High-temperature high-pressure austenitic stainless steel special-shaped pipe for LNG

Abstract

This application discloses an austenitic stainless steel shaped tube for high-temperature and high-pressure LNG, comprising a shaped tube body, a connecting block, a slot, an impact-resistant plate, an energy-absorbing pad, a reinforcing plate, a reinforcing frame, and a set of U-shaped plates. A connecting block is fixedly connected to the corner of the inner wall of the shaped tube body. A slot is formed on one side of the connecting block, and an impact-resistant plate is inserted into the inner wall of the slot. An energy-absorbing pad is fixedly connected to the side of the impact-resistant plate near the inner wall of the shaped tube body. The bottom side of the connecting block is arc-shaped. This device, through the cooperation of the impact-resistant plate and the energy-absorbing pad, can disperse the impact force of the LNG medium inside the shaped tube body tangentially, thereby preventing the impact force of the LNG medium flow from directly acting on the corner, reducing the inducing factors of stress generation from the source, avoiding stress concentration at the corner, and preventing micro-cracks from forming at the corner due to repeated impacts, thus preventing leakage.

Description

Technical Field

[0001] This application relates to the field of liquefied natural gas transmission pipeline technology, and in particular to austenitic stainless steel profiled pipes for high-temperature and high-pressure LNG. Background Technology

[0002] Natural gas transportation uses austenitic stainless steel shaped pipes, which undergo cryogenic treatment to maintain excellent performance in a wide temperature range of -162℃ to 150℃. They can withstand high-pressure transportation environments of 10-30MPa. The shaped pipes, with their rectangular, trapezoidal and other non-circular cross-section designs, can directly adapt to the turning and diversion requirements in complex pipeline layouts, reduce the use of elbows, tees and other connectors, reduce system pressure loss and reduce energy consumption in natural gas transportation.

[0003] When using existing stainless steel shaped pipes, stress concentration easily occurs at the corners when subjected to the impact of high-temperature and high-pressure LNG media. This stress concentration causes the actual stress at the corners to far exceed that of the straight pipe sections. Under the long-term impact of the pulsating pressure generated by the flow of the medium during LNG transportation, the micro-cracks at the corners will gradually expand, which may lead to leakage. To address this issue, we propose austenitic stainless steel shaped pipes for high-temperature and high-pressure LNG to solve the above problems. Utility Model Content

[0004] The purpose of this application is to provide austenitic stainless steel shaped pipes for high-temperature and high-pressure LNG, which solves the problem that when stainless steel shaped pipes are used, stress concentration easily occurs at the corners when subjected to the impact of high-temperature and high-pressure LNG media. This stress concentration causes the actual stress at the corners to be far greater than that of the straight pipe sections. Under the long-term impact of the pulsating pressure generated by the flow of the medium during LNG transportation, the micro-cracks at the corners will gradually expand, which may lead to leakage.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-temperature and high-pressure LNG austenitic stainless steel shaped tube includes a shaped tube body, a connecting block, a slot, an impact-resistant plate, an energy-absorbing pad, a reinforcing plate, a reinforcing frame, and a set of U-shaped plates. The connecting block is fixedly connected to the corner of the inner wall of the shaped tube body. A slot is opened on one side of the connecting block. An impact-resistant plate is inserted into the inner wall of the slot. An energy-absorbing pad is fixedly connected to the side of the impact-resistant plate near the inner wall of the shaped tube body.

[0007] In a further embodiment, one side of the bottom end of the connecting block is arc-shaped.

[0008] In a further embodiment, the bottom end of the impact-resistant plate is hinged to the upper surface of the reinforcing plate, and one end of the reinforcing plate is connected to the inner wall of the irregular tube body.

[0009] In a further embodiment, the outer surface of the irregular tube body is connected to the inner surface of the reinforcing frame.

[0010] In a further embodiment, the outer surface of a group of U-shaped plates is connected to the outer surface of the shaped tube body, and the other end of each U-shaped plate is connected to the outer surface of the reinforcing frame.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This application, through the combination of the anti-impact plate and the energy-absorbing pad, can disperse the impact force of the LNG medium inside the irregularly shaped pipe body along the tangential direction, thereby preventing the impact force of the LNG medium flow from acting directly on the corner, reducing the causes of stress generation from the source, avoiding stress concentration at the corner, and preventing micro-cracks from forming at the corner due to repeated impacts, so as to avoid leakage. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the austenitic stainless steel shaped tube for high-temperature and high-pressure LNG.

[0014] Figure 2 This is a three-dimensional structural schematic diagram of the orthographic section of the austenitic stainless steel shaped tube for high-temperature and high-pressure LNG.

[0015] Figure 3 This is a three-dimensional structural diagram of the reinforcing frame of an austenitic stainless steel shaped tube for high-temperature and high-pressure LNG.

[0016] In the diagram: 1. Irregular tube body; 2. Connecting block; 3. Slot; 4. Impact-resistant plate; 5. Energy-absorbing pad; 7. Reinforcing plate; 8. Reinforcing frame; 9. U-shaped plate. Detailed Implementation

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-3 In this utility model, the austenitic stainless steel special-shaped tube for high temperature and high pressure LNG includes a special-shaped tube body 1, a connecting block 2, a slot 3, an impact-resistant plate 4, an energy-absorbing pad 5, a reinforcing plate 7, a reinforcing frame 8, and a set of U-shaped plates 9. The connecting block 2 is fixedly connected to the corner of the inner wall of the special-shaped tube body 1. One side of the bottom end of the connecting block 2 is arc-shaped. By setting its bottom to be arc-shaped, the LNG medium can flow smoothly without obstructing its flow.

[0020] A slot 3 is provided on one side of the connecting block 2. An anti-impact plate 4 is inserted into the inner wall of the slot 3. The slot 3 can stabilize the position of the anti-impact plate 4 and allow it to have a certain range of motion. This can disperse the impact force of the LNG medium inside the shaped tube body 1 along the tangential direction, thereby preventing the impact force of the LNG medium flow from acting directly on the corner. This reduces the causes of stress generation from the source, avoids stress concentration at the corner, and prevents micro-cracks from forming at the corner due to repeated impacts, thus avoiding leakage. An energy-absorbing pad 5 is fixedly connected to the side of the anti-impact plate 4 near the inner wall of the shaped tube body 1. The energy-absorbing pad 5 can further absorb the impact force efficiently, reducing the instantaneous stress peak at the corner and preventing stress concentration at the corner.

[0021] The bottom end of the shock-resistant plate 4 is hinged to the upper surface of the reinforcing plate 7. One end of the reinforcing plate 7 is connected to the inner wall of the shaped tube body 1. The reinforcing plate 7 can be used to reinforce and stabilize the bottom end of the shock-resistant plate 4, thereby ensuring the shock-resistant plate 4's effect on LNG medium.

[0022] The outer surface of the shaped tube body 1 is connected to the inner surface of the reinforcing frame 8. The reinforcing frame 8 can be used to strengthen and protect the outer corner of the shaped tube body 1, thereby improving the structural stability of the shaped tube body 1 under high temperature and high pressure environment. The outer surface of a set of U-shaped plates 9 is connected to the outer surface of the shaped tube body 1, and the other end of each U-shaped plate 9 is connected to the outer surface of the reinforcing frame 8. The U-shaped plates 9 can not only connect and stabilize the reinforcing frame 8, but also reinforce the inner corner of the shaped tube body 1, effectively preventing plastic deformation or crack propagation at the inner and outer corners.

[0023] The working principle of this application is as follows: When the LNG medium inside the shaped pipe body 1 flows to the corner, the anti-impact plate 4, which is pre-installed on the inner side of the corner, will first come into contact with the LNG medium. Its arc-shaped surface can disperse the impact force of the LNG medium along the tangential direction, thereby reducing the impact force transmitted to the corner of the shaped pipe body 1. This can prevent the impact force of the LNG medium flow from acting directly on the corner, reducing the cause of stress generation from the source. At the same time, after being impacted, the anti-impact plate 4 will squeeze the energy-absorbing pad 5 to the inner side of the corner. The energy-absorbing pad 5 will efficiently absorb the impact force, reducing the instantaneous stress peak at the corner. This can prevent stress concentration at the corner and prevent micro-cracks from forming at the corner due to repeated impacts, thus avoiding leakage.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An austenitic stainless steel special-shaped pipe for high-temperature high-pressure LNG, characterized by: The device includes a shaped tube body (1), a connecting block (2), a slot (3), an impact-resistant plate (4), an energy-absorbing pad (5), a reinforcing plate (7), a reinforcing frame (8), and a set of U-shaped plates (9). The connecting block (2) is fixedly connected to the corner of the inner wall of the shaped tube body (1). A slot (3) is provided on one side of the connecting block (2). An impact-resistant plate (4) is inserted into the inner wall of the slot (3). An energy-absorbing pad (5) is fixedly connected to the side of the impact-resistant plate (4) near the inner wall of the shaped tube body (1).

2. The high temperature high pressure austenitic stainless steel special-shaped tube for LNG according to claim 1, characterized in that: One side of the bottom end of the connecting block (2) is arc-shaped.

3. The high temperature high pressure austenitic stainless steel special-shaped tube for LNG according to claim 1, characterized in that: The bottom end of the impact-resistant plate (4) is hinged to the upper surface of the reinforcing plate (7), and one end of the reinforcing plate (7) is connected to the inner wall of the shaped tube body (1).

4. The high temperature high pressure austenitic stainless steel special-shaped tube for LNG according to claim 1, characterized in that: The outer surface of the irregular tube body (1) is connected to the inner surface of the reinforcing frame (8).

5. The high temperature high pressure austenitic stainless steel special-shaped tube for LNG according to claim 1, characterized in that: The outer surface of a group of U-shaped plates (9) is connected to the outer surface of the shaped tube body (1), and the other end of each U-shaped plate (9) is connected to the outer surface of the reinforcing frame (8).

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