CN206666414U - A kind of device of ethane recovery co-production of liquefied natural gas - Google Patents
A kind of device of ethane recovery co-production of liquefied natural gas Download PDFInfo
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- CN206666414U CN206666414U CN201720399716.2U CN201720399716U CN206666414U CN 206666414 U CN206666414 U CN 206666414U CN 201720399716 U CN201720399716 U CN 201720399716U CN 206666414 U CN206666414 U CN 206666414U
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- pipeline
- ice chest
- natural gas
- domethanizing column
- ethane
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Abstract
The utility model discloses a kind of device of ethane recovery co-production of liquefied natural gas, including liquefaction ice chest, hydrocarbon liquid/gas separator and the domethanizing column being sequentially connected；Domethanizing column lower part outlet, demethanizer reboiler, domethanizing column lower entrances pass sequentially through pipeline connection；Demethanizer bottom outlet is connected with ethane recovery pipeline；Demethanizer overhead gas outlet, the LNG pipeline of liquefy ice chest, first throttle valve and subsequent processing are sequentially connected；The liquefaction ice chest, refrigerant compressor, cryogen cooler pass sequentially through pipeline connection, form the cryogen refrigeration circulatory system.The utility model has the advantages that：Circulated using outside cryogen refrigeration and carry out ethane recovery co-production liquefied natural gas, on the one hand the recovery by ethane and ethane above component is realized, on the other hand prepared by liquefied natural gas to the high methane gas after ethane recovery, can effectively reduce investment, with preferable economic benefit, and product yield is high.
Description
Technical field
Lighter hydrocarbons recovery and liquefaction Technology of Natural Gas field are the utility model is related to, more particularly to a kind of ethane recovery coproduction
The process unit of liquefied natural gas, the technique for specifically reclaiming the light hydrocarbon component such as ethane and liquefied gas, suitable for natural gas, coal seam
The one or more of the hydrocarbon mixtures such as gas, coke-stove gas.
Background technology
Lighter hydrocarbons recovery refers to the process of reclaim the hydro carbons compounds such as ethane, propane, butane, pentane from natural gas, is also referred to as
Reclaimed for gas reducing liquid.With the development of domestic ethylene industry, it is stone of the raw materials for ethylene production than using routine to use ethane
Cerebrol production ethene more has an economic benefit.Ethane cracking ethene is a ripe technology in the world, have cost it is low, receive
The advantages that rate height, small investment, small pollution, therefore there is very big prospect at home using ethane production ethene.
Domestic annual gas production is huge, and domestic natural gas yield reaches 1368.6 billion cubic meters, natural gas within 2016
In contain substantial amounts of ethane, after being reclaimed be used for produce ethene, there are good economic benefits.But at present, Domestic Oil And Gas Fields
Most of light ends unit is to reclaim propane and propane above component as main purpose, the product such as production liquefied petroleum gas, state
It is interior seldom to reclaim the lighter hydrocarbons recovery factory of ethane and ethane above component purpose.
In natural gas liquefaction carry out lighter hydrocarbons recovery purpose mainly avoid heavy constituent in liquefaction process frozen block equipment and
Pipeline.Typically lighter hydrocarbons recovery process is separately carried out with gas deliquescence process in engineer applied, first carries out lighter hydrocarbons recovery, then
Liquefaction.
Therefore, the cryogen refrigeration circulating in natural gas liquefaction is used for ethane recovery technique, for both needing recovery light
Hydrocarbon liquefied raw material, and there is larger economic benefit again.
The content of the invention
A kind of the shortcomings that the utility model overcomes in the prior art, there is provided dress of ethane recovery co-production of liquefied natural gas
Put, the characteristics of combining traditional natural gas process for recovering light hydrocarbon and natural gas liquefaction process, use cryogen refrigeration system as second
Alkane reclaims and liquefied natural gas process provides cold, and having reduces investment and the feature such as increase economic efficiency, suitable for natural gas,
The one or more of the hydrocarbon mixtures such as coal bed gas, coke-stove gas.
The technical solution of the utility model is：A kind of device of ethane recovery co-production of liquefied natural gas, including be sequentially connected
Liquefaction ice chest, hydrocarbon liquid/gas separator and domethanizing column；Wherein：
The outlet port of domethanizing column bottom first, the first booster pump, liquefaction ice chest, the return port of domethanizing column bottom first
Pass sequentially through pipeline connection；The outlet port of domethanizing column bottom second, the second booster pump, liquefaction ice chest, domethanizing column bottom second
Return port passes sequentially through pipeline connection；Domethanizing column lower part outlet, demethanizer reboiler, domethanizing column lower entrances lead to successively
Piping connects；Demethanizer bottom outlet is connected with ethane recovery pipeline；
The liquefied natural gas of the demethanizer overhead gas outlet, liquefy ice chest, first throttle valve and subsequent processing
Pipeline is sequentially connected；
The liquefaction ice chest, refrigerant compressor, cryogen cooler pass sequentially through pipeline connection, form cryogen refrigeration cyclic system
System.
Compared with prior art, the utility model has the advantages that：Circulated using outside cryogen refrigeration and carry out ethane recovery simultaneously
Co-production of liquefied natural gas, on the one hand realize the recovery by ethane and ethane above component, on the other hand to ethane recovery after
High methane gas prepares liquefied natural gas, can effectively reduce investment, has preferable economic benefit, and product yield is high.
Brief description of the drawings
The utility model will illustrate by example and with reference to the appended drawing, wherein：
Fig. 1 is the system principle schematic diagram of the present apparatus.
In figure：1st, pipeline；2nd, liquefy ice chest；3rd, pipeline；4th, hydrocarbon liquid/gas separator；5th, pipeline；6th, pipeline；7th, pipeline；8th, take off
Methane tower；9th, pipeline；10th, pipeline；11st, pipeline；12nd, demethanizer reflux pump；13rd, pipeline；14th, pipeline；15th, first throttle
Valve；16th, pipeline；17th, pipeline；18th, the first booster pump；19th, pipeline；20th, pipeline；21st, pipeline；22nd, pipeline；23rd, the second supercharging
Pump；24th, pipeline；25th, pipeline；26th, pipeline；27th, demethanizer reboiler；28th, pipeline；29th, cryogen cooler；30th, pipeline；
31st, pipeline；32nd, second throttle；33rd, pipeline；34th, pipeline；35th, the 3rd choke valve；36th, pipeline；37th, pipeline；38th, cryogen pressure
Contracting machine；39th, pipeline.
Embodiment
A kind of device of ethane recovery co-production of liquefied natural gas, as shown in figure 1, including liquefaction ice chest 2, hydrocarbon liquid/gas separator 4,
Domethanizing column 8, demethanizer reflux pump 12, first throttle valve 15, the first booster pump 18, the second booster pump 23, domethanizing column are again
Boil device 27, cryogen cooler 29, second throttle 32, the 3rd choke valve 35, refrigerant compressor 38 etc.；
The liquefaction ice chest 2, hydrocarbon liquid/gas separator 4 are connected by pipeline 3；The gaseous phase outlet of the hydrocarbon liquid/gas separator 4, liquefaction
Ice chest 2, the upper entrance of domethanizing column 8 pass sequentially through the connection of pipeline 5,9；The gaseous phase outlet and liquid phase of the hydrocarbon liquid/gas separator 4 go out
Mouth is connected by pipeline 6,7 with the top of domethanizing column 8 and centre entrance respectively；
The first outlet port of 8 bottom of domethanizing column, the first booster pump 18, liquefaction ice chest 2, the bottom of domethanizing column 8 first return
Mouth passes sequentially through the connection of pipeline 17,19,20；The second outlet port of 8 bottom of domethanizing column, the second booster pump 23, the ice chest 2 that liquefies, take off
The second return port of bottom of methane tower 8 passes sequentially through the connection of pipeline 22,24,25；The lower part outlet of domethanizing column 8, domethanizing column boil again
Device 27, the lower entrances of domethanizing column 8 pass sequentially through the connection of pipeline 26,28；The outlet at bottom of domethanizing column 8 is connected with pipeline 21.
The top exit of domethanizing column 8, liquefaction ice chest 2, demethanizer reflux pump 12, the overhead reflux mouth of domethanizing column 8
Pass sequentially through the connection of pipeline 10,11,13；The liquefaction ice chest 2 is connected with first throttle valve 15 by pipeline 14, first throttle valve
15 are connected with pipeline 16.
The liquefaction ice chest 2, refrigerant compressor 38, cryogen cooler 29 pass sequentially through the connection of pipeline 37,39,30；It is described
Liquefaction ice chest 2 is connected by pipeline 31,33 respectively with second throttle 32；The liquefaction ice chest 2 is distinguished with the 3rd choke valve 35
Connected by pipeline 34,36.
The domethanizing column is plate column or packed tower.
The cryogen that the refrigerant compressor uses is formed as nitrogen, methane, ethane, ethene, propane, propylene, butane, pentane
One or more.
Operation principle of the present utility model is：
First, ethane recovery：
It is cold that natural gas (2200kPa.a~4200kPa.a) from pipeline 1 after desulfurization, decarburization, dehydration is entered into liquefaction
Case 2 is cooled to -75~-45 DEG C in advance, and entering hydrocarbon liquid/gas separator 4 through pipeline 3 carries out gas-liquid separation；Wherein：Liquid phase after separation is through pipe
Road 7 enters in the middle part of domethanizing column 8 (2000kPa.a~4000kPa.a), and the gas phase after separation is divided into two streams, one
(50%-90%) logistics through pipeline 6 enter the top of domethanizing column 8 as domethanizing column feed, reclaim wherein ethane and ethane with
Upper component, another stock (10%-50%) logistics is after pipeline 5 to liquefaction ice chest 2 further extremely -95~-80 DEG C of condensation, through pipeline
9 enter the top of domethanizing column 8 as demethanizer reflux, to reduce ethane content in demethanizer top gas, improve ethane and return
Yield；Cold in liquefaction ice chest 2 is supplemented simultaneously to reduce the load of demethanation reboiler 27, and two strands are extracted out from the bottom of domethanizing column 8
Logistics returns to domethanizing column 8 after entering the liquefaction re-heat of ice chest 2, wherein first burst of rich ethane liquid phase is from the bottom first of domethanizing column 8
Outlet port is pressurized to 2500kPa.a~4500kPa.a through pipeline 17 into the first booster pump 18, enters liquefaction ice chest through pipeline 19
After extremely -70~-55 DEG C of 2 re-heats, the first return port of bottom of domethanizing column 8 is returned through pipeline 20；Second burst of rich ethane liquid phase is from de-
Methane tower the second outlet port of 8 bottom is pressurized to 2500kPa.a~4500kPa.a through pipeline 22 into the second booster pump 23, through pipe
Road 24 enters after extremely -50~-25 DEG C of liquefaction ice chest 2 re-heat returns to the second return port of bottom of domethanizing column 8 through pipeline 25；Demethanation
The lower liquid phase of tower 8 enters after demethanizer reboiler 27 heats through pipeline 26 returns to the lower entrances of domethanizing column 8, root through pipeline 28
The content of methane in demethanizer bottoms liquid phase is controlled according to requirement of the subsequent processing to ethane product and (is normally controlled in
0.1%-5% molar content)；The ethane and ethane above component reclaimed from natural gas passes through from the outlet at bottom of domethanizing column 8
Pipeline 21 to subsequent processing carries out separation ethane；
2nd, the liquefaction of natural gas：
Natural gas rich in methane from the top exit of domethanizing column 8 through pipeline 10 enter liquefaction ice chest 2 further condensation to-
It is divided into two streams after 125~-95 DEG C；Wherein：One (5%-50%) logistics enters demethanizer reflux pump 12 through pipeline 11
It is pressurized to after 3000kPa.a~4500kPa.a through pipeline 13 to the top of domethanizing column 8 as flowing back, reduces demethanizer column overhead
Ethane component content in gas, to improve ethane recovery, another stock (50%-95%) is cooled further in the ice chest 2 that liquefies-
Liquefied natural gas product is used as through pipeline 16 to next work through pipeline 14, the throttling of first throttle valve 15 successively after 160~-145 DEG C
Sequence stores；
3rd, cryogen refrigeration system provides cold for ethane recovery and liquefied natural gas process：
High pressure cryogen 3000kPa.a~5000kPa.a enters after liquefaction ice chest 2 is cooled to -95~-55 DEG C in advance through pipeline 30 and divided
It is the cold required for liquefaction ice chest 2 offer ethane recovery and natural gas liquefaction for two streams, wherein one (5%-50%)
High pressure refrigerant stream successively through piping 31, second throttle 32 throttling be low pressure cryogen (200kPa.a~400kPa.a) after,
Liquefaction ice chest 2 is returned to by pipeline 33 institute's chilling requirement is provided, another stock (50%-95%) high pressure refrigerant stream is through the ice chest 2 that liquefies
Further condensation to after -160~-145 DEG C successively through pipeline 34, the throttling of the 3rd choke valve 35 for low pressure cryogen (220kPa.a~
450kPa.a), liquefaction ice chest 2 is entered by pipeline 36 and institute's chilling requirement is provided；Low pressure cryogen is through the liquefaction re-heat of ice chest 2 to 20~40
It is high pressure cryogen to be pressurized after DEG C by pipeline 37 to refrigerant compressor 38, then after piping 39 enters the cooling of cryogen cooler 29
The liquefaction precooling of ice chest 2 is entered by pipeline 30, cryogen refrigeration circulation is formed and provides institute's chilling requirement for liquefaction ice chest.
Claims (6)
- A kind of 1. device of ethane recovery co-production of liquefied natural gas, it is characterised in that：Including liquefaction ice chest, the hydrocarbon liquid being sequentially connected Separator and domethanizing column；Wherein：The outlet port of domethanizing column bottom first, the first booster pump, liquefaction ice chest, the return port of domethanizing column bottom first are successively Connected by pipeline；The outlet port of domethanizing column bottom second, the second booster pump, liquefaction ice chest, domethanizing column bottom second return Mouth passes sequentially through pipeline connection；Domethanizing column lower part outlet, demethanizer reboiler, domethanizing column lower entrances pass sequentially through pipe Road connects；Demethanizer bottom outlet is connected with ethane recovery pipeline；The LNG pipeline of the demethanizer overhead gas outlet, liquefy ice chest, first throttle valve and subsequent processing It is sequentially connected；The liquefaction ice chest, refrigerant compressor, cryogen cooler pass sequentially through pipeline connection, form the cryogen refrigeration circulatory system.
- A kind of 2. device of ethane recovery co-production of liquefied natural gas according to claim 1, it is characterised in that：The hydrocarbon liquid Gaseous phase outlet, liquefaction ice chest, the domethanizing column upper entrance of separator pass sequentially through pipeline connection；The gas of the hydrocarbon liquid/gas separator Mutually outlet and liquid-phase outlet are connected by pipeline with domethanizing column top and centre entrance respectively.
- A kind of 3. device of ethane recovery co-production of liquefied natural gas according to claim 1, it is characterised in that：The liquefaction Ice chest, demethanizer reflux pump and demethanizer overhead entrance are sequentially connected.
- A kind of 4. device of ethane recovery co-production of liquefied natural gas according to claim 1, it is characterised in that：The liquefaction Ice chest centre exit, second throttle and liquefaction ice chest centre inlet are sequentially connected.
- A kind of 5. device of ethane recovery co-production of liquefied natural gas according to claim 4, it is characterised in that：The liquefaction Ice chest outlet at bottom, the 3rd choke valve and liquefaction ice chest bottom inlet are sequentially connected.
- A kind of 6. device of ethane recovery co-production of liquefied natural gas according to claim 4, it is characterised in that：The piptonychia Alkane tower is plate column or packed tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720399716.2U CN206666414U (en) | 2017-04-17 | 2017-04-17 | A kind of device of ethane recovery co-production of liquefied natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720399716.2U CN206666414U (en) | 2017-04-17 | 2017-04-17 | A kind of device of ethane recovery co-production of liquefied natural gas |
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| Publication Number | Publication Date |
|---|---|
| CN206666414U true CN206666414U (en) | 2017-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720399716.2U Active CN206666414U (en) | 2017-04-17 | 2017-04-17 | A kind of device of ethane recovery co-production of liquefied natural gas |
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| Country | Link |
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| CN (1) | CN206666414U (en) |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180116 Address after: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee after: China Petroleum Engineering Construction Co Ltd Address before: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee before: Engineering Design Co., Ltd., China Petroleum Group |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210224 Address after: No.2 Daqing East Road, Dushanzi District, Karamay City, Xinjiang Uygur Autonomous Region 834000 Patentee after: CNPC Engineering Co.,Ltd. Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |