Corrugated protection device for liquefied hydrocarbon spherical tank and design method of corrugated protection device

Abstract

The invention relates to the technical field of spherical tank protection, in particular to a corrugated protection device for a liquefied hydrocarbon spherical tank and a design method thereof.The protection device comprises a tank body protection cover used for protecting the tank body, and the tank body protection cover comprises an inner protection layer and an outer protection layer arranged on the inner protection layer; the inner protection layer comprises a plurality of corrugated plate layers, each corrugated plate layer comprises a plurality of wave crests and wave troughs which are arranged in a staggered mode, and the wave crests of any corrugated plate layer and the wave troughs of the adjacent corrugated plate layer are oppositely arranged. According to the protective device, the tank body is protected by adopting the tank body protective cover, in the practical application, the safety of the spherical tank can be effectively guaranteed, splashing objects are prevented from directly impacting the spherical tank, the spherical tank is prevented from being damaged, and the protective device has the advantages of being easy and convenient to operate, simple in structure, high in safety and capable of saving cost.

Description

Technical Field

[0001] The invention relates to the technical field of spherical tank protection, and in particular to a corrugated protection device for a liquefied hydrocarbon spherical tank and a design method thereof. Background Art

[0002] As a thin-shell structure, liquefied hydrocarbon spherical tanks have many advantages such as large capacity, low cost, and good stability, so they are widely used in petrochemical enterprises and chemical parks. However, under the impact of combustible vapor cloud explosion or splash, thin-walled steel storage tanks are very likely to produce large plastic deformation or penetration damage, which will lead to leakage of internal combustible materials, secondary explosions, and even chain domino effects.

[0003] At present, the existing relevant standards and specifications at home and abroad have not proposed effective measures for explosion and impact protection of spherical tanks. Therefore, the more common methods for protecting spherical tanks are usually masonry walls or concrete guard plates to put the spherical tanks in a safe environment to ensure the safety of the spherical tanks. However, these methods can only be applied to some small spherical tanks, but are difficult to apply to large-sized and high-back-pressure spherical tanks. They also have the disadvantages of complex implementation and high cost. Even in some cases where the application site is limited, the above methods cannot be applied to protect the spherical tanks.

[0004] Therefore, there is an urgent need for a corrugated protection device for a liquefied hydrocarbon spherical tank and a design method thereof to comprehensively improve the anti-explosion and anti-impact protection performance of the spherical tank. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of lack of effective protection device for spherical tanks in the prior art, especially for liquefied hydrocarbon spherical tanks, and to provide a corrugated protection device for liquefied hydrocarbon spherical tanks and a design method thereof.

[0006] In order to achieve the above-mentioned object, the first aspect of the present invention provides a corrugated protective device for a liquefied hydrocarbon spherical tank, the corrugated protective device for a liquefied hydrocarbon spherical tank comprising:

[0007] A tank body protective cover is used to protect the tank body. The tank body protective cover includes an inner protective layer and an outer protective layer arranged on the inner protective layer. The inner protective layer includes several layers of corrugated plate layers, and each layer of the corrugated plate layers includes several staggered peaks and troughs. The peaks of any corrugated plate layer are arranged relative to the troughs of the adjacent corrugated plate layer.

[0008] Preferably, a cavity formed between a wave crest of any of the corrugated board layers and a wave trough of an adjacent corrugated board layer is filled with a protective filler, and the protective filler is made of rigid foamed polyurethane.

[0009] Preferably, the closed-cell rate of the rigid polyurethane foam is > 90%, the density is > 40 kg / m 3 , the thermal conductivity is > 0.02 W / (m·K), and the fire rating is B1 level.

[0010] Preferably, the vertical height between the peak plate of the corrugated plate layer and the horizontal plane is 25 - 35 mm, and the thickness of the corrugated plate layer is 1 - 10 mm.

[0011] Preferably, the inner angle a between the peak plate and / or the trough plate of the corrugated plate layer and the hypotenuse is 100 - 150°.

[0012] Preferably, the trough plate and the peak plate are arranged in parallel and have the same size.

[0013] Preferably, the inner protective layer includes 2 - 4 layers of corrugated plate layers.

[0014] Preferably, extending outward along the surface of the tank body, the thicknesses of several layers of the corrugated plate layers decrease in sequence, and the decreasing value of the thickness is 1 - 3 mm.

[0015] Preferably, vacuum brazing is adopted between adjacent corrugated plate layers.

[0016] Preferably, the corrugated plate layer is made of any one of super-hard aluminum alloy, high-strength titanium alloy and carbon steel.

[0017] Preferably, the outer protective layer is made of hardened case-hardened steel and has a thickness of 4 - 8 mm.

[0018] Preferably, the surface of the outer protective layer is coated with a fireproof layer, and the fireproof layer is an intumescent steel structure fireproof coating.

[0019] The second aspect of the present invention provides a design method for a corrugated protection device for a liquefied hydrocarbon spherical tank, which is applied to the corrugated protection device for a liquefied hydrocarbon spherical tank. The design method includes:

[0020] Based on the installation position of the liquefied hydrocarbon spherical tank, quantitatively evaluate the risks it faces and obtain a quantitative evaluation result;

[0021] Design a corrugated protection device for a liquefied hydrocarbon spherical tank according to the quantitative evaluation result.

[0022] Preferably, the quantitative evaluation of the risks it faces specifically includes:

[0023] According to the layout and risk level of the devices around the liquefied hydrocarbon spherical tank and the local meteorological conditions, quantitatively evaluate the risks it faces by using the numerical simulation method.

[0024] Preferably, the design of the corrugated protection device for a liquefied hydrocarbon spherical tank according to the quantitative evaluation result specifically includes:

[0025] Design a corrugated protection device for a liquefied hydrocarbon spherical tank according to the maximum impact force of the splashes in the quantitative evaluation results.

[0026] According to the above technical solution, by using the tank body protection cover to protect the tank body, in practical applications, the safety of the spherical tank can be effectively guaranteed, preventing splashes from directly impacting the spherical tank and causing the spherical tank to be damaged. It has the advantages of simple operation, simple structure, high safety and cost savings.

[0027] At the same time, by setting that the cavity formed by the relative arrangement between the wave crest of any one corrugated plate layer and the wave trough of the adjacent corrugated plate layer is filled with a protective filler, the protective filler is made of rigid foamed polyurethane, the closed cell rate of the rigid foamed polyurethane > 90%, the density > 40 kg / m 3 , the thermal conductivity > 0.02 W / (m·k), and the fire protection grade is B1. In practical applications, the protection performance of the protection device can be further effectively improved, thereby preventing the splashes from causing the tank body to be damaged.

[0028] By setting the vertical height between the wave crest plate of the corrugated plate layer and the horizontal plane to be 25 - 35 mm, the thickness of the corrugated plate layer to be 1 - 10 mm, the inner angle a between the wave crest plate and / or the wave trough plate of the corrugated plate layer and the hypotenuse to be 100 - 150°, and the wave trough plate and the wave crest plate to be arranged in parallel and have the same size. In practical applications, the protection performance of the protection device can be further effectively improved, thereby preventing the splashes from causing the tank body to be damaged. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the corrugated plate layer of the corrugated protection device for a liquefied hydrocarbon spherical tank in a specific embodiment;

[0030] Figure 2 is a schematic overall structural diagram of the corrugated protection device for a liquefied hydrocarbon spherical tank in a specific embodiment;

[0031] Figure 3 is Figure 2 a partial enlarged structural diagram of the corrugated protection device for a liquefied hydrocarbon spherical tank shown at A.

[0032] Description of the Reference Numerals

[0033] 1. Corrugated plate layer; 2. Wave crest; 3. Wave trough; 4. Wave crest plate; 5. Wave trough plate; 6. Hypotenuse. Detailed Embodiment

[0034] The following will describe in detail the specific implementation manners of the embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0035] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating relative importance or implicitly indicating the quantity of the indicated technical features. Thus, unless otherwise specified, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; the meaning of "a plurality" is two or more. The term "comprising" and any of its variations means non-exclusive inclusion, and may include or add one or more other features, units, components, and / or their combinations.

[0036] In addition, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0037] The present invention provides a corrugated protection device for a liquefied hydrocarbon spherical tank, as Figures 1-3 shown. The corrugated protection device for the liquefied hydrocarbon spherical tank includes:

[0038] A tank body protection cover for protecting the tank body. The tank body protection cover includes an inner protection layer and an outer protection layer provided on the inner protection layer. The inner protection layer includes a plurality of corrugated plate layers 1. Corresponding to each corrugated plate layer 1, there are a plurality of alternately arranged wave crests 2 and wave troughs 3. The wave crest 2 of any one corrugated plate layer 1 is oppositely arranged with the wave trough 3 of the adjacent corrugated plate layer 1.

[0039] According to the above technical solution, by using the tank body protection cover to protect the tank body, in actual application, the safety of the spherical tank can be effectively ensured, preventing flying objects from directly impacting the spherical tank and causing the spherical tank to be damaged, and having the advantages of simple operation, simple structure, high safety, and cost savings.

[0040] In the corrugated protection device for the liquefied hydrocarbon spherical tank of the present invention, preferably, a protective filler is filled in the cavity formed by the opposite arrangement of the wave crest 2 of any one corrugated plate layer 1 and the wave trough 3 of the adjacent corrugated plate layer 1. The protective filler is made of rigid foamed polyurethane. In actual application, the protection performance of the protection device can be further effectively improved.

[0041] In a further preferred embodiment, the closed-cell rate of the rigid foamed polyurethane > 90%, the density > 40 kg / m 3 , the thermal conductivity > 0.02 W / (m·K), and the fire protection rating is B1. In actual application, it can further effectively ensure the protection performance and fireproof and heat-insulating performance of the device. When any one of the parameters of the closed-cell rate, density, and thermal conductivity of the rigid foamed polyurethane does not meet the requirements, the protection effect will be reduced.

[0042] In the corrugated protection device for a liquefied hydrocarbon spherical tank according to the present invention, preferably, as Figure 1 shown, corresponding to the single-layer corrugated plate layer 1, the vertical height between the peak plate 4 of the corrugated plate layer 1 and the horizontal plane is 25 - 35 mm, more preferably 28 - 32 mm, and the thickness of the corrugated plate layer 1 is 1 - 10 mm, more preferably 2 - 8 mm; thus, the protection performance of the protection device is further improved in terms of structural design.

[0043] In a further preferred embodiment, the inner angle a between the peak plate 4 and / or the valley plate 5 of the corrugated plate layer 1 and the hypotenuse 6 is 100 - 150°, more preferably 110 - 130°, and most preferably 120°. Among them, when the inner angle a is 120°, the cross-section of the cavity formed by the opposite arrangement between the peak 2 of any corrugated plate layer 1 and the valley 3 of the adjacent corrugated plate layer 1 is a regular hexagon, thereby effectively improving the protection performance of the protection device. Further, the valley plate 5 and the peak plate 4 are arranged in parallel and have the same size, thereby further effectively improving the protection performance of the protection device.

[0044] In the corrugated protection device for a liquefied hydrocarbon spherical tank according to the present invention, preferably, the inner protection layer includes 2 - 4 layers of corrugated plate layers, preferably 3 layers. The corrugated plate layer 1 is made of any one of super-hard aluminum alloy, high-strength titanium alloy, and carbon steel. Specifically, the carbon steel includes Q235 steel and Q345 steel, and the corrugated plate layer 1 is preferably made of Q345 steel. Thus, in actual application, while ensuring the protection performance of the protection device, the size of the protection device can be within a suitable range, so that it can be better applied to the liquefied hydrocarbon spherical tank.

[0045] In a further preferred embodiment, extending outward along the surface of the tank body, the thicknesses of several layers of the corrugated plate layer 1 decrease in sequence, and the decrease value of the thickness is 1 - 3 mm. In a specific embodiment, as Figure 3As shown, when the inner protective layer includes three corrugated plate layers, the vertical height between the peak plate 4 of the corrugated plate layer 1 and the horizontal plane is 30 mm, and it further extends outward along the surface of the tank body. The thickness of the third corrugated plate layer is 5 - 8 mm, the thickness of the second corrugated plate layer is 3 - 6 mm, and the thickness of the first corrugated plate layer is 2 - 4 mm. More specifically, the thickness of the third corrugated plate layer is 6 mm, the thickness of the second corrugated plate layer is 4 mm, and the thickness of the first corrugated plate layer is 2 mm, with a thickness reduction value of 2 mm. This can further effectively improve the protection performance of the protection device and save costs. In another specific embodiment, the thicknesses of other corrugated plate layers can also be directly determined based on the thickness of the third corrugated plate layer (i.e., the first layer) and the thickness reduction value from the inside to the outside. Specifically, for example, if the thickness of the third corrugated plate layer is 5 - 8 mm and the thickness reduction value is 1 - 3 mm, when the thickness of the third corrugated plate layer is set to 6 mm and the thickness reduction value is 2 mm, the thicknesses of the second corrugated plate layer and the first corrugated plate layer can be determined to be 4 mm and 2 mm respectively.

[0046] In the corrugated protection device for liquefied hydrocarbon spherical tanks according to the present invention, preferably, vacuum brazing is used between adjacent corrugated plate layers 1. Specifically, as Figure 1 and 3 shown, the upper surface of the top of the peak plate 4 of the second corrugated plate layer is welded to the lower surface of the bottom of the valley plate 5 of the first corrugated plate layer by vacuum brazing, so as to avoid the deformation caused by uneven heating of the corrugated plate during welding by the traditional local melting welding method, thereby improving the stability and durability of the multi-layer corrugated plate layer.

[0047] In the corrugated protection device for liquefied hydrocarbon spherical tanks according to the present invention, preferably, the outer protective layer, i.e., the hard anti-explosion and anti-impact layer as Figure 3 shown, is made of hardened carburized steel. Further preferably, the thickness of the outer protective layer made of hardened carburized steel is 4 - 8 mm, more preferably 2 - 6 mm, so as to effectively improve the anti-impact performance and anti-shock performance of the protection device.

[0048] In the corrugated protection device for liquefied hydrocarbon spherical tanks according to the present invention, preferably, a fire protection layer is provided on the surface of the outer protection layer, and the fire protection layer is an intumescent steel structure fire protection coating. In practical applications, by applying the fire protection coating on the surface of the outer protection layer to form a fire protection layer, the fire resistance limit of the component can be improved and the rapid spread of fire can be blocked. Among them, the fire protection coating can be a thin-type (3 - 10 mm) steel structure fire protection coating or a thick-type (10 - 30 mm) steel structure fire protection coating. Specifically, for spherical tanks with a fire resistance limit requirement of more than 2.5 hours, a thick-type steel structure fire protection coating is used; for spherical tanks with a fire resistance limit requirement of no more than 2.5 hours, a thin-type steel structure fire protection coating is used. Among them, the fire protection principle of the fire protection coating is that the coating slowly expands and foams under the action of fire to form a dense and hard fire insulation layer, delaying the rise of the temperature of the internal steel and effectively protecting the multi-layer corrugated plate component.

[0049] The second aspect of the present invention provides a design method for a corrugated protection device for liquefied hydrocarbon spherical tanks, which is applied to the corrugated protection device for liquefied hydrocarbon spherical tanks, and the design method includes:

[0050] Based on the installation position of the liquefied hydrocarbon spherical tank, quantitatively evaluate the risks it faces and obtain the quantitative evaluation results;

[0051] Design a corrugated protection device for liquefied hydrocarbon spherical tanks according to the quantitative evaluation results.

[0052] In a specific embodiment, the quantitative evaluation of the risks it faces specifically includes:

[0053] According to the layout and risk level of the devices around the liquefied hydrocarbon spherical tank and the local meteorological conditions, use the numerical simulation method to quantitatively evaluate the risks it faces.

[0054] The design of the corrugated protection device for liquefied hydrocarbon spherical tanks according to the quantitative evaluation results specifically includes:

[0055] Design a corrugated protection device for liquefied hydrocarbon spherical tanks according to the maximum value of the impact force of the splashes in the quantitative evaluation results.

[0056] In the design method of the present invention, based on the maximum value of the impact force of the splashes in the quantitative evaluation results, in practical applications, the number of layers, thickness, cavity shape, and inner angle of the corrugated plate layer included in the inner protection layer can be quickly and accurately determined, so as to ensure the protection performance of the protection device while reducing the modification difficulty of the liquefied hydrocarbon spherical tank and thus saving costs.

[0057] In some embodiments, the corrugated protection device for liquefied hydrocarbon spherical tanks according to the present invention includes:

[0058] The tank protective cover is used to protect the tank. The tank protective cover includes an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer includes several corrugated plate layers 1. Corresponding to each corrugated plate layer 1, there are several alternately arranged wave crests 2 and wave troughs 3. The wave crest 2 of any corrugated plate layer 1 is arranged opposite to the wave trough 3 of the adjacent corrugated plate layer 1; Vacuum brazing is used between adjacent corrugated plate layers 1; The outer protective layer is made of hardened carburized steel and has a thickness of 4-8 mm; The surface of the outer protective layer is coated with a fireproof layer, and the fireproof layer is an intumescent steel structure fireproof coating.

[0059] In some other embodiments, the corrugated protection device for a liquefied hydrocarbon spherical tank of the present invention includes:

[0060] The tank protective cover is used to protect the tank. The tank protective cover includes an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer includes several corrugated plate layers 1. Corresponding to each corrugated plate layer 1, there are several alternately arranged wave crests 2 and wave troughs 3. The wave crest 2 of any corrugated plate layer 1 is arranged opposite to the wave trough 3 of the adjacent corrugated plate layer 1; A protective filler is filled in the cavity formed by the relative arrangement between the wave crest 2 of any corrugated plate layer 1 and the wave trough 3 of the adjacent corrugated plate layer 1. The protective filler is made of rigid polyurethane foam; Vacuum brazing is used between adjacent corrugated plate layers 1; The outer protective layer is made of hardened carburized steel and has a thickness of 4-8 mm; The surface of the outer protective layer is coated with a fireproof layer, and the fireproof layer is an intumescent steel structure fireproof coating.

[0061] In some other embodiments, the corrugated protection device for a liquefied hydrocarbon spherical tank of the present invention includes:

[0062] The tank protective cover is used to protect the tank. The tank protective cover includes an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer includes several corrugated plate layers 1. Corresponding to each corrugated plate layer 1, there are several alternately arranged wave crests 2 and wave troughs 3. The wave crest 2 of any corrugated plate layer 1 is arranged opposite to the wave trough 3 of the adjacent corrugated plate layer 1; A protective filler is filled in the cavity formed by the relative arrangement between the wave crest 2 of any corrugated plate layer 1 and the wave trough 3 of the adjacent corrugated plate layer 1. The protective filler is made of rigid polyurethane foam; The closed cell rate of the rigid polyurethane foam > 90%, the density > 40 kg / m 3 , the thermal conductivity > 0.02 W / (m·k), and the fire protection grade is B1; Vacuum brazing is used between adjacent corrugated plate layers 1; The outer protective layer is made of hardened carburized steel and has a thickness of 4-8 mm; The surface of the outer protective layer is coated with a fireproof layer, and the fireproof layer is an intumescent steel structure fireproof coating.

[0063] In some other embodiments, the corrugated protection device for a liquefied hydrocarbon spherical tank of the present invention comprises:

[0064] A tank body protective cover for protecting the tank body. The tank body protective cover comprises an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer comprises a plurality of corrugated plate layers 1. Corresponding to each corrugated plate layer 1, a plurality of alternately arranged wave crests 2 and wave troughs 3 are included. The wave crest 2 of any one corrugated plate layer 1 is arranged opposite to the wave trough 3 of the adjacent corrugated plate layer 1. A protective filler is filled in the cavity formed by the relative arrangement between the wave crest 2 of any one corrugated plate layer 1 and the wave trough 3 of the adjacent corrugated plate layer 1. The protective filler is made of rigid foamed polyurethane. The closed cell rate of the rigid foamed polyurethane is >90%, the density is >40 kg / m 3 , the thermal conductivity is >0.02 W / (m·k), and the fire protection grade is B1. The vertical height between the wave crest plate 4 of the corrugated plate layer 1 and the horizontal plane is 25-35 mm, and the thickness of the corrugated plate layer 1 is 1-10 mm. The inner angle a between the wave crest plate 4 and / or the wave trough plate 5 of the corrugated plate layer 1 and the hypotenuse 6 is 100-150°. The wave trough plate 5 and the wave crest plate 4 are arranged in parallel and have the same size. The adjacent corrugated plate layers 1 are joined by vacuum brazing. The outer protective layer is made of hardened case-hardened steel and has a thickness of 4-8 mm. The surface of the outer protective layer is coated with a fire protection layer, and the fire protection layer is an intumescent steel structure fire protection coating.

[0065] In some other embodiments, the corrugated protection device for a liquefied hydrocarbon spherical tank of the present invention comprises:

[0066] A tank body protective cover for protecting the tank body. The tank body protective cover comprises an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer comprises a plurality of corrugated plate layers 1. Corresponding to each corrugated plate layer 1, a plurality of alternately arranged wave crests 2 and wave troughs 3 are included. The wave crest 2 of any one corrugated plate layer 1 is arranged opposite to the wave trough 3 of the adjacent corrugated plate layer 1. A protective filler is filled in the cavity formed by the relative arrangement between the wave crest 2 of any one corrugated plate layer 1 and the wave trough 3 of the adjacent corrugated plate layer 1. The protective filler is made of rigid foamed polyurethane. The closed cell rate of the rigid foamed polyurethane is >90%, the density is >40 kg / m 3, the thermal conductivity > 0.02 W / (m·K), and the fire resistance rating is B1; the vertical height between the peak plate 4 of the corrugated plate layer 1 and the horizontal plane is 25 - 35 mm, and the thickness of the corrugated plate layer 1 is 1 - 10 mm; the inner angle a between the peak plate 4 and / or the valley plate 5 of the corrugated plate layer 1 and the hypotenuse 6 is 100 - 150°; the valley plate 5 and the peak plate 4 are arranged in parallel and have the same size; the inner protective layer includes 2 - 4 layers of corrugated plate layers; the corrugated plate layer 1 is made of any one of super-hard aluminum alloy, high-strength titanium alloy, and carbon steel; extending outward along the surface of the tank body, the thicknesses of several layers of the corrugated plate layer 1 decrease in sequence, and the decrease value of the thickness is 1 - 3 mm.

[0067] In some other embodiments, the corrugated protection device for a liquefied hydrocarbon spherical tank of the present invention includes:

[0068] A tank body protective cover for protecting the tank body. The tank body protective cover includes an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer includes several layers of corrugated plate layers 1. Corresponding to each layer of the corrugated plate layer 1, several peaks 2 and valleys 3 are arranged alternately. The peak 2 of any corrugated plate layer 1 is arranged opposite to the valley 3 of the adjacent corrugated plate layer 1; a protective filler is filled in the cavity formed by the peak 2 of any corrugated plate layer 1 and the valley 3 of the adjacent corrugated plate layer 1 being arranged opposite to each other. The protective filler is made of rigid foamed polyurethane; the closed cell rate of the rigid foamed polyurethane > 90%, and the density > 40 kg / m 3 , the thermal conductivity > 0.02 W / (m·K), and the fire resistance rating is B1; the vertical height between the peak plate 4 of the corrugated plate layer 1 and the horizontal plane is 25 - 35 mm, and the thickness of the corrugated plate layer 1 is 1 - 10 mm; the inner angle a between the peak plate 4 and / or the valley plate 5 of the corrugated plate layer 1 and the hypotenuse 6 is 100 - 150°; the valley plate 5 and the peak plate 4 are arranged in parallel and have the same size; the inner protective layer includes 2 - 4 layers of corrugated plate layers; the corrugated plate layer 1 is made of any one of super-hard aluminum alloy, high-strength titanium alloy, and carbon steel; extending outward along the surface of the tank body, the thicknesses of several layers of the corrugated plate layer 1 decrease in sequence, and the decrease value of the thickness is 1 - 3 mm; the outer protective layer is made of hardened carburized steel, and the thickness is 4 - 8 mm; the surface of the outer protective layer is coated with a fire protection layer, and the fire protection layer is an intumescent steel structure fire protection coating.

[0069] In some other embodiments, the corrugated protection device for a liquefied hydrocarbon spherical tank of the present invention includes:

[0070] The tank protective cover is used to protect the tank. The tank protective cover includes an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer includes several corrugated plate layers 1. Corresponding to each corrugated plate layer 1, it includes several alternately arranged wave crests 2 and wave troughs 3. The wave crest 2 of any corrugated plate layer 1 is oppositely arranged with the wave trough 3 of the adjacent corrugated plate layer 1; the cavity formed by the relative arrangement between the wave crest 2 of any corrugated plate layer 1 and the wave trough 3 of the adjacent corrugated plate layer 1 is filled with a protective filler, and the protective filler is made of rigid foamed polyurethane; the closed cell rate of the rigid foamed polyurethane > 90%, and the density > 40 kg / m 3 , the thermal conductivity > 0.02 W / (m·k), and the fire rating is B1; the vertical height between the wave crest plate 4 of the corrugated plate layer 1 and the horizontal plane is 25 - 35 mm, and the thickness of the corrugated plate layer 1 is 1 - 10 mm; the inner angle a between the wave crest plate 4 and / or the wave trough plate 5 of the corrugated plate layer 1 and the hypotenuse 6 is 100 - 150°; the wave trough plate 5 and the wave crest plate 4 are arranged in parallel and have the same size; the inner protective layer includes 2 - 4 corrugated plate layers; the corrugated plate layer 1 is made of any one of super-hard aluminum alloy, high-strength titanium alloy, and carbon steel; extending outward along the surface of the tank, the thicknesses of several corrugated plate layers 1 decrease in sequence, and the decrease value of the thickness is 1 - 3 mm; adjacent corrugated plate layers 1 are joined by vacuum brazing; the outer protective layer is made of hardened case-hardened steel and has a thickness of 4 - 8 mm; the surface of the outer protective layer is coated with a fireproof layer, and the fireproof layer is an intumescent steel structure fireproof coating.

[0071] The present invention will be described in detail below through embodiments, but the protection scope of the present invention is not limited thereto.

[0072] Embodiment 1

[0073] Based on the installation position of the liquefied hydrocarbon spherical tank, according to the layout and risk level of the surrounding devices of the liquefied hydrocarbon spherical tank, as well as the local meteorological conditions, the numerical simulation method is used to quantitatively evaluate the potential risks it faces, and the quantitative evaluation results are obtained. Specifically, in the explosion accident, the maximum mass of the splashes that the spherical tank may suffer is 25 kg, and the splash speed is 45 m / s; the peak pressure of the explosion shock wave is 69 kPa, and the positive pressure action time is 20 ms.

[0074] Implement using the corrugated protection device for liquefied hydrocarbon spherical tanks of the present invention. Specifically, the corrugated protection device for liquefied hydrocarbon spherical tanks includes:

[0075] The tank protective cover is used to protect the tank. The tank protective cover includes an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer includes several corrugated plate layers 1. For each corrugated plate layer 1, it includes several alternately arranged wave crests 2 and wave troughs 3. The wave crest 2 of any corrugated plate layer 1 is arranged opposite to the wave trough 3 of the adjacent corrugated plate layer 1.

[0076] The outer protective layer is made of hardened carbon steel. The surface of the outer protective layer is coated with a fireproof layer, and the fireproof layer is an intumescent steel structure fireproof coating. The corrugated plate layer is made of Q235 steel in carbon steel.

[0077] Specifically, the thickness of the outer protective layer is 5 mm, and the inner protective layer includes 3 corrugated plate layers.

[0078] In the actual application process, the tank protective cover is installed on the tank in a semi - covering manner.

[0079] After testing, by using the corrugated protection device for liquefied hydrocarbon spherical tanks of the present invention, the tank of the liquefied hydrocarbon spherical tank can be effectively protected, and it has the advantages of good protection effect and good economic benefit.

[0080] Embodiment 2

[0081] Refer to Embodiment 1 for implementation. The difference is that the cavity formed by the relative arrangement between the wave crest 2 of any corrugated plate layer 1 and the wave trough 3 of the adjacent corrugated plate layer 1 is filled with a protective filler, and the protective filler is made of rigid polyurethane foam.

[0082] After testing, by using the corrugated protection device for liquefied hydrocarbon spherical tanks of the present invention, the tank of the liquefied hydrocarbon spherical tank can be effectively protected, and it has the advantages of better protection effect and good economic benefit.

[0083] Embodiment 3

[0084] Refer to Embodiment 2 for implementation. The difference is that the closed - cell rate of the rigid polyurethane foam > 90%, the density > 40 kg / m 3 , the thermal conductivity > 0.02 W / (m·k), and the fire protection grade is B1.

[0085] After testing, by using the corrugated protection device for liquefied hydrocarbon spherical tanks of the present invention, the tank of the liquefied hydrocarbon spherical tank can be effectively protected, and it has the advantages of better protection effect and good economic benefit.

[0086] Embodiment 4

[0087] Implemented with reference to Example 3, except that the vertical height between the peak plate 4 of the corrugated plate layer 1 and the horizontal plane is 25 - 35 mm, and the thickness of the corrugated plate layer 1 is 1 - 10 mm; extending outward along the surface of the tank body, the thicknesses of several layers of the corrugated plate layer 1 decrease in sequence, and the decrease value of the thickness is 1 - 3 mm.

[0088] Specifically, the vertical height between the peak plate 4 of the corrugated plate layer 1 and the horizontal plane is 30 mm, the thickness of the third corrugated plate layer is 6 mm, the thickness of the second corrugated plate layer is 4 mm, the thickness of the first corrugated plate layer is 2 mm, and the decrease value of the thickness is 2 mm.

[0089] After testing, using the corrugated protection device for liquefied hydrocarbon spherical tanks of the present invention can effectively protect the tank body of the liquefied hydrocarbon spherical tank, and has the advantages of good protection effect and better economic benefits.

[0090] Example 5

[0091] Implemented with reference to Example 4, except that the inner angle a between the peak plate 4 and the trough plate 5 of the corrugated plate layer 1 and the hypotenuse 6 is 120°, the trough plate 5 and the peak plate 4 are arranged in parallel and have the same size.

[0092] After testing, using the corrugated protection device for liquefied hydrocarbon spherical tanks of the present invention can effectively protect the tank body of the liquefied hydrocarbon spherical tank, and has the advantages of better protection effect and better economic benefits.

[0093] Example 6

[0094] Implemented with reference to Example 5, except that vacuum brazing is used between adjacent corrugated plate layers 1.

[0095] After testing, using the corrugated protection device for liquefied hydrocarbon spherical tanks of the present invention can effectively protect the tank body of the liquefied hydrocarbon spherical tank, and has the advantages of better protection effect and better economic benefits. Specifically, the deformation amount on the surface of the tank body is 14 mm.

[0096] Example 7

[0097] Implemented with reference to Example 6, except that the inner protective layer includes 2 layers of corrugated plate layers.

[0098] After testing, using the corrugated protection device for liquefied hydrocarbon spherical tanks of the present invention can effectively protect the liquefied hydrocarbon spherical tank, and has the advantages of good protection effect and good economic benefits. Specifically, the deformation amount on the surface of the tank body is 20 mm.

[0099] Example 8

[0100] Implemented with reference to Example 7, except that the inner protective layer includes 4 layers of corrugated plate layers.

[0101] After detection, by using the corrugated protection device for liquefied hydrocarbon spherical tanks described in the present invention, the liquefied hydrocarbon spherical tanks can be effectively protected, with the advantages of good protection effect and good economic benefits. Specifically, the deformation amount of the tank body surface is 12 mm.

[0102] Furthermore, the present invention discovers through research that when the inner protective layer includes 1 - 4 corrugated plate layers, the relationship between the surface deformation amount f of the liquefied hydrocarbon spherical tank body and the number of corrugated plate layers z is: f = 0.3333z 3 - z 2 - 7.3333z + 36. Thus, in practical applications, it is possible to more quickly and accurately design the described corrugated protection device for liquefied hydrocarbon spherical tanks that meets the requirements according to the maximum impact force of the flying objects that the liquefied hydrocarbon spherical tank body may be subjected to, and save costs.

[0103] The corrugated protection device for liquefied hydrocarbon spherical tanks and its design method provided by the present invention protect the tank body by using the tank body protective cover. In practical applications, it can effectively ensure the safety of the spherical tank, prevent flying objects from directly impacting the spherical tank and causing the spherical tank to be damaged, with the advantages of simple operation, simple structure, high safety and cost savings.

[0104] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not separately describe various possible combinations. But these simple modifications and combinations should also be regarded as the content disclosed by the present invention and all fall within the protection scope of the present invention.

Claims

1. A corrugated protection device for a liquefied hydrocarbon spherical tank, characterized in that The corrugated protection device for the liquefied hydrocarbon spherical tank includes: A tank body protective cover for protecting the tank body. The tank body protective cover includes an inner protective layer and an outer protective layer provided on the inner protective layer. The inner protective layer includes several layers of corrugated plate layers (1). Corresponding to each layer of the corrugated plate layer (1), it includes several alternately arranged wave crests (2) and wave troughs (3). The wave crest (2) of any one of the corrugated plate layers (1) is arranged opposite to the wave trough (3) of the adjacent corrugated plate layer (1).

2. The corrugated protection device for liquefied hydrocarbon spherical tanks according to claim 1, wherein A protective filler is filled in the cavity formed by the relative arrangement between the wave crest (2) of any one of the corrugated plate layers (1) and the wave trough (3) of the adjacent corrugated plate layer (1). The protective filler is made of rigid foamed polyurethane.

3. The corrugated protection device for the liquefied hydrocarbon spherical tank according to claim 2, characterized in that, The closed-cell rate of the rigid foamed polyurethane is > 90%, and the density is > 40 kg / m 3 , the thermal conductivity is > 0.02 W / (m·K), and the fire rating is Class B1.

4. The corrugated protection device for liquefied hydrocarbon spherical tanks according to claim 1, wherein The vertical height between the wave crest plate (4) of the corrugated plate layer (1) and the horizontal plane is 25 - 35 mm, and the thickness of the corrugated plate layer (1) is 1 - 10 mm.

5. The corrugated protection device for a liquefied hydrocarbon spherical tank according to claim 1 or 4, characterized in that, The inner angle a between the wave crest plate (4) and / or the wave trough plate (5) of the corrugated plate layer (1) and the hypotenuse (6) is 100 - 150°.

6. The corrugated protection device for a liquefied hydrocarbon spherical tank according to claim 5, characterized in that, The wave trough plate (5) and the wave crest plate (4) are arranged in parallel and have the same size.

7. The corrugated protection device for a liquefied hydrocarbon spherical tank according to claim 1, wherein The inner protective layer includes 2 - 4 layers of corrugated plate layers.

8. The corrugated protection device for a liquefied hydrocarbon spherical tank according to claim 1 or 7, characterized in that, Extending outward along the surface of the tank body, the thicknesses of several layers of the corrugated plate layers (1) decrease in sequence, and the decreased value of the thickness is 1 - 3 mm.

9. The corrugated protection device for a liquefied hydrocarbon spherical tank according to claim 1 or 7, characterized in that Adjacent corrugated plate layers (1) are joined by vacuum brazing.

10. The corrugated protection device for liquefied hydrocarbon spherical tanks according to claim 1 or 7, characterized in that, The corrugated plate layer (1) is made of any one of superhard aluminum alloy, high-strength titanium alloy, and carbon steel.

11. The corrugated protection device for a liquefied hydrocarbon spherical tank according to claim 1, characterized in that, The outer protective layer is made of hardened carburized steel with a thickness of 4 - 8 mm.

12. The corrugated protection device for a liquefied hydrocarbon spherical tank according to claim 1 or 11, characterized in that, The surface of the outer protective layer is coated with a fireproof layer, and the fireproof layer is an intumescent steel structure fireproof coating.

13. A design method for a corrugated protection device for a liquefied hydrocarbon spherical tank, characterized in that, Applied to the corrugated protection device for the liquefied hydrocarbon spherical tank according to any one of the above claims 1 - 12, the design method includes: Based on the installation position of the liquefied hydrocarbon spherical tank, quantitatively evaluate the risks it faces and obtain the quantitative evaluation result; Design the corrugated protection device for the liquefied hydrocarbon spherical tank according to the quantitative evaluation result.

14. The design method of the corrugated protection device for liquefied hydrocarbon spherical tanks according to claim 13, wherein, The quantitative evaluation of the risks it faces specifically includes: According to the layout and risk level of the devices around the liquefied hydrocarbon spherical tank and the local meteorological conditions, use the numerical simulation method to quantitatively evaluate the risks it faces.

15. The design method of the corrugated protection device for the liquefied hydrocarbon spherical tank according to claim 13, characterized in that, The design of the corrugated protection device for the liquefied hydrocarbon spherical tank according to the quantitative evaluation result specifically includes: Design the corrugated protection device for the liquefied hydrocarbon spherical tank according to the maximum value of the impact force of the splashes in the quantitative evaluation result.

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