A LNG storage tank sealing monitoring and early warning device

Abstract

The utility model discloses an LNG storage tank sealing monitoring and early warning device, comprising a storage tank body, an alarm light is fixedly installed on the upper surface of the storage tank body, a connecting pipe is fixedly connected to the upper surface of the storage tank body, a first solenoid valve is fixedly installed on the outer surface of the connecting pipe, one end of the connecting pipe is fixedly connected to a sealing monitoring tube, a pressure relief pipe is fixedly connected to the outer surface of the sealing monitoring tube, and a second solenoid valve is fixedly installed on the outer surface of the pressure relief pipe. In the utility model, through the pressure monitoring device, automatic monitoring of the air pressure inside the storage tank body is achieved, so as to monitor the sealing of the storage tank body in real time, and the device has the effect of automatic pressure relief and exhaust when the air pressure in the storage tank body exceeds the standard, so as to solve the problem that the gas sensor cannot detect and alarm the leaked gas in time, which may cause safety hazards.

Description

Technical Field

[0001] The utility model relates to the technical field of liquefied natural gas storage tanks, in particular to a sealing monitoring and early warning device for an LNG storage tank. Background Art

[0002] LNG, which is the abbreviation of liquefied natural gas, is a combustible gas naturally extracted from gas fields, mainly composed of methane. LNG is made by cooling gaseous natural gas to -162℃ under normal pressure to condense it into liquid. After liquefaction, natural gas can greatly save storage and transportation space, and has the characteristics of high calorific value and high performance. LNG is a clean and efficient energy source. Since imported LNG helps energy-consuming countries to achieve energy supply diversification and ensure energy security, and exported LNG helps natural gas producing countries to effectively develop natural gas resources, increase foreign exchange earnings, and promote national economic development, LNG trade is becoming a new hot spot in the global energy market. As a combustible liquefied natural gas, the sealing performance of the storage tank needs to be monitored in real time during its storage to avoid accidents.

[0003] Existing storage equipment usually uses gas sensors to monitor the entire area of ​​the tank to monitor the sealing performance of the storage tank to avoid tank leakage. However, when the gas leaks, it moves from the bottom to the top, and the gas sensor is usually installed at a high place, so that the entire height of the tank can be monitored. This makes it impossible to issue a timely warning for gas leakage at the bottom, which can easily cause safety hazards. Utility Model Content

[0004] The purpose of the utility model is to provide a LNG storage tank sealing monitoring and early warning device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an LNG storage tank sealing monitoring and early warning device, comprising a storage tank body, an alarm light is fixedly installed on the upper surface of the storage tank body, a connecting pipe is fixedly connected to the upper surface of the storage tank body, a first solenoid valve is fixedly installed on the outer surface of the connecting pipe, one end of the connecting pipe is fixedly connected to a sealing monitoring cylinder, the outer surface of the sealing monitoring cylinder is fixedly connected to a pressure relief pipe, and a second solenoid valve is fixedly installed on the outer surface of the pressure relief pipe;

[0006] The inner wall of the sealing monitoring tube is provided with a pressure monitoring device, and the pressure monitoring device comprises an annular movable block, and the outer surface of the annular movable block is movably sleeved with the inner wall of the sealing monitoring tube.

[0007] Preferably, an annular pressure sensor is fixedly mounted on the lower surface of the annular movable block, an annular piston block is fixedly mounted on the lower surface of the annular pressure sensor, and an air guide tube is fixedly sleeved on the inner wall of the annular piston block.

[0008] Preferably, one end of the air duct passes through and extends to the upper surface of the annular movable block, the upper surface of the annular movable block is fixedly connected with a support spring, one end of the support spring is fixedly connected to the inner top wall of the sealing monitoring cylinder, and the inner wall of the air duct is fixedly sleeved with an annular support block.

[0009] Preferably, the upper surface of the annular support block is provided with through holes distributed in an annular array, the inner wall of the annular support block is movably sleeved with a driving rod, and one end of the driving rod is fixedly connected to a movable piston block.

[0010] Preferably, the outer surface of the movable piston block is movably connected to the inner wall of the air guide tube, and the outer surface of the driving rod is movably connected to a contraction spring, and one end of the contraction spring is fixedly connected to the upper surface of the movable piston block.

[0011] Preferably, the other end of the contraction spring is fixedly connected to the lower surface of the annular support block, a limiting sleeve is fixedly installed on the inner top wall of the sealing monitoring cylinder, and a guide column is movably sleeved on the inner wall of the limiting sleeve.

[0012] Preferably, the lower surface of the guide column is fixedly connected to the other end of the driving rod, a small servo electric cylinder is fixedly installed on the inner top wall of the sealing monitoring cylinder, one end of the piston rod of the small servo electric cylinder is fixedly connected to an adjusting block, and the outer surface of the adjusting block is movably connected to the inner wall of the limiting sleeve.

[0013] Compared with the prior art, the beneficial effect of the utility model is that the pressure monitoring device realizes automatic monitoring of the air pressure inside the storage tank body, thereby monitoring the sealing of the storage tank body in real time, and has the effect of automatically relieving pressure and exhausting when the air pressure in the storage tank body exceeds the standard, thereby solving the problem that the gas sensor cannot detect and alarm the leaked gas in time, which may easily cause safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 A three-dimensional diagram of the sealing monitoring tube structure of a sealing monitoring and early warning device for an LNG storage tank proposed in the utility model;

[0016] Figure 3 This is an exploded diagram of the annular piston block structure of an LNG storage tank sealing monitoring and early warning device proposed by the utility model;

[0017] Figure 4 A three-dimensional diagram of the air guide pipe structure of an LNG storage tank sealing monitoring and early warning device proposed by the utility model;

[0018] Figure 5 This is a three-dimensional diagram of the limiting sleeve structure of the LNG storage tank sealing monitoring and early warning device proposed by the utility model.

[0019] In the figure: 1. Storage tank body; 2. Warning light; 3. Connecting pipe; 4. First solenoid valve; 5. Sealing monitoring tube; 6. Pressure relief pipe; 7. Second solenoid valve; 8. Annular movable block; 81. Annular pressure sensor; 82. Annular piston block; 83. Air guide tube; 84. Support spring; 85. Annular support block; 86. Through hole; 87. Drive rod; 88. Moving piston block; 89. Contraction spring; 810. Limit sleeve; 811. Guide column; 812. Small servo electric cylinder; 813. Adjustment block. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-Figure 5 The utility model provides a technical solution: an LNG storage tank sealing monitoring and early warning device, comprising a storage tank body 1, an alarm light 2 is fixedly installed on the upper surface of the storage tank body 1, a connecting pipe 3 is fixedly connected to the upper surface of the storage tank body 1, a first solenoid valve 4 is fixedly installed on the outer surface of the connecting pipe 3, one end of the connecting pipe 3 is fixedly connected to a sealing monitoring tube 5, the outer surface of the sealing monitoring tube 5 is fixedly connected to a pressure relief pipe 6, and a second solenoid valve 7 is fixedly installed on the outer surface of the pressure relief pipe 6;

[0022] The inner wall of the sealing monitoring tube 5 is provided with a pressure monitoring device, and the pressure monitoring device comprises an annular movable block 8 , the outer surface of the annular movable block 8 is movably sleeved with the inner wall of the sealing monitoring tube 5 .

[0023] Furthermore, an annular pressure sensor 81 is fixedly installed on the lower surface of the annular movable block 8, an annular piston block 82 is fixedly installed on the lower surface of the annular pressure sensor 81, an air guide tube 83 is fixedly sleeved on the inner wall of the annular piston block 82, and one end of the pressure relief pipe 6 is connected to the external tank body, so as to facilitate the role of pressure relief and gas transmission when the pressure exceeds the standard. The annular pressure sensor 81 monitors the extrusion pressure of the gas on the annular piston block 82, and monitors the sealing condition through the pressure value.

[0024] Furthermore, one end of the air guide tube 83 passes through and extends to the upper surface of the annular movable block 8, and a support spring 84 is fixedly connected to the upper surface of the annular movable block 8. One end of the support spring 84 is fixedly connected to the inner top wall of the sealing monitoring tube 5. The inner wall of the air guide tube 83 is fixedly sleeved with an annular support block 85, and the support spring 84 plays a role in driving the annular movable block 8 to reset and move.

[0025] Furthermore, the upper surface of the annular support block 85 is provided with through holes 86 distributed in a circular array, and the inner wall of the annular support block 85 is movably sleeved with a driving rod 87, one end of the driving rod 87 is fixedly connected to a movable piston block 88, the through holes 86 play a role in cooperating in pressure relief and exhaust, and the driving rod 87 plays a role in cooperating in pushing out the movable piston block 88.

[0026] Furthermore, the outer surface of the movable piston block 88 is movably connected to the inner wall of the air guide tube 83, and the outer surface of the driving rod 87 is movably connected to a contraction spring 89, one end of the contraction spring 89 is fixedly connected to the upper surface of the movable piston block 88, and the restoring elastic force of the contraction spring 89 drives the movable piston block 88 to reset and move.

[0027] Furthermore, the other end of the contraction spring 89 is fixedly connected to the lower surface of the annular support block 85, and a limiting sleeve 810 is fixedly installed on the inner top wall of the sealing monitoring tube 5. The inner wall of the limiting sleeve 810 is movably sleeved with a guide column 811, which plays a role of limiting movement within the limiting sleeve 810.

[0028] Furthermore, the lower surface of the guide column 811 is fixedly connected to the other end of the driving rod 87, and a small servo electric cylinder 812 is fixedly installed on the inner top wall of the sealing monitoring tube 5. One end of the piston rod of the small servo electric cylinder 812 is fixedly connected to an adjusting block 813. The outer surface of the adjusting block 813 is movably connected to the inner wall of the limiting sleeve. The lifting and lowering adjustment movement of the adjusting block 813 plays a role in adjusting the mobile terminal position of the guide column 811.

[0029] Through the pressure monitoring device, the air pressure inside the storage tank body can be automatically monitored, so that the sealing of the storage tank body 1 can be monitored in real time, and it has the effect of automatically relieving pressure and exhausting when the air pressure in the storage tank body 1 exceeds the standard, thereby solving the problem that the gas sensor cannot detect and alarm the leaked gas in time, which may easily cause safety hazards.

[0030] Working principle: Step 1, by opening the first solenoid valve 4, the gas in the storage tank enters the sealed monitoring tube 5 through the connecting pipe 3, and the gas pressure generated by the gas first squeezes the movable piston block 88, causing the contraction spring 89 to contract, and drives the guide column 811 to move upward through the driving rod 87, so that one end of the guide column 811 contacts the adjustment block 813;

[0031] Step 2: At the same time, the air pressure will squeeze the annular piston block 82, so that the annular piston block 82 drives the support spring 84 to contract through the annular pressure sensor 81 and the annular movable block 8, and the generated squeezing force is numerically displayed by the annular pressure sensor 81. The sealing inside the storage tank is determined by the stable pressure value. When the stable value begins to decrease continuously, the alarm light 2 sounds to remind the maintenance personnel that the storage tank body 1 is leaking;

[0032] Step 3: When the gas pressure inside the storage tank body 1 continues to rise, the annular piston block 82 will continue to rise and move. When the value of the pressure sensor exceeds the preset maximum value, the second solenoid valve 7 opens. At this time, the gas pressure exceeds the standard. While the annular piston block 82 rises and moves, the driving rod 87 will push the movable piston block 88 out of the air pipe 83 through the cooperation of the adjustment block 813 and the guide column 811. At this time, the gas is dredged through the air pipe 83 and the through hole 86, and the gas is discharged into the external standby tank through the pressure relief pipe 6;

[0033] Step four, when the air pressure decreases after discharge, the downward movement of the annular piston block 82 will cause the movable piston block 88 to reset and move into the air duct 83, and the second solenoid valve 7 will be closed. The staff can start the small servo electric cylinder 812 to retract the piston rod, thereby driving the adjustment block 813 to move up and down, and adjust the maximum pressure value of the pressure relief by changing the position of the adjustment block 813.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An LNG storage tank sealing monitoring and early warning device, comprising a storage tank body (1), characterized in that: An alarm light (2) is fixedly mounted on the upper surface of the storage tank body (1); a connecting pipe (3) is fixedly connected to the upper surface of the storage tank body (1); a first solenoid valve (4) is fixedly mounted on the outer surface of the connecting pipe (3); one end of the connecting pipe (3) is fixedly connected to a sealing monitoring tube (5); the outer surface of the sealing monitoring tube (5) is fixedly connected to a pressure relief pipe (6); and a second solenoid valve (7) is fixedly mounted on the outer surface of the pressure relief pipe (6); The inner wall of the sealing monitoring tube (5) is provided with a pressure monitoring device, and the pressure monitoring device comprises an annular movable block (8), the outer surface of the annular movable block (8) being movably sleeved with the inner wall of the sealing monitoring tube (5).

2. The LNG storage tank sealing monitoring and early warning device according to claim 1 is characterized in that: An annular pressure sensor (81) is fixedly mounted on the lower surface of the annular movable block (8), an annular piston block (82) is fixedly mounted on the lower surface of the annular pressure sensor (81), and an air guide tube (83) is fixedly sleeved on the inner wall of the annular piston block (82).

3. The LNG storage tank sealing monitoring and early warning device according to claim 2 is characterized in that: One end of the air guide tube (83) passes through and extends to the upper surface of the annular movable block (8), the upper surface of the annular movable block (8) is fixedly connected to a support spring (84), one end of the support spring (84) is fixedly connected to the inner top wall of the sealing monitoring tube (5), and the inner wall of the air guide tube (83) is fixedly sleeved with an annular support block (85).

4. The LNG tank sealing monitoring and early warning device according to claim 3 is characterized in that: The upper surface of the annular support block (85) is provided with through holes (86) distributed in an annular array, the inner wall of the annular support block (85) is movably sleeved with a driving rod (87), and one end of the driving rod (87) is fixedly connected to a movable piston block (88).

5. The LNG storage tank sealing monitoring and early warning device according to claim 4 is characterized in that: The outer surface of the movable piston block (88) is movably sleeved with the inner wall of the air guide tube (83), and the outer surface of the driving rod (87) is movably sleeved with a contraction spring (89), and one end of the contraction spring (89) is fixedly connected to the upper surface of the movable piston block (88).

6. The LNG storage tank sealing monitoring and early warning device according to claim 5 is characterized in that: The other end of the contraction spring (89) is fixedly connected to the lower surface of the annular support block (85), and a limiting sleeve (810) is fixedly installed on the inner top wall of the sealing monitoring tube (5), and a guide column (811) is movably sleeved on the inner wall of the limiting sleeve (810).

7. The LNG tank sealing monitoring and early warning device according to claim 6 is characterized in that: The lower surface of the guide column (811) is fixedly connected to the other end of the driving rod (87); a small servo electric cylinder (812) is fixedly installed on the inner top wall of the sealing monitoring cylinder (5); one end of the piston rod of the small servo electric cylinder (812) is fixedly connected to an adjustment block (813); and the outer surface of the adjustment block (813) is movably sleeved with the inner wall of the limiting sleeve.

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