B-type liquefied gas storage tank

Abstract

The invention discloses a B-type liquefied gas storage tank which comprises a tank body shell, a tank body internal structure, a heat insulation layer and a tank bottom supporting mechanism. The tank body shell is in a cylindrical barrel shape. The internal structure of the tank body comprises two middle reinforcing frames, a plurality of vertical reinforcements, a plurality of horizontal strong and weak structure rings, a tank top reinforcing structure and a tank bottom reinforcing structure. The two middle reinforcing frames are located on the transverse center line and the longitudinal center line of the storage tank cavity in a one-to-one correspondence mode. A plurality of vertical strong structures are uniformly distributed and fixed on the inner wall surface of the side part of the tank body shell; a plurality of horizontal strong and weak structure ring edges are fixed on the inner wall surface of the side part of the tank body shell at intervals; the tank top reinforcing structure comprises a top inner annular reinforcing structure, a top outer annular reinforcing structure and a plurality of top radial reinforcing structures; the tank bottom reinforcing structure comprises a bottom inner annular reinforcing structure, a bottom outer annular reinforcing structure and a plurality of bottom radial reinforcing structures; the heat insulation layer covers the outer surface of the tank body shell; the tank bottom supporting mechanism comprises a bottom anti-swing / anti-tilting support and a plurality of bottom supporting seats. The device has the characteristics of being uniform in stress, easy to process and low in cost.

Description

Technical Field

[0001] The present invention relates to a type B liquefied gas storage tank. Background Art

[0002] Type B liquid cargo tanks are generally in a planar structure form (prismatic), or a rotary spherical type (MOSS type), with the latter being dominated by a Japanese company. The prismatic type B liquid cargo tank has been applied in container ships as an LNG fuel tank in China, or in VLEC (Very Large Ethane Carrier) as a liquid cargo tank.

[0003] The MOSS type B liquid cargo tank is welded with ultra-thick aluminum alloy, with a large overall weight, and high requirements for welding technology and environment. Few shipyards in China can master this technology.

[0004] When manufacturing a prismatic type B liquid cargo tank, the manufacturing process requirements are relatively high, especially for the manufacturing of the corners (spherical heads), and it is prone to deformation. Summary of the Invention

[0005] The purpose of the present invention is to provide a type B liquefied gas storage tank to fill the gaps in the existing technology, which has the advantages of uniform stress, not easily deformed, material saving, easy processing, and low cost.

[0006] The purpose of the present invention is achieved as follows: A type B liquefied gas storage tank is vertically arranged in the storage tank cavity and includes a tank body outer shell, a tank body internal structure, a heat insulation layer, and a tank bottom support mechanism; wherein,

[0007] The tank body outer shell is in the shape of a cylindrical barrel, and a cylindrical gas dome extending from the top of the tank body outer shell penetrates through the top plate of the storage tank cavity;

[0008] The tank body internal structure includes two middle strengthening frames, several vertical strengthening members, several horizontal strong structure rings, multiple horizontal weak structure rings, a tank top strengthening structure, and a tank bottom strengthening structure;

[0009] The middle strengthening frame is composed of a top middle strong structure fixed on the inner wall surface of the top of the tank body outer shell, a bottom middle strong structure fixed on the inner wall surface of the bottom of the tank body outer shell, and two side middle strong structures fixed on the inner wall surface of the side of the tank body outer shell; the top middle strong structure and the bottom middle strong structure of one middle strengthening frame are both located on the transverse center line of the storage tank cavity, and the top middle strong structure and the bottom middle strong structure of the other middle strengthening frame are both located on the longitudinal center line of the storage tank cavity;

[0010] Several vertical strong structures are circumferentially and uniformly fixed on the inner wall surface of the side of the tank body outer shell together with the side middle strong structures of the two strengthening frames;

[0011] Several horizontal strong structure rings are fixed on the inner wall surface of the side of the tank body outer shell at intervals along the height direction of the tank body outer shell;

[0012] A plurality of horizontal weak structure rings are fixedly arranged on the inner wall surface of the side part of the tank body shell at intervals along the height direction of the tank body shell and are staggered with a plurality of horizontal strong structure rings.

[0013] The tank top strengthening structure includes a top inner annular strong structure, a top outer annular strong structure and a plurality of top radial strong structures; the inner diameter of the top inner annular strong structure is adapted to the inner diameter of the air dome, and the top inner annular strong structure is fixedly arranged at the center of the inner wall surface of the top of the tank body shell and disconnects the middle parts of the top strong structures of the two middle strengthening frames; the top outer annular strong structure is fixedly arranged on the inner wall surface of the top of the tank body shell and is coaxially located on the periphery of the top inner annular strong structure; a plurality of top radial strong structures are fixedly arranged on the inner wall surface of the top of the tank body shell corresponding to a plurality of vertical strong structures one by one and are respectively bridged between the tops of a plurality of vertical strong structures and the outer peripheral surface of the top outer annular strong structure.

[0014] The tank bottom strengthening structure includes a bottom inner annular strong structure, a bottom outer annular strong structure and a plurality of bottom radial strong structures; the bottom inner annular strong structure is fixedly arranged at the center of the inner wall surface of the bottom of the tank body shell; the bottom outer annular strong structure is fixedly arranged on the inner wall surface of the bottom of the tank body shell and is coaxially located on the periphery of the bottom inner annular strong structure; a plurality of bottom radial strong structures are fixedly arranged on the inner wall surface of the bottom of the tank body shell corresponding to a plurality of vertical strong structures one by one and are respectively bridged between the bottoms of a plurality of vertical strong structures and the outer peripheral surface of the bottom inner annular strong structure.

[0015] The heat insulation layer is coated on the outer surface of the tank body shell.

[0016] The tank bottom support mechanism includes a bottom anti-sway / anti-tilt support arranged between the bottom center of the tank body shell and the bottom plate of the storage tank cavity and a plurality of bottom support seats evenly arranged between the outer wall surface of the bottom of the tank body shell and the bottom plate of the storage tank cavity.

[0017] For the above-mentioned type B liquefied gas storage tank, the tank body shell and the internal structure of the tank body are both made of nickel steel, high manganese steel, stainless steel or aluminum alloy.

[0018] For the above-mentioned type B liquefied gas storage tank, the tank top strengthening structure further includes a plurality of top annular weak structures coaxially fixed on the inner wall surface of the top of the tank body shell with the top inner annular strong structure.

[0019] For the above-mentioned type B liquefied gas storage tank, the tank bottom strengthening structure further includes a plurality of bottom annular weak structures coaxially fixed on the inner wall surface of the bottom of the tank body shell with the bottom inner annular strong structure.

[0020] For the above-mentioned type B liquefied gas storage tank, the material of the heat insulation layer is polystyrene or polyurethane plate insulation.

[0021] The above-mentioned Type B liquefied gas storage tank, wherein when the liquefied gas storage tank is installed in the storage tank cavity of a liquefied gas carrier or the storage tank cavity of an offshore platform, the liquefied gas storage tank further includes a plurality of top anti-floating supports evenly arranged between the top of the tank body shell and the top plate of the storage tank cavity;

[0022] The structure of the top anti-floating support is the same as that of the bottom support seat and includes a top seat, a bottom seat and a laminated wooden block arranged between the top seat and the bottom seat; both the top seat and the bottom seat are made of nickel steel, high manganese steel, stainless steel or aluminum alloy.

[0023] The characteristics of the Type B liquefied gas storage tank of the present invention are as follows:

[0024] 1. The tank body shell of the present invention is cylindrical, and the internal structure is mostly annular. Since the forces on all parts of the circle are balanced, it is not easy to deform even when the temperature changes.

[0025] 2. The tank body shell of the present invention is cylindrical, and it requires less forming material than other columnar bodies. Therefore, for the same volume, the cylindrical tank requires the least amount of material, so materials can be saved.

[0026] 3. The tank body shell of the present invention is cylindrical. Compared with other shapes, the processing technology is relatively simple, it is easy to form, and the manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the axial sectional view of the Type B liquefied gas storage tank of the present invention;

[0028] Figure 2 is Figure 1 the view in the direction of A-A in

[0029] Figure 3 is Figure 1 the view in the direction of B-B in

[0030] Figure 4 is Figure 1 the view in the direction of C in

[0031] Figure 5 is Figure 1 the view in the direction of D in DETAILED DESCRIPTION OF THE INVENTION

[0032] The present invention will be further described below in conjunction with the drawings.

[0033] Please refer to Figures 1 to 5 , the Type B liquefied gas storage tank of the present invention is vertically arranged in the storage tank cavity and includes a tank body shell 1, an internal structure of the tank body, a heat insulation layer 8 and a tank bottom support mechanism.

[0034] The tank body outer shell 1 is in the shape of a cylindrical barrel, and a cylindrical gas dome 10 extending through the top plate 20 of the storage tank cavity extends from the center of the top of the tank body outer shell 1.

[0035] The internal structure of the tank body includes two middle strengthening frames 2, four vertical strengthening members 3, three horizontal strong structure rings 4, eight horizontal weak structure rings 5, a tank top strengthening structure and a tank bottom strengthening structure; among them,

[0036] The middle strengthening frame 2 is made of T-shaped steel and is composed of a top middle strong structure 21 fixed on the inner wall surface of the top of the tank body outer shell 1, a bottom middle strong structure 22 fixed on the inner wall surface of the bottom of the tank body outer shell 1, and two side middle strong structures 23 fixed on the inner wall surface of the side of the tank body outer shell 1. Fillets are provided between the top ends of the two side middle strong structures 23 and the two ends of the top middle strong structure 21 respectively, and between the bottom ends of the two side middle strong structures 23 and the two ends of the bottom middle strong structure 22 respectively, which can enhance the strength of the middle strengthening frame 2; the top middle strong structure 21 and the bottom middle strong structure 22 of one middle strengthening frame 2 are both located on the transverse center line of the storage tank cavity, and the top middle strong structure 21 and the bottom middle strong structure 22 of the other middle strengthening frame 2 are both located on the longitudinal center line of the storage tank cavity;

[0037] The vertical strengthening member 3 is also made of T-shaped steel; the four vertical strong structures 3 and the side middle strong structures 23 of the two middle strengthening frames 2 are fixedly arranged on the inner wall surface of the side of the tank body outer shell 1 in a circumferentially uniform manner;

[0038] The three horizontal strong structure rings 4 are fixedly arranged on the inner wall surface of the side of the tank body outer shell 1 at intervals along the height direction of the tank body outer shell 1; the cross section of the horizontal strong structure ring 4 is in the shape of an inverted T.

[0039] The eight horizontal weak structure rings 5 are fixedly arranged on the inner wall surface of the side of the tank body outer shell 1 at intervals along the height direction of the tank body outer shell 1 and are staggered with several horizontal strong structure rings 4; the cross section of the horizontal weak structure ring 5 is in the shape of an L.

[0040] The tank top strengthening structure includes a top inner annular strengthening structure 61, a top outer annular strengthening structure 62, four top radial strengthening structures 63 and five top annular weakening structures 64; the inner diameter of the top inner annular strengthening structure 61 is adapted to the inner diameter of the gas dome 10, and the top inner annular strengthening structure 61 is fixed at the center of the top inner wall surface of the tank shell 1 and disconnects the middle parts of the top middle strengthening structures 21 of the two middle strengthening frames 2; the top outer annular strengthening structure 62 is fixed on the top inner wall surface of the tank shell 1 and is coaxially located outside the top inner annular strengthening structure 61; the four top radial strengthening structures 63 are fixedly connected to the four vertical strengthening structures 3 one by one on the top inner wall surface of the tank shell 1 and are respectively bridged between the tops of the four vertical strengthening structures 3 and the outer peripheral surface of the top outer annular strengthening structure 62; the five top annular weakening structures 64 are coaxially fixed on the top inner wall surface of the tank shell 1 with the top inner annular strengthening structure 61; the cross-sections of the top inner annular strengthening structure 61, the top outer annular strengthening structure 62 and the four top radial strengthening structures 63 are all T-shaped; the cross-section of the top annular weakening structure 64 is L-shaped;

[0041] The tank bottom strengthening structure includes a bottom inner annular strengthening structure 71, a bottom outer annular strengthening structure 72, four bottom radial strengthening structures 73 and five bottom annular weakening structures 74; the bottom inner annular strengthening structure 71 is fixed at the center of the bottom inner wall surface of the tank shell 1; the bottom outer annular strengthening structure 72 is fixed on the bottom inner wall surface of the tank shell 1 and is coaxially located outside the bottom inner annular strengthening structure 71; the four bottom radial strengthening structures 73 are fixedly connected to the four vertical strengthening structures 3 one by one on the bottom inner wall surface of the tank shell 1 and are respectively bridged between the bottoms of the four vertical strengthening structures 3 and the outer peripheral surface of the bottom inner annular strengthening structure 71; multiple bottom annular weakening structures 74 are coaxially fixed on the bottom inner wall surface of the tank shell 1 with the bottom inner annular strengthening structure 71; the cross-sections of the bottom inner annular strengthening structure 71, the bottom outer annular strengthening structure 72 and the four bottom radial strengthening structures 73 are all T-shaped; the cross-section of the bottom annular weakening structure 74 is L-shaped.

[0042] Both the tank shell 1 and the internal structure of the tank are made of cryogenic-resistant nickel steel, high manganese steel, stainless steel or aluminum alloy (grade 5083 - O).

[0043] The heat insulation layer 8 is coated on the outer surface of the tank shell 1; the material of the heat insulation layer 8 is polystyrene (EPS) or polyurethane (PU) plate insulation; the thickness and material of the heat insulation layer 8 can be adjusted according to specific requirements, and the evaporation rate is generally less than 0.25% per day.

[0044] The tank bottom support mechanism includes a bottom anti-sway / anti-tip support 9A provided between the bottom center of the tank shell 1 and the bottom plate 19 of the storage tank cavity and several bottom support seats 9B evenly arranged between the bottom outer wall surface of the tank shell 1 and the bottom plate 19 of the storage tank cavity.

[0045] When the liquefied gas storage tank is installed in the storage tank cavity of a liquefied gas carrier or the storage tank cavity of an offshore platform, the liquefied gas storage tank further includes a number of top anti-floating supports 9C evenly arranged between the top of the tank body shell 1 and the roof plate 20 of the storage tank cavity.

[0046] The structure of the top anti-floating support 9C is the same as that of the bottom support seat 9B and includes a top seat 91, a bottom seat 92, and a laminated wood block 90 arranged between the top seat 91 and the bottom seat 92; both the top seat 91 and the bottom seat 92 are made of low-temperature-resistant nickel steel, high manganese steel, stainless steel, or aluminum alloy (grade 5083-O). The laminated wood block 90 is made of birch veneer and is hot-pressed after being impregnated with resin. The laminated wood block 90 is bonded to the top seat 91 and the bottom seat 92 with epoxy glue, which is used for installing liquefied petroleum gas / liquefied natural gas storage tanks, chemical storage tanks, and other containment systems, sliding doors, and anchor plates, etc., to position the laminated wood block 90 on the storage tank surface and the storage tank saddle, eliminating all precision fittings.

[0047] The top anti-floating support 9C and the bottom support seat 9B can withstand and restrain the vertical movement of the type B liquefied gas storage tank. The bottom anti-sway / anti-tilt support 9A can withstand and restrain the lateral and longitudinal movements of the type B liquefied gas storage tank.

[0048] The type B liquefied gas storage tank of the present invention can be used for storing many cryogenic liquids such as liquefied natural gas, liquid ammonia, and liquid nitrogen, and has many advantages such as uniform stress, not easily deformed, material saving, easy processing, and low cost, and can be used in various fields of ship cargo holds, liquid cargo storage tanks on offshore platforms, and land liquid cargo storage tanks.

[0049] The above embodiments are only for illustrating the present invention and are not intended to limit the present invention. Those skilled in the relevant technical fields can also make various transformations or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by each claim.

Claims

1. A B-type liquefied gas storage tank, which is vertically arranged in the storage tank cavity and comprises a tank shell, a tank internal structure, a heat insulation layer and a tank bottom support mechanism; characterized in that: The tank shell is in the shape of a cylindrical barrel, and a cylindrical air dome extending from the top of the tank shell passes through the top plate of the tank cavity; The internal structure of the tank body includes two middle reinforcement frames, a number of vertical reinforcements, a number of horizontal strong structural rings, a plurality of horizontal weak structural rings, a tank top reinforcement structure and a tank bottom reinforcement structure; The middle reinforcement frame is composed of a top middle-strong structure fixed on the top inner wall surface of the tank shell, a bottom middle-strong structure fixed on the bottom inner wall surface of the tank shell, and two side middle-strong structures fixed on the side inner wall surfaces of the tank shell; the top middle-strong structure and the bottom middle-strong structure of one middle reinforcement frame are both located on the transverse center line of the storage tank cavity, and the top middle-strong structure and the bottom middle-strong structure of the other middle reinforcement frame are both located on the longitudinal center line of the storage tank cavity; A plurality of vertical strong structures and the side middle strong structures of the two reinforcement frames are evenly fixed on the side inner wall surface of the tank shell; A plurality of horizontal strong structural rings are fixed at intervals on the inner wall surface of the side of the tank shell along the height direction of the tank shell; A plurality of horizontal weak structure rings are fixed on the inner wall surface of the side of the tank shell at intervals along the height direction of the tank shell and staggered with a plurality of horizontal strong structure rings; The tank top reinforcement structure includes a top inner annular strong structure, a top outer annular strong structure and a plurality of top radial strong structures; the inner diameter of the top inner annular strong structure is adapted to the inner diameter of the gas dome, the top inner annular strong structure is fixed at the center of the top inner wall surface of the tank shell and disconnects the middle part of the top middle strong structure of the two middle reinforcement frames; the top outer annular strong structure is fixed on the top inner wall surface of the tank shell and is coaxially located on the periphery of the top inner annular strong structure; a plurality of top radial strong structures and a plurality of vertical strong structures are fixed one-to-one on the top inner wall surface of the tank shell and are one-to-one bridged between the tops of the plurality of vertical strong structures and the outer peripheral surface of the top outer annular strong structure; The tank bottom reinforcement structure includes a bottom inner annular strong structure, a bottom outer annular strong structure and a plurality of bottom radial strong structures; the bottom inner annular strong structure is fixed to the center of the bottom inner wall surface of the tank shell; the bottom outer annular strong structure is fixed to the bottom inner wall surface of the tank shell and is coaxially located at the periphery of the bottom inner annular strong structure; a plurality of bottom radial strong structures and a plurality of vertical strong structures are fixed to the bottom inner wall surface of the tank shell in a one-to-one correspondence and are bridged between the bottom of the plurality of vertical strong structures and the outer peripheral surface of the bottom inner annular strong structure in a one-to-one correspondence; The heat insulation layer is coated on the outer surface of the tank shell; The tank bottom support mechanism includes a bottom anti-sway / anti-tilt support seat arranged between the bottom center of the tank shell and the bottom plate of the tank cavity and a plurality of bottom support seats evenly distributed between the bottom outer wall surface of the tank shell and the bottom plate of the tank cavity.

2. The type B liquefied gas storage tank according to claim 1, characterized in that: The outer shell of the tank and the internal structure of the tank are both made of nickel steel, high manganese steel, stainless steel or aluminum alloy.

3. The type B liquefied gas storage tank according to claim 1, characterized in that: The tank top reinforcement structure also includes a plurality of top annular weak structures coaxially fixed to the top inner wall surface of the tank shell with the top inner annular strong structure.

4. The type B liquefied gas storage tank according to claim 1, characterized in that: The tank bottom reinforcement structure also includes a plurality of bottom annular weak structures coaxially fixed to the bottom inner wall surface of the tank shell with the bottom inner annular strong structure.

5. The type B liquefied gas storage tank according to claim 1, characterized in that: The material of the heat insulation layer is polystyrene or polyurethane board insulation.

6. The type B liquefied gas storage tank according to any one of claims 1 to 5, characterized in that: When the liquefied gas storage tank is installed in a storage tank cavity of a liquefied gas transport ship or a storage tank cavity of an offshore platform, the liquefied gas storage tank further comprises a plurality of top anti-floating supports evenly distributed between the top of the tank shell and the top plate of the storage tank cavity; The structure of the top anti-floating support is the same as that of the bottom support seat and comprises a top seat, a base and a laminated wood block arranged between the top seat and the base; the top seat and the base are both made of nickel steel, high manganese steel, stainless steel or aluminum alloy.

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