CN101504244B - Ice box used for natural gas liquefaction system - Google Patents
Ice box used for natural gas liquefaction system Download PDFInfo
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- CN101504244B CN101504244B CN2009101033730A CN200910103373A CN101504244B CN 101504244 B CN101504244 B CN 101504244B CN 2009101033730 A CN2009101033730 A CN 2009101033730A CN 200910103373 A CN200910103373 A CN 200910103373A CN 101504244 B CN101504244 B CN 101504244B
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- knockout drum
- natural gas
- liquified natural
- outlet
- gas
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000003345 natural gas Substances 0.000 title claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 230000008676 import Effects 0.000 claims description 32
- 238000005057 refrigeration Methods 0.000 claims description 19
- 241000628997 Flos Species 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 4
- 239000002912 waste gas Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- JVFDADFMKQKAHW-UHFFFAOYSA-N C.[N] Chemical compound C.[N] JVFDADFMKQKAHW-UHFFFAOYSA-N 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003949 liquefied natural gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention discloses a cold box for a natural gas liquefaction system, which comprises a precooling unit (1), a first separation tank (2), a second separation tank (3), a third separation tank (4) and a fourth separation tank (5); a first ejector (6) is connected to a passage between a feed gas outlet (1a) and a gas-liquid mixing inlet (2a) of the first separation tank; and a connecting channel is formed between a gas-liquid mixing inlet (3b) of the second separation tank and the feed gas outlet (1a), and is provided with a second ejector (7). The invention aims to provide a cold box for the natural gas liquefaction system, which has simple structure and small energy consumption and can process less than 300,000 cubic meters of natural gas daily.
Description
Technical field
The utility model belongs to the gas liquefaction system technical field, specifically, relates to a kind of ice chest that is used for natural gas liquefaction system.
Background technology
Present natural gas liquefaction device in the world, its liquefaction cycle is mainly: stepwise kind of refrigeration cycle, azeotrope kind of refrigeration cycle and expander refrigeration circulation.These mode majorities are useful in the type high throughput liquefied natural gas of base, are used in day following situation energy consumption height of processing 30 ten thousand stere natural gases, handle how 300,000 side's natural gases are following circulates with expander refrigeration in domestic day.The expander refrigeration circulation is meant the flow process of the Cloud's circularly cooling realization natural gas liquefaction that utilizes high-pressure refrigerant to pass through the turbo-expander adiabatic expansion.Usually adopt nitrogen, nitrogen-methane, natural gas as cold-producing medium in this expander refrigeration circulation.
The necessary all depth dryings of the air-flow of feeder in the expander refrigeration circulation; Return pressure is low, and heat exchange area is big, and the energy consumption that liquefies entirely is higher.
The expander refrigeration circulation exists following weak point:
1, refrigerating plant complex structure, volume are big, and operation is complicated;
Equipment need run up when 2, refrigeration plant was worked, and caused system reliability relatively poor;
3, a liquefied fraction of expander refrigeration circulation is lower, and theoretical numerical value is between 8%-12%, usually about 9%; Therefore full liquefaction energy consumption is higher.
4, the natural gas impurities is removed and is normally taken away impurity by discharging a large amount of natural gases in the expander refrigeration circulation;
5, the pressure size requirements at raw natural gas is generally between the 80%-100% of design pressure size in the expander refrigeration circulation, and is less between the work elastic region.
6, expander refrigeration circulates in the starting up needs 1-3 days time usually to the ordinary production time.
The utility model content
For solving above technical problem, the purpose of this utility model is to provide day handles 30 ten thousand stere natural gases following a kind of simple in structure, the ice chest that is used for natural gas liquefaction system that energy consumption is little.
The technical solution of the utility model is as follows:
A kind of ice chest that is used for natural gas liquefaction system, comprise precooling unit, first knockout drum, second knockout drum, the 3rd knockout drum and the 4th knockout drum, described precooling unit has raw material gas inlet, unstripped gas outlet, circulating air import and circulating air outlet, described first knockout drum be arranged on the circulating air path between unstripped gas outlet and the circulating air import described unstripped gas export and the described first knockout drum gas-liquid mixed import between path on be connected with first injector, this first injector injection end is connected with the described second knockout drum gas phase end; The liquified natural gas import of described second knockout drum links to each other with the outlet of the liquified natural gas of first knockout drum, between described second knockout drum gas-liquid mixed import and the outlet of described unstripped gas, form interface channel, this interface channel is provided with second injector, and the injection end of this second injector links to each other with described the 3rd knockout drum gas phase end; The liquified natural gas import of described the 3rd knockout drum links to each other with the outlet of the liquified natural gas of described second knockout drum, the circulating air air inlet of described the 3rd knockout drum be connected in the circulating air import and described first knockout drum circulating air outlet between on the path that forms, be provided with the flush type heat exchanger tube in described the 3rd knockout drum, this flush type heat exchanger tube is communicated with the circulating air air inlet of the 3rd knockout drum and the gas-liquid mixed outlet of the 3rd knockout drum, and the gas-liquid mixed outlet of the 3rd knockout drum is connected in described the 4th knockout drum gas-liquid mixed import; Be respectively arranged with the outlet of the 3rd knockout drum liquified natural gas floss hole and the 4th knockout drum liquified natural gas on described the 3rd knockout drum and the 4th knockout drum, wherein also be provided with Waste gas outlet at the top of the 4th knockout drum.
Described precooling unit is made up of first heat exchanger, refrigeration machine forecooler and second heat exchanger, described first heat exchanger and second heat exchanger are connected in series and form circulation canal by the circulation pipeline, and described refrigeration machine forecooler is arranged on the intake channel between first heat exchanger and second heat exchanger.
Also be provided with liquified natural gas discharging branch road on the passage that links to each other of the liquified natural gas import of described the 3rd knockout drum and the liquified natural gas outlet of described second knockout drum, this branch road is provided with gauge tap.
On the path that the liquified natural gas import that the outlet of described the 4th knockout drum liquified natural gas is connected to described second knockout drum and the liquified natural gas of first knockout drum export.The 3rd knockout drum liquified natural gas floss hole is connected on the described liquified natural gas discharging branch road.All be connected with the dump pipe in the liquified natural gas outlet of first knockout drum, liquified natural gas outlet, the 3rd knockout drum liquified natural gas floss hole and the outlet of the 4th knockout drum liquified natural gas of second knockout drum.
Beneficial effect:
1), ice chest realizes skidization, structural volume is little, easy for installation; Injector is simple in structure, fortune not
Dynamic component, so system reliability height;
2), easy to operate, the plant maintenance amount is few, the Operation and Maintenance personnel are few;
3), liquefied fraction is very high, one time liquefied fraction reaches 33%, helium separates discharge with most foreign gases such as hydrogen by the flush type heat exchanger in the 4th knockout drum;
4), the work elasticity of ice chest is big, under the 50%-120% of design pressure, can both work.
5), startup-shutdown simple, start-up time was to operate as normal only 20 minutes.
Description of drawings
Fig. 1 is a structure principle chart of the present utility model;
Fig. 2 is the structural representation that adopts the same structure knockout drum in the utility model;
Fig. 3 is the structural representation of heat exchanger in the utility model;
Fig. 4 is the structural representation of first injector in the utility model;
Fig. 5 is the structural representation of second injector in the utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Embodiment, as Fig. 1,2,3,4, shown in 5: a kind of ice chest that is used for natural gas liquefaction system, comprise precooling unit 1, first knockout drum 2, second knockout drum 3, the 3rd knockout drum 4 and the 4th knockout drum 5, described precooling unit 1 has raw material gas inlet 1c, unstripped gas outlet 1a, circulating air import 1b and circulating air outlet 1d, described first knockout drum 2 is arranged on the circulating air path between unstripped gas outlet 1a and the circulating air import 1b, on the path between described unstripped gas outlet 1a and the described first knockout drum gas-liquid mixed import 2a, be connected with first injector 6, the air inlet 6b of this first injector links to each other with unstripped gas outlet 1a, gas outlet 6c links to each other with the first knockout drum gas-liquid mixed import 2a, and injection end 6a is connected with the described second knockout drum gas phase end 3a; The liquified natural gas import 3c of described second knockout drum links to each other with the liquified natural gas of first knockout drum outlet 2b, between described second knockout drum gas-liquid mixed import 3b and described unstripped gas outlet 1a, form interface channel, this interface channel is provided with second injector 7, the injection end 7a of this second injector 7 links to each other with described the 3rd knockout drum gas phase end 4a, the air inlet 7b of second injector links to each other with unstripped gas outlet 1a, gas outlet 7c links to each other with the second knockout drum gas-liquid mixed import 3b, link to each other with the liquified natural gas outlet 3d of described second knockout drum with the liquified natural gas import 4b of described the 3rd knockout drum, the circulating air air inlet 4c of described the 3rd knockout drum is connected on the path that forms between the last and described first knockout drum circulating air outlet of the circulating air import 1b 2c, be provided with flush type heat exchanger tube 8 in described the 3rd knockout drum 4, this flush type heat exchanger tube 8 is communicated with the circulating air air inlet 4c of the 3rd knockout drum and the gas-liquid mixed outlet 4d of the 3rd knockout drum, and the gas-liquid mixed outlet 4d of the 3rd knockout drum is connected on described the 4th knockout drum gas-liquid mixed import 5a; Be respectively arranged with the 3rd knockout drum liquified natural gas floss hole 4e and the 4th knockout drum liquified natural gas outlet 5b on described the 3rd knockout drum 4 and the 4th knockout drum 5, wherein also be provided with Waste gas outlet 5c at the top of the 4th knockout drum 5.
Described precooling unit 1 is made up of the first heat exchanger 1e, refrigeration machine forecooler 1f and the second heat exchanger 1g, the described first heat exchanger 1e and the second heat exchanger 1g are connected in series and form circulation canal by the circulation pipeline, and described refrigeration machine forecooler 1f is arranged on the intake channel between the first heat exchanger 1e and the second heat exchanger 1g.
Also be provided with liquified natural gas discharging branch road on the passage that links to each other of the liquified natural gas import 4b of described the 3rd knockout drum and the liquified natural gas outlet 3d of described second knockout drum, this branch road is provided with gauge tap 9.
Described the 4th knockout drum liquified natural gas outlet 5b is connected to the liquified natural gas import 3c of described second knockout drum and the liquified natural gas of first knockout drum exports on the path of 2b.The 3rd knockout drum liquified natural gas floss hole 4e is connected on the described liquified natural gas discharging branch road.All be connected with dump pipe 10 at the liquified natural gas outlet 2b of first knockout drum, liquified natural gas outlet 3d, the 3rd knockout drum liquified natural gas floss hole 4e and the 4th knockout drum liquified natural gas outlet 5b of second knockout drum.
What above-mentioned four knockout drums all adopted is the knockout drum of same structure, and each knockout drum has been applied to different interfaces as the case may be.
Operation principle of the present utility model is:
Through compression unit natural pressure is reduced to 10-20MPa, this natural gas enters the precooling unit from the raw material air inlet of precooling unit, make the Compressed Gas temperature from about the 30 ℃ chambers that are reduced to about-70 ℃ and enter first injector, effect by first injector cools to about-120 ℃ gases at high pressure rapidly, pressure is reduced to the liquefaction of rear section, the 0.6-1.5Mpa left and right sides and enters first knockout drum, Ye Hua gas does not then return the precooling unit from the outlet of the first knockout drum circulating air, that utilizes that this returns carries out heat exchange than cold air to entering gas, to reach the effect of heat exchange.Ye Hua gas is not got back to compression unit and is formed a cyclic process after overcompression enters the precooling unit once more.
Wherein, the action principle of injector is: utilize the gases at high pressure 10-25MPa that enters chamber to mix as passive stream as the low-pressure gas 0.5-1MPa that initiatively flows with second knockout drum provides, low-pressure gas injection gases at high pressure expand rapidly in the chamber of injector and lower the temperature, temperature is reduced to-110 ℃ to about-130 ℃, pressure is reduced to 0.6-1.5Mpa, makes the gases at high pressure partial liquefaction that enters.
Be stored in first knockout drum liquified natural gas can by and second knockout drum between pipeline flow into second knockout drum, the liquified natural gas that stores in second knockout drum then can by and the 3rd knockout drum between pipeline enter the 3rd knockout drum or directly enter storage tank by discharging branch road.
Same principle: utilize the ejector action of second injector that Compressed Gas can part directly be liquefied in second knockout drum, liquid gas directly enters storage tank or enters the 3rd knockout drum.
In the 3rd knockout drum, be provided with the flush type heat exchanger tube, this flush type heat exchanger tube be with aforementioned circulating air passage in the not gas of liquefaction that flowed out through first knockout drum can enter the flush type heat exchanger tube by the control of switch, because deposit has colder liquified natural gas in the 3rd knockout drum itself, and the flush type heat exchanger tube is in wherein, flow through the gas that this flush type heat exchanger tube is not liquefied and under the effect of colder liquified natural gas, be liquefied, and enter the 4th knockout drum.And those impurity that need colder temperature just can be liquefied then enter the 4th knockout drum and discharge by exhaust outlet as hydrogen, helium, nitrogen.
Be provided with the liquified natural gas outlet at the 3rd knockout drum, the 4th separator tube equally, so that enter storage tank.
In addition, be provided with the dump pipe, control by switch at the outlet end of four knockout drums.
Claims (6)
1. ice chest that is used for natural gas liquefaction system, comprise precooling unit (1), first knockout drum (2), second knockout drum (3), the 3rd knockout drum (4) and the 4th knockout drum (5), described precooling unit (1) has raw material gas inlet (1c), unstripped gas outlet (1a), circulating air import (1b) and circulating air outlet (1d), described first knockout drum (2) is arranged on the circulating air path between unstripped gas outlet (1a) and the circulating air import (1b), it is characterized in that: be connected with first injector (6) on the path between described unstripped gas outlet (1a) and the described first knockout drum gas-liquid mixed import (2a), this first injector injection end (6a) is connected with the described second knockout drum gas phase end (3a); The liquified natural gas import (3c) of described second knockout drum links to each other with the liquified natural gas of first knockout drum outlet (2b), between described second knockout drum gas-liquid mixed import (3b) and described unstripped gas outlet (1a), form interface channel, this interface channel is provided with second injector (7), and the injection end (7a) of this second injector (7) links to each other with described the 3rd knockout drum gas phase end (4a); The liquified natural gas import (4b) of described the 3rd knockout drum links to each other with the liquified natural gas of described second knockout drum outlet (3d), the circulating air air inlet (4c) of described the 3rd knockout drum is connected on the path that forms between the last and described first knockout drum circulating air outlet of circulating air import (1b) (2c), be provided with flush type heat exchanger tube (8) in described the 3rd knockout drum (4), this flush type heat exchanger tube (8) is communicated with the circulating air air inlet (4c) of the 3rd knockout drum and the gas-liquid mixed outlet (4d) of the 3rd knockout drum, and the gas-liquid mixed outlet (4d) of the 3rd knockout drum is connected in described the 4th knockout drum gas-liquid mixed import (5a); Be respectively arranged with the 3rd knockout drum liquified natural gas floss hole (4e) and the 4th knockout drum liquified natural gas outlet (5b) on described the 3rd knockout drum (4) and the 4th knockout drum (5), wherein also be provided with Waste gas outlet (5c) at the top of the 4th knockout drum (5).
2. a kind of ice chest that is used for natural gas liquefaction system according to claim 1, it is characterized in that: described precooling unit (1) is made up of first heat exchanger (1e), refrigeration machine forecooler (1f) and second heat exchanger (1g), described first heat exchanger (1e) and second heat exchanger (1g) are connected in series and form circulation canal by the circulation pipeline, and described refrigeration machine forecooler (1f) is arranged on the intake channel between first heat exchanger (1e) and second heat exchanger (1g).
3. a kind of ice chest that is used for natural gas liquefaction system according to claim 1, it is characterized in that: also be provided with liquified natural gas discharging branch road on the passage that links to each other of the liquified natural gas outlet (3d) of the liquified natural gas import (4b) of described the 3rd knockout drum and described second knockout drum, this branch road is provided with gauge tap (9).
4. a kind of ice chest that is used for natural gas liquefaction system according to claim 1 is characterized in that: described the 4th knockout drum liquified natural gas outlet (5b) is connected to the liquified natural gas import (3c) of described second knockout drum and the liquified natural gas of first knockout drum exports on the path of (2b).
5. a kind of ice chest that is used for natural gas liquefaction system according to claim 3 is characterized in that: the 3rd knockout drum liquified natural gas floss hole (4e) is connected on the described liquified natural gas discharging branch road.
6. a kind of ice chest that is used for natural gas liquefaction system according to claim 1 is characterized in that: all be connected with dump pipe (10) in the liquified natural gas outlet (2b) of first knockout drum, liquified natural gas outlet (3d), the 3rd knockout drum liquified natural gas floss hole (4e) and the 4th knockout drum liquified natural gas outlet (5b) of second knockout drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101033730A CN101504244B (en) | 2009-03-13 | 2009-03-13 | Ice box used for natural gas liquefaction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101033730A CN101504244B (en) | 2009-03-13 | 2009-03-13 | Ice box used for natural gas liquefaction system |
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| CN101504244A CN101504244A (en) | 2009-08-12 |
| CN101504244B true CN101504244B (en) | 2011-02-16 |
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| CN2009101033730A Expired - Fee Related CN101504244B (en) | 2009-03-13 | 2009-03-13 | Ice box used for natural gas liquefaction system |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102504901A (en) * | 2011-11-03 | 2012-06-20 | 苏州市兴鲁空分设备科技发展有限公司 | Method for liquefying natural gas |
| CN102661653A (en) * | 2012-05-16 | 2012-09-12 | 重庆华瑞石化股份有限公司 | Natural gas liquefied high-pressure throttling technology with ejector |
| CN104806879A (en) * | 2015-04-22 | 2015-07-29 | 四川金科深冷设备工程有限公司 | BOG recovery system for LNG (Liquefied Natural Gas) gas station |
| CN107560317A (en) | 2016-06-30 | 2018-01-09 | 通用电气公司 | System and method for producing liquefied natural gas |
| CN107702430B (en) * | 2017-09-20 | 2019-12-24 | 国鸿液化气机械工程（大连）有限公司 | Ship reliquefaction system and method |
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| US4055961A (en) * | 1973-08-21 | 1977-11-01 | U.S. Philips Corporation | Device for liquefying gases |
| CN2315506Y (en) * | 1997-10-27 | 1999-04-21 | 中国科学院低温技术实验中心 | A multi-stage throttling natural gas liquefaction device |
| CN2684119Y (en) * | 2004-03-17 | 2005-03-09 | 唐德中 | High efficiency energy saving consumption reducing machine |
| CN201028930Y (en) * | 2007-04-28 | 2008-02-27 | 重庆大山燃气设备有限公司 | Natural gas liquefaction device |
| CN101135506A (en) * | 2007-10-10 | 2008-03-05 | 中国船舶重工集团公司第七一一研究所 | Middle and small mixed working substance natural gas liquefaction cooling cycle system with injector |
| CN201377960Y (en) * | 2009-03-13 | 2010-01-06 | 重庆四联油气设备制造有限公司 | Cold box for natural gas liquefying system |
-
2009
- 2009-03-13 CN CN2009101033730A patent/CN101504244B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4055961A (en) * | 1973-08-21 | 1977-11-01 | U.S. Philips Corporation | Device for liquefying gases |
| CN2315506Y (en) * | 1997-10-27 | 1999-04-21 | 中国科学院低温技术实验中心 | A multi-stage throttling natural gas liquefaction device |
| CN2684119Y (en) * | 2004-03-17 | 2005-03-09 | 唐德中 | High efficiency energy saving consumption reducing machine |
| CN201028930Y (en) * | 2007-04-28 | 2008-02-27 | 重庆大山燃气设备有限公司 | Natural gas liquefaction device |
| CN101135506A (en) * | 2007-10-10 | 2008-03-05 | 中国船舶重工集团公司第七一一研究所 | Middle and small mixed working substance natural gas liquefaction cooling cycle system with injector |
| CN201377960Y (en) * | 2009-03-13 | 2010-01-06 | 重庆四联油气设备制造有限公司 | Cold box for natural gas liquefying system |
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| CN101504244A (en) | 2009-08-12 |
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