CN106839650A - Gas in natural gas recovery system and technique - Google Patents
Gas in natural gas recovery system and technique Download PDFInfo
- Publication number
- CN106839650A CN106839650A CN201710170361.4A CN201710170361A CN106839650A CN 106839650 A CN106839650 A CN 106839650A CN 201710170361 A CN201710170361 A CN 201710170361A CN 106839650 A CN106839650 A CN 106839650A
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- gas
- domethanizing column
- heat exchanger
- recovery system
- natural gas
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- 239000007789 gas Substances 0.000 title claims abstract description 86
- 238000005380 natural gas recovery Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000011084 recovery Methods 0.000 claims abstract description 28
- 239000003345 natural gas Substances 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000009833 condensation Methods 0.000 claims description 9
- 230000005494 condensation Effects 0.000 claims description 9
- 238000001802 infusion Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000004069 differentiation Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000001335 aliphatic alkanes Chemical group 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
- F25J3/0209—Natural gas or substitute natural gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0238—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 2 carbon atoms or more
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/02—Processes or apparatus using separation by rectification in a single pressure main column system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/40—Features relating to the provision of boil-up in the bottom of a column
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/50—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/70—Refluxing the column with a condensed part of the feed stream, i.e. fractionator top is stripped or self-rectified
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
- F25J2205/04—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum in the feed line, i.e. upstream of the fractionation step
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/60—Natural gas or synthetic natural gas [SNG]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/30—Compression of the feed stream
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Disclosed by the invention is a kind of gas in natural gas recovery system and recovery process of petrochemical industry, the system includes the cleaning system for removing impurity in raw natural gas and the piece-rate system for composition differentiation in natural gas, also include cold energy recovery system, the cold energy recovery system includes being arranged on the circulation line between heat exchanger and domethanizing column and the pump on circulation line in piece-rate system, and the condensed fluid in the domethanizing column is reached after heat exchanger exchanges heat through circulation line and returns domethanizing column heat supply.The beneficial effects of the invention are as follows：By increasing a set of cold energy recovery system in existing recovery system, cold energy recovery system sends the condensate liquid and cryogenic gas in piece-rate system domethanizing column back to heat exchanger for heat exchanger cooling as heat transfer medium, domethanizing column heat supply is returned after absorbing heat, so as to play a part of resource recycling, the comprehensive utilization ratio of resource is improve, with good Social benefit and economic benefit.
Description
Technical field
The present invention relates to petrochemical industry, more particularly to a kind of gas recovery system for oil and recovery work for natural gas
Skill.
Background technology
For the natural gas that the raw natural gas overflowed from oilfield exploitation or gas transmission are discharged, these gases escape into sky
Air and environment can be polluted in gas, run into thundery sky and be also possible to trigger security incident, it is therefore desirable to these natural gases
Reclaimed, but all contained a large amount of light oils in these gases, it is impossible to be directly used in life and production and application, it is necessary to recovery
Natural gas carries out separating-purifying treatment, to reach the purpose of waste resource recycling.
Existing Investigation of Petroleum Vapor Recovery Technology mainly includes absorption method, condensation method, membrane filter method, or with the combination of upper type,
Condensation method production cost is relatively low, is most widely used, but existing condenser system typically all only includes cleaning system and piece-rate system,
Cleaning system is used to remove the impurity in gas, and gas is divided into piece-rate system the methane gas and remaining alkanes group of high-purity
Into liquefied gas, can be respectively used to life and industrial application.Due to the process for having many condensations and compression in whole technical process,
One heat absorption, a heat release, these heat energy conversion are not fully used, and so as to cause the waste of resource, are increased back
Harvest sheet.
The content of the invention
To overcome existing gas in natural gas recovery process to expend, the energy is more, and cost recovery is high to wait not enough, and the present invention is wanted
The technical problem of solution is：A kind of resource utilization gas in natural gas recovery system high and technique are provided.
The technical solution adopted for the present invention to solve the technical problems is：
Gas in natural gas recovery system, including for removing the cleaning system of impurity in raw natural gas and for natural gas
The piece-rate system that middle composition is distinguished, also including cold energy recovery system, the cold energy recovery system includes being arranged in piece-rate system
Circulation line between heat exchanger and domethanizing column and the pump on circulation line, the condensed fluid warp in the domethanizing column
Circulation line returns domethanizing column heat supply after reaching heat exchanger heat exchange.
It is further the first separator, the first compressor that the cleaning system includes being sequentially connected by pipeline, the
One cooler, the second separator and drier, the outlet of drier are connected with the heat exchanger of piece-rate system.
It is further that the piece-rate system includes heat exchanger, the 3rd separator, expanding machine and domethanizing column, described the
The entrance of three separators is connected with heat exchanger, and the upper outlet of the 3rd separator passes through the expanded machine of air delivering pipeline and domethanizing column
Upper gas entrance is connected, and the lower part outlet of the 3rd separator is connected by infusion pipeline with demethanation intermediate feed inlet.
It is further that the cold energy recovery system includes two circulation lines, one is located at domethanizing column middle part, another
Bar is located at demethanizer bottom, and pump is equipped with two circulation lines.
It is further that a heating tube is additionally provided between the circulation line and domethanizing column of the demethanizer bottom
Road, heat supplying pipeline is provided with reboiler.
Be further be additionally provided with the circulation line of the demethanizer bottom drain pipe road lead to fluid reservoir or
Fractionating column.
It is further that the cold energy recovery system is also arranged between heat exchanger and demethanizer overhead including one
Gas backstreaming pipeline, repressurization is cold after the methane gas on domethanizing column top is imported heat exchanger cooling by the gas backstreaming pipeline
But finished product natural gas is formed.
It is further that the gas backstreaming pipeline by the second compressor, second after heat exchanger by successively cooling down
Device, the 3rd compressor and the 3rd cooler form finished product natural gas, and second compressor is one with the expanding machine of piece-rate system
The coaxial expansion compressor of body.
Gas in natural gas recovery process, comprises the following steps：
A, raw natural gas are passed through cleaning system, using mechanical admixture and moisture in cleaning system removal gas；
B, the gas after pressurized purge is passed through piece-rate system, by C3 in gas by the way of further cooling, pressurization
Composition above is compressed into liquid, again separates the composition of more than C2 in gas in domethanizing column after gas-liquid separation, final
To the methane gas and more than C2 of high-purity into the condensation liquefaction gas being grouped into；
C, the partial condensation liquefied gas in domethanizing column is directed back to by circulation line to return in the heat exchanger of piece-rate system
Cold is received, while the heat for obtaining is supplied to domethanizing column, another part liquefied gas to enter storage tank or subsequent handling；
D, the low temperature methane gas in domethanizing column is directed back in the heat exchanger of piece-rate system by gas backstreaming pipeline
Cooling, pressurization cooling technique formation finished product natural gas is carried out after obtaining normal temperature methane gas again.
The beneficial effects of the invention are as follows：By increasing a set of cold energy recovery system in existing recovery system, cold energy is reclaimed
System sends the condensate liquid and cryogenic gas in piece-rate system domethanizing column back to heat exchanger for heat exchanger cooling as heat transfer medium,
Domethanizing column heat supply is returned after absorbing heat, so as to play a part of resource recycling, the comprehensive utilization of resource is improve
Rate, with good Social benefit and economic benefit.
Brief description of the drawings
Fig. 1 is present invention process schematic flow sheet.
Mark is 1- cleaning systems in figure, and 2- piece-rate systems, 3- cold energy recovery systems, the compressors of 4- second, 5- second is cold
But device, the compressors of 6- the 3rd, the coolers of 7- the 3rd, 8- drain pipes road, the separators of 11- first, the compressors of 12- first, 13- first
Cooler, the separators of 14- second, 15- driers, 21- heat exchangers, the separators of 22- the 3rd, 23- air delivering pipelines, 24- woven hoses
Road, 25- expanding machines, 26- domethanizing columns, 31- circulation lines, 32- pumps, 33- heat supplying pipelines, 34- reboilers, 35- gas backstreamings
Pipeline.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in figure 1, the present invention is included for removing the cleaning system 1 of impurity in raw natural gas and in natural gas
The piece-rate system 2 that composition is distinguished, also including cold energy recovery system 3, the cold energy recovery system 3 includes being arranged on piece-rate system 2
Circulation line 31 between middle heat exchanger 21 and domethanizing column 26 and the pump on circulation line 31 32, the domethanizing column 26
In condensed fluid through circulation line 31 reach heat exchanger 21 exchange heat after return the heat supply of domethanizing column 26.In piece-rate system 2
Heat exchanger 21 is mainly used in reducing the temperature of gas, and the composition of more than C3 in gas is condensed into liquid, therefore heat exchanger 21 is needed
Chilling temperature that will be very low, is typically in the prior art that heat exchanger 21 provides cold by way of outside adds refrigerant,
It is required relatively costly, and the condensed fluid temperature from domethanizing column 26 out is relatively low, its cold can be used for into heat exchanger 21, changes
Liquid after heat again can be for needed for domethanizing column 26 be provided heat, so as to improve the comprehensive utilization ratio of resource, lower the energy and disappear
Consumption.
The cleaning system 1 includes that the first separator 11 being sequentially connected by pipeline, the first compressor 12, first are cooled down
Device 13, the second separator 14 and drier 15, the outlet of drier 15 are connected with the heat exchanger 21 of piece-rate system 2.First separates
Device 11 is mainly used in removing the impurity and moisture in gas, is then compressed, cools down, separates, and will be produced in compression cooling procedure
Raw moisture and greasy dirt composition are removed, and the heat exchanger 21 of the paraffin gas feeding piece-rate system 2 that then will be obtained carries out follow-up
Separating technology.
The piece-rate system 2 includes heat exchanger 21, the 3rd separator 22, expanding machine 25 and domethanizing column 26, the described 3rd
The entrance of separator 22 is connected with heat exchanger 21, the upper outlet of the 3rd separator 22 by the expanded machine 25 of air delivering pipeline 23 with
The upper gas entrance of domethanizing column 26 is connected, and the lower part outlet of the 3rd separator 22 is by infusion pipeline 24 and domethanizing column 26
Portion liquid inlet is connected.The temperature of heat exchanger 21 is very low, the paraffin gas of more than C2 can be condensed into liquid, the gas of below C2
After being lowered the temperature into the expansion throttling of expanding machine 25 by air delivering pipeline 23 demethanation technique, more than C3 are carried out into the top of domethanizing column 26
Condensed fluid the middle part of domethanizing column 26 is entered by infusion pipeline 24.
The cold energy recovery system 3 includes two circulation lines 31, and one is located at the middle part of domethanizing column 26, and another is located at
The bottom of domethanizing column 26, pump 32 is equipped with two circulation lines 31.Because the middle part of domethanizing column 26 is different with temperature of lower,
Two pipeline can provide different potential temperature demands for system.
By the condensed fluid after the heat exchange of heat exchanger 21, heating load is limited after domethanizing column 26 is returned to, in order to meet piptonychia
The work of alkane tower 26 institute calorific requirement, one is additionally provided between the circulation line 31 and domethanizing column 26 of the bottom of the domethanizing column 26
Heat supplying pipeline 33, heat supplying pipeline 33 is provided with reboiler 34, and reboiler 34 can also be when system be just run for system provides heat.
Can be directly as domestic fuel or industrial chemicals, so described de- from the bottom of domethanizing column 26 condensate liquid out
A drain pipe road 8 is additionally provided with the circulation line 31 of the bottom of methane tower 26 and leads to fluid reservoir or fractionating column, condensate liquid is delivered to
Other technological processes.
Because the methane gas from the top of domethanizing column 26 out also has relatively low temperature, in order to using temperature money
Source, can also be conducted into heat exchanger 21, and concrete structure is to set one between the heat exchanger 21 and the top of domethanizing column 26
Gas backstreaming pipeline 35, after the methane gas on the top of domethanizing column 26 is imported the cooling of heat exchanger 21 by the gas backstreaming pipeline 35
Repressurization is cooled into finished product natural gas, so as to further improve resource utilization.
Further, the gas backstreaming pipeline 35 is by successively cold by the second compressor 4, second after heat exchanger 21
But device 5, the 3rd compressor 6 and the 3rd cooler 7 form finished product natural gas, the expansion of second compressor 4 and piece-rate system 2
The coaxial expansion compressor that machine 25 is integrated.Due to expanding and compressing reverse procedure each other, can be same using coaxial expansion compressor
When complete two procedures, further reduce energy resource consumption.
Gas in natural gas recovery process, comprises the following steps：
A, raw natural gas are passed through cleaning system, using mechanical admixture and moisture in cleaning system removal gas；
B, the gas after pressurized purge is passed through piece-rate system, by C3 in gas by the way of further cooling, pressurization
Composition above is compressed into liquid, again separates the composition of more than C2 in gas in domethanizing column after gas-liquid separation, final
To the methane gas and more than C2 of high-purity into the condensation liquefaction gas being grouped into；
C, the partial condensation liquefied gas in domethanizing column is directed back to by circulation line to return in the heat exchanger of piece-rate system
Cold is received, while the heat for obtaining is supplied to domethanizing column, another part liquefied gas to enter storage tank or subsequent handling；
D, the low temperature methane gas in domethanizing column is directed back in the heat exchanger of piece-rate system by gas backstreaming pipeline
Cooling, pressurization cooling technique formation finished product natural gas is carried out after obtaining normal temperature methane gas again.
The system and technique will be divided by increasing a set of cold energy recovery system, cold energy recovery system in existing recovery system
Condensate liquid and cryogenic gas in system domethanizing column send heat exchanger back to for heat exchanger cooling as heat transfer medium, absorb heat
After return domethanizing column heat supply, so as to play a part of resource recycling, the comprehensive utilization ratio of resource is improve, with good
Good Social benefit and economic benefit.
Claims (9)
1. gas in natural gas recovery system, including for removing the cleaning system (1) of impurity in raw natural gas and for natural
The piece-rate system (2) that composition is distinguished in gas, it is characterized in that：Also include cold energy recovery system (3), the cold energy recovery system (3)
Including the circulation line (31) being arranged in piece-rate system (2) between heat exchanger (21) and domethanizing column (26) and positioned at circulation pipe
Pump (32) on road (31), the condensed fluid in the domethanizing column (26) reaches heat exchanger (21) and exchanges heat through circulation line (31)
After return domethanizing column (26) provide thermal source.
2. gas in natural gas recovery system as claimed in claim 1, it is characterized in that：The cleaning system (1) is including by pipe
The first separator (11), the first compressor (12), the first cooler (13), the second separator (14) and drying that road is sequentially connected
Device (15), the outlet of drier (15) is connected with the heat exchanger (21) of piece-rate system (2).
3. gas in natural gas recovery system as claimed in claim 1, it is characterized in that：The piece-rate system (2) is including heat exchanger
(21), the 3rd separator (22), expanding machine (25) and domethanizing column (26), the entrance and heat exchanger of the 3rd separator (22)
(21) it is connected, the upper outlet of the 3rd separator (22) is by air delivering pipeline (23) expanded machine (25) and domethanizing column (26)
Portion gas access is connected, and the lower part outlet of the 3rd separator (22) is by infusion pipeline (24) and domethanizing column (26) central liquid
Entrance is connected.
4. gas in natural gas recovery system as claimed in claim 1, it is characterized in that：The cold energy recovery system (3) is including two
Bar circulation line (31), one is located at domethanizing column (26) middle part, and another is located at domethanizing column (26) bottom, two circulation pipes
Pump (32) is equipped with road (31).
5. gas in natural gas recovery system as claimed in claim 4, it is characterized in that：The circulation of domethanizing column (26) bottom
A heat supplying pipeline (33) is additionally provided between pipeline (31) and domethanizing column (26), heat supplying pipeline (33) is provided with reboiler
(34)。
6. gas in natural gas recovery system as claimed in claim 5, it is characterized in that：The circulation of domethanizing column (26) bottom
A drain pipe road (8) is additionally provided with pipeline (31) and leads to liquid storage pipe or fractionating column.
7. gas in natural gas recovery system as claimed in claim 1, it is characterized in that：The cold energy recovery system (3) also includes
One gas backstreaming pipeline (35) being arranged between heat exchanger (21) and domethanizing column (26) top, the gas backstreaming pipeline
(35) repressurization is cooled into finished product natural gas after the methane gas on domethanizing column (26) top being imported into heat exchanger (21) cooling.
8. the gas in natural gas recovery system as described in claim 3 and 7, it is characterized in that：The gas backstreaming pipeline (35) exists
By priority after heat exchanger (21) by the second compressor (4), the second cooler (5), the 3rd compressor (6) and the 3rd cooler
(7) finished product natural gas, the coaxial expansion that second compressor (4) is integrated with the expanding machine (25) of piece-rate system (2) are formed
Compressor.
9. gas in natural gas recovery process, it is characterized in that, comprise the following steps：
A, raw natural gas are passed through cleaning system, using mechanical admixture and moisture in cleaning system removal gas；
B, the gas after pressurized purge is passed through piece-rate system, by more than C3 in gas by the way of further cooling, pressurization
Composition be compressed into liquid, after gas-liquid separation again in domethanizing column by gas more than C2 composition separate, finally give height
The methane gas and more than C2 of purity are into the condensation liquefaction gas being grouped into；
C, the partial condensation liquefied gas in domethanizing column is directed back to by circulation line to reclaim cold in the heat exchanger of piece-rate system
Amount, while the heat for obtaining is supplied to domethanizing column, another part liquefied gas to enter storage tank or subsequent handling；
D, the low temperature methane gas in domethanizing column is directed back to cooling in the heat exchanger of piece-rate system by gas backstreaming pipeline,
Pressurization cooling technique formation finished product natural gas is carried out again after obtaining normal temperature methane gas.
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