CN202171122U

CN202171122U - Double-curvature steel inner tank body and cold insulation structure of large LNG storage tank

Info

Publication number: CN202171122U
Application number: CN2011201002646U
Authority: CN
Inventors: 陈威
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-08
Filing date: 2011-04-08
Publication date: 2012-03-21
Anticipated expiration: 2021-04-08

Abstract

The utility model relates to a large LNG (Liquefied Natural Gas) storage tank, and particularly discloses a double-curvature steel inner tank body and a cold insulation structure of the large LNG storage tank, which are characterized in that the inner tank body is a double curvature housing, similar to an outer tank body in shape, and welded through low-temperature metal. The cold insulation material of the LNG tank body improves heat reflection and cold insulation, and a vault reticulated shell of the outer tank is connected with a vault of the inner tank through a thermal insulation top plate supporting rod. The double-curvature steel inner tank body and the cold insulation structure of the large LNG storage tank have the advantages of larger liquid storage capacity, stronger shake resistance and wind resistance, lower LNG evaporation rate and longer safe service life.

Description

Tank body and cold insulation structure in the double curvature steel of LNG Liquefied natural gas (LNG) large-scale storage tank

Technical field

This patent belongs to the tun technical field, specifically is the interior tank structure of double curvature steel and the cold insulation technology of LNG Liquefied natural gas (LNG) large-scale storage tank.

Background technique

LNG Liquefied natural gas (being called for short LNG) storage tank is one of critical equipment of development and use rock gas.The LNG storage tank is divided into sunken tank, half-underground storage tank, land storage tank.Be divided into single appearance formula, double volume type, hold formula, membrane type entirely by structure; Be divided into cylinder tank, spherical tank, droplet-shaped jar etc. by shape.The Large LNG tank volume has reached 25 ten thousand steres, can compile " LNG Liquefied natural gas technical manual " (China Machine Press, 2010,1) referring to Gu Anzhong.

Chinese patent 201020104065.8 discloses a kind of structure of large-sized steel welding liquid container of double curvature.For the steel low-temperature storage tank of storage LNG, the interior tank body of its double-deck tank body and cold insulation structure become the important structure factor that guarantees safety.

This patent LNG large-scale storage tank relates to Chinese patent 201020104065.8 " the steel large-scale liquid storage tank is resisted the tank structure of hurricane, tsunami ", Chinese patent 200720140652.0 " structure of large-scale liquid storage tank antidetonation tank bottom ", one Chinese patent application 200810146668.1 " large-scale liquid storage tank damping and shock insulating foundation construction method ", one Chinese patent application 200810094035.0 " large-sized rotating curved face foundation surface calibration steps ".

Summary of the invention

The utility model discloses the interior tank body of double curvature steel and the cold insulation structure of a kind of LNG Liquefied natural gas (LNG) large-scale storage tank, is applicable to Chinese patent 201020104065.8 described steel large-scale liquid storage tanks.When being used for LNG Liquefied natural gas normal pressure low pressure tank, the outer tank body of patent 201020104065.8 described storage tanks conducts, interior tank body and cold insulation structure that outer jar is increased.The interior tank body of storage tank is to use low temperature resistant-165 ℃～-170 ℃ steel plate; Low-temperature alloy steel 9Ni like nickelles stainless steel 20Mn23Al or nickelles stainless steel 15Mn26Al or nickeliferous 9%; Or Austenitic Stainless Steel OCr18Ni9Ti steel plate; Prefabricated, group is to, the double curvature hull shape metal thin shell container that is welded; Jar vault plate, interior tank shell, 3 constituent elements of interior tank bottom in interior can container is divided into; In jar vault plate strengthen with the warp-wise floor and the circumferential floor steelframe of floor assembly welding, floor steelframe and interior tank deck plate are used the inner supporting structure support reinforcing of jar in the one group of brace composition that welds between goalpost head, goalpost head and the floor steelframe on a plurality of vertical supporting post along circle distribution on the base at interior tank bottom, supporting post top in interior tank interior; Between interior jar vault plate and the outer jar vault expanded metals shell; Connect fixing with the top board strut; In jar vault plate and floor steelframe be connected with interior tank shell with jar arcuate support supports reinforcement in interior top ends of cans stiffening ring and many; Outer jar of vault plate has outer top ends of cans stiffening ring and many outer jar arcuate support supports to strengthen in the tank shell joint with the net shell outside, and interior tank shell inboard is welded with jar stiffening ring in the multiple tracks metal U-shaped; Outside in the intermediate space between tank and the interior tank, mat formation the respectively cold insulation layer material of different structure of pot bottom, jar middle part, tank top.

The shop weldering assembling of the base plate of interior tank body; Tank body base plate shop weldering assembling is outside accomplished; And the lifting, group of accomplishing most of outer tank shell be to, welding, through being up to the standards, bottom having mated formation then after the cold insulation layer; On the cold insulation layer of bottom in the beginning line, lifting, group of tank bottom to the lifting of, welding and interior tank shell, group to, weld; Outer tank shell and interior tank shell in installation, with reserving the construction passage on the position in orientation, after interior jar of vault plate and floor steelframe, supporting post supporting structure, the assembling of middle part cold insulation layer come to an end, the closure construction passage, the cold insulation layer is remaining in the middle part of accomplishing mats formation.

The inboard top of the interior tank shell of storage tank; Be provided with multiple tracks prolong circle distribution vertical, paste interior jar of bow-shaped support on the tank shell internal surface in being welded in; Interior jar of bow-shaped support upper end has vent; In jar bow-shaped support upper end with the welding of interior tank shell upper end fixing in the top ends of cans stiffening ring, welding on the interior top ends of cans stiffening ring, fixing, support in the periphery of jar vault plate and floor steelframe.

The inboard top of the outer tank shell of storage tank; Be provided with multiple tracks prolong circle distribution vertical, paste the outer jar bow-shaped support that is welded on the outer tank shell internal surface; Outer jar of bow-shaped support upper end and the fixing outer top ends of cans stiffening ring of outer tank shell upper end welding; Welding on the outer top ends of cans stiffening ring, fixing, the periphery that supports outer jar vault plate and net shell, outer jar bow-shaped support and outer top ends of cans stiffening ring use carbon steel or ordinary low-alloy steel material.

In the top board strut that is connected between jar vault plate and the outer jar of vault plate by the strut tube, regulate head, strut cylinder base, locking nut, little locking nut assemble greatly; Strut tube one end of polypropylene or polyamide system has outside thread; The other end has reverse internal thread; Its outside thread one end screws in the screw of steel strut cylinder base, on jar vault plate outer surface, screws in the left hand thread end of regulating head in the reverse screw of strut cylinder base in the strut cylinder base is weldingly fixed on; Regulating head is the rod member that respectively there are right-hand thread, left hand thread in two ends; Big locking nut and little locking nut are housed respectively on the screw thread of two ends, and the reverse screw of regulating a left hand thread and strut tube is connected, and the other end screw column of regulating head screws in the screw downward on the outer jar of net shell lower node ball under the vault plate and is connected; Rotate the wrench groove of regulating centriciput, two ends screw-in length to a degree of tightness appropriateness is regulated in adjustment, and the big locking nut at a fastening adjustment two ends and little locking nut will be regulated a two ends and fix.

The hierarchy of the interior jar of top cold insulation layer above the vault plate; Order from top to bottom is: the cotton piece of foam glass, aluminium foil, the cotton piece of foam glass, aluminium foil, the cotton piece of foam glass, aluminium foil, remaining the superiors space sprays into polyurethane foam or the glass fibre polyurethane foam is filled.

The hierarchy of middle part cold insulation layer; Arrangement from the interior tank shell outside to outer tank shell inboard; Bottom 1/3rd orders of middle part cold insulation layer full height are: the cotton piece of foam glass, aluminium foil, the cotton piece of foam glass, aluminium foil, the cotton piece of foam glass, aluminium foil; Outermost surface is mated formation and is removed the expanded perlite of steam, and compaction in layers; The order at middle part 2/3rds is on the cold insulation layer full height of middle part: the cotton piece of foam glass, the cotton piece of foam glass, outermost surface mat formation aluminium foil, blanket of glass wool spray into polyurethane foam or the glass fiber reinforced polyester foam fills up; Whenever the cotton piece of one deck foam glass of mating formation, pave one deck blanket of glass wool or polypropylene lattice or polyamide grid of average level on the cotton piece of foam glass.

Bottom cold insulation layer is accomplished after the assay was approved at the outer tank bottom of storage tank; Mat formation on the tank bottom outside; The level of hierarchy from top to bottom puts in order and is: blanket of glass wool, aluminium foil, blanket of glass wool, foam glass brick, blanket of glass wool, aluminium foil, blanket of glass wool, foam glass brick, and the expanded perlite of the dehydration gas that paves at last, the stand is compacting all; The surface centering repaves the cotton felt of glaze, aluminium foil, blanket of glass wool.

All spray into urethane foam sealing slit in the slit between the multi cellular glass fragment of brick, between the cotton piece of foam glass, between multi cellular glass fragment of brick and cotton piece of foam glass and the blanket of glass wool, between blanket of glass wool and the aluminium foil.

The advantage of invention

1. tank body can design, build more jumbo storage tank in the double curvature shell Large LNG storage tank under tank wall thickness and existing technology equipment condition that standard limits.

2. double curvature shell Large LNG storage tank under the condition of strengthening the basis, possesses the stronger ability of resisting earthquake disaster than existing cylindrical shape liquid container, ball-type liquid container droplet-shaped liquid container, can improve large-scale liquid storage tank quake-resistant safety property.

3. double curvature shell Large LNG storage tank possesses the stronger performance of resisting typhoon disaster than existing cylindrical shape liquid container, ball-type liquid container droplet-shaped liquid container, can improve the Security of large-scale storage tank wind resistance calamity.

4 double curvature shell large LNG storage tank, and an equal volume of a cylindrical tank group Liang, compared with a smaller surface area, can save consumption of steel tanks.

5. the cold insulation heat insulation layer increases road aluminium foil or heat reflection barrier, has more improved the cold insulation insulation effect.The rate of gasification that therefore can reduce LNG reduces liquefaction again, and equipment investment and cold insulation operating cost can be saved the tank plate consumption.

6. at the bottom of the spill jar of double curvature shell Large LNG storage tank avoidable " dead volume ", the raffinate allowance than flat storage tank still less in the jar during emptying LNG.

7. double curvature shell Large LNG storage tank has been avoided the edge stress peak value that the sudden change of cylindrical shape liquid storage tank skin housing radius of curvature causes, and makes STRESS VARIATION more even.Improve the safety reliability of liquid container, can prolong the safe operating life of LNG storage tank.

8. double curvature shell Large LNG storage tank is compared with the cylindrical shape liquid container with isometric(al), can reduce the steel plate consumption of tank body, and just the engineering complexity slightly increases.

9. double curvature shell Large LNG storage tank, the cylindrical shape liquid container faciation ratio with isometric(al) can reduce floor space, can reduce the construction work amount on storage tank body basis.

10. double curvature shell Large LNG storage tank technology further maximizes storage tank, has reduced the pipe network of natural air reservoir, the use amount of storage tank annex, and scale and benefit are remarkable.

Description of drawings

Fig. 1 is the right side generalized section of the double-deck steel Large LNG of double curvature storage tank.Wherein omit numerous supporting post assemblies, numerous top board strut and numerous bow-shaped supports, only showed row's supporting post. with a bow-shaped support.

Fig. 2 is that Large LNG tank bottom cold insulation layer structure formed signal.

Fig. 3 is that the layered structure of top cold insulation layer between outer jar vault and the interior jar of vault of Large LNG storage tank is illustrated.

Fig. 4 is the layered structure signal of the outer tank shell of Large LNG storage tank and the middle part cold insulation layer between the interior tank shell.Fig. 4-a is the facade section of middle and upper part cold insulation layered structure, and Fig. 4-b is the drawing in side sectional elevation of bottom cold insulation layered structure.

Fig. 5 is the structural profile signal of welding stiffening ring on the tank skin in the LNG storage tank.Show near the upper and lower air hole that all has that the stiffening ring root is among the figure.Omitted middle part cold insulation heat insulation layer in the figure.

Fig. 6 is the top cover stiffening ring of LNG reservoir walls upper end and the link node section signal of bow-shaped support and interior tank shell upper end.The type guiding principle center line position that shows the bow-shaped support upper end among the figure has groove shape vent.Figure does not draw middle part cold insulation layer and top cold insulation layer.

Fig. 7 is that outer tank deck plate is illustrated with the partial structurtes of outer tank shell connecting part, does not draw top cold insulation layer among the figure, does not also draw the top board strut.

Fig. 8 is the erection drawing signal of top board strut.The section of structure of the half side demonstration top board of figure right-of-center in political views strut.

Among the figure, parts and assembly numbering as follows in addition: 1 outer jar vault plate; 2 net shells; 3 top cold insulation layers; Jar vault plate in 4; 5 warp-wise floors; 6 circumferential floors; 7 braces; 8 goalpost heads; Jar bow-shaped support in 9; Jar stiffening ring in 10; 11 bases; Tank bottom in 12; 13 bottom cold insulation layers; 14 outer tank bottoms; 15 top board struts; 16 supporting posts; 17 middle part cold insulation layers; 18 outer tank shells; 19 blankets of glass wool; 20 expanded perlites; 21 aluminium foils; 22 foam glass bricks; Tank shell in 23; Top ends of cans stiffening ring in 24; 25 vents; 26 net shell lower node balls; 27 little locking nuts; 28 regulate head; 29 big locking nuts; 30 strut tubes; 31 strut cylinder bases; 32 floor steelframes; 33 urethane foams; The cotton piece of 34 foam glass; 35 net shell node balls; 36 outer top ends of cans stiffening rings; 37 outer jar bow-shaped supports; 38 wrench grooves.

Embodiment

Begin under the interior tank body of the LNG storage tank condition that tank bottom 14 is assembled, welded, is up to the standards outside liquid container.The construction of interior tank body and cold insulation material has most mutual concurrent job with the installation of outer tank body, intersects and carry out.

Build interior tank shell of LNG and cold insulation layer and should observe state's laws, rules and GB/T20368-2006 a series of NBS, industry standard specification such as " LNG Liquefied natural gas (LNG) are produced, stored and shipment ".LNG storage tank engineering work load is big, cross-operation is many, technical requirements is high, must strict construct by quality assurance, safety work code requirement.The per pass operation is accomplished and all pass through to check, and just carries out follow-up installment work after qualified.

The required all material of building the LNG storage tank and other parts are got all the ready by pattern,, be placed on keeping in the raw material storage through being up to the standards.

The double curvature base plate of LNG storage tank, the installation of double-curved wallboard are constructed according to the construction method of Chinese patent 201020104065.8 and Chinese patent 200720140652.0.

At the cold insulation layer 13 of the tank bottom of mating formation through outer tank bottom 14 centers that have been coated with rust proof paint that are up to the standards, according to mind-set base plate 14 peripheries from outer tank bottom 14, order from top to bottom paves.Bottom cold insulation layer 13 hierarchical sequence from top to bottom is: blanket of glass wool 19, aluminium foil 21, blanket of glass wool 19, foam glass brick 22, blanket of glass wool 19, aluminium foil 21, blanket of glass wool 19, foam glass brick 22; Repeat to pave after the pattern regulation number of plies; The expanded perlite 20 that the dehydration that on uppermost foam glass brick 22, paves outgases also shakeouts compacting, surperficial centering.Blanket of glass wool 19, aluminium foil 21, blanket of glass wool 19 above again superpose.See Fig. 2 for details.In the pavement process, spray into urethane foam 33 sealings in the slit between the foam glass brick and between outer tank bottom and the cold insulation material etc.In tank bottom cold insulation layer 13 process of mating formation, lay nitrogen purge line etc. by figure.

When the bottom cold insulation layer 13 of mating formation laid the nitrogen sparge tube road by pattern, lifting, jig group prepared also to lay the nitrogen sparge tube road by pattern therein to, the outer tank shell 18 of welding.Tank bottom 12 assemblings in preparing.After bottom cold insulation layer 13 installs, line once more on 13 layers on bottom cold insulation layer, the central position of tank bottom 12 in the centering, the steel plate of tank bottom 12 in paving, group is to, welding, check.The edge trims.To add the moulding of interior tank shell 23 of ring 24 large stretch of to having welded bow-shaped support 9, internal head cover in, the welding on the tank shell 23 for lifting, group, with the large stretch of lifting of the moulding of interior tank shell 23, jig group to, be welded to connect with interior tank bottom 12.Outer tank shell 18 will weld equally that the moulding that has been coated with rust proof paint of outer tank shell 18 of outer jar bow-shaped support 37 outer top ends of cans stiffening rings 36 is large stretch of, lifting, organize to, be welded on the outer tank bottom 14.When installing with outer tank shell 18, interior tank shell 23 keeps the construction passage with transporting material at the bottom of jar, member at same position.

The material of the middle part cold insulation layer 17 in mating formation between tank shell 23 and the outer tank shell 18.Outside interior tank shell 23 to outside tank shell 18 with interior arrangement level; In bottom 1/3rd scopes of middle part cold insulation layer 17 full height, cold insulation material is arranged hierarchical sequence and is: the cotton piece 34 of foam glass, aluminium foil 21, the cotton piece 34 of foam glass, aluminium foil 21 ... To the pattern regulation number of plies.Outermost surface near outer tank shell is loaded the expanded perlite that removes steam, and compaction in layers.See Fig. 4-b.Spray into the polyurethane foam sealing in the slit between glass wool piece 34 and the aluminium foil 21.

In the scope of the middle and upper part 2/3rds of middle part cold insulation layer 17; Cold insulation material is arranged hierarchical sequence: the cotton piece 34 of foam glass, the cotton piece 34...... of foam glass mat formation to the pattern regulation number of plies, are aluminium foil 21, polyurethane foam or glass wool 19 polyurethane foams 33 near the outermost surface of outer tank shell.On the cotton piece 34 of the foam glass of each flat bed, level pave layer of glass felt or polypropylene lattice or polyamide grid.See Fig. 4-a.Cotton piece 34 of slit, foam glass between cotton piece 34 of foam glass and the cotton piece 34 of foam glass and the slit between blanket of glass wool 19 or polypropylene lattice or the polyamide grid all spray into polyurethane foam sealing slit.

In tank body middle part cold insulation layer 17 material of mating formation, the prefabricated sheet of warp-wise floor 5 that will be prefabricated on interior tank bottom 12, the floor steelframe 32 of circumferential floor 6 welding is assembled at the scene, lifts on the internal head cover stiffening ring 24 on the interior tank shell 23.Tank diameter hour can use floor steelframe 32 integral lifting to install.

After floor steelframe 32 assembling is in place, base 11, supporting post 16, goalpost 8, brace 7 are rule, installed, are welded in place.Jar vault plate 4 on floor steelframe 32, paving, weld, interior jar of vault plate 4 welded are strengthened on 24 at the internal head cover at interior tank shell top.

On interior jar of vault plate 4, the net shell 2 of the outer jar vault of assembling.Welding is fixed on the outer jar of stiffening ring 36 on the outer tank shell around the net shell 2.

After the skeleton of jar net shell 2 installs and fixes outside, connect the lower node ball and the interior tank deck plate arch top board 4 of fixing outer tank top net shell 2 skeletons with the top board strut 15 of adjustable length.With regulating the screw that 28 a upper end screw thread is screwed into the lower node ball lower end of net shell 2 skeletons, regulate a other end and be screwed in the left hand thread hole of strut tube 30, in the cooperation screw of the strut cylinder base 31 in the other end of strut tube 30 is screwed into and is welded on jar vault plate 4.When top board strut 15 is installed, clamp a wrench groove of regulating on 28 with wrench and rotate and regulate a length of 28 adjustment top board struts 15, the big locking nut 29 on the fastening adjustment 28, fastening little locking nut 27.See Fig. 8.

The top cold insulation layer 3 of mating formation subsequently.Cold insulation material ordering from top to bottom between outer jar vault plate 1 and the interior jar vault plate 4 is: the cotton piece 34 of foam glass, aluminium foil 21, the cotton piece 34 of foam glass, aluminium foil 21 ... Repeat to nappe to the regulation number of plies.The foam glass at top board strut 15 places cotton 34 is mated formation after holing, cut with aluminium foil 21, dodges top board strut 15.Slit between the cotton piece 34 of foam glass between foam glass cotton 34 and the top board strut 15 sprays into the foamed polyurethane sealing.

After the cotton piece 34 of foam glass below jar vault plate is mated formation outside, in remaining upper space, spray polyurethane foam or glass fibre polyurethane foam.

In Large LNG storage tank installation process, according to the supply pipe of pattern installation storage tank, discharge nozzle, boil-off gas import, boil-off gas outlet, emptying bursting tube, safety valve conduit, vacuum valve adapter etc., and static is derived, electrochemical protection device lead-in wire is taken over.

Press pattern the opening-nozzle of LNG storage tank instrument and apparatus is installed; For example: level gauging transmitter, thermometry transmitter, density measure transmitter, absolute pressure transducer, manometer pressure transmitter, pipeline differential pressure transmitter, interior jar and opening-nozzles such as annular space differential pressure transmitter, gas-phase space resistance temperature detector, top resistance temperature detector, cooling or leakage monitoring temperature.

Installation is mainly used in the perforate pipeline of the LNG storage tank of test run and special operational use; Take over, for example: spraying cooling, pressure of foundation balance sysmte return line, tank bottom nitrogen purge line, middle part nitrogen purge line, the perforate of outer jar vault, the perforate of interior jar vault, manhole, hand hole or the like.

The construction passage of LNG storage tank gets at material, after installation, construction equipment are withdrawn the scene, and sealing immediately, and qualified through flaw detection.At last.The outer winding staircase of LNG storage tank etc. is installed, is coated with outer thermal insulation coatings, clean tank interior, carry out hydrostatics testing.

Claims

1. tank body and cold insulation structure in the double curvature steel of a LNG Liquefied natural gas (LNG) large-scale storage tank; The interior tank body of storage tank is to use low temperature resistant-165 ℃～-170 ℃ steel plate; Low-temperature alloy steel 9Ni like nickelles stainless steel 20Mn23Al or nickelles stainless steel 15Mn26Al or nickeliferous 9%; Or Austenitic Stainless Steel OCr18Ni9Ti steel plate; Prefabricated, group is to, the double curvature hull shape metal thin shell container that is welded; Jar vault plate, interior tank shell, 3 constituent elements of interior tank bottom in interior can container is divided into; In jar vault plate strengthen with the warp-wise floor and the circumferential floor steelframe of floor assembly welding, floor steelframe and interior tank deck plate are used the inner supporting structure support reinforcing of jar in the one group of brace composition that welds between goalpost head, goalpost head and the floor steelframe on a plurality of vertical supporting post along circle distribution on the base at interior tank bottom, supporting post top in interior tank interior; Between interior jar vault plate and the outer jar vault expanded metals shell; Connect fixing with the top board strut; In jar vault plate and floor steelframe be connected with interior tank shell with jar arcuate support supports reinforcement in interior top ends of cans stiffening ring and many; Outer jar of vault plate has outer top ends of cans stiffening ring and many outer jar arcuate support supports to strengthen in the tank shell joint with the net shell outside, and interior tank shell inboard is welded with jar stiffening ring in the multiple tracks metal U-shaped; Outside in the intermediate space between tank and the interior tank, mat formation the respectively cold insulation layer material of different structure of pot bottom, jar middle part, tank top.

2. based on claim 1 described LNG large-scale storage tank body and cold insulation structure, it is characterized in that the shop weldering assembling of the base plate of interior tank body; Tank body base plate shop weldering assembling is outside accomplished; And the lifting, group of accomplishing most of outer tank shell be to, welding, through being up to the standards, bottom having mated formation then after the cold insulation layer; On the cold insulation layer of bottom in the beginning line, lifting, group of tank bottom to the lifting of, welding and interior tank shell, group to, weld; Outer tank shell and interior tank shell in installation, with reserving the construction passage on the position in orientation, after interior jar of vault plate and floor steelframe, support column supporting construction, the assembling of middle part cold insulation layer come to an end, the closure construction passage, the cold insulation layer is remaining in the middle part of accomplishing mats formation.

3. the interior tank body of LNG large-scale storage tank according to claim 1 and cold insulation structure; It is characterized in that; The inboard top of the interior tank shell of storage tank, be provided with multiple tracks prolong circle distribution vertical, paste interior jar of bow-shaped support on the tank shell internal surface in being welded in, interior jar of bow-shaped support upper end has vent; In jar bow-shaped support upper end with the welding of interior tank shell upper end fixing in the top ends of cans stiffening ring, welding on the interior top ends of cans stiffening ring, fixing, support in the periphery of jar vault plate and floor steelframe.

4. the interior tank body of LNG large-scale storage tank according to claim 1 and cold insulation structure; It is characterized in that; The inboard top of the outer tank shell of storage tank; Be provided with multiple tracks prolong circle distribution vertical, paste the outer jar bow-shaped support that is welded on the outer tank shell internal surface; Outer jar of bow-shaped support upper end and the fixing outer top ends of cans stiffening ring of outer tank shell upper end welding, welding on the outer top ends of cans stiffening ring, fixing, the periphery, outer jar bow-shaped support and outer top ends of cans stiffening ring use carbon steel or the ordinary low-alloy steel material that support outer jar vault plate and net shell.

5. based on the interior tank body and the cold insulation structure of the described LNG large-scale storage tank of claim 1; It is characterized in that interior jar of vault plate assembled by strut tube, adjusting head, strut cylinder base, big locking nut, little locking nut with the top board strut that is connected between jar vault plate outward; Strut tube one end of polypropylene or polyamide system has external screw thread; The other end has reverse internal thread; Its external screw thread one end screws in the screw of steel strut cylinder base, on jar vault plate outer surface, screws in the left-hand thread end of regulating head in the reverse screw of strut cylinder base in the strut cylinder base is weldingly fixed on; Regulating head is the rod member that respectively there are right-hand thread, left-hand thread in two ends; Big locking nut and little locking nut are housed respectively on the screw thread of two ends, and the reverse screw of regulating a left-hand thread and strut tube is connected, and the other end threaded column of regulating head screws in the screw downward on the outer jar of net shell lower node ball under the vault plate and is connected; Rotate the wrench groove of regulating centriciput, two ends screw-in length to a degree of tightness appropriateness is regulated in adjustment, and the big locking nut at a fastening adjustment two ends and little locking nut will be regulated a two ends and fix.

6. the interior tank body of LNG large-scale storage tank according to claim 1 and cold insulation structure; It is characterized in that; The hierarchy of the interior jar of top cold insulation layer above the vault plate; Order from top to bottom is: the cotton piece of foam glass, aluminium foil, the cotton piece of foam glass, aluminium foil, the cotton piece of foam glass, aluminium foil, remaining the superiors space sprays into polyurethane foam or the glass fibre polyurethane foam is filled.

7. the interior tank body of LNG large-scale storage tank according to claim 1 and cold insulation structure; It is characterized in that; The hierarchy of middle part cold insulation layer, to the inboard arrangement of outer tank shell, bottom 1/3rd orders of middle part cold insulation layer full height are from the interior tank shell outside: the cotton piece of foam glass, aluminium foil, the cotton piece of foam glass, aluminium foil, the cotton piece of foam glass, aluminium foil; Outermost surface is mated formation and is removed the expanded perlite of steam, and compaction in layers; The order at middle part 2/3rds is on the cold insulation layer full height of middle part: the cotton piece of foam glass, the cotton piece of foam glass, outermost surface mat formation aluminium foil, blanket of glass wool spray into polyurethane foam or the glass fiber reinforced polyester foam fills up; Whenever the cotton piece of one deck foam glass of mating formation, pave one deck blanket of glass wool or polypropylene lattice or polyamide grid of average level on the cotton piece of foam glass.

8. the interior tank body of LNG large-scale storage tank according to claim 1 and cold insulation structure; It is characterized in that; Bottom cold insulation layer is accomplished after the assay was approved at the outer tank bottom of storage tank, mats formation on the tank bottom outside, and the level of hierarchy from top to bottom puts in order and is: blanket of glass wool, aluminium foil, blanket of glass wool, foam glass brick, blanket of glass wool, aluminium foil, blanket of glass wool, foam glass brick; Pave at last the dehydration gas expanded perlite; The stand is compacting all, and surperficial centering repaves the cotton felt of glaze, aluminium foil, blanket of glass wool.

9. the interior tank body of LNG large-scale storage tank according to claim 1 and cold insulation structure; It is characterized in that, all spray into urethane foam sealing slit in the slit between the multi cellular glass fragment of brick, between the cotton piece of foam glass, between multi cellular glass fragment of brick and cotton piece of foam glass and the blanket of glass wool, between blanket of glass wool and the aluminium foil.