CN107859870A - A kind of method of liquefied natural gas BOG liquefaction recycling - Google Patents
A kind of method of liquefied natural gas BOG liquefaction recycling Download PDFInfo
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- CN107859870A CN107859870A CN201710829746.7A CN201710829746A CN107859870A CN 107859870 A CN107859870 A CN 107859870A CN 201710829746 A CN201710829746 A CN 201710829746A CN 107859870 A CN107859870 A CN 107859870A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a kind of method of liquefied natural gas BOG liquefaction recyclings, by the pressure value for monitoring LNG storage tank in real time, when caused BOG pressure values exceed tank system setting value in LNG storage tank, using injection technological process, the cryogen in caused gaseous state BOG and cryogen storage tank in LNG storage tank is collectively incorporated into main injection blender and once cooled down；Coolant and LNG feed liquors then are collectively incorporated into time jet mixer progress secondary cooling completion BOG to liquefy completely；Finally, the fluid after liquefaction backflows to LNG storage tank again, realizes BOG liquefaction and recycling completely.By controlling cryogen storage tank and LNG storage tank output flow, temperature and pressure and other parameters so that the BOG characteristics after liquefaction meet GB/T 19,204 2003《The general characteristic of liquefied natural gas》It is required that and compressor and pump need not be equipped with, its cost of investment is low, process system is simple, Operation and Maintenance expense is low.
Description
Technical field
The present invention relates to the liquefaction treatment technologies of the BOG in liquefied natural gas, more particularly to a kind of liquefied natural gas BOG liquefaction
The method of recycling.
Background technology
Liquefied natural gas (Liquefied Natural Gas, LNG) is a kind of high-quality clean energy resource, and its volume is about gas
The 1/625 of state natural gas volume, main component is methane, and combustion heat value is big, and environmental pollution is small after burning, in recent years demand
Present a rapidly rising trend, be widely used in the industrial circles such as gas, generating, fuel automobile, ship.At present, China is built
Into receiving terminals such as a large amount of LNG receiving stations, natural gas liquefaction station and LNG gas stations, be advantageous to China's energy stabilizing supply and energy
Source diversification.
LNG storage tank is the nucleus equipment of LNG receiving terminals, belongs to low temperature, atmospheric storage tank.In accumulating and operating process,
Due to LNG, boiling point (- 162 DEG C) is extremely low at ambient pressure, even if using storage tank novel high-performance heat-insulating material, external heat is always
Invading in storage tank, LNG, which unavoidably evaporates, produces a large amount of boil-off gas (Boil-OffGas, BOG), causes pressure of storage tank to raise, this
BOG day yields in part account for LNG 0.1%~0.3% (quality ratio).When pressure of storage tank is more than safety valve set pressure
When, atmospheric valve need to be opened and diffuse BOG, from the point of view of reusing of energy source angle, BOG, which is directly diffused, causes mass energy to dissipate.With
Day aerating ability is 1.5 × 104Nm3Exemplified by/d LNG gas stations, BOG yields are about 300kg/d, by domestic gas station LNG
Average sale price calculates, the moon economic loss be 2.8 × 104Member, end 2017, totally 2460 LNG gas stations, year are economical in China
Loss up to 8.3 × 108Member.For production safety and environmental angle, a large amount of BOG, which are diffused, may cause fire or blast, and
Greenhouse effects caused by BOG are 21 times of carbon dioxide.
In order to reduce energy waste and environmental pollution, it is necessary to this high-grade energies of BOG are recycled and reclaimed.At present, often
The BOG recovery technologies seen mainly have：
(1) flare system or directly emptying are sent after re-heat：Although this method is simple, security is poor, without economic effect
Benefit.
(2) storage tank thermal insulation layer is filled with BOG：Although make use of BOG sensible heat, the heat-insulating efficiency of thermal insulation layer is improved,
Poor operability；To BOG caused by Large LNG storage tank, part BOG can only be utilized, reuse ratio is relatively low.
(3) direct compression process：Directly compression is forced into pressure needed for outer defeated pipe network after the buffered tanks of BOG, measures plus smelly
After export to domestic gas pipe network.On the one hand, this method nucleus equipment is cryogenic compressor, and at present, the country does not have manufacture to locate
Manage the compressor that medium temperature is -162 DEG C；On the other hand, the LNG receiving terminals for nearby having gas ductwork are only limitted to, it is operable
Property is poor, and application is restricted.
(4) the re-liquefied technique of BOG tandem types：This method uses 9 heat exchangers of the refrigerant for propane, ethene and methane,
Three independent re-liquefied units are formed, reduce BOG temperature step by step until all re-liquefied.This method cost of investment is high, technique
Flow is complicated, need to be equipped with large-scale compressor, consumption substantial amounts of refrigerant during operation, safeguard more difficult.
The problem of domestic associated companies and research department exist for the above method, there are a variety of liquefied natural gas BOG
Recovery method.Such as the patent of invention of CNOOC Gas ＆ Power Group Co., Ltd.《A kind of LNG receiving terminals BOG recyclings
Method and system CN104964161A》, China Huanqiu Engineering Co. patent of invention《A kind of boil-off gas zero emission system and method
CN102261560A》Deng BOG caused by storage tank to be entered to after-condenser directly after cryogenic compressor is pressurized, the recovery method is still
Imported large-scale cryogenic compressor need to be equipped with and condensing plant, cost of investment are larger again.Guangzhou Hua Feng Energy Science Co., Ltd
Patent of invention《A kind of recovery BOG technique and its device CN103343881A》Although import cryogenic compressor is not used,
The device needs 1 pump, 2 normal temperature compressed machines, 2 expanding machines and 4 heat exchangers to reach the re-liquefied purposes of BOG, equipment cost
Height, technological process are complicated, need higher power consumption during operation.The patent of invention of China National Offshore Oil Corporation《A kind of LNG receiving stations
Utilize the BOG processing systems CN103225704A of pressure energy》Although complete high pressure LNG and BOG using solution-air mixer-ejector
Be sufficiently mixed, but the re-liquefied part BOG of cold that this method provides merely with LNG, fail all re-liquefied storage tanks and produce
BOG, and be only applicable to LNG receiving terminals, use range has certain limitation.
At the same time, found by the domestic and international different regions LNG components of comparative analysis and key property, different regions
LNG components are different, sometimes widely different.Due to the difference of component, the natural gas higher calorific value of same volume also differs,
Such as the minimum 36.1MJ/m of US natural gas higher calorific value3, it is up to 45MJ/m3, the two difference 24.6%；China's natural gas
The minimum 33.9MJ/m of higher calorific value3, it is up to 45MJ/m3, the difference between the two is up to 31%.If outer defeated LNG higher calorific values
Higher than the requirement of domestic higher calorific value standard, higher calorific value need to be adjusted, to avoid energy waste, increase entreprise cost.It is right
LNG higher calorific value adjusting processes, China not yet carry out special item.
In view of the BOG recovery methods that the above is traditional, it is necessary to seek a kind of low cost of investment, convenient operating maintenance, energy consumption
It is low, it can be widely applied to reclaim the BOG and adjustment LNG higher calorific value methods of LNG receiving terminals.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of liquefied natural gas BOG liquefaction
The method of recycling, its cost of investment is low, convenient operating maintenance, energy consumption are low, can be widely used in the liquefaction day of LNG receiving terminals
Right gas BOG reliquefaction disposals.
In order to achieve the above object, this invention takes following technical scheme：
A kind of method of liquefied natural gas BOG liquefaction recycling, comprises the following steps：
The pressure value of monitoring LNG storage tank in real time, when caused BOG pressure values exceed setting value in LNG storage tank, using drawing
Technological process is penetrated, the cryogen in caused gaseous state BOG and cryogen storage tank in LNG storage tank is collectively incorporated into main injection mixes
In clutch；
Cryogen is mixed in a manner of spraying with BOG by main injection blender, BOG is carried out a cooling liquid；
Fluid after liquefaction flows back to LNG storage tank, realizes BOG liquefaction recyclings.
The method of described liquefied natural gas BOG liquefaction recyclings, it is described that cryogen is made to spray by main injection blender
The mode penetrated mixes with BOG, make BOG carry out a cooling liquid the step of after, the fluid after liquefaction flow back to LNG storage
Tank, realize BOG liquefy recycling the step of before, in addition to：
Cooling liquid is flowed into time jet mixer, and is mixed with the LNG from LNG inputs and carried out secondary liquefaction.
The method of described liquefied natural gas BOG liquefaction recyclings, the coolant are flowed into time jet mixer, and with
The step of LNG mixing from LNG inputs carries out secondary liquefaction includes：
The LNG of LNG inputs output is filtered in inflow time jet mixer；
The secondary jet mixer sprays LNG, and is mixed with the cooling liquid of main injection blender output, carries out secondary
Cooling liquid.
The method of described liquefied natural gas BOG liquefaction recyclings, the pressure value of the LNG storage tank of monitoring in real time, works as LNG
When caused BOG pressure values exceed setting value in storage tank, using injection technological process, by caused gaseous state BOG in LNG storage tank and
The step that cryogen in cryogen storage tank is collectively incorporated into main injection blender also includes：
When the BOG pressure values of LNG storage tank are less than setting value, the LNG of LNG inputs output is filtered inflow
In LNG storage tank.
The method of described liquefied natural gas BOG liquefaction recyclings, the boiling point of the cryogen is less than -162 DEG C.
Compared to prior art, the method for liquefied natural gas BOG liquefaction recycling provided by the invention, by monitoring in real time
The pressure value of LNG storage tank, when caused BOG pressure values exceed tank system setting value in LNG storage tank, using injection technique stream
Journey, the cryogen in caused gaseous state BOG and cryogen storage tank in LNG storage tank is collectively incorporated into main injection blender,
Cryogen is mixed in a manner of spraying with BOG, once cooled down, the fluid after liquefaction flows back to LNG storage tank, realizes
BOG liquefaction recyclings.The cold that the present invention is provided using cryogen is liquefied storage tank BOG, realizes LNG storage tank
BOG liquefaction recyclings, by controlling cryogen storage tank and LNG storage tank output flow, temperature and pressure and other parameters so that liquefaction
BOG characteristics afterwards meet GB/T19204-2003《The general characteristic of liquefied natural gas》It is required that.And the nothing during re-liquefied
Moving component, it is easy to the serialization of production process, and compressor and pump need not be equipped with, its cost of investment is low, process system is simple
List, Operation and Maintenance expense are low, are suitably applied the receiving terminals such as LNG receiving stations, natural gas liquefaction station and LNG gas stations.
Brief description of the drawings
Fig. 1 provides the flow chart for the method that liquefied natural gas BOG liquefies recycling for the present invention.
Embodiment
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of liquefied natural gas BOG liquefaction
The method of recycling, the cold provided using cryogen are once liquefied BOG, and mixed liquor absorbs after once liquefying
Re-liquefied LNG colds are to be all liquid phase state, the LNG without gas phase.The sensible heat that one aspect of the present invention is provided using cryogen will
BOG is once cooled down caused by storage tank, is on the other hand carried out secondary cooling to BOG using LNG latent heat again, is finally realized LNG
The BOG of storage tank liquefaction and recycling completely.The equipment such as cryogenic compressor, pump and after-condenser need not be equipped with, merely with storage tank BOG
What the low pressure intake function that itself pressure and main injection blender and time jet mixer have flowed as fluid in pipeline
Power, the re-liquefied flows of BOG are optimized, power consumption has been saved, has reduced operation expense.By control cryogen storage tank and
LNG storage tank output flow, temperature and pressure and other parameters so that the BOG characteristics after liquefaction meet GB/T19204-2003《Liquefy day
The general characteristic of right gas》It is required that.And the advantages that system architecture simple and compact, energy consumption are low, investment is small, operating flexibility is big, can be wide
It is general to be applied to the receiving terminals such as LNG receiving stations, natural gas liquefaction station and LNG gas stations.
To make the purpose of the present invention, technical scheme and effect clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention
Limit the present invention.
Referring to Fig. 1, the method for liquefied natural gas BOG liquefaction recycling provided by the invention, comprises the following steps：
The pressure value of S100, in real time monitoring LNG storage tank, when caused BOG pressure values exceed setting value in LNG storage tank,
Using injection technological process, the cryogen in caused gaseous state BOG and cryogen storage tank in LNG storage tank is collectively incorporated into
In main injection blender；
S200, by main injection blender cryogen is mixed in a manner of spraying with BOG, BOG is once cooled down
Liquefaction；
S300, the fluid after liquefaction flow back to LNG storage tank, realize BOG liquefaction recyclings.
The low pressure intake function that the present invention has merely with storage tank BOG itself pressure and main injection blender is as fluid
In the power of pipeline flowing, the cold for using cryogen to provide fully contacts to enter storage tank BOG with spray regime with storage tank BOG
Row liquefaction, realize the BOG liquefaction recyclings of LNG storage tank.And the movement-less part during re-liquefied, it is easy to produce
The serialization of journey, and compressor and pump need not be equipped with, its cost of investment is low, process system is simple, Operation and Maintenance expense is low, fits
Close and be applied to the receiving terminals such as LNG receiving stations, natural gas liquefaction station and LNG gas stations.
In order to ensure BOG " zero-emission ", after step S200, after S300, in the liquefied natural gas BOG liquid of the present invention
Changing the method for recycling also includes S210：Cooling liquid is flowed into time jet mixer, and is mixed with the LNG from LNG inputs
Close and carry out secondary liquefaction, by the cold of LNG inputs, the liquid of re-liquefied main injection blender output, make the BOG of residual
It is re-liquefied, so as to obtain the LNG for meeting relevant criterion, realize BOG " zero-emission ".
When it is implemented, the step S210 is specifically included：
The LNG of S211, LNG input output is filtered in inflow time jet mixer；
S212, the secondary jet mixer spray LNG, and are mixed with the cooling liquid of main injection blender output, enter
Row secondary cooling liquefies.
One aspect of the present invention is once cooled down BOG caused by storage tank using the sensible heat that cryogen provides, the opposing party
Face carries out secondary cooling using LNG latent heat to BOG again, finally realizes BOG liquefaction and the recycling completely of LNG storage tank, completely real
BOG " zero-emission " is showed, while LNG higher calorific values have adjusted according to outer defeated demand；By controlling cryogen storage tank and LNG
The parameters such as storage tank output flow, temperature and pressure so that BOG is re-liquefied to meet GB/T19204-2003 for its characteristic after LNG《Liquid
Change the general characteristic of natural gas》It is required that.
To make the method for liquefied natural gas BOG liquefaction recyclings connect operation, the step S100 also includes：When LNG is stored up
When the BOG pressure values of tank are less than setting value, the LNG of LNG inputs output, which is filtered, to be flowed into LNG storage tank.LNG is defeated
Enter the LNG at end essentially from cold box system, when the pressure value of LNG storage tank is less than setting value, continue to store up to LNG from cold box system
Tank conveys LNG.
In specific implementation process, lead between LNG storage tank, cryogen storage tank, main injection blender, secondary jet mixer
Piping (LNG feed tubes, cryogen drain pipe and BOG efferent ducts) is connected, and valve is provided with each pipeline to control LNG
The flow direction of liquid gas and BOG in storage tank, cryogen storage tank.The boiling point of the cryogen is less than -162 DEG C, low temperature stream
, can be so that it becomes liquid as long as body can reduce BOG temperature.
To LNG Physical Properties of Low Temperature and makings Optimum Experiment device and actual device, LNG storage tank, cryogen storage tank, main injection
Internal flow between blender, secondary jet mixer and each pipeline is that the dynamic internal flow of pressure flow of incompressible fluid is
The pressure flow of incompressible fluid moves, and viscous force and pressure are predominant intermolecular forces, and gravity can be ignored, thus is studying it
During flowing, as long as (it includes quasi- number Ne, Fei Laode number of reynolds number Re, newton to the main similarity criterion of guarantee influence process progress
Fr, Euler's numbers Eu, Si Tehaer number Sr, Womersley number Wo, Mach number Ma, Weber number We) it is equal.Because LNG is in pipe
Flow to be forced to steady flow, the influence of Fei Laode numbers (Fr) criterion and equal when property (Ho) criterion can not be considered；Fluid is several
What similar Flow In A Circular Tube, there is Eu=f (Re).Only need to ensure Reynolds number (Re) criterion in above-mentioned similarity criterion.
In view of the operation characteristic in dielectric property and pipeline, guarantee test device and actual device pipeline are only needed in concrete analysis
Interior media flow state is in the same area, and does not need its Reynolds number of strict guarantee identical, specifically may include shear stress
It is equal equal with Reynolds number.
Before equal both forms equal with Reynolds number of shear stress are introduced, the present invention is first carried out to the experiment principle of similitude
Analysis：
Two physical phenomenons of all generations in geometric similarity space, if each physical quantity of the same nameIn any phase
Corresponding space and corresponding moment all respectively keep certain ratioReferred to as physical quantitySimilar factor, i.e.,
In formula,The numeral " ＇ " in the upper right corner and " " " is respectively that the physical quantity belongs to actual device and experimental rig.Here
Corresponding space refers to that geometric similarity is similar with the time with corresponding moment respectively, and the expression formula of the two is consistent, simply has
Respective similar factor ClAnd Ct。
Every similar phenomenon each other must is fulfilled for the single-valued conditions of actual device and the physical phenomenon conducted in model
It is similar, of the same name fixed it is then equal.To LNG Physical Properties of Low Temperature and makings optimization preferred scheme, jet mixer, LNG pipelines, low temperature
Fluid line and the flowing of BOG pipeline mediums are single-phase flow, and its LNG fluidised form can be regarded as viscous incompressible fluid.Root
Continuity equation can be exported according to mass conservation law
By formula (1-002), with reference to Newton's second law, the equation of motion can be exported
I.e.
In formula, F is mass force；P is pressure；ρ is the density of fluid；μ is the dynamic viscosity of fluid；U is the speed of fluid.
From the theory of similarity, it is respectively for the equation of motion of the test fluid with real fluid in the X-axis direction
Two kinds of fluid phenomenons are similar, had by formula (1-001)
Formula (1-008) is substituted into formula (1-006) has
Comparison expression (1-009) obtains with formula (1-007)
After arrangement
Formula (1-008) is substituted into formula (1-007) to obtain
Equally, by two-dimensional flow energy equation
It can be obtained by similarity analysis
Due to
Thus
Make experimental rig and actual device are completely similar to must simultaneously meet geometric similarity, kinematic similitude and power phase
Seemingly, ensure that all similarity numbers for studying phenomenon are equal, i.e., all similar factors must be made to be equal to 1.
I.e.：Cl=Cu=Ct=Ca=Cu=1 (1-020)
This be for general phenomenon it is extremely difficult, it is even impossible；In Practical Project, as long as guarantee section
Similarity criterion is equal, and part fundamental quantity similar (i.e. shear stress is equal equal with Reynolds number) can meet to require.
Both forms equal with Reynolds number equal to shear stress are described in detail below：
1st, shear stress is equal
Effective shear stress of pipeline liquid is the parameter of macroscopic token friction loss characteristic, laminar flow and the smooth region of turbulent flow Guan Liuyou
Effect shear rate is numerically equal to tube wall shear speed.No matter the fluidised form of medium in pipe, the flowing at tube wall is laminar flow
Flowing.Then the shearing stress at tube wall should be directly proportional to shear rate.Under the conditions of steady flow, Newtonian fluid is in the smooth region of turbulent flow
The calculation formula of the effective shear rate of pipe stream be
Wherein, l is characterized length, is pipe diameter d, m for its characteristic length of the fluid of Bottomhole pressure l；U is stream in pipe
Rate of flow of fluid, m/s；Re is the Reynolds number of tube fluid；ρ is tube fluid density, kg/m3；μ is the dynamic viscosity of tube fluid,
Pa·s。
To make test model accurately reflect actual fed situation, tested from identical with actual pipeline by pipeline.
Obtained by above formula
Comprehensive improvement can obtain
In formula, u ', u " are respectively actual pipeline and test pipeline velocity of medium, m/s；D ', d " be respectively actual pipeline and
Test tubing internal diameter, m.
Tube fluid flow is
In formula, Q is tube fluid flow, kg/s.
2nd, Reynolds number is equal
The Reynolds number of actual device and experimental rig is Re ', Re " respectively, and the relation of the two is shown in formula (1-015), convolution
(1-12) and formula (1-015) deformation can be obtained
To make test model accurately reflect actual fed situation, tested from actual pipeline identical test(ing) medium
That is μ '=μ ", ρ "=ρ ', and take pipe diameter d for its characteristic length of the fluid of Bottomhole pressure l.Obtained by above formula
Obtained by formula (1-15), the relation of the rate-of flow of actual device and experimental rig is
Formula (1-17) is substituted into formula (1-18) to obtain
Further to make the re-liquefied process stabilizations of liquefied natural gas BOG reliably carry out, liquefied natural gas BOG of the invention
In the method for the recycling that liquefies, a stop valve is respectively set on two LNG feed tubes, check-valves is provided with BOG efferent ducts,
Low temperature explosion-proof electromagnetic flow control valve is provided with cryogen drain pipe.And LNG storage tank liquid is provided with LNG storage tank
Position monitoring device, sets LNG emergency shutoff devices on LNG feed tubes, sets cryogen tight on cryogen drain pipe
Anxious shearing device.The automatic alarm when tank level transfinites, and start immediately tight on LNG feed tubes and cryogen drain pipe
Anxious shearing device, avoid the security incident caused by liquid level transfinites.
Further, low temperature explosion-proof electromagnetic flow control valve can mix in BOG amounts and secondary injection according to caused by LNG storage tank
Clutch output LNG nitrogen contents and higher calorific value adjust the cryogen flow needed for re-liquefied BOG.
Further, the present invention can also set multicomponent on-line analysis system on the export pipeline of secondary jet mixer
System, pressure monitoring device and device for detecting temperature, to monitor LNG component, pressure and temperature respectively, ensureing that BOG is re-liquefied is
Its characteristic meets GB/T 19204-2003 after LNG《The general characteristic of liquefied natural gas》It is required that.
Above-mentioned level monitoring device, emergency shutoff device, multicomponent on-line analysis system, pressure monitoring device and temperature prison
Survey device to be connected with DCS control systems, without manual operation, ensure system safe and stable operation.
Further, the present invention can also be provided with stream on LNG feed tubes, cryogen drain pipe and BOG efferent ducts
Amount monitoring and adjusting means, to adjust LNG stream amount and cryogen flow according to the BOG yields of LNG storage tank, fully achieve certainly
Dynamic regulatory function, save artificial.
Compared with prior art the invention has the advantages that：
1st, the present invention need not be equipped with the equipment such as cryogenic compressor, pump and after-condenser, merely with LNG storage tank BOG's itself
The power that the low pressure intake function that pressure and main injection blender and time jet mixer have flows as fluid in pipeline, it is excellent
The re-liquefied flows of BOG are changed, have saved power consumption, reduced operation expense.
2nd, the present invention has the advantages that simple and compact for structure, energy consumption is low, investment is small, operating flexibility is big, can be widely applied to
The receiving terminals such as LNG receiving stations, natural gas liquefaction station and LNG gas stations.Using the new and effective re-liquefied equipment of BOG, simply
It is easy, it is re-liquefied during movement-less part, be easy to the serialization of production process.Fully achieve BOG " zero-emission ", while root
LNG higher calorific values are have adjusted according to outer defeated demand；BOG is re-liquefied to meet GB/T19204-2003 for its characteristic after LNG《Liquefaction is natural
The general characteristic of gas》It is required that.
3rd, the present invention is realized to LNG storage tank by setting LNG emergency shutoff devices and cryogen emergency shutoff device
Liquid level, avoid leading to security incident because liquid level transfinites.
4th, the present invention sets low temperature explosion-proof electromagnetic flow control valve in cryogen storage tank leakage fluid dram pipeline, by controlling it
Cryogen flow needed for the re-liquefied BOG of aperture regulation and adjustment LNG higher calorific values, fully achieve the stabilization of the system
Operation.
5th, the present invention secondary jet mixer export pipeline be provided with multicomponent on-line analysis system, pressure monitoring device and
Device for detecting temperature, to monitor re-liquefied rear LNG constituent content, pressure and temperature, ensure that LNG characteristics meet GB/T19204-
2003《The general characteristic of liquefied natural gas》It is required that.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (5)
- A kind of 1. method of liquefied natural gas BOG liquefaction recycling, it is characterised in that comprise the following steps：The pressure value of monitoring LNG storage tank in real time, when caused BOG pressure values exceed setting value in LNG storage tank, using injection work Skill flow, the cryogen in caused gaseous state BOG and cryogen storage tank in LNG storage tank is collectively incorporated into main injection blender In；Cryogen is mixed in a manner of spraying with BOG by main injection blender, BOG is carried out a cooling liquid；Fluid after liquefaction flows back to LNG storage tank, realizes BOG liquefaction recyclings.
- 2. the method for liquefied natural gas BOG liquefaction recycling according to claim 1, it is characterised in that described by main jet Penetrating blender makes cryogen be mixed in a manner of spraying with BOG, make BOG carry out a cooling liquid the step of after, it is described Fluid after liquefaction flows back to LNG storage tank, realize BOG liquefy recycling the step of before, in addition to：Cooling liquid is flowed into time jet mixer, and is mixed with the LNG from LNG inputs and carried out secondary liquefaction.
- 3. the method for liquefied natural gas BOG liquefaction recycling according to claim 1, it is characterised in that the coolant Flow into time jet mixer, and mix the step of carrying out secondary liquefaction with the LNG from LNG inputs to include：The LNG of LNG inputs output is filtered in inflow time jet mixer；The secondary jet mixer sprays LNG, and is mixed with the cooling liquid of main injection blender output, carries out secondary cooling Liquefaction.
- 4. the method for liquefied natural gas BOG liquefaction recycling according to claim 1, it is characterised in that the prison in real time The pressure value of LNG storage tank is surveyed,, will using injection technological process when caused BOG pressure values exceed setting value in LNG storage tank Cryogen in LNG storage tank in caused gaseous state BOG and cryogen storage tank is collectively incorporated into the step in main injection blender Also include：When the BOG pressure values of LNG storage tank are less than setting value, the LNG of LNG inputs output, which is filtered, flows into LNG storages In tank.
- 5. the method for liquefied natural gas BOG liquefaction recycling according to claim 1, it is characterised in that the low temperature stream The boiling point of body is less than -162 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710829746.7A CN107859870A (en) | 2017-09-15 | 2017-09-15 | A kind of method of liquefied natural gas BOG liquefaction recycling |
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| CN201710829746.7A CN107859870A (en) | 2017-09-15 | 2017-09-15 | A kind of method of liquefied natural gas BOG liquefaction recycling |
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Cited By (4)
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| CN107883181A (en) * | 2017-09-29 | 2018-04-06 | 深圳市燃气集团股份有限公司 | A kind of BOG liquefaction recycling methods of hybrid liquefied natural gas |
| CN111561657A (en) * | 2020-05-21 | 2020-08-21 | 大连海洋大学 | Boil-off gas treatment device for liquefied natural gas device |
| CN111637359A (en) * | 2020-06-01 | 2020-09-08 | 中海石油气电集团有限责任公司 | Novel BOG re-condensation system and method for LNG receiving station |
| CN111811210A (en) * | 2019-04-10 | 2020-10-23 | 中国石油化工股份有限公司 | Injection condenser, device and method for treating boil-off gas of liquefied natural gas |
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| CN107883181A (en) * | 2017-09-29 | 2018-04-06 | 深圳市燃气集团股份有限公司 | A kind of BOG liquefaction recycling methods of hybrid liquefied natural gas |
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| CN111811210B (en) * | 2019-04-10 | 2022-05-24 | 中国石油化工股份有限公司 | Injection condenser, device and method for treating boil-off gas of liquefied natural gas |
| CN111561657A (en) * | 2020-05-21 | 2020-08-21 | 大连海洋大学 | Boil-off gas treatment device for liquefied natural gas device |
| CN111637359A (en) * | 2020-06-01 | 2020-09-08 | 中海石油气电集团有限责任公司 | Novel BOG re-condensation system and method for LNG receiving station |
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