CN109442786A - A kind of control method of Two-stage refrigerating system and Two-stage refrigerating system - Google Patents
A kind of control method of Two-stage refrigerating system and Two-stage refrigerating system Download PDFInfo
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- CN109442786A CN109442786A CN201811339278.6A CN201811339278A CN109442786A CN 109442786 A CN109442786 A CN 109442786A CN 201811339278 A CN201811339278 A CN 201811339278A CN 109442786 A CN109442786 A CN 109442786A
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- carbon dioxide
- water
- cooling
- dioxide coolant
- temperature
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- 238000000034 method Methods 0.000 title claims abstract description 44
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 247
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 121
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 121
- 239000002826 coolant Substances 0.000 claims abstract description 102
- 238000001816 cooling Methods 0.000 claims abstract description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000000498 cooling water Substances 0.000 claims abstract description 50
- 239000003507 refrigerant Substances 0.000 claims abstract description 48
- 238000005057 refrigeration Methods 0.000 claims abstract description 40
- 238000010521 absorption reaction Methods 0.000 claims abstract description 6
- 229960004424 carbon dioxide Drugs 0.000 claims description 121
- 230000006835 compression Effects 0.000 claims description 47
- 238000007906 compression Methods 0.000 claims description 47
- 239000007788 liquid Substances 0.000 claims description 23
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229910002090 carbon oxide Inorganic materials 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims 1
- 230000006872 improvement Effects 0.000 abstract description 14
- 230000006870 function Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 241000790917 Dioxys <bee> Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 210000003733 optic disk Anatomy 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
-
- 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
- F25B31/00—Compressor arrangements
-
- 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
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The present invention discloses a kind of Two-stage refrigerating system, heat is absorbed including refrigeration system and the first water-cooling system and the intercooler heat exchange, the water tank is discharged into after cooling water heat absorption in first water-cooling system, the second water-cooling system recycles cooling water and first heat exchanger heat exchange in the water tank；The valve group is arranged in the pipeline of the system for adjusting the pressure of the flow of the cooling water, the flow of carbon dioxide coolant and carbon dioxide coolant.Pass through the improvement of this system, it can make the efficient Trans-critical cycle working condition to work using carbon dioxide as the refrigeration system of refrigerant, overcome the routine techniques problem in carbon dioxide refrigeration field, provides a kind of feasible efficient scheme using carbon dioxide coolant for industry.
Description
Technical field
The present invention relates to refrigerating field, more particularly, to it is a kind of using carbon dioxide be working medium refrigeration system and controlling party
Method.
Background technique
It has been got application at this stage using CO2 as refrigerant using the refrigerating plant of Trans-critical cycle refrigeration cycle, Tianjin business is big
It learns technical solution disclosed in the Chinese patent CN105206165A of application and describes and combine realization carbon dioxide using multi-compressor
Trans-critical cycle refrigeration cycle, the exhaust which describes low-pressure stage compressor is sucked by high pressure stage compressor carries out two-stage compression
Machine, although by two second compressions realization CO 2 cross-critical refrigeration cycle, the excessive discharge temperature of low-pressure stage compressor, two
Carbonoxide working medium has been the gas of excess temperature saturation when sucking high pressure stage compressor, seriously affects the effect of high pressure stage compressor
Rate, this problem also become the technical problem for influencing the application of CO 2 cross-critical cooling cycle system, thus a kind of raising high pressure
The CO 2 cross-critical cooling cycle system of grade compressor efficiency urgently proposes.
Summary of the invention
Being designed to provide for embodiment of the present invention is a kind of using carbon dioxide as the Trans-critical cycle refrigeration cycle of refrigeration working medium
System and the control method for improving the system reliability and efficiency.
In order to solve the above-mentioned technical problem, on the one hand example of the present invention provides a kind of second level refrigeration system, including titanium dioxide
Carbon refrigerant, primary compressor, intercooler, split-compressor, first heat exchanger, after-treatment system, the first expansion valve,
Evaporator, gas-liquid separator, valve group, water tank, the first water-cooling system and the second water-cooling system, the primary compressor suck institute
It states carbon dioxide coolant and carries out primary compression, the intercooler is cooling to the carbon dioxide coolant of primary compression, institute
It states split-compressor sucking and carries out two-stage compression through the cooling carbon dioxide coolant of intercooler, the two of two-stage compression are discharged
Carbonoxide refrigerant is discharged into the after-treatment system after the carbon dioxide refrigeration of the cooling two-stage compression of the first heat exchanger,
The after-treatment system is dried to by first heat exchanger carbon dioxide coolant after cooling, and described first is swollen
Swollen valve is to the evaporator is discharged into after the carbon dioxide coolant reducing pressure by regulating flow through being dried, and the gas-liquid separator is to through institute
State the carbon dioxide coolant gas-liquid separation of evaporator, the primary compressor sucking is described, and treated two through gas-liquid separator
Carbonoxide refrigerant；First water-cooling system and the intercooler heat exchange absorb heat, first water-cooling system
In cooling water heat absorption after be discharged into the water tank, second water-cooling system recycle cooling water in the water tank with it is described
First heat exchanger heat exchange；The valve group be arranged in the pipeline of the system for adjust the cooling water flow,
The flow of carbon dioxide coolant and the pressure of carbon dioxide coolant
This programme cools down to the compressed carbon dioxide coolant of primary compressor by intercooler, guarantees to enter two
The carbon dioxide coolant of grade compressor is in suitable temperature range, the carbon dioxide that can so prevent split-compressor from sucking
The excessively high guarantee split-compressor of refrigerant temperature can Efficient Compression, improve the efficiency of whole system；First water-cooling system it is cold
But water by with intercooler heat exchange, absorb flow through intercooler carbon dioxide coolant heat, the cooling water
It is spare that water tank storage is passed through after being heated；Second water-cooling system is by recycling cooling water and the second exchanger heat in water tank
Exchange absorbs the heat for flowing through the carbon dioxide coolant of first heat exchanger, because carbon dioxide coolant at this time has passed through
Cross that second-compressed temperature is higher, cooling water at this time absorbs the high temperature carbon dioxide refrigeration after two-stage compression in heat exchanger
The heat of agent, further improves the temperature of cold water but, which is stored in spare in water tank by circulation.It is being made using the system
The heat of cold middle generation is rationally utilizing heat by appropriate setting heat exchange sites when prior by reasonable utilization
The refrigerating capacity of whole system is improved simultaneously.Furthermore by the improvement of this system, can make using carbon dioxide as refrigerant
Refrigeration system work efficient Trans-critical cycle working condition, overcome the routine techniques problem in carbon dioxide refrigeration field, be industry
Boundary provides a kind of feasible efficient scheme using carbon dioxide coolant.
The another aspect of this programme embodiment provides a kind of control method of Two-stage refrigerating system, the Two-stage refrigerating system
Including carbon dioxide coolant, primary compressor, intercooler, split-compressor, first heat exchanger, after-treatment system,
First expansion valve, evaporator, gas-liquid separator, valve group, water tank, the first water-cooling system, the second water-cooling system and the first temperature
Sensor and first pressure sensor, the primary compressor sucks the carbon dioxide coolant and carries out primary compression, described
It is discharged into the split-compressor after intercooler is cooling to the carbon dioxide coolant of primary compression, the split-compressor is inhaled
The carbon dioxide coolant for entering the primary compression through intercooler cooling carries out two-stage compression, and the titanium dioxide of two-stage compression is discharged
Carbon refrigerant is discharged into the after-treatment system after the carbon dioxide refrigeration of the cooling two-stage compression of the first heat exchanger, described
After-treatment system is dried to by first heat exchanger carbon dioxide coolant after cooling, first expansion valve
To the evaporator is discharged into after the carbon dioxide coolant throttling through being dried, the gas-liquid separator is to through the evaporator
Carbon dioxide coolant gas-liquid separation, primary compressor sucking is described through gas-liquid separator treated carbon dioxide system
Cryogen；First water-cooling system and the intercooler heat exchange absorb heat, and the cooling water in first water-cooling system is inhaled
The water tank is discharged into after heat, second water-cooling system recycles cooling water and the first heat exchanger in the water tank
Heat exchange；The valve group is arranged in the pipeline of the system for adjusting flow, the carbon dioxide coolant of the cooling water
Flow and carbon dioxide coolant pressure；First temperature sensor is for obtaining the carbon dioxide system through intercooler
The temperature T1 of cryogen, the first pressure sensor are used to obtain the pressure P1 of the carbon dioxide coolant through intercooler,
Control the temperature T1 and the carbon dioxide refrigeration through intercooler of the carbon dioxide coolant through intercooler
The corresponding carbon dioxide coolant saturation temperature T of the pressure P1 of agentP1Meet preset condition.
This method obtains the titanium dioxide through intercooler by the way that the first temperature sensor is arranged in Two-stage refrigerating system
The temperature T1 of carbon refrigerant, setting first pressure sensor obtain the pressure P1 of the carbon dioxide coolant through intercooler,
Control the temperature T1 and the carbon dioxide refrigeration through intercooler of the carbon dioxide coolant through intercooler
The corresponding carbon dioxide coolant saturation temperature T of the pressure P1 of agentP1Meet preset condition guarantee, is controlled according to temperature T1 and pressure P1
The valve group set in systems is set up, the flow for passing through the water water shortage of intercooler meets specified conditions, guarantees to be inhaled into
The refrigerator of split-compressor is in suitable temperature.Allow split-compressor that can play efficient compression.To improve dual stage
Cooling system can efficiently realize that carbon dioxide coolant work in Trans-critical cycle working range, improves the refrigerating capacity of system.
Detailed description of the invention
Fig. 1 is Two-stage refrigerating system of embodiment of the present invention figure
Fig. 2 is Two-stage refrigerating system of embodiment of the present invention primary compressor delivery temperature control flow chart
Fig. 3 is that Two-stage refrigerating system of embodiment of the present invention split-compressor delivery temperature and the control of secondary cooling coolant-temperature gage are flowed
Cheng Tu
Fig. 4 is Two-stage refrigerating system of embodiment of the present invention subcooler temperature control flow figure
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Embodiment 1:
Technical solution of the present invention is schematically illustrated below by Fig. 1, according to the present invention Two-stage refrigerating system, is wrapped
Include carbon dioxide coolant, primary compressor A, intercooler D, split-compressor A, first heat exchanger E, post-processing system
System, the first expansion valve 2, evaporator J, gas-liquid separator K, valve group, water tank F, the first water-cooling system and the second water-cooling system, institute
It states primary compressor A and sucks the carbon dioxide coolant progress primary compression, the intercooler D is to the two of primary compression
Carbonoxide refrigerant is cooling, and the split-compressor B sucking carries out second level through intercooler D cooling carbon dioxide coolant
The carbon dioxide coolant of two-stage compression, the carbon dioxide refrigeration of the cooling two-stage compression of the first heat exchanger E is discharged in compression
After be discharged into the after-treatment system, the after-treatment system is to passing through first heat exchanger E carbon dioxide coolant after cooling
It is dried, 2 pairs of first expansion valve is discharged into the steaming after the carbon dioxide coolant reducing pressure by regulating flow through being dried
Device J is sent out, the gas-liquid separator K inhales the carbon dioxide coolant gas-liquid separation through the evaporator, the primary compressor A
Enter described through gas-liquid separator K treated carbon dioxide coolant；First water-cooling system and intercooler D heat
Exchange absorbs heat, is discharged into the water tank F after the cooling water heat absorption in first water-cooling system, second water-cooling system is followed
Ring is exchanged heat using the cooling water in the water tank with the first heat exchanger E；The pipe of the system is arranged in the valve group
For adjusting the flow of the cooling water and carbon dioxide coolant or the pressure of carbon dioxide coolant in road.
Valve group in the system includes electric expansion valve and solenoid valve, and electric expansion valve is for the dioxy in regulating system
Change the pressure of carbon refrigerant, solenoid valve is used for the flow of regulation of carbon dioxide refrigerant and cooling water.Example as the present embodiment
One of son, intercooler can be with water-cooled heat exchangers, and cooling media are low-temperature water source, the low-temperature water source can be tap water or
Other water sources that can be utilized of person, low-temperature water source is merely possible to a relative concept in the present embodiment, as long as being lower than
It the water source of the delivery temperature of primary compressor all can be this system utilization.The present embodiment is only the citing to low-temperature water source, and
It is not exhaustion, can be other liquid for a specific purpose.
The cooling water of the low-temperature water source flows through intercooler D, from the compressed carbon dioxide coolant of primary compressor A
Heat exchange heat absorption occurs with low-temperature cooling water in intercooler D, the carbon dioxide coolant after primary compression is cooled to
Suitable temperature range, one of the citing as present embodiment, the temperature can containing according to carbon dioxide coolant (CO2)
Oil mass or degree of purity determine, the temperature of split-compressor Efficient Compression can be played when for two-stage compression.
After can making primary compression by flowing through the cooling water flow of intercooler D as one of alternative embodiment
Carbon dioxide becomes saturated gas state.
For being cooled down by the high temperature and pressure carbon dioxide coolant of two-stage compression using first heat exchanger E,
First Heat Exchanger E is referred to as air cooler or gas cooler in system, but this is only an appellation, as long as can be realized pair
The refrigerant of two-stage compression cools down.Such as first heat exchanger E can be water-cooled heat exchanger in the present system, absorb
The cooling water of primary compressor A exhaust gas heat is stored in water tank F, which can be re-used for split-compressor
Exhaust cools down, and second level cooling means that the cooling water absorbs heat again, can become the higher spare water of temperature.It can
Cooling water is allowed to flow through intercooler D and First Heat Exchanger E from low-temperature water source to be understood that, it can be in the first water cooling or
Water pump is set in two water-cooling systems, for providing driving force for the flowing of cooling water.The first water-cooling system refers to pair in the present embodiment
Primary compression discharge refrigerant carries out cooling system, and the second water-cooling system refers to that the discharge refrigerant progress to two-stage compression is cold
But cooling system.Second water-cooling system draws cooling water from water tank and exchanges heat with first heat exchanger, absorbs second level pressure
The cooling of contracting machine exhaust gas heat can recycle stream such as water tank again, provide power for the flowing of the second water-cooling system cooling water
Either water pump is also possible to provide mobilization dynamic by the principle of position Selection utilization gravity, in the present embodiment simultaneously
It is not specifically limited.
Schematically illustrate the system after split-compressor in conjunction with attached drawing 1 further below, split-compressor discharge
CO2 refrigerant is introduced into drier I after first heat exchanger E cooling by system pipeline, the liquid in refrigerant of going out
Dry refrigerant is introduced into electric expansion valve 101 carries out reducing pressure by regulating flow, above-mentioned electric expansion valve to refrigerant thereafter by ingredient
101 be the device that throttling may be implemented in other.Refrigerant after throttling is introduced into evaporator J, absorbs heat and phase conversion occurs,
So that the environment temperature where evaporator J reduces and realizes refrigeration effect.Air-cooled side can choose for the heat exchange of evaporator J
Other types of cooling equally also can be used in formula.Gas-liquid separator of the refrigerant through entering in system after evaporator is to refrigeration
The phase of agent carries out screening separation, and gaseous refrigerant sucking primary compressor is recycled, and realizes that has completely been worth a system
Cooling system system.
Using fundamental system described in above scheme, by the first water-cooling system and the second water-cooling system respectively to primary
The delivery temperature of compressor and the exhaust of split-compressor are adjusted, and CO2 refrigerant can be made to be inhaled into second level after primary compression
Saturation state is kept when compression, is conducive to reduce thermodynamic losses, is improved system working efficiency.Two water-cooling systems are in appropriate position
Setting on the one hand reduce thermodynamic losses, another star's heat rationally utilizes, improve heat utilization ratio.
As one of the scene of this system application, the heat (hot water) that above-mentioned water-cooling system generates can be bath system benefit
With, and the hot water of offer constant temperature that can be stable is provided to this system.
Still be illustrated as follows in conjunction with other improvements of the attached drawing 1 to this system, as above embodiment improvement it
One, it is arranged in after-treatment system namely in the down-stream system through first heat exchanger E split-compressor B exhaust outlet after cooling
One branch, the branch are the first branch, the refrigerant after cooling two-stage compression are shunted a part, and guide to second level pressure
The air entry upstream of contracting machine B is mixed with through intercooler D primary compression refrigerant after cooling, and mixed refrigerant is inhaled
Enter split-compressor and participates in system circulation.Patent can be set to mix above-mentioned two refrigerant for mixed chamber,
It can only be mixed by pipeline, mixing chamber is arranged certainly preferably to be mixed refrigerant, the hybrid system
Do not illustrate in fig. 1.
It is changed to one of the improvement to this system, in order to which the refrigerant and primary compressor A of the circulation in second branch are discharged
And the refrigerant pressure through intercooler D quite can carry out pressure adjusting so that electronic expansion big 102 to be arranged in second branch.
It is changed to another improvement to this system, for the first and second water-cooling systems, in order to regulate and control to flow through their cooling
The first solenoid valve 11 is arranged in the flow of water on the pipeline of the first water-cooling system, flows through it by the way that electromagnetic valve for adjusting is adjustable
Cooling water flow, and then control the heat exchanger effectiveness of intercooler D, thus the delivery temperature of primary compressor A can also be with
It is controlled.Second solenoid valve 12, the solenoid valve can also be arranged between low-temperature water source and water tank F to the improvement of system simultaneously
Requiring supplementation with water in water tank is that the water of cooling water source can be introduced directly into water tank with opening tool, this not only can be with subsidiary water tank F
Water, also maintenance water tank F cooling water in suitable temperature.It is preferred that the power of low-temperature water source to water tank moisturizing can
To be provided by water pump C.
The improvement of the present embodiment is also embodied in the setting solenoid valve 22 in second branch, flows through second branch for controlling
Refrigerant flow electromagnetism can be set on the pipeline before the first branch and second branch shunt in after-treatment system
Valve 21 can be by the system of system by this system Zhong Fa group for controlling the refrigerant flow for flowing through entire after-treatment system
The optimal state that cryogen is adjusted.
In order to guarantee system cooling capacity, the present embodiment may further increase by the second heat exchanger H, second heat exchanger
Sometimes referred to as subcooler, for being cooled down to the refrigerant in the first branch and second branch, it is ensured that made in the first branch
Refrigerant in cryogen supercooling and second branch reaches saturation state.
It will describe as follows in conjunction with attached drawing 2 to above-mentioned fundamental system or to the controlling party of the improved system of fundamental system
Method, to realize positive effect to this system using the control method of present embodiment.Above-mentioned implementation method by
Step completely introduces system, and method control as follows is that the control that can be for fundamental system is also possible to for improvement
The control of system afterwards, until then which kind of control those skilled in the art is understanding that above system this part introduces the base of control method
It can be combined on plinth.According to control method need that setting unit perception device can be needed according to control and system,
Specifically if being applicable to the control to system after improvement to the control method of fundamental system.
Present embodiment control method as shown in Figure 2, in above system (in order to save space not in the repeated description system
And its a series of improvement) the exit intercooler D be provided with the first temperature sensor and first pressure sensor, described
One temperature sensor is used to obtain the temperature T1 of the carbon dioxide coolant through intercooler, and the first pressure sensor is used for
The pressure P1 of the carbon dioxide coolant through intercooler is obtained, the carbon dioxide coolant through intercooler is controlled
Temperature T1 corresponding with the pressure P1 of the carbon dioxide coolant through intercooler carbon dioxide coolant saturation temperature
Degree TP1 meets preset condition.The preset condition is that T1-TP1=△ T, △ T level off to 0.By adjusting electromagnetism in this programme
Valve 11 may be implemented, while can also also be may be implemented by adjusting the solenoid valve 22 in second branch in improved system,
It can also be jointly controlling for solenoid valve 11 and solenoid valve 22.
As another side of the control method of this system, as shown in figure 3, in the exhaust outlet of split-compressor B and first
Second temperature sensor and second pressure sensor are set between the inlet port of heat exchanger E, for detecting split-compressor B's
Delivery temperature T2 and pressure P2.Third temperature sensor is set between water tank F and the water inlet of first heat exchanger E, is used for
Detection flows into the temperature T3 of the cooling water of first heat exchanger E, on the basis of above-mentioned control method, controls split-compressor B
Delivery temperature T2 and flow into the temperature T3 of cooling water of first heat exchanger E and meet the second preset relation, as specific control
Second preset relation can be set as T2-T3 >=30 DEG C, guarantee the heat exchange efficiency of first heat exchanger with this.Control can be passed through
Solenoid valve 12 processed supplements the chilled water modulation cooling water flow of low-temperature water source, and then adjusts the temperature difference and the relationship is maintained to meet setting.
The improved method can be implemented based on above-mentioned control method, can also individually implement the control within the system.
Further, the first branch and equipped with second heat exchanger H improvement system in, go out in second heat exchanger H
It is provided with the 4th temperature sensor and the 4th pressure sensor between mouth and drier I entrance, for detecting second heat exchanger
The refrigerant temperature T4 and pressure P4 in exit.As shown in figure 4, control temperature T4 and pressure P4 meets third preset condition, it should
Third preset condition is TP4- T4 >=5 DEG C (TP4 is the corresponding lower saturation temperature of P4).The improved method can be based on above-mentioned control method
Implement, can also individually implement the control within the system.
In the improvement system for being equipped with second branch, solenoid valve 22 is set in second branch, by controlling solenoid valve 22
The carbon dioxide coolant flow for flowing through it is adjusted, passes through its carbon dioxide coolant and after the intercooler
Carbon dioxide coolant saturation temperature it is identical.The improved method can be implemented based on above-mentioned control method, can also be at this
Individually implement the control in system.
In the Two-stage refrigerating system of above scheme, side is provided as the cold source of refrigeration system in evaporator J, is refrigerating ring
Border provides cooling capacity, is provided with the system for drying to the evaporator J in practical applications, the heat of evaporitic environment is passed through
Evaporator J takes away, and manufactures cooling capacity to place environment, forms the environment of a freezing.The temperature-controllable for wherein flowing through evaporator,
The air inlet of evaporator is provided with the 6th temperature sensor for detecting environment temperature T6, is arranged on the coil pipe of the evaporator
5th sensor meets specified conditions for detecting evaporator coil temperature, control temperature T6 and T5, the specific preferably satisfaction
T6-T5≥15℃。
The carbon dioxide refrigeration that the second level control method of refrigeration of present embodiment passes through control primary compressor discharge
The relationship of temperature of the agent after intercooler saturation temperature corresponding with pressure and pressure, the sucking of split-compressor dioxy
After the temperature and pressure of change carbon refrigerant, the delivery temperature of split-compressor and secondary cycle cooling water temperature relationship, subcooler
The temperature of carbon dioxide coolant and the combination of the relationships such as pressure or above-mentioned relation realize second level refrigeration system high efficient and reliable
Operation.
Above-mentioned control method reads the control of realization system for work controller there may be on a storage medium.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, Lai Zhihang function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system, including the system of processor or other can be held from instruction
The instruction fetch of row system, device or equipment and the system executed instruction) it uses, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium ", which can be, any may include, stores, communicates, propagates or pass
Defeated program is for instruction execution system, device or equipment or the dress used in conjunction with these instruction execution systems, device or equipment
It sets.The more specific example (non-exhaustive list) of computer-readable medium include the following: there is the electricity of one or more wirings
Interconnecting piece (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only memory
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable
Medium, because can then be edited, be interpreted or when necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.In addition, in each embodiment of the present invention
In each functional unit can integrate in a processing module, be also possible to each unit and physically exist alone, can also two
A or more than two units are integrated in a module.Above-mentioned integrated module both can take the form of hardware realization, can also
It is realized in the form of using software function module.If the integrated module realized in the form of software function module and as
Independent product when selling or using, also can store in a computer readable storage medium.Storage mentioned above
Medium can be read-only memory, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention by appended claims and its equally limit that the above description is only a preferred embodiment of the present invention and
, it is not intended to restrict the invention, for those skilled in the art, the invention may be variously modified and varied.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in guarantor of the invention
Within the scope of shield.
Claims (15)
1. a kind of Two-stage refrigerating system, including carbon dioxide coolant, primary compressor, intercooler, split-compressor,
One heat exchanger, after-treatment system, the first expansion valve, evaporator, gas-liquid separator, valve group, water tank, the first water-cooling system and
Second water-cooling system, it is characterised in that: the primary compressor sucks the carbon dioxide coolant and carries out primary compression, described
Intercooler is cooling to the carbon dioxide coolant of primary compression, and the split-compressor sucking is through intercooler cooling
Carbon dioxide coolant carries out two-stage compression, and the carbon dioxide coolant of two-stage compression is discharged, and the first heat exchanger is cooling
The after-treatment system is discharged into after the carbon dioxide refrigeration of two-stage compression, the after-treatment system is to cold by first heat exchanger
But the carbon dioxide coolant after is dried, and first expansion valve is to the carbon dioxide coolant section through being dried
Be discharged into the evaporator after stream decompression, the gas-liquid separator to the carbon dioxide coolant gas-liquid separation through the evaporator,
Primary compressor sucking is described through gas-liquid separator treated carbon dioxide coolant；First water-cooling system and institute
It states intercooler heat exchange and absorbs heat, be discharged into the water tank after the cooling water heat absorption in first water-cooling system, it is described
Second water-cooling system recycles cooling water and first heat exchanger heat exchange in the water tank；The valve group setting exists
For adjusting the flow of the cooling water, the flow of carbon dioxide coolant and carbon dioxide coolant in the pipeline of the system
Pressure.
2. refrigeration system according to claim 1, it is characterised in that: the after-treatment system include the first refrigerant branch and
Second refrigerant branch, the first refrigerant branch are used to carbon dioxide coolant introducing the expansion valve, second refrigerant
Branch road is provided with the second expansion valve for throttling to the carbon dioxide coolant for flowing through it, through second expansion valve
Split-compressor is inhaled into after the carbon dioxide coolant cold mixing of the carbon dioxide coolant of throttling and the primary compression.
3. refrigeration system according to claim 1, it is characterised in that: change exchanger, second heat exchange including second
Device cools down the carbon dioxide coolant for flowing through the first branch and the second branch.
4. refrigeration system according to claim 2, it is characterised in that: the valve group includes first flow regulating valve, institute
First flow regulating valve is stated to be arranged in the second branch for adjusting the stream for the carbon dioxide coolant for flowing through second branch
Amount.
5. refrigeration system according to claim 1, it is characterised in that: the valve group includes second flow regulating valve, institute
Second flow regulating valve is stated for adjusting the cooling water flow in first water-cooling system.
6. refrigeration system according to claim 5, it is characterised in that: including cooling water source, the valve group includes third
Flow control valve, the third flow control valve are used to adjust the flow for the cooling water that cooling water source is supplemented to the water tank.
7. a kind of control method of Two-stage refrigerating system, the Two-stage refrigerating system includes carbon dioxide coolant, primary compression
Machine, intercooler, split-compressor, first heat exchanger, after-treatment system, the first expansion valve, evaporator, gas-liquid separation
Device, valve group, water tank, the first water-cooling system, the second water-cooling system and the first temperature sensor and first pressure sensor, it is special
Sign is: the primary compressor sucks the carbon dioxide coolant and carries out primary compression, and the intercooler is to primary
The split-compressor is discharged into after the carbon dioxide coolant of compression is cooling, the split-compressor sucking is dropped through intercooler
The carbon dioxide coolant of the primary compression of temperature carries out two-stage compression, is discharged the carbon dioxide coolant of two-stage compression, and described the
It is discharged into the after-treatment system after the carbon dioxide refrigeration of the cooling two-stage compression of one heat exchanger, the after-treatment system is to process
First heat exchanger carbon dioxide coolant after cooling is dried, and first expansion valve is to two through being dried
It is discharged into the evaporator after the throttling of carbonoxide refrigerant, the gas-liquid separator is to the carbon dioxide coolant through the evaporator
Gas-liquid separation, primary compressor sucking are described through gas-liquid separator treated carbon dioxide coolant；First water
Cooling system and the intercooler heat exchange absorb heat, are discharged into the water after the cooling water heat absorption in first water-cooling system
Case, second water-cooling system recycle cooling water and first heat exchanger heat exchange in the water tank；The valve group
Group is arranged in the pipeline of the system for adjusting the flow of the cooling water, the flow of carbon dioxide coolant and titanium dioxide
The pressure of carbon refrigerant；First temperature sensor is used to obtain the temperature T1 of the carbon dioxide coolant through intercooler,
The first pressure sensor is used to obtain the pressure P1 of the carbon dioxide coolant through intercooler, controls described through centre
The temperature T1 of the carbon dioxide coolant of cooler is corresponding with the pressure P1 of the carbon dioxide coolant through intercooler
Carbon dioxide coolant saturation temperature TP1Meet preset condition.
8. the control method of refrigeration system according to claim 7, it is characterised in that: the valve group includes second flow tune
Valve is saved, the second flow regulating valve is used to adjust cooling water flow in first water-cooling system, by adjusting described the
Cooling water flow in one water-cooling system controls the temperature T1 of the carbon dioxide coolant through intercooler and through centre
The corresponding carbon dioxide coolant saturation temperature T of the pressure P1 of the carbon dioxide coolant of coolerP1Meet the first preset condition.
9. the control method of refrigeration system according to claim 9, it is characterised in that: first preset condition is T1-TP1
=△ T, △ T level off to 0.
10. the control method of refrigeration system according to claim 7, it is characterised in that: the refrigeration system includes the second temperature
Degree and third temperature sensor, the second temperature sensor is used to obtain the delivery temperature T2 of the split-compressor, described
The cooling water that third temperature sensor is used to obtain second water-cooling system enters the cooling water before the first heat exchanger
Temperature T3, the cooling water of the delivery temperature T2 and second water-cooling system that control the split-compressor enter first heat
Temperature T3 before exchanger meets the second preset condition.
11. the control method of refrigeration system according to claim 10, it is characterised in that: the second preset condition of institute is T2-T3≥
30℃。
12. the control method of refrigeration system according to claim 7, it is characterised in that: the after-treatment system includes first
Refrigerant branch, the second refrigerant branch and second heat exchanger, the first refrigerant branch is for introducing carbon dioxide coolant
The expansion valve, the second refrigerant branch road are provided with second for throttling to the carbon dioxide coolant for flowing through it
The carbon dioxide coolant of expansion valve, carbon dioxide coolant and the primary compression through second expansion valve throttling is cold mixed
Split-compressor is inhaled into after conjunction；The two heat exchangers are to the carbon dioxide for flowing through the first branch and the second branch
Refrigerant is cooled down；4th temperature sensor and the 4th pressure sensor, the 4th temperature sensor setting is described the
One road is used to obtain the temperature T4 of the carbon dioxide coolant after second heat exchanger, and the 4th pressure sensor is set
It sets in the first branch for obtaining the pressure P4 of the carbon dioxide coolant after second heat exchanger, controls the pressure
The corresponding carbon dioxide coolant saturation temperature T of power P4P4Meet third preset condition with the temperature T4.
13. the control method of refrigeration system according to claim 12, it is characterised in that: TP4-T4≥5℃。
14. the control method of refrigeration system according to claim 12, it is characterised in that: the valve group includes the 4th flow
Regulating valve, the 4th flow control valve are arranged in the second branch, and the carbon dioxide of second branch is flowed through by controlling
The flow of refrigerant makes identical as the saturation temperature of the carbon dioxide coolant after the intercooler.
15. the control method of refrigeration system according to claim 7, it is characterised in that: including cooling water source, the valve group
Group includes third flow control valve, controls the third flow control valve and adjusts the cooling water that cooling water source is supplemented to the water tank
Flow.
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| CN201811339278.6A CN109442786A (en) | 2018-11-12 | 2018-11-12 | A kind of control method of Two-stage refrigerating system and Two-stage refrigerating system |
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| CN201811339278.6A CN109442786A (en) | 2018-11-12 | 2018-11-12 | A kind of control method of Two-stage refrigerating system and Two-stage refrigerating system |
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| CN110701057A (en) * | 2019-09-12 | 2020-01-17 | 珠海格力电器股份有限公司 | Dual-system screw machine anti-beat vibration noise control method, computer readable storage medium and system |
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