CN102958797B

CN102958797B - Liquefied gas carrier

Info

Publication number: CN102958797B
Application number: CN201180030654.3A
Authority: CN
Inventors: 平松彩; 津村健司; 塚本泰史
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: MITSUBISHI Shipbuilding Corporation
Priority date: 2010-09-08
Filing date: 2011-08-31
Publication date: 2015-11-25
Anticipated expiration: 2031-08-31
Also published as: WO2012032983A1; CN102958797A; KR20130004596A; KR101606306B1; KR20140099918A; JP2012056429A

Abstract

A kind of liquefied gas carrier, can reduce the compression area of hull entirety, can reduce wind pressure resistance, and can reduce the center-of-gravity position of boats and ships, improves the stability of hull.Liquefied gas carrier (1) possesses: multiple partially flat spheroid (2), the gas of its internal storage liquefaction, and along the configuration of ship cephalocaudal direction, and be fixed on hull (5) via skirt (3); A continuous print jar (7), it covers the first half of these partially flat spheroids (2), and extend along ship cephalocaudal direction and beam direction, described jar (7) has relative to described hull (5) rigid joint, forms with described hull (5) structure integrally guaranteeing longitudinal strength.

Description

Liquefied gas carrier

Technical field

The present invention relates to liquefied gas carrier, particularly relate to and store and transport in container with the LNG ship of the natural fuels of low-temperature liquefaction (LNG).

Background technology

As storing and transporting in container with the liquefied gas carrier of the natural fuels of low-temperature liquefaction (LNG), there will be a known liquefied gas carrier, it is covered the first half (with reference to patent documentation 1) of multiple (very) spheroid configured along ship cephalocaudal direction by a continuous print jar.

Prior art document

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Application Publication 2005-521589 publication

But in (very) spheroid, the body section due to LNG ship is formed substantially rectangular, so container contents is amassed little relative to the ratio of the volume of zoning in ship spheroid being supported lift-launch on one side by skirt, Volumetric efficiency is poor.Therefore, container can not be carried out completely to the accommodation in hull, cause the maximization of hull.In addition, because container and jar highland on deck is outstanding, so the appearance poor of observing from bridge, need highly high superstructure thereupon.Therefore, the compression area that there is hull entirety increases, and wind pressure resistance increases, and the center-of-gravity position of boats and ships improves, the problem points that stability worsens.

Summary of the invention

The present invention foundes in view of the foregoing, its object is to, and provides a kind of liquefied gas carrier, can reduce the compression area of hull entirety, can reduce wind pressure resistance, and can reduce the center-of-gravity position of boats and ships, can improve the stability of hull.

The present invention, for solving above-mentioned problem, adopts following technical scheme.

The invention provides a kind of liquefied gas carrier, it possesses: multiple flat spheroid, the gas of its internal storage liquefaction, and along the configuration of ship cephalocaudal direction, and be fixed on hull via skirt, a continuous print jar, it covers the first half of these flat spheroids, and extend along ship cephalocaudal direction and beam direction, described jar has and engages relative to described hull rigidity, the structure integrally guaranteeing longitudinal strength is formed with described hull, wherein, the more top in described flat spheroid portion under the line possesses cylindrical portion and the top that is connected with in this cylindrical portion the top of convex runner plate structure, the more below in portion possesses the bottom being connected with the runner plate structure also convex in the below of described cylindrical portion downwards under the line, and flat spherical shorter than the diameter in equator of the diameter forming vertical direction.

According to liquefied gas carrier of the present invention, when compared with (very) spheroid with the radius identical with the radius of the horizontal section of ambitus, the volume more a large amount of than spheroid is guaranteed at sustained height, therefore, compared with spheroid, height can be reduced with same volume.

Thus, with adopt the situation of spheroid with same volume compared with, the height of the end face from hull bottom to jar of (2% ~ 25%) can be reduced, the compression area of hull entirety can be reduced, wind pressure resistance can be reduced, the center-of-gravity position of boats and ships can be reduced, the stability of hull can be improved.

In above-mentioned liquefied gas carrier, more preferably, the height of the end face from the hull bottom of this liquefied gas carrier to jar, compared with the height from the hull bottom of liquefied gas carrier to jar end face adopting spheroid with same volume, reduces by 2% ~ 25%.

According to this liquefied gas carrier, when comparing with (very) spheroid with the radius identical with the radius of the horizontal section of ambitus, the volume more a large amount of than spheroid is guaranteed at sustained height, therefore, compared with spheroid, can with the height of same volume reduction from the hull bottom of this liquefied gas carrier to jar end face.

In above-mentioned liquefied gas carrier, it is further preferred that the total volume in the container of described flat spheroid is 150,000 m ³above.

According to this liquefied gas carrier, when comparing with (very) spheroid with the radius identical with the radius of the horizontal section of ambitus, the volume larger than spheroid is guaranteed at sustained height, therefore, compared with spheroid, can at the situation decline low clearance of same volume.

In above-mentioned liquefied gas carrier, it is further preferred that set up for carrying out loading and unloading operation the gangway ladder passage being arranged at the harbour pulled in shore being provided with above the upper deck between the side and side plate of described jar.

According to this liquefied gas carrier, because the gangway ladder being arranged at harbour is set up in above passage, therefore, even if when upper deck is configured at low position, also can set up the gangway ladder being arranged at harbour, can make good relative to the suitability of the gangway ladder being arranged at harbour.

In the liquefied gas carrier being provided with described passage, it is further preferred that the height H (m) above from hull bottom to described passage to be set in the scope high and lower than 40 (m) than height D (m)+2 (m) above from described hull bottom to described upper deck and can to set up the height being arranged at all gangway ladders making a reservation for the harbour pulled in shore.

In addition, " predetermined harbour " the new harbour etc. that this ship of the predetermined harbour pulled in shore of this ship and/or maiden voyage after referring to maiden voyage pulls in shore because of air route change etc. pulled in shore.

According to this liquefied gas carrier, gangway ladder is set up above the passage that height (namely from the height above upper deck above passage) on from hull bottom to passage configures according to the movable range of the gangway ladder being arranged at the predetermined harbour pulled in shore, therefore, even if when upper deck is configured at low position, also can set up all gangway ladders being arranged at the predetermined harbour pulled in shore, can make good relative to the suitability of the gangway ladder being arranged at harbour.

Invention effect

According to liquefied gas carrier of the present invention, realize the compression area that can reduce hull entirety, can wind pressure resistance be reduced, the center-of-gravity position of boats and ships can be reduced, the effect that the stability of hull is such can be improved.

Accompanying drawing explanation

Fig. 1 is the figure of the liquefied gas carrier of an embodiment of the present invention, and (a) is right hand view, and (b) is planar view;

Fig. 2 is that the II-II of Fig. 1 (a) is to pseudosection;

Fig. 3 is the figure of the liquefied gas carrier of an embodiment of the present invention, (a) be the A-A of Fig. 1 (a) to pseudosection, (b) is that the B-B of Fig. 1 (b) is to pseudosection;

Fig. 4 is that the IV-IV of Fig. 1 (a) is to pseudosection;

Fig. 5 is the lateral plan of the flat spheroid shown in Fig. 1 ~ Fig. 3 (a).

Description of symbols

1 liquefied gas carrier

2 flat spheroids

3 skirt

5 hulls

6 upper deck

7 jars

7a side

7b end face

9 side plates

11 hull bottom

20 passages

31 cylindrical portion

32 tops

Bottom 33

Detailed description of the invention

Below, an embodiment of liquefied gas carrier of the present invention is described with reference to Fig. 1 ~ Fig. 5.

Fig. 1 is the figure of the liquefied gas carrier of present embodiment, a () is right hand view, b () is planar view, Fig. 2 is that the II-II of Fig. 1 (a) is to pseudosection, Fig. 3 is the figure of the liquefied gas carrier of present embodiment, a () is that the A-A of Fig. 1 (a) is to pseudosection, b () is that the B-B of Fig. 1 (b) is to pseudosection, Fig. 4 be the IV-IV of Fig. 1 (a) to pseudosection, Fig. 5 is the lateral plan of the flat spheroid shown in Fig. 1 ~ Fig. 3 (a).

As shown in Fig. 1 (a), Fig. 1 (b) and Fig. 3 (a), the liquefied gas carrier of present embodiment (being " LNG ship " in present embodiment) 1 be such as possess four aluminums flat spheroid (also referred to as " non-real spheroid ".) 2 boats and ships, the flat spheroid 2 of these aluminums is respectively can the mode of store liquefied gas (natural fuels for liquefying under low temperature in present embodiment) be formed therein.

As shown in Figure 5, flat spheroid 2 be the diameter of vertical direction shorter than the diameter in equator some flat spherical, be some flat and approximately square containers that is spherical, that formed in other words as the mode that few with the generation in useless space in the inner side of hull 5 and above hull 5 overhang is few.Above the ambitus of flat spheroid 2 (Northern Hemisphere) be provided with radius R, height H 2 cylindrical portion 31 and be connected with in the top of cylindrical portion 31 and be the top 32 becoming convex runner plate structure of height H 1, be provided with and be connected with in the below of cylindrical portion 31 it bottom 33 that be height H 3, that become convex runner plate structure downwards in the below (southern hemisphere) of the ambitus of flat spheroid 2.

Top 32 possesses anchor ring portion 34 and spherical shell portion 35.

Anchor ring portion 34 is connected with the top in cylindrical portion 31, such as, formed by a part for the spheroid of radius R 2 with the scope of θ 1=60 °.

Spherical shell portion 35 is connected with the top in anchor ring portion 34, is formed by a part for the spheroid of radius R 1.

In addition, R2 is α × R (radius (hereinafter referred to as " radius of ambitus ") of the horizontal section of ambitus), such as when set α as 0.5, R2 is 0.5 times of R (radius of ambitus).

In addition, R1 is β × R, β is (1-α+α × COS θ 1)/COS θ 1, such as, setting θ 1 as 60 °, if when α is 0.5, and 1.5 times of β to be 1.5, R1 be R.

On the other hand, bottom 33 possesses the first spherical shell portion 36, spherical shell portion 38 of anchor ring portion 37, second.

First spherical shell portion 36 is connected with the below in cylindrical portion 31, such as, formed with the part of the scope of θ 4=25 ° by the spheroid of radius R 4 (=R).

Anchor ring portion 37 is connected with the below in the first spherical shell portion 36, such as, formed by a part for the spheroid of radius R 5 with the scope of θ 5=38 °.

Second spherical shell portion 38 is connected with the below in anchor ring portion 37, is formed by a part for the spheroid of radius R 6.

In addition, R5 is γ × R, such as set γ as 0.7 when, R5 is 0.7 times of R.

In addition, R6 is δ × R, δ is (1-γ) × COS θ 4/COS (θ 4+ θ 5)+γ, such as, set θ 4 as 25 °, if θ 5 is 38 °, if when γ is 0.7, and 1.299 times of δ to be 1.299, R6 be R.

In addition, in the present embodiment, be set as roughly 1.5 (a/b ≒ 1.5) with the ratio (a/b) of the total longitudinal direction size b in the maximum dimension in cross-direction a in anchor ring portion 37 and anchor ring portion 37 and the second spherical shell portion 38, and be set as height H 1, H2 and H3 meets following formula (1) ~ formula (3).

R/H1=1.5 (formula 1)

2.5≤R/H2≤3.3 (formula 2)

1.1≤R/H3≤1.2 (formula 3)

At this, if be set as a/b ≒ 1.5, then by pressing in flat spheroid 2, the compressed capability that the part at small curve produces maintained very little, therefore, not needing resistance to flexing to design.

In addition, by height H 1, H2 and H3 are set in the mode meeting above-mentioned formula (1) ~ formula (3), as LNG container stable on can obtain preferred result.

In addition, as shown in Figure 2, these flat spheroids 2 are fixed on the ambitus of flat spheroid 2 respectively via its upper end, the columnar skirt 3 that its bottom is fixed on foundation sole plate 4 is supported on hull 5.That is, the weight of these flat spheroids 2 is born by hull 5 by skirt 3.

And then as shown in Fig. 1 (a), Fig. 1 (b) and Fig. 2, the first half of these flat spheroids 2 is fixed in upper deck 6 by its bottom, and covered by the continuous print jar 7 extended along ship cephalocaudal direction and beam direction.In addition, between jar 7 and upper deck 6, do not arrange telescopic joint completely, jar 7 becomes rigid body structure.Namely, jar 7 is the structure of the longitudinal strength (relative to ship cephalocaudal direction (longitudinal direction), the bending power produced relative to the power of deadweight, the goods loaded, ripple and the intensity of shear strength) together guaranteeing the boats and ships required with the rule etc. of classification society with hull 5.

In addition, the symbol 8,9 in Fig. 2 represents vertical logical next door, side plate respectively.

As shown in Fig. 1 (a) ~ Fig. 4, in the boat bottom of hull 5, be provided with multiple (in present embodiment being 17) ballast tank 10 along ship cephalocaudal direction and beam direction.

Possess respectively apart from the ballast tank 10 beyond the ballast tank 10 of the nearest position configuration of bow in these ballast tanks 10: the top configured in the mode above the bottom surrounding flat spheroid 2, be configured at the bottom of ship cephalocaudal direction along the side plate 9 of hull 5 and hull bottom (bottom plank) 11 along the circumferential direction of flat spheroid 2.

In addition, as shown in Fig. 1 (a), Fig. 1 (b), Fig. 2 and Fig. 4, at port side and the starboard side of the liquefied gas carrier 1 of present embodiment, be respectively provided with a passage (path) 20 respectively along side plate 9.

This passage 20 sets up for carrying out loading and unloading operation the gangway ladder (topside ladder) being arranged at the harbour (not shown) pulled in shore, and realizes the effect as the path back and forth such as crewman and worker.

As shown in Figures 2 and 4, passage 20 possess extend from the side 7a of jar 7 towards foreign side passage deck 21, to extend from upper deck 6 towards vertical top (or tilt from the side 7a of jar 7 to top) and multiple support units 22 below support channels deck 21.

As shown in Fig. 1 (a) and Fig. 1 (b), passage 20 extends to the 7a front end, side of jar 7 before house (residential development) 23 along the side plate 9 of correspondence.In addition, be separately installed with at the two ends (in Fig. 1 (a) and Fig. 1 (b) for left end and right-hand member) on passage deck 21 for from passage deck about 21 in upper deck 6 or for climbing up the step (not shown) on passage deck 21 from upper deck 6.

And, height (vertical distance) H (m) above from hull bottom 11 to passage deck 21 is set in the scope high and lower than 40 (m) than height D (m)+2 (m) above from hull bottom 11 to upper deck 6, and can set up and be arranged at the height that (after maiden voyage) makes a reservation for all gangway ladders of the harbour pulled in shore.

Liquefied gas carrier 1 according to the present embodiment, when compared with (very) spheroid with the radius R identical with the radius R of the horizontal section of ambitus, the volume being greater than spheroid is guaranteed at sustained height, therefore, can at the situation decline low clearance of same volume compared with spheroid.

Thus, with adopt the situation of spheroid with same volume compared with, the height of the end face 7b from hull bottom 11 to jar 7 of (2% ~ 25%) can be reduced, the compression area of hull entirety can be reduced, can reduce wind pressure resistance, the center-of-gravitys position that can reduce boats and ships can improve stability of hull.

In addition, owing to setting up gangway ladder on the passage 20 configured according to the movable range being arranged at the gangway ladder making a reservation for the harbour pulled in shore, even if so when upper deck 6 is configured at low position, also can set up all gangway ladders being arranged at the predetermined harbour pulled in shore, can make the suitability of the gangway ladder being arranged at harbour good.

And then, the metal piece of mooring is configured in mode as in the past in the upper deck 6 of the below being positioned at passage deck 21, therefore, it is possible to avoid the metal piece of mooring to give prominence to upward above passage deck 21, the trafficability characteristic on passage deck 21 can be improved.

And then, a continuous print jar 7 of the first half covering complete flat spheroid 2 is combined relative to hull 5 rigidity, the structure of the longitudinal strength guaranteeing the boats and ships required with the rule etc. of classification society is together formed with hull 5, therefore, the width of hull 5 can be made to reduce by 2% ~ 4% degree, hull resistance and hull weight can be reduced, can navigation performance be improved, the total amount of the material (such as steel) forming hull 5 can be reduced simultaneously, the reduction of laid down cost can be realized.

And then, as shown in Figure 2, the top of ballast tank 10 is with the circumferential direction along flat spheroid 2, and the mode above the bottom surrounding flat spheroid 2 configures, therefore, the top of these ballast tanks 10 can be continued to use as a part for the skirt 3 of the flat spheroid 2 of supporting, the total amount of the material forming skirt 3 can be reduced, the reduction of laid down cost can be realized.

In addition, liquefied gas carrier 1 according to the present embodiment, also can obtain following effect and advantage.

(1) shape in the southern hemisphere of flat spheroid 2 constructs different from common runner plate, by near liquid level during half loading liquid, be formed as the roughly equal spheroid form of the radius of the horizontal section of radius and ambitus from the scope of equator south latitude 30 degree of degree, thereby, it is possible to the liquid during semi-load of the reliability design complexity identical with existing (very) spheroid rock the buckling problem brought.

(2) southern hemisphere of flat spheroid 2 above-mentioned spherical part more below, namely 30 degree, south latitude more below part by anchor ring portion 37 and the second spherical shell portion 38, and the part that aspect ratio (a/b) is roughly 1.5 is formed, therefore, can the compressing stress produced at curvature because of interior pressure be maintained very little, not need resistance to flexing to design.

(3) by utilizing the first spherical shell portion 36 of being formed with a part for the spheroid of the radius R same radius R4 of ambitus and forming the southern hemisphere with these two parts of the doubtful elliptical section be made up of anchor ring portion 37 and the second spherical shell portion 38 that the below in this first spherical shell portion 36 is connected with, therefore, the making in the southern hemisphere can by being undertaken two part bonding after individually having made the first spherical shell portion 36 and doubtful elliptical section.Therefore, as long as to the first spherical shell portion 36 and doubtful elliptical section design strength, thermal strain, wall thickness etc. respectively, consequently the design in the southern hemisphere and making become easy.

(4) form the anchor ring portion 37 of doubtful elliptical section and the second spherical shell portion 38 to be formed by the part of spheroid, therefore, design and produce and become easy.

(5) anchor ring portion 37 and the first spherical shell portion 36 have identical tangent line, therefore, both can be engaged swimmingly, its result can suppress to produce flexure stress locally at the junction surface in anchor ring portion 37 and the first spherical shell portion 36, and can guarantee the continuity that outward appearance is also round and smooth.

(6) according to above-mentioned (2) ~ (5), simply designing and producing of the southern hemisphere of flat spheroid 2 can be carried out.

In addition, the present invention is more preferably applicable to the total volume in container is 150,000 m ³above liquefied gas carrier.

Total volume in container is 150,000 m ³in above liquefied gas carrier, current container and jar high highland on deck is outstanding, therefore, exist from the degraded appearance viewed from bridge, need highly high superstructure thereupon, the compression area of hull entirety increases, and wind pressure resistance increases, and the center-of-gravity position of boats and ships uprises and the problem of stability deterioration.

But, be 150,000 m by the total volume applied the present invention in container ³above liquefied gas carrier, with adopt the situation of spheroid with same volume compared with, the height of the summit (arctic point) from hull bottom to container of (2% ~ 25%) and the end face of jar can be reduced, the compression area of hull entirety can be reduced, wind pressure resistance can be reduced, the center-of-gravity position of boats and ships can be reduced, the stability of hull can be improved, and existing problem can be solved.

In addition, in above-mentioned embodiment, the rear square end describing passage 20 extends to before house 23, but the present invention is not limited thereto, and the rear square end of passage 20 also can adopt the passage 20 of the side such as extending to house 23.

And, be connected (can back and forth) by the end of the rear side by passage 20 and the stair (such as the second deck) being positioned at house 23 via water door (not shown), can improve in house 23 to passage 20 or from passage 20 to the convenience in house 23.

And then, more preferably the electric wire, oily pipe arrangement, water pipe arrangement, fire-fighting pipe arrangement, pressurized air pipe arrangement etc. of configuration in the space (space by foundation sole plate 4, upper deck 6, vertical logical next door 8, side plate 9 surround) of below being formed at upper deck 6 are configured in the open space (being formed at the space between passage deck 21 and upper deck 6) of the below being formed at passage deck 21 at present.

Thus, maintenance, the upkeep operation of electric wire, oily pipe arrangement, water pipe arrangement, fire-fighting pipe arrangement, pressurized air pipe arrangement etc. easily carry out, and can improve maintainability.

And then, the invention is not restricted to above-mentioned embodiment, such as in the above-described embodiment, making, the inner peripheral surface of the wall portion on the top of the inner peripheral surface of skirt 3 and formation (formation) ballast tank 10 (wall portion that the circumferential direction along flat spheroid 2 exists) 12 (with reference to Fig. 2) is in the same plane, and forms these skirt 3 and wall portion 12 etc. by same parts, do not depart from the scope of technological thought of the present invention to be out of shape as required and implement and change to implement.

And then, in the above-described embodiment, describe and the first half of four the flat spheroids 2 continuous print jar 7 extended along ship cephalocaudal direction and beam direction is covered, but the present invention is not limited thereto, also go for the structure possessing four jars corresponding with each flat spheroid 2.

Claims

1. a liquefied gas carrier, it possesses:

Multiple flat spheroid, the gas of its internal storage liquefaction, and along the configuration of ship cephalocaudal direction, and be fixed on hull via skirt;

A continuous print jar, it covers the first half of these flat spheroids, and extends along ship cephalocaudal direction and beam direction;

Multiple ballast tank, it is located at the boat bottom of described hull;

Described jar has and engages relative to described hull rigidity, forms with described hull the structure integrally guaranteeing longitudinal strength, wherein,

The more top in described flat spheroid portion under the line possesses the cylindrical portion that radius is R and the top be connected with in this cylindrical portion and the top of convex runner plate structure, the more below in portion possesses the bottom being connected with the runner plate structure also convex in the below of described cylindrical portion downwards under the line, and flat spherical shorter than the diameter in equator of the diameter forming vertical direction

Described top has: the spherical shell portion with the radius of β × R of the anchor ring portion with the radius of α × R being connected to the top of described cylindrical portion and the top being connected to this anchor ring portion,

Described anchor ring portion is formed in the scope from the upper end of described cylindrical portion to θ 1, and described α, β and θ 1 meets β=(1-α+α × COS θ 1)/COS θ 1,

The top of each described ballast tank along the circumferential direction of described flat spheroid, and, as described skirt a part and support described flat spheroid.

2. liquefied gas carrier as claimed in claim 1, wherein,

The height of the end face from hull bottom to jar, compared with the height from the hull bottom of liquefied gas carrier to jar end face when adopting spheroid with same volume, reduces by 2% ~ 25%.

3. liquefied gas carrier as claimed in claim 1, wherein,

Total volume in the container of described flat spheroid is 150,000 m ³above.

4. the liquefied gas carrier according to any one of claims 1 to 3, wherein,

Above the upper deck between the side and side plate of described jar, be provided with and be arranged at the gangway ladder of landing pier by the passage set up for carrying out loading and unloading operation.

5. liquefied gas carrier as claimed in claim 4, wherein,

Height H (m) above from hull bottom to described passage to be set in the scope high and lower than 40 (m) than height D (m)+2 (m) above from described hull bottom to described upper deck and to be arranged at all gangway ladders making a reservation for the harbour pulled in shore can by the height set up.