CN106823440B - A kind of oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation - Google Patents
A kind of oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation Download PDFInfo
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- CN106823440B CN106823440B CN201710056480.7A CN201710056480A CN106823440B CN 106823440 B CN106823440 B CN 106823440B CN 201710056480 A CN201710056480 A CN 201710056480A CN 106823440 B CN106823440 B CN 106823440B
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- 238000009833 condensation Methods 0.000 title claims abstract description 32
- 230000005494 condensation Effects 0.000 title claims abstract description 32
- 239000003507 refrigerant Substances 0.000 claims abstract description 162
- 238000000926 separation method Methods 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims description 182
- 230000008676 import Effects 0.000 claims description 169
- 239000000203 mixture Substances 0.000 claims description 65
- 238000001816 cooling Methods 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 21
- 239000007792 gaseous phase Substances 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 11
- 239000012071 phase Substances 0.000 claims description 6
- 238000004821 distillation Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 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 33
- 238000000034 method Methods 0.000 description 18
- 238000005057 refrigeration Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 13
- 150000002430 hydrocarbons Chemical class 0.000 description 12
- 229930195733 hydrocarbon Natural products 0.000 description 11
- 239000007791 liquid phase Substances 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000004215 Carbon black (E152) Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000010257 thawing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000013461 design 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
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 235000013847 iso-butane Nutrition 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
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011176 pooling Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N sec-butylidene Natural products CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 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)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a kind of oil and gas separating systems of rectification type Auto-cascade cycle cryogenic condensation, including compressor, condenser, rectifier unit, heat exchanger and oil gas condensation separating circuit；Oil gas condensation separating circuit includes First Heat Exchanger unit, the second heat exchanger unit, the first throttle element and separator unit being set between First Heat Exchanger unit and the second heat exchanger 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, decompression enters water equivalent variation in the temperature-fall period of Optimized Matching heterogeneity oil gas in First Heat Exchanger unit respectively, have many advantages, such as that structure is simple, reliable for operation and system effectiveness is high, 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 Oil-gas Separations of rectification type Auto-cascade cycle cryogenic condensation
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 right
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 is total in the oil gas of equal clear stipulaties discharge
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.To build low-temperature condensing vapour, i.e., initial people generally use cascade refrigeration circulation
Different refrigerants are used to operate in the hydrocarbon component for obtaining different temperature levels in multiple refrigeration cycle to condense different boiling.But
Equipment needed for cascade refrigeration system is more, is gradually mixed chiller refrigeration circulation and substitutes.In general, mix refrigerant Oil-gas Separation
System uses the thought of self-cascade refrigeration system, uses multi-stage separation in the circulation of refrigerant, so as to high low-boiling system
Cryogen separation is more complete；Meanwhile the oil lubricating compressor that general middle-size and small-size system is common because cost consideration will use, multistage point
It is condensed out from the lubricating oil that can take refrigerant out of, avoids it from entering low-temperature zone and block throttling set.But separate the increasing of grade
Lead to system more structure is complicated to change, off design performance is deteriorated.Especially for the oil and gas separating system of small-sized, miniature scale,
Structure is simply extremely important.
Chinese patent ZL02110664.9 proposes a kind of rectification type mix refrigerant deep refrigerating device, using a rectifying
Device substitutes multiple gas-liquid separators, and high low boiling point refrigerant and cold is separated in conventional hybrid chiller refrigeration device to realize
The purpose of solidifying compressor lubricant oil, reduces the complexity of system, it may have higher efficiency.But the device is attainable
Cryogenic temperature be not it is very low, apparatus structure is more complicated.
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 does not need to be liquefied, so the device is not suitable for Oil-gas Separation field.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of Oil-gas Separations of rectification type Auto-cascade cycle cryogenic condensation
System, the system structure is simple, reliable for operation, can complete the hydrocarbon group in separation tail gas with a common oil lubricating compressor
Point, so that emissions concentration is met national standard, is particularly suitable for the volatile oil and gas in places such as oil depot, gas station, petrochemical factory
Processing.
Technical scheme is as follows:
A kind of oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation, including compressor, condenser, rectifier unit, with
And oil gas condensation separating circuit；The compressor outlet is connected with condenser inlet；The condensator outlet and rectifying fills
Import is set to be connected；The rectifier unit include rectifying column and with the capital heat exchanger that is connected at the top of rectifying column, capital exchanges heat
Device top exit is connected with oil gas condensation separating circuit, and the oil gas condensation separating circuit includes First Heat Exchanger unit,
Two heat exchanger units, first throttle element and separator unit；The First Heat Exchanger unit includes First Heat Exchanger, second
The combination of one of heat exchanger and third heat exchanger or a few persons；The first throttle element is set to First Heat Exchanger unit
And second between heat exchanger unit；Second heat exchanger unit includes evaporator；The separator unit includes first
The combination of one of separator, the second separator, third separator and the 4th separator or a few persons；
The First Heat Exchanger, the second heat exchanger are equipped with a positive stream refrigerant tubing, one in third heat exchanger
Backflow refrigerant tubing, an oil-gas pipeline and an exhaust pipe；Be equipped in the evaporator refrigerant tubing and
One oil-gas pipeline；Cooling pipe is equipped in the capital heat exchanger of the rectifier unit；First separator, second point
Gaseous phase outlet and liquid-phase outlet are equipped with from device, third separator and the 4th separator；
The positive stream refrigerant tubing import of capital heat exchanger top exit with the First Heat Exchanger is connected；Described
The positive stream refrigerant tubing outlet of one heat exchanger is connected with the positive stream refrigerant tubing import of the second heat exchanger；Described second is changed
The positive stream refrigerant tubing outlet of hot device is connected with the positive stream refrigerant tubing import of third heat exchanger；The third heat exchanger
Positive stream refrigerant tubing outlet be connected with the import of first throttle element, the outlet of first throttle element and the refrigeration of evaporator
Agent conduit entrance is connected；The refrigerant tubing import phase of backflowing of the refrigerant tubing outlet and third heat exchanger of the evaporator
Even；The refrigerant tubing outlet of backflowing of the third heat exchanger is connected with the refrigerant tubing import of backflowing of the second heat exchanger；
The refrigerant tubing outlet of backflowing of second heat exchanger is connected with the refrigerant tubing import of backflowing of First Heat Exchanger；It is described
First Heat Exchanger backflow refrigerant tubing outlet be connected with the import in the capital heat exchanger cooling pipe road of rectifier unit；It is described
The outlet in capital heat exchanger cooling pipe road be connected to the air entry of compressor；
The oil-gas pipeline outlet of the First Heat Exchanger is connected with the import of the first separator；First separator
Gaseous phase outlet be connected with the oil-gas pipeline import of the second heat exchanger；The oil-gas pipeline outlet and second of second heat exchanger
The import of separator is connected；The gaseous phase outlet of second separator is connected with the oil-gas pipeline import of third heat exchanger；Institute
The oil-gas pipeline outlet for the third heat exchanger stated is connected with the import of third separator；The gaseous phase outlet of the third separator
It is connected with the oil-gas pipeline import of evaporator；The oil-gas pipeline outlet of the evaporator is connected with the import of the 4th separator；
The gaseous phase outlet of 4th separator is connected with the exhaust pipe import of third heat exchanger；The tail of the third heat exchanger
Feed channel outlet is connected with the exhaust pipe import of the second heat exchanger；The exhaust pipe outlet and first of second heat exchanger
The exhaust pipe import of heat exchanger is connected；
The outlet at bottom of the rectifier unit is changed with First Heat Exchanger, the second heat exchanger and third respectively by three branches
The import of the refrigerant tubing that backflows of hot device is connected；Three branch road is respectively equipped with a restricting element；
The outlet at bottom of the capital heat exchanger by three bypass lines respectively with First Heat Exchanger, the second heat exchanger and
The import of the refrigerant tubing that backflows of third heat exchanger is connected, and a throttling member is respectively equipped in three bypass lines
Part.
In above-mentioned oil gas condensation treatment loop, oil gas enters condensation point from the oil-gas pipeline import of First Heat Exchanger first
From circuit, the oil-gas pipeline outlet of First Heat Exchanger is connected with the import of the first separator, by the gas-liquid point of the first separator
From process, the gaseous phase outlet of the first separator is connected with the second heat exchanger oil-gas pipeline import, the oil-gas pipeline of the second heat exchanger
Outlet 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
It is connected with third heat exchanger oil-gas pipeline import；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, which enters third through the gaseous phase outlet of the 4th separator and change
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, and second
The outlet of heat exchanger exhaust pipe is connected with First Heat Exchanger exhaust pipe import, and final satisfactory tail gas is through First Heat Exchanger
Exhaust pipe outlet drain.
Liquid-phase outlet, the second separator by the cold oil liquid that gradually condenses and separate through the first separator
The liquid-phase outlet discharge of liquid-phase outlet, the liquid-phase outlet of third separator, the 4th separator, is recycled to storage tank or with its other party
Formula is stored and is utilized.
First Heat Exchanger unit is not limited to be made of three heat exchangers in above-mentioned technical proposal, can be according to practical feelings
Condition adjusts the number of heat exchanger in First Heat Exchanger unit.With the adjustment of number of heat exchangers in First Heat Exchanger unit, separation
The number of device unit inner separator should adjust accordingly, and rectifier unit outlet at bottom and capital exchanger base export connection
Bypass line number and the restricting element number of branch road should also adjust accordingly.
Oil gas to be treated is successively passed through in the heat exchanger unit in oil vapor treatment circuit by above-mentioned technical proposal, by backflowing
Low pressure refrigerant main cooling capacity is provided, and the characteristics of according to oil gas ingredient to be processed, using rectifier unit bottom and
The highly pressurised liquid of top heterogeneity mixes after throttling respectively with low pressure refrigerant, to optimize and match in oil gas temperature-fall period
Water equivalent variation, cools down oil gas paragraph by paragraph, reduces the heat transfer temperature difference in different temperature zones heat exchanger between mix refrigerant and oil gas,
To adapt to the condensation separation of heterogeneity oil gas and reduce the unit wasted work of system.The oil gas cooled down step by step passes through multiple gas
Liquid separation, ultimately forms the low temperature exhaust gas for meeting concentration of emission requirement, can provide a part of cooling capacity again, discharge after rewarming；It is cold
Solidifying oil liquid body can there are many storage or Land use systems.
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 can be set on the outlet at bottom pipeline of the rectifier unit, realized to bottom
The drying and filtering of trickle refrigerant；One or more bottom heat exchangers can also be set simultaneously, to the system of bottom outflow
Cryogen carries out precooling treatment.
When device for drying and filtering and bottom heat exchanger number are one, the outlet at bottom of the rectifier unit first according to
Then secondary connection device for drying and filtering and bottom heat exchanger are connected with three branches again；It is set in the bottom heat exchanger
There are bottom heat exchanger high-voltage refrigerant tubing and bottom heat exchanger low pressure refrigerant pipeline；The device for drying and filtering import and essence
Distillation unit outlet at bottom is connected, and outlet is connected with bottom heat exchanger high-voltage refrigerant tubing import；The bottom heat exchanger is high
Compression refrigerant pipe outlet is connected with the restricting element import of branch road respectively again；The bottom heat exchanger low pressure refrigerant pipe
Road import is connected with rectifier unit capital heat exchanger exit, and outlet is connected with the air entry of compressor.
It is pre-chilled using liquid refrigerant of the low pressure refrigerant to rectifier unit bottom, realizes the comprehensive utilization of energy；
The import of high-pressure refrigerant pipeline and low pressure refrigerant pipeline in the bottom heat exchanger is located at bottom heat exchanger
Two sides, 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 third heat exchanger unit,
So that oil gas to be processed is cooled to -1 DEG C~4 DEG C to eliminate steam substantially.
The third heat exchanger unit include the 4th heat exchanger, the 5th 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 and the 8th shut-off valve；Described the 4th
Heat exchanger and the 5th heat exchanger are arranged in parallel.
An oil-gas pipeline and an exhaust pipe are equipped with inside 4th heat exchanger and the 5th heat exchanger；Oil gas
It bifurcates and is connected respectively with the first shut-off valve and third shut-off valve import first；The exhaust pipe of First Heat Exchanger exports difference
It is connected with the 5th shut-off valve and the 7th shut-off valve import, so that tail gas is divided into two branches；The oil gas of 4th heat exchanger
Conduit entrance with first cut-off valve outlet be connected, oil-gas pipeline outlet is connected with the second shut-off valve import, exhaust pipe import with
5th cut-off valve outlet is connected, and exhaust pipe outlet is connected with the 6th shut-off valve import；
The oil-gas pipeline import of 5th heat exchanger is connected with third cut-off valve outlet, oil-gas pipeline outlet and the 4th
Shut-off valve import is connected, and exhaust pipe import is connected with the 7th cut-off valve outlet, exhaust pipe outlet and the 8th shut-off valve import
It is connected；The described second cut-off valve outlet and the 4th cut-off valve outlet are connected, pool after a pipeline with First Heat Exchanger
Oil-gas pipeline import is connected；The 6th cut-off valve outlet and the 8th cut-off valve outlet is connected, and makees after pooling a pipeline
For the outlet of tail gas.4th heat exchanger, the 5th heat exchanger and with each shut-off valve for being respectively connected together switchover operation.
The import of the oil-gas pipeline and exhaust pipe of 4th heat exchanger and the 5th heat exchanger is respectively positioned on respective heat exchange
The two sides of device, to realize counterflow heat exchange.In third 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 condenses, the comprehensive utilization of energy is realized；And using the mode of two heat exchangers switchover operation, make
When one heat exchanger operation, 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, the tenth shut-off valve being sequentially connected in series, and the second Variable Composition returns
The 11st shut-off valve, the first air accumulator, the 12nd shut-off valve being sequentially connected in series is routed to constitute；In the preferred technical solution,
The import of 9th shut-off valve is connected with the outlet at bottom of rectifier unit, the import of the 11st shut-off valve and rectifier unit
Capital heat exchanger top exit be connected；Tenth shut-off valve outlet and the 12nd shut-off valve outlet with compression
The air entry of machine is connected.
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 preferred technical solution for further convenient for the content for adjusting low boiling point refrigerant in refrigerant circuit
Is arranged on pipeline between the import of the first throttle element and the high-pressure refrigerant pipe outlet of third heat exchanger
Five separators；Third Variable Composition circuit is set between the 5th separator and the air entry of compressor；The third becomes
Concentration circuit is made of the 13rd shut-off valve, the second air accumulator and the 14th shut-off valve being sequentially connected in series, the 13rd cut-off
Valve import is connected to the gaseous phase outlet of the 5th separator.
The capital heat exchanger of the condenser, rectifier unit, the second heat exchanger, third heat exchanger, steams First Heat Exchanger
Common double pipe heat exchanger, spray-type heat exchanger, shell can be selected in hair device, bottom heat exchanger, the 4th heat exchanger, the 5th heat exchanger
Pipe heat exchanger or plate-fin heat exchanger.The pipeline connected according to actual needs and specific occasion select different types of heat exchange
Device.Preferred plate-fin heat exchanger in the present invention.
Refrigerant used in the low-temperature condensing vapour separation system is that the non-azeotrope of binary or binary or more mixes system
Cryogen, common component mainly have: nitrogen, inert gas, hydro carbons, the halide of hydrocarbon, carbon dioxide etc..
Conventional manual throttle valve, automatic throttle or capillary can be selected in each restricting element, to play throttling
The effect of cooling.
Common manually or automatically two-way shut-off valve can be selected in each shut-off valve, to realize the automatic or hand of shut-off valve
Dynamic control, wherein first and second shut-off valve links, and third and the 4th shut-off valve link, the linkage of the 5th and the 6th shut-off valve, the
The linkage of seven and the 8th shut-off valve.
Conventional packed tower or plate column can be selected in the rectifier unit.
Compared with prior art, the invention has the benefit that
(1) structure of refrigeration system simplifies in oil and gas separating system of the invention, reliable for operation.For containing low boiling point component
More oil gas, required lowest refrigerating temperature is lower, and such as -110 DEG C -- 130 DEG C.Reach so low cryogenic temperature, tradition
Mix refrigerant auto-cascading refrigeration system generally require 2-5 grades of separation processes.Multi-stage separation mistake is substituted using rectifier unit
Journey can be such that system structure greatly simplifies, and to enter the lubricating oil carried in the refrigerant of low-temperature zone and effectively remove,
The reliability service of guarantee system.
(2) thermodynamic efficiency of oil gas condensation system can be improved in oil and gas separating system of the invention.For heterogeneity
Oil gas, according in its temperature-fall period water equivalent characteristic distributions and flow it is different, two, adjustable rectifier unit bottom, top
The flow and hybrid position of the high pressure mixing refrigerant liquid for the heterogeneity that place is drawn optimize the temperature point in heat exchanger
Cloth reduces heat transfer temperature difference, to improve the thermodynamic efficiency of system, reduces system wasted work.
(3) oil and gas separating system of the invention makes full use of the waste cold of tail gas.If water content is more in oil gas or is carrying out
It is not dried excessively before condensation process, then oil gas is pre-chilled in the waste cold that can use in tail gas, so that most of water cooling
It coagulates, reduce the subsequent low-temperature zone frosting a possibility that.Precool heat exchanger device unit is increased by the way of switchover operation simultaneously
The continuous operation stability of device.
(4) oil and gas separating system of the invention can optimize the beginning temperature-fall period of oil and gas separating system, improve rate of temperature fall.
Start in temperature-fall period, the increase of high boiling component concentration can reduce the booting pressure of system in mix refrigerant, improve the stage
Inner compressor excessive discharge temperature and pressure ratio problem bigger than normal, improve the dynamic operational behaviour of system.
(5) oil and gas separating system of the invention can optimize the final temperature-fall period of oil and gas separating system, so that system reaches
Lower cryogenic temperature improves the thermodynamic efficiency of system.In the terminal stage that cools down, low boiling component concentration in mix refrigerant
Increase the water equivalent matching that can improve high and low pressure side mix refrigerant in heat exchanger, to reduce the attainable lowest temperature of system
Degree, improves the thermodynamic property of system.
(6) three equal structures in Variable Composition circuit are simple in oil and gas separating system of the invention, and regulating power is strong, operation side
Just.In system design, several Variable Composition circuits can be set according to the lowest refrigerating temperature of required realization, it can also be with
Several Variable Composition circuits are enabled as needed in system operation.
Detailed description of the invention
Fig. 1 is that the structure of the first embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the invention is shown
It is intended to；
Fig. 2 is that the structure of second of embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the invention is shown
It is intended to；
Fig. 3 is that the structure of the third embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the invention is shown
It is intended to；
Fig. 4 is that the structure of the 4th kind of embodiment of rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the invention is shown
It is intended to；
Fig. 5 is the 5th kind of embodiment of Variable Composition rectification type Auto-cascade cycle low-temperature condensing vapour separation system of the invention
Structural schematic diagram.
Specific embodiment
With reference to the accompanying drawings and detailed description to a kind of Oil-gas Separation of rectification type Auto-cascade cycle cryogenic condensation of the present invention
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, including compressor 1, condenser 2, essence
Distillation unit 3, First Heat Exchanger 4, the second heat exchanger 5, third heat exchanger 6, evaporator 7, the first separator 8, the second separator 9,
Third separator 10, the 4th separator 11, first throttle element 12, the second restricting element 13, third restricting element 14, Section four
Fluid element 15, the 5th restricting element 16, the 6th restricting element 17 and the 7th restricting element 18.
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.First Heat Exchanger 4, the second heat exchanger 5 are equipped with a positive stream refrigerant tubing, one in third heat exchanger 6
Backflow refrigerant tubing, an oil-gas pipeline and an exhaust pipe, is equipped with the import or export being connected to pipeline on outer wall.
A refrigerant tubing and an oil-gas pipeline are equipped in evaporator 7, outer wall is equipped with the import or export being connected to pipeline.
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, and the rectifying column bottom liquid outlet 3b of rectifier unit 3 throttles with second respectively
The import 13a of element 13, the import 14a of third restricting element 14, the import 15a of the 4th restricting element 15 are connected.
The positive stream refrigerant tubing import 4a of outlet 3c and First Heat Exchanger 4 at the top of the capital heat exchanger of rectifier unit 3
It is connected；The outlet 3f of the capital exchanger base of rectifier unit 3 and respectively with the import 16a of the 5th restricting element 16, Section six
The import 17a of fluid element 17, the import 18a of the 7th restricting element 18 are 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 outlet 4d then import with the cooling pipe in 3 capital heat exchanger of rectifier unit of backflowing of First Heat Exchanger 4
3d is connected；Oil-gas pipeline import to be processed in First Heat Exchanger 4 is 4g, and exhaust pipe outlet is 4f；In First Heat Exchanger 4
Oil-gas pipeline outlet 4h is connected with the import 8a of the first separator 8, the exhaust pipe of exhaust pipe import 4e and the second heat exchanger 5
5f is exported to be connected.Positive stream refrigerant tubing import 4a, the refrigerant tubing that backflows in First Heat Exchanger 4 export 4d, exhaust pipe
4f, oil-gas pipeline import 4g are exported in the same side, and the positive stream refrigerant tubing in First Heat Exchanger 4 exports 4b, refrigeration of backflowing
Agent conduit entrance 4c, exhaust pipe import 4e, oil-gas pipeline outlet 4h are 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 outlet 6d phase of backflowing of backflow refrigerant tubing import 5c and the third heat exchanger 6 of the second heat exchanger 5
Even；The exhaust pipe import 5e of second heat exchanger 5 is connected with the exhaust pipe of third heat exchanger 6 outlet 6f, oil-gas pipeline import
5g is connected with the gaseous phase outlet 8c of the first separator 8, and oil-gas pipeline outlet 5h is connected with the import 9a of the second separator 9.Second
Positive stream refrigerant tubing import 5a in heat exchanger 5, the refrigerant tubing that backflows outlet 5d, exhaust pipe outlet 5f, oil-gas pipeline into
Mouthful 5g is in the same side, and the positive stream refrigerant tubing of the second heat exchanger 5 outlet 5b, backflow refrigerant tubing import 5c, offgas duct
Road import 5e, oil-gas pipeline outlet 5h are in the other 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 11a of first throttle element 11, first segment
The outlet 11b of fluid element 11 is then connected with the refrigerant tubing import 7a of evaporator 7；The refrigerant pipe that backflows of third heat exchanger 6
Import 6c in road is connected with the refrigerant tubing of evaporator 7 outlet 7b；The exhaust pipe import 6e of third heat exchanger 6 is separated with the 4th
The gaseous phase outlet 11c of device 11 is connected, and oil-gas pipeline import 6g is connected with the gaseous phase outlet 9c of the second separator 9, and Oil/Gas Pipe is said
Mouth 6h is connected with the import 10a of third separator 10.Positive stream refrigerant tubing import 6a in third heat exchanger 6, backflow refrigerant
Pipe outlet 6d, exhaust pipe outlet 6f, oil-gas pipeline import 6g are in the same side, and positive stream refrigerant pipe in third heat exchanger 6
Road exports 6b, the refrigerant tubing import 6c that backflows, exhaust pipe import 6e, oil-gas pipeline outlet 6h in the other side, cold to realize
The reverse heat-exchange of hot fluid.
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；Refrigerant tubing outlet 7b and exhaust pipe import 7c in evaporator 7 is same
Side, refrigerant tubing import 7a and exhaust pipe outlet 7d are in the other side, to realize the reverse heat-exchange of cold fluid and hot fluid.
The liquid-phase outlet 8b of first separator 8, the liquid-phase outlet 9b of the second separator 9, third separator 10 liquid phase go out
The liquid-phase outlet 11b of mouth 10b and the 4th separator 11 finally pools one, and storage is collected or sent back to as cold oil
Tank.
Second restricting element 13 outlet 13b, the 5th restricting element 6 outlet 16b with the system of backflowing of First Heat Exchanger 4
Cryogen conduit entrance 4c is connected, or is connected with the refrigerant tubing outlet 5d that backflows of the second heat exchanger 5；Third restricting element 14
Outlet 14b, the 6th restricting element 17 outlet 17b be connected with the refrigerant tubing import 5c that backflows of the second heat exchanger 5, or with
The refrigerant tubing outlet 6d that backflows of third heat exchanger 6 is connected；4th restricting element outlet 15b, the 7th restricting element go out
Mouth 18b is connected with the refrigerant tubing import 6c that backflows of third heat exchanger 6, or exports 7b with the refrigerant tubing of evaporator 7
It 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 are plate-fin heat exchanger.
First throttle element 12, the second restricting element 13, third restricting element 14, the throttling of the 4th restricting element the 15, the 5th
Conventional manual throttle valve, automatic throttle or capillary can be selected in element 16, the 6th restricting element 17, the 7th restricting element 18
Pipe, to play the role of throttling cooling.Rectifier unit 3 is similar with the rectifier unit in common refrigerating plant, and rectifying column can select
With conventional column plate type rectifying column or material filling type rectifying column.Connection between all parts is connected using refrigerant line, low
Waterproof and thermal insulation material are wrapped up outside warm pipeline.Refrigerant used in low-temperature condensing vapour separation system is binary or binary or more
Mixed non-azeotropic refrigerant, common component mainly has: nitrogen, inert gas, hydro carbons, the halide of hydrocarbon, carbon dioxide etc.
Deng.
For ease of understanding, above-mentioned rectification type Auto-cascade cycle low-temperature condensing vapour separation system can be divided into refrigerant circuit and oil
Air circuit is 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, the process of heat and mass is carried out with the phegma that flows down at the top of rectifier unit 3；Higher boiling in mix refrigerant
Component, compressor lubricant oil and a small amount of low boiling component are condensed a part as phegma；Most of low boiling
The gaseous state mix refrigerant that point component is constituted is flowed out by 3 top heat exchanger of rectifier unit from top exit 3c.This strand of gaseous state is mixed
It closes refrigerant and passes sequentially through First Heat Exchanger 4, the second heat exchanger 5, third heat exchanger 6, throttle and drop by first throttle element 12
Temperature, subsequently into evaporator 7 provide cooling capacity, then successively backflow by third heat exchanger 6, the second heat exchanger 5, First Heat Exchanger 4,
The capital heat exchanger of rectifier unit 3, respectively oil gas and distillation process provide cooling capacity, finally return that the air entry of compressor 1.
Liquid refrigerant based on high boiling component is flowed out from the bottom 3b of rectifier unit 3, can respectively enter second
Restricting element 13, third restricting element 14, the 4th restricting element 15, the refrigerant that backflows after throttling and based on low boiling point
It is mixed in different positions.The aperture for adjusting the second restricting element 13 or third restricting element 14 or the 4th restricting element 15, can
So that this strand of liquid refrigerant and the refrigerant that backflows mix in different proportions, to match the water equivalent in heat exchanger.
Liquid refrigerant based on intermediate boiling component is flowed from the outlet at bottom 3f of the capital heat exchanger of rectifier unit 3
Out, the 5th restricting element 16, the 6th restricting element 17, the 8th restricting element 18 can be respectively enterd, after throttling and with low
The refrigerant that backflows based on boiling point is mixed in different positions.Adjust the 5th restricting element 16 or the 6th restricting element 17 or the 7th
The aperture of restricting element 18, can make this strand of liquid refrigerant and the refrigerant that backflows mixes in different proportions, be changed with matching
Water equivalent in hot device.
In oil gas circuit, high temperature or room temperature oil gas first pass around the cooling of First Heat Exchanger 4, will into the first separator 8
The oil product that partial liquefaction gets off is separated；Not liquefied oil gas goes successively to the second heat exchanger 5 and is cooled to lower temperature,
Into the second separator 9, the oil product of partial liquefaction again is separated；Not liquefied oil gas is further continued for entering third heat exchanger
6 continue to cool down, and into third separator 10, the oil product of partial liquefaction again is separated；Finally, not liquefied oil gas enters
Evaporator 7 cools down, and into the 4th separator 11, liquefied oil product is separated.By the adjusting of system parameters, Ke Yibao
Not liquefied oil gas has had reached the discharge standard in national standard to card at this time.It, will for the cooling capacity for utilizing the non-blau gas in this part
It successively backflows through third heat exchanger 6, the second heat exchanger 5, First Heat Exchanger 4, is discharged in the form of tail gas after rewarming.First
Separator 8, the second separator 9, third separator 10, the 4th separator 11 the oil product separated respectively from separator liquid phase
Outlet outflow, and collect and return to storage tank in the form of cold oil or otherwise store.
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
Using certain Diversity refrigerant, the operating condition of refrigerant circuit are as follows: low pressure 200kPa, high pressure 2000kPa,
Assuming that compressor adiabatic efficiency is 85%, ignore each heat exchanger pressure drop and leakage heat.Process mould is carried out using chemical engineering software HYSYS
Quasi-, as the result is shown: oil gas can be condensed to -130 DEG C, and normal butane, iso-butane, pentane, isopentane, n-hexane are condensed,
Only these hydro carbons of remaining methane, ethane, propane, specific concentration are as shown in table 2 in tail gas:
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 0.27kWh.
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
Outlet is equipped with device for drying and filtering 19 and bottom heat exchanger 20.
The outlet at bottom of rectifier unit 3 is sequentially connected device for drying and filtering 19 and bottom heat exchanger 20 first, then again with
Three articles of branches where two restricting elements 13, third restricting element 14 and the 4th restricting element 15 are connected；
A high-pressure refrigerant pipeline and a low pressure refrigerant pipeline are equipped in bottom heat exchanger 19.Specifically, rectifying
The bottom liquid outlet 3b of device 3 is connected with the import 19a of device for drying and filtering 19, the outlet 19b of device for drying and filtering 19 and bottom
The high-pressure refrigerant conduit entrance 20a of heat exchanger 20 is connected；The high-pressure refrigerant pipe outlet 20b of the bottom heat exchanger 20
Respectively with the import 13a of the second restricting element 13, the import 14a of third restricting element 14, the 4th restricting element 15 import 15a
It is connected；The low pressure refrigerant conduit entrance 20c of the outlet of capital heat exchanger cooling pipe the road 3e and bottom heat exchanger 20 of rectifier unit 3
It is connected；The low pressure refrigerant pipe outlet 20d of bottom heat exchanger 20 is connected with the air entry 1a of compressor 1.
In the bottom heat exchanger 20, high-pressure refrigerant conduit entrance 20a and low pressure refrigerant pipe outlet 20d exist
The same side, high-pressure refrigerant pipe outlet 20b and low pressure refrigerant conduit entrance 20c are in the other side, to realize cold fluid and hot fluid
Reverse 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 third heat exchanger list newly
Member.
Third heat exchanger unit includes the 4th heat exchanger 22, the 5th heat exchanger 25, the first shut-off valve 21, the second shut-off valve
23, third shut-off valve 24, the 4th shut-off valve 26, the 5th shut-off valve 27, the 6th shut-off valve 28, the 7th shut-off valve 29 and the 8th cut-off
Valve 30, the 4th heat exchanger 22 and the 5th heat exchanger 25 are arranged in parallel, wherein the first shut-off valve 21 and the second shut-off valve 23 link, the
Three shut-off valves 24 and the 4th shut-off valve 26 link, the 5th shut-off valve 27 and the linkage of the 6th shut-off valve 28, the 7th shut-off valve 29 and the
The linkage of eight shut-off valves 30.
Specifically, oil gas is connected with the import 21a of the first shut-off valve 21 and 24 import 24a of third shut-off valve respectively first；
The exhaust pipe of First Heat Exchanger 4 exports the 4f import 29a with the import 27a of the 5th shut-off valve 27 and the 7th shut-off valve 29 respectively
It is connected, so that tail gas is divided into two branches；The outlet of the oil-gas pipeline import 22a of 4th heat exchanger 22 and the first shut-off valve 21
21b is connected, and oil-gas pipeline outlet 22b is connected with the import 23a of the second shut-off valve 23, the cut-off of exhaust pipe import 22c and the 5th
The outlet 27a of valve 27 is connected, and exhaust pipe outlet 22d is connected with the import 28a of the 6th shut-off valve 28；The oil of 5th heat exchanger 25
Feed channel import 25a is connected with the outlet 24a of third shut-off valve 24, and oil-gas pipeline exports the import of 25b and the 4th shut-off valve 26
26a is connected, and exhaust pipe import 25c is connected with the outlet 29b of the 7th shut-off valve 29, and exhaust pipe exports the cut-off of 25d and the 8th
The import 30a of valve 30 is connected；Second cut-off valve outlet 23b and the 4th cut-off valve outlet 26b are connected, pool after a pipeline with
The oil-gas pipeline import 4g of First Heat Exchanger 4 is connected；The outlet 30b of the outlet 28b and the 8th shut-off valve 30 of 6th shut-off valve 28
It is connected, pools the outlet after a pipeline as tail gas.
The outlet the oil-gas pipeline import 22a and exhaust pipe 22d of 4th heat exchanger 22 is located at the same side, oil-gas pipeline outlet
22b and exhaust pipe import 22c is located at the other side, to realize counterflow heat exchange；The oil-gas pipeline import 25a of 5th heat exchanger 25 and
Exhaust pipe outlet 25d is located at the same side, and oil-gas pipeline outlet 25b and exhaust pipe import 25c 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 21, the second shut-off valve 23, the 5th shut-off valve 27 and the 6th shut-off valve 28, simultaneously close off third shut-off valve 24, the 4th shut-off valve
25, in the 4th heat exchanger 22 heat exchange occurs for the 7th shut-off valve 29 and the 8th shut-off valve 30, 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 5th heat exchanger 25 implements draining or defrosting process；When being
After system operation a period of time, the first shut-off valve 21, the second shut-off valve 23, the 5th shut-off valve 27, the 6th shut-off valve 28 are simultaneously closed off,
Third shut-off valve 24, the 4th shut-off valve 25, the 7th shut-off valve 27, the 8th shut-off valve 30 are opened simultaneously, by changing for oil gas and tail gas
Thermal process is switched in the 5th heat exchanger 25 and carries out, and the 4th heat exchanger 22 implements draining or defrosting process at this time.
Embodiment 4
As shown in figure 4, rectification type Auto-cascade cycle low-temperature condensing vapour separation system includes normal concentration circuit, the first Variable Composition
Circuit, the second Variable Composition circuit.Normal concentration circuit and the connection type in Oil-gas Separation circuit in embodiment 1 are similar with structure,
But the first Variable Composition circuit and the second Variable Composition circuit are increased between rectifying column and compressor.Each circuit is carried out below
Illustrate:
(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 34a of the 11st shut-off valve 34；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 13a of the second restricting element 13, third restricting element
The import 31a of 14 import 14a, the import 15a of the 4th restricting element 15 and the 9th shut-off valve 31 are connected.
(2) first Variable Composition circuits:
First Variable Composition circuit is by being sequentially connected in series 33 groups of the 9th shut-off valve 31, fluid reservoir 32 and the tenth shut-off valve of setting
At.Wherein the import 31a of the 9th shut-off valve 31 is connected with the outlet at bottom 3b of rectifier unit 3, the import of outlet and fluid reservoir 32
32a is connected；The import 33a of tenth shut-off valve 33 is connected with the outlet 32b of fluid reservoir 32, exports the air entry of 33b 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 34 of setting, the first air accumulator 35 and the 12nd ends
Valve 36 forms.Wherein the import 34a of the 11st shut-off valve 34 is connected with the top exit 3c of rectifier unit 3, exports 34b and first
The import 35a of air accumulator 35 is connected；The import 36a of 12nd shut-off valve 36 is connected with the outlet 35b of the first air accumulator 35, outlet
36b is connected with the air entry 1a of compressor 1.
The 9th shut-off valve 31, the tenth shut-off valve 33, the 11st shut-off valve 34, the 12nd shut-off valve 36 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 31, the tenth shut-off valve 33, the 11st shut-off valve 34, the 12nd shut-off valve 36 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 31, will be enriched in the hybrid refrigeration of high boiling component from rectifying
Column bottom is introduced into fluid reservoir 32, the 9th shut-off valve 31 is closed after a period of time, so that high boiling component in normal concentration circuit
Refrigerant is reduced, and improves the concentration of low boiling component in the refrigerant for participating in circulation, and capable of freezing than normal concentration, it is lower to realize
Cryogenic temperature, the light hydrocarbon in oil gas can be handled more thorough.
Enable the second Variable Composition circuit: opening the 12nd shut-off valve 36, will be enriched in the mix refrigerant of low boiling component from
It is released in first air accumulator 35, the 12nd shut-off valve 36 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 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 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 34, will be enriched in the mix refrigerant storage of low boiling component
It is stored in the first air accumulator 35, the 11st shut-off valve 34 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 33, the mixing of high boiling component will be rich in fluid reservoir 32
Refrigerant is released, and the tenth shut-off valve 33 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 12
Import 12a and third heat exchanger 6 positive stream refrigerant tubing outlet 6b between be equipped with the 5th separator 40, described the 5th point
From between device 40 and the air entry 1a of compressor 1 be equipped with third Variable Composition circuit；Third Variable Composition circuit by be sequentially connected in series
13 shut-off valves 37, the second air accumulator 38 and the 14th shut-off valve 39 composition；Wherein, the import 37a of the 13rd shut-off valve 37 with
The gaseous phase outlet 40c of 5th separator 40 is connected, and outlet 37b is connected with the import 38a of the second air accumulator 38；14th shut-off valve
39 import 39a is connected with the outlet 38b of the second air accumulator 38, and outlet 39b 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 39 is opened, by the higher hybrid refrigeration of low boiling component ratio
Agent is released from the second air accumulator 38, and the 14th shut-off valve 39 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 37 is opened, by the most hybrid refrigeration of amount of components having low boiling points
Agent is stored into the second air accumulator 38, and the 13rd shut-off valve 37 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 is same as Example 4.
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 (9)
1. a kind of oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation, including compressor (1), condenser (2), rectifier unit
(3) and oil gas condensation separating circuit；Compressor (1) outlet is connected with condenser (2) import；The condenser
(2) outlet is connected with rectifier unit (3) import；The rectifier unit (3) includes rectifying column and is connected with rectifying column top
Capital heat exchanger, capital heat exchanger top exit is connected with oil gas condensation separating circuit, which is characterized in that the oil gas is cold
Solidifying separating circuit includes First Heat Exchanger unit, the second heat exchanger unit, first throttle element (12) and separator unit；
The First Heat Exchanger unit includes First Heat Exchanger (4), the second heat exchanger (5) and third heat exchanger (6)；
The first throttle element (12) is set between First Heat Exchanger unit and the second heat exchanger unit；
Second heat exchanger unit includes evaporator (7)；
The separator unit includes the first separator (8), the second separator (9), third separator (10) and the 4th separation
Device (11)；
The First Heat Exchanger (4), the second heat exchanger (5) are equipped with a positive stream refrigerant pipe in third heat exchanger (6)
Road, the refrigerant tubing that backflows, an oil-gas pipeline and an exhaust pipe；It is low equipped with one in the evaporator (7)
Compression refrigerant pipeline and an oil-gas pipeline；Cooling pipe is equipped in the capital heat exchanger of the rectifier unit (3)；Described
First separator (8), the second separator (9), third separator (10) and the 4th separator (11) are equipped with gaseous phase outlet and liquid
Mutually export；
The positive stream refrigerant tubing import of capital heat exchanger top exit with the First Heat Exchanger (4) is connected；Described
The positive stream refrigerant tubing outlet of one heat exchanger (4) is connected with the positive stream refrigerant tubing import of the second heat exchanger (5)；Described
The positive stream refrigerant tubing outlet of second heat exchanger (5) is connected with the positive stream refrigerant tubing import of third heat exchanger (6)；It is described
The positive stream refrigerant tubing outlet of import and third heat exchanger (6) of first throttle element (12) be connected, export and evaporator
(7) refrigerant tubing import of backflowing is connected；Backflow refrigerant tubing outlet and the third heat exchanger of the evaporator (7)
(6) refrigerant tubing import of backflowing is connected；Backflow refrigerant tubing outlet and the second heat exchange of the third heat exchanger (6)
The refrigerant tubing import of backflowing of device (5) is connected；The refrigerant tubing outlet of backflowing of second heat exchanger (5) is changed with first
The refrigerant tubing import of backflowing of hot device (4) is connected；Backflow refrigerant tubing outlet and the rectifying of the First Heat Exchanger (4)
The import in the capital heat exchanger cooling pipe road of device (3) is connected；The outlet in the capital heat exchanger cooling pipe road and compressor
(1) air entry connection；
The oil-gas pipeline outlet of the First Heat Exchanger (4) is connected with the import of the first separator (8)；First separation
The gaseous phase outlet of device (8) is connected with the oil-gas pipeline import of the second heat exchanger (5)；The Oil/Gas Pipe of second heat exchanger (5)
Road outlet is connected with the import of the second separator (9)；The gaseous phase outlet of second separator (9) and third heat exchanger (6)
Oil-gas pipeline import be connected；The import phase of the oil-gas pipeline outlet and third separator (10) of the third heat exchanger (6)
Even；The gaseous phase outlet of the third separator (10) is connected with the oil-gas pipeline import of evaporator (7)；The evaporator
(7) oil-gas pipeline outlet is connected with the import of the 4th separator (11)；The gaseous phase outlet of 4th separator (11) with
The exhaust pipe import of third heat exchanger (6) is connected；Exhaust pipe outlet and the second heat exchanger of the third heat exchanger (6)
(5) exhaust pipe import is connected；The tail gas of the exhaust pipe outlet and First Heat Exchanger (4) of second heat exchanger (5)
Conduit entrance is connected；
The outlet at bottom of the rectifier unit (3) by three branches respectively with First Heat Exchanger (4), the second heat exchanger (5) and
The import of the refrigerant tubing that backflows of third heat exchanger (6) is connected；Three branch road is respectively equipped with a restricting element;
The outlet at bottom of the capital heat exchanger by three bypass lines respectively with First Heat Exchanger (4), the second heat exchanger (5)
It is connected with the import of the refrigerant tubing that backflows of third heat exchanger (6), a section is respectively equipped in three bypass lines
Fluid element；
The oil and gas separating system further includes third heat exchanger unit；The third heat exchanger unit includes the 4th heat exchanger
(22), the 5th heat exchanger (25), the first shut-off valve (21), the second shut-off valve (23), third shut-off valve (24), the 4th shut-off valve
(26), the 5th shut-off valve (27), the 6th shut-off valve (28), the 7th shut-off valve (29) and the 8th shut-off valve (30)；Described the 4th
Heat exchanger (22) and the 5th heat exchanger (25) are arranged in parallel；
An oil-gas pipeline and an exhaust pipe are equipped with inside 4th heat exchanger (22) and the 5th heat exchanger (25)；
The exhaust pipe outlet of First Heat Exchanger (4) is connected with the 5th shut-off valve (27) and the 7th shut-off valve (29) import respectively, so that
Tail gas is divided into two branches；The oil-gas pipeline import of 4th heat exchanger (22) is connected with the first shut-off valve (21) outlet,
Oil-gas pipeline outlet is connected with the second shut-off valve (23) import, and exhaust pipe import is connected with the outlet of the 5th shut-off valve (27), tail
Feed channel outlet is connected with the 6th shut-off valve (28) import；
The oil-gas pipeline import of 5th heat exchanger (25) and third shut-off valve (24) outlet are connected, oil-gas pipeline outlet and
4th shut-off valve (26) import is connected, and the outlet of exhaust pipe import and the 7th shut-off valve (29) is connected, and exhaust pipe exports and the
(30) import of eight shut-off valves is connected；Second shut-off valve (23) outlet is connected with the outlet of the 4th shut-off valve (26), pools
It is connected after one pipeline with the oil-gas pipeline import of First Heat Exchanger (4)；6th shut-off valve (28) exports and the 8th section
Only valve (30) outlet is connected, and pools the outlet after a pipeline as tail gas.
2. the oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation according to claim 1, which is characterized in that described
The outlet at bottom of rectifier unit (3) is connected with device for drying and filtering (19) and bottom heat exchanger (20) in turn first, then again with institute
Three branches stated are connected；It is equipped with heat exchanger high-voltage refrigerant tubing in bottom in the bottom heat exchanger (20) and bottom exchanges heat
Device low pressure refrigerant pipeline；Device for drying and filtering (19) import is connected with rectifier unit (3) outlet at bottom, outlet and bottom
Heat exchanger high-voltage refrigerant tubing import is connected；The described bottom heat exchanger high-voltage refrigerant tubing outlet again respectively with branch road
Restricting element import be connected；The bottom heat exchanger low pressure refrigerant conduit entrance and rectifier unit (3) capital heat exchanger
Outlet is connected, and outlet is connected with the air entry of compressor (1).
3. the oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation according to claim 1, which is characterized in that described
The first Variable Composition circuit and the second Variable Composition circuit in parallel are equipped between rectifier unit (3) and the air entry of compressor (1)；The
One Variable Composition circuit includes the 9th shut-off valve (31), fluid reservoir (32) and the tenth shut-off valve (33) being sequentially connected in series；Second thickens
Spending circuit includes the 11st shut-off valve (34), the first air accumulator (35) and the 12nd shut-off valve (36) being sequentially connected in series；Described
The import of nine shut-off valves (31) is connected with the outlet at bottom of rectifier unit (3), the import and essence of the 11st shut-off valve (34)
The capital heat exchanger top exit of distillation unit (3) is connected；The outlet of tenth shut-off valve (33) and the 12nd shut-off valve
(36) outlet is connected with the air entry of compressor (1).
4. the oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation according to claim 3, which is characterized in that described
The 5th separator is equipped between the import of one restricting element (12) and the high-pressure refrigerant pipe outlet of third heat exchanger (6)
(40)；Third Variable Composition circuit is equipped between 5th separator (40) and the air entry of compressor (1)；The third
Variable Composition circuit includes the 13rd shut-off valve (37), the second air accumulator (38) and the 14th shut-off valve (39) being sequentially connected in series, the
The import of 13 shut-off valves (37) is connected with the gaseous phase outlet of the 5th separator (40).
5. the oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation according to claim 4, which is characterized in that described
Condenser (2), First Heat Exchanger (4), the second heat exchanger (5), third heat exchanger (6), evaporator (7), the 4th heat exchanger (22),
5th heat exchanger (25) and bottom heat exchanger (20) are double pipe heat exchanger, spray-type heat exchanger, shell and tube exchanger or plate wing
Formula heat exchanger.
6. the oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation described in any claim according to claim 1 ~ 5,
It is characterized in that, the refrigerant used in the system is non-azeotropic mixed working medium more than binary.
7. the oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation described in any claim according to claim 1 ~ 5,
It is characterized in that, each restricting element is manual throttle valve, automatic throttle or capillary.
8. the oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation described in any claim according to claim 1 ~ 5,
It is characterized in that, the rectifying column in the rectifier unit is material filling type or column plate type.
9. the oil and gas separating system of rectification type Auto-cascade cycle cryogenic condensation described in any claim according to claim 1 ~ 5,
It is characterized in that, each shut-off valve is two-way shut-off valve manually or automatically.
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| CN108310898A (en) * | 2018-04-18 | 2018-07-24 | 山东豪迈机械制造有限公司 | A kind of exhaust gas processing device |
| CN112880303A (en) * | 2021-03-02 | 2021-06-01 | 中科泓能(北京)科技有限公司 | Method and device for recycling olefin and nitrogen in polyolefin tail gas through multi-stage self-cascade refrigeration |
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| EP0545214A3 (en) * | 1991-12-04 | 1993-09-01 | Radex-Heraklith Industriebeteiligungs Aktiengesellschaft | Process for waste air purification from oil-mill plants |
| 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 |
| CN102147162A (en) * | 2011-03-16 | 2011-08-10 | 浙江大学 | Rectifying type variation-concentration self-overlaying gas liquefaction system |
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| EP0545214A3 (en) * | 1991-12-04 | 1993-09-01 | Radex-Heraklith Industriebeteiligungs Aktiengesellschaft | Process for waste air purification from oil-mill plants |
| 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 |
| CN202039030U (en) * | 2011-03-11 | 2011-11-16 | 南京都乐制冷设备有限公司 | Oil gas recovering system |
| CN102147162A (en) * | 2011-03-16 | 2011-08-10 | 浙江大学 | Rectifying type variation-concentration self-overlaying gas liquefaction system |
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