Nitrogen replacement outlet structure of inner tank of large low-temperature storage tank

Abstract

The utility model provides a large -scale low temperature storage tank inner tank nitrogen replacement outlet structure, reduces economic cost, makes things convenient for daily inspection, has effectively improved the safety and reliability of storage tank. The utility model discloses low temperature storage tank roof, exhaust valve, vertical tube, exhaust pipe, arc pipe, suspension support and center ring pipe, suspension support sets up in the inboard of low temperature storage tank roof, and it is fixed in low temperature storage tank roof, vertical tube passes through low temperature storage tank roof vertically, and its upper end is located in the outboard of low temperature storage tank roof, and is connected with one end of exhaust valve, and the lower end is located in the inboard of low temperature storage tank roof, the other end of exhaust valve is connected with exhaust pipe, the lower end of vertical tube is connected with one end of arc pipe, and the other end of arc pipe is connected with center ring pipe, arc pipe sets up in the inboard of low temperature storage tank roof, and arc pipe is installed on suspension support, center ring pipe sets up below the inboard of low temperature storage tank roof center position, and center ring pipe is installed on suspension support, and center ring pipe is equipped with vent hole.

Description

Technical Field

[0001] This utility model relates to a nitrogen replacement outlet structure for the inner tank of a large cryogenic storage tank, which is suitable for large atmospheric pressure cryogenic storage tanks storing cryogenic media, such as LNG, liquid ethylene, liquid propylene, liquid ammonia and other cryogenic storage tanks. Background Technology

[0002] More and more cryogenic storage tanks are being used in the energy and petrochemical industries. These tanks often employ a double-layer structure, with the inner and outer tanks separated by insulation materials such as glass bricks, expanded perlite, and glass wool. After the tank construction and installation are completed, before putting it into operation, the tank must be purged with nitrogen to ensure that the air inside is completely removed, reducing safety hazards such as oxidation, corrosion, and even explosions. This also ensures the insulation effect of the insulation materials between the inner and outer tanks.

[0003] Currently, most nitrogen replacement outlets for storage tanks are located in the center of the tank. Due to daily inspection work, inspection walkways and platforms need to be set up, resulting in a waste of resources. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned shortcomings in the existing technology and provide a nitrogen replacement outlet structure for the inner tank of a large cryogenic storage tank with a reasonable structural design, which reduces economic costs, facilitates daily inspections, and effectively improves the safety and reliability of the storage tank.

[0005] The technical solution adopted by this utility model to solve the above problems is: a nitrogen replacement outlet structure for the inner tank of a large cryogenic storage tank, including the top of the cryogenic storage tank, characterized in that: it also includes an exhaust valve, a vertical pipe, an exhaust pipe, an arc-shaped pipe, a suspension support, and a central ring pipe; the suspension support is set on the inner side of the top of the cryogenic storage tank and is fixed to the top of the cryogenic storage tank; the vertical pipe passes vertically through the top of the cryogenic storage tank, with its upper end located on the outer side of the top of the cryogenic storage tank and connected to one end of the exhaust valve, and its lower end located on the inner side of the top of the cryogenic storage tank; the other end of the exhaust valve is connected to the exhaust pipe; the lower end of the vertical pipe is connected to one end of the arc-shaped pipe, and the other end of the arc-shaped pipe is connected to the central ring pipe; the arc-shaped pipe is set on the inner side of the top of the cryogenic storage tank and is installed on the suspension support; the central ring pipe is set on the inner side below the center of the top of the cryogenic storage tank and is installed on the suspension support, and the central ring pipe is provided with a vent hole.

[0006] This utility model also includes an elbow, through which the lower end of the vertical pipe is connected to one end of the arc-shaped pipe.

[0007] The elbows described in this utility model include a 90° elbow and a 22.5° elbow. The lower end of the vertical pipe is connected to one end of the 90° elbow, the other end of the 90° elbow is connected to one end of the 22.5° elbow, and the other end of the 22.5° elbow is connected to the arc-shaped pipe.

[0008] This utility model also includes a gas detection valve, which is connected to the vertical pipe.

[0009] This utility model also includes a support plate, which is fixed to the vertical pipe and the top of the cryogenic storage tank.

[0010] The exhaust pipe described in this utility model leads to the operating platform next to the cryogenic storage tank.

[0011] The central ring tube of this utility model includes an annular tube and a cross tube, with the cross tube fixed in the middle of the annular tube and connected to the annular tube.

[0012] Compared with the prior art, this utility model has the following advantages and effects: This utility model has a simple structure, is easy to install and operate, effectively solves the problem of setting up nitrogen replacement discharge ports for large cryogenic storage tanks, reduces economic costs, facilitates daily inspections, and effectively improves the safety and reliability of the storage tank. Attached Figure Description

[0013] Figure 1 This is a side view structural diagram of an embodiment of the present utility model.

[0014] Figure 2 This is a bottom view of the structure of an embodiment of the present invention. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0016] This utility model embodiment includes a cryogenic storage tank top 1, an exhaust valve 2, a vertical pipe 3, a support plate 4, an exhaust pipe 5, an arc-shaped pipe 7, an elbow, a suspension support 8, a central ring pipe 9, and a gas detection valve 11.

[0017] The top of the cryogenic storage tank can be in the form of a spherical dome.

[0018] The suspension support 8 is located inside the top 1 of the cryogenic storage tank. Its upper part is fixed to the top 1 of the cryogenic storage tank, and its lower part is used to support the arc-shaped pipe 7 and the central ring pipe 9.

[0019] The vertical pipe 3 is a steel circular pipe that passes vertically through the top 1 of the cryogenic storage tank. The upper end of the vertical pipe 3 is located outside the top 1 of the cryogenic storage tank and is connected to one end of the exhaust valve 2. The lower end of the vertical pipe 3 is located inside the top 1 of the cryogenic storage tank. The other end of the exhaust valve 2 is connected to the exhaust pipe 5.

[0020] The lower end of the vertical pipe 3 is connected to one end of the arc-shaped pipe 7 via an elbow, and the other end of the arc-shaped pipe 7 is connected to the central ring pipe 9. In this embodiment, the elbow includes a 90° elbow 5 and a 22.5° elbow 6. The lower end of the vertical pipe 3 is connected to one end of the 90° elbow 5, the other end of the 90° elbow 5 is connected to one end of the 22.5° elbow 6, and the other end of the 22.5° elbow 6 is connected to the arc-shaped pipe 7. The curvature of the arc-shaped pipe 7 matches the curvature of the top 1 of the cryogenic storage tank.

[0021] The support plate 4 is fixed to the vertical pipe 3 and the top of the cryogenic storage tank 1, and the vertical pipe 3 is fixed by the support plate 4.

[0022] The arc-shaped pipe 7 is located inside the top 1 of the cryogenic storage tank. The arc-shaped pipe 7 is installed on the suspension support 8 and fixed by the suspension support 8. The arc-shaped pipe 7 is made of pressed steel circular pipe.

[0023] The central ring pipe 9 is located on the inner side below the center of the top 1 of the cryogenic storage tank. The central ring pipe 9 is mounted on the suspension support 8 and fixed by the suspension support 8. The upper part of the central ring pipe 9 is provided with a vent hole 10. The central ring pipe 9 includes an annular pipe 12 and a cross pipe 13. The cross pipe 13 is fixed in the middle of the annular pipe 12 and is connected to the annular pipe 12, which can more evenly and quickly release gas.

[0024] The gas detection valve 11 is connected to the vertical pipe 3, and the gas content in the tank can be detected through the gas detection valve 11.

[0025] Gas inside the cryogenic storage tank enters through the vent 10 of the central ring pipe 9 and exits along the central ring pipe 9, the arc-shaped pipe 7, the elbow and vertical pipe 3, the exhaust valve 2, and the exhaust pipe 5. The exhaust rate can be controlled by the exhaust valve 2. This invention effectively solves the problem of nitrogen replacement and emission from the inner tank. Furthermore, the exhaust pipe 5 can be led to the operating platform next to the cryogenic storage tank, eliminating the need for additional walkways and platforms leading to the center of the tank, reducing investment, and facilitating daily inspection and maintenance.

[0026] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, all of which should fall within the protection scope of this utility model.

Claims

1. A nitrogen replacement outlet structure for the inner tank of a large cryogenic storage tank, comprising the tank top, characterized in that: It also includes an exhaust valve, a vertical pipe, an exhaust pipe, an arc-shaped pipe, a suspension support, and a central ring pipe; the suspension support is located inside the top of the cryogenic storage tank and is fixed to the top of the cryogenic storage tank; the vertical pipe passes vertically through the top of the cryogenic storage tank, with its upper end located outside the top of the cryogenic storage tank and connected to one end of the exhaust valve, and its lower end located inside the top of the cryogenic storage tank; the other end of the exhaust valve is connected to the exhaust pipe; the lower end of the vertical pipe is connected to one end of the arc-shaped pipe, and the other end of the arc-shaped pipe is connected to the central ring pipe; the arc-shaped pipe is located inside the top of the cryogenic storage tank and is installed on the suspension support; the central ring pipe is located below and inside the center of the top of the cryogenic storage tank and is installed on the suspension support, and the central ring pipe is provided with a vent hole.

2. The nitrogen replacement outlet structure of the inner tank of the large cryogenic storage tank according to claim 1, characterized in that: It also includes elbows, where the lower end of the vertical pipe is connected to one end of the curved pipe via an elbow.

3. The nitrogen replacement outlet structure of the inner tank of the large cryogenic storage tank according to claim 2, characterized in that: The elbows include 90° elbows and 22.5° elbows. The lower end of the vertical pipe is connected to one end of the 90° elbow, the other end of the 90° elbow is connected to one end of the 22.5° elbow, and the other end of the 22.5° elbow is connected to the arc-shaped pipe.

4. The nitrogen replacement outlet structure of the inner tank of the large cryogenic storage tank according to claim 1, characterized in that: It also includes a gas detection valve, which is connected to the vertical pipe.

5. The nitrogen replacement outlet structure of the inner tank of the large cryogenic storage tank according to claim 1, characterized in that: It also includes a support plate, which is fixed to the vertical pipe and the top of the cryogenic storage tank.

6. The nitrogen replacement outlet structure of the inner tank of the large cryogenic storage tank according to claim 1, characterized in that: The exhaust pipe leads to the operating platform next to the cryogenic storage tank.

7. The nitrogen replacement outlet structure of the inner tank of the large cryogenic storage tank according to claim 1, characterized in that: The central ring tube includes an annular tube and a cross tube, with the cross tube fixed in the middle of the annular tube and connected to the annular tube.

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