Efficient pressure reducing device for LNG storage tank

Abstract

The utility model provides an efficient depressurization device for an LNG storage tank, and relates to the technical field of LNG storage tanks, the efficient depressurization device for the LNG storage tank comprises a tank body, a supporting structure is arranged below the tank body, the tank body extends in the horizontal direction, pressure gauges are arranged at the two ends of the tank body respectively, a connecting pipe is fixedly arranged above the tank body, and the upper end of the connecting pipe is connected with a depressurization pipe; the upper end of the condensation pipe is connected with an input pipe, and the lower end of the condensation pipe is connected with an output pipe; a connecting pipe is arranged in the connecting pipe, a pressure reducing pipe is arranged in the connecting pipe, a through pipe is arranged below the pressure reducing pipe, the through pipe is inserted into the connecting pipe to connect the pressure reducing pipe and the connecting pipe, a control valve is arranged in the connecting pipe, and a sealing ring is arranged between the control valve and the through pipe. Pollution caused by interaction of gas and air in the storage tank is avoided, and by arranging a positioning column and a dismounting assembly, the depressurization pipe is convenient to dismount.

Description

Technical Field

[0001] The utility model relates to the technical field of LNG storage tanks, and in particular to a high-efficiency pressure reducing device for LNG storage tanks. Background Art

[0002] Conventional LNG gas tanks are exposed outdoors. When exposed to direct sunlight, the external temperature rises, and the internal low temperature of the LNG gas tank is lost relatively quickly, causing the internal pressure to rise relatively quickly. The LNG tank pressure reducing device is a device specifically used to reduce the internal pressure of the LNG tank.

[0003] Traditional LNG tank depressurization devices, such as the existing Chinese utility model patent with announcement number CN214421358U, discloses a depressurization device for oil tanks, which, through the arrangement of a floating device and a depressurization module, allows the pressure to push the airflow to lift the floating block upwards, and the bar groove on the fixed block limits the floating block at this time, so that the floating block can only move upwards, and the floating block lifts the depressurization block, and since a ventilation hole is provided on the top of the limiting recessed block, the inside of the limiting recessed block can be ventilated with the outside. Although the above technology can reduce the pressure, direct ventilation during the depressurization process will cause the inside of the storage tank to interact with the air and cause contamination, and the depressurization device is not convenient to disassemble for cleaning. Utility Model Content

[0004] The purpose of the utility model is to provide a high-efficiency pressure reducing device for LNG storage tanks in view of the above-mentioned problems in the prior art, so as to solve the current problems of pollution caused by interaction with air during the pressure reducing process and the inconvenient disassembly of the pressure reducing device.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] The utility model provides a high-efficiency pressure reduction device for an LNG storage tank, comprising a tank body, a supporting structure is arranged below the tank body, the tank body extends in a horizontal direction, pressure gauges are arranged at both ends of the tank body, a connecting pipe is fixedly arranged above the tank body, and a pressure reducing pipe is connected to the upper end of the connecting pipe; a condenser is arranged inside the pressure reducing pipe, and the liquid inlet and liquid outlet ends of the condenser are respectively connected to a cooling component, and the cooling component is used for conveying cooling liquid into the condenser to perform heat exchange and cooling on the temperature inside the pressure reducing pipe to achieve the purpose of pressure reduction; a through pipe is arranged below the pressure reducing pipe, and the through pipe is inserted into the connecting pipe to connect the pressure reducing pipe and the connecting pipe, a control valve is arranged in the connecting pipe, and a sealing ring is arranged between the control valve and the through pipe.

[0007] Optionally, the temperature reduction component is arranged on the outer periphery of the pressure reduction pipe. The temperature reduction component includes: a water storage tank installed on the upper part of the pressure reduction pipe, with a plurality of heat dissipation fins fixedly connected to the outer periphery of the water storage tank; a water pump installed on the upper part of the water storage tank, and the liquid inlet end of the water pump is connected to the liquid outlet of the water storage tank through a pipeline; an input pipe, the liquid inlet end of the input pipe is connected to the liquid outlet end of the water pump, and the liquid outlet end of the input pipe is connected to the liquid inlet end of the condensation pipe; an output pipe, the liquid inlet end of the output pipe is connected to the liquid outlet end of the condensation pipe, and the liquid outlet end of the output pipe is connected to the liquid return port of the water storage tank.

[0008] Optionally, the diameter of the through pipe is smaller than that of the pressure reduction pipe. A positioning column is further arranged at the bottom of the pressure reduction pipe, and the positioning column is arranged outside the through pipe. A positioning groove is formed at the upper end of the connecting pipe, and the positioning column is inserted into the positioning groove to position the through pipe and the connecting pipe.

[0009] Optionally, a disassembly component is arranged on the side wall of the connecting pipe. The disassembly component includes a connecting rod passing through the side wall of the connecting pipe. The connecting rod is horizontally arranged and slides along its axis. A clamping block is arranged at one end of the connecting rod facing the inner side of the connecting pipe. A clamping groove is arranged at a position on the outer periphery of the through pipe corresponding to the clamping block, and the shapes of the clamping groove and the clamping block match.

[0010] Optionally, the cross-section of the clamping block is larger than that of the connecting rod. The side wall of the connecting pipe is sequentially provided with a first sliding hole and a second sliding hole communicating from inside to outside for the connecting rod to pass through. The first sliding hole matches the cross-section of the clamping block, the second sliding hole matches the cross-section of the connecting rod, and one end of the connecting rod extends to the outside of the connecting pipe to be provided with a sliding block, and the cross-section of the sliding block is larger than that of the second sliding hole.

[0011] Optionally, the end face of the clamping block is inclined downward. A compression spring is sleeved on the connecting rod, and the compression spring is arranged in the first sliding hole and abuts between the opposite faces of the first sliding hole and the clamping block at both ends respectively.

[0012] Optionally, a water inlet is arranged at the top of the water storage tank, and a water outlet is arranged below the side wall of the water storage tank.

[0013] The beneficial effects of the present utility model include:

[0014] 1. By arranging a pressure reduction pipe, a condensation pipe, a through pipe, a control valve, a sealing ring and a temperature reduction component, opening the control valve allows the gas in the LNG storage tank to enter the pressure reduction pipe. The condensation pipe makes it easier to liquefy, reducing the internal pressure of the LNG storage tank. The coolant in the condensation pipe circulates into the water storage tank and is cooled by the heat dissipation fins, achieving efficient pressure reduction of the LNG storage tank and avoiding pollution caused by the interaction between the internal gas of the storage tank and air.

[0015] 2. During installation, by setting the positioning posts and the disassembly components, the positioning posts are inserted into the positioning grooves, facilitating the installation of the pressure-reducing pipe. During disassembly, the slider is pulled to make the clamping block disengage from the through pipe, and then the pressure-reducing pipe is removed to clean and maintain the interior, achieving convenient disassembly of the pressure-reducing pipe and facilitating the cleaning and repair of the pressure-reducing pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can also be obtained based on these drawings without creative efforts.

[0017] Figure 1 Schematic diagram of the installation structure of an efficient pressure-reducing device for an LNG storage tank provided by an embodiment of the present application;

[0018] Figure 2 One of the schematic diagrams of the structure of the pressure-reducing pipe of an efficient pressure-reducing device for an LNG storage tank provided by an embodiment of the present application;

[0019] Figure 3 Another schematic diagram of the structure of the pressure-reducing pipe of an efficient pressure-reducing device for an LNG storage tank provided by an embodiment of the present application;

[0020] Figure 4 Another schematic diagram of the structure of the pressure-reducing pipe of an efficient pressure-reducing device for an LNG storage tank provided by an embodiment of the present application.

[0021] Reference numerals: 1, tank body; 2, pressure gauge; 3, support seat; 4, connecting pipe; 5, pressure-reducing pipe; 6, water storage tank; 7, through pipe; 8, heat dissipation fins; 9, water pump; 10, water inlet; 11, water outlet; 12, input pipe; 13, positioning post; 14, output pipe; 15, condensation pipe; 16, sealing ring; 17, slider; 18, connecting rod; 19, clamping block; 20, compression spring; 21, control valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. The components of the embodiment of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiment of the present application. It should be noted that, in the absence of conflict, the various features in the embodiment of the present application can be combined with each other, and the combined embodiment is still within the protection scope of the present application.

[0023] Although the traditional LNG storage tank depressurization device can reduce the pressure, direct ventilation during the depressurization process will cause contamination due to interaction between the inside of the tank and the air, and the depressurization device is not convenient to disassemble for cleaning. To solve the above problems, the embodiment of the present application proposes a high-efficiency depressurization device for LNG storage tanks. By providing a depressurization pipe, a condenser, a control valve and a cooling component, the LNG storage tank is depressurized and contamination caused by interaction between the gas and air inside the tank is avoided. By providing a positioning column and a disassembly component, the depressurization pipe is conveniently disassembled.

[0024] See also Figures 1-4 Embodiment 1 of the present application provides a high-efficiency pressure reduction device for an LNG storage tank, comprising a tank body 1, a support structure is arranged below the tank body 1, the support structure is two support seats 3, the tank body extends in the horizontal direction, pressure gauges 2 are arranged at both ends of the tank body, a connecting pipe 4 is fixedly arranged above the tank body 1, and a pressure reduction pipe 5 is connected to the upper end of the connecting pipe 4; a condenser 15 is arranged inside the pressure reduction pipe 5, and the liquid inlet and liquid outlet ends of the condenser 15 are respectively connected to a cooling component, and the cooling component is used to transport the coolant to the condenser 15 to perform heat exchange and cooling on the temperature inside the pressure reduction pipe 5 to achieve the purpose of pressure reduction; a through pipe 7 is arranged below the pressure reduction pipe 5, and the through pipe 7 is inserted into the connecting pipe 4 to connect the pressure reduction pipe 5 and the connecting pipe 4, a control valve 21 is arranged in the connecting pipe 4, and a sealing ring 16 is arranged between the control valve 21 and the through pipe 7.

[0025] Furthermore, a cooling component is arranged on the periphery of the pressure-reducing pipe 5, and the cooling component includes: a water tank 6, which is installed on the upper part of the pressure-reducing pipe 5, and a plurality of cooling fins 8 are fixedly connected to the periphery of the water tank 6; a water pump 9, which is installed on the upper part of the water tank 6, and the liquid inlet end of the water pump 9 is connected to the liquid outlet of the water tank 6 through a pipeline; an input pipe 12, the liquid inlet end of the input pipe 12 is connected to the liquid outlet end of the water pump 9, and the liquid outlet end of the input pipe 12 is connected to the liquid inlet end of the condenser 15; an output pipe 14, the liquid inlet end of the output pipe 14 is connected to the liquid outlet end of the condenser 15, and the liquid outlet end of the output pipe 14 is connected to the liquid return port of the water tank 6.

[0026] Specifically, the tank body 1 serves as the main container for storing LNG. The tank body 1 needs to have good heat insulation performance and pressure resistance to maintain the liquid state of LNG and prevent the influence of the external environment on the internal liquid; the pressure gauge 2 is used to measure and display the pressure inside the tank body 1, monitor the pressure change in real time, and ensure that the storage tank operates within a safe working pressure range; the support base 3 is used to provide stable support for the tank body 1 to ensure the structural stability and safety of the tank body 1 when it is filled with LNG; the connecting pipe 4 is used to connect the tank body 1 with other pressure-reducing components to provide a channel for gas flow; the control valve 21 is used to control the opening and closing of gas flow and control the pressure-reducing rate by adjusting the opening of the valve; the through pipe 7 is used as a channel for gas flow, connecting the pressure-reducing pipe 5 and other components. The through pipe 7 is inserted and connected inside the connecting pipe 4 for easy maintenance and replacement; the pressure-reducing pipe 5 is the main part for realizing the pressure-reducing function. The condensate pipe 15 fixedly connected inside is used to cool the gas and reduce the pressure; the condensate pipe 15 is used to reduce the gas temperature and condense it by conducting the heat of the cooling medium, thereby reducing the pressure; the input pipe 12 is used to transport the cooling medium to the condensate pipe 15 to realize the cooling cycle; the output pipe 14 is used to discharge the pressure-reduced gas or cooling medium to maintain the continuous operation of the system; the sealing ring 16 is used to ensure the seal between the through pipe 7 and the control valve 21 to prevent gas leakage; the water storage tank 6 is used to store the cooling medium to provide the necessary coolant for the cooling process; the heat dissipation fins 8 are used to increase the heat dissipation area of the water storage tank 6 to improve the cooling efficiency; the water pump 9 is used to drive the circulation of the cooling medium, transport the coolant from the water storage tank 6 to the condensate pipe 15, and return it from the condensate pipe 15 to the water storage tank 6.

[0027] In this embodiment, the diameter of the through pipe 7 is smaller than that of the pressure-reducing pipe 5. A positioning post 13 is further provided at the bottom of the pressure-reducing pipe 5. The positioning post 13 is arranged outside the through pipe 7. A positioning groove is opened at the upper end of the connecting pipe 4, and the positioning post 13 is inserted into the positioning groove to position the through pipe 7 and the connecting pipe 4.

[0028] Furthermore, a disassembly component is provided on the side wall of the connecting pipe 4. The disassembly component includes a connecting rod 18 passing through the side wall of the connecting pipe 4. The connecting rod 18 is horizontally arranged and slides along its axis. A clamping block 19 is arranged at one end of the connecting rod 18 facing the inside of the connecting pipe 4. A clamping groove is arranged at a position on the outer circumference of the through pipe 7 opposite to the clamping block 19, and the shapes of the clamping groove and the clamping block 19 match.

[0029] Specifically, the cross-section of the clamping block 19 is larger than that of the connecting rod 18. The side wall of the connecting pipe 4 is sequentially provided with a first sliding hole and a second sliding hole communicating from the inside to the outside for the connecting rod 18 to pass through. The cross-section of the first sliding hole matches that of the clamping block 19, and the cross-section of the second sliding hole matches that of the connecting rod 18. One end of the connecting rod 18 extends to the outside of the connecting pipe 4 and is provided with a sliding block 17, and the cross-section of the sliding block 17 is larger than that of the second sliding hole.

[0030] Furthermore, the end surface of the block 19 is tilted downward, and the connecting rod 18 is sleeved with a compression spring 20 . The compression spring 20 is arranged in the first sliding hole, and two ends of the compression spring 20 are respectively pressed between the first sliding hole and the opposite surface of the block 19 .

[0031] Furthermore, a water inlet 10 is provided at the top of the water storage tank 6 , and a water outlet 11 is provided below the side wall of the water storage tank 6 .

[0032] Specifically, the positioning column 13 is used to ensure that the through pipe 7 is in the correct position in the connecting pipe 4, which is convenient for disassembly and maintenance. The block 19 is used to cooperate with the slot to achieve the fixation and disassembly of the through pipe 7: during installation, by setting the positioning column and the disassembly component, the positioning column is inserted into the positioning slot, which is convenient for installing the step-down pipe; during disassembly, the slider is pulled to make the block detach from the through pipe, and then the step-down pipe is taken out to clean and maintain the inside, which makes it convenient to disassemble the step-down pipe and clean and repair the step-down pipe. The compression spring 20 is used to provide elastic force to ensure that the block 19 is stably stuck in the slot. The water inlet 10 is used to add cooling medium to the water storage tank 6. The water outlet 11 is used for the cooling medium to flow out of the water storage tank 6 and enter the step-down system circulation.

[0033] The working principle and use process of the utility model are as follows: when the pressure in the LNG storage tank reaches the set value, the control valve 21 automatically opens, and the high-pressure gas enters the through pipe 7 through the connecting pipe 4, and then flows into the pressure-reducing pipe 5; inside the pressure-reducing pipe 5, the gas passes through the condenser 15 for cooling, the gas temperature decreases, and the pressure decreases accordingly; the cooling medium flows from the water storage tank 6 into the condenser 15 through the input pipe 12, and after absorbing the heat of the gas, it returns to the water storage tank 6 through the output pipe 14, forming a cooling cycle. When it is necessary to clean or repair the pressure-reducing pipe 5, first close the control valve 21 to stop the gas flow, then operate the slider 17, and disengage the block 19 from the card slot through the connecting rod 18, so that the through pipe 7 is separated from the connecting pipe 4, and the pressure-reducing pipe 5 can be easily removed for internal cleaning or replacement of damaged parts. After the pressure-reducing pipe 5 is disassembled, the interior can be thoroughly cleaned to remove accumulated dirt and ice blockages to ensure the efficient operation of the pressure-reducing pipe 5. After cleaning, the pressure-reducing pipe 5 is reinstalled, the positioning column 13 slides into the positioning groove to ensure that the position of the through pipe 7 is correct, and the block 19 is operated by the slider 17 to re-engage the block 19 in the groove to lock the connection between the through pipe 7 and the pressure-reducing pipe 5. After the pressure-reducing pipe 5 is installed, the control valve 21 is opened to restore the normal operation of the system.

[0034] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An efficient pressure reduction device for an LNG storage tank, characterized in that It includes a tank body (1), a support structure is arranged below the tank body (1), the tank body extends in the horizontal direction, pressure gauges (2) are respectively arranged at both ends of the tank body, a connecting pipe (4) is fixedly arranged above the tank body (1), and an air pressure reducing pipe (5) is connected to the upper end of the connecting pipe (4); A condensing pipe (15) is arranged inside the air pressure reducing pipe (5), the liquid inlet end and the liquid outlet end of the condensing pipe (15) are respectively connected to a cooling component, and the cooling component is used to convey a coolant into the condensing pipe (15) to exchange heat and cool the temperature inside the air pressure reducing pipe (5) so as to achieve the purpose of reducing pressure; A through pipe (7) is arranged below the air pressure reducing pipe (5), the through pipe (7) is inserted into the connecting pipe (4) to connect the air pressure reducing pipe (5) and the connecting pipe (4), a control valve (21) is arranged inside the connecting pipe (4), and a sealing ring (16) is arranged between the control valve (21) and the through pipe (7).

2. The high-efficiency pressure-reducing device for LNG storage tanks according to claim 1, wherein The cooling component is arranged on the outer periphery of the air pressure reducing pipe (5), and the cooling component includes: A water storage tank (6), the water storage tank (6) is installed on the upper part of the air pressure reducing pipe (5), and a plurality of heat dissipation fins (8) are fixedly connected to the outer periphery of the water storage tank (6); A water pump (9), the water pump (9) is installed on the upper part of the water storage tank (6), and the liquid inlet end of the water pump (9) is connected to the liquid outlet of the water storage tank (6) through a pipeline; An input pipe (12), the liquid inlet end of the input pipe (12) is connected to the liquid outlet end of the water pump (9), and the liquid outlet end of the input pipe (12) is connected to the liquid inlet end of the condensing pipe (15); An output pipe (14), the liquid inlet end of the output pipe (14) is connected to the liquid outlet end of the condensing pipe (15), and the liquid outlet end of the output pipe (14) is connected to the liquid return port of the water storage tank (6).

3. The high-efficiency pressure-reducing device for LNG storage tanks according to claim 1, wherein The diameter of the through pipe (7) is smaller than the diameter of the air pressure reducing pipe (5), a positioning column (13) is further arranged at the bottom of the air pressure reducing pipe (5), the positioning column (13) is arranged outside the through pipe (7), and a positioning groove is opened at the upper end of the connecting pipe (4), and the positioning column (13) is inserted into the positioning groove to position the through pipe (7) and the connecting pipe (4).

4. The high-efficiency pressure-reducing device for LNG storage tanks according to claim 1, characterized in that, A disassembly component is arranged on the side wall of the connecting pipe (4), the disassembly component includes a connecting rod (18) passing through the side wall of the connecting pipe (4), the connecting rod (18) is horizontally arranged and slides along its axis, a clamping block (19) is arranged at one end of the connecting rod (18) facing the inner side of the connecting pipe (4), and a clamping groove is arranged at the position of the outer periphery of the through pipe (7) opposite to the clamping block (19), and the shapes of the clamping groove and the clamping block (19) match.

5. The high-efficiency pressure-reducing device for LNG storage tanks according to claim 4, wherein The cross-section of the clamping block (19) is larger than that of the connecting rod (18). The side wall of the connecting pipe (4) is successively provided with a first sliding hole and a second sliding hole communicating with each other from inside to outside for the connecting rod (18) to pass through. The cross-section of the first sliding hole matches that of the clamping block (19), and the cross-section of the second sliding hole matches that of the connecting rod (18). One end of the connecting rod (18) extends to the outside of the connecting pipe (4) and is provided with a sliding block (17), and the cross-section of the sliding block (17) is larger than that of the second sliding hole.

6. The high-efficiency pressure-reducing device for LNG storage tanks according to claim 5, wherein, The end face of the clamping block (19) is inclined downward. A compression spring (20) is sleeved on the connecting rod (18). The compression spring (20) is arranged in the first sliding hole and its two ends respectively abut between the opposite faces of the first sliding hole and the clamping block (19).

7. The high-efficiency pressure-reducing device for LNG storage tanks according to claim 2, characterized in that, The top of the water storage tank (6) is provided with a water inlet (10), and the lower part of the side wall of the water storage tank (6) is provided with a water outlet (11).

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