CN106924988B - A kind of rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery - Google Patents
A kind of rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery Download PDFInfo
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- CN106924988B CN106924988B CN201710056483.0A CN201710056483A CN106924988B CN 106924988 B CN106924988 B CN 106924988B CN 201710056483 A CN201710056483 A CN 201710056483A CN 106924988 B CN106924988 B CN 106924988B
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- 238000000926 separation method Methods 0.000 title claims abstract description 53
- 238000011084 recovery Methods 0.000 title claims abstract description 25
- 239000003507 refrigerant Substances 0.000 claims abstract description 165
- 238000009833 condensation Methods 0.000 claims abstract description 39
- 230000005494 condensation Effects 0.000 claims abstract description 39
- 238000001816 cooling Methods 0.000 claims abstract description 39
- 239000007789 gas Substances 0.000 claims description 164
- 230000008676 import Effects 0.000 claims description 159
- 239000000203 mixture Substances 0.000 claims description 64
- 238000010992 reflux Methods 0.000 claims description 34
- 239000012530 fluid Substances 0.000 claims description 28
- 239000007791 liquid phase Substances 0.000 claims description 22
- 239000007792 gaseous phase Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 239000012071 phase Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000011176 pooling Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 166
- 239000007788 liquid Substances 0.000 abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000000341 volatile oil Substances 0.000 abstract description 2
- 230000006837 decompression Effects 0.000 abstract 1
- 238000006467 substitution reaction Methods 0.000 abstract 1
- 238000009835 boiling Methods 0.000 description 32
- 238000000034 method Methods 0.000 description 17
- 238000005057 refrigeration Methods 0.000 description 13
- 229930195733 hydrocarbon Natural products 0.000 description 12
- 150000002430 hydrocarbons Chemical class 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- 238000004821 distillation Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 4
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N hexane Substances CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- 238000010257 thawing Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000001282 iso-butane Substances 0.000 description 2
- 235000013847 iso-butane Nutrition 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N sec-butylidene Natural products CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 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
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004508 fractional distillation Methods 0.000 description 1
- 230000002631 hypothermal effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/0087—Recirculating of the cooling medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0051—Regulation processes; Control systems, e.g. valves
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery that the invention discloses a kind of, including compressor, condenser, rectifier unit and oil gas condensation separation and cold recovery circuit；Oil gas condensation separation and cold recovery circuit include First Heat Exchanger unit, the second heat exchanger unit, third heat exchanger unit, first throttle element and separator unit；The present invention utilizes the multi-stage separation process in rectifier unit substitution conventional hybrid working medium auto-cascade oil and gas separating system, draw the high pressure liquid refrigerant of heterogeneity respectively from rectifier unit bottom and top simultaneously, the decompression respectively that is condensed after oil pre-cooling enters water equivalent variation in the temperature-fall period of Optimized Matching heterogeneity oil gas in First Heat Exchanger unit, have many advantages, such as that structure is simple, reliable for operation and energy saving, is particularly suitable for the processing of the volatile oil and gas in places such as oil depot, gas station, petrochemical industry processing.
Description
Technical field
The present invention relates to Oil-gas Separation technical field more particularly to a kind of rectification type Auto-cascade cycle low temperature colds with cold recovery
Solidifying oil and gas separating system.
Background technique
Contain a large amount of volatile light hydrocarbon components in some oil products stored in the places such as oil depot, gas station, petrochemical industry processing,
It easily volatilizees and is mixed in air in storage and transport process, cause oil loss, environmental pollution and security risk.It is therefore necessary to
Oil laden air in these places is handled.National standard GB20950-2007 " storage tank farm atmosphere pollutants emission standards " and
In the specification such as GB20952-2007 " gas station's atmosphere pollutants emission standards ", non-methane in the oil gas of equal clear stipulaties discharge
Total hydrocarbon content should be not more than 25g/cm3。
In Oil-gas Separation field, condensation method is suitable for the steaming of higher concentration hydrocarbon since it may separate out purer product
The separation and recovery of vapour, is concerned by people.Initial people generally use cascade refrigeration circulation and condense in air to cool down step by step
Oil gas, that is, use different refrigerants to operate in the hydrocarbon for obtaining different temperature levels in multiple refrigeration cycle to condense different boiling
Component.But equipment needed for cascade refrigeration system is more, is gradually mixed chiller refrigeration circulation and substitutes.In general, mixing system
The thought of self-cascade refrigeration system is used in cryogen oil and gas separating system, has multi-stage gas-liquid to separate in the circulation of refrigerant
Journey, so that high low-boiling refrigerant separation is more complete；General middle-size and small-size system will use commonly because of cost consideration simultaneously
Oil lubricating compressor, the lubricating oil that multi-stage separation can take refrigerant out of condenses out, it is avoided to enter low-temperature zone blocking section
Flow device.But increasing the system of will lead to structure is complicated and changing for grade is separated, off design performance is deteriorated.Especially for it is small-sized,
The oil and gas separating system of miniature scale, structure are simply extremely important.
In current gas and oil separating plant patent, shorter mention is further processed to condensed oil, usually will be cold
Solidifying oil directly collects, and wastes the cooling capacity in the cold oil of different temperatures position.
Notification number is that the Chinese patent literature of CN102141317A discloses a kind of rectification-type self-overlaying gas liquefying system,
Including compressor, condenser, rectifier unit and unstripped gas liquefaction circuits；Compressor discharge port is connected with condenser feed inlet,
The discharge port of condenser is connected with rectifier unit kettle middle charging aperture, rectifier unit include rectifying column and with rectifying column rectifying section top
The tower top heat exchanger of portion's connection, the discharge port at the top of tower top heat exchanger are connected with unstripped gas liquefaction circuits, and unstripped gas is across raw material
Gas liquefaction circuit obtains final liquiefied product.
The invention using rectifier unit replace conventional hybrid Working medium gas liquefaction system multi-stage separation process, and using from
The highly pressurised liquid for the heterogeneity that rectifier unit bottom and top are drawn depressurizes respectively to be entered in unstripped gas liquefaction circuits, optimization
It is simple, reliable for operation and be with structure to cool down unstripped gas paragraph by paragraph with the water equivalent variation in unstripped gas cooling liquefaction process
The advantages that liquefaction efficiency of uniting is high, especially suitable for various small-sized and minitype gas liquefaction system.However, the device scope of application has
Limit is only applicable to need by the whole liquefied occasion of unstripped gas.And in the occasion of processing oil laden air, it is only necessary to which oil to the greatest extent may be used
Energy condensation liquefaction gets off, and air is not liquefied, so the device is not suitable for Oil-gas Separation field.Meanwhile through condensing
Different hypothermia position oil and except in the Cryogenic air deoiled contain a large amount of cooling capacity, be worth making full use of.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of rectification type Auto-cascade cycle low temperature cold with cold recovery
Solidifying oil and gas separating system, which merges into a distillation process for the multi-stage separation process in refrigerant circulation, reliable for operation,
The hydrocarbon component in separation tail gas can be completed with a set of common oil lubricating compressor, emissions concentration is made to meet national standard,
It is particularly suitable for the processing of the volatile oil and gas in places such as oil depot, gas station.
Technical scheme is as follows:
A kind of rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery, including compressor, condenser, essence
Distillation unit and oil gas condensation separation and cold recovery circuit；The compressor outlet is connected with condenser inlet；Described
Condensator outlet is connected with rectifier unit import；The rectifier unit include rectifying column and with the column that is connected at the top of rectifying column
Heat exchanger is pushed up, capital heat exchanger top exit is separated with oil gas condensation and cold recovery circuit is connected, the oil gas condensation point
From and cold recovery circuit include First Heat Exchanger unit, the second heat exchanger unit, third heat exchanger unit, first throttle element
(16) and separator unit；The First Heat Exchanger unit includes that First Heat Exchanger (4), the second heat exchanger (5) and third are changed
The combination of one of hot device (6) or a few persons；Second heat exchanger unit includes evaporator (7)；The third heat exchange
Device unit includes one in the 4th heat exchanger (12), the 5th heat exchanger (13), the 6th heat exchanger (14) and the 7th heat exchanger (15)
The combination of person or a few persons；First throttle element (16) is set between First Heat Exchanger unit and the second heat exchanger unit；Separation
Device unit includes one of the first separator (8), the second separator (9), third separator (10) and the 4th separator (11)
Or the combination of several persons；
A positive stream refrigerant tubing, a refrigeration of backflowing are equipped in each heat exchanger of the First Heat Exchanger unit
Agent pipeline, an oil-gas pipeline and an exhaust pipe；A low pressure refrigerant pipeline and one are equipped in the evaporator
Oil-gas pipeline；Cooling pipe is equipped in the capital heat exchanger of the rectifier unit；The third heat exchanger unit respectively changes
Kettle base solution pipeline, reflux pipeline and multiple condensation oil-pipings are equipped in hot device；Specifically, there are four being set in the 4th heat exchanger
Oil-piping is condensed, is set in the 5th heat exchanger there are three oil-piping is condensed, is set in the 6th heat exchanger there are two condensing oil-piping, the 7th
A condensation oil-piping is equipped in heat exchanger；First separator, the second separator, third separator and the 4th separator
It is equipped with gaseous phase outlet and liquid-phase outlet；
The positive stream refrigerant tubing import of capital heat exchanger top exit with the First Heat Exchanger is connected；Described first
The positive stream refrigerant tubing outlet of heat exchanger is connected with the positive stream refrigerant tubing import of the second heat exchanger；Second heat exchanger
Positive stream refrigerant tubing outlet be connected with the positive stream refrigerant tubing import of third heat exchanger；The first throttling device into
Mouth is connected with the outlet of the positive stream refrigerant tubing of third heat exchanger, and outlet is connected with the low pressure refrigerant conduit entrance of evaporator；
The low pressure refrigerant pipe outlet of the evaporator is connected with the refrigerant tubing import of backflowing of third heat exchanger；The third is changed
The refrigerant tubing outlet of backflowing of hot device is connected with the refrigerant tubing import of backflowing of the second heat exchanger；Second heat exchanger
The refrigerant tubing that backflows outlet is connected with the refrigerant tubing import of backflowing of First Heat Exchanger；The system of backflowing of the First Heat Exchanger
Cryogen pipe outlet is connected with the import in the capital heat exchanger cooling pipe road of rectifier unit；Capital heat exchanger cooling pipe road
Outlet is connected with the air entry of compressor；
The outlet at bottom of the rectifier unit is connected with the kettle base solution conduit entrance of the 4th heat exchanger；4th heat exchanger
Kettle base solution pipe outlet be connected with the kettle base solution conduit entrance of the 5th heat exchanger；The kettle base solution pipeline of 5th heat exchanger goes out
Mouth is connected with the kettle base solution conduit entrance of the 6th heat exchanger；The kettle base solution pipe outlet and the 7th heat exchanger of 6th heat exchanger
Kettle base solution conduit entrance be connected；
The outlet at bottom of the capital heat exchanger of the rectifier unit is connected with the reflux pipeline import of the 4th heat exchanger；
The reflux pipeline outlet of 4th heat exchanger is connected with the reflux pipeline import of the 5th heat exchanger；5th heat exchanger
Reflux pipeline outlet be connected with the reflux pipeline import of the 6th heat exchanger；The reflux pipeline of 6th heat exchanger goes out
Mouth is connected with the reflux pipeline import of the 7th heat exchanger；
Kettle base solution pipe outlet and the reflux pipeline outlet of 7th heat exchanger pass through three articles of bypass line difference
It is connected with the import of the refrigerant tubing that backflows of First Heat Exchanger, the second heat exchanger, third heat exchanger；In the bypass line
It is equipped with a restricting element；
The connection type of the refrigerant tubing that backflows of each heat exchanger is to realize and make in positive stream refrigerant tubing
The cooling of cryogen and oil gas to be processed；First Heat Exchanger backflow refrigerant tubing outlet and the cooling pipe of capital heat exchanger into
Mouth is connected, and the cooling pipe outlet of capital heat exchanger is connected with compressor air suction mouth, to realize the circularly cooling of refrigerant.
In the oil gas condensation and cold recovery circuit, oil gas initially enter the oil-gas pipeline of First Heat Exchanger into
Mouthful, the oil-gas pipeline outlet of First Heat Exchanger is connected with the import of the first separator；By the gas-liquid separation of the first separator
Journey, the gaseous phase outlet of the first separator are connected with the oil-gas pipeline import of the second heat exchanger；The Oil/Gas Pipe of second heat exchanger is said
Mouth is connected with the import of the second separator；By the gas-liquid separation process of the second separator, the gaseous phase outlet of the second separator with
The oil-gas pipeline import of third heat exchanger is connected；The oil-gas pipeline outlet of third heat exchanger is connected with the import of third separator；
By the gas-liquid separation process of third separator, the gaseous phase outlet of third separator is connected with the oil-gas pipeline import of evaporator；
The oil-gas pipeline outlet of evaporator is connected with the import of the 4th separator；By the gas-liquid separation process of the 4th separator, gas phase
Part is the low temperature exhaust gas for meeting concentration of emission requirement.The low temperature exhaust gas enters third through the gaseous phase outlet of the 4th separator and changes
The exhaust pipe import of hot device, the outlet of third heat exchanger exhaust pipe are connected with the exhaust pipe import of the second heat exchanger；Second
The outlet of heat exchanger exhaust pipe is connected with the exhaust pipe import of First Heat Exchanger, and final tail gas is through First Heat Exchanger exhaust pipe
Outlet drain；By liquid-phase outlet, second separator of the cold oil liquid through the first separator for gradually condensing and separating
Liquid-phase outlet, the liquid-phase outlet of third separator, the 4th separator liquid-phase outlet discharge.
It is cold that the cold oil of the different temperatures of each separator discharge passes through the recycling of each heat exchanger in third heat exchanger unit
Amount, the heat exchanger that the lower cold oil of temperature passes through are more.
Specifically, the first separator liquid-phase outlet is connected with the first cold oil conduit entrance of the 4th heat exchanger, cold oil
It is discharged after the heating of the 4th heat exchanger from the No.1 cold oil pipe outlet of the 4th heat exchanger；
Second separator liquid-phase outlet is connected with the first cold oil conduit entrance of the 5th heat exchanger；The of 5th heat exchanger
One cold oil pipe outlet is connected with the second cold oil conduit entrance of the 4th heat exchanger, and cold oil is by the 5th heat exchanger and the
It is discharged after the heating of four heat exchangers from the second cold oil pipe outlet of the 4th heat exchanger；
Third separator liquid-phase outlet is connected with the first cold oil conduit entrance of the 6th heat exchanger；The of 6th heat exchanger
One cold oil pipe outlet is connected with the second cold oil conduit entrance of the 5th heat exchanger；Second condensation oil pipe of the 5th heat exchanger
Road outlet is connected with the third cold oil conduit entrance of the 4th heat exchanger, cold oil pass through the 6th heat exchanger, the 5th heat exchanger and
It is discharged after the heating of 4th heat exchanger from the third cold oil pipe outlet of the 4th heat exchanger；
4th separator liquid-phase outlet is connected with the first cold oil conduit entrance of the 7th heat exchanger；The of 7th heat exchanger
One cold oil pipe outlet is connected with the second cold oil conduit entrance of the 6th heat exchanger；Second condensation oil pipe of the 6th heat exchanger
Road outlet is connected with the third cold oil conduit entrance of the 5th heat exchanger；The third cold oil pipe outlet of 5th heat exchanger and
4th cold oil conduit entrance of four heat exchangers is connected, cold oil by the 7th heat exchanger, the 6th heat exchanger, the 5th heat exchanger and
It is discharged after the heating of 4th heat exchanger from the 4th cold oil pipe outlet of the 4th heat exchanger.
It can divide from the cold oil after the rewarming of the first, second, third, fourth cold oil pipe outlet of the 4th heat exchanger
It or after mixing is not recycled to storage tank, or is otherwise stored and is utilized.
In the present invention, First Heat Exchanger unit is not limited to be made of three heat exchangers, can adjust according to the actual situation
The number of heat exchanger in whole First Heat Exchanger unit；Similarly, third heat exchanger unit is also not limited to by four heat exchangers
It constitutes, the number of heat exchanger in third heat exchanger unit can be adjusted according to the sum of series actual conditions of Oil-gas Separation.With
The number of the adjustment of heat exchanger number in First Heat Exchanger unit, separator unit inner separator will adjust accordingly, third
The cold oil number of conduits of each heat exchanger should do corresponding adjustment, the kettle base solution pipe outlet of the 7th heat exchanger in heat exchanger unit
Also make to adjust accordingly with the number of the restricting element of the bypass line number and branch road of reflux pipeline outlet connection；
Oil gas to be treated is successively passed through the heat exchanger unit in oil gas condensation separation and cold recovery circuit by the present invention
It is interior, main cooling capacity is provided by the low pressure refrigerant to backflow, and according to oil gas composition characteristic to be processed, utilize rectifier unit
The high pressure refrigerant liquid of bottom and top heterogeneity mixes after throttling respectively with low pressure refrigerant, to optimize and match oil gas
Water equivalent variation in temperature-fall period, cools down oil gas paragraph by paragraph, reduce in different temperature zones heat exchanger mix refrigerant and oil gas it
Between heat transfer temperature difference, thus adapt to heterogeneity oil gas condensation separation and reduce system unit wasted work.It is cooled down step by step
Oil gas passes through multiple gas-liquid separation, ultimately forms the low temperature exhaust gas for meeting concentration of emission requirement, can provide again a part of cold
It measures, is discharged after rewarming；The cold oil liquid condensed under different temperatures is used to be pre-chilled the extraction of rectifier unit bottom and top
High pressure refrigerant liquid, is allowed to reduce after certain temperature throttle again and mixes with low pressure refrigerant, and the cooling capacity for realizing cold oil is returned
It receives, is more advantageous to the comprehensive utilization of energy.
To guarantee the stability of entire oil and gas separating system, while the comprehensive utilization of the energy is realized, in preferred technical side
In case, one or more devices for drying and filtering, realization pair can be set on the liquid outlet conduit of the rectifier unit bottom
The drying and filtering of bottom trickle；One or more bottom heat exchangers can also be set simultaneously, to the refrigeration of bottom outflow
After agent is pre-chilled, then its oil that is condensed is allowed further to be pre-chilled.
When the number of device for drying and filtering and bottom heat exchanger is one, the outlet at bottom of the rectifier unit is first
It is sequentially connected device for drying and filtering and bottom heat exchanger, then is connected with the kettle base solution conduit entrance of the 4th heat exchanger；The bottom
High-pressure refrigerant pipeline and low pressure refrigerant pipeline are equipped in heat exchanger；The device for drying and filtering import and rectifier unit bottom
Outlet is connected, and outlet is connected with the high-pressure refrigerant conduit entrance of bottom heat exchanger；The high-pressure refrigerant of the bottom heat exchanger
Pipe outlet is connected with the kettle base solution conduit entrance of the 4th heat exchanger；The low pressure refrigerant conduit entrance of the bottom heat exchanger with
The capital heat exchanger exit of rectifier unit is connected, and outlet is connected with compressor air suction mouth.Using low pressure refrigerant to rectifier unit
The liquid refrigerant of bottom is pre-chilled, and realizes the comprehensive utilization of energy；High-pressure refrigerant pipe in the bottom heat exchanger
The import of road and low pressure refrigerant pipeline is located at the two sides of the heat exchanger, to realize counterflow heat exchange.
If the higher or to be processed oil gas of water content is before condensation process without passing through it in oil gas to be processed
He is dried, and in another preferred technical solution, can will backflow by First Heat Exchanger unit still in -10 DEG C
~-20 DEG C of tail gas and the oil gas to be processed into before First Heat Exchanger unit carry out backheat in the 4th heat exchanger unit.
4th heat exchanger unit include the 8th heat exchanger, the 9th heat exchanger, the first shut-off valve, the second shut-off valve,
Third shut-off valve, the 4th shut-off valve, the 5th shut-off valve, the 6th shut-off valve, the 7th shut-off valve, the 8th shut-off valve；Described 8th changes
Hot device and the 9th heat exchanger are arranged in parallel；
There are an oil-gas pipeline and an exhaust pipe inside 8th heat exchanger and the 9th heat exchanger；Described
The exhaust pipe outlet of one heat exchanger is connected with the 5th shut-off valve and the 7th shut-off valve import respectively, so that tail gas is divided into two branch
Road；The oil-gas pipeline import of 8th heat exchanger is connected with the outlet of the first shut-off valve, oil-gas pipeline outlet and the second cut-off
The import of valve is connected, and exhaust pipe import is connected with the outlet of the 5th shut-off valve, exhaust pipe outlet and the 6th shut-off valve into
Mouth is connected；
The oil-gas pipeline import of 9th heat exchanger is connected with the outlet of third shut-off valve, oil-gas pipeline outlet and the
The import of four shut-off valves is connected, and exhaust pipe import is connected with the outlet of the 7th shut-off valve, exhaust pipe outlet and the 8th cut-off
The import of valve is connected；The outlet of second shut-off valve is connected with the outlet of the 4th shut-off valve, pools after a pipeline with
The oil-gas pipeline import of one heat exchanger is connected；The outlet of 6th shut-off valve is connected with the outlet of the 8th shut-off valve, pools
Outlet after one pipeline as tail gas.
The import of the oil-gas pipeline and exhaust pipe of 8th heat exchanger and the 9th heat exchanger is respectively positioned on respective heat exchange
The two sides of device, to realize counterflow heat exchange.In the 4th heat exchanger unit, pre-cooling is provided for oil gas using the remaining cooling capacity of tail gas,
So that the most of moisture in oil gas is condensed at 0~4 DEG C, the comprehensive utilization of energy is realized；And use two heat exchangers switchover operation
Mode, when making the operation of heat exchanger, the draining of another heat exchanger or defrosting increase the stability of device continuous operation.
It is required if to be processed to the concentration standard that can be discharged when more containing low boiling component in oil gas to be processed
Cryogenic temperature also require lower, needed in refrigerant circuit using the higher Diversity refrigerant of low boiling component concentration.This
It will lead to the compressor of refrigerant circuit in oil and gas separating system in the pressure ratio and excessive discharge temperature for starting temperature-fall period, significantly
The compressor service life is reduced, even resulting in compressor cannot open because of pressure protection, prevent entire oil and gas separating system from normal
Operation, cooling efficiency are low.It to solve these problems, can be in the rectifier unit in another preferred technical solution
First Variable Composition circuit and the second Variable Composition circuit in parallel is set between compressor air suction mouth.
First Variable Composition circuit includes the 9th shut-off valve, fluid reservoir and the tenth shut-off valve being sequentially connected in series；Second Variable Composition
Circuit includes the 11st shut-off valve, the first air accumulator and the 12nd shut-off valve being sequentially connected in series；The import of 9th shut-off valve
It is connected with the outlet at bottom of rectifier unit, the import of the 11st shut-off valve and the capital heat exchanger top exit of rectifier unit
It is connected, the outlet of the tenth shut-off valve and the outlet of the 12nd shut-off valve are connected with compressor air suction mouth.
It in the enabling of various process and is deactivated by the first Variable Composition circuit and the second Variable Composition circuit, is participated in adjust
The concentration of low boiling component in the mix refrigerant of circulation, can improve start process, or reach lower cryogenic temperature.
It, can be in the first throttle element to be further convenient for adjusting the content of low boiling point refrigerant in refrigerant circuit
Import and the third heat exchanger positive stream refrigerant tubing outlet between be equipped with the 5th separator；5th separator
Third Variable Composition circuit is equipped between the air entry of compressor；The third Variable Composition circuit includes the ten be sequentially connected in series
Three shut-off valves, the second air accumulator and the 14th shut-off valve, the import and the gaseous phase outlet phase of the 5th separator of the 13rd shut-off valve
Even.
The condenser, First Heat Exchanger, the second heat exchanger, third heat exchanger, evaporator, the 4th heat exchanger, the 5th
Common set can be selected in heat exchanger, the 6th heat exchanger, the 7th heat exchanger, bottom heat exchanger, the 8th heat exchanger and the 9th heat exchanger
Pipe heat exchanger, spray-type heat exchanger, shell and tube exchanger or plate-fin heat exchanger.The pipeline that connects according to actual needs and
Specific occasion selects different types of heat exchanger.Preferred plate-fin heat exchanger in the present invention.
The refrigerant used in the oil and gas separating system is common for non-azeotropic mixed working medium more than binary or binary
Component mainly have: nitrogen, inert gas, hydro carbons, the halide of hydrocarbon, carbon dioxide etc..
Each restricting element is manual throttle valve, automatic throttle or capillary, to play the role of throttling cooling.
Rectifying column in the rectifier unit is material filling type or column plate type.
Each shut-off valve is two-way shut-off valve manually or automatically, to realize the automatic or manual control of shut-off valve
System, wherein the first shut-off valve and the second shut-off valve link, third shut-off valve and the 4th shut-off valve link, the 5th shut-off valve and the 6th
Shut-off valve linkage, the 7th shut-off valve and the 8th shut-off valve link.
Compared with prior art, the invention has the benefit that
(1) structure of refrigeration system of the invention simplifies, reliable for operation.For the oil gas more containing low boiling point component, institute
The lowest refrigerating temperature needed is lower, and such as -110 DEG C~-130 DEG C.Reach such low cryogenic temperature, traditional mix refrigerant
Auto-cascading refrigeration system generally requires 2~5 grades of separation processes.The present invention replaces multi-stage separation process using rectifier unit, can
So that system structure greatly simplifies, and to enter the lubricating oil carried in the refrigerant of low-temperature zone and be efficiently removed,
It ensure that the reliability service of system.
(2) thermodynamic efficiency of oil gas condensation separation system can be improved in the present invention.For the oil gas of heterogeneity, according to it
Water equivalent characteristic distributions and flow in temperature-fall period are different, the difference drawn at adjustable rectifier unit bottom, top two
The flow and hybrid position of the high pressure mixing refrigerant of ingredient reduce heat transfer temperature difference to optimize the Temperature Distribution in heat exchanger,
To improve the thermodynamic efficiency of system, reduce system wasted work.
(3) present invention makes full use of the waste cold of tail gas.If water content is more in oil gas or does not have before carrying out condensation process
It crosses and is dried, then oil gas is pre-chilled in the waste cold that can use in tail gas, so that most of water condensation is got off, reduces rear
A possibility that continuous low-temperature zone frosting.Precool heat exchanger device unit increases the continuous operation of device by the way of switchover operation simultaneously
Stability.
(4) present invention has effectively recycled the cooling capacity of the oil product condensed out.Current less invention is related to the cold of cold oil
Amount utilizes, so the present invention is directed to this point, is used to gradually reduce rectifier unit kettle base solution for the cryogenic condensation oil of different temperatures
The pre-cooling of cryogen, takes full advantage of the cooling capacity of cold oil, while reducing the temperature of bottom of the kettle liquid body refrigerant, and it is right to be conducive to its
The pre-cooling of high-pressure refrigerant.The comprehensive utilization of energy is embodied, the wasted work of system is further decreased.
(5) present invention can optimize the beginning temperature-fall period of oil and gas separating system, improve rate of temperature fall.Start temperature-fall period
Interior, the increase of high boiling component concentration can reduce the booting pressure of system in mix refrigerant, improve stage inner compressor exhaust
Temperature is excessively high and pressure ratio problem bigger than normal, improves the dynamic operational behaviour of system.
(6) present invention can optimize the final temperature-fall period of oil and gas separating system, so that system reaches lower cryogenic temperature,
The thermodynamic efficiency of raising system.In the terminal stage that cools down, the increase of low boiling component concentration can improve heat exchange in mix refrigerant
The water equivalent matching of high and low pressure side mix refrigerant in device.To reduce the attainable minimum temperature of system, the heat of system is improved
Mechanical property.
(7) three equal structures in Variable Composition circuit of the invention are simple, and regulating power is strong, easy to operate.Just in system design
Several Variable Composition circuits can be set according to the lowest refrigerating temperature of required realization, it can also be when system be run according to need
Enable several Variable Composition circuits.
Detailed description of the invention
Fig. 1 is the structural representation of the first embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the present invention
Figure；
Fig. 2 is the structural representation of second of embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the present invention
Figure；
Fig. 3 is the structural representation of the third embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the present invention
Figure；
Fig. 4 is the structural representation of the 4th kind of embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the present invention
Figure；
Fig. 5 is the structural representation of the 5th kind of embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the present invention
Figure.
Specific embodiment
With reference to the accompanying drawings and detailed description to a kind of rectification type Auto-cascade cycle low temperature cold with cold recovery of the present invention
Solidifying oil and gas separating system is described in further detail.
Embodiment 1
As shown in Figure 1, a kind of rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery, including compressor
1, condenser 2, rectifier unit 3, First Heat Exchanger 4, the second heat exchanger 5, third heat exchanger 6, evaporator 7, the 4th heat exchanger 12,
5th heat exchanger 13, the 6th heat exchanger 14, the 7th heat exchanger 15, the first separator 8, the second separator 9, third separator 10,
4th separator 11, first throttle element 16, the second restricting element 17, third restricting element 18, the 4th restricting element the 19, the 5th
Restricting element 20, the 6th restricting element 21 and the 7th restricting element 22.
Include in rectifier unit 3 rectifying column and with the capital heat exchanger that is connected at the top of rectifying column, set in the heat exchanger of capital
There is cooling pipe.Positive stream refrigerant tubing, one are equipped in First Heat Exchanger 4, the second heat exchanger 5 and third heat exchanger 6
A refrigerant tubing that backflows, an oil-gas pipeline and an exhaust pipe are equipped with the import being connected to pipeline on outer wall or go out
Mouthful, be equipped with a low pressure refrigerant pipeline and an oil-gas pipeline in evaporator 7, outer wall be equipped with the import being connected to pipeline or
Outlet.Be equipped in 4th heat exchanger 12, the 5th heat exchanger 13, the 6th heat exchanger 14 and the 7th heat exchanger 15 kettle base solution pipeline,
Reflux pipeline and multiple condensation oil-pipings are equipped with the import or export being connected to pipeline on outer wall；Specifically, the 4th heat exchange
There are four oil-gas pipeline (first, second, third, fourth) in device 12, in the 5th heat exchanger 13 there are three oil-gas pipeline (first,
Second, third), there are two oil-gas pipeline (first, second) in the 6th heat exchanger 14, there is an Oil/Gas Pipe in the 7th heat exchanger 15
Road (first).
The outlet 1b of compressor 1 is connected with the refrigerant inlet 2a of condenser 2, the refrigerant outlet 2b and essence of condenser 2
The middle part feed inlet 3a of rectifying column is connected in distillation unit 3, the rectifying column bottom liquid outlet 3b of rectifying column 3 and the 4th heat exchanger 12
Kettle base solution conduit entrance 12a is connected；The capital exchanger base phegma outlet 3f of rectifier unit 3 and returning for the 4th heat exchanger 12
Flow liquid conduit entrance 12c is connected；The high-pressure refrigerant of capital the heat exchanger top exit 3c and First Heat Exchanger 4 of rectifier unit 3
Conduit entrance 4a is connected.
The positive stream refrigerant tubing import 5a of the outlet of positive stream the refrigerant tubing 4b and the second heat exchanger 5 of First Heat Exchanger 4
It is connected；The refrigerant tubing outlet 5d phase of backflowing of backflow the refrigerant tubing import 4c and the second heat exchanger 5 of First Heat Exchanger 4
Even, the refrigerant tubing that backflows outlet 4d is then connected with the cooling pipe import 3d in 3 capital heat exchanger of rectifier unit；First heat exchange
Oil-gas pipeline import in device 4 is 4g, and exhaust pipe outlet is 4f；Oil-gas pipeline in First Heat Exchanger 4 exports 4h and first
The import 8a of separator 8 is connected, and exhaust pipe import 4e is connected with the exhaust pipe of the second heat exchanger 5 outlet 5f.First heat exchange
Positive stream refrigerant tubing import 4a, the refrigerant tubing that backflows outlet 4d, exhaust pipe in device 4 export 4f, oil-gas pipeline import
4g is in the same side, and positive stream refrigerant tubing outlet 4b, the refrigerant tubing import 4c that backflows, oil-gas pipeline export 4h, offgas duct
Import 4e in road is in the other side, to realize the reverse heat-exchange of cold fluid and hot fluid.
The positive stream refrigerant tubing import 6a of the outlet of positive stream the refrigerant tubing 5b and third heat exchanger 6 of second heat exchanger 5
It is connected, the refrigerant tubing import 5c that backflows is connected with the refrigerant tubing outlet 6d that backflows of third heat exchanger 6；Second heat exchanger 5
The exhaust pipe outlet 6f of exhaust pipe import 5e and third heat exchanger 6 be connected, oil-gas pipeline import 5g and the first separator 8
Gaseous phase outlet 8c be connected, oil-gas pipeline outlet 5h be connected with the import 9a of the second separator 9.Positive stream system in second heat exchanger 5
Cryogen conduit entrance 5a, the refrigerant tubing that backflows outlet 5d, exhaust pipe export 5f, oil-gas pipeline import 5g in the same side, and
Positive stream refrigerant tubing exports 5b, the refrigerant tubing import 5c that backflows, exhaust pipe import 5e, oil-gas pipeline outlet 5h another
Side, to realize the reverse heat-exchange of cold fluid and hot fluid.
The positive stream refrigerant tubing outlet 6b of third heat exchanger 6 is connected with the import 16a of first throttle element 16, first segment
The outlet 16b of fluid element is then connected with the low pressure refrigerant conduit entrance 7a of evaporator 7；The refrigerant that backflows of third heat exchanger 6
Conduit entrance 6c is connected with the refrigerant tubing outlet 7b that backflows of evaporator 7；The exhaust pipe import 6e of third heat exchanger 6 and
The gaseous phase outlet 11c of four separators 11 is connected, and oil-gas pipeline import 6g is connected with the gaseous phase outlet 9c of the second separator 9, oil gas
Pipe outlet 6h is connected with the import 10a of third separator 10.Positive stream refrigerant tubing import 6a in third heat exchanger 6, it backflows
Refrigerant tubing exports 6d, exhaust pipe outlet 6f, oil-gas pipeline import 6g in the same side, and positive stream refrigerant tubing exports
6b, the refrigerant tubing import 6c that backflows, exhaust pipe import 6e, oil-gas pipeline outlet 6h are in the other side, to realize cold fluid and hot fluid
Reverse heat-exchange.
The exhaust pipe import 7c of evaporator 7 is connected with the gaseous phase outlet 10c of third separator 10, and exhaust pipe exports 7d
It is connected with the import 11a of the 4th separator 11；The outlet 7b and exhaust pipe import 7c of 7 low pressure refrigerant pipeline of evaporator exist
The same side, the outlet the import 7a and exhaust pipe 7d of 7 low pressure refrigerant pipeline of evaporator is in the other side, to realize cold fluid and hot fluid
Reverse heat-exchange.
The kettle base solution pipe outlet 12b of 4th heat exchanger 12 is connected with the kettle base solution conduit entrance 13a of the 5th heat exchanger 13,
Reflux pipeline outlet 12d is connected with the reflux pipeline import 13c of the 5th heat exchanger 13；First condensation of the 4th heat exchanger 12
Oil-piping outlet is 12n, and the first cold oil conduit entrance 12m is connected with the liquid-phase outlet 8b of the first separator 8；4th heat exchanger
12 the second cold oil pipe outlet is 12k, the first condensation oil pipe of the second cold oil conduit entrance 12j and the 5th heat exchanger 13
Road exports 13k and is connected；The third cold oil pipe outlet of 4th heat exchanger 12 is 12h, third cold oil conduit entrance 12g and the
Second cold oil pipe outlet 13h of five heat exchangers 13 is connected；4th cold oil pipe outlet of the 4th heat exchanger 12 is 12f,
4th condensation oil-piping is connected into 12e with the third cold oil pipe outlet 13f of the 5th heat exchanger 13；In 4th heat exchanger 12
Kettle base solution conduit entrance 12a, reflux pipeline import 12c, the first cold oil pipe outlet 12n, the second cold oil pipe outlet
12k, third cold oil pipe outlet 12h, the 4th condensation oil-piping 12f are in the same side, and kettle base solution pipe outlet 12b, reflux
Liquid pipe outlet 12d, the first cold oil conduit entrance 12m, the second cold oil conduit entrance 12j, third cold oil conduit entrance
12g, the 4th cold oil conduit entrance 12e are in the other side, to realize the reverse heat-exchange of cold fluid and hot fluid.
The kettle base solution pipe outlet 13b of 5th heat exchanger 13 is connected with the kettle base solution conduit entrance 14a of the 6th heat exchanger 14,
Reflux pipeline outlet 13d is connected with the reflux pipeline import 14c of the 6th heat exchanger 14；First condensation of the 5th heat exchanger 13
The import 13j of oil-piping is connected with the liquid-phase outlet 9b of the second separator 9, and the import 13g of the second condensation oil-piping is changed with the 6th
First cold oil pipe outlet 14h of hot device 14 is connected, third condense oil-piping import 13e and the 6th heat exchanger 14 second
Cold oil pipe outlet 14f is connected；Kettle base solution conduit entrance 13a, reflux pipeline import 13c in 5th heat exchanger 13,
One cold oil pipe outlet 13k, the second cold oil pipe outlet 13h, third cold oil pipe outlet 13f are in the same side, and kettle
Bottom liquid pipe outlet 13b, reflux pipeline export 13d, the first cold oil conduit entrance 13j, the second cold oil conduit entrance
13g, third cold oil conduit entrance 13e are in the other side, to realize the reverse heat-exchange of cold fluid and hot fluid.
The kettle base solution pipe outlet 14b of 6th heat exchanger 14 is connected with the kettle base solution conduit entrance 15a of the 7th heat exchanger 15,
Reflux pipeline outlet 14d is connected with the reflux pipeline import 15c of the 7th heat exchanger 15；First condensation of the 6th heat exchanger 14
Oil-piping import 14g is connected with the liquid-phase outlet 10b of third separator 10, the heat exchange of the second cold oil conduit entrance 14e and the 7th
First cold oil pipe outlet 15f of device 15 is connected；Kettle base solution conduit entrance 14a, reflux pipeline in 6th heat exchanger 14
Import 14c, the first condensation oil-piping outlet 14h, the second cold oil pipe outlet 14f in the same side, and kettle base solution pipeline goes out
Mouthful 14b, reflux pipeline outlet 14d, the first cold oil conduit entrance 14g, the second cold oil conduit entrance 14e in the other side,
To realize the reverse heat-exchange of cold fluid and hot fluid.
The kettle base solution pipe outlet 15b of 7th heat exchanger 15 passes through the import with the second restricting element 17 respectively of three articles of branches
17a, the import 18a of third restricting element 18, the import 19a of the 4th restricting element 19 are connected；The phegma of 7th heat exchanger 15
Pipe outlet 15d passes through another three articles of branches import with the import 20a, the 6th restricting element 21 of the 5th restricting element 20 respectively
21a, the import 22a of the 7th restricting element 22 are connected；First cold oil conduit entrance 15e of the 7th heat exchanger 15 is separated with the 4th
The liquid-phase outlet 11b of device 11 is connected；Kettle base solution conduit entrance 15a, reflux pipeline import 15c in 7th heat exchanger 15,
One cold oil pipe outlet 15f is in the same side, and kettle base solution pipe outlet 15b, reflux pipeline export 15d, the first cold oil
Conduit entrance 15e is in the other side, to realize the reverse heat-exchange of cold fluid and hot fluid.
Low pressure of the outlet 20b for exporting 17b, the 5th restricting element 20 of second restricting element 17 with First Heat Exchanger 4
Refrigerant tubing import 4c is connected, or is connected with the low pressure refrigerant pipe outlet 5d of the second heat exchanger 5；Third restricting element 18
Outlet 18b, the 6th restricting element 21 outlet 21b be connected with the low pressure refrigerant conduit entrance 5c of the second heat exchanger 5, or
It is connected with the low pressure refrigerant pipe outlet 6d of third heat exchanger 6；Outlet 19b, the 7th restricting element of 4th restricting element 19
22 outlet 22b is connected with the low pressure refrigerant conduit entrance 6c of third heat exchanger 6, or the low pressure refrigerant with evaporator 7
Pipe outlet 7b is connected.
Capital heat exchanger, First Heat Exchanger 4, the second heat exchanger of condenser 2, rectifier unit 3 in above embodiment
5, third heat exchanger 6, evaporator 7, the 4th heat exchanger 12, the 5th heat exchanger 13, the 6th heat exchanger 14 and the 7th heat exchanger 15 are
Plate-fin heat exchanger.
First throttle element 16, the second restricting element 17, third restricting element the 18, the 4th in above embodiment throttle
Element 19, the 5th restricting element 20, the 6th restricting element 21 and the 7th restricting element 22 are manual throttle valve, also be can be selected common
Automatic throttle or capillary, with play the role of throttling cooling.
Rectifier unit 3 in above embodiment is similar with the rectifier unit in common refrigerating plant, and rectifying column is selected normal
The column plate type rectifying column or material filling type rectifying column of rule.
Connection between above-mentioned all parts is connected using refrigerant tubing, and waterproof and heat preservation are wrapped up outside cryogenic pipe
Material.
Refrigerant used in rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery is binary or binary
Above mixed non-azeotropic refrigerant, common component mainly have: nitrogen, inert gas, hydro carbons, the halide of hydrocarbon, titanium dioxide
Carbon etc..
For ease of understanding, the above-mentioned rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery can be divided into system
Refrigerant circuit and oil gas circuit, are detailed workflow below:
In refrigerant circuit, mixed non-azeotropic refrigerant is condensed into after the pressurization of compressor 1 by condenser 2
The high-pressure fluid of gas-liquid two-phase enters back into the kettle of rectifier unit 3.Gaseous state mix refrigerant passes through rectifier unit 3 from top to bottom
Rectifying column, carry out heat and mass transfer process with the phegma that flows down at the top of rectifier unit 3；Higher boiling group in mix refrigerant
Divide, compressor lubricant oil and a small amount of low boiling component are condensed a part as phegma；Most of low boiling point
The gaseous state mix refrigerant that component is constituted passes through the capital heat exchanger of rectifier unit 3, flows out from top exit 3c.This strand of gaseous state is mixed
It closes refrigerant and successively passes through First Heat Exchanger 4, the second heat exchanger 5, the cooling of third heat exchanger 6, continue through first throttle element
16 throttling coolings subsequently into providing cooling capacity in evaporator 7, then are successively backflowed by third heat exchanger 6, the second heat exchanger 5, the
The capital heat exchanger of one heat exchanger 4, rectifier unit 3, respectively oil gas and distillation process provide cooling capacity, finally return that compressor 1
Air entry.
Liquid refrigerant based on high boiling component is flowed out from the outlet at bottom 3b of rectifier unit 3, respectively enters the 4th
Heat exchanger 12, the 5th heat exchanger 13, the 6th heat exchanger 14, the 7th heat exchanger 15 be condensed oil cool down step by step, then pass through difference
Branch respectively enters the second restricting element 17, third restricting element 18, the 4th restricting element 19, after throttling and with low boiling point
Based on the refrigerant that backflows mixed in different position.Adjust the second restricting element 17 or third restricting element 18 or the 4th throttling
The aperture of element 19, can make this strand of liquid refrigerant and the refrigerant that backflows mixes in different proportions, to match heat exchanger
In water equivalent.
Phegma based on intermediate boiling component is flowed out from the outlet at bottom 3f of the capital heat exchanger of rectifier unit 3, point
Not Jin Ru the 4th heat exchanger 12, the 5th heat exchanger 13, the 6th heat exchanger 14, the 7th heat exchanger 15 oil that is condensed cool down step by step, so
The 5th restricting element 20, the 6th restricting element 21, the 7th restricting element 22 are respectively enterd by different branch afterwards, after throttling
It is mixed with the refrigerant that backflows based on low boiling point in different positions.Adjust the 5th restricting element 20 or the 6th restricting element 21
Or the 7th restricting element 22 aperture, this strand of liquid refrigerant and the refrigerant that backflows can be made to mix in different proportions, with
Match the water equivalent in heat exchanger.
In oil gas circuit, the oil gas of high temperature or room temperature first passes around the cooling of First Heat Exchanger 4, into the first separator 8,
The oil product that partial liquefaction is got off is separated；Not liquefied oil gas goes successively to the second heat exchanger 5 and is cooled to lower temperature
Degree, into the second separator 9, the oil product of partial liquefaction again is separated；Not liquefied oil gas is further continued for changing into third
Hot device 6 continues to cool down, and into third separator 10, the oil product of partial liquefaction again is separated；Finally, not liquefied oil gas
Cool down into evaporator 7, into the 4th separator, liquefied oil product is separated.
By the adjusting of system parameters, it is ensured that not liquefied oil gas has had reached the discharge mark in national standard at this time
It is quasi-.The cooling capacity for not utilizing the non-blau gas in this part, it is successively backflowed by third heat exchanger 6, the second heat exchanger 5, first
Heat exchanger 4 is discharged in the form of tail gas after rewarming.The oil product that first separator 8 is separated is flowed out from liquid-phase outlet, into the
Four heat exchangers 12 provide cooling capacity, are discharged after rewarming；The oil product that second separator 9 is separated from liquid-phase outlet flow out, successively into
Enter the 5th heat exchanger 13 and the 4th heat exchanger 12 provides cooling capacity, is discharged after rewarming；The oil product that third separator 10 is separated from
Liquid-phase outlet outflow sequentially enters the 6th heat exchanger 14, the 5th heat exchanger 13 and third heat exchanger 12 and provides cooling capacity, rewarming heel row
Out；The oil product that 4th separator 11 is separated is flowed out from liquid-phase outlet, sequentially enters the 7th heat exchanger 15, the 6th heat exchanger
14, the 5th heat exchanger 13 and the 4th heat exchanger 12 provide cooling capacity, are discharged after rewarming.Finally from the first condensation of the 4th heat exchanger 12
The cold oil of the outlet outflow of oil-piping, the second condensation oil-piping, third condensation oil-piping and the 4th condensation oil-piping can converge
It gathers or returns to storage tank respectively or otherwise store or otherwise utilize.
Cryogenic condensation separation is carried out using the method for the present invention to certain petrochemical plant entrucking oil gas.Oil gas temperature is 35 DEG C, flow
For 30m3/ h, oil gas ingredient and concentration are as shown in table 1:
1. oil gas of table composition and each component concentration
| Component | Molar fraction (%) | Component | Molar fraction (%) |
| Methane | 0.68 | Pentane | 0.68 |
| Ethane | 1.24 | Isopentane | 6.00 |
| Propane | 1.70 | N-hexane | 4.10 |
| Normal butane | 11.20 | Nitrogen | 51.90 |
| Iso-butane | 8.70 | Oxygen | 13.80 |
Using process described in embodiment 1, using certain Diversity refrigerant, the operating condition of refrigerant circuit are as follows: low pressure
For 200kPa, high pressure 2000kPa, it is assumed that compressor adiabatic efficiency is 85%, ignores each heat exchanger pressure drop and leakage heat.Utilize change
Work software HYSYS carry out flowsheeting, as the result is shown: the refrigerant liquid of bottom can be condensed before throttling oil be cooled in advance
About -32 DEG C, oil gas can be condensed to -130 DEG C, and normal butane, iso-butane, pentane, isopentane, n-hexane are condensed, tail gas
In only these hydro carbons of remaining methane, ethane, propane, specific concentration it is as shown in table 2:
2. tail gas of table composition and each component concentration
| Component | Molar fraction (%) |
| Methane | 0.56 |
| Ethane | 1.41 |
| Propane | 0.11 |
| Nitrogen | 75.14 |
| Oxygen | 22.77 |
Through calculating, in the example, non-methane total hydrocarbons content is about 21.5g/m in tail gas3, it is lower than national standard, often stands
The oil vapor treatment power consumption of side is about 0.19kWh, bright compared to having for the processing power consumption 0.27kWh of no cold recovery system
Aobvious reduction.
Embodiment 2
As shown in Fig. 2, and 1 connection type of embodiment it is identical as structure, the difference is that in rectifier unit bottom liquid
It exports and is equipped with device for drying and filtering 23 and bottom heat exchanger 24 between the 3b and kettle base solution conduit entrance 12a of the 4th heat exchanger 12.
A high-pressure refrigerant pipeline and a low pressure refrigerant pipeline are equipped in bottom heat exchanger 24.Specifically, rectifying
The bottom liquid outlet 3b of device 3 is connected with the import 23a of device for drying and filtering 23, the outlet 23b of device for drying and filtering 23 and bottom
The high-pressure refrigerant conduit entrance 24a of heat exchanger 24 is connected；The high-pressure refrigerant pipe outlet 24b of bottom heat exchanger 24 and the 4th
The kettle base solution conduit entrance 12a of heat exchanger 12 is connected；The capital heat exchanger cooling pipe road outlet 3e of rectifier unit 3 and bottom exchange heat
The low pressure refrigerant conduit entrance 24c of device 24 is connected；The low pressure refrigerant pipe outlet 24d and compressor 1 of bottom heat exchanger 24
Air entry 1a be connected.
In bottom heat exchanger 24, high-pressure refrigerant conduit entrance 24a and low pressure refrigerant pipe outlet 24d are same
Side, high-pressure refrigerant pipe outlet 24b and low pressure refrigerant conduit entrance 24c are in the other side, to realize the reverse of cold fluid and hot fluid
Heat exchange.
Embodiment 3
As shown in figure 3, and 1 connection type of embodiment it is identical as structure, the difference is that having increased the 4th heat exchanger list newly
Member.
4th heat exchanger unit includes the 8th heat exchanger 26, the 9th heat exchanger 29 and the cut-off of the first shut-off valve 25, second
Valve 27, third shut-off valve 28, the 4th shut-off valve 30, the 5th shut-off valve 31, the 6th shut-off valve 32, the 7th shut-off valve 33 and the 8th section
Only valve 34, the 8th heat exchanger 26 and the 9th heat exchanger 29 are arranged in parallel.Wherein the first shut-off valve 25 and the second shut-off valve 27 link,
Third shut-off valve 28 and the 4th shut-off valve 30 link, and the 5th shut-off valve 31 and the 6th shut-off valve 32 link, the 7th shut-off valve 33 and
The linkage of 8th shut-off valve 34.
Specifically, oil gas is connected with the import 25a of the first shut-off valve 25 and 28 import 28a of third shut-off valve respectively first；
The exhaust pipe of First Heat Exchanger 4 exports the 4f import 33a with the import 31a of the 5th shut-off valve 31 and the 7th shut-off valve 33 respectively
It is connected, so that tail gas is divided into two branches；The outlet of the oil-gas pipeline import 26a of 8th heat exchanger 26 and the first shut-off valve 25
25b is connected, and oil-gas pipeline outlet 26b is connected with the import 27a of the second shut-off valve 27, the cut-off of exhaust pipe import 26c and the 5th
The outlet 31b of valve 31 is connected, and exhaust pipe outlet 26d is connected with the import 32a of the 6th shut-off valve 32；The oil of 9th heat exchanger 29
Feed channel import 29a is connected with the outlet 28b of third shut-off valve 28, and oil-gas pipeline exports the import of 29b and the 4th shut-off valve 30
30a is connected, and exhaust pipe import 29c is connected with the outlet 33b of the 7th shut-off valve 33, and exhaust pipe exports the cut-off of 29d and the 8th
The import 34a of valve 34 is connected；Second cut-off valve outlet 27b and the 4th cut-off valve outlet 30b are connected, pool after a pipeline with
The oil-gas pipeline import 4g of First Heat Exchanger 4 is connected；The outlet 34b of the outlet 32b and the 8th shut-off valve 34 of 6th shut-off valve 32
It is connected, pools the outlet after a pipeline as tail gas.
The outlet the oil-gas pipeline import 26a and exhaust pipe 26d of 8th heat exchanger 26 is located at the same side, oil-gas pipeline outlet
26b and exhaust pipe import 26c is located at the other side, to realize counterflow heat exchange；The oil-gas pipeline import 29a of 9th heat exchanger 29 and
Exhaust pipe outlet 29d is located at the same side, and oil-gas pipeline outlet 29b and exhaust pipe import 29c is located at the other side, inverse to realize
Stream heat exchange.
The workflow of system is similar in embodiment 1, the difference is that opening simultaneously the first cut-off when just bringing into operation
Valve 25, the second shut-off valve 27, the 5th shut-off valve 31 and the 6th shut-off valve 32, simultaneously close off third shut-off valve 28, the 4th shut-off valve
30, in the 8th heat exchanger 26 heat exchange occurs for the 7th shut-off valve 33 and the 8th shut-off valve 34, oil gas and tail gas to be processed, utilizes
Oil gas is pre-chilled to condense most of steam in the waste cold of tail gas, and at this time the 9th heat exchanger 29 implements draining or defrosting process；When being
After system operation a period of time, the first shut-off valve 25, the second shut-off valve 27, the 5th shut-off valve 31, the 6th shut-off valve 32 are simultaneously closed off,
Third shut-off valve 28, the 4th shut-off valve 30, the 7th shut-off valve 33, the 8th shut-off valve 34 are opened simultaneously, by changing for oil gas and tail gas
Thermal process is switched in the 9th heat exchanger 29 and carries out, and the 8th heat exchanger 26 implements draining or defrosting process at this time.
Embodiment 4
As shown in figure 4, the rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery includes that normal concentration is returned
Road, the first Variable Composition circuit, the second Variable Composition circuit.Normal concentration circuit Oil-gas Separation and cold oil cooling capacity in embodiment 1
The connection type for recycling circuit is similar with structure, but the first Variable Composition circuit and second are increased between rectifying column and compressor
Variable Composition circuit.Each circuit is illustrated below:
(1) normal concentration circuit:
The component in normal concentration circuit and connection are similar with embodiment 1, the difference is that: the capital of rectifier unit 3
Outlet 3c at the top of heat exchanger is connected with two parallel branches respectively, wherein the positive stream of a branch and First Heat Exchanger 4 is freezed
Agent conduit entrance 4a is connected, and another article of branch is connected with the import 38a of the 11st shut-off valve 38；The rectifying column bottom of rectifier unit 3
Portion liquid outlet 3b is connected with four parallel branches respectively, i.e., respectively with the import 17a of the second restricting element 17, third restricting element
The import 35a of 18 import 18a, the import 19a of the 4th restricting element 19 and the 9th shut-off valve 35 are connected.
(2) first Variable Composition circuits:
First Variable Composition circuit is by being sequentially connected in series 37 groups of the 9th shut-off valve 35, fluid reservoir 36 and the tenth shut-off valve of setting
At.Wherein the import 35a of the 9th shut-off valve 35 is connected with the outlet at bottom 3b of rectifier unit 3, the import of outlet and fluid reservoir 36
36a is connected；The import 37a of tenth shut-off valve 37 is connected with the outlet 36b of fluid reservoir 36, exports the air entry of 37b and compressor 1
1a is connected.
(3) second Variable Composition circuits:
Second Variable Composition circuit by being sequentially connected in series the 11st shut-off valve 38 of setting, the first air accumulator 39 and the 12nd ends
Valve 40 forms.Wherein the import 38a of the 11st shut-off valve 38 is connected with the top exit 3c of rectifier unit 3, exports 38b and first
The import 39a of air accumulator 39 is connected；The import 40a of 12nd shut-off valve 40 is connected with the outlet 39b of the first air accumulator 39, outlet
40b is connected with the air entry 1a of compressor 1.
The 9th shut-off valve 35, the tenth shut-off valve 37, the 11st shut-off valve 38, the 12nd shut-off valve 40 in the embodiment
For manually or automatically two-way shut-off valve.
For ease of understanding, it is detailed workflow below:
The normal concentration circuit of refrigerant, Oil-gas Separation loop works process are identical as described in embodiment 1, difference
Be be switched on before to confirm the 9th shut-off valve 35, the tenth shut-off valve 37, the 11st shut-off valve 38, the 12nd shut-off valve 40 all in
Closed state.
With time duration, the cryogenic temperature of oil and gas separating system constantly declines, after the sufficiently long time, in environment
In the case that temperature and oil gas thermic load are constant, system reaches steady operational status, cryogenic temperature mix refrigerant just
Lowest limit is reached under normal concentration.At this point, the first Variable Composition circuit and the second Variable Composition circuit, which is respectively started, to be realized
Lower cryogenic temperature.
It enables the first Variable Composition circuit: opening the 9th shut-off valve 35, will be enriched in the mix refrigerant of high boiling component from essence
Fractional distillation column bottom is introduced into fluid reservoir 36, the 9th shut-off valve 35 is closed after a period of time, so that higher boiling group in normal concentration circuit
Divide refrigerant to reduce, improve the concentration of low boiling component in the refrigerant for participating in circulation, realization can be freezed than normal concentration more
Light hydrocarbon in oil gas can be handled more thorough by low cryogenic temperature.
Enable the second Variable Composition circuit: opening the 12nd shut-off valve 40, will be enriched in the mix refrigerant of low boiling component from
It is released in first air accumulator 39, the 12nd shut-off valve 40 is closed after a period of time, so that participating in circulation in normal concentration circuit
Low boiling point refrigerant increases, therefore improves the low boiling component concentration for participating in circulation, can be than normal concentration and enabling first
Refrigeration behind Variable Composition circuit realizes lower temperature.
After enough long-plays, in the case where environment temperature and constant thermic load, system reaches stable again
State has reached new lowest limit under the refrigerant concentration of cryogenic temperature after the change.Before shutdown, successively deactivates second and thicken
Spend circuit and the first Variable Composition circuit, low boiling component concentration when can gradually reduce shutdown in mix refrigerant.
It deactivates the second Variable Composition circuit: opening the 11st shut-off valve 38, will be enriched in the mix refrigerant storage of low boiling component
It is stored in the first air accumulator 39, the 11st shut-off valve 38 is closed after a period of time, so that participating in the refrigerant low boiling point group of circulation
Point concentration continues to reduce.
It deactivates the first Variable Composition circuit: opening the tenth shut-off valve 37, the mixing of high boiling component will be rich in fluid reservoir 36
Refrigerant is released, and the tenth shut-off valve 37 is closed after a period of time, so that the refrigerant low boiling component concentration for participating in circulation continues
Reduce.
It can be shut down after deactivating two Variable Composition circuits, the two Variable Composition circuits can be in the relaying of booting operation next time
Continuous enabling is single or two enable simultaneously.
Embodiment 5
As shown in figure 5, it is identical as the structure of embodiment 4 and connection type, the difference is that: in first throttle element 16
Import 16a and third heat exchanger 6 high-pressure refrigerant pipe outlet 6b between be equipped with the 5th separator 44, the 5th separator 44
Third Variable Composition circuit is equipped between the air entry 1a of compressor 1；Third Variable Composition circuit is by be sequentially connected in series the 13rd section
Only valve 41, the second air accumulator 42, the 14th shut-off valve 43 composition；Wherein, the import 41a of the 13rd shut-off valve 41 is separated with the 5th
The gaseous phase outlet 44c of device 44 is connected, and outlet 41b is connected with the import 42a of the second air accumulator 42；The import of 14th shut-off valve 43
43a is connected with the outlet 42b of the second air accumulator 42, and outlet 43b is connected with the air entry 1a of compressor 1.
Method and the embodiment 4 for enabling the first and second Variable Composition circuits are identical.
It enables third Variable Composition circuit: the 14th shut-off valve 43 is opened, by the higher hybrid refrigeration of low boiling component ratio
Agent is released from the second air accumulator 42, and the 14th shut-off valve 43 is closed after a period of time, so that participating in the refrigerant low boiling of circulation
Point concentration of component improves, and can freeze than normal concentration, enable the first Variable Composition circuit refrigeration, enables the second Variable Composition circuit system
It is cold to realize lower cryogenic temperature.
After enough long-plays, in the case where environment temperature and constant thermic load, system reaches stable again
State has reached new lowest limit under the refrigerant concentration of cryogenic temperature after the change.Before shutdown, successively deactivates third and thicken
Spend circuit, the second Variable Composition circuit and the first Variable Composition circuit, low boiling point when can gradually reduce shutdown in mix refrigerant
Concentration of component.
It deactivates third Variable Composition circuit: the 13rd shut-off valve 41 is opened, by the most hybrid refrigeration of amount of components having low boiling points
Agent is stored into the second air accumulator 42, and the 13rd shut-off valve 41 is closed after a period of time, so that participating in the refrigerant low boiling of circulation
Point concentration continues to reduce.
It deactivates the second Variable Composition circuit and deactivated first Variable Composition loop method and embodiment 4 is identical.
The foregoing is merely preferable implementation examples of the invention, are not intended to restrict the invention, it is all in spirit of that invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of rectification type Auto-cascade cycle low-temperature condensing vapour separation system with cold recovery, including compressor (1), condenser
(2), rectifier unit (3) and oil gas condensation separation and cold recovery circuit；Compressor (1) outlet and condenser (2)
Import is connected；The condenser (2) is connected with rectifier unit (3) import；The rectifier unit (3) include rectifying column and
With the capital heat exchanger being connected at the top of rectifying column, capital heat exchanger top exit is separated with oil gas condensation and cold recovery circuit phase
Even, which is characterized in that the oil gas condensation separates and cold recovery circuit includes First Heat Exchanger unit, the second heat exchanger list
Member, third heat exchanger unit, first throttle element (16) and separator unit；
The First Heat Exchanger unit includes one in First Heat Exchanger (4), the second heat exchanger (5) and third heat exchanger (6)
The combination of person or a few persons；
Second heat exchanger unit includes evaporator (7)；
The third heat exchanger unit includes the 4th heat exchanger (12), the 5th heat exchanger (13), the 6th heat exchanger (14) and the
The combination of one of seven heat exchangers (15) or a few persons；
First throttle element (16) is set between First Heat Exchanger unit and the second heat exchanger unit；
Separator unit includes the first separator (8), the second separator (9), third separator (10) and the 4th separator (11)
One of or a few persons combination；
A positive stream refrigerant tubing, the refrigerant pipe that backflows are equipped in each heat exchanger of the First Heat Exchanger unit
Road, an oil-gas pipeline and an exhaust pipe；A low pressure refrigerant pipeline and an oil are equipped in the evaporator (7)
Feed channel；Cooling pipe is equipped in the capital heat exchanger of the rectifier unit (3)；The third heat exchanger unit respectively changes
Kettle base solution pipeline, reflux pipeline and multiple condensation oil-pipings are equipped in hot device；Specifically, it is equipped in the 4th heat exchanger (12)
Four condensation oil-pipings are set in the 5th heat exchanger (13) there are three oil-piping is condensed, and set that there are two cold in the 6th heat exchanger (14)
Solidifying oil-piping, the 7th heat exchanger (15) is interior to be equipped with a condensation oil-piping；First separator (8), the second separator
(9), third separator (10) and the 4th separator (11) are equipped with gaseous phase outlet and liquid-phase outlet；
The positive stream refrigerant tubing import of capital heat exchanger top exit with the First Heat Exchanger (4) is connected；Described first
The positive stream refrigerant tubing outlet of heat exchanger (4) is connected with the positive stream refrigerant tubing import of the second heat exchanger (5)；Described second
The positive stream refrigerant tubing outlet of heat exchanger (5) is connected with the positive stream refrigerant tubing import of third heat exchanger (6)；Described first
The import of restricting element (16) is connected with the outlet of the positive stream refrigerant tubing of third heat exchanger (6), exports low with evaporator (7)
Compression refrigerant conduit entrance is connected；The low pressure refrigerant pipe outlet of the evaporator (7) and the system of backflowing of third heat exchanger (6)
Cryogen conduit entrance is connected；The system of backflowing of the refrigerant tubing outlet and the second heat exchanger (5) of backflowing of the third heat exchanger (6)
Cryogen conduit entrance is connected；The system of backflowing of the refrigerant tubing outlet and First Heat Exchanger (4) of backflowing of second heat exchanger (5)
Cryogen conduit entrance is connected；The capital heat exchange of backflow the refrigerant tubing outlet and rectifier unit (3) of the First Heat Exchanger (4)
The import of device cooling pipe is connected；The outlet in capital heat exchanger cooling pipe road is connected with the air entry of compressor (1)；
The outlet at bottom of the rectifier unit is connected with the kettle base solution conduit entrance of the 4th heat exchanger (12)；4th heat exchanger
(12) kettle base solution pipe outlet is connected with the kettle base solution conduit entrance of the 5th heat exchanger (13)；5th heat exchanger (13)
Kettle base solution pipe outlet is connected with the kettle base solution conduit entrance of the 6th heat exchanger (14)；The kettle base solution of 6th heat exchanger (14)
Pipe outlet is connected with the kettle base solution conduit entrance of the 7th heat exchanger (15)；
The outlet at bottom of the capital heat exchanger of the rectifier unit is connected with the reflux pipeline import of the 4th heat exchanger (12)；
The reflux pipeline outlet of 4th heat exchanger (12) is connected with the reflux pipeline import of the 5th heat exchanger (13)；Described
The reflux pipeline outlet of five heat exchangers (13) is connected with the reflux pipeline import of the 6th heat exchanger (14)；6th heat exchange
The reflux pipeline outlet of device (14) is connected with the reflux pipeline import of the 7th heat exchanger (15)；
Kettle base solution pipe outlet and the reflux pipeline outlet of 7th heat exchanger (15) pass through three articles of bypass line difference
It is connected with the import of the refrigerant tubing that backflows of First Heat Exchanger (4), the second heat exchanger (5), third heat exchanger (6)；Described
A restricting element is equipped in bypass line；
The oil-gas pipeline outlet of the First Heat Exchanger (4) is connected with the import of the first separator (8)；First separator
(8) gaseous phase outlet is connected with the oil-gas pipeline import of the second heat exchanger (5)；The Oil/Gas Pipe of second heat exchanger (5) is said
Mouth is connected with the import of the second separator (9)；The gaseous phase outlet of second separator (9) and the oil gas of third heat exchanger (6)
Conduit entrance is connected；The oil-gas pipeline outlet of the third heat exchanger (6) is connected with the import of third separator (10)；Described
The gaseous phase outlet of three separators (10) is connected with the oil-gas pipeline import of evaporator (7)；The Oil/Gas Pipe of the evaporator (7) is said
Mouth is connected with the import of the 4th separator (11)；The gaseous phase outlet of 4th separator (11) and the tail of third heat exchanger (6)
Feed channel import is connected；The exhaust pipe import phase of the exhaust pipe outlet and the second heat exchanger (5) of the third heat exchanger (6)
Even；The exhaust pipe outlet of second heat exchanger (5) is connected with the exhaust pipe import of First Heat Exchanger (4)；
The liquid-phase outlet of first separator (8) is connected with the first cold oil conduit entrance of the 4th heat exchanger (12)；It is described
The liquid-phase outlet of second separator (9) is connected with the first cold oil conduit entrance of the 5th heat exchanger (13)；5th heat exchange
First cold oil pipe outlet of device (13) is connected with the second cold oil conduit entrance of the 4th heat exchanger (12)；The third point
Liquid-phase outlet from device (10) is connected with the first cold oil conduit entrance of the 6th heat exchanger (14)；6th heat exchanger (14)
The first cold oil pipe outlet be connected with the second cold oil conduit entrance of the 5th heat exchanger (13)；5th heat exchanger
(13) the second cold oil pipe outlet is connected with the third cold oil conduit entrance of the 4th heat exchanger (12)；4th separation
The liquid-phase outlet of device (11) is connected with the first cold oil conduit entrance of the 7th heat exchanger (15)；7th heat exchanger (15)
First cold oil pipe outlet is connected with the second cold oil conduit entrance of the 6th heat exchanger (14)；6th heat exchanger (14)
The second cold oil pipe outlet be connected with the third cold oil conduit entrance of the 5th heat exchanger (13)；5th heat exchanger
(13) third cold oil pipe outlet is connected with the 4th cold oil conduit entrance of the 4th heat exchanger (12).
2. rectification type Auto-cascade cycle low-temperature condensing vapour separation system as described in claim 1, which is characterized in that the rectifying
The outlet at bottom of device (3) is sequentially connected device for drying and filtering (23) and bottom heat exchanger (24) first, then with the 4th heat exchanger
(12) kettle base solution conduit entrance is connected；High-pressure refrigerant pipeline and low pressure refrigerant are equipped in the bottom heat exchanger (24)
Pipeline；Device for drying and filtering (23) import is connected with rectifier unit (3) outlet at bottom, outlet and bottom heat exchanger (24)
High-pressure refrigerant conduit entrance is connected；The high-pressure refrigerant pipe outlet and the 4th heat exchanger (12) of the bottom heat exchanger (24)
Kettle base solution conduit entrance be connected；The low pressure refrigerant conduit entrance of the bottom heat exchanger (24) and the column of rectifier unit (3)
It pushes up heat exchanger exit to be connected, outlet is connected with compressor (1) air entry.
3. rectification type Auto-cascade cycle low-temperature condensing vapour separation system as claimed in claim 2, which is characterized in that the oil gas
It condenses and separates and cold recovery circuit further includes the 4th heat exchanger unit；4th heat exchanger unit includes the 8th heat exchanger
(26), the 9th heat exchanger (29), the first shut-off valve (25), the second shut-off valve (27), third shut-off valve (28), the 4th shut-off valve
(30), the 5th shut-off valve (31), the 6th shut-off valve (32), the 7th shut-off valve (33), the 8th shut-off valve (34)；8th heat exchange
Device (26) and the 9th heat exchanger (29) are arranged in parallel；
There are an oil-gas pipeline and an exhaust pipe inside 8th heat exchanger (26) and the 9th heat exchanger (29)；Institute
The exhaust pipe outlet for stating First Heat Exchanger (4) is connected with the 5th shut-off valve (31) and the 7th shut-off valve (33) import respectively；Institute
The oil-gas pipeline import for stating the 8th heat exchanger (26) is connected with the outlet of the first shut-off valve (25), and oil-gas pipeline exports and second section
Only the import of valve (27) is connected, and exhaust pipe import is connected with the outlet of the 5th shut-off valve (31), exhaust pipe outlet and the 6th
The import of shut-off valve (32) is connected；
The oil-gas pipeline import of 9th heat exchanger (29) is connected with the outlet of third shut-off valve (28), oil-gas pipeline outlet
It is connected with the import of the 4th shut-off valve (30), exhaust pipe import is connected with the outlet of the 7th shut-off valve (33), and offgas duct is said
Mouth is connected with the import of the 8th shut-off valve (34)；The outlet of second shut-off valve (27) and the outlet phase of the 4th shut-off valve (30)
Even, it is connected after pooling a pipeline with the oil-gas pipeline import of First Heat Exchanger (4)；The outlet of 6th shut-off valve (32)
It is connected with the outlet of the 8th shut-off valve (34), pools the outlet after a pipeline as tail gas.
4. rectification type Auto-cascade cycle low-temperature condensing vapour separation system as described in claim 1, which is characterized in that the rectifying
The first Variable Composition circuit and the second Variable Composition circuit in parallel are equipped between device (3) and compressor (1) air entry；First thickens
Spending circuit includes the 9th shut-off valve (35), fluid reservoir (36) and the tenth shut-off valve (37) being sequentially connected in series；Second Variable Composition circuit
Including the 11st shut-off valve (38), the first air accumulator (39) and the 12nd shut-off valve (40) being sequentially connected in series；9th cut-off
The import of valve (35) is connected with the outlet at bottom of rectifier unit (3), the import of the 11st shut-off valve (38) and rectifier unit
(3) capital heat exchanger top exit is connected, the outlet of the tenth shut-off valve (37) and the outlet of the 12nd shut-off valve (40)
It is connected with compressor (1) air entry.
5. rectification type Auto-cascade cycle low-temperature condensing vapour separation system as claimed in claim 4, which is characterized in that the first segment
The positive stream refrigerant tubing of the import of fluid element (16) and the third heat exchanger (6) is equipped with the 5th separator between outlet
(44)；Third Variable Composition circuit is equipped between 5th separator (44) and the air entry of compressor (1)；The third
Variable Composition circuit includes the 13rd shut-off valve (41), the second air accumulator (42) and the 14th shut-off valve (43) being sequentially connected in series, the
The import of 13 shut-off valves (41) is connected with the gaseous phase outlet of the 5th separator (40).
6. the rectification type Auto-cascade cycle low-temperature condensing vapour separation system as described in claim 3~5 any claim, feature
It is, the condenser (2), First Heat Exchanger (4), the second heat exchanger (5), third heat exchanger (6), evaporator (7), the 4th
Heat exchanger (12), the 5th heat exchanger (13), the 6th heat exchanger (14), the 7th heat exchanger (15), bottom heat exchanger (24), the 8th change
Hot device (26) and the 9th heat exchanger (29) are double pipe heat exchanger, spray-type heat exchanger, shell and tube exchanger or plate fin heat-exchanging
Device.
7. the rectification type Auto-cascade cycle low-temperature condensing vapour separation system as described in Claims 1 to 5 any claim, feature
It is, the refrigerant used in the system is non-azeotropic mixed working medium more than binary or binary.
8. the rectification type Auto-cascade cycle low-temperature condensing vapour separation system as described in Claims 1 to 5 any claim, feature
It is, each restricting element is manual throttle valve, automatic throttle or capillary.
9. the rectification type Auto-cascade cycle low-temperature condensing vapour separation system as described in Claims 1 to 5 any claim, feature
It is, the rectifying column in the rectifier unit is material filling type or column plate type.
10. the rectification type Auto-cascade cycle low-temperature condensing vapour separation system as described in claim 3~5 any claim, special
Sign is that each shut-off valve is two-way shut-off valve manually or automatically.
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| CN108061403A (en) * | 2017-08-28 | 2018-05-22 | 浙江大学 | A kind of two-way self-cascade heat pump system |
| CN108061400B (en) * | 2017-08-28 | 2021-05-14 | 浙江大学 | Switchable bidirectional mixed working medium heat pump system |
| CN108072202A (en) * | 2017-08-28 | 2018-05-25 | 浙江大学 | A kind of bridge-type two-way Auto-cascade cycle system of heat pump |
| CN108061404A (en) * | 2017-08-28 | 2018-05-22 | 浙江大学 | A kind of two-way mixed working fluid heat pump system |
| CN110193212A (en) * | 2019-05-14 | 2019-09-03 | 绍兴西爱西尔数控科技有限公司 | A kind of rectifier unit of refrigerant point oil |
| CN111575044B (en) * | 2020-06-11 | 2021-10-22 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Indirect oil gas condensation recovery device and recovery process thereof |
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| CN101275798A (en) * | 2007-12-27 | 2008-10-01 | 浙江大学 | Rectification type mixed working substance self-stacking gas liquefaction system |
| CN101874937A (en) * | 2009-12-24 | 2010-11-03 | 清华大学 | Oil gas recovery method |
| CN102147162B (en) * | 2011-03-16 | 2012-06-27 | 浙江大学 | Rectifying type variation-concentration self-overlaying gas liquefaction system |
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