A LNG pipeline pre-cooling device

Abstract

This utility model provides a precooling device for LNG pipelines, including a precooling box with a sealed door hinged to its opening. An air inlet pipe is fixedly installed on one side of the precooling box and connected thereto, while an air outlet pipe is fixedly installed on the other side and connected thereto. Control valves are installed on both the air inlet and outlet pipes. The precooling box contains a placement assembly and an air outlet assembly. Through the cooperation of screws, sliding plates, and sliding rods, the T-shaped placement frame can be synchronously and equidistantly adjusted, allowing for quick adaptation to LNG pipelines of different diameters without frequent replacement or modification of the placement frame. A telescopic rod adjusts the height of the placement assembly, ensuring the LNG pipeline is accurately positioned between the top and bottom frames, guaranteeing uniform application of precooling gas to the pipeline. The first and second diverter blocks ensure that the precooling gas is evenly distributed to the air outlets of the top and bottom frames, achieving simultaneous precooling of the upper and lower ends of the LNG pipeline.

Description

Technical Field

[0001] This utility model relates to the field of pipeline precooling technology, and more specifically, to a precooling device for LNG pipelines. Background Technology

[0002] Pipelines are the pipes that connect pumps, valves, or control systems. During the production of pipelines, pre-cooling is required to facilitate subsequent processing. When pre-cooling existing LNG pipelines before use, a common pre-cooling scheme is to vaporize a portion of the LNG into BOG through an external vaporizer and then introduce it into the pre-cooling box to pre-cool the LNG pipelines placed inside the pre-cooling box.

[0003] Utility model patent application number: CN202223415643.1, discloses an LNG pipeline precooling device, including a precooling box and an adjustment mechanism; the precooling box: its right end has an outlet with a door hinged to it; the upper end of the precooling box has an installation port with a sealing cover; the upper end of the sealing cover has an air inlet connected to the lower end of the air inlet pipe; the right side of the air inlet pipe is connected in series with an air inlet valve; the front end of the precooling box has an exhaust pipe with an exhaust valve connected in series in the middle of the exhaust pipe; the bottom wall of the precooling box has support columns, and the upper end of each support column has a placement rack; the adjustment mechanism: is located inside the sealing cover, and the rear end of the adjustment mechanism is fixedly connected to the front end of the sealing cover. This LNG pipeline precooling device can adjust the angle of the BOG blowout, so that the LNG pipeline is cooled more evenly.

[0004] The adjacent racks for placing LNG pipelines inside the aforementioned patented precooling box adopt a fixed structure design. When faced with LNG pipelines of different diameters, the fixed racks cannot be adjusted to adapt to the pipeline diameter. Operators often need to frequently replace or modify the rack structure according to the pipeline specifications, which reduces the efficiency of the precooling box.

[0005] Therefore, we have made improvements to this and proposed a precooling device for LNG pipelines. Utility Model Content

[0006] The purpose of this utility model is that the existing adjacent placement racks for placing LNG pipelines in the precooling box adopt a fixed structure design. When faced with LNG pipelines of different diameters, the fixed placement racks cannot be adjusted according to the pipeline diameter. Operators often need to frequently replace or modify the placement rack structure according to the pipeline specifications, which reduces the utilization efficiency of the precooling box.

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0008] A precooling device for LNG pipelines includes a precooling box with a sealed door hinged to its opening. An air inlet pipe is fixedly installed on one side of the precooling box and connected thereto, and an air outlet pipe is fixedly installed on the other side of the precooling box and connected thereto. Control valves are installed on both the air inlet and outlet pipes. The precooling box contains a placement assembly and an air outlet assembly. The placement assembly includes lifting plates on both sides inside the precooling box, a lifting bar is fixedly installed between the two lifting plates, and multiple synchronously moving T-shaped placement racks are slidably engaged on both lifting plates.

[0009] Furthermore, two columns located on both sides of the lifting bar are installed between the bottom and top walls of the precooling box. Connecting blocks that slide with the columns are installed on both sides of the lifting bar. A telescopic rod is installed on the bottom wall of the precooling box, and the telescopic end of the telescopic rod is fixedly connected to the bottom of the lifting bar.

[0010] Furthermore, the middle of the lifting bar is rotatably fitted with a screw that extends into the lifting plates on both sides, and one end of the screw with an operating handle extends through the outer side of the lifting plate near the sealed box door.

[0011] Furthermore, the lifting plate has a sliding groove inside, and a displacement groove communicating with the sliding groove is opened on the upper side of the lifting plate downward. A sliding rod is installed between the inner walls of the two sides of the displacement groove.

[0012] Furthermore, the slide groove has a sliding plate inside, the middle of the sliding plate has a threaded groove that engages with the screw thread, and the side of the bottom longitudinal block of the T-shaped placement frame has a sliding hole that engages with the slide rod.

[0013] Furthermore, the bottom of the longitudinal block at the bottom of the T-shaped placement rack is equipped with a connecting post, and the upper side of the slide plate is provided with a plurality of grooves that cooperate with the connecting post. The central axis of the groove is inclined and is divided into two groups arranged symmetrically, and the distance between the ends of the central axis of each two adjacent grooves is the same.

[0014] Furthermore, the air outlet assembly includes an air outlet frame body composed of a vertical frame, a top frame, and a bottom frame connected together. The air inlet pipe is installed on one side of the vertical frame and connected thereto. Multiple air outlets are opened on opposite sides of the top frame and the bottom frame. The placement assembly is located between the top frame and the bottom frame.

[0015] Furthermore, the inner wall of the upright frame is equipped with a first diversion block with a central protrusion, and the connection between the upright frame and the top frame and the bottom frame is equipped with a second diversion block.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model achieves synchronous and equidistant adjustment of the T-shaped placement rack through the cooperation of screw, sliding plate, sliding rod and other structures. It can quickly adapt to LNG pipelines of different diameters without frequent replacement or modification of the placement rack, thus improving the utilization efficiency of the precooling box. The telescopic rod can adjust the height of the placement components so that the LNG pipeline can be accurately positioned between the top frame and the bottom frame, ensuring that the precooling gas acts evenly on the pipeline.

[0018] 2. By setting up the first and second diversion blocks, the precooling gas is evenly distributed to the air outlets of the top and bottom frames, realizing simultaneous precooling of the upper and lower ends of the LNG pipeline, solving the problem of uneven precooling. The air outlets of the top and bottom frames are set opposite each other to ensure that the gas acts directly on the pipeline from the upper and lower sides, improving the precooling efficiency and uniformity, and reducing the deformation and cracking of the pipeline due to uneven precooling. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a precooling device for LNG pipelines according to the present invention;

[0020] Figure 2 This is a schematic diagram of the internal components of the precooling box of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the two lifting plates connected in this utility model;

[0022] Figure 4 This is an exploded structural diagram of the internal components of the lifting plate of this utility model;

[0023] Figure 5 This is a side sectional view of the air outlet component of this utility model.

[0024] Figure 6 This is a front sectional view of the air outlet component of this utility model.

[0025] The image shows:

[0026] 1. Precooling box; 2. Sealed box door; 3. Air inlet duct; 4. Air outlet duct; 5. Control valve; 6. Placement assembly; 601. Lifting plate; 602. Lifting bar; 603. Column; 604. Connecting block; 605. Telescopic rod; 606. Screw; 607. Slide groove; 608. Displacement groove; 609. Slide rod; 610. Slide plate; 611. T-shaped placement rack; 612. Slide hole; 613. Connecting column; 614. Groove; 615. Threaded groove; 7. Air outlet assembly; 701. Vertical frame; 702. Top frame; 703. Bottom frame; 704. Air outlet; 705. First diversion block; 706. Second diversion block. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0028] Please refer to Figure 1-6 A precooling device for LNG pipelines includes a precooling box 1, a sealed box door 2 hinged to the opening of the precooling box 1, an air inlet pipe 3 fixedly installed on one side of the precooling box 1 and connected thereto, and an air outlet pipe 4 fixedly installed on the other side of the precooling box 1 and connected thereto. Control valves 5 are installed on both the air inlet pipe 3 and the air outlet pipe 4. The interior of the precooling box 1 is provided with a placement assembly 6 and an air outlet assembly 7. The placement assembly 6 includes lifting plates 601 arranged on both sides inside the precooling box 1. Lifting bars 602 are fixedly installed between the two lifting plates 601. Multiple synchronously moving T-shaped placement racks 611 are slidably engaged on both lifting plates 601.

[0029] Please refer to Figure 2-4 Two columns 603 are installed between the bottom and top walls of the precooling box 1, located on both sides of the lifting bar 602. Connecting blocks 604 that slide with the columns 603 are installed on both sides of the lifting bar 602. A telescopic rod 605 is installed on the bottom wall of the precooling box 1. The telescopic end of the telescopic rod 605 is fixedly connected to the bottom of the lifting bar 602. A screw 606, which penetrates into the lifting plates 601 on both sides, is rotatably fitted in the middle of the lifting bar 602. One end of the screw 606, with an operating handle, passes through the sealing door 2. On the outer side of the side lifting plate 601, a sliding groove 607 is provided inside the lifting plate 601. A displacement groove 608 communicating with the sliding groove 607 is provided on the upper side of the lifting plate 601. A sliding rod 609 is installed between the inner walls of the two sides of the displacement groove 608. A sliding plate 610 is slidably fitted inside the sliding groove 607. A threaded groove 615 that is threadedly fitted with the screw 606 is provided in the middle of the sliding plate 610. A sliding hole 612 that is slidably fitted with the sliding rod 609 is provided on the side of the bottom longitudinal block of the T-shaped placement rack 611. The two lifting plates 601 have the same internal structure, which allows the T-shaped placement rack 611 above them to move synchronously and equidistantly for adjustment to accommodate LNG pipelines of different diameters. The bottom of the longitudinal block at the bottom of the T-shaped placement rack 611 is equipped with a connecting column 613. The upper side of the sliding plate 610 has multiple grooves 614 that cooperate with the connecting column 613. The central axis of the grooves 614 is inclined and divided into two groups that are symmetrically arranged. The distance between the ends of the central axis of each two adjacent grooves 614 is the same.

[0030] Specifically, when it is necessary to adapt to LNG pipelines of different diameters, the operator turns the operating handle of the screw 606. The screw 606 rotates in the slide groove 607 within the lifting plate 601. Since the threaded groove 615 of the sliding plate 610 is threadedly engaged with the screw 606, the sliding plate 610 slides along the slide groove 607. When the sliding plate 610 slides, it drives the connecting column 613 to move in the groove 614. The sliding hole 612 at the bottom of the T-shaped placement bracket 611 fits onto the sliding rod 609, so that the T-shaped placement bracket 611 can only move horizontally along the sliding rod 609. Because the internal structures of the two lifting plates 601 are the same, the sliding plates 610 on both sides move synchronously when the screw 606 rotates, thereby driving the T-shaped placement brackets 611 on both sides to move synchronously and equidistantly, realizing the adjustment of the clamping space for LNG pipelines of different diameters. The telescopic rod 605 can drive the lifting bar 602 to move up and down by extending and retracting, thereby adjusting the height of the entire placement assembly 6, so that the LNG pipeline is in the appropriate position in the precooling box 1.

[0031] Please refer to Figure 5 and Figure 6 The air outlet assembly 7 includes an air outlet frame body composed of a vertical frame 701, a top frame 702, and a bottom frame 703 connected together. The air inlet pipe 3 is installed on one side of the vertical frame 701 and connected to it. Multiple air outlets 704 are provided on the opposite sides of the top frame 702 and the bottom frame 703. The placement assembly 6 is located between the top frame 702 and the bottom frame 703. A first diverter block 705 with a central protrusion is installed on the inner wall of the vertical frame 701. A second diverter block 706 is installed at the connection between the vertical frame 701 and the top frame 702 and the bottom frame 703.

[0032] Specifically, the precooling gas enters the vertical frame 701 through the air inlet pipe 3 and encounters the first diversion block 705. The gas is initially divided into two parts, upward and downward. The upward gas passes through the second diversion block 706 at the connection between the vertical frame 701 and the top frame 702 and is evenly distributed to multiple air outlets 704 of the top frame 702, blowing towards the upper end of the LNG pipeline. The downward gas passes through the second diversion block 706 at the connection between the vertical frame 701 and the bottom frame 703 and is evenly distributed to multiple air outlets 704 of the bottom frame 703, blowing towards the lower end of the LNG pipeline. The air outlet pipe 4 is used to discharge the gas during the precooling process. The control valve 5 can adjust the flow rate of the air inlet and outlet to maintain the stable gas pressure inside the precooling box 1.

[0033] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present utility model.

Claims

1. A precooling device for LNG pipelines, comprising a precooling box (1), characterized in that: The precooling box (1) has a sealed door (2) hinged at its opening. An air inlet pipe (3) connected to the precooling box (1) is fixedly installed on one side. An air outlet pipe (4) connected to the precooling box (1) is fixedly installed on the other side. A control valve (5) is installed on both the air inlet pipe (3) and the air outlet pipe (4). The precooling box (1) is equipped with a placement assembly (6) and an air outlet assembly (7). The placement assembly (6) includes lifting plates (601) on both sides inside the precooling box (1). A lifting bar (602) is fixedly installed between the two lifting plates (601). Multiple synchronously moving T-shaped placement racks (611) are slidably fitted on both lifting plates (601).

2. The precooling device for LNG pipelines according to claim 1, characterized in that: The precooling box (1) is provided with two columns (603) located on both sides of the lifting bar (602) between the bottom wall and the top wall. Both sides of the lifting bar (602) are provided with connecting blocks (604) that slide with the columns (603). The bottom wall of the precooling box (1) is provided with a telescopic rod (605), and the telescopic end of the telescopic rod (605) is fixedly connected to the bottom of the lifting bar (602).

3. A precooling device for LNG pipelines according to claim 2, characterized in that: The middle part of the lifting bar (602) is rotatably fitted with a screw (606) that passes through the lifting plates (601) on both sides. One end of the screw (606) with an operating handle passes through the outside of the lifting plate (601) near the sealed box door (2).

4. A precooling device for LNG pipelines according to claim 3, characterized in that: The lifting plate (601) has a sliding groove (607) inside, and a displacement groove (608) communicating with the sliding groove (607) is provided on the upper side of the lifting plate (601). A sliding rod (609) is installed between the inner walls of the two sides of the displacement groove (608).

5. A precooling device for LNG pipelines according to claim 4, characterized in that: The slide groove (607) has a sliding plate (610) inside, and the middle part of the sliding plate (610) has a threaded groove (615) that is threaded with the screw (606). The side of the bottom longitudinal block of the T-shaped placement frame (611) has a sliding hole (612) that is slidably engaged with the slide rod (609).

6. A precooling device for LNG pipelines according to claim 5, characterized in that: The bottom of the longitudinal block of the T-shaped placement rack (611) is equipped with a connecting post (613). The upper side of the slide plate (610) is provided with a plurality of grooves (614) that cooperate with the connecting post (613). The central axis of the groove (614) is inclined and is divided into two groups arranged symmetrically. The distance between the ends of the central axis of each two adjacent grooves (614) is the same.

7. A precooling device for LNG pipelines according to claim 1, characterized in that: The air outlet assembly (7) includes an air outlet frame body composed of a vertical frame (701), a top frame (702) and a bottom frame (703) connected together. The air inlet pipe (3) is installed on one side of the vertical frame (701) and connected to it. Multiple air outlets (704) are opened on the opposite sides of the top frame (702) and the bottom frame (703). The placement assembly (6) is located between the top frame (702) and the bottom frame (703).

8. A precooling device for LNG pipelines according to claim 7, characterized in that: The inner wall of the upright frame (701) is equipped with a first diversion block (705) with a central protrusion, and a second diversion block (706) is installed at the connection between the upright frame (701) and the top frame (702) and the bottom frame (703).

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