CN107388028B

CN107388028B - Synchronous filling system of many LNG tank casees

Info

Publication number: CN107388028B
Application number: CN201710663454.0A
Authority: CN
Inventors: 张冲; 霍志亮; 徐龙; 魏崇光; 陈斌
Original assignee: Jiangsu Xunlong Energy Co ltd; Suzhou Cypag Hydraulic Technology Co ltd
Current assignee: Jiangsu Xunlong Energy Co ltd; Suzhou Cypag Hydraulic Technology Co ltd
Priority date: 2017-08-05
Filing date: 2017-08-05
Publication date: 2022-12-27
Anticipated expiration: 2037-08-05
Also published as: CN107388028A

Abstract

The invention discloses a synchronous filling system for multiple LNG tanks, which comprises a main pipe, branch pipes and LNG tanks, wherein the main pipe is communicated with a liquid inlet end and a gas return end, the main pipe is communicated with one ends of the branch pipes, the other end of each branch pipe is a filling end, each filling end corresponds to one LNG tank in the same plane, each LNG tank is provided with a receiving end, and an automatic butt joint device is arranged between the filling end and the receiving end of each branch pipe. The automatic butt joint device realizes the communication between the filling end and the receiving end, namely the synchronous filling of a plurality of tank bodies can be realized through the main pipe, and the requirement of filling a plurality of tank boxes on a ship is met; the LNG tank is directly added into the LNG tank of the LNG tank transport ship in the gas field liquefaction factory, and the LNG tank transport ship can be directly transported through a flat car or a railway after unloading in the dangerous goods area of the container terminal.

Description

Synchronous filling system of many LNG tank casees

Technical Field

The invention relates to the field of LNG (liquefied natural gas) transportation, in particular to a synchronous filling system for multiple LNG tanks.

Background

LNG is an abbreviation for liquefied natural gas, which is a clean energy source and contributes to diversification of energy supply in energy consuming countries in terms of import; in the aspect of export, the natural gas production country is facilitated to effectively develop natural gas resources, foreign exchange income is increased, and national economic development is promoted.

Currently, coastal LNG projects which are planned and implemented in china are: guangdong, fujian, zhejiang, shanghai, jiangsu, shandong, liaoning, ningxia and Hebei Tangshan, etc., and finally form a coastal LNG receiving station and a conveying pipe network.

The conventional LNG medium-long distance transportation is finished by conveying bulk carriers from a gas field liquefaction factory to a coastal LNG receiving station, loading a tank car through a loading station of the receiving station, and transporting the tank car to a tail end unit storage tank through a land tank car to run back and forth.

The storage tank system of the LNG ship is generally classified into a self-supporting type and a membrane type, and both hulls can transport a large amount of LNG at a time. However, when the natural gas on such an LNG ship is transferred to a tanker (a vehicle for transporting LNG on land), the natural gas may be transferred by constructing an LNG receiving station because of the risk of liquefying the natural gas. With the construction scale of the current chinese LNG receiving station, rapid and large amount of LNG gas transmission to users cannot be realized in a short period of time.

However, in the conventional LNG ship, the LNG is filled after a filling line is connected to a large LNG tank by a loading and unloading arm disclosed in patent publication No. CN 103899915B. However, when a plurality of LNG tank boxes are arranged on a transport ship, the existing loading and unloading mode cannot realize synchronous and quick filling of the plurality of LNG tank boxes.

Disclosure of Invention

The invention aims to provide a multi-LNG tank synchronous filling system which has the advantage of synchronously filling a plurality of tanks.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a synchronous filling system of many LNG tank casees, includes house steward, branch pipe and LNG tank case, house steward intercommunication has feed liquor end and return gas end, house steward and the one end intercommunication of many branch pipes, each the other end of branch pipe is for annotating the end, and each is annotated and is held to correspond in the coplanar and have an LNG tank case, each be provided with the receiving terminal on the LNG tank case, be provided with automatic interfacing apparatus between notes end and the receiving terminal.

By adopting the technical scheme, the automatic butt joint device realizes the communication between the filling end and the receiving end, the low-pressure LNG in the main pipe is transmitted into each branch pipe, the automatic butt joint device realizes the butt joint communication between the filling end of the branch pipe and the LNG tank, namely, the synchronous filling of a plurality of tank bodies can be realized through the main pipe, and the requirement on the filling of a plurality of tank boxes on a ship is met.

Preferably, the branch pipe comprises a foldable filling pipe and a foldable return air pipe; the automatic butt joint device comprises a moving mechanism, and the moving mechanism drives the filling pipe and the return air pipe to extend in the space and is in free butt joint communication with the filling end.

By adopting the technical scheme, the automatic butt joint device enables the branch pipe to move and extend in the space, the filling pipe and the return air pipe are arranged in a foldable mode because the low-pressure LNG can only keep liquid state below minus 100 ℃, and the filling pipe and the return air pipe are extended in an extending mode in the butt joint process; meanwhile, the moving mechanism can also adopt a mechanical arm.

Preferably, the automatic butt joint device further comprises a first fixing plate and a second fixing plate, the receiving end comprises a female filling joint arranged on the first fixing plate, the female filling joint is communicated with the LNG tank, a male filling joint corresponding to the female filling joint is arranged on the second fixing plate, the male filling joint is respectively communicated with the filling pipe and the return air pipe, and the moving mechanism drives the male filling joint to be communicated with or disconnected from the female filling joint through linear reciprocating motion.

By adopting the technical scheme, the second fixing plate and the first fixing plate play a role in fixing the male filling joint and the female filling joint, and the stability and the structural strength during butt joint are ensured; meanwhile, the two male filling joints are respectively communicated with the filling pipe and the return air pipe, namely the male filling joint and the female filling joint are connected in the automatic butt joint process, so that the butt joint sealing performance is guaranteed.

Preferably, the automatic docking device further comprises a guide mechanism arranged on the second fixing plate, and a guide locking mechanism is arranged between the first fixing plate and the second fixing plate.

By adopting the technical scheme, the guide structure reduces the precision error in the pushing process of the linear motion mechanism; the guide locking mechanism enables the second fixing plate and the first fixing plate to be fixed after automatic butt joint, and the second fixing plate and the first fixing plate are prevented from being separated in the process of injecting low-pressure LNG.

Preferably, the guide mechanism includes a third fixing plate and a guide pillar, the moving mechanism includes a first oil cylinder fixed to the third fixing plate, a piston rod of the first oil cylinder penetrates through the third fixing plate and is connected to the second fixing plate, and one end of the guide pillar is connected to the second fixing plate and penetrates through the third fixing plate.

Through adopting above-mentioned technical scheme, the guide pillar plays the effect of direction at the in-process that first hydro-cylinder promoted, has improved the precision of second fixed plate and first fixed plate butt joint in-process, avoids public notes to connect and takes place the striking with female notes joint.

Preferably, the second fixing plate comprises a floating plate and an oil cylinder fixing block, the male filling joint is arranged on the floating plate, the guide pillar is arranged on the oil cylinder fixing block, and a floating centering mechanism is arranged between the floating plate and the oil cylinder fixing block.

By adopting the technical scheme, when the male filling joint and the female filling joint are butted, the lifting mechanism enables the male filling joint and the female filling joint to move relatively in the height direction, so that the problem of insufficient butting precision is caused, and after the male filling joint and the female filling joint are used for a long time, the male filling joint and the female filling joint are abraded; in the butt joint process, the floating centering mechanism enables the floating plate and the oil cylinder fixing block to move in the height direction, so that the concentricity of the male filling joint and the female filling joint is improved, and abrasion is reduced.

Preferably, the floating centering mechanism comprises a through hole, a fixing part and an elastic part; the through hole penetrates through the floating plate and the oil cylinder fixing block, the fixing part penetrates through the through hole, two ends of the fixing part in the length direction are larger than the diameter of the through hole, one end of the fixing part in the length direction is connected with a piston rod of the first oil cylinder and the oil cylinder fixing block respectively, and the other end of the fixing part in the length direction is abutted against the floating plate so as to limit the floating plate and the oil cylinder fixing block to move in the horizontal direction; one end of the elastic piece is connected with the floating plate, and the other end of the elastic piece is connected with the oil cylinder fixing block; and after the floating plate is subjected to acting force in the height direction, the elastic part enables the floating plate and the oil cylinder fixing block to move in the height direction.

By adopting the technical scheme, when the male filling joint is butted with the female filling joint, the lifting mechanism can cause the problem of insufficient butting precision, and the male filling joint and the female filling joint can be abraded after long-term use. In the butt joint process, after the floating plate and the oil cylinder fixing block are subjected to acting force in the height direction, the elastic part can stretch or compress, the floating plate moves in the height direction, the position of the female filling joint is changed, the male filling joint and the female filling joint are aligned in the height direction, the friction force between the male filling joint and the female filling joint is reduced, and abrasion is reduced.

Preferably, the guiding locking mechanism comprises a second oil cylinder, a locking rod arranged on the second fixing plate and a locking sleeve arranged on the first fixing plate, the locking rod is matched with the locking sleeve, a sliding cavity is arranged in the locking rod, a sliding part is connected in the sliding cavity in a sliding manner, a locking channel extends in the radial direction of the sliding cavity, a locking bead is connected in the locking channel in a rolling manner, a locking groove matched with the locking bead is arranged on the inner surface of the locking sleeve, an inclined surface abutted against the locking bead is arranged at one end of the sliding part, and the other end of the sliding part is connected with the second oil cylinder; the second oil cylinder pushes the sliding piece to slide, and then the inclined surface pushes the locking bead to protrude out of the outer surface of the locking rod and enable the locking bead to be embedded into the locking groove.

By adopting the technical scheme, the first oil cylinder pushes the floating plate to the first fixing plate, in the pushing process, the male filling joint is in butt joint communication with the female filling joint, the locking rod enters the locking sleeve, and then the second oil cylinder pushes the sliding piece to move in the sliding cavity, so that the locking ball is embedded into the locking groove, and the floating plate is prevented from being separated from the first fixing plate.

Preferably, be provided with elevating system on the house steward, elevating system includes lift platform and the third hydro-cylinder that promotes lift platform and go up and down, the house steward is including setting up the first pipeline in lift platform both sides, the house steward still includes the second pipeline of setting on lift platform, it has many connecting pipes through the rotary joint connection to communicate between first pipeline and the second pipeline.

By adopting the technical scheme, the LNG storage tank can be stacked with multiple layers in the height direction, so that the volume of the stored LNG is enlarged; meanwhile, the automatic butt joint device moves into the upper LNG tank box through the lifting of the lifting platform, and the LNG storage tank is filled in the height direction.

Another object of the present invention is to provide an LNG tank carrier that realizes the synchronous filling of multiple LNG tanks.

The technical purpose of the invention is realized by the following technical scheme: an LNG tank transport ship comprises a multi-LNG tank synchronous filling system.

Through adopting above-mentioned technical scheme, install many LNG tank case synchronous filling system additional on the LNG tank case transport ship, realized that gas field liquefaction mill directly adds LNG into the LNG tank incasement of LNG tank case transport ship, unload the back in the dangerous goods area of container terminal, can directly transport through flatbed or railway.

In conclusion, the invention has the following beneficial effects:

1. the automatic butt joint device realizes the communication between the filling end and the receiving end, namely the synchronous filling of a plurality of tank bodies can be realized through the main pipe, and the requirement of filling a plurality of tank boxes on a ship is met;

2. the LNG is directly added into the LNG tanks of the LNG tank transport ship by the gas field liquefaction factory, and the LNG tank transport ship can be directly transported by a flat car or a railway after unloading in the dangerous goods area of the container terminal;

3. the LNG ship does not load a large-scale LNG storage tank, but loads an LNG tank box, the LNG is filled into the LNG tank box on the ship at a filling dock of the LNG receiving station, then the LNG tank box is transported to a dangerous goods berth of a container dock by ship, and after the LNG ship is transported to the dock, the LNG tank box can be directly transported to a user by a flat-plate transport vehicle on land.

Drawings

FIG. 1 is a schematic view showing a positional relationship of a stage in embodiment 1;

fig. 2 is a schematic diagram showing a positional relationship between an LNG storage tank and an automatic docking apparatus in embodiment 1;

fig. 3 is a schematic structural view of an LNG storage tank in example 1;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic view showing the construction of an automatic docking apparatus according to embodiment 1;

FIG. 6 is a schematic sectional view of an automatic docking apparatus according to embodiment 1;

FIG. 7 is a cross-sectional schematic view of the locking rod and locking collar of embodiment 1;

FIG. 8 is a schematic structural view of a second fixing plate in embodiment 1;

FIG. 9 is a schematic structural view of the elevating platform in embodiment 1;

FIG. 10 is an enlarged view of portion B of FIG. 9;

FIG. 11 is a top view of the deck of embodiment 2;

figure 12 is a schematic cross-sectional view of a female fill joint of example 3.

In the figure, 1, a platform; 11. an LNG tank; 12. a storage module; 13. a tank body; 14. a frame structure; 15. a receiving end; 16. a first fixing plate; 17. A mother filling joint; 18. an electromagnetic control valve; 19. a second fixing plate; 2. a header pipe; 21. a rotating joint; 22. a low pressure LNG line; 23. a nitrogen gas pipe; 24. an instrument air tube; 26. A torch tube; 3. an automatic docking device; 31. a floating plate; 32. a male filling joint; 33. filling a pipe; 34. returning to the air pipe; 35. an oil cylinder fixing block; 36. a third fixing plate; 37. a first oil cylinder; 38. an aircraft joint; 39. an aviation socket; 4. a guide post; 41. a floating centering mechanism; 42. a through hole; 43. a fixed part; 44. an elastic member; 45. a first rotating block; 46. a second turning block; 5. a lifting module; 51. a first conduit; 52. a second conduit; 53. a connecting pipe; 54. a lifting platform; 55. a third oil cylinder; 6. a guide locking mechanism; 61. a locking lever; 62. a locking sleeve; 63. a sliding cavity; 64. a second cylinder; 65. a slider; 66. a locking channel; 67. a locking bead; 68. a bevel; 69. a locking groove; 7. deck 71, valve core; 72. a spring; 73. filtering holes and 74 vacuum thermal insulation cavities.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Example 1: as shown in fig. 1 and 2, the present invention provides a synchronous filling system for multiple LNG tanks 11, which includes multiple LNG tanks 11 (fig. 1 is a top view), and aims to realize synchronous filling of multiple LNG tanks 11.

As shown in fig. 1 and 2, the storage module 12 of the LNG tank 11 includes a platform 1 disposed on a plane, the LNG tank 11 is disposed opposite to the platform 1, and a plurality of LNG tanks 11 are disposed in parallel in the width direction of the LNG tank 11 (in fig. 2, the LNG tanks 11 disposed in parallel are hidden for clarity); in the height direction, the LNG tank 11 is stacked with two layers; the LNG storage tanks may also be provided with multiple sets in the length direction of the platform 1.

As shown in fig. 2, the system includes a main pipe 2 for delivering LNG and returning gas, and an automatic docking device 3 for automatically docking the main pipe 2 with the LNG tanks 11 in the storage module 12; when the LNG tank 11 in the storage module 12 is stacked with multiple layers, the system further comprises a lifting module 5 for lifting the automatic docking device 3 and filling the LNG tank 11 stacked on the upper layer.

As shown in fig. 3, the LNG tank 11 includes a frame structure 14 disposed outside and a tank body 13 disposed inside, the tank body 13 being fixed by the frame structure 14; a receiving end 15 is provided at one end of the LNG tank 11 in the longitudinal direction, and as shown in fig. 4, the receiving end 15 includes a first fixing plate 16 fixed to the frame structure 14; the first retaining plate 16 comprises two female filling joints 17: a mother filling joint 17 is connected with the tank body 13 through two pipelines, and the two pipelines respectively have the effects of normally filling LNG and pre-filling LNG (namely precooling is carried out before the tank body 13 is filled); the other mother filling joint 17 is connected with the tank body 13 through a pipeline, and plays a role in discharging gas in the tank body 13 when LNG is filled; each pipeline is provided with an electromagnetic control valve 18 for controlling the opening and closing of the pipeline.

As shown in fig. 5, the automatic docking device 3 includes a floating plate 31, a male filling joint 32 is provided on the floating plate 31, and the male filling joint 32 can be inserted into and communicated with a female filling joint 17 (in fig. 4) on the first fixing plate 16; the two male filling joints 32 are respectively communicated with a foldable filling pipe 33 and a foldable return air pipe 34, and the filling pipe 33 and the return air pipe 34 are respectively communicated with the main pipe 2 in fig. 2.

As shown in fig. 6, a cylinder fixing block 35 and a third fixing plate 36 are sequentially disposed behind the floating plate 31, and the floating plate 31 is connected to the cylinder fixing block 35. A first oil cylinder 37 is fixed on the third fixing plate 36, and after a piston rod of the first oil cylinder 37 penetrates through the third fixing plate 36, the oil cylinder fixing block 35 and the floating plate 31 are pushed to move towards the first fixing plate 16, so that the female filling joint 17 is communicated with the male filling joint 32.

As shown in fig. 5, an aviation connector 38 and an aviation socket 39 are correspondingly disposed on the floating plate 31 and the first fixed plate 16, and when the first cylinder 37 pushes the floating plate 31 to move toward the first fixed plate 16, the aviation connector 38 is abutted against the aviation socket 39, thereby controlling the electromagnetic control valve 18.

As shown in fig. 8, four guide posts 4 are disposed between the third fixing plate 36 and the cylinder fixing block 35, one end of each guide post 4 is fixed to the cylinder fixing block 35, and the guide posts 4 penetrate through the third fixing plate 36, so that when the first cylinder 37 pushes the floating plate 31 to move, the guide posts 4 are engaged with the third fixing plate 36 to perform a guiding function.

As shown in fig. 5, the male refueling adapter 32 is abutted against the female refueling adapter 17 while the first cylinder 37 pushes the floating plate 31 to move toward and away from the first fixed plate 16. In order to reduce the wear caused by insufficient concentricity when the male filling joint 32 is butted with the female filling joint 17. As shown in fig. 6, a floating centering mechanism 41 is provided between the floating plate 31 and the cylinder fixing block 35.

The floating centering mechanism 41 has the following structure:

as shown in fig. 6, the floating centering mechanism 41 includes a through hole 42 penetrating through the floating plate 31, a fixing portion 43 is disposed in the through hole 42, the fixing portion 43 penetrates through the through hole 42, both ends of the fixing portion 43 in the length direction extend along the radial direction of the through hole 42, both ends of the fixing portion 43 in the length direction protrude out of the through hole 42 in the radial direction, and play a role of clamping the floating plate 31 and the cylinder fixing block 35, and the fixing portion 43 limits the movement of the floating plate 31 and the cylinder fixing block 35 in the horizontal direction; the fixing portion 43 is connected to a piston rod of the first cylinder 37 so as to transmit the pushing and pulling forces to the floating plate 31 and the cylinder fixing block 35.

As shown in fig. 8, in the height direction, elastic members 44 are disposed at four corners of the inner side of the floating plate 31, the elastic members 44 are springs, one end of each spring is connected to the floating plate 31 through a first rotating block 45, and the other end of each spring is connected to the cylinder fixing block 35 through a second rotating block 46. Further, when the floating plate 31 and the cylinder fixing block 35 are subjected to a force in the height direction (the force due to insufficient concentricity when the male charging joint 32 is butted against the female charging joint 17), the elastic member 44 is stretched or compressed, so that the male charging joint 32 and the female charging joint 17 are aligned in the height direction.

As shown in fig. 5, in order to ensure that the first fixed plate 16 and the floating plate 31 are in a locked state when they are butted, a guide lock mechanism 6 is provided between the floating plate 31 and the first fixed plate 16.

As shown in fig. 5, the guide locking mechanism 6 includes a locking rod 61 provided on the floating plate 31 and a locking sleeve 62 provided on the first fixing plate 16, and when the first cylinder 37 pushes the floating plate 31 to move toward the first fixing plate 16, the locking rod 61 moves into the locking sleeve 62 to perform a guiding and positioning function; as shown in fig. 6, a sliding cavity 63 is arranged in the locking rod 61, a second oil cylinder 64 is arranged on the back surface of the locking rod 61 of the floating plate 31, a piston rod of the second oil cylinder 64 is connected with a sliding piece 65, and the sliding piece 65 is connected in the sliding cavity 63 in a sliding manner; as shown in fig. 7, the end of the locking rod 61 is provided with a ring of locking channels 66, the locking channels 66 are communicated with the sliding cavity 63, and locking balls 67 are connected in the locking channels 66 in a rolling manner; the end portion of the slide member 65 is provided with a slope 68, and when the slide member 65 is moved toward the locking ball 67 by the second cylinder 64, the locking ball 67 is pushed out of a portion of the locking passage 66 by the slope 68 of the slide member 65 (i.e., the locking ball 67 protrudes from the outer surface of the locking stem), and then the locking ball 67 is inserted into the locking groove 69 of the locking sleeve 62, preventing the locking lever 61 from being disengaged from the locking sleeve 62.

As shown in fig. 5, the foldable filling pipe 33 and the foldable return gas pipe 34 are both made of a pipe dedicated for transporting low-temperature LNG liquid; because the filling pipe 33 and the return air pipe 34 are formed by connecting a plurality of pipelines, the folding of the filling pipe 33 and the return air pipe 34 is realized by arranging the rotary joint 21 between the adjacent pipelines, the rotary joint 21 not only realizes the rotation between the pipelines, but also realizes the communication between the adjacent pipelines by the rotary joint 21. When the second oil cylinder 64 pushes the floating plate 31 to move towards the first fixed plate 16, the filling pipe 33 and the return air pipe 34 in a folded state can be extended, and the LNG tank 11 is filled; when the floating plate 31 is retracted by the second cylinder 64, the fill pipe 33 and the return air pipe 34 are folded.

As shown in fig. 10, the main pipe 2 is functionally classified to include at least five, which are a low-pressure LNG pipe 22, a nitrogen gas pipe 23, an instrument air pipe 24, a return air pipe 34, and a torch pipe 26. The nitrogen pipe 23 functions to displace the LNG in the header pipe 2 and the LNG tank 11; a flare is connected behind the flare tube 26 to play a role in burning residual LNG in the main pipe 2 (LNG can be directly discharged outwards on the sea surface); the low-pressure LNG pipe 22 is connected to the filling pipe 33 and plays a role of filling the LNG tank 11 with LNG, and the other end of the low-pressure LNG pipe 22 is a liquid inlet end, i.e., a position where low-pressure LNG is supplied; the return gas pipe 34 is communicated with a return gas end, namely a pipeline opening for discharging gas, and the gas in the LNG tank 11 is discharged in the filling process; the instrument air tube 24 injects gas through a pneumatically controlled valve.

As shown in fig. 9, in order to perform the elevating function of the elevating module 5, the header pipe 2 is divided into a second pipe 52 provided on the elevating platform 54 and first pipes 51 provided on both sides of the elevating platform 54, and the first pipes 51 and the second pipes 52 are communicated by a connection pipe 53; the first and

second conduits

51 and 52 each comprise the low pressure LNG pipe 22, nitrogen gas pipe 23, instrument air pipe 24, return air pipe 34, and flare tip pipe 26 of fig. 10. Namely, the filler pipe 33 and the return air pipe 34 of the automatic docking apparatus 3 communicate with the inside of the second pipe 52.

As shown in fig. 10, the number of the connection pipes 53 is four in embodiment 1, the connection pipe 53 at the head end communicates with one pipe in the first pipe 51, the connection pipe 53 at the tail end communicates with a corresponding pipe in the second pipe 52, and the adjacent connection pipes 53 are rotatably connected and communicate with each other by the rotary joint 21. When the elevating platform 54 is raised, the plurality of connection pipes 53 are extended, and when the elevating platform 54 is lowered, the plurality of connection pipes 53 are folded with each other.

As shown in fig. 9, the lifting platform 54 is lifted by the third oil cylinder 55, in embodiment 1, three third oil cylinders 55 are provided, the bottom of the third oil cylinder 55 can be arranged below the platform 1 or above the platform 1, and the piston rod of the third oil cylinder 55 is connected with the bottom of the lifting platform 54; the automatic docking device 3 is disposed on one side or opposite sides of the lifting platform 54, and a plurality of automatic docking devices 3 are distributed along the length direction of the second pipeline 52 to fill the LNG tank 11 on one side or the LNG tank 11 on both sides.

The working process of the embodiment 1 is as follows: the lifting platform 54 is raised or lowered to the platform 1 position until the male filling joint 32 is aligned with the female filling joint 17, and the connecting pipe 53 is folded during the lifting process; then the first oil cylinder 37 pushes the floating plate 31 towards the first fixing plate 16, during the pushing process, the male filling joint 32 is in butt communication with the female filling joint 17, the locking rod 61 enters the locking sleeve 62, then the second oil cylinder 64 pushes the sliding piece 65 to move, so that the locking bead 67 is embedded into the locking groove 69, and the floating plate 31 is prevented from being separated from the first fixing plate 16; in the process of butting the male filling joint 32 and the female filling joint 17, under the action of the elastic piece 44, the floating plate 31 and the oil cylinder fixing block 35 move in the height direction, so that the male filling joint 32 and the female filling joint 17 are prevented from being impacted; after the electromagnetic control valve 18 is opened and the LNG tank 11 is precooled, the filler pipe 33 injects low-pressure LNG into the LNG tank 11, and the return gas pipe 34 simultaneously discharges the gas in the LNG tank 11. After the LNG tank 11 in the same horizontal plane is filled, the solenoid valve closes the LNG tank, the filler pipe 33, and the return air pipe 34, and the second oil cylinder 64 and the first oil cylinder 37 are successively retracted. The lift platform 54 then moves upward, repeating the above steps, and filling of multiple LNG tanks 11 is achieved.

Example 2: as shown in fig. 11, an LNG tank carrier includes a deck 7, a multi-LNG tank simultaneous filling system of embodiment 1 is disposed on the deck 7, an LNG storage module 12 is disposed on the deck 7, a main body of a third cylinder 55 may be disposed below the deck 7, and a piston rod of the third cylinder 55 may be connected to a lifting platform 54 of fig. 10 disposed on the deck 7 through the deck 7.

The working principle of embodiment 2 is the same as that of embodiment 1, and the LNG receiving station or the liquefaction plant terminal infuses low-pressure LNG to the header pipe 2 through the loading arm, thereby realizing the synchronous filling of the plurality of LNG tank cases 11 on the LNG tank carrier ship.

Example 3: as shown in fig. 12, fig. 11 is a schematic cross-sectional view of the female filling joint 17, a vacuum thermal insulation cavity 74 is arranged in the inner wall of the female filling joint 17, and the vacuum thermal insulation cavity 74 is arranged around the female filling joint 17, low-pressure LNG at a temperature of-100 ℃ in the male filling joint 32 is provided through the vacuum thermal insulation cavity 74, so that the outer surface of the male filling joint 32 is not frozen in the filling process, the male filling joint 32 can be better inserted into the female filling joint 17, and the problem of abrasion is reduced.

A one-way valve is arranged in the female filling joint 17, when the male filling joint 32 is inserted into the female filling joint 17, the male filling joint 32 pushes the valve core 71 to move backwards, and low-pressure LNG in the male filling joint 32 flows into the female filling joint 17 through the filtering hole 73, so that the LNG tank is filled; meanwhile, when the male filling joint 32 leaves the female filling joint, the spring 72 drives the valve plug 71 to move and blocks the female filling joint 17.

Claims

1. A multi-LNG tank synchronous filling system comprises a header pipe (2), branch pipes and LNG tanks (11), wherein the header pipe (2) is communicated with a liquid inlet end and a gas return end, the header pipe (2) is communicated with one ends of the branch pipes, the other end of each branch pipe is a filling end, each filling end corresponds to one LNG tank (11) in the same plane, a receiving end (15) is arranged on each LNG tank (11), and an automatic butt joint device (3) is arranged between each filling end and the receiving end (15);

the branch pipe comprises a foldable filling pipe (33) and a foldable return air pipe (34); the automatic butt joint device (3) comprises a moving mechanism, and the moving mechanism drives the filling pipe (33) and the return air pipe (34) to extend in the space and is in free butt joint communication with the filling end; the automatic butt joint device (3) further comprises a first fixing plate (16) and a second fixing plate (19), the receiving end (15) comprises a female filling joint (17) arranged on the first fixing plate (16), the female filling joint (17) is communicated with the LNG tank (11), a male filling joint (32) corresponding to the female filling joint (17) is arranged on the second fixing plate (19), the male filling joint (32) is respectively communicated with a filling pipe (33) and a return air pipe (34), and the moving mechanism drives the male filling joint (32) to be communicated with and disconnected from the female filling joint (17) through linear reciprocating motion;

the automatic butt joint device (3) further comprises a guide mechanism arranged on the second fixing plate (19), and a guide locking mechanism (6) is arranged between the first fixing plate (16) and the second fixing plate (19);

the guide mechanism comprises a third fixing plate (36) and a guide post (4), the moving mechanism comprises a first oil cylinder (37) fixed with the third fixing plate (36), a piston rod of the first oil cylinder (37) penetrates through the third fixing plate (36) and is connected with the second fixing plate (19), and one end of the guide post (4) is connected to the second fixing plate (19) and penetrates through the third fixing plate (36);

the second fixing plate (19) comprises a floating plate (31) and an oil cylinder fixing block (35), the male injection joint (32) is arranged on the floating plate (31), the guide pillar (4) is arranged on the oil cylinder fixing block (35), and a floating centering mechanism (41) is arranged between the floating plate (31) and the oil cylinder fixing block (35);

the floating centering mechanism (41) comprises a through hole (42), a fixing part (43) and an elastic piece (44); the through hole (42) penetrates through the floating plate (31) and the oil cylinder fixing block (35) to be arranged, the fixing part (43) penetrates through the through hole (42) to be arranged, two ends of the fixing part (43) in the length direction are larger than the aperture of the through hole (42), one end of the fixing part (43) in the length direction is respectively connected with the piston rod of the first oil cylinder (37) and the oil cylinder fixing block (35), the other end of the fixing part (43) in the length direction is abutted against the floating plate (31), and therefore the floating plate (31) and the oil cylinder fixing block (35) are limited to move in the horizontal direction; one end of the elastic piece (44) is connected with the floating plate (31), and the other end of the elastic piece (44) is connected with the oil cylinder fixing block (35); the elastic piece (44) enables the floating plate (31) and the oil cylinder fixing block (35) to move in the height direction after the floating plate (31) is subjected to acting force in the height direction;

be provided with elevating system on house steward (2), elevating system includes lift platform (54) and third hydro-cylinder (55) that promote lift platform (54) to go up and down, house steward (2) is including setting up first pipeline (51) in lift platform (54) both sides, house steward (2) are still including setting up second pipeline (52) on lift platform (54), it has many connecting pipes (53) of connecting through rotary joint (21) to communicate between first pipeline (51) and second pipeline (52).

2. The multiple LNG tank synchronized filling system of claim 1, wherein: the guide locking mechanism (6) comprises a second oil cylinder (64), a locking rod (61) arranged on the second fixing plate (19) and a locking sleeve (62) arranged on the second fixing plate, the locking rod (61) is matched with the locking sleeve (62), a sliding cavity (63) is arranged in the locking rod (61), a sliding piece (65) is connected in the sliding cavity (63) in a sliding mode, a locking channel (66) extends in the sliding cavity (63) along the radial direction, a locking bead (67) is connected in the locking channel (66) in a rolling mode, a locking groove (69) matched with the locking bead (67) is arranged on the inner surface of the locking sleeve (62), an inclined surface (68) abutted against the locking bead (67) is arranged at one end of the sliding piece (65), and the other end of the sliding piece (65) is connected with the second oil cylinder (64); the second oil cylinder (64) pushes the sliding piece (65) to slide, and then the inclined surface (68) pushes the locking ball (67) to protrude out of the outer surface of the locking rod (61) and enables the locking ball (67) to be embedded into the locking groove (69).

3. The utility model provides a LNG tank transport ship which characterized in that: comprising the multiple LNG tank synchronized filling system of any of claims 1-2.