CN112460474A - LNG filling device and filling method - Google Patents
LNG filling device and filling method Download PDFInfo
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- CN112460474A CN112460474A CN201910849468.0A CN201910849468A CN112460474A CN 112460474 A CN112460474 A CN 112460474A CN 201910849468 A CN201910849468 A CN 201910849468A CN 112460474 A CN112460474 A CN 112460474A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 290
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 238000002309 gasification Methods 0.000 claims abstract description 5
- 239000006200 vaporizer Substances 0.000 claims description 23
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 239000003949 liquefied natural gas Substances 0.000 description 146
- 239000007789 gas Substances 0.000 description 52
- 239000012071 phase Substances 0.000 description 24
- 239000007791 liquid phase Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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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
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
-
- 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
-
- 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
- F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
-
- 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
- F17C13/04—Arrangement or mounting of valves
-
- 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
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
-
- 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
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides an LNG filling device and an LNG filling method. The LNG filling device comprises a storage tank, at least two liquid adding storage tanks and pressurizing equipment, wherein the liquid adding storage tanks and the pressurizing equipment are arranged in parallel. The storage tank is provided with a liquid inlet, a first liquid outlet, a second liquid outlet and a gas inlet; the liquid inlet is used for being connected with a liquid discharging port of the tank wagon to receive LNG in the tank wagon; each liquid adding storage tank is provided with a liquid inlet end, a liquid outlet end and a pressurizing end; the liquid inlet end is connected with a first liquid outlet of the storage tank to receive LNG in the storage tank, and the liquid outlet end is used for outputting the LNG outwards for filling; when at least one liquid adding storage tank receives LNG in the storage tank, the rest liquid adding storage tanks can output the LNG outwards; the pressurizing equipment is connected with the second liquid outlet of the storage tank to receive the LNG in the storage tank, and forms a gas-phase medium after gasification and pressurization, and the gas-phase medium is conveyed to the storage tank to increase the pressure in the storage tank; the pressurizing device also conveys the gas-phase medium to the charging storage tank.
Description
Technical Field
The invention relates to the technical field of liquefied natural gas filling, in particular to an LNG filling device and an LNG filling method.
Background
With the change of energy structure and the increasing of environmental protection in China, the development and the utilization of liquefied natural gas (LNG for short) are rapidly developed. The liquefied natural gas is taken as the best energy in the world at present, has been paid high attention to the selection of urban gas sources in China, and the vigorous popularization of the liquefied natural gas has become an energy policy in China.
At present, LNG filling mainly adopts a low-temperature immersed pump to fill LNG into a liquid filling machine, and further LNG is provided for users. However, the low-temperature immersed pump is expensive, the technical content of the low-temperature immersed pump is high, the maintenance difficulty is high, and 98% of the conventional low-temperature immersed pumps depend on import of few countries and have potential industrial risk hazards.
Disclosure of Invention
The invention aims to provide an LNG filling device and an LNG filling method with low price, and aims to solve the problems in the prior art.
In order to solve the above problems, the present invention provides an LNG refueling apparatus, comprising: a storage tank having a liquid inlet, a first liquid outlet, a second liquid outlet, and a gas inlet; the liquid inlet is used for being connected with a liquid discharging port of the tank wagon to receive LNG in the tank wagon; at least two liquid adding storage tanks arranged in parallel, wherein each liquid adding storage tank is provided with a liquid inlet end, a liquid outlet end and a pressurization end; the liquid inlet end is connected with a first liquid outlet of the storage tank to receive LNG in the storage tank, and the liquid outlet end is used for outputting LNG outwards for filling; when at least one liquid adding storage tank receives LNG in the storage tank, the rest liquid adding storage tanks can output the LNG outwards; the pressurization equipment is connected with the second liquid outlet of the storage tank to receive the LNG in the storage tank, gasifies and pressurizes the LNG to form a gas-phase medium, and conveys the gas-phase medium to the storage tank so as to increase the pressure in the storage tank and ensure that a pressure difference exists between the storage tank and the liquid charging storage tank to convey the LNG in the storage tank to the liquid charging storage tank; the pressurizing equipment also conveys the gas-phase medium to the liquid adding storage tank through the pressurizing end so as to increase the pressure in the liquid adding storage tank and enable the liquid adding storage tank to output LNG outwards.
In one embodiment, the pressurization device comprises a gasifier and a compressor; the gasifier has an inlet end and an outlet end, and the compressor has an inlet end and an outlet end; the inlet end of the vaporizer is connected with the second liquid outlet of the storage tank, and the vaporizer vaporizes the LNG conveyed by the storage tank to form gas; the inlet end of the compressor is connected with the outlet end of the gasifier, the compressor pressurizes the gas output by the gasifier to form the gas-phase medium, and the outlet end of the compressor is connected with the gas inlet of the storage tank and the pressurizing end of the liquid adding storage tank.
In one embodiment, the outlet end of the compressor is further connected to a liquid inlet of the storage tank, so as to deliver a liquid-phase medium formed after the gas output by the vaporizer is pressurized by the compressor to the storage tank.
In one embodiment, the outlet end of the gasifier is further connected with a pressurization port of the tank wagon, so that the gas output by the gasifier is conveyed to the tank wagon to increase the pressure of the tank wagon.
In one embodiment, the liquid charging storage tank further has an air return port, and the outlet end of the vaporizer is further connected to the air return port of the liquid charging storage tank, so as to deliver the gas output by the vaporizer to the liquid charging storage tank.
In one embodiment, the LNG refueling apparatus further includes a pressure regulating device; the storage tank is also provided with an air outlet; the pressure regulating device is connected with the gas outlet of the storage tank, receives the BOG conveyed by the storage tank, and conveys the BOG to the gas phase port of the tank car after pressurization and gasification so as to increase the pressure of the tank car.
In one embodiment, the inlet end of the pressure regulating device is further configured to be connected to a gas port of the tanker to receive the LNG in the tanker, and the pressure regulating device pressurizes and gasifies the LNG conveyed by the tanker and then conveys the LNG to the liquid inlet of the storage tank.
In one embodiment, the LNG refueling apparatus further comprises an unloading pressurization facility; the unloading pressurization equipment receives the LNG in the tank wagon, and conveys the LNG to a gas phase port of the tank wagon after pressurization so as to increase the pressure in the tank wagon.
The invention also provides an LNG filling method, which comprises the following steps:
providing a storage tank and at least two liquid adding storage tanks;
receiving, by the storage tank, LNG offloaded by a tanker;
gasifying and pressurizing LNG in the storage tank, conveying the LNG to the storage tank, pressurizing the storage tank to enable a pressure difference to exist between the storage tank and the liquid adding storage tank, and filling the LNG in the storage tank to the liquid adding storage tank;
gasifying and pressurizing LNG in the storage tank, conveying the LNG to the liquid adding storage tank, pressurizing the liquid adding storage tank to enable the liquid adding storage tank to have a pressure difference with a user, and conveying the LNG in the liquid adding storage tank to the user;
when at least one liquid adding storage tank receives the LNG in the storage tank, the residual liquid adding storage tank is used for filling the LNG outwards.
In one embodiment, the method further comprises the following steps: receiving the LNG unloaded from the tanker through the liquid feeding storage tank.
According to the technical scheme, the invention has the advantages and positive effects that:
the LNG filling device comprises a storage tank, a pressurizing device and at least two liquid filling storage tanks which are arranged in parallel. The storage tank receives LNG in the tank wagon, the liquid feeding storage tank provides LNG for the user so as to fill, and the functions of the storage tank and the liquid feeding storage tank are mutually independent, so that the LNG filling device can receive unloading of LNG in the tank wagon and filling of LNG to the user at the same time, and time is saved. Filling LNG for the liquid feeding storage tank in proper order through storing the storage tank, and when wherein at least one liquid feeding storage tank received the LNG in the storage tank, remaining liquid feeding storage tank can outwards export LNG for this LNG filling device can keep having the liquid feeding storage tank outwards to export LNG continuously, and then can be continuous outwards exports LNG. The LNG filling device adopts the pressure difference to fill the LNG to the user, does not need to adopt a low-temperature immersed pump, reduces the cost of the LNG filling device, and ensures that the price of the LNG filling device is lower.
The LNG filling method receives LNG of the tank car through the storage tank, increases the pressure in the liquid adding storage tank through the pressurizing equipment, and outputs the LNG in the liquid adding storage tank outwards through the pressure difference. The liquid adding storage tanks are sequentially filled with liquid through the storage tanks, and when one of the liquid adding storage tanks is filled with liquid, the rest liquid adding storage tanks output LNG outwards, so that the LNG is ensured to be output outwards by the liquid adding storage tanks in turn, and the LNG filling method can continuously and outwards fill LNG.
Drawings
Fig. 1 is a schematic structural view of an LNG refueling apparatus according to the present invention.
The reference numerals are explained below: 1. an LNG filling device; 11. a storage tank; 111. a liquid inlet; 112. a first liquid outlet; 113. an air outlet; 114. a second liquid outlet; 115. an air inlet; 12. a first liquid adding storage tank; 121. a liquid inlet end; 122. a liquid outlet end; 123. a gas return end; 124. a pressurizing end; 13. a second liquid adding storage tank; 131. a liquid inlet end; 132. a liquid outlet end; 133. a gas return end; 134. a pressurizing end; 14. a pressurizing device; 141. a gasifier; 142. a compressor; 151. a compressor; 152. a first input line; 153. a second input line; 154. a first output line; 155. a second output line; 16. unloading the supercharging device; 17. a liquid adding machine.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
The present invention provides an LNG refueling apparatus 1 for storing LNG delivered from a tank car and supplying the LNG to a user.
The tanker is used to supply LNG to the LNG refueling apparatus 1. Specifically, the tank wagon has a liquid discharge port, a gas phase port and a pressurization port.
Referring to fig. 1, the LNG refueling apparatus 1 of the present invention includes a storage tank 11, a refueling tank, a pressurizing device 14, a pressure regulating device, an unloading pressurizing device 16, and a refueling machine 17.
The storage tank 11 has a liquid inlet 111, a first liquid outlet 112, a gas outlet 113, a second liquid outlet 114, and a gas inlet 115.
Specifically, the storage tank 11 includes a tank body and a piping system. The tank body is provided with an opening, and the pipeline system is connected with the opening to further realize the communication with the interior of the tank body.
The pipeline system comprises an unloading main pipeline, a first liquid outlet pipeline, a second liquid outlet pipeline, a gas outlet pipeline and a gas inlet pipeline.
The inlet 111 of the storage tank 11 is connected to the liquid discharge port of the tanker to receive LNG from the tanker. In this embodiment, the liquid inlet 111 of the storage tank 11 is connected to the storage tank 11 and the tank car through the unloading main pipeline. A stop valve, a one-way valve and a pneumatic valve are sequentially arranged on the liquid discharging main pipeline along the direction from the upstream to the downstream. Wherein the upstream to downstream direction refers to the direction of media flow. The medium flowing direction in the liquid discharge main pipe means a direction from the tank car to the storage tank 11.
The check valve only allows LNG to be delivered to the storage tank 11 by the tanker and does not allow LNG in the storage tank 11 to be delivered to the tanker.
In this embodiment, the liquid inlet 111 includes an upper liquid inlet and a lower liquid inlet. Along the direction of height of the tank body, the upper liquid inlet is arranged on the upper part of the tank body, and the lower liquid inlet is arranged on the lower part of the tank body. The upper liquid inlet and the lower liquid inlet are both communicated with a liquid discharging main pipeline. And pneumatic valves are arranged at the upper liquid inlet and the lower liquid inlet and respectively control the on-off of the upper liquid inlet and the lower liquid inlet and the liquid discharging main pipeline.
The first liquid outlet 112 is connected to a first liquid outlet pipeline, and a pneumatic valve is disposed on the first liquid outlet pipeline to control on/off between the first liquid outlet pipeline and the storage tank 11.
The second liquid outlet 114 is connected to a second liquid outlet pipeline, and a pneumatic valve is disposed on the second liquid outlet pipeline to control the connection and disconnection between the second liquid outlet pipeline and the storage tank 11.
The first liquid outlet 112 and the second liquid outlet 114 both output the liquid in the storage tank 11, so that a liquid outlet can be formed on the tank body, and then a liquid outlet main pipeline is connected, and the first liquid outlet 112 and the second liquid outlet 114 are both disposed on the liquid outlet main pipeline. The first liquid outlet 112 and the second liquid outlet 114 can also be directly opened on the tank body.
The air outlet 113 is connected with an air outlet pipeline, and a pneumatic valve is arranged on the air outlet pipeline to control the connection and disconnection between the air outlet pipeline and the storage tank 11.
The air inlet 115 is connected with an air inlet pipeline, and a pneumatic valve is arranged on the air inlet pipeline to control the connection and disconnection between the air inlet pipeline and the storage tank 11.
The pressure regulating device is used for regulating the pressure between the storage tank 11 and the tanker.
Specifically, the pressure regulating device has an inlet end and an outlet end. The inlet of the pressure regulating device is connected to the gas outlet pipeline and the gas outlet 113 of the storage tank 11 to receive the BOG (flash gas) in the storage tank 11, thereby reducing the pressure in the storage tank 11. The pressure regulating device raises the pressure of the received gas-phase substance to form high-pressure gas. The outlet end of the pressure regulating device is connected with a gas phase port of the tank car, so that high-pressure gas is conveyed into the tank car to increase the pressure in the tank car.
The inlet end of the pressure regulating device is also used for being connected with a gas phase port of the tank car so as to receive the residual LNG after the liquid is discharged from the tank car, the pressure regulating device pressurizes the residual LNG to form a liquid phase substance, and the recovery of the residues in the tank car is completed. The outlet end of the pressure regulating device is connected with the liquid inlet 111 of the storage tank 11, and the pressurized liquid phase substance is conveyed into the storage tank 11.
Specifically, in the present embodiment, the pressure adjusting device includes a compressor 151, a first input pipe 152, a second input pipe 153, a first output pipe 154, and a second output pipe 155.
The first input pipeline 152 has one end connected to the inlet end of the compressor 151 and the other end connected to the gas phase port of the tank car. The first input line 152 is provided with a first valve and a second valve, the second valve is close to the inlet end of the compressor 151, and the first valve is far from the inlet end of the compressor 151.
The second supply line 153 is arranged in parallel with the first supply line 152. One end of the second input line 153 is connected to the first input line 152 and is located between the second valve and the inlet end of the compressor 151. The other end of the second input line 153 is connected to the gas outlet line and to the gas outlet 113 of the storage tank 11. The second input line 153 is provided with a third valve.
The first output pipeline 154 has one end connected to the outlet end of the compressor 151 and the other end connected to the liquid inlet pipeline and connected to the liquid inlet 111 of the storage tank 11. A fourth valve is provided on the first output line 154.
The second output line 155 is arranged in parallel with the first output line 154. One end of the second output line 155 is connected between the first valve and the second valve, and the other end of the second output line 155 is connected between the outlet end of the compressor 151 and the third valve. A fifth valve is disposed on the second output line 155.
In this embodiment, the first valve, the second valve, the third valve, the fourth valve and the fifth valve are all stop valves.
The unloading pressurization device 16 is used for pressurizing the tanker to transfer the LNG in the tanker to the storage tank 11. Specifically, the unloading pressurization device 16 has an inlet end and an outlet end. The inlet end of the unloading pressurization device 16 is used for connecting with the pressurization port of the tanker to receive the LNG in the tanker. The unloading pressurization facility 16 pressurizes the LNG to form a gaseous medium. The outlet end of the unloading pressurization equipment 16 is used for connecting a gas phase port of the tank car, and a gas phase medium formed after pressurization by the unloading pressurization equipment 16 is conveyed into the tank car, so that the pressure in the tank car is increased, and LNG in the tank car can be smoothly conveyed to the storage tank 11.
In this embodiment, the unloading pressurization device 16 includes a vaporizer, an unloading pressurization input pipeline, and an unloading pressurization output pipeline.
One end of the unloading pressurization input pipeline is used for connecting a pressurization port of the tank car, and the other end of the unloading pressurization input pipeline is connected with an inlet end of the gasifier. And a sixth valve is arranged on the unloading pressurization input pipeline.
One end of the unloading pressurization output pipeline is connected with the outlet end of the gasifier, the other end of the unloading pressurization output pipeline is connected with the first input pipeline of the pressure regulating device and is connected with the gas phase port of the tank car, and the unloading pressurization output pipeline is located between the inlet end of the compressor and the second valve. And a seventh valve is arranged on the unloading pressurization output pipeline.
The liquid filling storage tank is used for receiving LNG and conveying the LNG to the liquid filling machine 17, and further filling LNG to a user. The liquid feeding storage tank is provided with a liquid inlet end, a liquid outlet end, a pressurization end and an air return end. And the liquid inlet end, the liquid outlet end, the pressurization end and the air return end are all provided with stop valves.
The liquid inlet end of the liquid feeding storage tank is connected with the liquid outlet pipeline of the storage tank 11, and further communicated with the liquid outlet of the storage tank 11 to receive the LNG in the storage tank 11.
Further, the liquid inlet end of the liquid feeding pipeline is also connected with a liquid discharging port of the tank car so as to receive LNG in the tank car. Specifically, in this embodiment, a liquid unloading branch pipeline is further connected between the liquid unloading main pipeline and the first liquid outlet pipeline, so that the LNG in the tank car can be directly conveyed to the liquid feeding pipeline. The liquid discharging branch pipeline is provided with a pneumatic valve to control the on-off between the liquid discharging main pipeline and the first liquid outlet pipeline.
Specifically, the liquid inlet end of the liquid adding storage tank is similar to the liquid inlet 111 of the storage tank 11, and an upper liquid inlet end and a lower liquid inlet end are respectively arranged in the height direction along the tank body of the liquid adding storage tank. The upper liquid inlet end is arranged at the upper part of the tank body of the liquid adding storage tank, and the lower liquid inlet end is arranged at the lower part of the tank body of the liquid adding storage tank. And stop valves are arranged at the upper liquid inlet end and the lower liquid inlet end.
The liquid filling storage tank has a liquid level preset value, and when the liquid level in the liquid filling storage tank is lower than the liquid level preset value, the LNG is filled into the liquid filling storage tank through the storage tank 11. Specifically, the level preset value is set to 1/3 level of the charging tank level. The liquid level of the liquid feeding storage tank indicates the maximum height of the liquid in the liquid feeding storage tank.
The liquid adding storage tank also has a working pressure, and when the pressure in the liquid adding storage tank reaches the working pressure, the liquid adding storage tank can output LNG outwards. Specifically, the working pressure was 1.6 MPa.
Specifically, in this embodiment, the number of the liquid adding storage tanks is two, and the two liquid adding storage tanks are the first liquid adding storage tank 12 and the second liquid adding storage tank 13, and the first liquid adding storage tank 12 and the second liquid adding storage tank 13 are arranged in parallel. The first liquid adding storage tank 12 is sequentially provided with a liquid inlet end 121, a liquid outlet end 122, a gas return end 123 and a pressurizing end 124. The second charging storage tank 13 is sequentially provided with a liquid inlet end 131, a liquid outlet end 132, a gas return end 133 and a pressurizing end 134. In other embodiments, the number of the filling tanks can be three or other numbers, and can be set according to actual needs. And the liquid feeding storage tanks are arranged in parallel.
The first liquid adding storage tank 12 and the second liquid adding storage tank 13 are arranged in parallel, so that the first liquid adding storage tank 12 and the second liquid adding storage tank 13 alternately receive liquid filling and fill LNG outwards, namely when the LNG in the first liquid adding storage tank 12 is lower than a liquid level preset value, the first liquid adding storage tank 12 stops filling LNG outwards and starts to receive the liquid filling of the storage tank 11; at this time, the second charging tank 13 is filled with LNG to the user. After the first liquid adding storage tank 12 is filled, LNG can be filled outwards when the second liquid adding storage tank 13 receives the liquid, so that the first liquid adding storage tank 12 and the second liquid adding storage tank 13 are alternately used, and continuous filling is realized.
The pressurization device 14 is used to pressurize the storage tank 11, the charging tank, and the tanker. Specifically, the pressurization device 14 includes a gasifier 141 and a compressor 142.
The vaporizer 141 has an inlet end and an outlet end, the inlet end of the vaporizer 141 constituting the liquid phase inlet of the pressurizing device 14. The inlet of the vaporizer 141 is connected to the liquid phase output line and to the second outlet 114 of the storage tank 11 to receive the LNG in the storage tank 11. The vaporizer 141 vaporizes LNG to form a gas. The outlet end of the vaporizer 141 outputs the gas vaporized by the vaporizer to the outside.
The outlet end of the vaporizer 141 is connected to the pressurization port of the tank wagon to deliver the gas vaporized by the vaporizer 141 into the tank wagon, thereby increasing the pressure in the tank wagon, so that the tank wagon and the storage tank 11 have a pressure difference, and the LNG in the tank wagon is smoothly unloaded to the storage tank 11.
The compressor 142 has an inlet end, a gas phase outlet end, and a liquid phase outlet end. The vapor phase outlet end of compressor 142 forms the vapor phase outlet end of compression device 14 and the liquid phase outlet end of compressor 142 forms the liquid phase outlet end of compression device 14.
The inlet end of the compressor 142 is connected to the outlet end of the gasifier 141 to receive the gas output from the gasifier 141. The compressor 142 pressurizes the gas to form a gaseous medium. An air-operated valve is connected between the inlet end of the compressor 142 and the outlet end of the vaporizer 141.
The gas phase outlet end of the compressor 142 is connected with a first gas phase branch pipeline and a second gas phase branch pipeline.
The first gas branch pipeline of the compressor 142 is connected to the gas inlet pipeline of the storage tank 11 to deliver the gas-phase medium to the storage tank 11, so as to increase the pressure in the storage tank 11, so that a pressure difference exists between the storage tank 11 and the liquid filling tank, and further the storage tank 11 delivers the LNG to the liquid filling tank.
The second gas phase branch pipeline of the compressor 142 connects the pressurization end 123 of the first liquid adding storage tank 12 and the pressurization end 134 of the second liquid adding storage tank 13 to convey gas phase medium to the first liquid adding storage tank 12 and the second liquid adding storage tank 13, so as to increase the pressure in the first liquid adding storage tank 12 and the second liquid adding storage tank 13, so that a pressure difference exists between the first liquid adding storage tank 12 and the second liquid adding storage tank 13 and the liquid adding machine 17, and further, the first liquid adding storage tank 12 and the second liquid adding storage tank 13 can output LNG.
The liquid phase outlet end of the compressor 142 is connected to the liquid inlet pipeline of the storage tank 11 to convey the liquid phase medium output by the compressor 142 into the storage tank 11.
The charger 17 is used for receiving the LNG of the charging storage tank and providing the LNG to the user. Specifically, the liquid charger 17 has a liquid input, a liquid output, and a gas output.
The liquid input end of the liquid adding machine 17 is connected with the liquid outlet end of the liquid adding storage tank to receive the LNG.
The liquid outlet of the charger 17 is used for connection with a user to provide LNG to the user.
The gas output end of the liquid adding machine 17 is connected with the gas return end of the liquid adding storage tank so as to convey BOG generated by the liquid adding machine 17 back to the liquid adding storage tank, and the device is green and environment-friendly.
Further, the LNG refueling apparatus 1 of the present embodiment further includes a first base and a second base. The unloading pressurization device 16, the pressure regulating device and the related pipelines are integrated on the first base to form the unloading sledge. The charging reservoir, pressurizing device 14 and associated piping are integrated on the second base to form a charging skid. By adopting the scheme, the LNG filling device 1 is modularized and convenient to install.
The filling method of the LNG filling device 1 of the present invention is as follows:
s1, receiving the LNG offloaded by the tanker through the storage tank 11.
Specifically, the pneumatic valve on the air outlet pipeline of the storage tank 11, the third valve on the second input pipeline of the pressure regulating device, the fifth valve on the second output pipeline and the first valve on the first input pipeline are firstly opened, so that the gas phase port of the tank wagon is communicated with the gas outlet 113 of the storage tank 11, the BOG in the storage tank 11 enters the tank wagon after the pressurization effect of the pressure regulating device, and the pressure of the tank wagon and the storage tank 11 is balanced, so that the pressure of the tank wagon and the pressure of the storage tank 11 are close to each other.
And then, opening a sixth valve on the unloading pressurization input pipeline, a seventh valve on the unloading output pipeline, and a first valve and a second valve on the first input pipeline, so that the gas-phase medium in the tank wagon enters the unloading pressurization equipment 16, is pressurized by the unloading pressurization equipment 16, and is conveyed to a gas-phase port of the tank wagon, the pressure in the tank wagon is increased, the pressure difference between the tank wagon and the storage tank 11 is formed, and the LNG in the tank wagon is conveyed to the storage tank 11.
And S2, filling the LNG in the storage tank 11 to the first filling storage tank 12.
When the liquid level in the first charging tank 12 is lower than the predetermined liquid level, the storage tank 11 charges the first charging tank 12.
Specifically, the pneumatic valves on the second liquid outlet pipeline and the pneumatic valves on the air inlet pipeline of the storage tank 11 are opened, so that the LNG enters the pressurizing device 14, and then enters the storage tank 11 after gasification and pressurization, the pressure in the storage tank 11 is increased, so that the storage tank 11 and the first liquid adding storage tank 12 have a pressure difference, and the LNG in the storage tank 11 is conveyed to the first liquid adding storage tank 12 by using the pressure difference.
S3, the first priming reservoir 12 is pressurized.
After the first liquid adding storage tank 12 finishes the liquid filling process, the pneumatic valve on the second liquid outlet pipeline of the storage tank 11 and the stop valve at the upper pressurizing end of the first liquid adding storage tank 12 are opened, so that the LNG in the storage tank 11 enters the pressurizing device 14, enters the first liquid adding storage tank 12 after gasification and pressurization, the pressure in the first liquid adding storage tank 12 is increased, and the LNG in the first liquid adding storage tank 12 is conveyed to the liquid adding machine 17 by utilizing the pressure difference.
And S4, the second filling storage tank 13 delivers LNG to the outside.
The LNG is provided to the user by the second charging tank filling the charger 17 with LNG while the first charging tank 12 receives LNG and pressurization in the storage tank 11.
That is, S4 may be performed while performing S2 and S3.
According to the LNG filling method, the storage tank 11 is used for receiving LNG of the tank car, the pressure in the first liquid adding storage tank 12 and the pressure in the second liquid adding storage tank 13 are increased through the pressurizing device 14, the LNG is output outwards through pressure difference, and the two processes are independent from each other, so that the LNG filling method can be carried out simultaneously, and time is saved. In the LNG filling method, the first liquid adding storage tank 12 and the second liquid adding storage tank 13 are alternately filled by the storage tank 11, and the first liquid adding storage tank 12 and the second liquid adding storage tank 13 alternately perform an outward filling process, so that the LNG filling method continuously fills LNG outwards.
According to the technical scheme, the invention has the advantages and positive effects that:
the LNG filling device comprises a storage tank, a pressurizing device and at least two liquid filling storage tanks which are arranged in parallel. The storage tank receives LNG in the tank wagon, the liquid feeding storage tank provides LNG for the user so as to fill, and the functions of the storage tank and the liquid feeding storage tank are mutually independent, so that the LNG filling device can receive unloading of LNG in the tank wagon and filling of LNG to the user at the same time, and time is saved. Filling LNG for the liquid feeding storage tank in proper order through storing the storage tank, and when wherein at least one liquid feeding storage tank received the LNG in the storage tank, remaining liquid feeding storage tank can outwards export LNG for this LNG filling device can keep having the liquid feeding storage tank outwards to export LNG continuously, and then can be continuous outwards exports LNG. The LNG filling device adopts the pressure difference to fill the LNG to the user, does not need to adopt a low-temperature immersed pump, reduces the cost of the LNG filling device, and ensures that the price of the LNG filling device is lower.
The LNG filling method receives LNG of the tank car through the storage tank, increases the pressure in the liquid adding storage tank through the pressurizing equipment, and outputs the LNG in the liquid adding storage tank outwards through the pressure difference. The liquid adding storage tanks are sequentially filled with liquid through the storage tanks, and when one of the liquid adding storage tanks is filled with liquid, the rest liquid adding storage tanks output LNG outwards, so that the LNG is ensured to be output outwards by the liquid adding storage tanks in turn, and the LNG filling method can continuously and outwards fill LNG.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. An LNG filling apparatus, comprising:
a storage tank having a liquid inlet, a first liquid outlet, a second liquid outlet, and a gas inlet; the liquid inlet is used for being connected with a liquid discharging port of the tank wagon to receive LNG in the tank wagon;
at least two liquid adding storage tanks arranged in parallel, wherein each liquid adding storage tank is provided with a liquid inlet end, a liquid outlet end and a pressurization end; the liquid inlet end is connected with a first liquid outlet of the storage tank to receive LNG in the storage tank, and the liquid outlet end is used for outputting LNG outwards for filling; when at least one liquid adding storage tank receives LNG in the storage tank, the rest liquid adding storage tanks can output the LNG outwards;
the pressurization equipment is connected with the second liquid outlet of the storage tank to receive the LNG in the storage tank, gasifies and pressurizes the LNG to form a gas-phase medium, and conveys the gas-phase medium to the storage tank so as to increase the pressure in the storage tank and ensure that a pressure difference exists between the storage tank and the liquid charging storage tank to convey the LNG in the storage tank to the liquid charging storage tank; the pressurizing equipment also conveys the gas-phase medium to the liquid adding storage tank through the pressurizing end so as to increase the pressure in the liquid adding storage tank and enable the liquid adding storage tank to output LNG outwards.
2. The LNG refueling apparatus of claim 1 wherein the pressurization device comprises a vaporizer and a compressor; the gasifier has an inlet end and an outlet end, and the compressor has an inlet end and an outlet end;
the inlet end of the vaporizer is connected with the second liquid outlet of the storage tank, and the vaporizer vaporizes the LNG conveyed by the storage tank to form gas;
the inlet end of the compressor is connected with the outlet end of the gasifier, the compressor pressurizes the gas output by the gasifier to form the gas-phase medium, and the outlet end of the compressor is connected with the gas inlet of the storage tank and the pressurizing end of the liquid adding storage tank.
3. The LNG filling device according to claim 2, wherein the outlet of the compressor is further connected to an inlet of the storage tank for delivering a liquid medium formed by pressurizing the gas output from the vaporizer by the compressor to the storage tank.
4. The LNG refueling apparatus as recited in claim 2 wherein said outlet end of said vaporizer is further connected to a pressurization port of said tanker for delivering gas output from said vaporizer to said tanker for increasing the pressure of said tanker.
5. The LNG refueling apparatus as recited in claim 2, wherein the refueling storage tank further comprises a gas return port, and the outlet end of the vaporizer is further connected to the gas return port of the refueling storage tank to deliver the gas output from the vaporizer to the refueling storage tank.
6. The LNG refueling apparatus of claim 1, further comprising a pressure regulating device; the storage tank is also provided with an air outlet;
the pressure regulating device is connected with the gas outlet of the storage tank, receives the BOG conveyed by the storage tank, and conveys the BOG to the gas phase port of the tank car after pressurization and gasification so as to increase the pressure of the tank car.
7. The LNG filling apparatus of claim 6, wherein the inlet end of the pressure regulating device is further configured to be connected to a gas port of the tanker to receive the LNG in the tanker, and the pressure regulating device pressurizes and gasifies the LNG delivered by the tanker and then delivers the LNG to the liquid inlet of the storage tank.
8. The LNG refueling apparatus of claim 1 further comprising an unloading pressurization device;
the unloading pressurization equipment receives the LNG in the tank wagon, and conveys the LNG to a gas phase port of the tank wagon after pressurization so as to increase the pressure in the tank wagon.
9. A method of LNG refueling, comprising:
providing a storage tank and at least two liquid adding storage tanks;
receiving, by the storage tank, LNG offloaded by a tanker;
gasifying and pressurizing LNG in the storage tank, conveying the LNG to the storage tank, pressurizing the storage tank to enable a pressure difference to exist between the storage tank and the liquid adding storage tank, and filling the LNG in the storage tank to the liquid adding storage tank;
gasifying and pressurizing LNG in the storage tank, conveying the LNG to the liquid adding storage tank, pressurizing the liquid adding storage tank to enable the liquid adding storage tank to have a pressure difference with a user, and conveying the LNG in the liquid adding storage tank to the user;
when at least one liquid adding storage tank receives the LNG in the storage tank, the residual liquid adding storage tank is used for filling the LNG outwards.
10. The LNG refueling method according to claim 9, further comprising:
receiving the LNG unloaded from the tanker through the liquid feeding storage tank.
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| CN201910849468.0A CN112460474A (en) | 2019-09-09 | 2019-09-09 | LNG filling device and filling method |
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| CN201910849468.0A CN112460474A (en) | 2019-09-09 | 2019-09-09 | LNG filling device and filling method |
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Application publication date: 20210309 |