CN103693168A - Water transportation system for marine LNG (Liquefied Natural Gas) storage tank - Google Patents
Water transportation system for marine LNG (Liquefied Natural Gas) storage tank Download PDFInfo
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- CN103693168A CN103693168A CN201310705895.4A CN201310705895A CN103693168A CN 103693168 A CN103693168 A CN 103693168A CN 201310705895 A CN201310705895 A CN 201310705895A CN 103693168 A CN103693168 A CN 103693168A
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Abstract
The invention discloses a water transportation system for a marine LNG (Liquefied Natural Gas) storage tank. The water transportation system comprises an LNG storage module, a power traction device and at least four cables, wherein the LNG storage module comprises a box cylindrical foundation and a caisson structure arranged on the box cylindrical foundation; the box cylindrical foundation is of a cavity structure which is formed by encircling a top plate and a skirting board and has an open end; the cavity structure is internally provided with multiple open cabins; the skirting board is provided with multiple air valves communicated with the open cabins; the caisson structure comprises a caisson bottom plate, caisson sidewalls and a caisson top plate; the caisson bottom plate, the caisson sidewalls and the caisson top plate are connected to form a cavity; the cavity is used for bearing the LNG storage tank; the caisson bottom plate is arranged on the top plate; the two ends of each cable are respectively connected to the LND storage module and the power traction device. The water transportation system for the marine LNG storage tank, on one hand, can reduced the gravity center of a floating transportation part per se, and on the other hand, can reduce a functional area of a horizontal load and can well avoid the risk of structure instability.
Description
Technical field
The present invention relates to a kind of water transportation system of marine LNG storage tank, belong to liquefied natural gas (LNG) transmission & distribution technology field.
Background technology
The land receiving terminal of LNG faces problems such as can utilizing water front minimizing, land-based area shortage, environmental requirement height, and the engineering construction of development LNG receiving terminal waterborne is the important channel addressing these problems.LNG receiving terminal waterborne, according to the difference of structural shape, can be divided into floating and the large class of fixed type two.Current LNG receiving terminal waterborne, mostly is floating, and it utilizes, on LNG carrier, gasification facility is installed, and then by marineline, debarks.Fixed receiving terminal, also only have at present ExxonMobil company to complete the marine fixed reception terminal engineering GBS (Gravity Based Structures) of a LNG both at home and abroad, Ing.Paul V Sullivan, Paul Maynard contrasts GBS receiving terminal and marine receiver module and land receiving terminal, from the aspects such as stressed, basic pattern, construction period, cost and technical risk of structure, analyzes; Roger D.Leick introduces the marine receiving terminal of the LNG of GBS pattern, comprises HSE, mooring mooring system, unloading arm, memory module, plumbing system etc.; Erwin Loots, Bas Buchner is studied wave motion, and the method based on model test and numerical modelling has obtained the impact of wave action on GBS; Bas Buchner etc. analyze the GBS impact that in shallow water territory, fluid effect causes, and adopt the method convection cell effect of model test to simulate.Generally, also less about fixed receiving terminal achievement in research and through engineering approaches example, studying in great detail the transport systems field of LNG module not.
Because of engineering construction and function needs, LNG memory system scale is generally all larger, as LNG storage tank, box culvert etc., belongs to large-scale component, and lower water, towage and installation that corresponding memory system builds have formed transport systems.Large-scale component is general first prefabricated on land, then carries out water transportation and installation.The most frequently used is barging system, comprise member, barge, loop wheel machine and relevant device etc., first prefabricated member is risen and winch to the barge matching, reach behind appointed place, with hanging ship, lift, what GBS receiving terminal adopted is exactly this type of transport systems again; Another is from transportation by driving communication system, comprise member, tugboat and relevant device, also system is utilized the buoyancy that structure self is subject to, first complete floatingly, then under the dragging of tugboat, arrive appointed place, finally by water filling, complete sinking, this transport systems must be application in fields such as bridge, marine power generations, but in LNG association area, also there is no the report relevant to this type of transport systems.
Consider the particularity of LNG module, adopt the shortcoming of barging system to be:
(1) for large-scale component, especially there is the member of certain altitude, the stability of barging is difficult to ensure card;
(2) while lifting, the stressed mode producing of LNG memory system changes, and easily makes structure generation distortion or damage, may bring adverse effect to the installation of memory system and long-term safety operation;
(3) hang the lifting of ship and barge and cost of transportation high.
Summary of the invention
The water transportation system that the object of this invention is to provide a kind of marine LNG storage tank, to overcome barging system stability, to lift the problem that causes the aspects such as memory system deformation damage and cost of transportation.
The water transportation system of a kind of marine LNG storage tank provided by the present invention, comprises LNG memory module, dynamic traction device and at least 4 hawsers;
Described LNG memory module comprises case cylinder basis and is arranged at the caisset on described case cylinder basis;
The cavity structure that described case cylinder basis is the end opening that surrounded by top board and skirtboard; In described cavity structure, be provided with several opening cabins; Described skirtboard is provided with several air valves, and described air valve is connected with described opening cabin;
Described caisset comprises Bottom plate of sinkbox, caisson sidewall and caisson top board, and described Bottom plate of sinkbox, described caisson sidewall and described caisson top board are connected and form a cavity, and described cavity is used for carrying described LNG storage tank;
Described Bottom plate of sinkbox is located on described top board;
The two ends of described hawser are connected with described dynamic traction device with described LNG memory module respectively.
In above-mentioned water transportation system, described opening cabin can be and is evenly arranged.
In above-mentioned water transportation system, in the cavity of described caisset, be provided with several inner supports, to guarantee the stability of LNG storage tank;
Described inner support can be cross-tie, vertical supporting and/or diagonal brace.
In above-mentioned water transportation system, described caisson sidewall can be double-decker, in described double-deck cavity, is provided with warm material.
In above-mentioned water transportation system, the top of described caisset is provided with several support beams, and described caisson top board is located on described support beam.
In above-mentioned water transportation system, described top board and described Bottom plate of sinkbox can be formed in one.
In above-mentioned water transportation system, described dynamic traction device can be tugboat.
In above-mentioned water transportation system, described hawser can be steel cable;
Described dynamic traction device is provided with winch, can by described winch, control the length of described steel cable, can control direction and the angle of LNG memory module; Constantly note every steel cable stressing conditions, guarantee that each cable stress and calculating match, avoid hawser to occur situation about not stressing; While being necessary, can increase a tugboat, assist to control.
While using water transportation system of the present invention to carry out the transportation of LNG storage tank, step is as follows:
(1) the each several part manufacture of this water transportation system (or lease) completes and is in place;
(2) detect navigation channel, guarantee that navigation channel meets the requirement of transportation by driving part (LNG memory module) in this system;
(3) dock discharges water, and transportation by driving part (LNG memory module) suffered buoyancy is greater than deadweight, module floating;
(4) transportation by driving part (LNG memory module) opening cabin water level situation of calculating according to theory, in conjunction with actual monitoring result, adjusts cabin internal gas pressure in time, makes floating module reach dynamical equilibrium;
(5) dynamic traction device (tugboat) drags transportation by driving part (LNG memory module) and enters navigation channel, strictly controls tugboat speed, in order to avoid cause module system to destroy; By winch, regulate the length of steel cable, direction and angle that can control module transportation by driving;
(6) if necessary, increase a tugboat control module direction and angle;
(7) water transportation system draws to assigned address, by the outside exhaust in opening cabin of transportation by driving part (LNG memory module), transportation by driving part (LNG memory module) is sunk.
The water transportation system of the marine LNG storage tank of the present invention has following beneficial effect:
(1) large-scale component itself has suitable weight, if use barging, the center of gravity of whole system is higher, when being subject to horizontal force action (as wind loading, wave load etc.), and easy unstability; For the LNG module the present invention relates to, structure is originally as shell unit structure, and the beam conventional with offshore platform, bar and truss structure are compared, and area of thrust surface are larger, and the stability while being subject to horizontal force action is more difficult to ensure card; This can reduce the center of gravity of transportation by driving part itself on the one hand from transportation by driving communication system, can reduce on the other hand the active area of horizontal loading, the risk that can well evade structural instability.
(2) the transportation by driving part in the present invention, it is LNG memory module, topside outer wall is concrete structure, in order to guarantee normal mounting and the long-term safety operation of structure, generally do not consider to bear the effect of total cross-section tension, if adopt barging, while being transported to assigned address lifting, the stress system of structure changes, and can cause outer walls of concrete structure total cross-section tension under member dead weight effect, has increased the risk of structure crack; If adopt defeatedly from transportation by driving, can there is not large variation in whole stress system, and the stress point position in tugboat transportation can, by strengthening local structure rigidity, ensure the safety of structure stress.
(3) dynamic traction device in the present invention, adopts tugboat to meet the demands, flexible.
(4) the present invention does not comprise hanging device from transportation by driving communication system, does not comprise barge yet, greatly reduces traditional barging and lifting cost and uses.
Accompanying drawing explanation
Fig. 1 is the structural representation of the water transportation system of the marine LNG storage tank of the present invention.
Fig. 2 is the structural representation (end face) of LNG memory module of the water transportation system of the marine LNG storage tank of the present invention.
Fig. 3 is the structural representation (bottom surface) of LNG memory module of the water transportation system of the marine LNG storage tank of the present invention.
Fig. 4 is the section-drawing of LNG memory module of the water transportation system of the marine LNG storage tank of the present invention.
Fig. 5 is the water transportation system towage of the marine LNG storage tank of the present invention and installs rear LNG memory module change of level schematic diagram.
In figure, each mark is as follows:
1LNG memory module, 2 tugboats, 3 steel cables, 4 top boards, 5 skirtboards, 6 opening cabins, 7 Bottom plate of sinkbox 7,8 caisson sidewalls, 9 caisson top boards, 10LNG storage tank, 11 inner supports, 12 support beams.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but the present invention is not limited to following examples.
As shown in Figure 1, the water transportation system of marine LNG storage tank provided by the present invention comprises LNG memory module 1, tugboat 2 and 6 steel cables 3; As shown in Fig. 2-Fig. 4, the LNG memory module 1 in the present invention comprises case cylinder basis and is arranged at the caisset on this case cylinder basis; The cavity structure that this case cylinder basis is the end opening that surrounded by top board 4 and skirtboard 5, top board 4 is made by ferro-concrete, and skirtboard 5 is made by steel plate.In this cavity structure, be provided with a plurality of opening cabins 6 that are evenly arranged, and on skirtboard 5, be provided with a plurality of air valve (not shown), air valve is connected with opening cabin 6, to the interior inflation in opening cabin 6 or venting.This caisset comprises Bottom plate of sinkbox 7, caisson sidewall 8 and caisson top board 9, and wherein Bottom plate of sinkbox 7, caisson sidewall 8 and caisson top board 9 are connected and form a cavity, and this cavity is used for carrying LNG storage tank 10.Caisson sidewall 8 is wherein double-decker, in double-deck cavity, is provided with warm material.In the cavity of caisset, be provided with a plurality of inner supports 11, these inner supports 11 are the combination of cross-tie, vertical supporting and diagonal brace, to guarantee the stability of LNG storage tank 10.Caisson top board 9 is located on top board 4.In the present invention, the two ends of steel cable 3 are connected with tugboat 2 with LNG memory module 1 respectively, think that LNG memory module 1 provides power.
Water transportation system of the present invention, in order to strengthen the fastness of caisson, is provided with a plurality of support beams 12 at the top of caisset, caisson top board 9 is located on support beam 12, and support beam 12 can adopt I-beam section to make.
Water transportation system of the present invention, builds in order to reduce costs and to be easy to, and top board 4 and Bottom plate of sinkbox 7 can be able to be formed in one.
The use procedure of the water transportation system of the marine LNG storage tank of the present invention is as follows:
(1) LNG memory module 1 is prefabricated complete after, dock discharges water, in this process, the result of calculating according to theory, the water level in each opening cabin 6, basis during tight monitoring modular floating, monitors each cabin air pressure; By exhaust or inflation, adjust cabin and press, and then reach the object of controlling water level in each cabin.
(2) tugboat 2 is connected by relevant device with LNG memory module 1, can be transportation by driving tractive force is partly provided, thereby reach the object of transportation, but transportation by driving part is in prefabricated and transportation, changed by force mode, the structural distortion that tightly monitoring causes thus, if desired, can be to water filling in storage tank, the excessive protuberance of module bottom causing to resist buoyancy.
(3) in transportation, for strengthening the floating balance of transportation by driving part, can increase the air pressure in each opening cabin 6, outside, reduce water level in cabin, increase cabin, outside body buoyancy.Adopt the method for a plurality of separations, can strengthen basic intensity and resistance to overturning, reduce the distortion of basis and storage tank, be also conducive to keep the stability after module floating.
(4), in transportation, by winch, regulate the length of steel cable, direction and angle that can control module transportation by driving; Constantly note every steel cable stressing conditions, guarantee that each cable stress and calculating match, avoid hawser to occur situation about not stressing; While being necessary, can increase a tugboat, assist to control.
(5) arrive after assigned address, by the outside exhaust in opening cabin 6, LNG memory module 1 is sunk, in this process, strictly control rate of sinking, module is evenly sunk, in order to avoid cause excessive inclination.
The water transportation system towage of the marine LNG storage tank of the present invention and install rear LNG memory module change of level schematic diagram as shown in Figure 5.
Claims (8)
1. a water transportation system for marine LNG storage tank, is characterized in that: described water transportation system comprises LNG memory module, dynamic traction device and at least 4 hawsers;
Described LNG memory module comprises case cylinder basis and is arranged at the caisset on described case cylinder basis;
The cavity structure that described case cylinder basis is the end opening that surrounded by top board and skirtboard; In described cavity structure, be provided with several opening cabins; Described skirtboard is provided with several air valves, and described air valve is connected with described opening cabin;
Described caisset comprises Bottom plate of sinkbox, caisson sidewall and caisson top board, and described Bottom plate of sinkbox, described caisson sidewall and described caisson top board are connected and form a cavity, and described cavity is used for carrying described LNG storage tank;
Described Bottom plate of sinkbox is located on described top board;
The two ends of described hawser are connected with described dynamic traction device with described LNG memory module respectively.
2. water transportation system according to claim 1, is characterized in that: described opening cabin is for being evenly arranged.
3. water transportation system according to claim 1 and 2, is characterized in that: in the cavity of described caisset, be provided with several inner supports;
Described inner support is cross-tie, vertical supporting and/or diagonal brace.
4. according to the water transportation system described in any one in claim 1-3, it is characterized in that: described caisson sidewall is double-decker, in described double-deck cavity, be provided with warm material.
5. according to the water transportation system described in any one in claim 1-4, it is characterized in that: the top of described caisset is provided with several support beams, described caisson top board is located on described support beam.
6. according to the water transportation system described in any one in claim 1-5, it is characterized in that: described top board and described Bottom plate of sinkbox are formed in one.
7. according to the water transportation system described in any one in claim 1-6, it is characterized in that: described dynamic traction device is tugboat.
8. according to the water transportation system described in any one in claim 1-7, it is characterized in that: described hawser is steel cable;
Described dynamic traction device is provided with winch, controls the length of described steel cable by described winch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310705895.4A CN103693168B (en) | 2013-12-19 | 2013-12-19 | The water transportation system of marine LNG storage tank |
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| CN201310705895.4A CN103693168B (en) | 2013-12-19 | 2013-12-19 | The water transportation system of marine LNG storage tank |
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| CN103693168B CN103693168B (en) | 2016-07-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164885A (en) * | 2014-08-06 | 2014-11-26 | 中国海洋石油总公司 | Caisson towing method |
| CN104452790A (en) * | 2014-10-13 | 2015-03-25 | 天津大学前沿技术研究院有限公司 | Caisson with apron boards and adjusting method for caisson during air floatation towing |
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| CN203240270U (en) * | 2013-03-15 | 2013-10-16 | 中国海洋石油总公司 | Near-shore type low-temperature LNG (Liquefied Natural Gas) transmission system |
| JP5339522B2 (en) * | 2009-05-12 | 2013-11-13 | ジャパンマリンユナイテッド株式会社 | Liquefied gas storage system |
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| CN1406813A (en) * | 2001-08-24 | 2003-04-02 | 克莱奥斯塔－法国有限公司 | Natural gas supply devices |
| CN1930058A (en) * | 2004-03-10 | 2007-03-14 | 阿克芬亚兹股份有限公司 | A method of planning and manufacturing an LNG storage tank and an aluminium LNG storage tank manufactured using the method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164885A (en) * | 2014-08-06 | 2014-11-26 | 中国海洋石油总公司 | Caisson towing method |
| CN104452790A (en) * | 2014-10-13 | 2015-03-25 | 天津大学前沿技术研究院有限公司 | Caisson with apron boards and adjusting method for caisson during air floatation towing |
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| CN103693168B (en) | 2016-07-13 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC Gas & Power Group Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: CNOOC Gas & Power Group Patentee before: China National Offshore Oil Corporation |