CN110529742A - A kind of automobile mounted insulated gas cylinder boil-off gas recycling system of LNG - Google Patents
A kind of automobile mounted insulated gas cylinder boil-off gas recycling system of LNG Download PDFInfo
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- CN110529742A CN110529742A CN201910916189.1A CN201910916189A CN110529742A CN 110529742 A CN110529742 A CN 110529742A CN 201910916189 A CN201910916189 A CN 201910916189A CN 110529742 A CN110529742 A CN 110529742A
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- collecting tank
- gas
- boil
- lng
- inner cavity
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- 238000004064 recycling Methods 0.000 title claims abstract description 29
- 230000006835 compression Effects 0.000 claims abstract description 12
- 238000007906 compression Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 238000007667 floating Methods 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 16
- 230000003020 moisturizing effect Effects 0.000 claims description 16
- 239000010865 sewage Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 134
- 239000003949 liquefied natural gas Substances 0.000 abstract description 77
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 12
- 239000000446 fuel Substances 0.000 abstract description 5
- 239000005431 greenhouse gas Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000021186 dishes Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001535 kindling effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 210000000952 spleen Anatomy 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000036642 wellbeing Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention discloses a kind of automobile mounted insulated gas cylinder boil-off gas recycling system of LNG, belongs to liquefied natural gas field, including boil-off gas collection module, boil-off gas compression module, boil-off gas storage module；The system can recycle BOG under conditions of not influencing the automobile mounted insulated gas cylinder of LNG normally release BOG safely, and the system structure is simple, and it is convenient to operate, and takes up space small, can be parked in garage or parking lot；High pressure BOG storage tank is detachable, the BOG of collection can be returned to gas station, can also be placed on vehicle, as the supply of motor vehicle fuel, the service efficiency of LNG in LNG automobile can be improved, and reduces with greenhouse gas methane BOG discharge as main component.
Description
Technical field
The present invention relates to liquefied natural gas BOG gas recycling field, specifically a kind of automobile mounted insulated gas cylinder boil-off gas of LNG
Recycling system.
Background technique
Transition and the fast development of market for natural gas are cleaned with the energy, liquefied natural gas is (hereinafter referred to as
" LNG ") it is widely used, it is continuously increased in the quantity of field of traffic LNG automobile.Because of the low-temperature characteristics of LNG, in its storage process
In need cold insulation.Currently used for the container of storage LNG, such as the Large LNG storage tank of LNG receiving station terminal, and it is used for
The LNG storage tank of LNG gas station, as long as tank inside and outside are there are the temperature difference, outside heat will import tank inside, cause
LNG gasification generates boil-off gas (referred to as " BOG "), and the main component of boil-off gas is methane.The LNG of LNG receiving station and LNG gas station
Has the application of wide BOG recovery system on storage tank, but on LNG automobile, the application of BOG recycling is seldom.
LNG welded insulated gas cylinder is equally to generate in use on LNG automobile for storing the container of LNG
BOG, when BOG is constantly generated and is more than that gas cylinder allows pressure, gas cylinder needs to discharge a part of BOG to be depressured, due to separate unit LNG
The insulated gas cylinder evaporation of automobile is narrow-minded, and currently used is to be discharged directly to the atmosphere, one side LNG automobile substantial amounts, institute
The boil-off gas total amount for having LNG automobile to generate be can not ignore, and it is remote that the greenhouse effects of another aspect natural gas in an atmosphere heat potentiality
Higher than carbon dioxide.Therefore, it is necessary to be carried out in the case where not influencing LNG cryogenic insulated cylinder and normally using safely to BOG
It is effective to collect, store and utilize.
Application No. is the patents of invention of 201810575596.6 entitled " LNG storage tank BOG recovery systems ", by BOG LNG
Gasifier carries out level-one cooling, it is not necessary that from when being pressurized, LNG gasification device can not generate cold in without using LNG in storage tank or storage tank
Can, level-one cooling can not carry out, and then influence second level cooling and liquefaction, and eventually leading to the BOG under this operating condition can not recycle.
Application No. is the invention of 201410558532.7 entitled " LNG receiving station terminal boil-off gas recovery systems " is special
Benefit, when the system is defeated outside LNG receiving station gas, by BOG compress and with LNG carry out heat exchange be allowed to cool down, make high pressure BOG condense
It is returned in storage tank for LNG, which needs to carry out under conditions of LNG is just defeated outside in storage tank to the recycling of BOG, and LNG vapour
The vehicle-mounted insulated gas cylinder BOG release of vehicle and LNG are used and are not carried out simultaneously.
Application No. is the patents of invention of a kind of 201410633000.5 entitled " methods of BOG recycling ", are made using liquid nitrogen
For the refrigerant of BOG, but the acquisition of liquid nitrogen and adds and set liquid nitrogen storage tank and make this method in LNG automobile insulated gas cylinder BOG recycling
It is difficult to promote.
Summary of the invention
For above-mentioned background and the shortcomings of the prior art, the present invention proposes that a kind of automobile mounted insulated gas cylinder of LNG steams
It gets angry recycling system, suitable for the boil-off gas BOG recycling under the automobile mounted insulated gas cylinder safety valve release operating condition of LNG；Phase
For LNG receiving station and LNG gas station, boil-off gas BOG flow is small under this operating condition and fluctuation is big, the time of boil-off gas BOG release
Discontinuous and irregular, the period of boil-off gas BOG release and the period that LNG is used be not often be overlapped；Present system structure letter
Clean, it is convenient to operate, and takes up space small, can be parked in garage or parking lot；High pressure BOG storage tank is detachable, can return the BOG of collection
Gas station is gone back to, can also be placed on vehicle, as the supply of motor vehicle fuel, the service efficiency of LNG in LNG automobile can be improved, is reduced
With greenhouse gas methane BOG discharge as main component.
A kind of automobile mounted insulated gas cylinder boil-off gas recycling system of LNG, including four functional modules: boil-off gas is collected
Module 1, boil-off gas compression module 2, boil-off gas storage module 3；
Boil-off gas collection module 1 includes flexible pipe 5, three-way magnetic valve 6, discharge outlet I7, check valve I8, boil-off gas collecting tank
9, check valve II10, collecting tank inlet flange 11, conduit 14, double floating ball lever meters 15, liquid-level switch 16, moisturizing drain 17,
Sewage draining exit 18, collecting tank outlet(discharge) flange 19；Boil-off gas collecting tank 9 uses double layer jacket structure, including collecting tank exocoel 12, collection
Tank inner cavity 13,13 bottom of collecting tank inner cavity are connected to collecting tank exocoel 12；
Boil-off gas compression module 2 includes compressor 20, universal motor 21, motor power；
Boil-off gas storage module 3 include flange 24, check valve III25, pressure transmitter 26, drain valve 28, pressure reducing valve 29,
By-passing valve 30, discharge outlet II31, high pressure BOG storage tank 32, pressure gauge 38；
40 discharge outlet of safety valve that the automobile mounted insulated gas cylinder 39 of LNG discharges boil-off gas passes through flexible pipe 5 and threeway electromagnetism
Valve 6 connects, and three-way magnetic valve 6 is also connect with discharge outlet I7, check valve I8 respectively, and check valve I8 and collecting tank inlet flange 11 connect
It connects, 11 other end connecting conduit 14 of collecting tank inlet flange, conduit 14 enters the collecting tank exocoel 12 of boil-off gas collecting tank 9, leads
14 other end of pipe is crotch structure, and the top of crotch structure enters collecting tank inner cavity 13, collecting tank exocoel 12, collecting tank inner cavity 13
It is provided with water, double floating ball lever meters 15 are set in collecting tank inner cavity 13, double floating ball lever meters 15 are connect with liquid-level switch 16, liquid level
Switch 16 is connect with control module 4, and 12 bottom of collecting tank exocoel is equipped with sewage draining exit 18, is put at the top of collecting tank exocoel 12 equipped with moisturizing
Eat dishes without rice or wine 17, moisturizing drain 17 is used for moisturizing and emptying, and collecting tank exocoel 12,13 top exit of collecting tank inner cavity are overlapped, outlet
Place, which is equipped with, is arranged ring flange 33, connection outlet pipeline on ring flange 33, and collecting tank outlet(discharge) flange 19 is arranged on outlet conduit, collects
Tank outlet(discharge) flange 19 is connect with check valve II10, and check valve II10 is connect with 20 one end of compressor, compressor 20 and alternating current-direct current two
It being connected with motor 21, universal motor 21 is also connect with motor power, 20 other end connecting flange 24 of compressor,
Flange 24 is connect with check valve III25, and check valve III25 is connect with high pressure BOG storage tank 32, is additionally provided on high pressure BOG storage tank 32
Pressure transmitter 26, drain valve 28 is additionally provided on high pressure BOG storage tank 32, and drain valve 28 connects with pressure reducing valve 29, by-passing valve 30 respectively
It connects, pressure reducing valve 29,30 other end of by-passing valve are discharge outlet II31, are equipped with pressure gauge 38 at discharge outlet II31.
The system also includes control module 4, control module 4 is regular market purchase controller, control module 4 respectively with threeway
Solenoid valve 6, liquidometer switch 16, universal motor 21, pressure transmitter 26 connect, pressure transmitter 26 and control mould
Socket connector 27 is additionally provided between block 4.
The ring flange 33 is fixed on 12 exit edge of collecting tank exocoel by bolt 34.
The liquidometer upper limit 36 of double floating ball lever meters 15 is in the position of 13 total height 85~95% of collecting tank inner cavity
It sets, liquidometer lower limit 37 is in the position of 13 total height 10~15% of collecting tank inner cavity.
13 side lower of collecting tank inner cavity is provided with guide hole, and conduit 14 enters collecting tank inner cavity 13 from guide hole.
The motor power is battery 22 or alternating current 23, and universal motor 21 can use battery 22
Power supply can be powered with alternating current 23.
13 bottom of collecting tank inner cavity is connected to as the complete hollow out in 13 bottom of collecting tank inner cavity, hollow out with collecting tank exocoel 12
Lower limit 37 is counted lower than position in the horizontal position at place；Or 13 bottom sides of collecting tank inner cavity are provided with several water holes 35, at water hole 35
Lower limit 37 is counted lower than position in horizontal position, and collecting tank inner cavity 13 is connected to by water hole 35 with collecting tank exocoel 12.
The total measurement (volume) of the boil-off gas collecting tank 9 is the total measurement (volume) of collecting tank exocoel 12, is the automobile mounted insulation of LNG
The 5~7% of 39 nominal volume of gas cylinder, the liquidometer upper limit 36 from double floating ball lever meters 15 are included to liquidometer lower limit 37
Collecting tank inner cavity 13 volume be boil-off gas collecting tank 9 dischargeable capacity, the dischargeable capacity of boil-off gas collecting tank 9 is not less than
3L。
32 nominal volume of high pressure BOG storage tank is the 20~30% of automobile mounted 39 nominal volume of insulated gas cylinder of LNG, volume
Constant-pressure is 9~12MPa.
The folding of the three-way magnetic valve 6 is completed by control module 4, and an access of three-way magnetic valve 6 passes through check valve
I8 leads to boil-off gas collecting tank 9, and another is then directly discharged in air by discharge outlet I7；6 power failure state of three-way magnetic valve
When towards boil-off gas collecting tank 9 path blockade, towards discharge outlet I7 access open, when system powers off suddenly, LNG automobile
The BOG that vehicle-mounted insulated gas cylinder 39 generates is directly discharged to atmosphere, ensures that pressure is in safe model in gas cylinder and recovery system with this
In enclosing.
The conduit 14 is in the liquidometer upper limit that the outlet of one end outside boil-off gas collecting tank 9 is higher than double floating ball lever meters 15
Position 36；One end export direction that conduit 14 is located in collecting tank inner cavity 13 is upward, and outlet port is not less than collecting tank inner cavity 13
Bottom is connected to the position of collecting tank exocoel 12, and BOG is imported into 13 bottom of collecting tank inner cavity, received in a manner of bubble by conduit 14
Collection prevents BOG leakage and air blending.
The moisturizing drain 17 is located at 12 highest point of collecting tank exocoel, and is connected to collecting tank exocoel 12, moisturizing emptying
Mouth 17 is used to for extra water or air being discharged, and guarantees that pressure inside the tank is stablized, and when water is inadequate in tank, is used to add water, described
Sewage draining exit 18 is located at 9 minimum point of boil-off gas collecting tank, the blowdown and cleaning for boil-off gas collecting tank 9.
The boil-off gas storage module 3 is used to storing and recycling the high pressure BOG compressed by boil-off gas compression module 2,
Flange 24 and socket connector 27 are detachable, can unload from whole system, after high pressure BOG storage tank 32 is filled, be put
Onto LNG automobile, the high pressure BOG of storage is depressurized by pressure reducing valve 29, be can be used as the fuel supply of automobile, can also be passed through bypass
The BOG of collection is returned to gas station by valve 30.
Beneficial effects of the present invention:
1, boil-off gas collecting tank of the present invention uses double layer jacket structure, including collecting tank exocoel, collecting tank inner cavity, collecting tank
Intracavity bottom is connected to collecting tank exocoel, if the water shortage in use process in boil-off gas collecting tank, passes through moisturizing drain
Add water, this structure effectively prevents BOG from leaking, and the module in boil-off gas collection module downstream and the automobile mounted insulation of LNG
Gas circuit between gas cylinder is opened with water segregation, and when the kindling of downstream device fails, flame is not transferred in LNG gas cylinder, peace
Quan Xinggao.
2, the BOG flow that the present invention is handled is small, and the time for generating BOG is discontinuous and irregular, and flowed fluctuation changes greatly, is
Distributed or mobile small-sized LNG storage tank provides BOG collection scheme, the BOG with existing LNG receiving station and LNG gas station
Recovery scheme forms complementation.
3, the present invention has comprehensively considered BOG compression energy consumption and space hold, and the energy consumption for compressing BOG is less than the heat of BOG
Value, while there is economic well-being of workers and staff and environmental benefit.
4, since the automobile mounted insulated gas cylinder of LNG is needed to environmental emission BOG, the stand of LNG automobile needs to keep
Preferable ventilated environment, therefore LNG automobile is generally medium-and-large-sized car or heavy-duty car, due to the garage space phase of family car
To closed, it will cause BOG concentration in garage to environmental emission BOG and reach explosion limit, cause security risk, the present invention occupies sky
Between it is small, garage or parking lot can be placed on, solve the problems, such as that BOG is diffused safely, may advantageously facilitate LNG in kart more
It is widely applied.
5, boil-off gas storage module of the present invention is detachable, and high pressure BOG storage tank can be placed on vehicle, and the fuel as automobile supplies
It gives, the gas of collection can also be returned to natural gas filling station, propose the scheme utilized after BOG recycling.
Detailed description of the invention
Fig. 1 is the automobile mounted insulated gas cylinder boil-off gas recycling system structural schematic diagram of embodiment 1LNG；
Fig. 2 is that the positive of 1 boil-off gas collecting tank of embodiment waits shaft side figures；
Fig. 3 is the sectional view of 1 boil-off gas collecting tank of embodiment；
Fig. 4 is the sectional view of 2 boil-off gas collecting tank of embodiment；
In figure: 1- boil-off gas collection module, 2- boil-off gas compression module, 3- boil-off gas storage module, 4- control module, 5-
Flexible pipe, 6- three-way magnetic valve, 7- discharge outlet I, 8- check valve I, 9- boil-off gas collecting tank, 10- check valve II, 11- collecting tank
Inlet flange, 12- collecting tank exocoel, 13- collecting tank inner cavity, 14- conduit, the bis- floating ball lever meters of 15-, 16- liquid-level switch, 17-
Moisturizing drain, 18- sewage draining exit, 19- collecting tank outlet(discharge) flange, 20- compressor, 21- universal motor, 22- electric power storage
Pond, 23- alternating current, 24- flange, 25- check valve III, 26- pressure transmitter, 27- socket connector, 28- drain valve, 29- subtract
Pressure valve, 30- by-passing valve, 31- discharge outlet II, 32- high pressure BOG storage tank, 33- ring flange, 34- bolt, the hole 35-, on 36- liquidometer
Limit, 37- liquidometer lower limit, 38- pressure gauge, the automobile mounted insulated gas cylinder of 39-LNG, 40- safety valve.
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1
A kind of automobile mounted insulated gas cylinder boil-off gas recycling system of LNG, as shown in Figure 1, 2, 3, including four functions
Module: boil-off gas collection module 1, boil-off gas compression module 2, boil-off gas storage module 3, control module 4；
Boil-off gas collection module 1 is used to collect the BOG of automobile mounted 39 safety valve 40 of the insulated gas cylinder release of LNG, is guaranteeing
In the case that gas cylinder normally diffuses BOG safely, it is collected；Boil-off gas collection module 1 includes flexible pipe 5, threeway electromagnetism
Valve 6, discharge outlet I7, check valve I8, boil-off gas collecting tank 9, check valve II10, collecting tank inlet flange 11, conduit 14, double floating balls
Liquidometer 15, liquid-level switch 16, moisturizing drain 17, sewage draining exit 18, collecting tank outlet(discharge) flange 19, ring flange 33, bolt 34；It steams
Collecting tank 9 of getting angry uses double layer jacket structure, including collecting tank exocoel 12, collecting tank inner cavity 13,13 bottom of collecting tank inner cavity with
Collecting tank exocoel 12 is connected to；
Boil-off gas compression module 2 includes compressor 20, universal motor 21, motor power, motor power
Including battery 22, alternating current 23；
Boil-off gas storage module 3 include flange 24, check valve III25, pressure transmitter 26, drain valve 28, pressure reducing valve 29,
By-passing valve 30, discharge outlet II31, high pressure BOG storage tank 32, pressure gauge 38；
Control module 4 uses 32 8-digit microcontroller of regular market purchase；With warning function；
40 discharge outlet of safety valve that the automobile mounted insulated gas cylinder 39 of LNG discharges boil-off gas passes through flexible pipe 5 and threeway electromagnetism
Valve 6 connects, and flexible pipe 5 is metal bellows, and three-way magnetic valve 6 also connects with discharge outlet I7, check valve I8, control module 4 respectively
It connects, check valve I8 is connect with collecting tank inlet flange 11,11 other end connecting conduit 14 of collecting tank inlet flange, and conduit 14 enters
The collecting tank exocoel 12 of boil-off gas collecting tank 9,14 other end of conduit are crotch structure, and 13 side lower of collecting tank inner cavity, which is provided with, leads
Pore, the top of 14 crotch structure of conduit enter collecting tank inner cavity 13 from guide hole, in collecting tank exocoel 12, collecting tank inner cavity 13
Equipped with water, double floating ball lever meters 15 are set in collecting tank inner cavity 13, are located at liquidometer upper limit 36 in double floating ball lever meters 15
The peak of inner cavity water level when floating ball is used to limit work, the floating ball positioned at liquidometer lower limit 37 is for inner cavity when limiting work
The minimum of water level, liquidometer upper limit 36 are in the position of 13 total height 85% of collecting tank inner cavity, at liquidometer lower limit 37
In the position of 13 total height 10% of collecting tank inner cavity, 13 bottom of collecting tank inner cavity is connected to as collecting tank inner cavity with collecting tank exocoel 12
Lower limit 37 is counted lower than position in the complete hollow out in 13 bottoms, hollow part bottom level position；Double floating ball lever meters 15 and liquid-level switch 16
Connection, liquid-level switch 16 connect with control module 4, and control module 4 receives the signal that liquid-level switch 16 transmits, and store with
Feedback, 12 bottom of collecting tank exocoel are equipped with sewage draining exit 18, and sewage draining exit 18 is located at 9 minimum point of boil-off gas collecting tank, are used for boil-off gas
The blowdown and cleaning of collecting tank 9, moisturizing drain 17 is equipped at the top of collecting tank exocoel 12, and moisturizing drain 17 is located at outside collecting tank
12 highest point of chamber, and be connected to collecting tank exocoel 12, moisturizing drain 17 is used to for extra water or air being discharged, and guarantees to collect
Pressure inside the tank is stablized, when water is inadequate in tank, for adding water；Collecting tank exocoel 12,13 top exit of collecting tank inner cavity are overlapped,
Exit is equipped with setting ring flange 33, and ring flange 33 is fixed on 12 exit edge of collecting tank exocoel by bolt 34, ring flange
Collecting tank outlet(discharge) flange 19 is arranged on outlet conduit for connection outlet pipeline on 33；
Collecting tank outlet(discharge) flange 19 is connect with check valve II10, and check valve II10 is connect with 20 one end of compressor, compressor
20 connect with universal motor 21, universal motor 21 also respectively with battery 22, alternating current 23, control mould
Block 4 connects, and universal motor 21 can be powered with battery 22, can be powered with alternating current 23；
20 other end connecting flange 24 of compressor, flange 24 are connect with check valve III25, check valve III25 and high pressure BOG
Storage tank 32 connects, and 32 nominal volume of high pressure BOG storage tank is the 20% of automobile mounted 39 nominal volume of insulated gas cylinder of LNG, specified
Pressure is 9MPa, and pressure transmitter 26 is additionally provided on high pressure BOG storage tank 32, and pressure transmitter 26 passes through socket connector 27 and control
Molding block 4 connects, and control module 4 receives the pressure signal of pressure transmitter 26, is additionally provided with drain valve on high pressure BOG storage tank 32
28, drain valve 28 is connect with pressure reducing valve 29, by-passing valve 30 respectively, and pressure reducing valve 29,30 other end of by-passing valve are discharge outlet II31, row
It puts and is equipped with pressure gauge 38 at mouthful II31；The total measurement (volume) of boil-off gas collecting tank 9 is the total volume of collecting tank exocoel 12, is LNG
The 5% of automobile mounted 39 nominal volume of insulated gas cylinder, from the liquidometer upper limit 36 of double floating ball lever meters 15 to liquidometer lower limit
The volume for the collecting tank inner cavity 13 that position 37 is included is the dischargeable capacity of boil-off gas collecting tank 9, effective appearance of boil-off gas collecting tank 9
Product is not less than 3L.
Control module 4 controls the folding direction of three-way magnetic valve 6, and an access of three-way magnetic valve 6 passes through check valve I8
Towards boil-off gas collecting tank 9, another access then passes through discharge outlet I7 and is directly discharged in air；When 6 power loss of three-way magnetic valve
Towards the path blockade of boil-off gas collecting tank 9, the access towards discharge outlet I7 is opened, i.e., when system powers off suddenly, LNG automobile
The BOG that vehicle-mounted insulated gas cylinder generates is directly discharged to atmosphere, ensures that pressure is in safe range in gas cylinder and recovery system with this
It is interior；Conduit 14 is in the liquidometer upper limit 36 that one end outlet port outside boil-off gas collecting tank 9 is higher than double floating ball lever meters 15,
One end export direction that conduit 14 is located in collecting tank inner cavity 13 is upward, and outlet horizontal position is not less than 13 bottom of collecting tank inner cavity
Portion is connected to collecting tank exocoel 12, and BOG is imported into 13 bottom of collecting tank inner cavity, collected in a manner of bubble, prevent BOG by conduit 14
Leakage and air blending.
Boil-off gas storage module 3 is used to storing and recycling the height compressed by boil-off gas compression module 2 in the present embodiment
BOG is pressed, flange 24 and socket connector 27 are detachable, it can be unloaded from whole system, after high pressure BOG storage tank 32 is filled,
It puts it on LNG automobile, wherein storage high pressure BOG is depressurized by pressure reducing valve 29, can be used as the fuel supply of automobile, it can also
The BOG of collection is returned into gas station by by-passing valve 30.
The application method of the automobile mounted insulated gas cylinder boil-off gas recycling system of the present embodiment LNG is as follows:
Step 1: being that universal motor 20 is powered by alternating current 23, if the normal work of universal motor 20
Make, and the pressure in high pressure BOG storage tank 32 is not up to rated pressure, then checks collecting tank inner cavity by double floating ball lever meters 15
Water level in 13；
If 13 water level of collecting tank inner cavity is lower than liquidometer lower limit 37, control module 4 reminds user to collect boil-off gas
Water in tank 9 fills, while the access of three-way magnetic valve 6 towards discharge outlet I7 are opened, until user will be in boil-off gas collecting tank 9
Water fill, 4 stop alarm of control module；
If 13 water level of collecting tank inner cavity is not less than liquidometer lower limit 37, control module 4 is opened three-way magnetic valve 6 and is led to
The access of check valve I8, as check valve I8 is opened, boil-off gas BOG is passed through 13 bottom of collecting tank inner cavity by conduit 14, and will
The water of collecting tank inner cavity 13 is discharged to collecting tank exocoel 12, collecting tank exocoel 12 and the moisturizing drain 17 and atmosphere for passing through highest point
Connection, extra water can discharge outside the tank；
Step 2: with the continuous entrance of boil-off gas, 13 water level of collecting tank inner cavity reaches liquidometer lower limit 37, and liquid level is opened
It closes 16 and water level information is passed into control module 4, control module 4 controls universal motor 20 and starts, and drives compressor
The boil-off gas BOG collected in 9 inner cavity of boil-off gas collecting tank is pumped into high pressure BOG storage tank 32 by 21, as boil-off gas is pumped, is collected
13 liquid level of tank inner cavity increases, and the water in collecting tank exocoel 12 enters collecting tank inner cavity 13, and 12 liquid level of collecting tank exocoel declines, at this time
Moisturizing drain 17 sucks outside air, and water can also be added, and guarantees that 9 internal pressure of boil-off gas collecting tank is stablized, Zhi Daoshou
Collection 13 water level of tank inner cavity reaches liquidometer upper limit 36, and control module 4 controls universal motor 20 and stops working, and collects
Continue to collect boil-off gas BOG in tank inner cavity 13；
It is collected repeatedly until the pressure in high pressure BOG storage tank 32 reaches rated pressure, control module 4 receives pressure
After the pressure signal of transmitter 26, the control universal motor 21 of control module 4 stops working and three-way magnetic valve 6 leads to
The access of discharge outlet I7 is opened, control module 4 prompted in the form of status lamp shows amber light user replace high pressure BOG storage tank 32 or
Using the boil-off gas BOG collected in high pressure BOG storage tank 32, in use, can the combustion as automobile after the decompression of pressure reducing valve 29
The boil-off gas BOG of collection can also be returned to gas station by by-passing valve 30 by material supply, and pressure gauge 38 can be tested and be worked off one's feeling vent one's spleen
Whether body pressure meets the requirements.
In system work process, if 20 failure of DC dual-purpose motor or power failure, control module 4 controls threeway electromagnetism at this time
The access of valve 6 towards discharge outlet I7 are opened, and control module 4 prompts custom system failure in the form of status lamp shows red light.
Embodiment 2
A kind of automobile mounted insulated gas cylinder boil-off gas recycling system of LNG, as shown in figure 4,13 bottom of collecting tank inner cavity
It is connected to collecting tank exocoel 12 and is provided with several water holes 35 for 13 bottom sides of collecting tank inner cavity, the horizontal position in water hole 35 is lower than position
Lower limit 37 is counted, collecting tank inner cavity 13 is connected to by water hole 35 with collecting tank exocoel 12, the liquidometer upper limit of double floating ball lever meters 15
Position 36 is in the position of 13 total height 95% of collecting tank inner cavity, and liquidometer lower limit 37 is in 13 total height 15% of collecting tank inner cavity
Position；32 nominal volume of high pressure BOG storage tank is the 30% of automobile mounted 39 nominal volume of insulated gas cylinder of LNG, rated pressure
For 12MPa, the total measurement (volume) of boil-off gas collecting tank 9 is that the total volume of collecting tank exocoel 12 is the automobile mounted insulated gas cylinder 39 of LNG
The 7% of nominal volume, other component and connection type are same as Example 1, are universal motor 21 by battery 22
The automobile mounted insulated gas cylinder boil-off gas recycling of LNG may be implemented in power supply according to the method for embodiment 1.
The liquidometer upper limit 36 of double floating ball lever meters 15 is in 13 total height 85~95% of collecting tank inner cavity in the present invention
Position range in fluctuation, liquidometer lower limit 37 is in wave in the position range of 13 total height 10~15% of collecting tank inner cavity
It is dynamic；32 nominal volume of high pressure BOG storage tank fluctuates in 20~30% ranges of automobile mounted 39 nominal volume of insulated gas cylinder of LNG,
Its rated pressure is 9~12MPa, and total measurement (volume), that is, collecting tank exocoel 12 total measurement (volume) of boil-off gas collecting tank 9 is automobile mounted in LNG
5~7% ranges of 39 nominal volume of insulated gas cylinder, may be implemented function of the invention.
Claims (9)
1. a kind of automobile mounted insulated gas cylinder boil-off gas recycling system of LNG, which is characterized in that including boil-off gas collection module
(1), boil-off gas compression module (2), boil-off gas storage module (3)；
Boil-off gas collection module (1) includes flexible pipe (5), three-way magnetic valve (6), discharge outlet I (7), check valve I (8), boil-off gas
Collecting tank (9), check valve II (10), collecting tank inlet flange (11), conduit (14), double floating ball lever meters (15), liquidometer are opened
Close (16), moisturizing drain (17), sewage draining exit (18), collecting tank outlet(discharge) flange (19)；Boil-off gas collecting tank (9) is double-jacket
Structure, including collecting tank exocoel (12), collecting tank inner cavity (13), collecting tank inner cavity (13) bottom and collecting tank exocoel (12) are even
It is logical；
Boil-off gas compression module (2) includes compressor (20), universal motor (21), motor power；
Boil-off gas storage module (3) includes flange (24), check valve III (25), pressure transmitter (26), drain valve (28), subtracts
Pressure valve (29), by-passing valve (30), discharge outlet II (31), high pressure BOG storage tank (32), pressure gauge (38)；
Safety valve (40) discharge outlet that the automobile mounted insulated gas cylinder of LNG (39) discharges boil-off gas is powered by flexible pipe (5) with three
Magnet valve (6) connection, three-way magnetic valve (6) are also connect with discharge outlet I (7), check valve I (8) respectively, check valve I (8) and collecting tank
Inlet flange (11) connection, collecting tank inlet flange (11) other end connecting conduit (14), conduit (14) are collected into boil-off gas
The collecting tank exocoel 12 of tank (9), conduit (14) other end are crotch structure, and the top of crotch structure enters collecting tank inner cavity
(13), collecting tank exocoel (12), collecting tank inner cavity (13) are provided with water, and double floating ball lever meters are arranged in collecting tank inner cavity (13)
(15), double floating ball lever meters (15) connect with liquid-level switch (16), and collecting tank exocoel (12) bottom is equipped with sewage draining exit (18), collect
Moisturizing drain (17) are equipped at the top of tank exocoel (12), collecting tank exocoel (12) and collecting tank inner cavity (13) top exit are overlapped,
Ring flange (33) are arranged in exit, connection outlet pipeline on ring flange (33), and collecting tank outlet(discharge) flange is arranged on outlet conduit
(19), collecting tank outlet(discharge) flange (19) is connect with check valve II (10), and check valve II (10) is connect with compressor (20) one end, pressure
Contracting machine (20) is connect with universal motor (21), and universal motor (21) is connect with motor power；Compression
Machine (20) other end connecting flange (24), flange (24) are connect with check valve III (25), and check valve III (25) and high pressure BOG are stored up
Tank (32) connects, and is additionally provided with pressure transmitter (26) on high pressure BOG storage tank (32), is additionally provided with discharge on high pressure BOG storage tank (32)
Valve (28), drain valve (28) are connect with pressure reducing valve (29), by-passing valve (20) respectively, pressure reducing valve (29), by-passing valve (30) other end
For discharge outlet II (31), pressure gauge (38) are equipped at discharge outlet II (31).
2. the automobile mounted insulated gas cylinder boil-off gas recycling system of LNG according to claim 1, which is characterized in that also wrap
Include control module (4), control module (4) be regular market purchase controller, control module (4) respectively with three-way magnetic valve (6), liquid level
Meter switch (16), universal motor (21), pressure transmitter (26) connection.
3. the automobile mounted insulated gas cylinder boil-off gas recycling system of LNG according to claim 1, which is characterized in that flange
Disk (33) is fixed on collecting tank exocoel (12) exit edge by bolt (34).
4. the automobile mounted insulated gas cylinder boil-off gas recycling system of LNG according to claim 1, which is characterized in that double floating
The liquidometer upper limit (36) of ball liquidometer (15) is in the position of collecting tank inner cavity (13) total height 85~95%, under liquidometer
Limit (37) is in the position of collecting tank inner cavity (13) total height 10~15%.
5. the automobile mounted insulated gas cylinder boil-off gas recycling system of LNG according to claim 1, which is characterized in that collect
Tank inner cavity (13) side lower is provided with guide hole, and conduit (14) enters collecting tank inner cavity (13) from guide hole.
6. the automobile mounted insulated gas cylinder boil-off gas recycling system of LNG according to claim 1, which is characterized in that electronic
Electromechanical source is battery (22) or alternating current (23).
7. the automobile mounted insulated gas cylinder boil-off gas recycling system of LNG according to claim 4, which is characterized in that collect
Tank inner cavity (13) bottom and collecting tank exocoel (12) mode of communicating are as follows: the complete hollow out in collecting tank inner cavity (13) bottom, hollow out bottom
Horizontal position is lower than liquidometer lower limit (37)；Or collecting tank inner cavity (13) bottom sides are provided with several water holes (35), water hole
(35) horizontal position is lower than liquidometer lower limit (37).
8. the automobile mounted insulated gas cylinder boil-off gas recycling system of LNG according to claim 4, which is characterized in that evaporation
The total measurement (volume) of gas collecting tank (9) is the 5~7% of the automobile mounted insulated gas cylinder of LNG (39) nominal volume；Boil-off gas collecting tank (9)
Dischargeable capacity be not less than 3L, from the liquidometer upper limit (36) of double floating ball lever meters (15) to its liquidometer lower limit (37) institute
The volume for the collecting tank inner cavity (13) for including is the dischargeable capacity of boil-off gas collecting tank (9).
9. the automobile mounted insulated gas cylinder boil-off gas recycling system of LNG according to claim 1, which is characterized in that high pressure
BOG storage tank (32) nominal volume is the 20~30% of the automobile mounted insulated gas cylinder of LNG (39) nominal volume, rated pressure 9
~12MPa.
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| CN201910916189.1A CN110529742B (en) | 2019-09-27 | 2019-09-27 | LNG automobile-mounted heat-insulation gas cylinder evaporation gas recycling system |
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| CN201910916189.1A CN110529742B (en) | 2019-09-27 | 2019-09-27 | LNG automobile-mounted heat-insulation gas cylinder evaporation gas recycling system |
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| CN110529742B CN110529742B (en) | 2020-11-24 |
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