CN206919522U - A kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel - Google Patents
A kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel Download PDFInfo
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- CN206919522U CN206919522U CN201720680222.1U CN201720680222U CN206919522U CN 206919522 U CN206919522 U CN 206919522U CN 201720680222 U CN201720680222 U CN 201720680222U CN 206919522 U CN206919522 U CN 206919522U
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Abstract
The utility model discloses a kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel, including ethane evaporation air circuit, three stage compression azeotrope refrigerating circuit, ethane evaporation air circuit and the refrigerating circuit of three stage compression azeotrope carry out the ethane evaporation gas liquefaction that exchanges heat by heat exchanger.Ethane evaporation air circuit includes BOG compressors, the refrigerating circuit of three stage compression azeotrope include low voltage refrigeration compressor, middle compacting cold compressor, high-pressure refrigeration compressor, low pressure recycle choke valve, Medium pressure cycle choke valve, cycle of higher pressure choke valve, in calm the anger liquid/gas separator, high-pressure gas-liquid separator, condenser is housed between cycle of higher pressure choke valve and high-pressure refrigeration compressor.Set gradually after heat exchanger and BOG choke valves and BOG gas-liquid separators are installed.Liquefied ethane boil-off gas reliquefaction installation peculiar to vessel of the present utility model, it can reclaim and using ethane boil-off gas, avoid the waste of ethane.
Description
Technical field
A kind of boil-off gas reliquefaction installation is the utility model is related to, particularly a kind of liquefied ethane boil-off gas peculiar to vessel is re-liquefied
Device.
Background technology
Ethane cracking is to produce the important source material of ethene, and ethylene industry is the tap of petrochemical industry, is to weigh a state
Family's scale of petrochemical industry and the mark of development degree.Under normal pressure, the liquefied ethane etc. weight is the 1/435 of gaseous ethane, because
This is in the marine trade of ethane, after typically ethane is liquefied, is transported using low temperature storing tank and special liquefied gas carrier.Liquid
Change gas tanker to keep the temperature conditionss of Low Temperature Liquid goods, hull and storage tank there must be good heat-proof quality.But due to interior
The outer temperature difference is very big, and provision for thermal insulation is good again also unavoidably to have external heat to leak into cargo tank, in addition rocking during shipping agency
Also heat can be produced, and then produces boil-off gas (BOG).The generation of boil-off gas can make the pressure rise of cargo tank, too high pressure
Power is unfavorable for navigation safety, thus certain measure must be taken to handle BOG.
Partial liquefaction gas ship is using directly emptying or torch burning, such processing mode both not environmentally or wasted energy
Source, cause very big economic loss.Therefore the caused re-liquefied recovery of BOG during navigating by water, it appears necessary.
Utility model content
Purpose of utility model：The purpose of this utility model is to solve deficiency of the prior art, there is provided one kind can
Applied on LEG ships, so as to realize effective recovery of ethane boil-off gas, avoid waste of resource, the liquid peculiar to vessel to eliminate safe hidden trouble
Change ethane boil-off gas reliquefaction installation.
Technical scheme：A kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel described in the utility model, including ethane steam
Get angry loop, three stage compression azeotrope refrigerating circuit, ethane evaporation air circuit and three stage compression azeotrope refrigerating circuit are led to
Cross heat exchanger and carry out heat exchange so that ethane evaporation gas liquefaction.
Further, ethane evaporation air circuit includes BOG compressors, and BOG compressors carry out two stages of compression to BOG gases.
Further, the refrigerating circuit of three stage compression azeotrope includes low pressure recycle, Medium pressure cycle, cycle of higher pressure, low pressure
Low voltage refrigeration compressor is provided with circulation, middle compacting cold compressor is provided with Medium pressure cycle, high-pressure refrigeration is provided with cycle of higher pressure
Azeotrope is compressed to height by compressor, low voltage refrigeration compressor, middle compacting cold compressor, high-pressure refrigeration compressor from low pressure
Pressure.
Further optimize, be separately installed with low pressure recycle, Medium pressure cycle, cycle of higher pressure for realizing azeotrope section
Flow the low pressure recycle choke valve, Medium pressure cycle choke valve, cycle of higher pressure choke valve of decompression.
It is further preferred that equipped with condensation between cycle of higher pressure choke valve and high-pressure refrigeration compressor in cycle of higher pressure
Device.
Further optimize,
Calmed the anger in being provided with Medium pressure cycle liquid/gas separator, in calm the anger liquid/gas separator will middle compression refrigerant gas be sent into press
Circulation blender after the gas mixing after low voltage refrigeration compressor compresses with being fed again into middle compacting cold compressor；
High-pressure gas-liquid separator is provided with cycle of higher pressure, higher pressure refrigerant gas is sent into high pressure by high-pressure gas-liquid separator
Circulation blender after the gas mixing after middle compacting cold compressor compression with being fed again into high-pressure refrigeration compressor.
Further, set gradually after heat exchanger and BOG choke valves and BOG gas-liquid separators are installed.
Beneficial effect：The utility model evaporates air circuit and three stage compression azeotrope refrigerating circuit in heat exchange by ethane
Exchanged heat in device, cold is passed to ethane boil-off gas by azeotrope in heat exchanger, realizes the liquefaction of ethane.Due to using
Said structure, azeotrope produces cold energy after three stage compression circulation pressurization, condensation throttling, after can be used for pressurization
BOG liquefaction recycling.The effect of heat exchanger is exactly by the cold transmission of the azeotrope after pressurized condensation and the cooling that throttles
Give ethane boil-off gas.And BOG compressors carry out two stages of compression to BOG gases, the high pressure ethane boil-off gas after pressurization is exchanging heat
Cool down and liquefy in device.
Three stage compression azeotrope refrigerating circuit of the present utility model, azeotrope is in high-pressure refrigeration compressor compresses to height
After pressure, cooled down into condenser, the high pressure mixing cryogen after cooling enters by the throttling of cycle of higher pressure choke valve, decompression, cooling
Heat exchanger enters high-pressure gas-liquid separator after absorbing high pressure BOG heat, and isolated gases at high pressure mix into cycle of higher pressure
Clutch, the azeotrope come with middle compacting cold compressor are sent into high-pressure refrigeration compressor after mixing；Isolated highly pressurised liquid
By throttling again, decompression, cooling, high pressure BOG is further cooled down into heat exchanger.After heat exchanger absorbs heat, mix
Liquid/gas separator of calming the anger is closed during cryogen enters, and isolated medium pressure gas enters Medium pressure cycle blender, is compressed with low voltage refrigeration
Cold compressor is suppressed in being sent into after the azeotrope mixing that machine comes；Isolated middle press liquid is by throttling again, drop
Pressure, coolings, last cooling, liquefaction are carried out to high pressure BOG into heat exchanger, the azeotrope after heat is absorbed and completely vaporizes,
It is sent into low voltage refrigeration compressor to be compressed, starts new circulation.As a result of said structure, the cooling to ethane boil-off gas
Liquefaction divide into three parts, can reduce the heat transfer temperature difference between azeotrope and BOG, improve heat exchange efficiency.
BOG choke valves are provided with heat exchanger exit of the present utility model so that ethane is further depressured cooling, will absorb
BOG gas-liquid separators are sent into after cold liquefied high pressure BOG reducing pressure by regulating flow, the liquefied ethane separated sends storage tank back to, point
The gaseous ethane come is separated out then to discharge, as ship's navigation fuel or send BOG suctions port of compressor back to and liquefied again.
In summary, liquefied ethane boil-off gas reliquefaction installation peculiar to vessel of the present utility model, can reclaim and utilize ethane
Boil-off gas, avoid the waste of ethane.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Drawing reference numeral：1st, BOG compressors, 2, high-pressure gas-liquid separator, 3, cycle of higher pressure choke valve, 4, cycle of higher pressure mixing
Device, 5, condenser, 6, high-pressure refrigeration compressor, 7, Medium pressure cycle blender, 8, middle compacting cold compressor, 9, low voltage refrigeration compression
Machine, 10, low pressure recycle choke valve, 11, BOG choke valves, 12, BOG gas-liquid separators, 13, heat exchanger, 14, middle pressure gas-liquid separation
Device, 15, Medium pressure cycle choke valve.
Embodiment
Embodiment of the present utility model is illustrated by particular specific embodiment below, those skilled in the art can be by this
Content disclosed by specification understands other advantages and effect of the present utility model easily.
As shown in figure 1, a kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel, including ethane evaporation air circuit, three-level pressure
Contracting azeotrope refrigerating circuit, ethane evaporation air circuit and the refrigerating circuit of three stage compression azeotrope are changed by heat exchanger 13
Heat causes ethane evaporation gas liquefaction.
As the further optimization to the technical program, ethane evaporation air circuit includes BOG compressors 1, BOG compressors 1
Two stages of compression is carried out to BOG gases.The refrigerating circuit of three stage compression azeotrope includes low pressure recycle, Medium pressure cycle, cycle of higher pressure,
Low voltage refrigeration compressor 9 is provided with low pressure recycle, middle compacting cold compressor 8 is provided with Medium pressure cycle, height is provided with cycle of higher pressure
Cold compressor 6 is suppressed, low voltage refrigeration compressor 9, middle compacting cold compressor 8, high-pressure refrigeration compressor 6 are by azeotrope from low pressure
It is compressed to high pressure.It is separately installed with low pressure recycle, Medium pressure cycle, cycle of higher pressure for realizing the low of azeotrope reducing pressure by regulating flow
Pressure circulation choke valve 10, Medium pressure cycle choke valve 15, cycle of higher pressure choke valve 3.The He of cycle of higher pressure choke valve 3 in cycle of higher pressure
Condenser 5 is housed between high-pressure refrigeration compressor 6.
Calmed the anger in being provided with Medium pressure cycle liquid/gas separator 14, in liquid/gas separator 14 of calming the anger middle compression refrigerant gas is sent into
Medium pressure cycle blender 7 after the gas mixing after the compression of low voltage refrigeration compressor 9 with being fed again into middle compacting cold compressor 8；
High-pressure gas-liquid separator 2 is provided with cycle of higher pressure, higher pressure refrigerant gas is sent into high by high-pressure gas-liquid separator 2
Pressure circulation blender 4 after the gas mixing after middle compacting cold compressor 8 compression with being fed again into high-pressure refrigeration compressor 6.
Set gradually after heat exchanger 13 and BOG choke valves 11 and BOG gas-liquid separators 12 are installed.
The utility model evaporates air circuit by ethane and the refrigerating circuit of three stage compression azeotrope is entered in heat exchanger 13
Cold is passed to ethane boil-off gas in heat exchanger 13, realizes the liquefaction of ethane by row heat exchange, azeotrope.As a result of upper
Structure is stated, azeotrope produces cold energy after three stage compression circulation pressurization, condensation throttling, the BOG's that can be used for after pressurization
Liquefy recycling.The effect of heat exchanger 13 is exactly that the cold of the azeotrope after pressurized condensation and the cooling that throttles is passed into second
Alkane boil-off gas.And BOG compressors 1 carry out two stages of compression to BOG gases, the high pressure ethane boil-off gas after pressurization is in heat exchanger 13
Middle cooling is simultaneously liquefied.
Three stage compression azeotrope refrigerating circuit of the present utility model, azeotrope are compressed in high-pressure refrigeration compressor 6
After high pressure, being cooled down into condenser 5, the high pressure mixing cryogen after cooling throttles, is depressured, cooled by cycle of higher pressure choke valve 3,
Enter high-pressure gas-liquid separator 2 after absorbing high pressure BOG heat into heat exchanger 13, isolated gases at high pressure enter high pressure
Circulation blender 4, high-pressure refrigeration compressor 6 is sent into after being mixed with the azeotrope of middle compacting cold compressor 8；Isolated
Highly pressurised liquid further cools down high pressure BOG by throttling, decompression, cooling again into heat exchanger 13.Inhaled in heat exchanger 13
After receiving heat, liquid/gas separator 14 of being calmed the anger in azeotrope entrance, isolated medium pressure gas enters Medium pressure cycle blender 7,
Cold compressor 8 is suppressed in being sent into after being mixed with the azeotrope of low voltage refrigeration compressor 9；Isolated middle press liquid passes through
Throttling, decompression, cooling again, last cooling, liquefaction are carried out to high pressure BOG into heat exchanger 13, after absorbing heat
Azeotrope completely vaporizes, and is sent into low voltage refrigeration compressor 9 and is compressed, starts new circulation.As a result of said structure,
Cooling liquid to ethane boil-off gas divide into three parts, can reduce the heat transfer temperature difference between azeotrope and BOG, improve
Heat exchange efficiency.
The exit of heat exchanger 13 of the present utility model is provided with BOG choke valves 11 so that ethane is further depressured cooling, will
BOG gas-liquid separators 12 are sent into after absorbing the liquefied high pressure BOG reducing pressure by regulating flow of cold, the liquefied ethane separated sends storage back to
Tank, the gaseous ethane separated then are discharged, as ship's navigation fuel or send the entrance of BOG compressors 1 back to and enter again
Row liquefaction.
Operation principle of the present utility model is that ethane evaporates air circuit and three stage compression azeotrope refrigerating circuit in heat exchange
Exchanged heat in device 13.When on LEG ships due to leakage heat, the reason such as rock and produce BOG, reach certain pressure in storage tank, then BOG
The valve of house steward is opened, and is discharged certain BOG and is sent into BOG compressors 1, after two stages of compression, into the precooling of heat exchanger 13,
In this heat exchanger 13, with high pressure BOG heat exchange be through cycle of higher pressure choke valve 3 condensation throttling high pressure mixing cryogen, high pressure
BOG obtains preliminary cooling.The azeotrope for absorbing high pressure BOG heats is admitted to high-pressure gas-liquid separator 2 through pipeline, mixing
Cryogen is divided into two strands, and one gas mixing cryogen is sent into cycle of higher pressure blender 4 and middle compacting cold compressor 8 conveys mix
After closing cryogen mixing, high-pressure refrigeration compressor 6 is sent into together；Another strand of liquid azeotrope saves by Medium pressure cycle choke valve 15
Enter heat exchanger 13 after stream, cooling, decompression, and BOG is further exchanged heat, BOG obtains further cooling down, mixing
Liquid/gas separator 14 of being calmed the anger in cryogen entrance is separated into two strands, and one gas mixing cryogen is sent into Medium pressure cycle blender 7 and low pressure
After the azeotrope mixing that the conveying of refrigeration compressor 9 comes, cold compressor 8 is suppressed in being sent into together；Another strand of liquid azeotrope
Enter heat exchanger 13 after throttling, cool, be depressured, last cooling, condensation are carried out to BOG.Complete the azeotrope of heat exchange
Gas is fully converted to, low voltage refrigeration compressor 9 is sent into through pipeline, starts new pressurized refrigerant circulation；And BOG is then by cold again
It is solidifying, throttle, be depressured after BOG choke valves 11, be admitted to BOG gas-liquid separators 12, the ethane being liquefied finally is sent back to LEG
The storage tank of ship, is still within gaseous ethane and can be sent to the entrance of BOG compressors 1 undergoing again re-liquefied, can be used for
The fuel of ship.
In summary, liquefied ethane boil-off gas reliquefaction installation peculiar to vessel of the present utility model, can reclaim and utilize ethane
Boil-off gas, avoid the waste of ethane.
Above-mentioned embodiment, only illustrate technical concept and architectural feature of the present utility model, it is therefore intended that allow ripe
Knowing the stakeholder of technique can implement according to this, but above content is not intended to limit the scope of protection of the utility model, every
Any equivalent change or modification made according to Spirit Essence of the present utility model, all should fall into the scope of protection of the utility model
Within.For example, a kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel described in the utility model, is equally applicable to liquefied ethylene
It is re-liquefied.
Claims (7)
- A kind of 1. liquefied ethane boil-off gas reliquefaction installation peculiar to vessel, it is characterised in that：Including ethane evaporation air circuit, three stage compression Azeotrope refrigerating circuit, the ethane evaporation air circuit and the refrigerating circuit of three stage compression azeotrope are entered by heat exchanger (13) Row heat exchange causes ethane evaporation gas liquefaction.
- A kind of 2. liquefied ethane boil-off gas reliquefaction installation peculiar to vessel according to claim 1, it is characterised in that：The ethane Evaporation air circuit includes BOG compressors (1), and the BOG compressors (1) carry out two stages of compression to BOG gases.
- A kind of 3. liquefied ethane boil-off gas reliquefaction installation peculiar to vessel according to claim 1, it is characterised in that：The three-level Compressing azeotrope refrigerating circuit includes low pressure recycle, Medium pressure cycle, cycle of higher pressure, and low voltage refrigeration is provided with the low pressure recycle Compressor (9), is provided with middle compacting cold compressor (8) in medium pressure circulation, being provided with high-pressure refrigeration in the cycle of higher pressure compresses Machine (6), the low voltage refrigeration compressor (9), middle compacting cold compressor (8), high-pressure refrigeration compressor (6) are by azeotrope from low It is compressed to high pressure.
- A kind of 4. liquefied ethane boil-off gas reliquefaction installation peculiar to vessel according to claim 3, it is characterised in that：The low pressure The low pressure recycle choke valve for realizing azeotrope reducing pressure by regulating flow is separately installed with circulation, Medium pressure cycle, cycle of higher pressure (10), Medium pressure cycle choke valve (15), cycle of higher pressure choke valve (3).
- A kind of 5. liquefied ethane boil-off gas reliquefaction installation peculiar to vessel according to claim 4, it is characterised in that：The high pressure Condenser (5) is housed between the cycle of higher pressure choke valve (3) and high-pressure refrigeration compressor (6) in circulation.
- A kind of 6. liquefied ethane boil-off gas reliquefaction installation peculiar to vessel according to claim 3, it is characterised in that：Calmed the anger liquid/gas separator (14) in being provided with medium pressure circulation, medium pressure gas-liquid separator (14) is by middle compression refrigerant Gas is sent into Medium pressure cycle blender (7) with being fed again into middle compacting after the gas mixing after low voltage refrigeration compressor (9) compression Cold compressor (8)；It is provided with high-pressure gas-liquid separator (2) in the cycle of higher pressure, the high-pressure gas-liquid separator (2) is by high-pressure refrigerant gas Body is sent into cycle of higher pressure blender (4) with being fed again into high-pressure refrigeration after the gas mixing after middle compacting cold compressor (8) compression Compressor (6).
- A kind of 7. liquefied ethane boil-off gas reliquefaction installation peculiar to vessel according to claim 1, it is characterised in that：The heat exchange Set gradually after device (13) and BOG choke valves (11) and BOG gas-liquid separators (12) are installed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720680222.1U CN206919522U (en) | 2017-06-13 | 2017-06-13 | A kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel |
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| CN201720680222.1U CN206919522U (en) | 2017-06-13 | 2017-06-13 | A kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101456A (en) * | 2017-06-13 | 2017-08-29 | 江苏华滋海洋工程有限公司 | A kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel |
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- 2017-06-13 CN CN201720680222.1U patent/CN206919522U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101456A (en) * | 2017-06-13 | 2017-08-29 | 江苏华滋海洋工程有限公司 | A kind of liquefied ethane boil-off gas reliquefaction installation peculiar to vessel |
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Address after: 226200 Group 24 of Jianglou Village, Qidong City and Hezhen City, Nantong City, Jiangsu Province Patentee after: Jiangsu Huazi Energy Engineering Co., Ltd. Address before: 226200 Group 24 of Jianglou Village, Qidong City and Hezhen City, Nantong City, Jiangsu Province Patentee before: WU HONGPING |