Low-temperature butane storage tank

Abstract

The utility model discloses a low-temperature butane storage tank which comprises an outer tank body and an inner tank body arranged in the outer tank body, and further comprises a partition mechanism arranged between the outer tank body and the inner tank body, and the partition mechanism divides the interval between the outer tank body and the inner tank body into an upper independent space and a lower independent space. The independent space located on the upper portion is provided with cold insulation glass wool, and the independent space located on the lower portion is provided with cold insulation expanded perlite. The partition mechanism is additionally arranged between the outer tank body and the inner tank body, an original gas free circulation space is divided into two parts in the vertical direction, evaporated gas is restrained on the upper portion of the partition mechanism, and the lower portion of the partition mechanism does not have the condition for generating condensate due to the fact that medium gas does not exist. Condensed accumulated liquid is prevented from flowing to the bottom of the inner tank body, and the potential damage risk of the bottom structure of the inner tank body is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of butane storage, in particular to a low-temperature butane storage tank. Background Art

[0002] Butane is a key chemical raw material widely used in energy, chemical, and pharmaceutical industries. It is a gas at room temperature. When used as a raw material or product, large quantities are typically stored in cryogenic tanks, cooled to below its boiling point for optimal storage efficiency. These tanks typically feature a two-skinned structure. The inner tank is a vertical cylindrical flat-top, flat-bottom structure designed to hold the cryogenic liquid. Because the thin, flat roof of the inner tank cannot withstand the pressure of the gas phase, a connection port is provided at the top to the outer tank to maintain pressure balance. The outer tank, with its vertical arched roof and flat bottom, is airtight and can withstand slight positive pressures, trapping evaporative gases within the tank. The jacket space between the inner and outer panels of the outer tank is filled with expanded perlite, while the inner and outer floors are padded with foam glass bricks. The flat roof of the inner tank is covered with fiberglass wool. The tanks feature excellent thermal insulation to minimize cooling losses from the cryogenic butane liquid within. A refrigeration system extracts a small amount of evaporative gases, liquefies them, and circulates them back into the tank to maintain thermal equilibrium. In addition to butane, cryogenic liquefied hydrocarbons such as propane, propylene, and ethylene are also stored in cryogenic storage tanks of this structural type.

[0003] As we know from the above, this type of cryogenic storage tank, because the inner tank is not airtight, under normal storage conditions, gas can flow through all the gaps between the inner and outer tanks. The tiny gaps between the expanded perlite particles in the side wall jacket will also be naturally filled with the evaporated gas of the medium. Unlike hydrocarbon media such as propane, propylene, and ethylene, whose standard boiling points are far lower than the general ambient temperature, the standard boiling point of butane (-0.5 to -10.5°C) is relatively close to the surface ambient temperature. Especially in the northern region of China, it is not uncommon for the ambient temperature to be lower than the boiling point of butane in winter. When the ambient temperature of the storage tank is lower than the boiling point of butane, the gaseous butane in the side wall jacket will condense. Under the action of gravity, the condensate gathers at the bottom of the jacket to form liquid accumulation. The liquid accumulation will have many adverse effects on the insulation material and the metal components of the tank bottom. At the least, the outer tank will be frosted and ice will be hung, and at the worst, the bottom plate of the inner tank will arch and fail. At present, with the increasing number of large-scale butane cryogenic storage tanks in China, accidents caused by condensate in the tanks occur frequently. Due to the special structure of the cryogenic tanks, opening the tanks for inspection involves multiple replacements of the gas in the tanks, which is extremely inconvenient. Each accident will bring great economic losses and safety risks to users. This has almost become a major pain point for this type of butane cryogenic tanks and needs to be solved urgently.

[0004] After searching, the utility model patent with Chinese patent application number CN110454677B discloses a full-containment tank with a non-metallic sealing layer for storing cryogenic media. The tank wall insulation layer includes a first tank wall insulation layer and a second tank wall insulation layer from the outside to the inside. The first tank wall insulation layer extends from the outer tank wall to the upper surface of the outer tank bottom. Through the sealing layer with good liquid tightness and air tightness, the vaporization rate of the cryogenic liquid entering the jacket due to abnormal reasons is limited, the vaporized steam is contained, and the safety of the cryogenic tank is improved.

[0005] The above-mentioned existing technical solution can indeed reduce the insulation loss to a certain extent by limiting the vaporization of low-temperature liquid and containing the vaporized steam through an insulating layer with good liquid tightness and air tightness. However, this structure cannot prevent the condensation of medium evaporated gas in the side wall jacket under the influence of low ambient temperature, and the potential risk of damage to the bottom structure of the inner tank by the condensed accumulated liquid cannot be eliminated. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a low-temperature butane storage tank which can prevent the condensate accumulation from damaging the inner tank bottom.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solution: a low-temperature butane storage tank, comprising an outer tank body and an inner tank body arranged in the outer tank body, and also comprising a partition mechanism arranged between the outer tank body and the inner tank body, and the partition mechanism divides the interval between the outer tank body and the inner tank body into two independent spaces, upper and lower, and the independent space located above is provided with cold-insulating glass wool, and the independent space located below is provided with cold-insulating expanded perlite.

[0008] Furthermore, the partition mechanism includes a first partition plate connected to the inner wall of the outer tank body at one end, a second partition plate connected to the outer wall of the inner tank body at one end, and a plurality of nut and bolt structures that seal the other end of the first partition plate to the other end of the second partition plate, and after the first partition plate is connected to the second partition plate, it is inclined toward the inner tank body.

[0009] Furthermore, the first partition is located on the second partition.

[0010] Furthermore, the first partition plate and the second partition plate each include a plate body and a sealing plate with a low friction coefficient provided on the contact side of the corresponding connecting ends of the plate body;

[0011] The plate body of the first partition and the sealing plate are provided with a plurality of interconnected first circular holes, and the plate body of the second partition and the sealing plate are provided with a plurality of interconnected waist circular holes, and the waist circular holes are arranged along the width direction of the plate body. The plurality of first circular holes and the plurality of waist circular holes correspond one-to-one to a plurality of nut and bolt structures, and the nut and bolt structures achieve a sealed connection by cooperating with the corresponding first circular holes and the waist circular holes.

[0012] Furthermore, the partition mechanism also includes a first gasket that cooperates with the nut and bolt structure and a second gasket with a low friction coefficient, and the first gasket has a second circular hole and contacts the outer side of the first partition, and the second gasket has a third circular hole and contacts the outer side of the second partition.

[0013] Furthermore, the inner tank body is provided with a plurality of drainage ports at corresponding connection positions close to the second partition plate, and a glass fiber layer is provided on the outer wall of the inner tank body at positions corresponding to the drainage ports.

[0014] Furthermore, a replacement air inlet and a replacement air exhaust port are provided on the outer tank body.

[0015] The beneficial effects of the present invention are as follows:

[0016] The low-temperature butane storage tank of the utility model adds a partition mechanism between the outer tank body and the inner tank body, and the original free gas flow space is divided into two in the vertical direction. The evaporated gas is confined to the upper part of the partition mechanism, and the lower part does not have the conditions for generating condensate due to the absence of medium gas, thereby avoiding the risk of condensed liquid flowing to the bottom of the inner tank body and potentially damaging the bottom structure of the inner tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the low-temperature butane storage tank of the utility model;

[0018] Figure 2 yes Figure 1 A magnified view of part A;

[0019] Figure 3 yes Figure 2 A magnified view of part B;

[0020] Figure 4 This is a schematic diagram of the connection between the first partition and the second partition of the utility model.

[0021] The components in the accompanying drawings are marked as follows: 1. Outer tank body; 101. Replacement air inlet; 102. Replacement exhaust port; 2. Inner tank body; 201. Drain port; 3. Partition mechanism; 301. First partition; 3011. Plate body; 3011a. First circular hole; 3012. Sealing plate; 3012a. Waist circular hole; 302. Second partition; 303. Nut and bolt structure; 304. First gasket; 304a. Second circular hole; 305. Second gasket; 305a. Third circular hole; 4. Cold-insulating glass wool; 5. Cold-insulating expanded perlite; 6. Glass fiber layer; A. Independent space. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 .

[0024] The low-temperature butane storage tank of the present invention includes an outer tank body 1 and an inner tank body 2 arranged in the outer tank body 1, and also includes a partition mechanism 3 arranged between the outer tank body 1 and the inner tank body 2, and the partition mechanism 3 divides the interval between the outer tank body 1 and the inner tank body 2 into two independent spaces A, upper and lower, and the upper independent space A is provided with cold-insulating glass wool 4, and the lower independent space A is provided with cold-insulating expanded perlite 5.

[0025] The low-temperature butane storage tank of the present invention adds a partition mechanism 3 between the outer tank body 1 and the inner tank body 2, and the original free gas flow space is divided into two in the vertical direction. The evaporated gas is confined to the upper part of the partition mechanism 3, and the lower part does not have the conditions for generating condensate due to the absence of medium gas, thereby avoiding the risk of condensed liquid flowing to the bottom of the inner tank body 2 and potentially damaging the bottom structure of the inner tank body 2.

[0026] In one embodiment, see Figure 2The partition mechanism 3 includes a first partition 301 connected at one end to the inner wall of the outer tank body 1, a second partition 302 connected at one end to the outer wall of the inner tank body 2, and a plurality of nut and bolt structures 303 that seal the other end of the first partition 301 with the other end of the second partition 302. After the first partition 301 and the second partition 302 are connected, they are inclined toward the inner tank body 2. This design, by tilting the partition mechanism 3, can direct the condensed liquid to flow in one direction, achieving accumulation and collection of the condensed liquid, facilitating subsequent centralized treatment. In this embodiment, the tilted setting forms a 60° angle with the inner tank body 2.

[0027] In one embodiment, see Figure 2 , the first partition 301 is located on the second partition 302. This design prevents the condensed liquid from condensing and flowing into the connection seam between the first partition 301 and the second partition 302.

[0028] In one embodiment, see Figure 3 、 4 The first partition plate 301 and the second partition plate 302 each include a plate body 3011 and a sealing plate 3012 with a low friction coefficient provided on the contact side of the corresponding connection end of the plate body 3011;

[0029] The first partition plate 301 has a plurality of interconnected first circular holes 3011a formed in the plate body 3011 and the sealing plate 3012. The second partition plate 302 has a plurality of interconnected waist-shaped holes 3012a formed in the plate body 3011 and the sealing plate 3012. The waist-shaped holes 3012a are arranged along the width of the plate body 3011. The plurality of first circular holes 3011a and the plurality of waist-shaped holes 3012a correspond one-to-one with the plurality of nut and bolt structures 303. The nut and bolt structures 303 cooperate with the corresponding first circular holes 3011a and waist-shaped holes 3012a to achieve a sealed connection. This design allows the first partition plate 301 and the second partition plate 302 to slide with each other after connection, meeting the requirement that the inner tank body 2 shrinks inward when cooled, while maintaining a good airtight seal even in this shrinking state. In this embodiment, the sealing plate 3012 is a PTFE sealing plate.

[0030] In one embodiment, see Figure 3The partition mechanism 3 further includes a first gasket 304 that cooperates with the nut and bolt structure 303 and a second gasket 305 with a low friction coefficient. The first gasket 304 has a second circular hole 304a and contacts the outside of the first partition 301, while the second gasket 305 has a third circular hole 305a and contacts the outside of the second partition 302. This design ensures that the gasket structure ensures that the nut and bolt structure 303 is tightly connected to the first and second partitions 301 and 302, while also providing a sliding effect. In this embodiment, the second gasket 305 is a non-standard PTFE gasket.

[0031] In one embodiment, see Figure 2 The inner tank body 2 is provided with a plurality of drain ports 201 at locations corresponding to the connection with the second partition 302, and a fiberglass layer 6 is provided on the outer wall of the inner tank body 2 at locations corresponding to the drain ports 201. This design effectively prevents gas from escaping from the inner tank body 2 through the drain ports 201. Furthermore, any gas that condenses within the inner tank body 2 and accumulates on the partition mechanism 3 can be promptly drained back into the inner tank body 2 through the fiberglass layer 6. Furthermore, in this embodiment, the drain ports 201 are positioned above the designed liquid level within the inner tank body 2.

[0032] In one embodiment, see Figure 1 The outer tank body 1 is further provided with a displacement air inlet 101 and a displacement air outlet 102. In this embodiment, the displacement air inlet 101 is provided at an appropriate position as required, and is here provided at the bottom of the outer tank body 1. The displacement air outlet 102 is provided as close as possible to the connection between the first partition 301 and the wall of the outer tank body 1 so that the gas can be completely discharged. The number of displacement air outlets 102 can be determined according to design requirements.

[0033] It should also be noted that foam glass bricks are laid between the bottom of the inner tank body 1 and the bottom of the outer tank body 1 in this application, and other unmentioned parts and structures can adopt the same structure as the butane storage tank in the prior art.

[0034] It should be understood that the examples and implementation methods described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes in which A and B are satisfied at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A low-temperature butane storage tank, comprising an outer tank body (1) and an inner tank body (2) arranged in the outer tank body (1), characterized in that: The invention also includes a partition mechanism (3) arranged between the outer tank body (1) and the inner tank body (2), and the partition mechanism (3) divides the interval between the outer tank body (1) and the inner tank body (2) into two upper and lower independent spaces (A), and the upper independent space (A) is provided with cold-insulating glass wool (4), and the lower independent space (A) is provided with cold-insulating expanded perlite (5).

2. The cryogenic butane storage tank according to claim 1, characterized in that: The partition mechanism (3) comprises a first partition (301) having one end connected to the inner wall of the outer tank body (1), a second partition (302) having one end connected to the outer wall of the inner tank body (2), and a plurality of nut and bolt structures (303) for sealingly connecting the other end of the first partition (301) with the other end of the second partition (302), and the first partition (301) and the second partition (302) are inclined toward the inner tank body (2) after being connected.

3. The cryogenic butane storage tank according to claim 2, characterized in that: The first partition (301) is located on the second partition (302).

4. The cryogenic butane storage tank according to any one of claims 2-3, characterized in that: The first partition plate (301) and the second partition plate (302) both include a plate body (3011) and a sealing plate (3012) with a low friction coefficient provided on the contact side of the corresponding connection end of the plate body (3011); A plurality of interconnected first circular holes (3011a) are provided on the plate body (3011) and the sealing plate (3012), and a plurality of interconnected waist-shaped holes (3012a) are provided on the plate body (3011) and the sealing plate (3012) of the second partition (302), and the waist-shaped holes (3012a) are arranged along the width direction of the plate body (3011). The plurality of first circular holes (3011a) and the plurality of waist-shaped holes (3012a) correspond one-to-one to the plurality of nut and bolt structures (303), and the nut and bolt structures (303) are sealed by cooperating with the corresponding first circular holes (3011a) and the waist-shaped holes (3012a).

5. The cryogenic butane storage tank according to claim 4, characterized in that: The partition mechanism (3) further comprises a first gasket (304) and a second gasket (305) with a low friction coefficient that cooperates with the nut and bolt structure (303), wherein the first gasket (304) is provided with a second circular hole (304a) and contacts the outer side of the first partition (301), and the second gasket (305) is provided with a third circular hole (305a) and contacts the outer side of the second partition (302).

6. The cryogenic butane storage tank according to claim 2, characterized in that: The inner tank body (2) is provided with a plurality of drainage ports (201) at a connection position corresponding to the second partition (302), and a glass fiber layer (6) is provided on the outer wall of the inner tank body (2) at a position corresponding to the drainage ports (201).

7. The cryogenic butane storage tank according to claim 4, characterized in that: The outer tank body (1) is also provided with a replacement air inlet (101) and a replacement air outlet (102).

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