CN104567090B - A kind of trans critical cycle provides two-stage absorption cycle that the composite refrigeration system of heat occurs - Google Patents
A kind of trans critical cycle provides two-stage absorption cycle that the composite refrigeration system of heat occurs Download PDFInfo
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 35
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 34
- 239000002131 composite material Substances 0.000 title claims abstract description 24
- 230000006835 compression Effects 0.000 claims abstract description 31
- 238000007906 compression Methods 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 47
- 239000006096 absorbing agent Substances 0.000 claims description 32
- 230000008676 import Effects 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- IPLONMMJNGTUAI-UHFFFAOYSA-M lithium;bromide;hydrate Chemical compound [Li+].O.[Br-] IPLONMMJNGTUAI-UHFFFAOYSA-M 0.000 claims description 8
- 230000002745 absorbent Effects 0.000 claims description 7
- 239000002250 absorbent Substances 0.000 claims description 7
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 6
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 5
- 239000002608 ionic liquid Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- WFKAJVHLWXSISD-UHFFFAOYSA-N isobutyramide Chemical compound CC(C)C(N)=O WFKAJVHLWXSISD-UHFFFAOYSA-N 0.000 claims description 2
- 239000001272 nitrous oxide Substances 0.000 claims description 2
- 150000004040 pyrrolidinones Chemical class 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical group [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 claims 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 claims 1
- 239000002918 waste heat Substances 0.000 abstract description 12
- 239000000243 solution Substances 0.000 description 42
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 19
- 238000009833 condensation Methods 0.000 description 17
- 230000005494 condensation Effects 0.000 description 17
- 238000001704 evaporation Methods 0.000 description 15
- 239000007789 gas Substances 0.000 description 14
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 14
- 239000003507 refrigerant Substances 0.000 description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 description 11
- 230000008020 evaporation Effects 0.000 description 11
- 239000001569 carbon dioxide Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 imidazol ion Chemical class 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-O pyridinium Chemical class C1=CC=[NH+]C=C1 JUJWROOIHBZHMG-UHFFFAOYSA-O 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/02—Compression-sorption machines, plants, or systems
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses a kind of trans critical cycle provides two-stage to absorb hot composite refrigeration system by Trans-critical cycle compression subsystem, high pressure absorbs subsystem and low pressure absorbs subsystem composition, it is that the compression of a kind of novel enclosed absorbs hybrid system, coupled by rational energy, make high pressure absorb subsystem and low pressure absorbs the generation heat of subsystem all from Trans-critical cycle compression subsystem, make two-stage absorb low-pressure stage simultaneously and may utilize waste heat taste reduction, improve the utilization rate of Trans-critical cycle compressor outlet exhaust heat amount, make absorption subsystem without extra heat input, only need the necessary electric energy inputs such as compressor, there is good independence and the scope of application；Compared with the compression circulation of simple Trans-critical cycle, hybrid system circulation COP can improve about 30%～40%, has good economy.
Description
Technical field
The invention belongs to refrigerating field, relate to a kind of compression/two-stage and absorb composite refrigeration system, specifically relate to
And a kind of trans critical cycle provides two-stage absorption cycle that the composite refrigeration system of heat occurs.
Background technology
Along with the theory of energy-conserving and environment-protective is rooted in the hearts of the people, Trans-critical cycle kind of refrigeration cycle can utilize greenhouse to imitate because of it
Answer latent energy value higher but freon class working medium such as R23, R508B or natural refrigerant such as CO of environmental protection2、
N2The advantage of O has obtained paying close attention to widely.Trans-critical cycle kind of refrigeration cycle has delivery temperature height, temperature sliding
Move big feature, there is high temperature and substantial amounts of condensation heat is available for recycling, as far back as calendar year 2001, corona
First CO that company and Dens company develop jointly2Teat pump boiler just can be at higher energy efficiency ratio
The hot water of lower offer 65 DEG C；Additionally, due to CO2Refrigerating effect per unit swept volume big, trans critical cycle
There is higher refrigerating efficiency (COP is up to more than 3.0).Comprehensive above feature, effectively utilizes height
Temperature exhaust heat reduce the energy consumption for cooling of system itself, further the raising coefficient of performance can expand across
The advantage of critical cycle, the most energy-conservation, it is one of the application mode of great potential.
As far back as the fifties in last century, absorption system is the most corresponding with compression system compound-refrigerating
Research, this system can utilize the waste heat of condensation of compressibility, and improve refrigerating efficiency, and across facing
Boundary's circulation has higher waste heat amount and taste as the one of compression circulation, is very suitable for this kind of multiple
Assembly system.But, existing absorption/multiplex open circulation of compression combined kind of refrigeration cycle, absorb and press
Contraction hail recycles identical working media, owing to the requirement of working medium is had by both refrigeration modes
Many differences, inevitably sacrifice the performance of a wherein side, even by identical working medium
The performance of two kinds of refrigeration modes all can be affected, thus causes the performance of combined-circulation to reduce.
On existing compound-refrigerating development foundation, the Chinese patent of Application No. 201210147756.X
Document discloses the Trans-critical cycle/absorption combined refrigerator utilizing low-grade heat, this be an enclosed across
Critical compressive absorbs hybrid system, is respectively adopted different working medium, and two systems only carry out the exchange of energy,
The high temperature condensation heat of trans critical cycle can be utilized fully, and Trans-critical cycle refrigerating efficiency is greatly improved.So
And, because of system cycle characteristics, hiigh pressure stage generator only may utilize the waste heat of condensation of more than 65 DEG C, and manages
May utilize on Lun to less than 40 DEG C, UTILIZATION OF VESIDUAL HEAT IN is the most insufficient.Although additionally, low-pressure stage generator can
To utilize the extremely low-grade thermal source of 50 DEG C～60 DEG C be typically wasted, but remain a need for substantial amounts of outside
Energy inputs, and is not suitable for providing the common building environment of a large amount of waste heat.
Summary of the invention
The invention provides a kind of trans critical cycle provides two-stage absorption cycle that the compound-refrigerating of heat occurs
System, it is reasonable to be absorbed between subsystem, low pressure absorption subsystem by Trans-critical cycle compression subsystem and high pressure
Energy coupling, make high-low pressure occur institute calorific requirement all to be from more than the condensation of Trans-critical cycle compression subsystem
Heat, is made full use of.
The technical scheme is that
A kind of trans critical cycle provides two-stage absorption cycle the composite refrigeration system of heat to occur, by Trans-critical cycle
Compression subsystem, high pressure absorb subsystem and low pressure absorbs subsystem and forms, wherein,
Described high pressure absorbs the steam (vapor) outlet of the high pressure generator of subsystem and the entrance phase of condenser
Even, the outlet of condenser is connected with the import of first throttle device, and the outlet of first throttle device is with cold
The liquid inlet of solidifying evaporimeter is connected, the liquid outlet of high pressure absorber and the import phase of the first circulating pump
Even, the first passage entrance of the first circulation delivery side of pump and the first solution heat exchanger is connected, the first solution
The first passage outlet of heat exchanger is connected with the liquid inlet of high pressure generator, the liquid of high pressure generator
Outlet is connected with the second channel entrance of the first solution heat exchanger, the second channel of the first solution heat exchanger
Outlet is connected with the entrance of the second throttling arrangement, the outlet of the second throttling arrangement and the liquid of high pressure absorber
Body entrance is connected；
The outlet of the low pressure generator that described low pressure absorbs subsystem is divided into two-way, and a road is inhaled with high pressure
Receiving the gas access connection of device, another road is connected with the gas access of condenser/evaporator, condenser/evaporator
Liquid outlet and the 3rd throttling arrangement import be connected, the outlet of the 3rd throttling arrangement with first evaporation
The entrance of device is connected, and the outlet of the first evaporimeter is connected with the gas access of low-pressure absorber, and low pressure is inhaled
The import of the liquid outlet and the second circulating pump of receiving device is connected, the second circulation delivery side of pump and the second solution
The first passage entrance of heat exchanger is connected, and the first passage outlet of the second solution heat exchanger occurs with low pressure
The liquid inlet of device is connected, the liquid outlet of low pressure generator and the second channel of the second solution heat exchanger
Entrance is connected, and the second channel outlet of the second solution heat exchanger is connected with the entrance of the 4th throttling arrangement,
The outlet of the 4th throttling arrangement is connected with the liquid inlet of low-pressure absorber；
It is provided with the first coil heat exchanger in high pressure generator, in described low pressure generator, is provided with the second coil pipe
Heat exchanger；
The outlet of the compressor of described Trans-critical cycle compression subsystem and the entrance of the first coil heat exchanger
Being connected, the outlet of the first coil heat exchanger is connected with the entrance of the second coil heat exchanger, and the second coil pipe changes
The outlet of hot device is connected with the import of air cooler, the outlet of air cooler and the first passage import of regenerator
Being connected, the first passage outlet of regenerator is connected with the import of the 5th throttling arrangement, the 5th throttling arrangement
Outlet be connected with the import of the second evaporimeter, the outlet of the second evaporimeter and the second channel of regenerator
Import is connected, and the second channel outlet of regenerator is connected with the air entry of compressor.
The working fluid of described Trans-critical cycle compression subsystem sequentially passes through compressor, the first coil heat exchange
Device, the second coil heat exchanger, air cooler, regenerator first passage, the 5th throttling arrangement, the second steaming
Return to compressor after sending out device, regenerator second channel, complete compression refrigeration subcycle.
As preferably, the inside of described air cooler and condenser is equipped with cooling coil, described cooler pan
The import and export of pipe connects with cooling medium source.In described cooling coil fill cooling medium be water,
Air or other media.Described high pressure absorber (12), the second evaporimeter (7), the first evaporation
The coil pipe of device (18) and low-pressure absorber (19) inside is also provided with cooling coil.
Described trans critical cycle provides two-stage to absorb the composite refrigeration system of heat, and its workflow is such as
Under:
For Trans-critical cycle compression subsystem, the superheated refrigerant steam after compressor work,
Internal the first coil heat exchanger exothermic condensation cooling arranged of high pressure generator, occurs subsequently into low pressure
Internal the second coil heat exchanger heat release arranged of device condenses cooling further, further through air cooler
Cooling, then passes through regenerator first passage and the refrigerant vapour heat-shift in second channel, so
Enter heat absorption evaporation in the second evaporimeter by the 5th throttling arrangement, produce Part I cold.
Refrigerant vapour after evaporation, after regenerator second channel heat-shift, returns to compressor, opens
Begin new circulation.
The first described coil heat exchanger and the second coil heat exchanger are the most respectively at high pressure generator and low
In pressure generator, heated solution produces refrigerant vapour, and the condensation as Trans-critical cycle compression subsystem fills again
Put cooling down high-temperature exhaust.
Trans-critical cycle compression subsystem absorbs subsystem for high pressure simultaneously and low pressure absorbs subsystem and provides suction
Receive heat, it is no longer necessary to substantial amounts of external energy inputs.
Subsystem is absorbed for high pressure and low pressure absorbs subsystem, in the condensation of Trans-critical cycle compression subsystem
Under the driving of waste heat, the working fluid in high pressure generator produces the refrigerant vapour of HTHP, should
Steam enters condensation cooling condenser from the gas vent of high pressure generator.
Concentrated solution in high pressure generator enters the second channel heat exchange fall of the first solution heat exchanger simultaneously
Entering high pressure absorber through the second throttling arrangement after temperature, described concentrated solution is molten as the absorption of absorber
Liquid.Described concentrated solution becomes weak solution after the first circulating pump boosting through the first solution heat exchange after absorbing
Device first passage preheats and returns to high pressure generator.
The refrigerant vapour of HTHP enters through first throttle device after condensing cooling within the condenser
Condenser/evaporator.The cold-producing medium that low pressure generator produces under the driving of Trans-critical cycle compression condensation waste heat steams
Vapour, the working fluid generation heat exchange being partly into condenser/evaporator with carrying out condenser, another
Absorbed after partly then leading to the gas access of high pressure absorber.
After the proportion of composing of air-liquid two-phase in condenser/evaporator regulation container, exist with liquid phase
The liquid outlet of the condensed evaporimeter of cold-producing medium after the 3rd throttling arrangement reducing pressure by regulating flow, enter first
Evaporimeter is evaporated, and produces Part II cold.
In first evaporimeter, the refrigerant vapour after evaporation enters low through the gas access of low-pressure absorber
Pressure absorber, is absorbed by absorbent solution therein.Dilute after absorption refrigeration agent steam in low-pressure absorber
Solution enters the first passage of the second solution heat exchanger after the second circulating pump boosting and preheats, then
Enter low pressure generator.The concentrated solution that low pressure generator produces after occurring is through the second solution heat exchanger
Second channel, then return to low-pressure absorber after the 4th throttling arrangement reducing pressure by regulating flow.
As preferably, described high pressure absorbs subsystem and low pressure absorbs working fluid used by subsystem for system
Cryogen and the combination of absorbent.Described refrigerant component has low boiling, and described absorber component has
Higher boiling.
As preferably, described high pressure absorbs subsystem and low pressure absorb working fluid used by subsystem be from
The working medium pair that sub-liquid or salt form with water.The cation of ionic liquid includes: alkyl quaternary ammonium ion,
Alkyl quaternary is seen ion, the substituted imidazol ion of 1,3-dialkyl group and the substituted pyridinium ion of N-alkyl
This four class；Its anion includes halide salt and BF4.Ionic liquid is permissible compared to lithium bromide water solution
Corrosivity to metal parts, and the ionic liquid that can according to operating condition design want are greatly lowered
The composition of body, has more preferable adaptability for working condition.
Further preferred as working fluid, described high pressure absorbs subsystem and low pressure absorbs subsystem
Working fluid used is lithium bromide-water solution or ammoniacal liquor.
Preferred as cold-producing medium, described cold-producing medium is freon class cold-producing medium.
Preferred as absorbent, described absorbent is dimethylformamide, dimethylacetylamide or three
Glycol dimethyl ether or pyrrolidones.Carbon dioxide is as a kind of safe and reliable natural medium, more closely
Year has caused extensive concern, and the application in trans critical cycle also quickly grows；Nitrous oxide conduct
Another kind of natural medium, its physical property is similar to carbon dioxide, the molecular weight of the two, critical-temperature,
Critical pressure is close；The triple point of nitrous oxide-90.82 DEG C, far below carbon dioxide
-55.58 DEG C, can apply to low temperature field.
As preferably, the working fluid of described Trans-critical cycle compression subsystem is carbon dioxide or an oxidation
Phenodiazine.
As preferably, the working fluid of described Trans-critical cycle compression subsystem is R23, R41, R32,
R290 or R508B.Described working fluid can also be the mixture of the mixture of R23, R41
Or R32 Yu R290 mixture.
R23, R41, R32, R290 and R508B belong to that chamber effect potential value is higher but environmental protection
Freon class working medium is little to environmental hazard.
The beneficial effects of the present invention is:
A kind of trans critical cycle of the present invention provides two-stage absorption cycle that the composite refrigeration system of heat occurs,
It is that the compression of a kind of novel enclosed absorbs hybrid system, is coupled by rational energy, make height arbitrarily downgrade
Occur heat all from Trans-critical cycle compressibility, improve the utilization of compressibility waste heat of condensation
Rate, and without extra energy input, there is good independence and the scope of application.Cold by system
The regulation of solidifying evaporimeter, low-pressure stage may utilize waste heat taste can as little as about 50 DEG C, improves Trans-critical cycle
The available waste heat amount of compressor outlet exhaust；Compared with the compression circulation of simple Trans-critical cycle, system circulates
COP can improve about 30～40%, has good economy.
Accompanying drawing explanation
The trans critical cycle that Fig. 1 is embodiment 1 provides two-stage to absorb the signal of hot composite refrigeration system
Figure, in figure: 1 be compressor, 2 be the first coil heat exchanger, 3 be the second coil heat exchanger, 4 be
Air cooler, 5 for regenerator, 6 be the 5th throttling arrangement, 7 be the second evaporimeter, 8 for high pressure generation
Device, 9 for condenser, 10 be the second throttling arrangement, 11 for condenser/evaporator, 12 for high pressure absorption
Device, 13 be the first circulating pump, 14 be the first solution heat exchanger, 15 be the second throttling arrangement, 16 be
Low pressure generator, 17 be the 3rd throttling arrangement, 18 be the first evaporimeter, 19 for low-pressure absorber,
20 it is the second circulating pump, 21 is the second solution heat exchanger, 22 is the 4th throttling arrangement；A, b and c
Being respectively the liquid inlet of high pressure generator, gas vent and liquid outlet, d and e is respectively first
The outlet of coil heat exchanger and entrance, f, g and h are respectively the liquid inlet of high pressure absorber, gas
Entrance and liquid outlet, i, j and k are respectively the gas vent of low pressure generator, liquid inlet and liquid
Body exports, l and m is respectively the entrance and exit of the second coil heat exchanger, and n, o and p are the lowest
The pressure liquid inlet of absorber, gas access and liquid outlet, q, r and s are respectively condenser/evaporator
Liquid inlet, liquid outlet and gas access.
The trans critical cycle that Fig. 2 is embodiment 1 provides two-stage to absorb the COP of hot composite refrigeration system
With condenser/evaporator temperature variation, Tg1 is senior occurrence temperature, and Tg2 is low-pressure stage occurrence temperature,
T_m is condenser/evaporator temperature, and COPmt is the hybrid system coefficient of performance；
Fig. 3 is the schematic diagram of the refrigeration system of comparative example 1；
Fig. 4 provides two-stage to absorb hot composite refrigeration system and comparative example for embodiment 1 trans critical cycle
1 trans critical cycle provides the COP of single-stage lithium bromide-water absorption type composite refrigeration system with occurrence temperature
Variation diagram, Tg is occurrence temperature, and COPhp is that simple Trans-critical cycle compresses cycle performance coefficient, COPmt
For the hybrid system coefficient of performance.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
As it is shown in figure 1, a kind of trans critical cycle provide two-stage absorb heat composite refrigeration system, by across
Critical compressive subsystem, high pressure absorb subsystem and low pressure absorbs subsystem composition；
Its mesohigh absorbs the steam (vapor) outlet b of the high pressure generator 8 of subsystem and the entrance of condenser 9
Being connected, the outlet of condenser 9 is connected with the import of first throttle device 10, first throttle device 10
Outlet be connected with the liquid inlet q of condenser/evaporator 11, the liquid outlet h of high pressure absorber 12
Import with the first circulating pump 13 is connected, the outlet of the first circulating pump 13 and the first solution heat exchanger 14
First passage entrance be connected, the outlet of the first passage of the first solution heat exchanger 14 and high pressure generator 8
Liquid inlet a be connected, the liquid outlet c of high pressure generator 8 and the first solution heat exchanger 14
Second channel entrance is connected, second channel outlet and second throttling arrangement of the first solution heat exchanger 14
The entrance of 15 is connected, the outlet of the second throttling arrangement 15 and the liquid inlet f of high pressure absorber 12
It is connected；
The outlet i of the low pressure generator 16 that low pressure absorbs subsystem is divided into two-way, and a road absorbs with high pressure
The gas access g connection of device 12, another road is connected with the gas access s of condenser/evaporator 11, cold
The liquid outlet r of solidifying evaporimeter 11 and the import of the 3rd throttling arrangement 17 are connected, the 3rd throttling arrangement
The outlet of 17 is connected with the entrance of the first evaporimeter 18, and the outlet of the first evaporimeter 18 absorbs with low pressure
The gas access o of device 19 is connected, the liquid outlet p of low-pressure absorber 19 and the second circulating pump 20
Import be connected, outlet and the first passage entrance of the second solution heat exchanger 21 of the second circulating pump 20
It is connected, the first passage outlet of the second solution heat exchanger 21 and the liquid inlet j of low pressure generator 16
It is connected, the liquid outlet k of low pressure generator 16 and the second channel entrance of the second solution heat exchanger 21
Being connected, the second channel outlet of the second solution heat exchanger 21 is connected with the entrance of the 4th throttling arrangement 22,
The outlet of the 4th throttling arrangement 22 is connected with the liquid inlet n of low-pressure absorber 19；
It is provided with the first coil heat exchanger 2 in high pressure generator 8, in low pressure generator 16, is provided with the second dish
Heat exchange of heat pipe 3；
The outlet of the compressor 1 of Trans-critical cycle compression subsystem and the entrance d phase of the first coil heat exchanger 2
Even, the outlet e of the first coil heat exchanger 2 and entrance l of the second coil heat exchanger 3 is connected, and second
The outlet m of coil heat exchanger 3 is connected with the import of air cooler 4, the outlet of air cooler 4 and regenerator
The first passage import of 5 is connected, the first passage outlet of regenerator 5 and entering of the 5th throttling arrangement 6
Mouth is connected, and the outlet of the 5th throttling arrangement 6 is connected with the import of the second evaporimeter 7, the second evaporimeter
The outlet of 7 is connected with the second channel import of regenerator 5, second channel outlet and the pressure of regenerator 5
The air entry of contracting machine 1 is connected.
Absorb subsystem using lithium bromide-water solution as high pressure below and low pressure absorbs subsystem circulation
Working fluid, water is cold-producing medium；Say using carbon dioxide as the working fluid of Trans-critical cycle compression subsystem
The course of work of bright system:
For Trans-critical cycle compression subsystem, after compressor 1 does work, produce overheated carbon dioxide
Steam, the first coil heat exchange that first overheated carbon dioxide-vapor is arranged inside high pressure generator 8
Exothermic condensation cooling at device 2, subsequently into internal the second coil heat exchange arranged of low pressure generator 16
Device 3 heat release condenses cooling further, then cools down further through air cooler 4, then flows through regenerator
First passage in 5 and the carbon dioxide-vapor heat-shift in second channel, by the 5th throttling dress
Put the carbon dioxide liquid becoming low-temp low-pressure after 6, enter heat absorption evaporation in the second evaporimeter 7 afterwards,
Produce Part I cold.Carbon dioxide-vapor after evaporation is through the second channel exchanged heat of regenerator 5
After amount, return to compressor 1.
Subsystem and low pressure are absorbed for high pressure and absorbs subsystem, the lithium bromide in high pressure generator 8-
The aqueous solution produces water vapour (cold-producing medium) under Trans-critical cycle high-temperature exhaust air heats and lithium bromide concentrated solution (is inhaled
Receive agent).
Water vapour enters cold after the second throttling arrangement 10 throttling after being introduced into condenser 9 condensation cooling
Solidifying evaporimeter 11 flash distillation, cooling, add at Trans-critical cycle high-temperature exhaust air with from low pressure generator 16 simultaneously
The lower some refrigerant water vapour mixing produced of heat.And from the cold-producing medium water steaming of low pressure generator 16
Another part of vapour then leads to high pressure absorber 12 and is absorbed, and absorbs the lithium bromide after water vapour dilute molten
Liquid returns after the boosting of the first circulating pump 13 enters the first passage preheating of the first solution heat exchanger 14
To high pressure generator 8.
High pressure generator 8 occur after lithium bromide concentrated solution then by the of the first solution heat exchanger 14
After two passage coolings, then after the second throttling arrangement 15 reducing pressure by regulating flow, enter high pressure absorber 12.Cold
Liquid phase refrigerant water in solidifying evaporimeter 11 is in the 3rd throttling arrangement 17 enters the first evaporimeter 18
Sweat cooling, subsequently into low-pressure absorber 19 by the lithium bromide after occurring from low pressure generator 16
Concentrated solution absorbs, through the first passage of the second solution heat exchanger 21 after boosting by the second circulating pump 20
Return to after preheating in low pressure generator 16.Lithium bromide concentrated solution after low pressure generator 16 occurs then is led to
Enter low pressure through the 4th throttling arrangement 22 after crossing the second channel precooling of the second solution heat exchanger 21 to absorb
Device 19 is as absorbent solution.
Two-stage is provided to absorb the compound-refrigerating system of heat in order to further illustrate the trans critical cycle of the present invention
The advantage of system, tests: the outlet pressure of compressor 1 is 9MPa under following operating mode, evaporation
Temperature 7 DEG C, air cooler temperature is 35 DEG C；The condensation temperature of two-stage absorption system is 35 DEG C, high-low pressure
Absorbing temperature is 35 DEG C, and evaporating temperature is 7 DEG C.Trans critical cycle provides two-stage to absorb the compound system of heat
The COP of cooling system is with condenser/evaporator temperature change as shown in Figure 2.
In the case of simple Trans-critical cycle compression circulates in the condensation temperature of setting, evaporating temperature, outlet pressure
COP is 3.2, and as shown in Figure 2, when height arbitrarily downgrades proper temperature, the COP of combined-circulation can
Reaching more than 4, be such as 70 DEG C when high pressure absorbs temperature in figure, low pressure absorbs temperature when being 48 DEG C,
COP value reaches 4.1, compared to simple trans critical cycle performance boost more than 28.1%.
Comparative example 1
Tradition two-stage lithium bromide-water absorption type refrigeration can utilize the thermal source of more than 70 DEG C, circulation
COP can reach about 0.38；And the circulation COP of single-stage lithium bromide-water absorption type refrigeration system is about
0.7～0.8, but the heat source temperature used is higher.
There is provided single-stage lithium bromide-water absorption type composite refrigeration system as right using trans critical cycle below
Ratio, hybrid system is made up of Trans-critical cycle subsystem and single-stage lithium bromide-water absorption type subsystem, with CO2
As trans critical cycle working medium, simple workflow is similar, such as Fig. 3 with described embodiment 1 system
Shown in,
For Trans-critical cycle compression subsystem, the overheated carbon dioxide-vapor after compressor work,
The coil heat exchanger exothermic condensation cooling arranged inside generator, rear entrance air cooler is the coldest
But, the carbon dioxide liquid of low-temp low-pressure after then passing through regenerator, first throttle device, is become, it
Heat absorption evaporation in rear entrance the first evaporimeter, produces Part I cold.Carbon dioxide after evaporation steams
Vapour returns to compressor through regenerator.
For single-stage absorption subsystem, generator produces system under Trans-critical cycle high-temperature exhaust air waste-heat
It is cold that the condensed device of water as refrigerant steam, the second throttling arrangement arrive the second evaporator evaporation generation Part II
Amount, outlet vapor returns to absorber and is absorbed.
When the outlet pressure of compressor is 9MPa, evaporating temperature 7 DEG C, air cooler temperature is 35 DEG C；
Single-stage absorption refrigeration subsystem condensation temperature is 35 DEG C, and absorber temperatures is 35 DEG C, evaporating temperature
When being 7 DEG C, hybrid system circulation COP changes as shown in Figure 4.In Fig. 4, reach in occurrence temperature
In the case of requiring that (more than 80 DEG C) and hiigh pressure stage venting scope are reasonably, the coefficient of performance reaches as high as
3.7, compare the performance boost 17.1% of simple trans critical cycle, along with the rising of occurrence temperature, occur
The waste heat amount of device utilizable trans critical cycle high-temperature exhaust air reduces, and COP declines on the contrary, same to operating mode
Under absorb the composite refrigeration system performance boost effect of heat compared to described two-stage and be slightly short of, difference
About 11%.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for
For those skilled in the art, the present invention can have various modifications and variations.All essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included in the present invention
Protection domain within.
Claims (9)
1. trans critical cycle provide two-stage absorption cycle occur heat a composite refrigeration system, by across
Critical compressive subsystem, high pressure absorb subsystem and low pressure absorbs subsystem composition, it is characterised in that
Described high pressure absorbs steam (vapor) outlet (b) and the condenser of the high pressure generator (8) of subsystem
(9) entrance is connected, and the outlet of condenser (9) is connected with the import of first throttle device (10),
The outlet of first throttle device (10) is connected with the liquid inlet (q) of condenser/evaporator (11),
The liquid outlet (h) of high pressure absorber (12) is connected with the import of the first circulating pump (13), the
The outlet of one circulating pump (13) is connected with the first passage entrance of the first solution heat exchanger (14), the
The first passage outlet of one solution heat exchanger (14) and the liquid inlet (a) of high pressure generator (8)
It is connected, the liquid outlet (c) of high pressure generator (8) and the second of the first solution heat exchanger (14)
Feeder connection is connected, second channel outlet and second throttling arrangement (15) of the first solution heat exchanger (14)
Entrance be connected, the liquid inlet of the outlet of the second throttling arrangement (15) and high pressure absorber (12)
F () is connected；
The outlet (i) of the low pressure generator (16) that described low pressure absorbs subsystem is divided into two-way, and one
Road connects with the gas access (g) of high pressure absorber (12), another road and condenser/evaporator (11)
Gas access (s) be connected, the liquid outlet (r) of condenser/evaporator (11) with the 3rd throttling dress
The import putting (17) is connected, the outlet of the 3rd throttling arrangement (17) and the first evaporimeter (18)
Entrance is connected, the outlet of the first evaporimeter (18) and the gas access (o) of low-pressure absorber (19)
It is connected, the import phase of the liquid outlet (p) of low-pressure absorber (19) and the second circulating pump (20)
Even, the first passage entrance phase of the outlet of the second circulating pump (20) and the second solution heat exchanger (21)
Even, the first passage outlet of the second solution heat exchanger (21) enters with the liquid of low pressure generator (16)
Mouth (j) is connected, the liquid outlet (k) of low pressure generator (16) and the second solution heat exchanger (21)
Second channel entrance be connected, the outlet of the second channel of the second solution heat exchanger (21) and the 4th throttling
The entrance of device (22) is connected, the outlet of the 4th throttling arrangement (22) and low-pressure absorber (19)
Liquid inlet (n) be connected；
The first coil heat exchanger (2), described low pressure generator (16) it is provided with in high pressure generator (8)
Inside it is provided with the second coil heat exchanger (3)；
The outlet of the compressor (1) of described Trans-critical cycle compression subsystem and the first coil heat exchanger (2)
Entrance (d) be connected, the outlet (e) of the first coil heat exchanger (2) and the second coil heat exchanger
(3) entrance (l) is connected, the outlet (m) of the second coil heat exchanger (3) and air cooler (4)
Import be connected, the outlet of air cooler (4) is connected with the first passage import of regenerator (5), time
The first passage outlet of hot device (5) is connected with the import of the 5th throttling arrangement (6), the 5th throttling dress
The import of the outlet and the second evaporimeter (7) of putting (6) is connected, the outlet of the second evaporimeter (7)
Second channel import with regenerator (5) is connected, second channel outlet and the compression of regenerator (5)
The air entry of machine (1) is connected.
A kind of trans critical cycle the most as claimed in claim 1 provides two-stage absorption cycle that heat occurs
Composite refrigeration system, it is characterised in that the inside of described air cooler (4) and condenser (9) is all provided with
Cooling coil, the import and export of described cooling coil is had to connect with cooling medium source.
A kind of trans critical cycle the most as claimed in claim 1 provides two-stage absorption cycle that heat occurs
Composite refrigeration system, it is characterised in that described high pressure absorbs subsystem and low pressure absorbs used by subsystem
Working fluid is the combination of cold-producing medium and absorbent.
A kind of trans critical cycle the most as claimed in claim 3 provides two-stage absorption cycle that heat occurs
Composite refrigeration system, it is characterised in that described high pressure absorbs subsystem and low pressure absorbs used by subsystem
Working fluid is the working medium pair of ionic liquid or salt and water composition.
A kind of trans critical cycle the most as claimed in claim 3 provides two-stage absorption cycle that heat occurs
Composite refrigeration system, it is characterised in that described high pressure absorbs subsystem and low pressure absorbs used by subsystem
Working fluid is lithium bromide-water solution or ammoniacal liquor.
A kind of trans critical cycle the most as claimed in claim 3 provides two-stage absorption cycle that heat occurs
Composite refrigeration system, it is characterised in that described cold-producing medium is freon class cold-producing medium.
A kind of trans critical cycle the most as claimed in claim 6 provides two-stage absorption cycle that heat occurs
Composite refrigeration system, it is characterised in that described absorbent be dimethylformamide, dimethylacetylamide,
TRIGLYME or pyrrolidones.
A kind of trans critical cycle the most as claimed in claim 1 provides two-stage absorption cycle that heat occurs
Composite refrigeration system, it is characterised in that the working fluid of described Trans-critical cycle compression subsystem is titanium dioxide
Carbon or nitrous oxide.
A kind of trans critical cycle the most as claimed in claim 6 provides two-stage absorption cycle that heat occurs
Composite refrigeration system, it is characterised in that described cold-producing medium is R23, R508B, R32, R290,
Or R41.
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| CN105004095B (en) * | 2015-07-03 | 2017-06-27 | 浙江大学 | A kind of trans critical cycle and the combined heat-pump system of two-stage absorption heat pump coproduction |
| CN105042931B (en) * | 2015-07-03 | 2018-07-06 | 浙江大学 | A kind of trans critical cycle and the combined heat-pump system of absorption heat pump coproduction |
| CN108662808A (en) * | 2017-03-27 | 2018-10-16 | 胡军勇 | A kind of two-stage superposition type absorption/compression composite refrigeration cycle system with engine waste heat and power link driving |
| CN107726665B (en) * | 2017-09-18 | 2023-05-16 | 东南大学 | Two-stage compression refrigeration heat pump circulation device and method based on reversible chemisorption heat release |
| CN109084497B (en) * | 2018-09-19 | 2024-04-09 | 奥克斯空调股份有限公司 | Compression-absorption refrigeration cycle system and refrigeration cycle method |
| CN111442553B (en) * | 2020-05-08 | 2024-05-28 | 华北电力大学 | Air source heat pump and heat extraction method thereof |
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| JPH09250837A (en) * | 1996-03-15 | 1997-09-22 | Ebara Corp | Refrigerator |
| CN102650478A (en) * | 2012-05-14 | 2012-08-29 | 浙江大学 | Trans-critical-compression/absorption composite refrigeration device utilizing low-grade heat |
| CN204006779U (en) * | 2014-07-30 | 2014-12-10 | 中国电子科技集团公司第三十八研究所 | A kind of efficient HGAX absorption type refrigerating unit |
| CN204513843U (en) * | 2015-01-20 | 2015-07-29 | 浙江大学 | A kind of trans critical cycle provides two-stage absorption cycle that the composite refrigeration system of heat occurs |
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