Large air cooling device for BOG compressor of LNG receiving station

Abstract

The large air cooling device for the BOG compressor of the LNG receiving station comprises a support, a cooling fan and a heat exchange pipe, a fixing frame is installed on the heat exchange pipe, side supporting plates are arranged on the two sides of the fixing frame, extensible blocking pieces are arranged on the two sides, right corresponding to the air outlet direction of the cooling fan, of the fixing frame, and the side supporting plates are arranged on the two sides of the fixing frame. The blocking pieces have the blocking state of blocking one side of the heat exchange tube after being unfolded and the storage state, the two side supporting plates are each provided with a driving component connected with the two blocking pieces, the two side supporting plates are each provided with a pressing sealing assembly, and a pressing linkage assembly is connected between the pressing sealing assemblies and the driving components. The side walls of the adjacent side supporting plates and the side walls of the blocking pieces are pressed by the pressing and sealing assemblies to form sealing and form a cooling groove, and a water injection pipe is arranged over the cooling groove. The emergency cooling device has the following advantages and effects that emergency cooling can be realized, and time is bought for maintenance of the device, so that normal operation of the system is ensured, and potential safety hazards are reduced.

Description

Technical Field

[0001] This invention relates to the field of BOG compression technology, and in particular to a large air-cooled device for BOG compressors in LNG receiving terminals. Background Technology

[0002] LNG is short for liquefied natural gas. The main function of an LNG receiving terminal is to receive, store, and regasify LNG and supply it to gas-fired power plants and city users via natural gas pipelines. LNG is a cryogenic liquid. Although storage tanks have good insulation properties, heat inevitably enters the tanks during storage, causing LNG to evaporate and form boil-off gas (BOG). This BOG needs to be treated promptly. LNG receiving terminals generally use direct discharge and recondensation processes to handle BOG. ​​There is no fundamental difference between the two processes; the only difference lies in the treatment of the evaporated gas through the evaporation gas treatment system.

[0003] The evaporative gas handling system mainly consists of a BOG compressor, a recondenser, and an evaporative gas pipeline system. The BOG compressor is the key equipment for BOG handling, and its function is to process excess evaporative gas and maintain a constant pressure inside the LNG storage tank. Since the gas compressed by the BOG compressor is generally a hydrocarbon gas, and hydrocarbon gases are flammable and explosive, the temperature inside the BOG compressor must be kept low in order to reduce the temperature of the hydrocarbon gas. Current technology generally uses water cooling, but water cooling has significant limitations, is more complicated to install and maintain, and is more expensive, making it unsuitable for widespread installation in all BOG compressors.

[0004] Through continuous research and development by those skilled in the art, air-cooled devices for cooling BOG compressors have emerged on the market. Currently, existing air-cooled devices mainly use a structure combining heat exchange tubes and cooling fans to achieve cooling. Specifically, BOG gas is passed through the heat exchange tubes to achieve heat exchange and cooling. However, given that liquefied natural gas is a hazardous gas, if the cooling fan malfunctions during operation, causing the air-cooled device to fail, the overheated BOG compressor will trigger a series of chain reactions. This will not only affect the normal operation of the system but also pose a significant safety hazard. Therefore, this improved solution was developed to address the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a large-scale air-cooled device for BOG compressors in LNG receiving terminals. This air-cooled device can achieve emergency cooling, buy time for device maintenance, thereby ensuring the normal operation of the system and reducing potential safety hazards.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a large air-cooled device for a BOG compressor in an LNG receiving station, comprising a support frame and a cooling fan and a heat exchange tube mounted on the support frame. The cooling fan is disposed on one side of the heat exchange tube, and a fixed frame with an upward-facing opening and a U-shape is mounted on the heat exchange tube. The fixed frame has side support plates on both sides, and extendable blocking members are provided on both sides of the fixed frame corresponding to the air outlet direction of the cooling fan. The side support plates and blocking members are arranged in a cross shape. The blocking members have… The device can be in both a blocked state (when unfolded) and a retracted state (when blocked on one side of the heat exchange tube). Both side support plates are equipped with driving components that connect the two blocking components. Both side support plates are equipped with pressing and sealing assemblies for sealing the side walls of adjacent side support plates and the side walls of the blocking components. A pressing linkage assembly is connected between the pressing and sealing assembly and the driving component. When the blocking component is in the blocked state, the pressing and sealing assembly presses the side walls of adjacent side support plates and the side walls of the blocking components to form a seal and create a cooling groove surrounding the heat exchange tube. A water injection pipe is located directly above the cooling groove.

[0007] By adopting the above technical solution, when the blocking component is in the retracted state, the cooling airflow blown by the cooling fan can pass normally through the heat exchange tubes, thereby carrying away the heat on the heat exchange tubes and achieving the purpose of heat exchange and cooling. When the cooling fan suddenly malfunctions during use, the driving component drives the blocking component to switch from the retracted state to the deployed blocking state. The driving component then links with the pressing and sealing component through the pressing and sealing assembly. The pressing and sealing assembly achieves a seal between the side wall of the adjacent side support plate and the side wall of the blocking component, allowing the fixed frame to cooperate with the deployed blocking component to form a sealed cooling tank structure around the outer ring of the heat exchange tubes. Then, the water injection pipe is opened to inject cooling water into the cooling tank, which can realize emergency water cooling of the heat exchange tubes, buy time for the maintenance of the cooling fan, and ensure the uninterrupted normal operation of the system, thereby reducing potential safety hazards.

[0008] The device is further configured as follows: a synchronization control component is connected between the two sets of driving components and is used to control the synchronous operation of the two sets of driving components. The synchronization control component has a first state and a second state with the water injection pipe. When the synchronization control component is in the first state, the blocking member is in a retracted state and the synchronization control component is located directly above the cooling tank.

[0009] By adopting the above technical solution, when the synchronous control component is in the first state, the blocking component is in the retracted state. When it is necessary to switch the blocking component to the deployed blocking state, the water injection pipe is opened, and the cooling water output from the water injection pipe drives the synchronous control component to switch from the first state to the second state. This controls the two sets of driving components to achieve synchronous action, improving control accuracy and avoiding the problem that the clamping linkage component cannot effectively clamp the blocking component to form an effective seal due to asynchronous control. This improves the reliability of the implementation of this structure. After acting on the synchronous control component, the cooling water falls into the cooling tank to cool the heat exchange tubes.

[0010] The synchronization control component is further configured such that: the synchronization control component includes a counterweight control box with lifting damping sliding and an upward opening, and a synchronization control rod that moves with the counterweight control box and corresponds to the two sets of driving components respectively; the outflow path of the water injection pipe intersects with the counterweight control box.

[0011] By adopting the above technical solution, the cooling water output from the water injection pipe is injected into the counterweight control box. The weight of the counterweight control box gradually increases, driving the two synchronous control rods to move downwards simultaneously, thereby achieving synchronous control of the two sets of drive components. When the counterweight control box is full, the overflowing cooling water falls into the cooling tank under the action of gravity to cool the heat exchange tubes.

[0012] Further configured as follows: the driving component includes an unfolding and lifting component that cooperates with the synchronous control component to unfold the blocking component, an elastic tensioning component that drives the blocking component to unfold and tighten, and a connecting linkage component that connects the unfolding and lifting component and the elastic tensioning component. The unfolding and lifting component includes a lifting slider that is slidably mounted on the side support plate and located directly below the synchronous control rod, a lifting rope that connects the lifting slider and the two blocking components, and a plurality of guide rope holes through which the lifting rope passes.

[0013] By adopting the above technical solution, and by configuring the driving component into two parts—an unfolding and lifting assembly and an elastic tensioning assembly—connected by a linkage assembly, the problem of excessive additional space occupation on one side of the device caused by a single driving component driving the entire process is reduced. This structural arrangement allows for more flexible allocation of space occupied by each mechanism, making the overall structure of the device more compact and installation more flexible. It also significantly reduces the problem of excessive stroke space occupied by the original length of the tension and compression springs in the driving component, reserving more spring drive stroke while ensuring the compactness of the device.

[0014] When the synchronization control component is in the first state, the sliding resistance limits the unfilled synchronization control component to its highest position, and the gravity of the blocking component limits the lifting slider to its highest position via the lifting rope, where they rest against the bottom of the synchronization control rod. When water is added into the counterweight control box, the increased weight of the counterweight control box causes the lifting slider to move downwards via the synchronization control rod, which in turn pulls the lifting rope in conjunction with the rope guide hole to cause the blocking component to unfold upwards.

[0015] The elastic tensioning assembly is further configured to include a tensioning slider that is slidably mounted on the side support plate and located directly below the lifting slider, and a tensioning compression spring that drives the tensioning slider to move downward.

[0016] By adopting the above technical solution, the tensioning compression spring and the tensioning slider apply a large instantaneous tension force to the blocking component, thereby improving the flatness and tightness of the blocking component after it is unfolded in the blocking state. This allows the pressing and sealing assembly to better press the blocking component to achieve a seal and improve the reliability of the seal.

[0017] The connection linkage assembly is further configured as follows: the connection slot is disposed on the tensioning slider and has an opening facing the lifting slider; the connection plug is fixedly disposed on the lifting slider and used to be inserted into the connection slot; the linkage claw is rotatably disposed on the connection plug and forms a one-way engagement with the connection slot; the positioning spring is connected to the linkage claw; the connection fixing block is fixedly disposed on the side support plate; the connection positioning pin is slidably disposed on the connection fixing block and extends through the tensioning slider into the connection slot; the drive spring drives the connection positioning pin to disengage from the tensioning slider; and the positioning clip is disposed on the connection slot and engaged with the connection positioning pin. The positioning spring limits the connection plug to disengage from the connection slot. The movement paths of the positioning clip and the connection plug intersect, and the connection plug can drive the positioning clip to disengage from the connection positioning pin. When the connection positioning pin extends into the connection slot, the tensioning compression spring is in a compressed state.

[0018] By adopting the above technical solution, the connecting positioning pin extends through the tensioning slider and into the connecting slot after being stretched by the drive spring, thus engaging with the positioning clip. At this time, the tensioning compression spring is in a compressed state. The synchronous control rod abuts against the lifting slider, causing the connecting block to move downward toward the connecting slot. When the connecting block is inserted into the connecting slot, the linkage claw prevents the lifting slider and the tensioning slider from separating. The connecting block, which continues to move downward, pushes the positioning clip to release the engagement between the positioning clip and the connecting positioning pin. This allows the connecting positioning pin to disengage from the tensioning slider under the action of the drive spring. After being unlocked, the tensioning slider pulls the lifting slider downward through the tensioning compression spring, thereby realizing the linkage operation between the unfolding lifting assembly and the elastic tensioning assembly and controlling the blocking part from unfolding to tensioning.

[0019] The compression sealing assembly is further configured as follows: the compression sealing assembly includes two compression bars slidably disposed on the side support plate and located outside the two blocking members, a compression slide block slidably disposed on the side support plate, a plurality of compression connecting arms connecting each compression bar and the compression slide block, and a compression spring for driving the two compression bars to move toward each other.

[0020] By adopting the above technical solution, the pressing slide moves to drive the two pressing bars to reciprocate synchronously toward the side of the unfolded blocking member through the pressing arm. When the pressing bar moves toward the side of the blocking member, the pressing bar drives the blocking member to press and seal against the side support plate, thereby achieving a seal between the side wall of the side support plate and the side wall of the blocking member, thus forming a sealed cooling groove structure.

[0021] The clamping linkage assembly is further configured as follows: a clamping fixing block is fixedly mounted on the side support plate, a clamping insert rod moves with the clamping slide, an insertion hole is opened in the clamping fixing block for the clamping insert rod to be inserted, a limiting rod is slidably mounted on the clamping fixing block and extends into the insertion hole to restrict the clamping insert rod from passing through the insertion hole, a clamping linkage groove is opened in the limiting rod and is inclined, and a clamping linkage rod moves with the tensioning slider and slidably engages with the clamping linkage groove to drive the limiting rod away from the insertion hole. When the limiting rod is inserted into the insertion hole and the clamping insert rod abuts against the limiting rod, the clamping spring is in a compressed state and the upper opening of the clamping linkage groove intersects the movement path of the clamping linkage rod.

[0022] By adopting the above technical solution, the limiting rod is inserted into the insertion hole, and the lower end of the clamping rod abuts against the limiting rod. At this time, the clamping spring is in a compressed state. Driven by the clamping compression spring, the tensioning slider drives the clamping linkage rod downward and allows the clamping linkage rod to enter the clamping linkage groove from the upper opening. The inclined clamping linkage groove changes the force, allowing the clamping linkage rod passing through the clamping linkage groove to drive the limiting rod to move away from the insertion hole, thereby releasing the limitation on the clamping rod. This allows the clamping rod, driven by the clamping spring, to drive the two clamping bars to move towards the blocking member to press and seal the blocking member against the side support plate, thus completing the linkage operation between the driving component and the clamping and sealing assembly.

[0023] A further configuration is provided: a first positioning spring is connected to the limiting rod.

[0024] By adopting the above technical solution, the first positioning spring positioning limit rod extends into the insertion hole, thereby preventing the limit rod from being lost and improving the limiting reliability of the limit rod.

[0025] In summary, the present invention has the following beneficial effects: the present invention can achieve emergency cooling, buy time for device maintenance, thereby ensuring the normal operation of the system and reducing potential safety hazards. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 This is a partial structural diagram of an embodiment; Figure 3 This is a partial top view of an embodiment; Figure 4 This is a partial exploded view of an embodiment; Figure 5 This is a partial cross-sectional view of an embodiment; Figure 6 for Figure 5 Enlarged view of section A in the middle; Figure 7 This is another partial sectional view of the embodiment; Figure 8 This is a schematic diagram of the connecting and linkage components in the embodiment; Figure 9 This is another partial exploded view of the embodiment; Figure 10 This is a schematic diagram of the pressing linkage component in the embodiment; Figure 11 This is a schematic diagram of the structure connecting the positioning pin and the positioning clip in the embodiment.

[0027] In the diagram: 1. Bracket; 2. Cooling fan; 3. Heat exchanger tube; 4. Fixing frame; 41. Side support plate; 5. Blocking component; 6. Driving component; 61. Unfolding and lifting assembly; 611. Lifting slider; 612. Lifting rope; 613. Rope guide hole; 62. Elastic tensioning assembly; 621. Tensioning slider; 622. Tensioning compression spring; 63. Connecting linkage assembly; 631. Connecting slot; 632. Connecting insert; 633. Linkage claw; 634. Positioning spring; 635. Connecting fixing block; 636. 637. Connecting positioning pin; 638. Drive spring; 639. Positioning clip; 70. Pressing sealing assembly; 71. Pressing strip; 72. Pressing slide; 73. Pressing connecting arm; 74. Pressing spring; 80. Pressing linkage assembly; 81. Pressing fixing block; 82. Pressing insertion rod; 83. Insertion hole; 84. Limiting rod; 85. Pressing linkage groove; 86. Pressing linkage rod; 9. Water injection pipe; 10. Synchronization control assembly; 101. Counterweight control box; 102. Synchronization control rod; 11. First positioning spring; 12. Cooling tank. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] refer to Figures 1 to 11A large air-cooled device for LNG receiving station BOG compressors includes a support frame 1 and cooling fans 2 and heat exchange tubes 3 fixedly installed on the support frame 1. The cooling fans 2 are spaced apart on one side of the heat exchange tubes 3. A fixed frame 4 with an upward-facing opening and a U-shape is fixedly installed on the heat exchange tubes 3. The inlet and outlet of the heat exchange tubes 3 pass through the bottom of the fixed frame 4 and are fixedly and sealed to the fixed frame 4. The fixed frame 4 has side support plates 41 on both sides. Extendable blocking members 5 are provided on both sides of the fixed frame 4 corresponding to the air outlet direction of the cooling fans 2. The blocking members 5 can be flexible rainproof tarpaulins or rainproof rubber sheets. The heat exchange tubes 3 are fixed to the support frame 1 by the fixed frame 4.

[0030] The side support plates 41 and the blocking members 5 are arranged in a cross shape in a top view. The blocking members 5 have a blocking state when unfolded and blocking one side of the heat exchange tube 3, and a retracted state. Each of the two side support plates 41 is provided with a driving member 6 connecting the two blocking members 5. Each of the two side support plates 41 is provided with a pressing and sealing assembly 7 for sealing the side wall of the adjacent side support plate 41 and the side wall of the blocking member 5. A pressing and sealing assembly 8 is connected between the pressing and sealing assembly 7 and the driving member 6. When the blocking member 5 is in the unfolded blocking state, the pressing and sealing assembly 7 presses the side wall of the adjacent side support plate 41 and the side wall of the blocking member 5 to form a seal and form a cooling groove 12 surrounding the heat exchange tube 3. A water injection pipe 9 is located directly above the cooling groove 12. The blocking member 5 is square and its bottom edge is fixedly and sealed to the fixed frame 4.

[0031] A synchronization control component 10 is connected between the two sets of driving components 6 and is used to control the synchronous downward movement of the two sets of driving components 6. The synchronization control component 10 has a first state and a second state in conjunction with the water injection pipe 9. When the synchronization control component 10 is in the first state, the blocking member 5 is in a retracted state, and the synchronization control component 10 is located directly above the cooling tank 12. The synchronization control component 10 includes a counterweight control box 101 with upward opening, which is slidably mounted on the bracket 1 with lifting damping, and a synchronization control rod 102 fixedly mounted on the counterweight control box 101 and corresponding to the two sets of driving components 6 respectively. The outflow path of the water injection pipe 9 intersects with the counterweight control box 101. When there is no water in the counterweight control box 101, the synchronization control component 10 will not move downward due to frictional resistance, and the discharge of water can be controlled by installing a valve at the bottom of the counterweight control box 101.

[0032] The driving component 6 includes an unfolding and lifting assembly 61 that works with the synchronization control assembly 10 to unfold the blocking member 5, an elastic tensioning assembly 62 that drives the blocking member 5 to unfold and tighten, and a connecting linkage assembly 63 that connects the unfolding and lifting assembly 61 and the elastic tensioning assembly 62. The unfolding and lifting assembly 61 includes a lifting slider 611 that is slidably mounted on the side support plate 41 and located directly below the synchronization control rod 102, two lifting ropes 612 that are fixedly connected to the top of the lifting slider 611 and the two blocking members 5, and multiple rope guide holes 613 that are opened in the side support plate 41 for the lifting ropes 612 to pass through. When the blocking member 5 is in a folded and stored state, the lifting slider 611 is in a high position due to the gravity of the blocking member 5.

[0033] The elastic tensioning assembly 62 includes a tensioning slider 621 that is slidably mounted on the side support plate 41 and located directly below the lifting slider 611, and a tensioning compression spring 622 that drives the tensioning slider 621 to move downward. The two ends of the tensioning compression spring 622 abut against the side support plate 41 and the tensioning slider 621, respectively.

[0034] The linkage assembly 63 includes a linkage slot 631 formed in the tension slider 621 and having an opening facing the lifting slider 611; a linkage insert 632 integrally formed in the lifting slider 611 and for insertion into the linkage slot 631; a linkage claw 633 rotatably formed in the linkage insert 632 and forming a one-way engagement with the linkage slot 631; a positioning spring 634 connecting the linkage claw 633; ​​a linkage fixing block 635 fixedly formed in the side support plate 41; a linkage positioning pin 636 horizontally slidably formed in the linkage fixing block 635 and extending through the tension slider 621 into the linkage slot 631; a drive spring 637 for driving the linkage positioning pin 636 to disengage from the tension slider 621; and a positioning clip 638 formed in the linkage slot 631 and engaging with the linkage positioning pin 636. The linkage claws 633 are symmetrically arranged along the movement direction of the linkage insert 632, and the positioning spring 634 is formed between the two linkage claws 633 and fixedly connected to the two linkage claws 633. The connecting positioning pin 636 and the drive spring 637 are symmetrically arranged along the movement direction of the connecting insert 632. The two ends of the drive spring 637 abut against the connecting positioning pin 636 and the connecting fixing block 635 respectively. The two ends of the positioning clip 638 are respectively engaged with the two connecting positioning pins 636.

[0035] The positioning spring 634 restricts the connecting plug 632 from disengaging from the connecting slot 631. The movement paths of the positioning clip 638 and the connecting plug 632 intersect, and the connecting plug 632 can drive the positioning clip 638 to disengage from the connecting positioning pin 636. When the connecting positioning pin 636 passes through the tension slider 621 and extends into the connecting slot 631, the tension compression spring 622 is in a compressed state.

[0036] The compression sealing assembly 7 includes two compression bars 71 horizontally slidably disposed on the side support plate 41 and located outside the two blocking members 5, a compression slide 72 vertically slidably disposed on the side support plate 41, a plurality of compression connecting arms 73 connecting each compression bar 71 and the compression slide 72, and a compression spring 74 driving the two compression bars 71 to move towards each other. Preferably, two compression connecting arms 73 are connected to each compression bar 71. One end of the compression connecting arm 73 is rotatably connected to the compression bar 71, and the other end is rotatably connected to the compression slide 72. The two ends of the compression spring 74 are respectively fixedly connected to the side support plate 41 and the compression slide 72. When the compression bar 71 drives the blocking member 5 to compress and seal against the side wall of the side support plate 41, sealing gaskets are provided between the blocking member 5 and the side wall of the side support plate 41, and between the compression bar 71 and the blocking member 5. The two sealing gaskets are respectively fixedly disposed on the side wall of the side support plate 41 and the compression bar 71.

[0037] The clamping linkage assembly 8 includes a clamping fixing block 81 fixedly mounted on the side support plate 41, a clamping insertion rod 82 fixedly mounted on the clamping slide block 72, an insertion hole 83 opened in the clamping fixing block 81 for the insertion of the clamping insertion rod 82, a limiting rod 84 slidably mounted on the clamping fixing block 81 and extending into the insertion hole 83 to restrict the clamping insertion rod 82 from passing through the insertion hole 83, a clamping linkage groove 85 opened in the limiting rod 84 and inclined, and a clamping linkage rod 86 fixedly mounted on the tensioning slider 621 and sliding through the clamping linkage groove 85 to drive the limiting rod 84 away from the insertion hole 83.

[0038] The movement path of the clamping rod 82 passes through the insertion hole 83. When the limiting rod 84 is inserted into the insertion hole 83 and the clamping rod 82 abuts against the limiting rod 84, the clamping spring 74 is in a compressed state, and the upper opening of the clamping linkage groove 85 intersects with the movement path of the clamping linkage rod 86. A first positioning spring 11 is connected to the limiting rod 84, and the two ends of the first positioning spring 11 are respectively fixedly connected to the limiting rod 84 and the clamping fixing block 81.

[0039] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A large air cooling device for a BOG compressor of an LNG receiving station, comprising a support (1) and a cooling fan (2) and a heat exchange pipe (3) mounted on the support (1), the cooling fan (2) being arranged on one side of the heat exchange pipe (3), characterized in that: The heat exchange pipe (3) is provided with a fixed frame (4) which is open upward and shaped as a Chinese character "fang". The two sides of the fixed frame (4) are side support plates (41), and the two sides of the fixed frame (4) which correspond to the direction of the cooling fan (2) are provided with extendable blocking pieces (5). The side support plates (41) and the blocking pieces (5) are cross-distributed. The blocking pieces (5) have a blocking state of blocking one side of the heat exchange pipe (3) after being extended and a storage state. The two side support plates (41) are provided with driving members (6) which connect the two blocking pieces (5). The two side support plates (41) are provided with compression sealing assemblies (7) for sealing the side walls of the adjacent side support plates (41) and the side walls of the blocking pieces (5). The compression sealing assemblies (7) and the driving members (6) are connected with compression linkage assemblies (8). When the blocking pieces (5) are in the blocking state, the compression sealing assemblies (7) compress the side walls of the adjacent side support plates (41) and the side walls of the blocking pieces (5) to form a sealing and a cooling groove (12) around the heat exchange pipe (3). A water injection pipe (9) is arranged above the cooling groove (12).

2. The large air cooling device for BOG compressor of LNG receiving station according to claim 1, characterized in that: The two groups of driving members (6) are connected with a synchronous control assembly (10) which cooperates with the water injection pipe (9) and is used for controlling the synchronous action of the two groups of driving members (6). The synchronous control assembly (10) has a first state and a second state which cooperates with the water injection pipe (9). When the synchronous control assembly (10) is in the first state, the blocking pieces (5) are in the storage state, and the synchronous control assembly (10) is located above the cooling groove (12).

3. The large air cooling device for BOG compressor of LNG receiving station according to claim 2, characterized in that: The synchronous control assembly (10) comprises a counterweight control box (101) which is lifted and damped and has an upward opening, and synchronous control rods (102) which move with the counterweight control box (101) and correspond to the two groups of driving members (6) respectively. The outlet path of the water injection pipe (9) intersects with the counterweight control box (101).

4. The large air cooling device for BOG compressor of LNG receiving station according to claim 3, characterized in that: The driving member (6) comprises an expansion pull assembly (61) which cooperates with the synchronous control assembly (10) and is used for expanding the blocking piece (5), an elastic tensioning assembly (62) which drives the blocking piece (5) to expand and be tensioned, and a linkage assembly (63) which connects the expansion pull assembly (61) and the elastic tensioning assembly (62). The expansion pull assembly (61) comprises a lifting slider (611) which is arranged on the side support plate (41) and located below the synchronous control rod (102), a lifting rope (612) which connects the lifting slider (611) and the two blocking pieces (5), and a plurality of guide rope holes (613) through which the lifting rope (612) passes.

5. The large air cooling device for BOG compressor of LNG receiving station according to claim 4, characterized in that: The elastic tensioning assembly (62) comprises a tensioning slider (621) which is arranged on the side support plate (41) and located below the lifting slider (611), and a tensioning compression spring (622) which drives the tensioning slider (621) to move downward.

6. The large air cooling device for BOG compressor of LNG receiving station according to claim 5, characterized in that: The connection linkage assembly (63) comprises a connection slot (631) provided on the tensioning slider (621) and having an opening towards the lifting slider (611), a connection plug (632) fixedly provided on the lifting slider (611) and inserted into the connection slot (631), a linkage claw (633) rotatably provided on the connection plug (632) and unidirectionally clamped with the connection slot (631), a positioning spring (634) connected with the linkage claw (633), a connection fixed block (635) fixedly provided on the side support plate (41), a connection positioning pin (636) slidingly provided on the connection fixed block (635) and extending into the connection slot (631) through the tensioning slider (621), a driving spring (637) driving the connection positioning pin (636) to be separated from the tensioning slider (621), and a positioning clamp (638) provided on the connection slot (631) and clamped with the connection positioning pin (636). The positioning spring (634) limits the connection plug (632) to be separated from the connection slot (631), the positioning clamp (638) intersects with the movement path of the connection plug (632), and the connection plug (632) can drive the positioning clamp (638) to be separated from the connection positioning pin (636). When the connection positioning pin (636) extends into the connection slot (631), the tensioning compression spring (622) is in a compressed state.

7. The large air cooling device for BOG compressor of LNG receiving station according to claim 5, characterized in that: The compression sealing assembly (7) comprises two compression strips (71) slidingly provided on the side support plate (41) and located outside the two blocking pieces (5), a compression sliding seat (72) slidingly provided on the side support plate (41), a plurality of compression connecting arms (73) connecting each compression strip (71) with the compression sliding seat (72), and a compression spring (74) driving the two compression strips (71) to move towards each other.

8. The large air cooling device for BOG compressor of LNG receiving station according to claim 7, characterized in that: The compression linkage assembly (8) comprises a compression fixed block (81) fixedly provided on the side support plate (41), a compression insertion rod (82) moving with the compression sliding seat (72), an insertion hole (83) provided on the compression fixed block (81) and into which the compression insertion rod (82) is inserted, a limiting rod (84) slidingly provided on the compression fixed block (81) and extending into the insertion hole (83) for limiting the compression insertion rod (82) from passing through the insertion hole (83), a compression linkage groove (85) provided on the limiting rod (84) and obliquely arranged, and a compression linkage rod (86) moving with the tensioning slider (621) and slidingly fitted with the compression linkage groove (85) for driving the limiting rod (84) to move away from the insertion hole (83). When the limiting rod (84) is inserted into the insertion hole (83) and the compression insertion rod (82) abuts against the limiting rod (84), the compression spring (74) is in a compressed state, and the upper end opening of the compression linkage groove (85) intersects with the movement path of the compression linkage rod (86).

9. The large air cooling device for BOG compressor of an LNG receiving station according to claim 8, characterized in that: The limiting rod (84) is connected with the first positioning spring (11).

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