CN102428310A

CN102428310A - Heat insulation pipe

Info

Publication number: CN102428310A
Application number: CN2010800211784A
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: 2012-04-25
Anticipated expiration: 2030-11-18
Also published as: CN102428310B; KR20120021306A; KR101356316B1; JP2011106648A; JP5448743B2; WO2011062237A1

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

Adiabatic pipe arrangement

Technical field

The present invention relates to be suitable for delivering cryogenic fluid, particularly LNG Liquefied natural gas (below be called " LNG ".) adiabatic pipe arrangement.

Background technique

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

In general, compare with the material (for example, stainless steel) of the tube body that constitutes pipe arrangement as the polyurethane of heat insulating member, its linear expansion coeffcient is bigger.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, generally adopt the thermoinsulation material that polyurethane is constituted to be divided into internal side diameter and outside diameter and make between the heat insulating member in thermoinsulation material and the outside of inboard non-bonding and allow the structure that the two relatively moves.

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

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

Adopting the 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, therefore is difficult to cover pipe arrangement integral body with single heat insulating member.

For relaxing this stress, cut off heat insulating member with predetermined distance, 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 is provided with joint.

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

The existing technology document

Special permission document 1: real the opening of Japan put down the 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 exist setting to have the pipe arrangement of this structure in the double layer construction of internal side diameter and outside diameter and becomes big problem.

Under the situation of the LNG equipment that is used for the LNG ship, when the pipe arrangement on the aged ship that increases will more renew pipe arrangement from now on, just the problem of constructional difficulties has appearred particularly.

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

Yet; Owing to adopt the insulation material layer that the hard polyurethane foams foamed solidification is formed to come the heat insulating member of bonding adjacency; Thereby gap flexible insufficient that can cause the heat insulating member of adjacency, the inadequate problem of mitigation of the stress that produces with regard to the inside that occurs polyurethane thus.

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 clog herein under the situation of glass wool, glass wool is compared with polyurethane; Its cold insulation property is lower, thereby just the problem of cold spot occurs producing.

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

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

The technological scheme that is used for the technical solution problem

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

The present invention provides a kind of adiabatic pipe arrangement, 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 disposes side by side at length direction; The configuration of joining of inboard joint, the said insulation of its radially inner side and adjacency between the said insulation of adjacency, and constitute by the fiber heat insulating member; And outside joint, the configuration of joining of the said insulation of its radial outside and adjacency between the insulation of adjacency, and constitute by the rubber-like heat insulating member.

According to the present invention; Between the insulation of adjacency; Dispose inboard joint that constitutes by the fiber thermoinsulation material and the outside joint that constitutes by the rubber-like thermoinsulation material toward the outer side successively from radially inner side; Therefore compare with the situation that only disposes the fiber thermoinsulation material, can pursue the cold insulation property that improves this part.

On the other hand, under the linear expansion coeffcient condition of different between tube body and the insulation, when the internal flow cryogen of tube body, it is poor to produce heat distortion amount between the heat distortion amount of tube body and the heat distortion amount of insulation.

At this moment, the gap between the insulation of adjacency can differing from or broaden or narrow down along with above-mentioned heat distortion amount.Because inboard joint is the fiber thermoinsulation material that be prone to produce distortion, and outside joint is a rubber-like rubber-like thermoinsulation material, thereby the expansion in the gap of corresponding inboard joint of configuration and outside joint and dwindling, can be easy to distortion.

Therefore, produce thermal distortion owing to allow insulation, the difference through above-mentioned heat distortion amount can relax the stress that influence insulation, and the prevention insulation produces breakage.

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

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

According to the present invention, even under the situation of 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 adiabatic pipe arrangement of the present invention; Between the insulation of adjacency, dispose inboard joint that constitutes by the adiabatic material of fiber and the outside joint that constitutes by the adiabatic material of rubber-like toward the outer side successively, therefore can play to pursue preventing deterioration of cold insulation property and the effect that prevents to produce cold spot from radially inner side.

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

Description of drawings

Fig. 1 is the ideograph that is used to explain the structure of the adiabatic pipe arrangement that relates to the first embodiment of the present invention.

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

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

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

Embodiment

Relate to first embodiment's of this invention adiabatic pipe arrangement with reference to Fig. 1～Fig. 4 explanation below.

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

In the present embodiment, to the adiabatic pipe arrangement 1 of the conveying that is used for LNG in the LNG equipment the present invention is described.LNG is meant the rock gas fluid of liquefaction, and temperature is approximately-162 ℃ cryogenic liquide.

In addition; Fluid in the internal flow of adiabatic pipe arrangement 1 can be above-mentioned LNG, and also can be needs other cryogens of keeping low-temperature condition to carry, for example; Need to reduce the gasification ratio that causes by intrusion thermal conductance, the fluid of keeping sufficient liquid, not special the qualification from the outside.

Like Fig. 1 and shown in Figure 2, adiabatic pipe arrangement 1 is provided with tube body 2, insulation 3, joint 4 and joining portion 5.

Like Fig. 1 and shown in Figure 2, tube body 2 is inner cylinder-like part with stream that LNG flows, for example, and the parts that form by stainless steel and other metal materials.

The two ends of tube body 2 are provided with the flange 21 of the tube body 2 that is used to connect adjacency.

Insulation 3 is used to suppress to enter into from the outside heat of the LNG of the inside that flows in tube body 2 for the parts that cover into tubular around the tube body 2.

Insulation 3 is provided with foaming body polyurethane foam 31 that constitutes and the shell 32 that is formed by FRP (FRP) by polyurethane resin.

Polyurethane foam 31 is the heat insulating members that are used to suppress from the outside the heat of the LNG of the inside that flows in tube body 2, is used for the outer surface of tube body 2 is covered into tubular.

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

As polyurethane foam 31, preferably use density to be about 40kg/m ³About material.

On the other hand, the material as constituting polyurethane foam 31 can use well known materials such as polystyrene foam, polyethylene or phenol formaldehyde foam, not special the qualification.

Shell 32 is the cylinder-like part of the outer circumferential face that is used to cover polyurethane foam 31, and is used to protect polyurethane foam 31.

The terminal part of shell 32, in other words, the portion that closely is 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 with side by side connecting, have heat insulating ability between the insulation 3 of configuration on the length direction of tube body 2 and allowing the parts that the insulation 3 of adjacency relatively moves.

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

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

Inboard 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 inboard joint 41 relative tube bodies 2 is not fixed through binder etc.

As shown in Figure 3, outside joint 42 is for to form circular parts, by the rubber-like thermoinsulation material, and formations such as the nitrile butadiene rubber foam of the foaming body of nitrile butadiene rubber or chloroprene rubber for example.Outside joint 42 is configured in outer circumferential face from inboard joint 41 to the shell 32 between the insulation 3 of adjacency, be 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, the size of the length direction of outside joint 42 is compared long enough with the gap of the insulation 3 of adjacency.Thus, can prevent to form the gap between polyurethane foam 31 and the outside joint 42.Here, because outside joint 42 is to be made up of the foaming body that forms spongiform nitrile butadiene rubber, thereby can pushes compression through hand and be installed in the gap of adjacent insulation 3.

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

Inboard 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 inboard rubber membrane 43 and outside rubber membrane 44 use adhesive securement to the shell 32 of adjacent insulation 3.

As shown in Figure 3, inboard rubber membrane 43 outside rubber membrane 44 relatively 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, and the end of outside rubber membrane 44 and inboard 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 constitutes.

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

As shown in Figure 3, safety cover 46 is formed with the accommodation space that is used for taking in inside inboard joint 41, outside joint 42, inboard rubber membrane 43, outside rubber membrane 44 and metal tape 45.

Safety cover 46 is the roughly cylinder-like part that is formed by resin materials such as FRP, is provided with the blade of a sword portion that extends 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 with forming parts cylindraceous by resin materials such as FRP, through 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 fixedly connected insulation 3 part each other of adjacency for to allow along the length direction (left and right directions of Fig. 4) between tube body 2 and the insulation 3 when relatively moving.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 used to cover the bonding plane of the insulation 3 of adjacency, and for by resin, for example the parts cylindraceous that form of FRP are used for covering insulation 3 from outer circumferential side (upside of Fig. 4).

Polyethylene band 52 is used to cover the bonding plane of the insulation 3 of adjacency, is the band that is formed by polyethylene, and is used for covering insulation 3 from interior all sides (downside of Fig. 4).

Secondly, the effect of the adiabatic pipe arrangement 1 with said structure is described.

Flowing in the tube body 2 of adiabatic pipe arrangement 1 has LNG, and like Fig. 1 and shown in Figure 2, LNG makes tube body 2 coolings, and also makes insulation 3 coolings.So tube body 2 and insulation 3 are owing to cooling action is shunk.

At this moment, owing to constitute the linear expansion coeffcient difference of the material of tube body 2 and insulation 3, it is poor to produce contour projector between the contour projector of the contour projector of tube body 2 and insulation 3.In the situation of present embodiment, to compare with the contour projector of the length direction of tube body 2, the contraction quantitative change of insulation 3 is big.

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 the joint 4 enlarges in the longitudinal direction.

So as shown in Figure 3, inboard 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, carry out in this gap compressed configuration outside joint 42 corresponding gaps expansion and expand.

On the other hand, stop to supply with LNG,, rise by the tube body 2 of LNG cooling and the temperature of insulation 3 like Fig. 1 and shown in Figure 2 to the tube body 2 of adiabatic pipe arrangement 1.So tube body 2 and insulation 3 rise along with temperature and expand.

At this moment, opposite with the situation of cooling, 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 the joint 4.

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

According to above-mentioned formation; Because between the insulation 3 of adjacency; Dispose inboard joint 41 that constitutes by the fiber thermoinsulation material and the outside joint 42 that constitutes by the rubber-like thermoinsulation material toward the outer side successively from radially inner side; Thereby compare with the situation that only disposes the fiber heat insulating member, can pursue the cold insulation property that improves this part.And the adiabatic material of rubber-like has the character that hardening becomes fragile with the 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, can prevent to form the gap between the insulation 3 of adjacency with the situation that only disposes the rubber-like heat insulating member.

Thus, can prevent to produce cold spot between the insulation 3 of adjacency.

On the other hand, under the linear expansion coeffcient condition of different between tube body 2 and the insulation 3, when the internal flow of tube body 2 has cryogen, it is poor to produce heat distortion amount between the heat distortion amount of the heat distortion amount of tube body 2 and insulation 3.

At this moment, the gap between the insulation 3 of adjacency can differing from or broaden or narrow down along with above-mentioned heat distortion amount.Because inboard joint 41 is to constitute by being prone to produce the fiber thermoinsulation material that is out of shape; And outside joint 42 is made up of rubber-like rubber-like thermoinsulation material; Thereby the expansion in the gap of corresponding inboard joint 41 of configuration and outside joint 42 and dwindling, can be easy to distortion.

Therefore, produce thermal distortions owing to allow insulation 3, the difference through above-mentioned heat distortion amount can relax the stress that influence insulation, and prevention insulation 3 produces breakages.Thus, can prevent the cold insulation property deterioration of insulation 3.

And, owing to use individual layer insulation 3 to cover tube body 2, thereby compare with the situation of using double-deck insulation to cover, be prone to insulation 3 is installed on the tube body 2.Therefore can pursue and prevent that application property from worsening.

Even under the situation of the gap enlargement between the insulation 3 of adjacency, because outside joint 42 expansions of compressed configuration, thereby can be through the gap of the above-mentioned expansion of outside joint 42 fillings.

The explanation of reference character

1 adiabatic pipe arrangement

2 tube bodies

3 insulation

41 inboard joints

42 outside joints

Claims

1. an adiabatic pipe arrangement is characterized in that, is provided with:

Tube body, it forms tubular and internal flow cryogen;

A plurality of insulation, it layeredly covers this tube body circumferentially single, and disposes side by side at length direction;

Inboard joint, its radially inner side between the said insulation of adjacency with the configuration of joining of the said insulation of adjacency, and is made up of the fiber thermoinsulation material; And

Outside joint, its radial outside between the said insulation of adjacency with the configuration of joining of the said insulation of adjacency, and is made up of the rubber-like thermoinsulation material.

2. adiabatic pipe arrangement according to claim 1 is characterized in that, said outside joint is configured between the said insulation of adjacency towards the compressed state of said length direction.