CN108061242B - Airtight full concrete LNG holds storage tank entirely - Google Patents
Airtight full concrete LNG holds storage tank entirely Download PDFInfo
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- CN108061242B CN108061242B CN201810058715.0A CN201810058715A CN108061242B CN 108061242 B CN108061242 B CN 108061242B CN 201810058715 A CN201810058715 A CN 201810058715A CN 108061242 B CN108061242 B CN 108061242B
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- 239000004567 concrete Substances 0.000 title claims abstract description 166
- 238000003860 storage Methods 0.000 title claims abstract description 38
- 238000009413 insulation Methods 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 235000019362 perlite Nutrition 0.000 claims description 4
- 239000010451 perlite Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000011494 foam glass Substances 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000011449 brick Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 13
- 239000003949 liquefied natural gas Substances 0.000 description 29
- 230000008901 benefit Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0678—Concrete
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to an airtight full-concrete LNG full-capacity storage tank, which comprises an outer tank, a bearing platform, a dome, an inner tank and an airtight sealing system, wherein the inner tank is arranged on the outer tank; the outer tank and the inner tank are cylindrical prestressed reinforced concrete structures, the bottom end of the outer tank is fixed on a bearing platform, and a tank bottom cold insulation structure is paved on the bearing platform positioned in the outer tank; the dome is a spherical arc reinforced concrete structure and is covered on the top of the outer tank; the bottom end of the inner tank is fixed on the tank bottom cold insulation structure, and the top of the inner tank is paved with the tank top cold insulation structure; a tank wall cold insulation structure is arranged in an annular space between the inner tank and the outer tank, and an airtight sealing system is arranged in the tank wall cold insulation structure close to one side of the inner tank. The invention adopts the reinforced concrete structure which has stable structural mechanical property, low price and easy local material taking to replace X7Ni9 steel, thereby greatly improving the bearing capacity of the inner tank structure, saving a great amount of construction cost, greatly breaking through the tank capacity limit of the conventional LNG full-capacity storage tank based on the construction cost and obviously improving the unit volume operation efficiency.
Description
Technical Field
The invention relates to Liquefied Natural Gas (LNG) storage container equipment, in particular to an airtight full-concrete LNG full-capacity storage tank, and belongs to the technical field of LNG transportation and distribution
Background
LNG is clean energy which is obtained by cooling conventional natural gas to below-160 ℃ under normal pressure through a low-temperature liquefaction process and separating out sulfur, phosphorus and other pollution elements and takes methane as a main component. The LNG storage state is greatly changed under the low-temperature effect, the volume is compressed to about 1/600, and the density is about 480kg/m 3 Colorless, odorless and non-corrosive liquids. In the LNG industry, secure storage is one of the key links. The LNG full-capacity storage tank is a core storage facility in an LNG industrial chain, and has the advantages of large investment, intensive technology and high safety requirement. At present, a main body structure of a conventional LNG full-capacity storage tank consists of an outer tank and an inner tank. The outer tank is of a prestressed reinforced concrete structure, has LNG airtight and liquid-tight properties, ensures that the storage tank safely operates at low temperature and normal pressure, and controls BOG (boil off gas) loss of the storage tank within an economic and reasonable range; the inner tank is usually welded with an X7Ni9 steel plate into a flat-bottomed cylindrical structure with an open top, and is used as a main LNG-loading container. An annular space is reserved between the outer tank and the inner tank, and is filled with a cold insulation material with low heat conductivity, so that the heat exchange rate of the LNG material and the external environment is controlled. In the process of designing and building the storage tank, analysis and calculation are required according to geological conditions of a building site, so that the storage tank structure is ensured to meet the anti-seismic performance requirement under the action of high earthquake force (SSE safe stop earthquake). In particular to an inner tank structure, an X7Ni9 plate which meets the requirements of structural mechanical properties and welding technology in construction and installation is required.
The control of the inner tank wall thickness requirement in the conventional LNG full-capacity storage tank manufacturing process ensures that the tank capacity design is greatly limited, and the operation efficiency of the unit volume of the storage tank cannot be greatly improved. In addition, the high price and the large consumption of the X7Ni9 steel make the construction cost of the storage tank high, which restricts the development of the LNG industry to a certain extent.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an airtight full-concrete LNG full-capacity tank having low construction cost and high operation efficiency per unit volume.
In order to achieve the above purpose, the present invention adopts the following technical scheme: an airtight full concrete LNG full capacity storage tank, characterized in that the storage tank comprises: the concrete outer tank is of a cylindrical prestressed reinforced concrete structure, the bottom end of the concrete outer tank is fixed on a concrete bearing platform, and a tank bottom cold insulation structure is paved on the concrete bearing platform positioned in the concrete outer tank; the concrete dome is of a spherical arc reinforced concrete structure and is covered on the top of the concrete outer tank; the concrete inner tank is of a cylindrical prestressed reinforced concrete structure with an open top and a flat bottom, the bottom end of the concrete inner tank is fixed on the tank bottom cold insulation structure, and a tank top cold insulation structure is paved on the open top of the concrete inner tank; a tank wall cold insulation structure disposed within an annular space between the concrete inner tank and the concrete outer tank; an airtight sealing system disposed within the tank wall cold insulation structure proximate to one side of the concrete inner tank; the airtight sealing system is characterized in that the airtight sealing system is a net structure formed by vertical and annular pipelines which are vertically and cross-connected, the vertical and annular pipelines are communicated in a sealing mode at the cross part, a plurality of air outlets are formed in the vertical and annular pipelines towards one side of the concrete inner tank at intervals, the vertical and annular pipelines converge to a collecting pipe and then penetrate out of the concrete dome to serve as a nitrogen injection port, and nitrogen is injected into the tank wall cold insulation structure to maintain micro-positive pressure on the concrete inner tank so as to enable the outer side of the concrete inner tank to form a liquid-tight pressure balance environment.
In a preferred embodiment, a prestress system is arranged in the walls of the concrete outer tank and the concrete inner tank, the prestress system comprises a plurality of circumferential steel strands which are paved in the walls of the concrete outer tank and the concrete inner tank at intervals along the height direction, and a plurality of vertical steel strands which are paved in the walls of the concrete outer tank and the concrete inner tank at intervals along the circumferential direction, and the circumferential steel strands and the vertical steel strands adopt 1X 7 standard steel strands with the diameter of 15.7 mm.
In a preferred embodiment, the height-diameter ratio of the concrete outer tank is 0.4-0.8, the thickness of the wall body is 0.6-1.0 m, the wall body material is C40 or C50 strength grade concrete, and low temperature resistant steel bars are used on the inner side of the wall body.
In a preferred embodiment, the thickness of the wall body of the concrete inner tank is 0.4-0.8 m, the wall body material is C40 or C50 strength grade low temperature resistant concrete, and the low temperature resistant steel bars are used in the wall body concrete.
In a preferred embodiment, the concrete bearing platform is of a reinforced concrete structure, the material is C40 or C50 strength grade concrete, the thickness is 0.8-1.5 m, the bottom of the concrete bearing platform adopts a sitting-type or cast-in-place pile foundation structure, and the concrete bearing platform is fixedly connected with the bottom end of the concrete outer tank through reinforced concrete.
In a preferred embodiment, the radian of the concrete dome is 0.7-1.0 times of the inner diameter of the concrete outer tank, the concrete is C40 or C50 strength grade concrete, an H-shaped steel net shell is adopted as a supporting structure before final setting of the concrete on the inner side of the concrete dome, and the range of 8-20m of the edge annular area of the concrete dome and the wall body of the concrete outer tank are in a radial arc form of a straight line tangent dome; the center range of the inner ring of the concrete dome is circular arc, and the thickness of the central equal-thickness area is 0.3-0.6 m.
In a preferred embodiment, the vertical and annular pipelines are made of stainless steel, the distance between the vertical and annular pipelines is 0.5-2.0 m, and the distance between two adjacent air outlet holes on the vertical and annular pipelines is 0.1-0.5 m.
In a preferred embodiment, the tank bottom cold insulation structure is made of foam glass tile materials with high compressive resistance and an HLB of 600-2400 grade; the tank wall cold insulation structure comprises an elastic felt which is wrapped outside the concrete inner tank and can be ventilated, and an expanded perlite layer which is filled between the elastic felt and the concrete outer tank, and the airtight sealing system is paved in the elastic felt; the tank top cold insulation system adopts an elastic felt material with the thickness of 1.0-1.5 m after sedimentation and compression.
In a preferred embodiment, a liquid bearing system is arranged at the bottom of the concrete inner tank, the liquid bearing system is closely attached to the side wall and the bottom wall of the concrete inner tank, the height of the liquid bearing system is 5-10m, the thickness of the liquid bearing system is 1.0-2.0mm, and the liquid bearing system is made of stainless steel.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention adopts the reinforced concrete structure with stable structural mechanical property, low price and easy local material taking to replace the X7Ni9 steel material of the conventional LNG full-capacity storage tank, thereby greatly improving the bearing capacity of the inner tank structure, saving a large amount of construction cost, reducing the construction cost by more than 10 percent by comparably through comprehensive evaluation and measurement, greatly breaking through the tank capacity limit of the conventional LNG full-capacity storage tank based on the construction cost, solving the problem that the storage efficiency per unit volume of the conventional LNG full-capacity storage tank is limited because the X7Ni9 material performance of the inner tank structure can not meet the ultra-large volume design requirement, and obviously improving the unit volume operation efficiency; meanwhile, due to different influences of construction methods, the construction period can be shortened by flexibly adjusting the construction scheme. 2. The pipe network type airtight system is arranged at the outer side of the inner tank, micro positive pressure on the inner tank can be maintained by injecting nitrogen with certain pressure, so that a liquid-tight pressure balance environment is formed at the outer side of the inner tank, and the LNG liquid sealing effect is achieved. 3. The invention is provided with the cold insulation structures at the bottom of the inner tank, the annular space between the outer tank and the inner tank and at the top of the inner tank, so that the heat exchange rate of LNG in the tank and the outside can be controlled. In summary, the invention comprehensively promotes and develops the LNG full-capacity storage tank from the design concept of the process control system, the storage tank structure and the construction material, so that the LNG storage tank design and construction technology can be greatly promoted, and obvious economic benefit and social benefit can be exerted in the LNG industry development in the future.
Drawings
FIG. 1 is a schematic general construction of the present invention;
fig. 2 is an enlarged schematic view of a part of the corner point of the invention.
Reference numerals in the drawings:
1-a concrete outer tank; 2-an outer tank prestress system; 3-a tank wall cold insulation structure; 4-a tank bottom cold insulation structure; 5-a concrete bearing platform; 6-concrete dome; 7-a tank top cold insulation structure; 8-a concrete inner tank; 9-a gas-tight sealing system; 10-air outlet holes; 11-an inner tank pre-stressing system; 12-an elastic felt; 13-a liquid pressure system; 14-nitrogen injection port; 15-expanded perlite layer.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples. It is to be understood, however, that the drawings are designed solely for the purposes of providing a better understanding of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 and 2, the airtight full-concrete LNG full-capacity storage tank provided by the present invention includes a concrete outer tank 1, a concrete cap 5, a concrete dome 6, a concrete inner tank 8, and an airtight sealing system 9. The concrete outer tank 1 is of a cylindrical prestressed reinforced concrete structure, and the bottom end of the concrete outer tank 1 is fixed on a concrete bearing platform 5. The concrete dome 6 is of a spherical arc reinforced concrete structure, and the concrete dome 6 is covered on the top of the concrete outer tank 1. The tank bottom cold insulation structure 4 is paved on the concrete bearing platform 5 positioned inside the concrete outer tank 1, the concrete inner tank 8 is a cylindrical prestressed reinforced concrete structure with an open top and a flat bottom, the bottom end of the concrete inner tank 8 is fixed on the tank bottom cold insulation structure 4, and the tank top cold insulation structure 7 is paved on the open top. An annular space is left between the concrete inner tank 8 and the concrete outer tank 1, and a tank wall cold insulation structure 3 is arranged in the annular space. The airtight sealing system 9 is arranged in the tank wall cold insulation structure 3 near one side of the concrete inner tank 8, the airtight sealing system 9 is formed into a net structure by vertical and annular pipelines which are vertically and cross-connected, the vertical and annular pipelines are communicated in a closed manner at the cross part, and a plurality of air outlet holes 10 are formed in the vertical and annular pipelines at intervals towards one side of the concrete inner tank 8. All vertical and annular pipelines are converged to a collecting pipe and then penetrate out of the concrete dome 6 to serve as a nitrogen injection port 14, micro-positive pressure on the concrete inner tank 8 can be maintained by injecting nitrogen with certain pressure into the tank wall cold insulation structure 3, so that a liquid-tight pressure balance environment is formed outside the concrete inner tank 8, and the LNG liquid sealing effect is achieved.
In a preferred embodiment, an outer tank pre-stressing system 2 and an inner tank pre-stressing system 11 are respectively arranged in the walls of the concrete outer tank 1 and the concrete inner tank 8, the outer tank pre-stressing system 2 and the inner tank pre-stressing system 11 comprise a plurality of annular steel strands which are paved in the walls of the concrete outer tank 1 and the concrete inner tank 8 at intervals along the height direction, and a plurality of vertical steel strands which are paved in the walls of the concrete outer tank 1 and the concrete inner tank 8 at intervals along the circumferential direction, and the annular steel strands and the vertical steel strands adopt 1X 7 standard steel strands with the diameter of 15.7 mm. The outer tank pre-stressing system 2 and the inner tank pre-stressing system 11 can provide pre-stressing stress for the concrete outer tank 1 and the concrete inner tank 8 so as to resist damage caused by tensile stress generated by the concrete of the storage tank under the action of earthquake force.
In a preferred embodiment, the height-diameter ratio of the concrete outer tank 1 is 0.4-0.8, the thickness of the wall body is 0.6-1.0 m, the wall body material is C40 or C50 strength grade concrete, and the inner side of the wall body is provided with low temperature resistant steel bars, so that the wall body can bear the low temperature effect of minus 40 degrees and is free from cold brittle failure.
In a preferred embodiment, the wall thickness of the concrete inner tank 8 is 0.4-0.8 m, the wall material is C40 or C50 strength grade low temperature resistant concrete, and all the low temperature resistant steel bars are used in the wall concrete, so that the wall can bear the low temperature effect of minus 162 degrees and no cold brittle failure occurs.
In a preferred embodiment, the concrete bearing platform 5 is a reinforced concrete structure, the material is C40 or C50 strength grade concrete, the thickness is 0.8-1.5 m, the bottom of the concrete bearing platform 5 adopts a sitting-type or cast-in-place pile foundation structure, and the concrete bearing platform 5 is fixedly connected with the bottom end of the concrete outer tank 1 through reinforced concrete.
In a preferred embodiment, the radian of the concrete dome 6 is 0.7-1.0 times of the inner diameter of the concrete outer tank 1, the material is C40 or C50 strength grade concrete, an H-shaped steel net shell is adopted as a supporting structure before final setting of the concrete on the inner side of the concrete outer tank 1, and the range of 8-20m of the edge annular area of the concrete dome 6 and the wall body of the concrete outer tank 1 are in a straight-line dome-cutting radial arc line form so as to improve the connection tensile property of the concrete dome 6 and the concrete outer tank 1; the center range of the inner ring of the concrete dome 6 is circular arc, and the thickness of the central equal-thickness area is 0.3-0.6 m.
In a preferred embodiment, the vertical and annular pipelines are made of stainless steel, the distance between the vertical and annular pipelines is 0.5-2.0 m, and the distance between two adjacent air outlet holes 10 on the vertical and annular pipelines is 0.1-0.5 m.
In a preferred embodiment, the tank bottom cold insulation structure 5 is made of foam glass tile material with high compressive resistance, and the HLB is of the class HLB600-HLB 2400; the tank wall cold insulation structure 3 consists of a ventilated elastic felt 12 wrapped on the outer side of the concrete inner tank 8 and an expanded perlite layer 15 filled between the elastic felt 12 and the concrete outer tank 1, and the airtight sealing system 9 is paved in the elastic felt 12; the tank top cold insulation system 7 adopts an elastic felt material with the thickness of 1.0-1.5 m after sedimentation and compression.
In a preferred embodiment, a liquid bearing system 13 is arranged at the bottom of the concrete inner tank 8, the liquid bearing system 13 is closely attached to the side wall and the bottom wall of the concrete inner tank 8, the height is 5-10m, the thickness is 1.0-2.0mm, and the material is stainless steel. Because the LNG liquid static pressure at the bottom of the concrete inner tank 8 is high, and the liquid pressure bearing system 13 acts for a long time, the bottom of the concrete inner tank 8 can be more ideal in liquid tightness, and the LNG liquid is prevented from leaking at the bottom of the tank, so that the storage tank is prevented from being damaged by leakage.
The foregoing embodiments are only for illustrating the present invention, wherein the structures, connection modes, manufacturing processes, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.
Claims (7)
1. An airtight full concrete LNG full capacity storage tank, characterized in that the storage tank comprises:
the concrete outer tank is of a cylindrical prestressed reinforced concrete structure, the bottom end of the concrete outer tank is fixed on a concrete bearing platform, and a tank bottom cold insulation structure is paved on the concrete bearing platform positioned in the concrete outer tank;
the concrete dome is of a spherical arc reinforced concrete structure and is covered on the top of the concrete outer tank;
the concrete inner tank is of a cylindrical prestressed reinforced concrete structure with an open top and a flat bottom, the bottom end of the concrete inner tank is fixed on the tank bottom cold insulation structure, and a tank top cold insulation structure is paved on the open top of the concrete inner tank;
a tank wall cold insulation structure disposed within an annular space between the concrete inner tank and the concrete outer tank;
an airtight sealing system disposed within the tank wall cold insulation structure proximate to one side of the concrete inner tank;
the airtight sealing system is characterized in that the airtight sealing system is a net structure formed by vertical and annular pipelines which are vertically and cross-connected, the vertical and annular pipelines are communicated in a closed manner at a cross part, a plurality of air outlet holes are formed in the vertical and annular pipelines at intervals towards one side of the concrete inner tank, the vertical and annular pipelines are converged to a collecting pipe and then penetrate out of the concrete dome to serve as a nitrogen injection port, and nitrogen is injected into the tank wall cold insulation structure to maintain micro-positive pressure on the concrete inner tank so as to form a liquid-tight pressure balance environment outside the concrete inner tank;
the wall bodies of the concrete outer tank and the concrete inner tank are respectively provided with a pre-stress system, the pre-stress systems comprise a plurality of annular steel strands which are paved in the wall bodies of the concrete outer tank and the concrete inner tank at intervals along the height direction, and a plurality of vertical steel strands which are paved in the wall bodies of the concrete outer tank and the concrete inner tank at intervals along the circumferential direction, and the annular steel strands and the vertical steel strands adopt 1X 7 standard steel strands with the diameters of 15.7 mm;
the bottom of the concrete inner tank is provided with a liquid pressure-bearing system, the liquid pressure-bearing system is tightly attached to the side wall and the bottom wall of the concrete inner tank, the height of the liquid pressure-bearing system is 5-10m, the thickness of the liquid pressure-bearing system is 1.0-2.0mm, and the liquid pressure-bearing system is made of stainless steel.
2. The airtight full-concrete LNG full-capacity storage tank according to claim 1, wherein the height-diameter ratio of the concrete outer tank is 0.4-0.8, the thickness of the wall body is 0.6-1.0 m, the wall body material is C40 or C50 strength grade concrete, and low-temperature resistant steel bars are used on the inner side of the wall body.
3. The airtight full-concrete LNG full-capacity storage tank according to claim 1, wherein the thickness of the wall body of the concrete inner tank is 0.4-0.8 m, the wall body material is C40 or C50 strength grade low-temperature-resistant concrete, and low-temperature-resistant steel bars are used in the wall body concrete.
4. The airtight full-concrete LNG full-capacity storage tank according to claim 1, wherein the concrete bearing platform is of a reinforced concrete structure, is made of C40 or C50 strength grade concrete and has a thickness of 0.8-1.5 m, the bottom of the concrete bearing platform adopts a sitting-type or cast-in-place pile foundation structure, and the bottom of the concrete bearing platform is fixedly connected with the bottom end of the concrete outer tank through reinforced concrete.
5. The airtight full-concrete LNG full-capacity storage tank according to claim 1, wherein the radian of the concrete dome is 0.7-1.0 times the inner diameter of the concrete outer tank, the concrete is C40 or C50 strength grade concrete, an H-shaped steel net shell is adopted as a supporting structure before final setting of the concrete on the inner side of the concrete dome, and the range of 8-20m of an edge annular area of the concrete dome and a wall body of the concrete outer tank are in a straight-line dome-cutting radial arc form; the center range of the inner ring of the concrete dome is circular arc, and the thickness of the central equal-thickness area is 0.3-0.6 m.
6. The airtight full-concrete LNG full-capacity storage tank according to claim 1, wherein the vertical and annular pipelines are made of stainless steel, the distance between the vertical and annular pipelines is 0.5-2.0 m, and the distance between two adjacent air outlet holes on the vertical and annular pipelines is 0.1-0.5 m.
7. The airtight full-concrete LNG full-capacity storage tank as claimed in claim 1, wherein the tank bottom cold insulation structure is made of foam glass brick materials with high pressure resistance and an HLB600-HLB2400 grade; the tank wall cold insulation structure comprises an elastic felt which is wrapped outside the concrete inner tank and can be ventilated, and an expanded perlite layer which is filled between the elastic felt and the concrete outer tank, and the airtight sealing system is paved in the elastic felt; the tank top cold insulation system adopts an elastic felt material with the thickness of 1.0-1.5 m after sedimentation and compression.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810058715.0A CN108061242B (en) | 2018-01-22 | 2018-01-22 | Airtight full concrete LNG holds storage tank entirely |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810058715.0A CN108061242B (en) | 2018-01-22 | 2018-01-22 | Airtight full concrete LNG holds storage tank entirely |
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| CN108061242A CN108061242A (en) | 2018-05-22 |
| CN108061242B true CN108061242B (en) | 2024-01-30 |
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| CN111256026A (en) * | 2020-03-24 | 2020-06-09 | 中海石油气电集团有限责任公司 | LNG storage tank and inner tank thereof |
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