CN102348925B - 一种液化天然气罐的次级膜封闭区 - Google Patents
一种液化天然气罐的次级膜封闭区 Download PDFInfo
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Abstract
一种液化天然气储存容器,由一个承重支架(11)和一个用来盛装液化天然气的防渗隔热气罐组成,其中所述气罐由一组安装在承重支架上的罐壁组成,每块罐壁从罐内到罐外,沿着厚度方向依次为主防渗层、主隔热层、次防渗层和次隔热层,所述罐壁中至少含有一块垂直的罐壁,该垂直罐壁顶部的次防渗层包含一个初级防渗片和一个连接装置,该连接装置可以将初级防渗片与承重支架之间无渗透地连接,所述储存容器中的连接装置由一个与所述初级防渗片平行的初级金属平板(22),还有一个次级防渗片(17)组成,该次级防渗片一头连接在初级防渗片上,另一头连接在初级金属平板上。
Description
技术领域
本发明涉及一种固定于承重支架上的隔热防渗气罐的制造方法。
现有技术
法国专利申请号为FR 2691520和FR 2724623的专利公开了一种固定在以双层船壳为承重支架的隔热防渗气体存储罐的结构,每块气罐壁从内壁到承重支架方向依次为:与罐内储存物直接接触的主防渗层、主隔热层、次防渗层和次隔热层。
主隔热层、次防渗层、次隔热层本质上是由固定在承重支架上多块预制板材构成的。而每块预制板材的相应构成为:首先,一块刚性金属板和一层隔热材料组合成次隔热层;其次,由粘附在次隔热层上的刚性或者柔的防渗片形成次防渗层;第三,将又一层隔热材料部分地覆盖并粘附在次防渗层上;第四,将又一层刚性金属板覆盖在第三点中所述的隔热材料上从而形成主隔热层。
在气罐垂直壁的顶部区域,次防渗层与承重支架相连接,这个区域,也称为“次级膜封闭区”,有关该区域上述材料中均未曾提及。
图1展示了现有技术中次级膜封闭区的横截面图。承重支架1由船的双层船壳构成,包括了垂直部2和水平部3,L型平台4焊接在水平部3上,并向下延伸。
通常的做法是,将多块预制板材(图中没有标出)安装在垂直部2上从而形成主隔热层、次防渗层和次隔热层。图1中标出的是隔热材料层5和防渗层6的最上端部位。
在次级膜封闭区,防渗层6必须与承重支架1实现不渗透连接,实现的办法是:用一张柔性防渗片7一头连接预制板材防渗层6,另一头连接L型平台4,两层胶泥8以图2中所示方式塞在空隙之间,再用螺栓将一条压缩梁连接到L型平台4上。
这种封闭次级膜的方式有几个缺点:
首先,将防渗片7与L型平台连接4连接起来的机械化操作,实现起来很复杂,不但需要连接好防渗片7而且需要使用两层胶泥8和使用螺栓连接压缩梁9。
其次,因为防渗层7和L型平台4之间的连接表面积有限,因此需要训练有素的工人进行操作才能确保天然气不能以液态或气态方式从这个部位漏出。
发明概要
本发明要解决的技术问题是提供一种能够避免上述现有技术中的存在的缺点的气罐。具体而言,本发明的目的之一是使气罐中的次级膜层能够更加便利与承重支架相连接;另一目的是尽最大可能地实现气罐的机械化生产,并尽可能地使产品质量更为可靠。
本发明公开了一种承载液化天然气的容器,该容器由一个承重支架和一个盛装液化天然气的隔热防渗的气罐组成。所述气罐包含了一组安装在承重支架上的气罐壁,每个气罐壁,从内到外,沿着罐壁厚度方向依次为:主防渗层、主隔热层、次防渗层和次隔热层。所述气罐壁包含至少一个垂直壁,在垂直壁顶部的次防渗层中有一个初级防渗片和一个连接装置,该连接装置可将初级防渗片与承重支架非渗透性连接在一起。该容器的特征在于所述连接装置含有一块与初级防渗片相平行的金属平板,第三级防渗片连接在该金属平板上,次级防渗片一头连在初级防渗片上另一头连接在第三级防渗片上。作为一种改进,也可将次级防渗片直接连接在金属平板上。
可以把这个容器比喻成一条船或者是摆放在地面上的罐子。鉴于本发明的前述特征,次级防渗片是分别连接在两个平行的表平面上,因此这种连接操作起来简便可靠、容易实现机械化。初级防渗片的连接工作可以在把它安装在气罐上之前先在工厂做好。金属平板因为是金属的所以可以通过连续焊接方式直接或间接地焊接到承重支架上,这个连续焊接的方式也是操作简便可靠、容易实现机械化。因此本发明就可以省去使用胶泥层,并且,次级防渗片的连接并不依赖于训练有素的技工才能实现。
所述次级防渗片是柔性的,并且在初级防渗片和第三级防渗片之间有一个非连接带。
正因为次级防渗片的柔性和非连接带的存在,由承重支架和次级隔热层导致的震动就可以被次级防渗层吸收。
方便起见,可以将所述金属平板焊接到一个与承重支架相连接的金属组件上。
所述金属组件有一个垂直部和一个水平部,金属平板焊接在垂直部上,水平部连接在承重支架上。
水平部的长度要允许在安装金属组件时,垂直部的位置可以随意调整。调整到使垂直部的位置适合初级防渗片的位置。具体说第三级防渗片是附着于金属平板上的,调整金属平板的位置使第三级防渗片与初级防渗片处于同一水平面上,这样连接起来更为简单。
更理想一点,所述初级防渗片上可粘附一层隔热材料或者一层胶合板,该隔热材料或胶合板也成为次级隔热层的一部分。
在一个实施例中,所述承重支架由一个接地的垂直混泥土墙构成。
在另一个实施例中,所述承重支架由一只浮船的双层船壳构成。
附图说明
为了更清楚地理解发明,也为了使其他对象、细节、特征和优点在以下描述中更为清楚,请参考附图描述,但附图仅仅作为说明阐述发明的一种方式,不构成对发明范围的任何限制。
图1是现有技术中次级膜封闭区的横截面图;
图2是图1的局部放大图;
图3是本发明的一个实施例中,气罐的次级膜封闭区的横截面图;
图4和图5是图3的局部放大图;
图6是图3中所述气罐的拐角处次级膜封闭区的透视图;
图7和图8展示的是图6中拐角处的支架;
图9是与图6几乎相同的图,只是其中部分部件被移除;
图10是本发明另外一个实施例中气罐的次级膜封闭区的横截面图;
图11和图12是图10的局部放大图;
图13是图10中气罐次级膜封闭区的拐角处的透视图。
实施例
图3-9是展现了本发明中气罐的第一个技术细节,这个气罐有几个气罐壁,并安装在一个承重结构架11上。这个承重结构架11也可以是双壳船或其他种类的浮船。
在现有技术中公开的气罐壁从气罐内部到外部沿着壁厚方向依次排列有:主防渗层、主隔热层、次防渗层和次隔热层。
与现有技术中的描述相类似,本发明中由主隔热层、次防渗层和次隔热层组成了安装于承重结构架11上的预制板材主体结构。
具体来说,次防渗层由一组防渗片组合而成,防渗片又由两面玻璃纤维布构成的外层和位于其中的约0.1毫米厚的铝箔内层组成。依照制造方法不同,防渗片可制成刚性和柔性两种。因此,每块预制板材部分地包含了粘在一层隔热物质上的刚性防渗片,而在相邻板材的连接处,则由柔性防渗条与毗邻的刚性防渗条连接。
在垂直气罐壁的顶部区域,次防渗层(也称次级膜)与承重结构架11相连接。如图3所示的横截面图,这个区域就是被通常称为的次级膜封闭带,图4和图5是图3的局部放大图。
承重结构11包含了一个垂直面12和一个水平面13,一个“L”形的平板14焊接在水平面13上,平板14包含一个向下延伸的垂直部27,该垂直部与垂直面12相平行,平板14还包含一个位于垂直部27底端的水平部28,该水平部28朝着远离垂直面12的方向延伸一段距离。
一个固定支架20,安装在水平部28下面,一个“U”形箍筋21将该固定支架20与平板14固定在一起。具体地说,箍筋21有两个平行臂30,通过一个与平行臂垂直的竖壁29连接在一起,其中一个平行臂与平板14的水平部28固定,另一个平行臂与固定支架20固定在一起。
可以看到,首先,承重结构11和平板14与现有技术图1中的相应部件的形状是一样的,换句话说,本发明没有必要去改动现有的承重结构的形状。其次,固定支架20和箍筋21可以通过连续焊接以一种机械化和可靠的方式轻松地固定在一起。
在图3到5中,在气罐壁顶部可以看到预制板材中的隔热材料层15,这个隔热材料层15除上边缘外,其余部位被一张刚性防渗片16所覆盖,隔热材料层15的上边缘比其他部位更薄,并且在板材上有一张含有水平凹槽25的凹脸24。在固定箍筋时,由于箍筋的几何形状允许它可水平移动,因此可以通过调节箍筋位置使凹脸24和箍筋21的竖壁29大概处于同一平面位置上。
一个金属板22焊接在箍筋的竖壁29上,并向下延伸覆盖住凹脸部位直至凹槽25的位置。金属平板22的下端边缘26向凹槽25中弯伸。一条刚性防渗片23粘在金属平板22上。
如图5所示,一条柔性防渗片17同时连接在防渗片16和防渗片23上,在防渗片16和防渗片23中间是一个非连接带,很显然,这个连接操作是在两个平行的刚性防渗片表面进行的,因此,这个操作简便易行,并且可实现机械化操作,其连接质量上也很可靠。作为一种改变,也可以没有防渗条23,防渗条17直接连接在金属平板22上。
上述结构使得附着于预制板材上的防渗片16,通过柔性防渗片17、刚性防渗片23(也可不要)、金属平板22、箍筋21、和平板14与承重结构架防渗透性连接。并且,防渗片17的柔韧性,并且通过在防渗层23和防渗层16间留出一个非连接空间带,使得承重支架11和次隔热层所带来的震动为次防渗层所吸收。
图6是由两个垂直汽灌壁所形成的夹角的透视图,在每个气罐壁上,以上描述的某些部件可以看到。
图7与图6大致相同,区别在于,在图7中,在两气罐壁的角落处安装了一个支架31用来固定柔性的防渗片17的位置。这么做的原因是,平面上的连接点承受了弯角区域产生垂直于平面连接处的形变热力,这样可能导致连接点分离脱落。当然,根据气罐的大小和粘结特性的不同,对支架31的需求也可能不同。图8更清楚第展示了支架31和其固定螺栓。
图9与图6基本一样,不同之处在于,柔性的防渗片17被撤走,以便更好地展示其所覆盖部位的技术特征。从图中可以看到:刚性防渗片23沿着气罐壁呈现平面带的形状,而在现有技术中,这样的平面带是由两层玻璃纤维布分别附着于一张铝箔的两面,然后侵泡在树脂中,待树脂固化热压而成。在拐角处,刚性防渗片23呈“L”带状。这种非平面带状刚性防渗片可以在一个相应形状的模具中,在一定的温度和压力作用下,通过树脂固化的方法制备。作为改进,在拐角处可使用柔性的防渗片23,以便适合拐角处的形状要求。
图10到图13,展示的是本发明中气罐的另外一个实施例。气罐有几面气罐壁并建立在一个承重支架111上。承重支架111是由预应力混泥土制成的垂直墙构建成的,在这个实施例中,由承重支架111和气罐形成了一个以地面为基地的天然气储存容器。
金属平板114固定在承重支架111上,譬如可以在浇灌混泥土时金属平板114就可以固定了。另外一块金属板120焊接在金属板114上,并呈水平延伸状。
与第一个实施例类似,气罐的主隔热层、次防渗层和次隔热层是由安装在承重支架111上的多块预制板材构成的。图11主要展示了每块预制面板上部有一层隔热材料115,其上覆盖着一层胶合板132,胶合板132上又覆盖着一层刚性防渗片116,除了一个更薄的上边界外,胶合板132上还有有一个凹脸124。
金属平板122用螺钉固定在胶合板132上,在凹脸124上留有一个未覆盖区域133,该区域紧邻上覆一层防渗片116的胶合板132。金属平板122被一刚性防渗片123所部分覆盖。
如图12所示,一柔性防渗片117一头连接在防渗片116上,另一头连接在防渗片123上,在防渗片116和12之间是无连接的空白地带,可以看出,这个连接操作是在两个刚性防渗条的平行表面进行的,因此该操作简便可靠,并且容易实现机械化操作。由于防渗片116和123几乎是同一水平面上,因此连接工作更为简易。作为一种变形,不要防渗片123,防渗片117直接连接在金属平板122上。
金属角钢121一端焊接在金属平板120上,一段焊接在金属平板122上。更具体说,角钢121的水平边与金属板120焊接在一起,垂直边129与金属板122焊接在一起。
因此上述结构,通过柔性的防渗片117、刚性的防渗片123、金属平板122,角钢121、以及金属平板120和114,使得预制板材上的防渗片116与承重支架111之间实现无渗透连接。并且防渗片117能够以自动化和可靠的方式顺利连接。角钢121的几何形状允许其位置做一定调整以与金属平板122的位置相契合。
图13显示的是次级膜封闭区的透视图,可以清楚地看到两个相邻垂直壁形成的拐角区133,这个拐角的角度相比第一个实施例中的拐角角度更大,因此剥离脱落的风险就小得多,当然,根据气罐的大小和产生剥离的不同特性,可以选择性地使用安全支架,其使用的方式方法与第一个实施例中支架31的方式方法是一样的。
尽管本发明已经公开了数种实施例,但本专利的保护范围并不限于上述实施例,凡在本发明保护范围之列的各技术特征的组合或者等同技术特征均在本专利保护之列。
上述的两个实施例中,柔性防渗片与金属平板22或者122形成的连接装置可以使预制板材上的防渗片与承重支架之间实现无渗透连接。上述描述中,其中一个连接装置应用于浮船上,另一个连接装置应用于接地容器中,需要明确的是,上述两种连接装置既可以应用于浮船装置中也可以应用于接地容器中。
Claims (9)
1.一种液化天然气储存容器,由一个承重支架(11,111)和一个用来盛装液化天然气的防渗隔热气罐组成,其中所述气罐由一组安装在承重支架上的罐壁组成,每块罐壁从罐内到罐外,沿着厚度方向依次为主防渗层、主隔热层、次防渗层和次隔热层,所述罐壁中至少含有一块垂直的罐壁,该垂直罐壁顶部的次防渗层包含一个初级防渗片(16,166)和一个连接装置,该连接装置可以将初级防渗片与承重支架之间无渗透地连接,所述储存容器的特征在于其连接装置由一个与所述初级防渗片平行的初级金属平板(22,122)和一个次级防渗片(17,177)组成,该次级防渗片一头连接在该初级防渗片上,另一头连接在该初级金属平板上。
2.如权利要求1所述储存容器,其中所述的次级防渗片是柔性的,并且在与初级防渗片和初级金属平板连接时,在二者之间保留了一个未连接带。
3.如权利要求1所述储存容器,其中有一个第三级防渗片(23,123)连接在所述金属平板上,所述次级防渗片连接在该第三级防渗片上。
4.如权利要求2所述储存容器,其中有一个第三级防渗片(23,123)连接在所述金属平板上,所述次级防渗片连接在该第三级防渗片上。
5.如上述任一权利要求所述储存容器,其中所述初级金属平板焊接在一个与承重支架相连接的金属组件(21,121)上。
6.如权利要求5所述储存容器,其中所述金属组件有一垂直部(29,129)和一平行部(30,130),初级金属平板焊接在该垂直部,该平行部与承重支架相连接。
7.如权利要求1-4之一所述储存容器,其中初级防渗片连接在一层隔热材料(15)或者一块胶合板(132)上,该隔热材料或者胶合板成为次级隔热层的组成部分。
8.如权利要求1-4之一所述储存容器,所述承重支架由安装于地面的垂直水泥墙构成。
9.如权利要求1-4之一所述储存容器,其中所述承重支架由浮船的双层船壳组成。
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2009
- 2009-04-14 FR FR0952425A patent/FR2944335B1/fr active Active
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