CN102428310B

CN102428310B - Heat insulation pipe

Info

Publication number: CN102428310B
Application number: CN201080021178.4A
Authority: CN
Inventors: 上田伸; 野本哲志; 柳原成道; 末田义一
Original assignee: NIPPON REINETSU CO Ltd; Mitsubishi Heavy Industries Ltd
Current assignee: Nippon Reinetsu Co ltd; Mitsubishi Shipbuilding Co Ltd
Priority date: 2009-11-20
Filing date: 2010-11-18
Publication date: 2014-09-24
Anticipated expiration: 2030-11-18
Also published as: WO2011062237A1; JP2011106648A; JP5448743B2; CN102428310A; KR20120021306A; KR101356316B1

Abstract

Disclosed is a heat insulation pipe which can prevent the cold storage property from deteriorating and a cold spot from occurring as well as prevent the workability from deteriorating. The heat insulation pipe is provided with a pipe main body which is substantially formed into a cylindrical shape and which allows low-temperature fluid to pass therethrough, a plurality of heat insulation portions (3, 3) which surround the pipe main body as a single layer in the circumferential direction and which are aligned in the longitudinal direction, internal connecting portions (41) which are disposed on the inner side in the radial direction between the adjacent heat insulation portions (3, 3) so as to be in contact with the adjacent heat insulation portions (3, 3) and which are composed of a heat insulation fibrous material, external connecting portions (42); which are disposed on the outer side in the radial direction between the adjacent heat insulation portions (3, 3) so as to be in contact with the adjacent heat insulation portions (3, 3) and which are composed of a heat insulation rubber material.

Description

Heat insulation pipe

Technical field

The present invention relates to be suitable for delivering cryogenic fluid, particularly LNG Liquefied natural gas (hereinafter referred to as " LNG ".) heat insulation pipe.

Background technique

In the existing equipment for the treatment of LNG, no matter be that equipment on the ground is also arranged on the equipment on LNG ship, in order to prevent the gasification of LNG, conventionally with cold insulation, with the pipe arrangement that heat insulating member covers, carry LNG.

In general, as the polyurethane of heat insulating member, for example, compare with the material (, stainless steel) that forms the tube body of pipe arrangement, its linear expansion coeffcient is larger.Therefore, when the flow through inside of pipe arrangement of LNG, pipe arrangement body temperature step-down, thus the relative tube body of polyurethane shrinks, and the inside of polyurethane can produce stress.

Therefore, in the prior art, in order to relax this stress, general adopt the thermoinsulation material that polyurethane is formed to be divided into internal side diameter and outside diameter and make inside thermoinsulation material and the heat insulating member in outside between non-bonding and allow the structure that the two relatively moves.

By such structure, absorb the flexible poor of pipe arrangement main body and polyurethane.

On the other hand, with improve the heat-insulating property etc. of heat insulating member and the situation that thermoinsulation material is divided into the structure of internal side diameter and outside diameter compared, in order to improve application property, proposed be not divided under the prerequisite of internal side diameter and outside diameter, adopt individual layer heat insulating member to cover new departure (for example,, with reference to patent documentation 1) of pipe arrangement.

Adopting individual layer heat insulating member to cover in the situation of pipe arrangement, be difficult to cover pipe arrangement integral body with single heat insulating member.That is to say, as noted above, when the flow through inside of pipe arrangement of LNG, pipe arrangement body temperature step-down, thus the relative tube body of polyurethane shrinks, and the inside of polyurethane can produce stress, is therefore difficult to cover pipe arrangement integral body with single heat insulating member.

For relaxing this stress, with predetermined distance, cut off heat insulating member, on the length direction of pipe arrangement, be set up in parallel a plurality of heat insulating members, and the gap between the heat insulating member of adjacency arranges joint.

As joint, can enumerate the parts that make the heat insulating member layer of hard polyurethane foams foamed solidification form in the periphery such as the ring-type liner by hard polyurethane foam, and dispose parts of glass wool etc.

Prior art document

Patent Document 1: Japanese Patent Publication 7-42898 communique

Summary of the invention

The technical problem that invention will solve

Yet, as noted above, heat insulating member is divided into the construction time and the engineering cost that in the double layer construction of internal side diameter and outside diameter, exist setting to there is the pipe arrangement of this structure and becomes large problem.

Particularly in the situation that for the LNG equipment of LNG ship, when the pipe arrangement on the aged ship increasing will more renew pipe arrangement from now on, just there is the problem of constructional difficulties.

On the other hand, in the situation that the pipe arrangement that patent documentation 1 is recorded owing to adopting individual layer heat insulating member to cover tube body, thereby is compared with the method that is the double-deck heat insulating member of employing, it can solve the bad problem of application property.

Yet, because making the insulation material layer of hard polyurethane foams foamed solidification formation, employing carrys out the heat insulating member of bonding adjacency, thereby gap flexible insufficient that can cause the heat insulating member of adjacency, just there is thus the inadequate problem of mitigation of stress that the inside of polyurethane is produced.

And, extend to the outside of heat insulating member on the surface of gap between the heat insulating member of adjacency towards radial outside from tube body, even if clog herein in the situation of glass wool, glass wool is compared with polyurethane, its cold insulation is lower, thereby just occurs producing the problem of cold spot.

So-called cold spot refers to because cold insulation is not enough, produces the phenomenon of its surface attachment ice.

The present invention makes in order to solve above-mentioned problem, and its object is to provide a kind of heat insulation pipe, and it has to pursue and prevents that cold insulation from worsening and produce cold spot, and can pursue the effect that prevents that application property from worsening.

Technological scheme for technical solution problem

In order to reach above-mentioned purpose, the invention provides following technological scheme.

The invention provides a kind of heat insulation pipe, it is characterized in that, it is provided with: tube body, and it forms roughly tubular and internal flow cryogen; A plurality of insulation, it layeredly covers this tube body circumferentially single, and configures side by side at length direction; Inner side joint, the configuration of joining of the described insulation of its radially inner side between the described insulation of adjacency and adjacency, and formed by fiber heat insulating member; And outside joint, the configuration of joining of the described insulation of its radial outside between the insulation of adjacency and adjacency, and formed by rubber-like heat insulating member.

According to the present invention, between the insulation of adjacency, from radially inner side, dispose successively toward the outer side the inner side joint being formed by fiber thermoinsulation material and the outside joint being formed by rubber-like thermoinsulation material, therefore compare with the situation that only disposes fiber thermoinsulation material, can pursue the cold insulation that improves this part.

On the other hand, in the situation that tube body is different from the linear expansion coeffcient between insulation, when the internal flow cryogen of tube body, between the heat distortion amount of tube body and the heat distortion amount of insulation, heat distortion amount can be produced poor.

Now, the gap between the insulation of adjacency can differing from or broaden or narrow down along with above-mentioned heat distortion amount.Because inner side joint is easily to produce the fiber thermoinsulation material of distortion, and outside joint is to have flexible rubber-like thermoinsulation material, thereby the expansion in the gap of corresponding configuration inner side joint and outside joint and dwindling, and can be easy to distortion.

Therefore, owing to allowing that insulation produces thermal distortion, the difference by above-mentioned heat distortion amount can relax the stress that affect insulation, and prevention insulation produces breakage.

And, owing to radially only covering tube body by single insulation, thereby compare with situation about covering by double-deck insulation, easily insulation is installed on tube body.

In foregoing invention, described outside joint is preferably configured between the described insulation of adjacency under the state towards described length direction compression.

According to the present invention, even in the situation that the gap enlargement between the insulation of adjacency, the outside joint of compressed configuration expands, thereby the gap of above-mentioned expansion can be filled by outside joint.

The effect of invention

According to heat insulation pipe of the present invention, between the insulation of adjacency, from radially inner side, dispose successively toward the outer side the inner side joint being formed by fiber heat insulating material and the outside joint being formed by rubber-like heat insulating material, therefore can play and pursue the effect that prevents that cold insulation from worsening and preventing cold spot.

And, by covering tube body by individual layer insulation, can play and pursue the effect that prevents that application property from worsening.

Accompanying drawing explanation

Fig. 1 is for the ideograph of the structure of the heat insulation pipe that relates to the first embodiment of the present invention is described.

Fig. 2 is the part amplification view for the structure of the insulation of explanatory drawing 1.

Fig. 3 is the ideograph for the structure of the joint of explanatory drawing 2.

Fig. 4 is the ideograph for the structure at the joining portion of explanatory drawing 2.

Embodiment

The heat insulation pipe that relates to the first embodiment of this invention below with reference to Fig. 1～Fig. 4 explanation.

Fig. 1 is for the ideograph of the structure of the heat insulation pipe that relates to the first embodiment of the present invention is described.Fig. 2 is the part amplification view for the structure of the insulation of explanatory drawing 1.

In the present embodiment, for the heat insulation pipe 1 for the conveying of LNG in LNG equipment, the present invention is described.LNG refers to the rock gas fluid of liquefaction, and temperature is approximately the cryogenic liquide of-162 ℃.

In addition, fluid in the internal flow of heat insulation pipe 1 can be above-mentioned LNG, can be also other cryogens that need to keep low-temperature condition to carry, for example, need to reduce the gasification ratio being caused by the intrusion thermal conductance from outside, the fluid that maintains sufficient liquid, be not particularly limited.

As shown in Figure 1 and Figure 2, heat insulation pipe 1 is provided with tube body 2, insulation 3, joint 4 and joining portion 5.

As shown in Figure 1 and Figure 2, tube body 2 is the inner cylinder-like part with the mobile stream of LNG, for example, and the parts that formed by stainless steel and other metal materials.

The two ends of tube body 2 are provided with for connecting the flange 21 of the tube body 2 of adjacency.

Insulation 3 is for the surrounding of tube body 2 being covered into the parts of tubular, for suppressing to enter into from outside the heat of the LNG of the inside that flows in tube body 2.

Insulation 3 is provided with the foaming body polyurethane foam 31 forming and the shell 32 being formed by fiber-reinforced plastic (FRP) by polyurethane resin.

Polyurethane foam 31 is for suppressing the hot heat insulating member of the LNG of the inside from outside flow in tube body 2, for the outer surface of tube body 2 is covered into tubular.

Polyurethane foam 31 is configured to, circumferentially covering tube body 2, relative to tube body 2, on length direction (left and right directions of Fig. 1 and Fig. 2), can move.In other words, between polyurethane foam 31 and tube body 2, by binder etc., do not fix.

As polyurethane foam 31, preferably use density to be about 40kg/m ³the material of left and right.

On the other hand, the material as forming polyurethane foam 31, can be used the well known materials such as polystyrene foam, polyethylene or phenol formaldehyde foam, is not particularly limited.

Shell 32 is for covering the cylinder-like part of the outer circumferential face of polyurethane foam 31, and for the protection of polyurethane foam 31.

The terminal part of shell 32, in other words, the portion that is closely close to of flange 21, as shown in Figure 1, near the outer circumferential face formation plane of inclination of tube body 2, the outer circumferential face of tube body 2 is fixed in the end of flange 21 sides.

Joint 4 is on the length direction of tube body 2, side by side between the insulation 3 of configuration, to connect, to have heat insulating ability and to allow the parts that the insulation 3 of adjacency relatively moves.

As shown in Figure 3, joint 4 is provided with inner side joint 41, outside joint 42, inner side rubber membrane 43, outside rubber membrane 44, metal tape 45 and safety cover 46.

As shown in Figure 3, inner side joint 41 is for to form circular parts, by fiber thermoinsulation material, and the parts that form such as glass wool or asbestos etc.Inner side joint 41, between the insulation 3 of adjacency, is configured in from the outer circumferential face of tube body 2 to the inner peripheral surface of outside joint 42.

Inner side joint 41 is configured to relative tube body 2 and can relatively moves at length direction (left and right directions of Fig. 3).In other words, the outer circumferential face of inner side joint 41 relative tube bodies 2, is not fixed by binder etc.

As shown in Figure 3, outside joint 42 is for to form circular parts, by rubber-like thermoinsulation material, such as formations such as the nitrile butadiene rubber foam of the foaming body of nitrile butadiene rubber or chloroprene rubbers.Outside joint 42, between the insulation 3 of adjacency, is configured in from the outer circumferential face of inner side joint 41 to shell 32, is configured to contact with the insulation 3 of adjacency.

Outside joint 42 is configured between the insulation 3 of adjacency under the state of length direction compression.Particularly, long enough is compared in the gap of the size of the length direction of outside joint 42 and the insulation of adjacency 3.Thus, can prevent from forming gap between polyurethane foam 31 and outside joint 42.Here, because outside joint 42 is to consist of the foaming body that forms spongiform nitrile butadiene rubber, thereby can by hand press compression be installed in the gap of adjacent insulation 3.

As shown in Figure 3, inner side rubber membrane 43 and outside rubber membrane 44 be for forming rubber membrane cylindraceous, by being for example included in ethylene-propylene copolymer terpolymer as the non-conjugated diene class of the 3rd composition (hereinafter referred to as " EPT ".) formation such as rubber.

Inner side rubber membrane 43 and outside rubber membrane 44 are configured to cover the outer circumferential face of outside joint 42, and the two ends of inner side rubber membrane 43 and outside rubber membrane 44 are used binder to be fixed on the shell 32 of adjacent insulation 3.

As shown in Figure 3, inner side rubber membrane 43 relatively outside rubber membrane 44 is configured in radially inner side (downside of Fig. 3), and the long of its length direction (left and right directions of Fig. 3) shortened.

Outside rubber membrane 44 relative inner rubber membranes 43 are configured in radial outside (upside of Fig. 3), and the length of its length direction is elongated.

As shown in Figure 3, metal tape 45 forms cylindric, and is configured in the outer circumferential side of outside rubber membrane 44, the end of outside rubber membrane 44 and inner side rubber membrane 43 is fixed on the shell 32 of insulation 3.The metal with rust protection and corrosion resistance of metal tape 45 preferences as stainless steel forms.

Metal tape 45 is configured in respectively the position corresponding with the two end part of length direction of outside rubber membrane 44 and the two end part of the length direction of inner side rubber membrane 43.

As shown in Figure 3, safety cover 46 is formed with for take in the accommodation space of inner side joint 41, outside joint 42, inner side rubber membrane 43, outside rubber membrane 44 and metal tape 45 in inside.

Safety cover 46 is the roughly cylinder-like part being formed by resin materials such as FRP, is provided with the blade of a sword portion extending to form diametrically at the two end part of length direction.Thus, in configuration protection cover 46, can form above-mentioned space.

One end of safety cover 46 disposes the resin strip 47 that safety cover 46 is fixed to insulation 3.Resin strip 47 is to form parts cylindraceous by resin materials such as FRP, by the end from radial outside covering protection cover 46, is secured on the shell 32 of insulation 3.

As shown in Figure 4, joining portion 5 is for to allow when relatively moving along the length direction (left and right directions of Fig. 4) between tube body 2 and insulation 3, the insulation 3 that is fixedly connected with adjacency part each other.Compare with joint 4, between the insulation 3 of adjacency, whether allow aspect relatively moving it is different.

Joining portion 5 is provided with resin strip 51 and polyethylene band 52.

As shown in Figure 4, resin strip 51 is for covering the bonding plane of the insulation 3 of adjacency, and for by resin, the parts cylindraceous that for example FRP forms, for covering insulation 3 from outer circumferential side (upside of Fig. 4).

Polyethylene band 52, for covering the bonding plane of the insulation 3 of adjacency, is the band being formed by polyethylene, and for from inner circumferential side, (downside of Fig. 4) covers insulation 3.

Secondly, the effect of the heat insulation pipe 1 with said structure is described.

In the tube body 2 of heat insulation pipe 1, flow and have LNG, as shown in Figure 1 and Figure 2, LNG makes tube body 2 cooling, and also makes insulation 3 cooling.So tube body 2 and insulation 3 are because cooling action is shunk.

Now, owing to forming the linear expansion coeffcient difference of the material of tube body 2 and insulation 3, between the contour projector of tube body 2 and the contour projector of insulation 3, produce contour projector poor.In the situation of the present embodiment, to compare with the contour projector of the length direction of tube body 2, the contraction quantitative change of insulation 3 is large.

Tube body 2 is configured to can relatively move at length direction with insulation 3, thereby the gap between the insulation 3 of the adjacency on joint 4 expands in the longitudinal direction.

So as shown in Figure 3, inner side rubber membrane 43 and outside rubber membrane 44 bonding on the shell 32 of the insulation 3 of adjacency are stretched in the longitudinal direction.Meanwhile, in this gap, carry out compressed configuration outside joint 42 corresponding gaps expansion and expand.

On the other hand, stop supplying with LNG to the tube body 2 of heat insulation pipe 1, as shown in Figure 1 and Figure 2, by the temperature of the cooling tube body 2 of LNG and insulation 3, risen.So tube body 2 and insulation 3 are along with temperature rises and expands.

Now, contrary with cooling situation, to compare with the span of the length direction of tube body 2, the span of insulation 3 diminishes.

Tube body 2 is configured to can relatively move at length direction with insulation 3, thereby shrink in the longitudinal direction in the gap between the insulation 3 of the adjacency on joint 4.

So, as shown in Figure 3, the contraction in the outside joint 42 corresponding gaps of expanding in this gap and compressed.

According to above-mentioned formation, between the insulation 3 in adjacency, from radially inner side, dispose successively toward the outer side the inner side joint 41 being formed by fiber thermoinsulation material and the outside joint 42 being formed by rubber-like thermoinsulation material, thereby compare with the situation that only configures fiber heat insulating member, can pursue the cold insulation that improves this part.And rubber-like heat insulating material has the character that hardening becomes fragile with temperature step-down, thus with along with the less fiber thermoinsulation material of temperature physical change is compared, be difficult to guarantee its stretchability.Therefore, compare with the situation that only configures rubber-like heat insulating member, can prevent from forming gap between the insulation 3 of adjacency.

Thus, can prevent from producing cold spot between the insulation 3 of adjacency.

On the other hand, in the situation that tube body 2 is different from the linear expansion coeffcient between insulation 3, when the internal flow of tube body 2 has cryogen, between the heat distortion amount of tube body 2 and the heat distortion amount of insulation 3, heat distortion amount can be produced poor.

Now, the gap between the insulation 3 of adjacency can differing from or broaden or narrow down along with above-mentioned heat distortion amount.Because inner side joint 41 is that the fiber thermoinsulation material being out of shape by easy generation forms, and outside joint 42 forms by having flexible rubber-like thermoinsulation material, thereby the expansion in the gap of corresponding configuration inner side joint 41 and outside joint 42 and dwindling, can be easy to distortion.

Therefore, owing to allowing that insulation 3 produces thermal distortions, the difference by above-mentioned heat distortion amount can relax the stress that affect insulation, and prevention insulation 3 produces breakages.Thus, can prevent the cold insulation deterioration of insulation 3.

And, owing to covering tube body 2 by individual layer insulation 3, thus with by the situation that double-deck insulation covers, compare, easily insulation 3 is installed on tube body 2.Therefore can pursue and prevent that application property from worsening.

Even if in the situation that the gap enlargement between the insulation 3 of adjacency due to outside joint 42 expansions of compressed configuration, thereby can be filled by outside joint 42 gap of above-mentioned expansion.

The explanation of reference character

1 heat insulation pipe

2 tube bodies

3 insulation

41 inner side joints

42 outside joints

Claims

1. a heat insulation pipe, is characterized in that, is provided with:

Tube body, it forms tubular and internal flow cryogen;

A plurality of insulation, it is at circumferential single this tube body that layeredly covering, and at length direction side by side and be configured to relatively described tube body and can relatively move;

Inner side joint, its radially inner side between the described insulation of adjacency, with the configuration of joining of the described insulation of adjacency, and consists of fiber thermoinsulation material, and is configured to relatively described tube body and can relatively moves in the longitudinal direction; And

Outside joint, its radial outside between the described insulation of adjacency, with the configuration of joining of the described insulation of adjacency, and consists of rubber-like thermoinsulation material,

Described outside joint under compressed state, is configured between the described insulation of adjacency on described length direction.

2. heat insulation pipe according to claim 1, is characterized in that, described outside joint is formed by the nitrile butadiene rubber foam of the foaming body of nitrile butadiene rubber or any one in chloroprene rubber.