CN204226958U

CN204226958U - Lng vacuum tube

Info

Publication number: CN204226958U
Application number: CN201420353518.9U
Authority: CN
Inventors: 傅斌; 冉鹏; 刘伟
Original assignee: CHONGQING JUCHUANG METERING EQUIPMENT CO LTD
Current assignee: CHONGQING JUCHUANG METERING EQUIPMENT CO LTD
Priority date: 2014-06-28
Filing date: 2014-06-28
Publication date: 2015-03-25
Anticipated expiration: 2024-06-28

Abstract

The utility model relates to LNG loading technique field, specifically disclose a kind of LNG vacuum tube, comprise inner and outer tubes, described inner and outer tubes are arranged with one heart, be vacuum state between described inner and outer tubes, and be provided with heat insulation layer and radiation protective layer between described inner and outer tubes.The utility model advantage is, owing to arranging heat insulation layer and anti-radiation protective layer between the inner and outer pipe sections, and keep vacuum state between inner and outer tubes, thus effectively intercepted heat transfer, thermoconvection and thermal-radiating effect, evaporation loss out-of-date for cryogenic liquid stream is controlled within minimum zone.Meanwhile, corrugated expansion joint is set between the inner and outer pipe sections, effectively compensates the internal tube shrinks size that vacuum pipe produces when cryogenic liquide flows.

Description

LNG vacuum tube

Technical field

The utility model relates to LNG loading technique field, refers to a kind of LNG vacuum tube especially.

Background technique

In recent years, the development of using along with domestic LNG, LNG applied to automobile filling in a large number as a kind of novel clean energy resource, and city is civilian, gas peak regulation, peak regulation of power plant, and the field such as other industrial gas.And as being exclusively used in the skid-mounted device of LNG automobile filling station, LNG pipeline is then responsible for the function of transportation of liquefied natural gas, in the design of LNG Liquefied natural gas delivery line, the cold insulation mode of pipeline is then a very important problem.

At present; apply to the structure of LNG pipeline cold insulation generally by heat insulation layer; vapor barrier and protective layer are formed; because the tubing of conveying Huaihe River gas pipeline is Austenitic Stainless Steel; according to the regulation of " code for construction and acceptance of heat insulation in industrial equipment and pipe work " (GBJ126), the chloride content of thermoinsulation material should be less than 25 × 10-6.And common cryogenic piping low temperature cold insulation material has multi cellular glass, phenol formaldehyde foam, deep cold type three TI, rigid polyurethane ester foamed plastic (PUR), modified polyurethane rigid foam plastics (PUH, PUB), but below foam at the scene and overall cold insulation effect all has some limitations, for subzero 162 degree of LNG liquid, according to foam-in-place technique and construction quality, it directly has influence on the cold insulation effect of later stage conduit running, therefore, based on this, the present invention adopts a kind of cold insulation mode applying to high vacuum pipe on LNG sledge dress filling station, to whole sledge dress valve, pipeline all adopts the vacuum pipe of standard paragraphs, according to skid body pipeline technology coupling vacuum pipe cold insulation, compare foam-in-place technique, namely seem attractive in appearance, serve again real cold insulation effect.

Model utility content

The purpose of this utility model is to provide a kind of LNG vacuum tube, and it has intercepted heat transfer, thermoconvection and thermal-radiating effect effectively, evaporation loss out-of-date for cryogenic liquid stream is controlled within minimum zone, high insulating effect.

To achieve these goals, the utility model have employed following technological scheme: a kind of LNG vacuum tube, comprises inner and outer tubes, and described inner and outer tubes are arranged with one heart, be vacuum state between described inner and outer tubes, and be provided with heat insulation layer and radiation protective layer between described inner and outer tubes.

Preferably, corrugated expansion joint is provided with between described inner and outer tubes.

Preferably, described outer tube and interior pipe are Stainless Steel Tube.

Further, described heat insulation layer is three TI layers.

Further, described radiation protective layer is aluminium foil layer.

Further, the vacuum pressure between described inner and outer tubes is≤2 × 10 ^-4torr.

The beneficial effects of the utility model are: after adopting said structure, owing to arranging heat insulation layer and anti-radiation protective layer between the inner and outer pipe sections, and keep vacuum state between inner and outer tubes, thus effectively intercepted heat transfer, thermoconvection and thermal-radiating effect, evaporation loss out-of-date for cryogenic liquid stream is controlled within minimum zone.Meanwhile, corrugated expansion joint is set between the inner and outer pipe sections, effectively compensates the internal tube shrinks size that vacuum pipe produces when cryogenic liquide flows.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment technological scheme, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only that the utility model is in order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, below the accompanying drawing used required in p-embodiment or description of the prior art is briefly described, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is structural representation of the present utility model.

In figure, 1, interior pipe, 2, outer tube, 3, heat insulation layer, 4, radiation protective layer.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technological scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

A kind of LNG vacuum tube as shown in Figure 1, comprise interior pipe 1 and outer tube 2, described outer tube 2 and interior pipe 1 are Stainless Steel Tube, and described interior pipe 1 and outer tube 2 are arranged with one heart, be vacuum state between described interior pipe 1 and outer tube 2, the vacuum pressure between described interior pipe 1 and outer tube 2 is≤2 × 10 ^-4torr.And be provided with heat insulation layer 3 and radiation protective layer 4 between described interior pipe 1 and outer tube 2, thus effectively intercepted heat transfer, thermoconvection and thermal-radiating effect, evaporation loss out-of-date for cryogenic liquid stream is controlled within minimum zone.

Wherein, corrugated expansion joint is provided with between described interior pipe 1 and outer tube 2.Effectively compensate vacuum pipe produce when cryogenic liquide flows in pipe 1 shrink size.

Further, described heat insulation layer 3 is three TI layers, and described radiation protective layer 4 is aluminium foil layer.

In conventional on-site foaming, its technique adopts three layers of canoe, first layer vapor barrier, second layer Cold-keeping Layer, third layer protective layer.Adopt these three kinds of mode first requirements will reach the requirement of conduit operating temperature cold insulation on the thickness of Cold-keeping Layer.Second requires that outer protective layer needs strictly sealing, in case the sky and water of raining are infiltrated destroy middle Cold-keeping Layer.And often in practice of construction its thickness and protective layer all do not reach required standard and cause cold insulation effect after whole conduit running a period of time to lose efficacy.Vacuum pipe mode is adopted then can farthest to overcome the above problems.Straight pipeline adopts meeting sealing means, and this employing seamless link of two segment pipes, can make whole pipeline vacuum leak-down rate≤2 × 10-10PaL/s; The mode that its mouth of pipe of vacuum adopts double-layer vacuum to cover.The average refrigerating loss amount≤0.5W/M of pipeline can be reached.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims

1. a LNG vacuum tube, it is characterized in that, comprise interior pipe (1) and outer tube (2), described interior pipe (1) and outer tube (2) are arranged with one heart, be vacuum state between described interior pipe (1) and outer tube (2), and between described interior pipe (1) and outer tube (2), be provided with heat insulation layer (3), radiation protective layer (4) and corrugated expansion joint.

2. LNG vacuum tube according to claim 1, is characterized in that: described outer tube (2) and interior pipe (1) are Stainless Steel Tube.

3. LNG vacuum tube according to claim 1 and 2, is characterized in that: described heat insulation layer (3) is three TI layers.

4. LNG vacuum tube according to claim 1 and 2, is characterized in that: described radiation protective layer (4) is aluminium foil layer.

5. LNG vacuum tube according to claim 1 and 2, is characterized in that: the vacuum pressure between described interior pipe (1) and outer tube (2) is≤2 × 10 ^-4torr.