CN110160292A - CO 2 cross-critical pressurization refrigeration removes defrosting system and its Defrost method - Google Patents
CO 2 cross-critical pressurization refrigeration removes defrosting system and its Defrost method Download PDFInfo
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- CN110160292A CN110160292A CN201910374966.4A CN201910374966A CN110160292A CN 110160292 A CN110160292 A CN 110160292A CN 201910374966 A CN201910374966 A CN 201910374966A CN 110160292 A CN110160292 A CN 110160292A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/06—Superheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The present invention relates to CO 2 cross-critical pressurization refrigeration to remove defrosting system, including refrigerating circuit；It further include defrost circuit, defrost circuit includes supercooling three-way solenoid valve, and supercooling three-way solenoid valve is mounted on the exit of gas cooler；Cold heat exchanger is crossed to connect with high-pressure throttle；Supercooling three-way solenoid valve is connect with cold heat exchanger and high-pressure throttle excessively respectively；Defrost valve for pressure difference, which is mounted on, dodges on gas bypass pipe, and is located at and dodges between gas by-passing valve and shwoot bucket；Defrost heating pipe B is connect with sudden strain of a muscle gas bypass pipe and evaporator respectively, and between shwoot bucket and defrost valve for pressure difference；Defrost return pipe C is connect with evaporator and cold heat exchanger excessively respectively；Defrost pipe D is connect with cold heat exchanger excessively and sudden strain of a muscle gas bypass pipe respectively, and defrost pipe D is located at defrost valve for pressure difference and dodges between gas by-passing valve.It should be except the temperature difference is small, small on the influence of library temperature, thermal stress is small when defrosting system is not necessarily to additional energy, defrost, do not damage evaporator service life, defrosting efficiency is high, efficiency is high.
Description
Technical field
The present invention relates to a kind of refrigeration to remove defrosting system, and especially CO 2 cross-critical pressurization refrigeration except defrosting system and its is removed
White method.
Background technique
Transcritical CO_2 refrigeration system generallys use electrochemical cream and hot gas defrost mode to end evaporator at present
Frost.
Electrochemical cream working principle:
Several electric heating wires are penetrated inside evaporator, in defrost, cut off the normal refrigeration of evaporator, are then added to electricity
Heated filament is powered, and heating evaporation device makes the frost layer of evaporator surface melt away.
Electrochemical cream consumes more electric energy, further increases product energy consumption, and be difficult thoroughly to eliminate to capillary and
The frost or ice at liquid-dividing head position, because this part can not directly be contacted with heater strip.
Hot gas defrost working principle:
The normal refrigeration for cutting off evaporator, by the exhaust of medium temperature compressor or cryogenic compressor in carbon dioxide system
It introduces inside evaporator, evaporator is heated.To eliminate the frost of evaporator surface.
Hot gas defrost delivery temperature is high, influences greatly on library temperature, library temperature increases more during defrost.Because of delivery temperature and steaming
The temperature difference before sending out the evaporating temperature of device is very big, and thermal stress is big when leading to defrost, damages to evaporator safety and service life big.
Summary of the invention
To solve the above problems, the present invention provide it is a kind of do not increase additional energy, on library temperature influence it is small, do not damage evaporation
Device service life, the CO 2 cross-critical that can effectively defrost pressurization refrigeration remove defrosting system, the specific technical proposal is:
CO 2 cross-critical pressurization refrigeration removes defrosting system, including refrigerating circuit, and the refrigerating circuit includes being sequentially connected
Compressor, gas cooler, high-pressure throttle, shwoot bucket, expansion valve and evaporator, the air inlet of the evaporator and compressor
Mouth connection；Equipped with sudden strain of a muscle gas bypass pipe, the air inlet connection for dodging gas bypass pipe and compressor, the sudden strain of a muscle gas on the shwoot bucket
Equipped with sudden strain of a muscle gas by-passing valve on bypass pipe；It further include defrost circuit, the defrost circuit includes supercooling three-way solenoid valve, the supercooling
Three-way solenoid valve is mounted on the exit of gas cooler；Cold heat exchanger is crossed, the cold heat exchanger of crossing is connect with high-pressure throttle；
The supercooling three-way solenoid valve is connect with cold heat exchanger and high-pressure throttle excessively respectively；Defrost valve for pressure difference, the defrost valve for pressure difference
It is mounted on and dodges on gas bypass pipe, and be located at and dodge between gas by-passing valve and shwoot bucket；Defrost heating pipe B, the defrost heating pipe B point
It is not connect with sudden strain of a muscle gas bypass pipe and evaporator, the defrost heating pipe B is between shwoot bucket and defrost valve for pressure difference；Defrost reflux
Pipe C, the defrost return pipe C are connect with evaporator and cold heat exchanger excessively respectively；And defrost pipe D, the defrost pipe D respectively with mistake
Cold heat exchanger is connected with gas bypass pipe is dodged, and the defrost pipe D is located at defrost valve for pressure difference and dodges between gas by-passing valve.
By using above-mentioned technical proposal, when defrost, stop refrigeration, supercooling three-way solenoid valve commutation, superfluid enters
It crosses in cold heat exchanger and the gas-liquid mixture after defrost is evaporated, gas-liquid mixture is made all to become gas, protect compressor,
It can use the superfluid that the gas-liquid mixture that defrost obtains comes out gas cooler simultaneously to be subcooled, further improve
The efficiency of system.
The pressure of shwoot bucket is increased to 45bar (absolute pressure) left and right by the setting value that gas by-passing valve is dodged by adjusting, right
Answer CO2Saturation temperature is 10 DEG C or so, can carry out heating defrost to evaporator and associated pipe.
Since defrost carbon dioxide gas have passed through gas cooler, high-pressure throttle and shwoot bucket, relative to compressor
The temperature of 120 DEG C of outlet is much lower, small on the influence of cold storage locker temperature, while the temperature difference is small, and the thermal stress that evaporator is subject to is small, improves
The safety of evaporator, extends the service life of evaporator.
It preferably, further included hot loop, the hot loop excessively includes backheat electromagnetic three-way regulating valve, the backheat electromagnetism
Three-way control valve is mounted on the exit of compressor；Recuperative heat exchanger, the Recuperative heat exchanger are connect with gas cooler；It is described
Backheat electromagnetic three-way regulating valve is connect with Recuperative heat exchanger and gas cooler respectively；Defrost pipe A, the defrost pipe A respectively with
It dodges gas bypass pipe to connect with Recuperative heat exchanger, the defrost pipe A is between shwoot bucket and defrost valve for pressure difference；The defrost hot gas
Pipe B is connect with Recuperative heat exchanger.
By using above-mentioned technical proposal, the gas that Recuperative heat exchanger comes out shwoot bucket is further heated, and temperature is mentioned
Height arrives 30-40 DEG C or so, improves the efficiency of defrost, shortens the defrost time, reduces the influence to cold storage locker temperature, while can be right
The high temperature and high pressure gas come out from compressor is cooled down, and energy consumption is reduced.
Preferably, the compressor includes cryogenic compressor and medium temperature compressor, and the cryogenic compressor and medium temperature are compressed
Machine connection；The evaporator includes cryogenic vaporizer and medium temperature evaporator；The expansion valve includes that low-temperature expansion valve and medium temperature are swollen
Swollen valve；The cryogenic vaporizer is connect with low-temperature expansion valve and cryogenic compressor respectively, and the low-temperature expansion valve and shwoot bucket connect
It connects；The medium temperature evaporator is connect with medium temperature expansion valve and medium temperature compressor respectively, and the medium temperature expansion valve is connect with shwoot bucket；
The sudden strain of a muscle gas bypass pipe is connect with the air inlet of medium temperature compressor.
By using above-mentioned technical proposal, steamed using medium temperature compressor and cryogenic compressor and medium temperature evaporator and low temperature
Hair device can be improved the scope of application, and a set of refrigeration system can be made to be applicable in medium temperature freezer and low-temperature cold store, improve refrigeration system
Utilization rate.
CO 2 cross-critical pressurization refrigeration removes the Defrost method of defrosting system, includes the following steps；Set defrost condition, root
Start defrost according to defrost condition；Start backheat electromagnetic three-way regulating valve, the high temperature and high pressure gas of the medium temperature compressor discharge is logical
It crosses backheat electromagnetic three-way regulating valve and is divided into two-way, wherein entering gas cooler by Recuperative heat exchanger all the way, another way is direct
Into gas cooler；Starting supercooling three-way solenoid valve, the superfluid that the gas cooler comes out pass through supercooling electromagnetic three-way
Valve passed through cold heat exchanger and enters high-pressure throttle；Gas in the shwoot bucket enters back under the action of defrost valve for pressure difference
In heat exchanger, then into defrost in cryogenic vaporizer and medium temperature evaporator, the gas-liquid mixture after defrost was entered
Become gas in cold heat exchanger, then gas enters the air inlet of medium temperature compressor by dodging gas by-passing valve.
By using above-mentioned technical proposal, the carbon dioxide gas of medium temperature compressor discharge is high temperature and high pressure gas, is stablized
At 120 DEG C or so, high-temperature gas is further heated by the gas that plate heat exchanger comes out shwoot bucket, improves temperature, in turn
Improve defrost efficiency.
High temperature and high pressure gas becomes superfluid after supercooling, and for temperature at 30-40 DEG C, superfluid passed through cold heat exchanger pair
Liquid or gas-liquid mixture after defrost return-air are evaporated, and make all to become gas, to protect compressor.
Preferably, the defrost condition includes detection evaporator stabilization or timing defrost.
Preferably, the absolute pressure of the shwoot bucket is 40-50bar.
Preferably, the front and back pressure difference of the defrost valve for pressure difference is 1-2bar.
Preferably, the gas in the shwoot bucket, which enters, is heated to 30-40 DEG C in Recuperative heat exchanger.
Compared with prior art the invention has the following advantages:
When CO 2 cross-critical provided by the invention pressurization refrigeration is not necessarily to additional energy, defrost except defrosting system the temperature difference it is small,
Influence that small, thermal stress is small, do not damage evaporator service life, defrosting efficiency is high, efficiency is high on library temperature.
Detailed description of the invention
Fig. 1 is the refrigeration connection schematic diagram of embodiment one；
Fig. 2 is the defrost connection schematic diagram of embodiment one；
Fig. 3 is the refrigeration connection schematic diagram of embodiment two；
Fig. 4 is the defrost connection schematic diagram of embodiment two；
Fig. 5 is the refrigeration connection schematic diagram of embodiment three；
Fig. 6 is the defrost connection schematic diagram of embodiment three.
Specific embodiment
Now in conjunction with attached drawing, the invention will be further described.
Embodiment one
As depicted in figs. 1 and 2, CO 2 cross-critical pressurization refrigeration removes defrosting system, including refrigerating circuit, refrigerating circuit packet
Sequentially connected compressor 10, gas cooler 11, high-pressure throttle 12, shwoot bucket 13, expansion valve 14 and evaporator 15 are included, is steamed
Hair device 15 is connect with the air inlet of compressor 10；Equipped with gas bypass pipe 131 is dodged on shwoot bucket 13, gas bypass pipe 131 and compression are dodged
The air inlet of machine 10 connects, and dodges on gas bypass pipe 131 equipped with sudden strain of a muscle gas by-passing valve 16；It further include defrost circuit, defrost circuit includes
Three-way solenoid valve 31 is subcooled, supercooling three-way solenoid valve 31 is mounted on the exit of gas cooler 11；Cold heat exchanger 32 is crossed, is subcooled
Heat exchanger 32 is plate heat exchanger, crosses cold heat exchanger 32 and connect with high-pressure throttle 12；Be subcooled three-way solenoid valve 31 respectively with mistake
Cold heat exchanger 32 and high-pressure throttle 12 connect；Defrost valve for pressure difference 33, defrost valve for pressure difference 33, which is mounted on, dodges on gas bypass pipe 131,
And it is located at and dodges between gas by-passing valve 16 and shwoot bucket 13；Defrost heating pipe B34, defrost heating pipe B34 respectively with dodge gas bypass pipe
131 and evaporator 15 connect, defrost heating pipe B34 is between shwoot bucket 13 and defrost valve for pressure difference 33；Defrost return pipe C35,
Defrost return pipe C35 is connect with evaporator 15 and cold heat exchanger 32 excessively respectively；Defrost pipe D36, defrost pipe D36 are changed with supercooling respectively
Hot device 32 and sudden strain of a muscle gas bypass pipe 131 connect, and defrost pipe D36 is located at defrost valve for pressure difference 33 and dodges between gas by-passing valve 16.
It is carried out between defrost heating pipe B34 and defrost return pipe C35 and evaporator 15 by three-way solenoid valve or solenoid valve
Connection carries out the switching of refrigeration pipeline and defrost pipeline when defrost by three-way solenoid valve or by solenoid valve.
When defrost, stop refrigeration, supercooling three-way solenoid valve 31 commutates, and the superfluid that gas cooler 11 comes out entered
Cold heat exchanger 32 is crossed cold heat exchanger 32 and is evaporated to the gas-liquid mixture after defrost, gas-liquid mixture is made all to become dioxy
Change carbon gas, protect compressor 10, while can use the gas-liquid mixture that defrost obtains and surpassing to what gas cooler 11 came out
Fluid is subcooled, and the efficiency of system is further improved.
The pressure of shwoot bucket 13 is increased to the left side 45bar (absolute pressure) by the setting value that gas by-passing valve 16 is dodged by adjusting
The right side, corresponding CO2Saturation temperature is 10 DEG C or so, can carry out heating defrost to evaporator 15 and associated pipe.
10 are cooled to since defrost carbon dioxide gas have passed through gas cooler 11, high-pressure throttle 12 and shwoot bucket 13
DEG C or so, the temperature for exporting 120 DEG C relative to compressor 10 is much lower, and it is small on the influence of cold storage locker temperature, while the temperature difference is small, evaporation
The thermal stress that device 15 is subject to is small, improves the safety of evaporator 15, extends the service life of evaporator 15.
As described in Figure 2, when defrost, the high temperature and high pressure gas come out from compressor 10 is cooling by gas cooler 11, cold
But the gas after entered cold heat exchanger 32 by the way that three-way solenoid valve 31 is subcooled, and entered high pressure after crossing cold heat exchanger 32
Throttle valve 12, gas enter shwoot bucket 13 after high-pressure throttle 12, and the carbon dioxide gas at 13 top of shwoot bucket is divided into
Two-way, all the way by dodge gas bypass pipe 131 by defrost valve for pressure difference 33 and dodge gas by-passing valve 16 enter compressor 10 into
Port, another way enters defrost heating pipe B34 under the action of defrost valve for pressure difference 33, and enters steaming by three-way solenoid valve
It sends out in device 15, defrost is carried out to the management at 15 both ends of evaporator 15 and evaporator, carbon dioxide gas becomes after evaporator 15
At liquid or gas-liquid mixture, evaporation was then entered in cold heat exchanger 32 by defrost return pipe C35 and becomes gas, then into
Enter to dodge gas bypass pipe 131, enters the air inlet of compressor 10 by dodging gas by-passing valve 16 jointly with the gas dodged in gas bypass pipe 131
Mouthful.
Embodiment two
It on the basis of the above embodiment 1, as shown in Figure 3 and Figure 4, further included hot loop, crossing hot loop includes backheat
Electromagnetic three-way regulating valve 21, backheat electromagnetic three-way regulating valve 21 are mounted on the exit of compressor 10；Recuperative heat exchanger 22, backheat
Heat exchanger 22 is plate heat exchanger, and Recuperative heat exchanger 22 is connect with gas cooler 11；Backheat electromagnetic three-way regulating valve 21 is distinguished
It is connect with Recuperative heat exchanger 22 and gas cooler 11；Defrost pipe A23, defrost pipe A23 respectively with dodge gas bypass pipe 131 and backheat
Heat exchanger 22 connects, and defrost pipe A23 is between shwoot bucket 13 and defrost valve for pressure difference 33；Defrost heating pipe B34 and backheat exchange heat
Device 22 connects.
The gas that Recuperative heat exchanger 22 comes out shwoot bucket 13 further heats, and temperature is increased to 30-40 DEG C or so, is mentioned
The high efficiency of defrost, shortens the defrost time, reduces the influence to cold storage locker temperature, while can be to the height from compressor 10 out
Warm high pressure gas is cooled down, and energy consumption is reduced.
As described in Figure 4, when defrost, the high temperature and high pressure gas come out from compressor 10 passes through backheat electromagnetic three-way regulating valve 21
It is divided into two-way, gas cooler 11 is cooling, and another way enters gas after Recuperative heat exchanger 22 wherein being directly entered all the way
Cooler 11 is cooling, and gas after cooling entered cold heat exchanger 32 by the way that three-way solenoid valve 31 is subcooled, and exchanges heat by supercooling
High-pressure throttle 12 is entered after device 32, gas enters shwoot bucket 13 after high-pressure throttle 12,13 top of shwoot bucket
Carbon dioxide gas is divided into two-way, all the way by dodge gas bypass pipe 131 by defrost valve for pressure difference 33 and dodge gas by-passing valve 16 into
Enter the air inlet to compressor 10, another way enters defrost heating pipe B34 under the action of defrost valve for pressure difference 33, and passes through electricity
Magnetic triple valve enters in evaporator 15, and carbon dioxide gas becomes liquid or gas-liquid mixture after evaporator 15, then
Evaporation in cold heat exchanger 32 was entered by defrost return pipe C35 and becomes gas, enters back into and dodges gas bypass pipe 131, with sudden strain of a muscle gas
Gas in bypass pipe 131 enters the air inlet of compressor 10 by dodging gas by-passing valve 16 jointly.
Embodiment three
On the basis of examples detailed above two, as shown in Figure 5 and Figure 6, compressor 10 includes cryogenic compressor 101 and middle temperature and pressure
Contracting machine 102, cryogenic compressor 101 are connect with medium temperature compressor 102；Evaporator 15 includes that cryogenic vaporizer 151 and medium temperature are evaporated
Device 152；Expansion valve 14 includes low-temperature expansion valve 141 and medium temperature expansion valve 142；Cryogenic vaporizer 151 respectively with low-temperature expansion valve
141 and cryogenic compressor 101 connect, low-temperature expansion valve 141 connect with shwoot bucket 13；Medium temperature evaporator 152 is swollen with medium temperature respectively
Swollen valve 142 and medium temperature compressor 102 connect, and medium temperature expansion valve 142 is connect with shwoot bucket 13；Dodge gas bypass pipe 131 and middle temperature and pressure
The air inlet of contracting machine 102 connects.
It can using medium temperature compressor 102 and cryogenic compressor 101 and medium temperature evaporator 152 and cryogenic vaporizer 151
The scope of application is improved, a set of refrigeration system can be made to be applicable in medium temperature freezer and low-temperature cold store, improve the utilization rate of refrigeration system.
CO 2 cross-critical pressurization refrigeration removes the Defrost method of defrosting system, includes the following steps；
Defrost condition is set, defrost is started according to defrost condition；
Start backheat electromagnetic three-way regulating valve 21, the high temperature and high pressure gas that medium temperature compressor 102 is discharged passes through backheat electromagnetism
Three-way control valve 21 divides for two-way, wherein entering gas cooler 11 by Recuperative heat exchanger 22 all the way, another way is directly entered
Gas cooler 11；
Starting supercooling three-way solenoid valve 31, the superfluid that gas cooler 11 comes out are passed through by supercooling three-way solenoid valve 31
It crosses cold heat exchanger 32 and enters high-pressure throttle 12；
Open defrost valve for pressure difference 33；
Gas in shwoot bucket 13 enters in Recuperative heat exchanger 22 under the action of defrost valve for pressure difference 33 to be heated, then into
Enter the defrost into cryogenic vaporizer 151 and medium temperature evaporator 152, the gas-liquid mixture after defrost entered cold heat exchanger 32 with
The fluid that gas cooler 11 comes out carries out heat exchange and flashes to gas, and then gas enters medium temperature by dodging gas by-passing valve 16
The air inlet of compressor 102.
The carbon dioxide gas that medium temperature compressor 102 is discharged is high temperature and high pressure gas, is stablized at 120 DEG C or so, High Temperature Gas
Body is further heated by the gas that Recuperative heat exchanger 22 comes out shwoot bucket 13, improves temperature, and then improve defrost efficiency.
High temperature and high pressure gas becomes superfluid after supercooling, and for temperature at 30-40 DEG C, superfluid passed through cold heat exchanger 32
To after defrost return-air liquid or gas-liquid mixture be evaporated, make all become gas, to protect compressor 10.
Wherein, defrost condition includes detection evaporator 15 stabilization or timing defrost.The absolute pressure of shwoot bucket 13 is 40-
50bar.The front and back pressure difference of defrost valve for pressure difference 33 is 1-2bar.Gas in shwoot bucket 13 is entered in Recuperative heat exchanger 22 and is heated
To 30-40 DEG C.
Claims (8)
1. CO 2 cross-critical pressurization refrigeration removes defrosting system, including refrigerating circuit, the refrigerating circuit include sequentially connected
Compressor, gas cooler, high-pressure throttle, shwoot bucket, expansion valve and evaporator, the air inlet of the evaporator and compressor
Connection；It is equipped on the shwoot bucket and dodges gas bypass pipe, the air inlet of the sudden strain of a muscle gas bypass pipe and compressor connects, by the sudden strain of a muscle gas
Equipped with sudden strain of a muscle gas by-passing valve on siphunculus；
It is characterized in that, further including defrost circuit, the defrost circuit includes
Three-way solenoid valve is subcooled, the supercooling three-way solenoid valve is mounted on the exit of gas cooler；
Cold heat exchanger is crossed, the cold heat exchanger of crossing is connect with high-pressure throttle；
The supercooling three-way solenoid valve is connect with cold heat exchanger and high-pressure throttle excessively respectively；
Defrost valve for pressure difference, the defrost valve for pressure difference, which is mounted on, dodges on gas bypass pipe, and is located at and dodges between gas by-passing valve and shwoot bucket；
Defrost heating pipe B, the defrost heating pipe B are connect with sudden strain of a muscle gas bypass pipe and evaporator respectively, defrost heating pipe B
Between shwoot bucket and defrost valve for pressure difference；
Defrost return pipe C, the defrost return pipe C are connect with evaporator and cold heat exchanger excessively respectively；And
Defrost pipe D, the defrost pipe D are connect with cold heat exchanger excessively and sudden strain of a muscle gas bypass pipe respectively, and the defrost pipe D is located at defrost pressure
Between difference limen and sudden strain of a muscle gas by-passing valve.
2. CO 2 cross-critical pressurization refrigeration according to claim 1 removes defrosting system, which is characterized in that further include overheat
Circuit, the hot loop excessively include
Backheat electromagnetic three-way regulating valve, the backheat electromagnetic three-way regulating valve are mounted on the exit of compressor；
Recuperative heat exchanger, the Recuperative heat exchanger are connect with gas cooler；
The backheat electromagnetic three-way regulating valve is connect with Recuperative heat exchanger and gas cooler respectively；
Defrost pipe A, the defrost pipe A are connect with sudden strain of a muscle gas bypass pipe and Recuperative heat exchanger respectively, and the defrost pipe A is located at shwoot bucket
Between defrost valve for pressure difference；
The defrost heating pipe B is connect with Recuperative heat exchanger.
3. CO 2 cross-critical pressurization refrigeration according to claim 1 removes defrosting system, which is characterized in that
The compressor includes cryogenic compressor and medium temperature compressor, and the cryogenic compressor is connect with medium temperature compressor；
The evaporator includes cryogenic vaporizer and medium temperature evaporator；
The expansion valve includes low-temperature expansion valve and medium temperature expansion valve；
The cryogenic vaporizer is connect with low-temperature expansion valve and cryogenic compressor respectively, and the low-temperature expansion valve and shwoot bucket connect
It connects；
The medium temperature evaporator is connect with medium temperature expansion valve and medium temperature compressor respectively, and the medium temperature expansion valve and shwoot bucket connect
It connects；
The sudden strain of a muscle gas bypass pipe is connect with the air inlet of medium temperature compressor.
4. removing the Defrost method of defrosting system based on CO 2 cross-critical described in claim 1 pressurization refrigeration, which is characterized in that
Include the following steps；
Defrost condition is set, defrost is started according to defrost condition；
Start backheat electromagnetic three-way regulating valve, the high temperature and high pressure gas of the medium temperature compressor discharge passes through backheat electromagnetic three-way tune
Section valve is divided into two-way, wherein entering gas cooler by Recuperative heat exchanger all the way, another way is directly entered gas cooler；
Starting supercooling three-way solenoid valve, the superfluid that the gas cooler comes out are changed by supercooling three-way solenoid valve by supercooling
Hot device enters high-pressure throttle；
Open defrost valve for pressure difference；
Gas in the shwoot bucket enters in Recuperative heat exchanger under the action of defrost valve for pressure difference to be heated, then into low
Defrost in warm evaporator and medium temperature evaporator, the gas-liquid mixture after defrost entered in cold heat exchanger to go out with gas cooler
The fluid come carries out heat exchange and flashes to gas, and then gas enters the air inlet of medium temperature compressor by dodging gas by-passing valve.
5. the Defrost method of carbon dioxide refrigerating system according to claim 4, which is characterized in that
The defrost condition includes detection evaporator stabilization or timing defrost.
6. the Defrost method of carbon dioxide refrigerating system according to claim 4, which is characterized in that
The absolute pressure of the shwoot bucket is 40-50bar.
7. the Defrost method of carbon dioxide refrigerating system according to claim 4, which is characterized in that
The front and back pressure difference of the defrost valve for pressure difference is 1-2bar.
8. the Defrost method of carbon dioxide refrigerating system according to claim 4, which is characterized in that
Gas in the shwoot bucket, which enters, is heated to 30-40 DEG C in Recuperative heat exchanger.
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| CN201910374966.4A CN110160292B (en) | 2019-05-07 | 2019-05-07 | Carbon dioxide transcritical pressurizing refrigeration defrosting system and defrosting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608216A (en) * | 2022-05-14 | 2022-06-10 | 中国能源建设集团山西省电力勘测设计院有限公司 | Defrosting method of high-energy-efficiency transcritical carbon dioxide double-stage compression cold-hot combined supply system |
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