Safety pressure relief device for liquefied natural gas storage tank

Abstract

The utility model relates to the technical field of safety of liquefied natural gas storage tanks, in particular to a safety pressure relief device of a liquefied natural gas storage tank. The utility model provides a safety pressure relief device of a liquefied natural gas storage tank. The safety pressure relief device comprises a supporting frame, a storage tank body, a pressure relief pipe, an electromagnetic pressure relief valve, a pressure sensor and the like. The number of the supporting frames is two, a storage tank body is fixedly connected between the tops of the supporting frames, the right side of the storage tank body is connected and communicated with a pressure relief pipe, an electromagnetic pressure relief valve is fixedly connected to the pressure relief pipe, and a pressure sensor is fixedly connected into the storage tank body. The pressure sensor and the controller are matched, the pressure sensor monitors the internal pressure of the storage tank in real time, and when the pressure exceeds a preset safety value, the controller can quickly start the electromagnetic pressure relief valve, automatically open the pressure relief pipe and release excessive pressure into the air storage tank, so that pressure relief is quickly started when the pressure is abnormal, and the safety of the storage tank is ensured. And meanwhile, the pressure relief accuracy is also improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the security technical field of liquefied natural gas storage tank especially relates to a liquefied natural gas storage tank safety pressure relief device. BACKGROUND

[0002] Liquefied natural gas storage tank is used for storing liquefied natural gas special equipment, and the liquefied natural gas is formed by cooling natural gas to about-162 DEG C (-260 DEG F) and liquefying, and the volume is reduced to about 1 / 600 of gaseous state, facilitating storage and transportation, and the design and manufacture of liquefied natural gas storage tank need to meet the strict requirements of extremely low temperature, high pressure and safety.

[0003] During the storage and transportation of liquefied natural gas storage tank, due to the change of external environment temperature, equipment failure or operation error, the internal pressure of the storage tank may be abnormally increased, and if the pressure exceeds the design bearing range of the storage tank, serious safety accidents such as storage tank rupture and explosion may be caused. The existing pressure relief device is mostly mechanical safety valve, which has the problems of slow response speed, low pressure relief accuracy and easy corrosion.

[0004] Therefore, a liquefied natural gas storage tank safety pressure relief device with rapid response, high reliability and corrosion resistance is designed. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of slow response speed, low pressure relief accuracy and easy corrosion of the existing pressure relief device, the utility model provides a liquefied natural gas storage tank safety pressure relief device.

[0006] The technical implementation scheme of the utility model is: a liquefied natural gas storage tank safety pressure relief device, comprising a support frame, a storage tank body, a pressure relief pipe, an electromagnetic pressure relief valve, a pressure sensor and a controller, the support frame has two, the support frame top is fixedly connected with the storage tank body, the right side of the storage tank body is connected and communicated with the pressure relief pipe, the pressure relief pipe is fixedly connected with the electromagnetic pressure relief valve, the inside of the storage tank body is fixedly connected with the pressure sensor, and the front side of the support frame is fixedly connected with the controller.

[0007] Optionally, it further comprises a shell, a piston block, a movable rod and an elastic piece, the front side of the storage tank body is connected and communicated with the shell, the inside of the shell is slidably connected with the piston block, the front side of the piston block is fixedly connected with the movable rod, the movable rod slides in the shell, the piston block and the shell are connected with the elastic piece, and the elastic piece is wound on the movable rod.

[0008] Optionally, it further comprises a protective shell, a sliding plate, a gas storage tank and a pressure monitor, the front side of the support frame is placed with the protective shell, the right side of the protective shell is rotatably connected with the sliding plate, the inside of the protective shell 12 is placed with the gas storage tank 14, the sliding plate and the protective shell surround the gas storage tank, and the pressure relief pipe is provided with the pressure monitor at the position above the gas storage tank.

[0009] Optionally, the right side of the top of the storage tank body is fixedly connected with an indicator lamp.

[0010] Optionally, a protective sleeve is arranged on the pressure relief pipe.

[0011] Optionally, the electromagnetic pressure relief valve, the pressure sensor and the pressure monitor are electrically connected with the controller.

[0012] Optionally, the pressure relief pipe and the electromagnetic pressure relief valve are made of austenitic stainless steel.

[0013] The utility model has the advantages of the following: 1, the utility model discloses a pressure sensor and the cooperation of controller, and the pressure sensor real -time monitoring storage tank internal pressure.

[0014] 2, the utility model discloses a protective shell and sliding plate are equipped with, when the staff needs close -range operation, can pull the sliding plate and make it with the protective shell close adhesion, form the physical barrier, prevent the harm to the staff because of accidental explosion, in addition, the equipment still sets up the fault indicator lamp, when the electric element fails, can remind the staff to check and maintain in time, further improve the security and reliability of operation.

[0015] 3, in the case where the electric element can not normally work, the equipment can carry out pressure relief operation through the mechanical pressure relief valve, when the pressure in the storage tank is too high, the gas pressure pushes the piston block, and the elastic piece is compressed, and the movable rod is slid and opens the pressure relief port, and the excessive pressure is released to the inside of the gas storage tank, and the manual pressure relief function ensures that the equipment can still reliably operate under the fault condition, and avoids the security risk caused by equipment failure. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the three-dimensional structure schematic view of support frame, storage tank body and pressure relief pipe etc.

[0017] Figure 2 It is the three-dimensional structure schematic view of storage tank body, pressure sensor and shell etc.

[0018] Figure 3 It is the three-dimensional structure schematic view of piston block, movable rod and elastic piece etc.

[0019] Figure 4 It is the three-dimensional structure schematic view of gas storage tank, pressure monitor and indicator lamp etc.

[0020] Figure 5The opening state diagram of the sliding plate is shown.

[0021] The meanings of the reference numerals in the drawing are as follows: 1, support frame; 2, storage tank body; 3, pressure relief pipe; 4, electromagnetic pressure relief valve; 5, pressure sensor; 6, controller; 7, shell; 8, piston block; 9, movable rod; 10, elastic member; 11, pressure relief opening; 12, protective shell; 13, sliding plate; 14, gas storage tank; 15, pressure monitor; 16, indicator lamp. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described in further detail below in combination with the drawings. It is hereby declared that the up, down, left, right, front, back, inner and outer directions appearing or about to appear in the text of the utility model are based on the drawings of the utility model, and are not specific limitations on the utility model.

[0023] Embodiment: a liquefied natural gas storage tank safety pressure relief device, as shown in Figure 1 and Figure 2 The utility model discloses a liquefied natural gas storage tank safety pressure relief device, which comprises a support frame 1, a storage tank body 2, a pressure relief pipe 3, an electromagnetic pressure relief valve 4, a pressure sensor 5 and a controller 6.

[0024] As shown in Figure 3 The utility model discloses a liquefied natural gas storage tank safety pressure relief device, which comprises a support frame 1, a storage tank body 2, a pressure relief pipe 3, an electromagnetic pressure relief valve 4, a pressure sensor 5 and a controller 6.

[0025] As shown in Figure 4 and Figure 5As shown, it also includes protective shell 12, sliding plate 13, gas tank 14, pressure monitor 15 and indicator light 16, the front side support frame 1 front is placed with protective shell 12, the right side of protective shell 12 is rotatably connected with sliding plate 13, sliding plate 13 and protective shell 12 enclose gas tank 14, pressure monitor 15 is arranged at the position above gas tank 14 of pressure release pipe 3, pressure monitor 15 is electrically connected with controller 6, pressure monitor 15 monitors the pressure inside gas tank 14, the top right side of storage tank body 2 is connected with indicator light 16 by screw, and indicator light 16 is electrically connected with controller 6.

[0026] When the staff uses the device, first of all needs to open controller 6, and controller 6 continuously monitors the pressure of liquefied natural gas inside storage tank body 2 through pressure sensor 5, in normal circumstances, electromagnetic pressure relief valve 4 remains closed state.When the internal pressure of the tank exceeds the preset safety value, the pressure sensor 5 transmits a signal to the controller 6, and the controller 6 immediately starts the electromagnetic pressure relief valve 4, opens the pressure relief pipe 3, and releases the excess natural gas into the gas tank 14, so as to ensure that the internal pressure of the storage tank body 2 returns to the safe range.

[0027] During the pressure relief process, pressure monitor 15 continuously monitors the internal pressure of gas tank 14 to avoid the risk of explosion caused by excessive pressure. In order to further improve the safety, the device is equipped with protective shell 12 and sliding plate 13, when the staff needs to operate closely, the sliding plate 13 can be pulled to make it closely adhere to the protective shell 12, to prevent accidental explosion from causing harm to the staff.

[0028] If the electrical components on the device fail, the fault indicator light 16 will light up, prompting the staff to check and repair. In the case of electrical components that cannot work normally, mechanical pressure relief valve can be used for pressure relief operation. When the internal pressure of the storage tank body 2 is too high, the gas pressure will push the piston block 8, compress the elastic member 10, make the movable rod 9 slide in the cavity of the shell 7, so as to open the pressure relief port 11, and the excess pressure will be released into the gas tank 14 through the pressure relief pipe 3, to complete the pressure relief work.

[0029] The above only describes the embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A safety pressure relief device for a liquefied natural gas storage tank, characterized in that: It includes a support frame (1), a storage tank body (2), a pressure relief pipe (3), an electromagnetic pressure relief valve (4), a pressure sensor (5), and a controller (6). There are two support frames (1). The storage tank body (2) is fixedly connected between the top of the support frames (1). The right side of the storage tank body (2) is connected to and connected to the pressure relief pipe (3). The electromagnetic pressure relief valve (4) is fixedly connected to the pressure relief pipe (3). The pressure sensor (5) is fixedly connected inside the storage tank body (2). The controller (6) is fixedly connected to the front support frame (1).

2. A safety pressure relief device for a liquefied natural gas storage tank according to claim 1, characterized in that: It also includes a shell (7), a piston block (8), a movable rod (9) and an elastic element (10). The front side of the tank body (2) is connected to and communicates with the shell (7). The piston block (8) is slidably connected inside the shell (7). The movable rod (9) is fixedly connected to the front side of the piston block (8). The movable rod (9) slides inside the shell (7). The elastic element (10) is connected between the piston block (8) and the shell (7), and the elastic element (10) is wrapped around the movable rod (9).

3. A safety pressure relief device for a liquefied natural gas storage tank according to claim 2, characterized in that: It also includes a protective shell (12), a sliding plate (13), an air tank (14) and a pressure monitor (15). The protective shell (12) is placed in front of the front support frame (1). The sliding plate (13) is rotatably connected to the right side of the protective shell (12). The sliding plate (13) and the protective shell (12) surround the air tank (14). The pressure relief pipe (3) is located above the air tank (14) and the pressure monitor (15) is installed.

4. A safety pressure relief device for a liquefied natural gas storage tank according to claim 3, characterized in that: An indicator light (16) is fixedly connected to the top of the storage tank body (2).

5. A safety pressure relief device for a liquefied natural gas storage tank according to claim 4, characterized in that: The pressure relief pipe (3) is equipped with a protective sleeve.

6. A safety pressure relief device for a liquefied natural gas storage tank according to claim 5, characterized in that: The electromagnetic pressure relief valve (4), pressure sensor (5), pressure monitor (15) and indicator light (16) are all electrically connected to the controller (6).

7. A safety pressure relief device for a liquefied natural gas storage tank according to claim 6, characterized in that: The pressure relief pipe (3) and the electromagnetic pressure relief valve (4) are both made of austenitic stainless steel.

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