred that the end of the dry channel is in closed state.
It is preferred that when the dryer section includes two or more dry groups, being left between adjacent dry group
Dried medium flow pass, flow pass is towards the flow channel side of dried medium in closed state.
It is preferred that the heat pump at least includes two sets of source pumps, often set source pump includes connected
Compressor, condenser, choke valve and evaporator；The condenser is arranged in the dried medium flow channel, and at least one
Individual evaporator is arranged in the dried medium flow pass；
Wherein, the condenser in all source pumps since the import of the dried medium flow channel to the drying
Between order spread configuration, it is logical from the outflow that it often covers corresponding and in the dried medium flow pass evaporator
The outlet in road starts to the drying room order spread configuration.
It is preferred that the heat pump includes three sets of source pumps, the evaporator of three sets of source pumps is respectively positioned on
In the flow pass, and evaporator in the flow pass atmosphere outside with organize corresponding condenser be arranged on it is described
The inlet side of flow channel.
It is preferred that each condenser is far and near sequentially to the position between the drying room, corresponding group of evaporator
To the far and near sequence consensus in position of drying room.
It is preferred that the drying nest includes the drying room that two or more are in parallel, flowed into by described
The dried medium that passage comes is assigned to each drying room and is dried, and is converged again after the completion of drying from flow pass row
Go out.
It is preferred that the dried medium can be heated either directly or indirectly containing wet thing to carry heat and transmitting heat
Material promotes the medium containing moisture evaporation in wet stock, and the dried medium uses air or nitrogen or carbon dioxide or other inertia
Gas.
A kind of air-flow open circuit circulation Analysis of Heat Pump Drying System for multistage heating multistage tempering drying that the present invention is provided is due to adopting
Above technical scheme is used, is allowed to compared with prior art, have the following advantages that and good effect：
1. the setting of multiple heat drying section delay sections, improve drying nest dries production intensity；
2. the setting of multiple heat drying section delay sections, the EAT of dry-heat air needed for reducing drying nest, from
And the heating energy efficiency ratio of source pump greatly improved；
3. multistage heating dryer section delay section and multi-stage heat pump unit combine setting, in " multiple heat drying section temperings
The EAT of dry-heat air needed for the setting of section reduces drying nest is so as to greatly improved the heat efficiency of source pump
Than " basis on, reclaim to dry using heat step and heat source pump module with fresh air step, significantly reduce again
Circulation temperature rise, pressure difference and compression ratio between the condenser and evaporator of each set heat pump itself, are increased substantially again
Each set heat pump heats power and heating energy efficiency ratio；
4. the temperature combined setting, reduce dry air of multiple dryer section delay sections and source pump, it is therefore prevented that " mistake
The dry air of high-temperature causes thermal sensitivity such as grain containing wet stock crackle even fragmentation occur, and reduction thermal sensitivity contains wet stock
Bioactivity and quality " the problem of, improve drying quality of the thermal sensitivity containing wet stock；
5. multistage heating dryer section delay section and multi-stage heat pump unit combine setting, using dry gas stream open circuit circulation,
Heat step reclaims the condensed water moisture film on the heating of dry air step, evaporator group fin, and dryer outlet has been dissolved in absorption
In dust, dust mixed with condensed water after discharge, considerably reduce influence of the drying machine dust-laden air-out to ambient air；
6. the operational mode of " one drags many " of multiple drying machines, big with grain dry industrialization commercialization, crop dryer
The development trend of typeization automation is mutually agreed with, and saves blower fan, electric cabinet, dust removal and filtration equipment etc. in large quantities, in reduction
While investment, the operational efficiency of equipment is also improved.
Brief description of the drawings
With reference to accompanying drawing, by hereafter state detailed description, can be more clearly understood that the present invention above-mentioned and other feature and
Advantage, wherein：
Fig. 1 is the air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying in the embodiment of the present invention one
Structural representation；
Fig. 2 is the transverse sectional view of drying room in the embodiment of the present invention one；
Fig. 3 heats circulation figure for heat pump in the embodiment of the present invention one；
Fig. 4 is the air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying in the embodiment of the present invention two
Structural representation；
Fig. 5 is dried medium step temperature rising and exhaust heat stepped recovery temperature difference schematic diagram in the embodiment of the present invention two；
Fig. 6 is the air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying in the embodiment of the present invention three
Structural representation.
Embodiment
Referring to the accompanying drawing for showing the embodiment of the present invention, the present invention is described in more detail.However, the present invention can be with
Many multi-forms are realized, and should not be construed as being limited by the embodiment herein proposed.On the contrary, proposing that these embodiments are
In order to reach abundant and complete disclosure, and those skilled in the art are made to understand the scope of the present invention completely.These are attached
In figure, for clarity, the size and relative size in layer and region may be exaggerated.
The invention provides a kind of air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying, including do
Dry part, the heat pump for producing dried medium, the dried medium flow channel being connected with drying nest and outflow are logical
Road；Dried medium flows into drying nest via flow channel, after being dried to the dried object (contain wet stock) in drying nest from
Flow pass is discharged；Drying nest, which includes at least one drying room, each drying room, is disposed with least two dryer sections, two
The space that individual or more than two dryer section sequence intervals come between setting, and adjacent dryer section forms delay section；To flow automatically
The dried medium entered in passage flows through dryer section；Dried object is dried by dryer section, then into entering in delay section
After row tempering, enter back into next dryer section and be dried.
Wherein, the setting number of delay section, dryer section in the setting number of drying room, drying room can be according to specific feelings
Condition is adjusted, and is not herein limited.
Drying room is divided into multiple spaced delay sections and dryer section by the present invention, and a dryer section configures one and delayed
Soviet Union's section a, dryer section adds a delay section to constitute a drying " subcycle "；Multiple drying " subcycle " join end to end, and constitute
1 complete drying flow；In a complete drying flow in drying room containing wet stock, dried medium (is usually drying
Air) to carrying out heating for multiple times and multiple tempering containing wet stock.
In dryer section, dried medium cools heat release to promote moist dried object moisture vaporization to realize " hot and humid area ",
Hot and humid area occurs mainly in surface and the shallow-layer of dried object；When dried object flows out delay section after dryer section enters
When, because the surface of dried object and shallow-layer in dryer section have lost part moisture, the inside of dried object and surface
The gap expanding of moisture content, forms the moist gradient of " wet inside and dry outside ", and this moist gradient promotes moisture from inside dried object
Diffuse to the surface, the moisture content inside and outside dried object is close to or up new balance, here it is " tempering "；This is done
Dry thing tempering process, realizes that moisture is diffused to the surface from inside dried object, is to be arrived to do by next heated-air drying stage
Preparation.
The present invention uses " the multiple tempering of heating for multiple times " technology, instead of (such as conventional grain of drying device in the prior art
Drying machine) " once heat a tempering ", by dry air to carrying out heating for multiple times and multiple tempering containing wet stock, pass through
Shorten time span, space length and raising " heat drying+tempering " subcycle of each " heat drying+tempering " subcycle
Dry air temperature (is for example reduced to 50 by the frequency repeated, reduction drying unit to the temperature requirements of dry gas stream from 70 DEG C
DEG C), while improving the speed and intensity dried containing wet stock.Moreover, the setting of the multiple tempering of heating for multiple times reduces drying
The EAT of dry-heat air needed for part, has agreed with " circulation temperature rise (the condensation temperature of heat pump heating energy efficiency ratio and heat pump
Degree-evaporating temperature) into negative correlativing relation, circulation temperature rise often reduces by 10 DEG C, and heating energy efficiency ratio improves more than 20% " operation of heat pump
Logic, so that the heating energy efficiency ratio of source pump greatly improved；
Specific embodiment is further described below：
Embodiment 1
Reference picture 1-3, in the present embodiment, drying nest include a drying room 3, certainly in other embodiments,
Drying nest may also comprise multiple drying rooms, not be limited herein.
In the present embodiment, reference picture 1, drying room is a drying tower structure, and an elevator is provided with the right side of it will be dry
The dried object of dry tower bottom is continuously transported to the top of drying tower so that dried object is transported from drying tower top down
The bottom until drying tower is moved, is so moved in circles until dried object drying.
Wherein, three dryer sections 302 are disposed with drying tower from top to bottom, three dryer sections 302 are spaced apart setting, phase
Drying tower section between adjacent dryer section 302 forms delay section 301；In one cycle in drying tower, dried object warp
After the dryer section for crossing the top, the moisture on dried object surface is come out by dry air heating evaporation in dryer section；Then, quilt
Dried object enters " delay section ", realizes that moisture is diffused to the surface from inside dried object, be next time heat drying stage arrive
To prepare.
The present embodiment substantially increases by three dryer sections, the setting of three delay sections and dries production intensity
Certainly, the structure type of drying room is not limited to above-described dry tower structure in other embodiments, can
It is adjusted correspondingly, is not limited herein according to dried object product.
In the present embodiment, three dried mediums of dryer section 302 are in parallel relationship, and the input of flow channel 1 passes through
One input distribution pipe 8 conveys high temperature drying medium to three dryer sections 302, and the output end of three dryer sections 302 passes through an output
Collecting pipe 9 and pipeline 10 are connected with flow pass 2, and the dried medium discharged by three dryer sections 302 is via output collecting pipe
9th, pipeline 10 is aggregated into flow pass 2.
Certainly, in other embodiments, two dryer sections 302 also can be only provided with, more than three dry is may also set up
Dry section, it can according to specific needs be adjusted, not be limited herein.
Reference picture 2, in the present embodiment, dryer section 302 include at least one drying group, and each dry is provided with one in group
Individual dry channel 3022, stream of the dry channel 3022 perpendicular to the flow direction of dried object, in the present embodiment dried object
Dynamic direction is vertical, and therefore, dry channel 3022 is horizontally disposed with.The both sides of dry channel 3022 form two dryer section submodules
3021, dried object is flowed through in dryer section submodule 3021, and stream is translateral dry after dried medium enters in dry channel 3022
Dry cross-talk module 3021, after being dried to the dried object in dryer section submodule 3021, flows out dryer section 302.
Wherein, the side wall for having dried medium inflow and outflow on dryer section submodule is constituted by web plate, i.e. dry channel two
The side wall of the dryer section submodule of side, and the opposite side wall relative with the side wall are constituted by web plate；Web plate is specifically as follows
It is covered with the mesh that function dried medium flows through on one metal otter board, metal otter board, the size of mesh is less than the size of dried object,
To prevent exposing for dried object.
Wherein, the end of dry channel 3022 is in closed state, to prevent dried medium directly through dry channel 3022
After discharge, to ensure that dried medium, through the dried object in dryer section submodule, improves drying efficiency.
Further, in the present embodiment, as in figure embodiment, dryer section includes two dry groups, for strengthening doing
Dry effect；Moreover, circulation passage 3024 is left between adjacent dry group, so that dried medium flows out；The direction of circulation passage 3024
The flow channel side of dried medium is in closed state, to prevent dried medium from directly passing through drying from the circulation passage 3024
Section.
The present embodiment carries out the structure design of the above to dryer section, and dryer section has been divided into multiple dryer section submodules,
So that dried medium is more fully contacted with dried object, be conducive to improving dry tenacity.Wherein on drying submodule
Setting quantity can be adjusted according to specific needs, or two or more, be not limited herein.
In the present embodiment, heat pump includes one group of source pump, and source pump is by connected compressor 7, condenser
4th, choke valve 6 and evaporator 5 are constituted；From compressor 7 come out it is pressurized after high temperature refrigerant gas, flow through condenser 4
Pipeline, realizes that heat release cools, the refrigerant liquid that high temperature refrigerant gas-condensate liquid is depressured into low pressure through choke valve 6 is input to
In the pipeline of evaporator 5, absorbing heat of vaporization turns into low pressure refrigerant gas；The low pressure system of compressor again to being come by evaporator
After refrigerant gas is pressurizeed, condenser is conveyed to, so as to form a complete refrigerant circulation.
Wherein, condenser 4 is arranged in flow channel 1, and evaporator 5 is arranged in flow pass.Flow channel 1 and outflow
Blower fan 11,12, the circulation for dried medium in whole system are also provided with passage 2.Effect of the dried medium in blower fan
Under, enter in flow channel 1, high temperature drying medium is heated to form by condenser, be then delivered in drying nest to quilt
Dried object is dried, and takes away moisture, then is flowed into flow pass 2 and filters out moisture by cooling by evaporator 5, finally discharges
Reserve passage 2
The drying system that the present invention is provided is an open-circuit system, and dried medium is carrying heat and transmits heat energy
Enough either directly or indirectly heat promotes the medium containing moisture evaporation in wet stock containing wet stock, in the present embodiment dried medium
Directly use air；Certainly, in other embodiments, dried medium can also not limited herein using nitrogen or carbon dioxide etc.
System.
Contain if dried medium heats the promotion containing wet stock being positioned in heat exchanger by dividing wall type heat exchanger indirectly
Moisture evaporation in wet stock, then dried medium can also be using water vapour, conduction oil, water etc..In this condition, evaporator institute
Passage be no longer " flow pass ", but the dried medium such as water vapour, conduction oil, water by being loaded with heat passes through dividing wall type
Heat exchanger heat indirectly be positioned in dividing wall type heat exchanger containing " the water vapour passing away " produced by wet stock.
Fig. 3 is referred again to, heat pump of the drying heat pump provided for the present embodiment on refrigerant LgP-h figures heats circulation
In path, for same evaporating temperature (corresponding to evaporating pressure P1), condensation temperature is reduced, that is, reduce corresponding condensation
Pressure (condensing pressure is reduced to P2 from P2), just reduces the circulation temperature rise of source pump, just reduces the pressure of refrigerant gas
Contracting work((work done during compression is reduced to (h2-h1) by (h5-h1)), here it is reducing the electrical power of compressor；Meanwhile, also expand list
Caloric receptivity of the position quality refrigerant in evaporator (caloric receptivity is expanded to (h1-h3) by (h1-h6))；This allows for source pump
Heating energy efficiency ratio (heating power/power of motor) is largely increased.
Embodiment 2
The present embodiment is in the improvement for implementing to carry out on the basis of 1.
In the present embodiment, heat pump at least includes two sets of source pumps, and often set source pump includes connected
Compressor, condenser, choke valve and evaporator；Condenser is arranged in flow channel, and at least one evaporator is arranged on
In flow pass；Wherein, the condenser in source pump since the import of flow channel to drying room order spread configuration, its
Often cover corresponding and evaporator in the flow pass since the outlet of flow pass to drying room order spread configuration.
The present embodiment transform traditional high-power heat pump waste heat recovery of the big temperature difference of single step as many small temperature of step multi-step
Differential thermal pump type waste heat recovery, makes fluid passage of the dried medium (such as air) for being loaded with the waste heats such as water vapour on the outside of evaporator
Exhaust heat stepped recycling is realized in the middle heat release that continuously slightly cooled；Make dried medium in the fluid passage of outside condenser
By continuously heat temperature raising is that the step for realizing dried medium is heated by a small margin.The present invention is in " the setting of the multiple tempering of heating for multiple times
The EAT of dry-heat air needed for reducing drying nest is so as to greatly improved the heating energy efficiency ratio of source pump " basis
On, the temperature difference, pressure difference and the compression ratio between the condenser and evaporator of each set heat pump itself are significantly reduced again, significantly
Degree improves the Energy Efficiency Ratio of each set heat pump, so as to greatly improved by covering the whole source pump that heat pump is constituted more
Energy Efficiency Ratio, and significantly improve the operating mode of compressor set.
Wherein, the group number of source pump is not limited herein, can be three groups, four groups etc., below with three groups of source pumps
Exemplified by illustrate.
Specifically, reference picture 4, the heat pump includes three groups of source pumps, every group of source pump in the present embodiment
Include condenser (4a, 4b, 4c), evaporator (5a, 5b, 5c), compressor (7a, 7b, 7c) and choke valve (6a, 6b, 6c),
The circulation canal that pipeline in condenser and evaporator is connected and passed through with compressor formation one for cold-producing medium stream, refrigerant compresses certainly
Machine starts to flow through the pipeline in condenser and evaporator successively, and choke valve is set on the pipeline between condenser and evaporator.From
Compressor come out it is pressurized after high temperature refrigerant gas, flow through the pipeline of condenser, realize that heat release cools, high temperature refrigerant
The refrigerant liquid that gas-condensate liquid is depressured into low pressure through choke valve is input in the pipeline of evaporator, absorb heat of vaporization into
For low pressure refrigerant gas；After compressor pressurizes to the low pressure refrigerant gas come by evaporator again, condensation is conveyed to
Device, so as to form a complete refrigerant circulation.
In the present embodiment, condenser 4a, 4b, 4c of three groups of source pumps are arranged in flow channel 1, evaporator
5a, 5b, 5c are arranged in flow pass 2.Wherein, condenser 4a, 4b, 4c in three groups of source pumps are from flow channel 1
Inlet side starts the side order spread configuration (i.e. 4a → 4b → 4c) to drying room 3, while every group of corresponding evaporator
5a, 5b, 5c since flow pass 2 outlet side to drying room 3 side order spread configuration (i.e. 5a → 5b → 5c).It is cold
It is spaced a distance between condenser 4a, 4b, 4c, it is also spaced a distance between evaporator 5a, 5b, 5c；Preferably, each institute
Condenser is stated to the far and near order in position between drying room, the far and near order one in position of corresponding group of evaporator to drying room
Cause.
Dried object is placed in drying room 3, and dried medium (being illustrated by taking air as an example) is in the presence of blower fan 11
Entered from the import of flow channel in flow channel 1.Dried medium air is entered after flow channel 1, sequentially passes through condensation
Device 4a, 4b, 4c, absorptive condenser inner refrigerant gas condensation liberated heat, dried medium air are heated into high temperature by step
Air；High temperature air is input into drying room 3, and the dried object in drying room 3 is dried；Dried object is done
The output containing wet high temperature air after dry is entered in flow pass 2；After entering containing wet high temperature air in flow pass 2, flow successively
Through evaporator 5c, 5b, 5a, heat exchange is carried out with the refrigerant liquid in evaporator, heat, evaporator are released containing wet high temperature air
5c, 5b, 5a realize exhaust heat stepped recovery；When passing through evaporator 5c, 5b, 5a containing wet high temperature air, condensation moisture.
The source pump being made up of 3 grades of heat pumps, the dry-heat air temperature of condenser group production is at 50 DEG C or so；Source pump
The refrigerant gas condensation temperature of 3 condensers is respectively near 40/50/60 DEG C, and 3 evaporating temperatures are respectively at 10/15/20 DEG C
Near, the circulation temperature rise of this 3 grades of heat pumps is respectively near 30/35/40 DEG C, and heat pump heating energy efficiency ratio is higher, can reach 6 times
More than；
Fig. 5 is referred again to, is air step temperature rising and exhaust heat stepped recovery temperature difference schematic diagram in the present embodiment：
By evaporator 5a by the part in temperature step extreme higher position (>=t3) in the flow pass 1 on the outside of it
Atmospheric heat, condenser 4a is conveyed to compressor 7a, for being in temperature step in the flow channel 2 on the outside of condenser 4a
The heating of extreme higher position T2 part air, is allowed to temperature and rises to T3；
Make that portion in the high position (t3 → t2) of temperature step time in the flow pass 1 on the outside of it by evaporator 5b
Divide atmospheric heat, condenser 4b is conveyed to compressor 7b, for being in temperature platform in the flow channel 2 on the outside of condenser 4b
The heating of the high position T1 of order part air, is allowed to temperature and rises to T2；
Make that portion in temperature step extreme lower position (t2 → t1) in the flow pass 1 on the outside of it by evaporator 5c
Divide atmospheric heat, compressor 4c is conveyed to compressor 7c, for being in temperature platform in the flow channel 2 on the outside of compressor 4c
The heating of the part air of rank extreme lower position (≤T1), is allowed to temperature and rises to T1：
The above-mentioned this exhaust heat stepped condenser-reboiler operational difference for reclaiming dried medium step temperature rising source pump
Main body is T3-t3, T2-t2, T1-t1, hence it is evident that less than the respective value of the high-power heat pump waste heat recovery of the big temperature difference of single step；Because one
Condensation temperature ＞ T3, the evaporating temperature ＜ t1 of the high-power heat pump of the big temperature difference of step formula, the main body of condenser-reboiler operational difference=
T3-t1。
The air-flow open circuit circulation Analysis of Heat Pump Drying System for the multistage heating multistage tempering drying that the present invention is provided, takes many steps
Multi-step small temperature difference thermal pump type waste heat recovery, makes flow pass of the fluid media (medium) for being loaded with the waste heats such as water vapour on the outside of evaporator
Exhaust heat stepped recycling is realized by continuous slightly cool-down dehumidification heat release in 2；Make dried medium (such as air) outside condenser
By continuously heat temperature raising realizes that the step of dried medium is heated by a small margin in the fluid passage of side；Because the present invention " is repeatedly adding
The EAT of dry-heat air is so as to greatly improved source pump needed for the setting of hot repeatedly tempering reduces drying nest
It is high-power with single step again using " exhaust heat stepped recovery dried medium step temperature rising " technology on the basis of heating energy efficiency ratio "
Single-stage heat pump drying unit is compared, and the temperature between the condenser and evaporator of each set heat pump itself is significantly reduced again
Difference, pressure difference and compression ratio, are greatly improved the Energy Efficiency Ratio of each set heat pump, so as to greatly improved by covering heat pump more
The Energy Efficiency Ratio of the whole source pump of composition, and significantly improve the operating mode of compressor set.
In the present embodiment, the specific constructive form of drying room 3 is with reference to the description in embodiment 1；In addition, in the present embodiment
The setting quantity of drying room 3 is not limited to shown in Fig. 3, may also set up two or more, is not limited herein.
To sum up, the air-flow open circuit circulation Analysis of Heat Pump Drying System for the multistage heating multistage tempering drying that the present embodiment is provided, is deposited
In following beneficial effect：
1. the setting of multiple heat drying section delay sections, improve drying nest dries production intensity；
2. the setting of multiple heat drying section delay sections, the air intake of dry-heat air needed for reducing drying nest (drying tower)
Temperature, agreed with " the circulation temperature rise (condensation temperature-evaporating temperature) of heat pump heating energy efficiency ratio and heat pump into negative correlation close
System, circulation temperature rise often reduces by 10 DEG C, and heating energy efficiency ratio improves more than 20% " operation of heat pump logic, so that heat greatly improved
The heating energy efficiency ratio of pump assembly；
3. multistage heating dryer section delay section and multi-stage heat pump unit combine setting, in " multiple heat drying section temperings
The EAT of dry-heat air needed for the setting of section reduces drying nest (drying tower) is so as to greatly improved source pump
On the basis of heating energy efficiency ratio ", multi-stage heat pump set modules of the invention, then the air-out of multistage drying nest (is loaded with big
Measure the warm-humid air with drying nest air intake " constant enthalpy " of water vapour) heat step recycling is carried out, drying is entered with fresh air
The small temperature difference condenser heating of row step multi-step, significantly reduces the condenser and evaporator of each set heat pump itself again
Between circulation temperature rise, pressure difference and compression ratio, be greatly improved again it is each set heat pump Energy Efficiency Ratio so that again
It greatly improved by covering the Energy Efficiency Ratio for the whole source pump that heat pump is constituted more, and considerably reduce the row of compressor
Temperature degree, significantly improves the operating mode of compressor set；
4. the temperature combined setting, reduce dry air of multiple dryer section delay sections and source pump, it is therefore prevented that " mistake
The dry air of high-temperature causes thermal sensitivity such as grain containing wet stock crackle even fragmentation occur, and reduction thermal sensitivity contains wet stock
Bioactivity and quality " the problem of, improve drying quality of the thermal sensitivity containing wet stock；
5. multistage heating dryer section delay section and multi-stage heat pump unit combine setting, using dry gas stream open circuit circulation,
Heat step reclaims the condensed water moisture film on the heating of dry air step, evaporator group fin, and dryer outlet has been dissolved in absorption
In dust, dust mixed with condensed water after discharge, considerably reduce influence of the drying machine dust-laden air-out to ambient air.
Embodiment 3
The present embodiment realizes the improvement carried out on the basis of embodiment 1 or embodiment 2.
In the present embodiment, drying nest includes the drying room that two or more are in parallel, by the mistake of flow channel 1
The dried medium come is assigned to each drying room and is dried, and converges and is discharged from flow pass 2 again after the completion of drying.
The drying system that the present embodiment is provided using large-scale source pump drag simultaneously multiple drying machines " one drags
It is many " operational mode, with grain dry industrialization commercialization, crop dryer maximization automation development trend mutually agree with,
And blower fan, electric cabinet, dust removal and filtration equipment etc. are saved in large quantities, while investment is reduced, also improve the fortune of equipment
Line efficiency.
Specifically, reference picture 6, in the present embodiment, drying nest include 5 drying rooms in parallel (3a, 3b, 3c,
3d, 3e), the dried medium come is conveyed by flow channel 1 and is transported to by a total score pipe arrangement 13 in each drying room, each is done
The dried medium exported in dry is also sent back in flow pass by a total gathering tube 14.
Certainly, in other embodiments, drying nest can also only include two drying rooms, may also comprise 3 etc., this
Place is not limited.
Those skilled in the art should be understood that the present invention can be implemented without departing from this with many other concrete forms
The spirit or scope of invention.Although having been described for embodiments of the invention, it should be understood that the present invention should not be limited to these embodiments,
Change is made within the spirit and scope of the invention that those skilled in the art can define such as appended claims and is repaiied
Change.
Claims (10)
1. a kind of air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying, it is characterised in that including drying
Partly, the dried medium flow channel and dried medium for producing the heat pump of dried medium, being connected with drying nest
Flow pass；Dried medium flows into the drying nest via the flow channel, to the dried object in the drying nest
Discharged after drying from the flow pass；
The drying nest includes at least one drying room, and at least two dryer sections, two are disposed with each drying room
The space that individual or more than two dryer section sequence intervals come between setting, and adjacent dryer section forms delay section；From institute
State the dried medium in flow channel and flow through the dryer section；
Dried object is dried by the dryer section, carries out after tempering, enters back into then into the delay section
Next dryer section is dried.
2. the air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying according to claim 1, it is special
Levy and be, the dryer section includes at least one drying group, and each dry is provided with a dried medium passage in group, described dry
Dry medium channel is perpendicular to the flow direction of the dried object；The both sides of the dried medium passage form two dryer section submodules
Block, the dried object is located in the dryer section submodule, and the dried medium flows through two after entering in the dry channel
The dryer section submodule of side, after being dried to the dried object in dryer section submodule, flows out dryer section.
3. the air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying according to claim 2, it is special
Levy and be, the side wall of dried medium inflow and outflow is constituted by web plate on the dryer section submodule, and the net on the web plate
The size in hole is less than the size of the dried object.
4. the air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying according to claim 2, it is special
Levy and be, the end of the dried medium passage is in closed state.
5. the air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying according to claim 2, it is special
Levy and be, when the dryer section includes two or more dry groups, dried medium is left between adjacent dry group
Flow pass, flow pass is towards the flow channel side of dried medium in closed state.
6. the air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying according to claim 1, it is special
Levy and be, the heat pump at least includes two sets of source pumps, often cover source pump include connected compressor, it is cold
Condenser, choke valve and evaporator；The condenser is arranged in the dried medium flow channel, and at least one evaporator is set
Put in the dried medium flow pass；
Wherein, the condenser in all source pumps is suitable to the drying room since the import of the dried medium flow channel
Sequence spread configuration, it often covers evaporator that is corresponding and being located in the dried medium flow pass from the dried medium stream
The outlet for going out passage starts to the drying room order spread configuration.
7. according to the air-flow open circuit circulation Analysis of Heat Pump Drying System of the multistage heating multistage tempering drying described in claim 1, its feature
It is, the heat pump includes three sets of source pumps, the evaporator of three sets of source pumps is respectively positioned on dry Jie
In matter flow pass, and evaporator corresponding condenser setting with group in dried medium flow pass atmosphere outside
In the inlet side of the flow channel.
8. according to the air-flow open circuit circulation Analysis of Heat Pump Drying System of the multistage heating multistage tempering drying described in claim 6 or 7, it is special
Levy and be, each condenser to the far and near order in the position between the drying room, corresponding group of evaporator to drying room
The far and near sequence consensus in position.
9. according to the air-flow open circuit circulation Analysis of Heat Pump Drying System of the multistage heating multistage tempering drying described in claim 1, its feature
It is, the drying nest includes the drying room that two or more are in parallel, and is come by the flow channel
Dried medium is assigned to each drying room and is dried, and is converged again after the completion of drying from flow pass discharge.
10. according to the air-flow open circuit circulation Analysis of Heat Pump Drying System of the multistage heating multistage tempering drying described in claim 1, its feature
It is, the dried medium contains moisture evaporation in wet stock to carry heat and transmitting heat and can heat dried object and promote
Medium, the dried medium use air or nitrogen or carbon dioxide or other inert gases.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183573A (en) * | 2017-12-29 | 2018-06-19 | 南京钢铁股份有限公司 | Large-size machine anti-gray dampproof method |
| CN108626740A (en) * | 2018-04-08 | 2018-10-09 | 大唐(北京)能源管理有限公司 | A kind of smoke multistage drying brown coal electricity generation system |
| CN108826942A (en) * | 2018-07-27 | 2018-11-16 | 苏州协宏泰节能科技有限公司 | A kind of powder flow heat pump dryer |
| CN110319684A (en) * | 2019-07-29 | 2019-10-11 | 瀚能(苏州)节能科技有限公司 | Powder flow dries cooling integrated machine |
| CN112902642A (en) * | 2021-03-31 | 2021-06-04 | 安徽辰宇机械科技有限公司 | Mixed flow type grain drying machine |
| CN116045626A (en) * | 2022-12-27 | 2023-05-02 | 安徽欧瑞达电器科技有限公司 | Directly-heated air source heat pump dryer |
| CN108626740B (en) * | 2018-04-08 | 2024-04-26 | 大唐(北京)能源管理有限公司 | Multistage dry brown coal power generation system of flue gas |
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| CN207600072U (en) * | 2017-08-24 | 2018-07-10 | 上海伯涵热能科技有限公司 | A kind of air-flow open circuit circulation Analysis of Heat Pump Drying System of multistage heating multistage tempering drying |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183573A (en) * | 2017-12-29 | 2018-06-19 | 南京钢铁股份有限公司 | Large-size machine anti-gray dampproof method |
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| CN108626740B (en) * | 2018-04-08 | 2024-04-26 | 大唐(北京)能源管理有限公司 | Multistage dry brown coal power generation system of flue gas |
| CN108826942A (en) * | 2018-07-27 | 2018-11-16 | 苏州协宏泰节能科技有限公司 | A kind of powder flow heat pump dryer |
| CN110319684A (en) * | 2019-07-29 | 2019-10-11 | 瀚能(苏州)节能科技有限公司 | Powder flow dries cooling integrated machine |
| CN112902642A (en) * | 2021-03-31 | 2021-06-04 | 安徽辰宇机械科技有限公司 | Mixed flow type grain drying machine |
| CN116045626A (en) * | 2022-12-27 | 2023-05-02 | 安徽欧瑞达电器科技有限公司 | Directly-heated air source heat pump dryer |
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