CN111788428B - 双层壳罐和液化气运输船 - Google Patents
双层壳罐和液化气运输船 Download PDFInfo
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Abstract
双层壳罐具有:内槽,其具有内槽主体部和内槽圆顶;内槽检修孔;外槽,其具有外槽主体部和外槽圆顶,该外槽主体部隔着第1真空空间而包围内槽主体部,该外槽圆顶隔着第2真空空间而包围内槽圆顶;外槽检修孔;波纹管,其以将外槽圆顶分割成下侧的固定部和上侧的可动部的方式组装于外槽圆顶;内侧环,其在第2真空空间内固定于内槽圆顶;外侧环,其在第2真空空间内固定于外槽圆顶的可动部,并且位于比内侧环靠下方的位置;以及筒状的隔壁,其连结内侧环和外侧环,将第2真空空间分隔为上侧真空空间和下侧真空空间,隔壁的中央部的厚度比该隔壁的两端部的厚度薄。
Description
技术领域
本发明涉及双层壳罐和具有该双层壳罐的液化气运输船。
背景技术
以往,公知有低温的液化气用的双层壳罐。例如,在专利文献1中公开了在内槽与外槽之间形成有真空隔热层的双层壳罐。
具体而言,内槽包含贮存液化气的内槽主体部和从内槽主体部向上突出的内槽圆顶,外槽包含包围内槽主体部的外槽主体部和包围内槽圆顶的外槽圆顶。内槽圆顶是用于将贯穿内槽的配管汇集起来的部件,这些配管以贯穿内槽圆顶和外槽圆顶的方式配置。内槽主体部和外槽主体部之间是第1真空空间,内槽圆顶和外槽圆顶之间是第2真空空间。
当向内槽内投入液化气时,内槽热收缩。为了防止由于该内槽的热收缩而对配管作用大的应力,在专利文献1的双层壳罐中,在外槽圆顶上组装有波纹管。通过该波纹管,将外槽圆顶分割成被配管贯穿的上侧的可动部和下侧的固定部。
外槽圆顶的可动部由内槽圆顶支承。在专利文献1的图12中,公开了通过悬吊构造来支承外槽圆顶的可动部的结构。具体而言,在内槽圆顶与外槽圆顶之间的第2真空空间内配置有内侧环、筒状的隔壁以及外侧环。内侧环固定在内槽圆顶上,外侧环在比内侧环靠下方的位置固定在外槽圆顶的可动部上。隔壁连结内侧环和外侧环。
隔壁还起到将第2真空空间分隔成下侧真空空间和上侧真空空间的作用。在专利文献1的图12中,在内槽圆顶的上部设置有内槽检修孔(manhole),并且在外槽圆顶的上部设置有外槽检修孔。通过由隔壁将第2真空空间分隔成下侧真空空间和上侧真空空间,在外槽检修孔被打开时真空隔热层中的处于大气压的容积被抑制得较小。
现有技术文献
专利文献
专利文献1:日本特开2015-4383号公报
发明内容
发明要解决的课题
但是,在专利文献1的图12的结构中,虽然通过内槽与外槽之间的真空隔热层来防止热量从外槽外向内槽内侵入,但希望进一步降低经由外侧环、隔壁以及内侧环的热传导所引起的热侵入。从这样的观点出发,优选隔壁的厚度较薄。另一方面,从隔壁与外侧环和内侧环的接合部的强度的观点出发,优选隔壁的厚度较厚。
因此,本发明的目的在于,提供能够充分确保隔壁与外侧环和内侧环的接合部的强度,并且能够减少经由外侧环、隔壁以及内侧环的热侵入的双层壳罐以及包含该双层壳罐的液化气运输船。
用于解决课题的手段为了解决上述课题,本发明的双层壳罐的特征在于,具有:内槽,其包含内槽主体部和内槽圆顶,该内槽主体部贮存液化气,该内槽圆顶从所述内槽主体部向上突出;内槽检修孔,其设置在所述内槽圆顶的上部;外槽,其包含外槽主体部和外槽圆顶,该外槽主体部隔着第1真空空间而包围所述内槽主体部,该外槽圆顶隔着第2真空空间而包围所述内槽圆顶;外槽检修孔,其设置在所述外槽圆顶的上部;波纹管,其以将所述外槽圆顶分割成下侧的固定部和上侧的可动部的方式组装于所述外槽圆顶;内侧环,其在所述第2真空空间内固定于所述内槽圆顶;外侧环,其在所述第2真空空间内固定于所述外槽圆顶的可动部,并且位于比所述内侧环靠下方的位置;以及筒状的隔壁,其连结所述内侧环和所述外侧环,将所述第2真空空间分隔为上侧真空空间和下侧真空空间,该上侧真空空间包含所述内槽检修孔与所述外槽检修孔之间的区域,所述隔壁的中央部的厚度比该隔壁的两端部的厚度薄。
根据上述结构,由于隔壁的中央部的厚度变薄,所以与隔壁为一定厚度的筒状的情况相比,能够减少经由外侧环、隔壁以及内侧环的热侵入。而且,在内槽热收缩时,内槽圆顶也缩径,但此时,由于隔壁的中央部的厚度变薄,所以隔壁以截面呈大致S字状的方式变形。因此,可防止对隔壁与外侧环的接合部和隔壁与内侧环的接合部作用较大的应力。由此,可充分确保隔壁与外侧环和内侧环的接合部的强度。
也可以是,所述隔壁的外周面在该隔壁的中央部向径向内侧凹陷。根据该结构,与隔壁的内周面在中央部向径向外侧凹陷的情况相比,从内槽圆顶的轴向观察时的隔壁的中央部的截面面积变小。因此,与隔壁的内周面在中央部向径向外侧凹陷的情况相比,能够有效地减少经由外侧环、隔壁以及内侧环的热侵入。
另外,本发明的液化气运输船的特征在于,具有上述的双层壳罐。
发明效果
根据本发明,能够充分地确保隔壁与外侧环和内侧环的接合部的强度,并且能够减少经由外侧环、隔壁以及内侧环的热侵入。
附图说明
图1是本发明的一个实施方式的双层壳罐的剖视图。
图2是将图1的主要部分放大后的剖视图。
图3是将图2的主要部分放大后的剖视图。
图4是示出内槽圆顶缩径时的状态的图。
具体实施方式
图1示出了本发明的一个实施方式的双层壳罐2。该双层壳罐2例如作为仓罐而搭载在液化气运输船1上。但是,双层壳罐2不一定必须作为仓罐而搭载在液化气运输船1上,也可以作为燃料罐而搭载在其他船舶上。或者,双层壳罐2也可以设置在地上。
在本实施方式中,双层壳罐2是水平方向较长的圆筒状。但是,双层壳罐2的形状也可以是球形状,还可以是立方体状或长方体状。
双层壳罐2包含内槽3和外槽4,在内槽3与外槽4之间形成有真空隔热层。外槽4在沿双重壳罐2的轴向相互分开的位置由设置在船体11上的一对鞍座12支承。另一方面,在内槽3与外槽4之间配置有在与鞍座12相同的位置对内槽3进行支承的一对支承部件13。
具体而言,内槽3包含:内槽主体部31,其贮存液化气;以及内槽圆顶32,其从内槽主体部31向上突出。外槽4包含:外槽主体部41,其隔着第1真空空间21而在整体上包围内槽主体部31;以及外槽圆顶42,其隔着第2真空空间22而在整体上包围内槽圆顶32。
液化气例如为液化石油气(LPG,约-45℃)、液化乙烯气体(LEG,约-100℃)、液化天然气(LNG,约-160℃)、液化氢(LH2,约-250℃)、液化氦(LHe,约-270℃)。
内槽主体部31包含以一定的截面形状沿水平方向延伸的主体部和将该主体部的两侧的开口封闭的半球状的封闭部。但是,封闭部可以是与主体部垂直的平面,也可以是盘状。内槽圆顶32从内槽主体部31的主体部向上突出。内槽圆顶32的突出方向在本实施方式中与铅垂方向平行,但也可以相对于铅垂方向稍微倾斜。
内槽圆顶32是用于将贯穿内槽的多个配管14(在图1中,为了简化附图而仅图示1根配管14)汇集起来的部件,这些配管14以贯穿内槽圆顶32和外槽圆顶42的方式配置。
外槽主体部41具有将内槽主体部31扩大后的形状。即,外槽主体部41包含:主体部,其以一定的截面形状沿水平方向延伸,并且直径比内槽主体部31的主体部的直径大;以及半球状的封闭部,其将该主体部的两侧的开口封闭。外槽圆顶42也具有将内槽圆顶32扩大后的形状。
接着,参照图2对内槽圆顶32和外槽圆顶42进行详细说明。
内槽圆顶32包含从内槽主体部31立起的管状的周壁33和将周壁33的上侧开口封闭的顶壁34。在内槽圆顶32的上部设置有内槽检修孔5。在本实施方式中,在顶壁34上设置有内槽检修孔5。在图例中,内槽检修孔5设置在顶壁34的中心,但内槽检修孔5也可以设置在偏离顶壁34的中心的位置。或者,内槽检修孔5也可以在比后述的内侧环7靠上方的位置设置在周壁33上。
内槽检修孔5由贯穿顶壁34的检修孔管51形成,并被检修孔盖52封闭。检修孔盖52通过螺栓等固定在设置于检修孔管51的上端的凸缘上。
同样,外槽圆顶42包含从外槽主体部41立起的管状的周壁43和将周壁43的上侧开口封闭的顶壁44。在外槽圆顶42的上部设置有外槽检修孔6。在本实施方式中,在顶壁44上设置有外槽检修孔6。在图例中,外槽检修孔6设置在顶壁44的中心,但外槽检修孔6也可以设置在偏离顶壁44的中心的位置。或者,外槽检修孔6也可以在比后述的外侧环9靠上方的位置设置在周壁43上。
外槽检修孔6由贯穿顶壁44的检修孔管61形成,并被检修孔盖62封闭。检修孔盖62通过螺栓等固定在设置于检修孔管61的上端的凸缘上。
在图例中,上述的配管14贯穿内槽圆顶32的周壁33和外槽圆顶42的周壁43,但配管14也可以贯穿内槽圆顶32的顶壁34和外槽圆顶42的顶壁44。
在外槽圆顶42的周壁43上组装有波纹管45。波纹管45将外槽圆顶42分割成下侧的固定部42A和上侧的可动部42B。可动部42B是被配管14贯穿的部分,并且是设置有外槽检修孔6的部分。
在内槽圆顶32与外槽圆顶42之间的第2真空空间22内配置有内侧环7、筒状的隔壁8以及外侧环9。内侧环7、隔壁8以及外侧环9构成对外槽圆顶42的可动部42B进行支承的悬吊构造。
内侧环7是平行于与内槽圆顶32的轴向(突出方向)垂直的径向的板。内侧环7固定在内槽圆顶32上。例如,内侧环7的内周缘部通过焊接而与周壁33的外周面接合。
外侧环9是与内侧环7平行的板。外侧环9位于比内侧环7靠下方的位置,并固定在外槽圆顶42的可动部42B上。例如,外侧环9的外周缘部通过焊接而与周壁43的内周面接合。
隔壁8连结内侧环7和外侧环9。由此,第2真空空间22被分隔为上侧真空空间24和下侧真空空间23。上侧真空空间24是包含内槽检修孔5与外槽检修孔6之间的区域的空间。即,上侧真空空间24在外槽检修孔6被打开时通过外槽检修孔6而与大气空间连通,在内槽检修孔5被打开时通过内槽检修孔5而与内槽3内的空间连通。
在本实施方式中,在隔壁8的内周面接合有内侧环7的外周缘部,在外侧环9的上表面接合有隔壁8的下端部。在这些接合中例如使用焊接。但是,隔壁8的上端部也可以与内侧环7的下表面接合,外侧环9的内周缘部也可以与隔壁8的外周面接合。
如图3所示,隔壁8的中央部8b的厚度比该隔壁8的上端部8a和下端部8c的厚度薄。另外,隔壁8的上端部8a的厚度和下端部8c的厚度可以相同也可以不同。
在本实施方式中,隔壁8的外周面在中央部8b向径向内侧凹陷。换言之,在隔壁8的中央部8b形成有向径向外侧开口的沿周向连续的槽。但是,隔壁8的内周面也可以在中央部8b向径向外侧凹陷。
此外,在本实施方式中,由隔壁8的上端部8a、中央部8b以及下端部8c形成的槽的形状呈上下对称。即,上端部8a和中央部8b之间的倾斜面的角度与下端部8c和中央部8b之间的倾斜面的角度相同。但是,由隔壁8的上端部8a、中央部8b以及下端部8c形成的槽的形状也可以是上下不对称的。
如以上说明的那样,在本实施方式的双层壳罐2中,由于隔壁8的中央部8b的厚度变薄,所以与隔壁8为一定厚度的筒状的情况相比,可以减少经由外侧环9、隔壁8以及内侧环7的热侵入。而且,在内槽3热收缩时,内槽圆顶32也缩径,但此时,由于隔壁8的中央部8b的厚度变薄,所以隔壁8如图4所示那样以截面呈大致S字状的方式变形。因此,可防止对隔壁8与外侧环9的接合部和隔壁8与内侧环7的接合部作用较大的应力。由此,可充分确保隔壁8与外侧环9和内侧环7的接合部的强度。
另外,在本实施方式中,由于隔壁8的外周面在中央部8b向径向内侧凹陷,所以与隔壁8的内周面在中央部8b向径向外侧凹陷的情况相比,从内槽圆顶32的轴向观察时的隔壁8的中央部8b的截面面积变小。因此,与隔壁8的内周面在中央部8b向径向外侧凹陷的情况相比,能够有效地减少经由外侧环9、隔壁8以及内侧环7的热侵入。
另外,本发明并不限定于上述的实施方式,能够在不脱离本发明的主旨的范围内进行各种变形。
标号说明
1:液化气运输船;2:双层壳罐;21:第1真空空间;22:第2真空空间;23:下侧真空空间;24:上侧真空空间;3:内槽;31:内槽主体部;32:内槽圆顶;4:外槽;41:外槽主体部;42:外槽圆顶;5:内槽检修孔;6:外槽检修孔;7:内侧环;8:隔壁;8a:上端部;8b:中央部;8c:下端部;9:外侧环。
Claims (3)
1.一种双层壳罐,其具有:
内槽,其包含内槽主体部和内槽圆顶,该内槽主体部贮存液化气,该内槽圆顶从所述内槽主体部向上突出;
内槽检修孔,其设置在所述内槽圆顶的上部;
外槽,其包含外槽主体部和外槽圆顶,该外槽主体部隔着第1真空空间而包围所述内槽主体部,该外槽圆顶隔着第2真空空间而包围所述内槽圆顶;
外槽检修孔,其设置在所述外槽圆顶的上部;
波纹管,其以将所述外槽圆顶分割成下侧的固定部和上侧的可动部的方式组装于所述外槽圆顶;
内侧环,其在所述第2真空空间内固定于所述内槽圆顶;
外侧环,其在所述第2真空空间内固定于所述外槽圆顶的可动部,并且位于比所述内侧环靠下方的位置;以及
筒状的隔壁,其连结所述内侧环和所述外侧环,将所述第2真空空间分隔为上侧真空空间和下侧真空空间,该上侧真空空间包含所述内槽检修孔与所述外槽检修孔之间的区域,
所述隔壁的中央部的厚度比该隔壁的两端部的厚度薄。
2.根据权利要求1所述的双层壳罐,其中,
所述隔壁的外周面在该隔壁的中央部向径向内侧凹陷。
3.一种液化气运输船,其中,
该液化气运输船具有权利要求1或2所述的双层壳罐。
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US9587787B2 (en) * | 2013-04-23 | 2017-03-07 | Kawasaki Jukogyo Kabushiki Kaisha | Support structure of ship tank, and liquefied gas carrier |
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