Nitrogen sealing device for hazardous chemical substance storage tank

Abstract

The utility model discloses a nitrogen sealing device for a hazardous chemical substance storage tank, and relates to the related technical field of hazardous chemical substance storage. The device comprises a tank body, a partition plate, a transparent window and an upper through pipe, the partition plate is fixed in the middle of the inner wall of the tank body, a communicating pipe is fixed in the center of the bottom of the partition plate, the transparent window is fixed on the periphery of the tank body below the partition plate in a penetrating mode, and a waste gas pipe and an air inlet pipe are fixedly communicated with the periphery of the tank body and symmetrical to the transparent window. The end, away from the tank body, of the gas inlet pipe fixedly communicates with a second pressure one-way valve, and the end, away from the tank body, of the waste gas pipe fixedly communicates with a first pressure one-way valve. Through the arrangement of the tank body, the partition plate, the transparent window and the upper through pipe, the problems that in the using process of the nitrogen sealing device, nitrogen needing to be discharged due to the air pressure change of the storage tank is directly conveyed into treatment equipment, leakage is likely to be caused, and when the steam pressure of hazardous chemical substances in the storage tank is too large in work, leakage is likely to happen are solved. And the hazardous chemical substances are easy to break through the sealing of the sealing liquid.

Description

Technical Field

[0001] The utility model belongs to the technical field related to storage of hazardous chemicals, and in particular relates to a nitrogen sealing device for hazardous chemical storage tanks. Background Art

[0002] Dangerous chemicals refer to highly toxic chemicals and other chemicals that are toxic, corrosive, explosive, flammable, and combustion-supporting, and are harmful to the human body, facilities, and the environment. The storage of hazardous chemicals requires the use of corresponding inert gas sealing devices. First, to prevent the volatile gas from dispersing into the atmosphere and polluting the environment; second, to prevent contact with the air and isolate oxygen to achieve safety. The commonly used sealing device is the nitrogen sealing device. The nitrogen sealing device is a device used to maintain the stable pressure of the gas phase space in the storage tank. Its main function is to inject nitrogen into the storage tank to squeeze the air in the tank, thereby preventing the material from contacting with oxygen and reducing the risk of oxidation of the material. At the same time, it maintains the pressure balance in the storage tank. However, it still has the following disadvantages in actual use:

[0003] When the nitrogen sealing device is in use, nitrogen is directly transported to the storage tank, which will cause nitrogen to mix into the storage tank. After working for a long time, the steam generated by hazardous chemicals is directly transported to the processing equipment for processing, causing the working pressure of the processing equipment to be high and prone to leakage;

[0004] During the use of the nitrogen sealing device, it needs to be sealed with the help of sealing liquid. However, when the vapor pressure of hazardous chemicals is too high during the operation of the sealing liquid, it is easy for the hazardous chemicals to break through the seal of the sealing liquid and cause leakage of hazardous chemicals. Utility Model Content

[0005] The utility model aims to provide a nitrogen sealing device for hazardous chemical storage tanks. By arranging a tank body, a partition, a transparent window and an upper through pipe, the utility model solves the problem that when the nitrogen sealing device is used, the nitrogen gas that needs to be discharged due to the change of the gas pressure in the storage tank is directly transported to the processing equipment, which is easy to cause leakage. In addition, when the vapor pressure of hazardous chemicals in the storage tank is too large during operation, it is easy to cause the hazardous chemicals to break through the seal of the sealing liquid.

[0006] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0007] The utility model discloses a nitrogen sealing device for a hazardous chemical storage tank, comprising a tank body, a partition, a transparent window and an upper through pipe, wherein a partition is fixed at the middle of an inner wall of the tank body, a connecting pipe is fixed at the bottom center of the partition, a transparent window is fixed through the circumference of the tank body below the partition, an exhaust pipe and an intake pipe are fixedly connected at positions symmetrical to the transparent window on the circumference of the tank body, the exhaust pipe and the intake pipe are parallel to each other, and the exhaust pipe is arranged above the intake pipe, one end of the intake pipe away from the tank body is fixedly connected with a second pressure check valve, one end of the exhaust pipe away from the tank body is fixedly connected with a first pressure check valve, and the upper through pipe is symmetrically fixed at the top of the tank body, when working, the partition is fixed therein through the tank body, a nitrogen sealing position in the tank body and steam entering after being connected with the storage tank are separated by the partition, the height of the sealing liquid in the storage tank is observed through the transparent window, and the storage tank and nitrogen conveying equipment are connected through the upper through pipe.

[0008] Furthermore, a fixed opening is opened on the circumference of the tank body corresponding to the position of the transparent window, the transparent window is fixed in the fixed opening, the output end of the pressure check valve 1 is fixedly connected with a connecting pipe, and the input end of the pressure check valve 2 is fixedly connected with a connecting pipe. When the tank body is working, the transparent window is fixed through the fixed opening, and nitrogen and air output from the tank body are transported through the connecting pipe.

[0009] Furthermore, a sewage pipe is fixed through the center of the bottom end of the tank body, and an electric control valve 1 is fixed on the peripheral side of the sewage pipe. When the tank body is working, the sewage in the tank body is discharged through the sewage pipe.

[0010] Furthermore, a connecting hole is provided in the partition along the center line in the vertical direction, and the connecting hole is connected with the connecting pipe. The partition connects the tank body above it with the connecting pipe through the connecting hole.

[0011] Furthermore, the outer surface of the transparent window is printed with printed scales, the exhaust pipe and the air intake pipe are arranged close to the partition and both the exhaust pipe and the air intake pipe are arranged below the partition, and when the transparent window is working, the liquid level in the storage tank is determined by observing the printed scales.

[0012] Furthermore, the bottom ends of the upper through pipes are connected to the tank body, and the circumferential sides of the two upper through pipes are fixed with electric control valves 2. When the upper through pipes are working, the on-off is controlled by the electric control valves 2.

[0013] The utility model has the following beneficial effects:

[0014] The utility model solves the problem that the nitrogen gas discharged from the storage tank due to the pressure change of the storage tank is directly transported to the processing equipment, which is easy to cause leakage, by arranging the tank body and the partition. When the pressure in the storage tank increases, the vapor evaporated from the content of the storage tank is transported to the tank body through an upper through pipe, and is transported to the connecting pipe through the connecting hole, pushing the sealing liquid level in the connecting pipe to drop, so that the pressure of the nitrogen stored under the partition increases. When the pressure check valve is opened, the nitrogen is transported to the pressure check valve through the exhaust pipe and then to the connecting pipe, and then transported to the gas processing equipment through the connecting pipe for processing. When the pressure in the storage tank decreases, the steam of the existing tank contents in the tank body is transported back to the tank through the upper pipe. The pressure in the tank body drops, causing the liquid level in the connecting pipe to rise, and the tank pressure below the partition drops. At this time, the pressure check valve 2 opens, and the nitrogen is transported to the pressure check valve 2 through the connecting pipe, and then to the air inlet pipe, and then to the tank body through the air inlet pipe, maintaining the liquid level in the connecting pipe stable, preventing the steam of the tank contents above the partition from entering the nitrogen contained below the partition, so that the change of tank air pressure during the use of the nitrogen sealing device will not cause leakage of hazardous chemical vapors, and it is safer to use.

[0015] The utility model solves the problem that when the vapor pressure of hazardous chemicals in the storage tank is too large during the operation of the nitrogen sealing device, the hazardous chemicals are easily caused to break through the seal of the sealing liquid. During operation, the required height difference between the sealing liquid level and the bottom of the connecting pipe after the bottom of the connecting pipe is immersed is calculated, and then the second electric control valve on the upper connecting pipe connected to the storage tank is kept closed, and the second electric control valve on the upper connecting pipe connected to the sealing liquid replenishing device is opened to transport the sealing liquid into the tank body, and the sealing liquid is transported into the connecting pipe through the connecting hole on the partition, and transported into the tank body below the partition, and the liquid height reading of the printed scale on the transparent window is observed until the reading difference between the bottom of the connecting pipe and the liquid level is greater than the calculated h, and then the second electric control valve on the upper connecting pipe connected to the sealing liquid replenishing device can be closed, and the second electric control valve on the upper connecting pipe connected to the storage tank can be opened to complete the operation, so that during the operation, when the storage tank is at the maximum air pressure, the steam in the storage tank content will not break through the seal of the sealing liquid, and the use is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a partially cutaway structural stereogram of a nitrogen sealing device for hazardous chemical storage tanks;

[0018] Figure 2 It is a three-dimensional diagram of the structure with the tank part cut away;

[0019] Figure 3 It is a three-dimensional diagram of the partition structure;

[0020] Figure 4 It is a three-dimensional diagram of the transparent window structure;

[0021] Figure 5 It is a three-dimensional diagram of the upper through-tube structure;

[0022] Figure 6 This is a three-dimensional diagram of the complete structure of a nitrogen sealing device for hazardous chemical storage tanks.

[0023] Reference numerals:

[0024] 1. Tank body; 101. Fixed port; 102. Exhaust pipe; 103. Pressure check valve 1; 104. Connecting pipe; 105. Inlet pipe; 106. Pressure check valve 2; 107. Drain pipe; 108. Electric control valve 1; 2. Partition; 201. Connecting hole; 202. Connecting pipe; 3. Transparent window; 301. Printed scale; 4. Upper connecting pipe; 401. Electric control valve 2. DETAILED DESCRIPTION

[0025] 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 of 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. Specific embodiment 1

[0026] See also Figure 1-3The utility model is a nitrogen sealing device for a hazardous chemical storage tank, comprising a tank body 1, a partition 2, a transparent window 3 and an upper through pipe 4. A partition 2 is fixed to the middle of the inner wall of the tank body 1. When the tank body 1 is working, the partition 2 is fixed therein, and the gas entering the tank body 1 is separated by the partition 2. A connecting pipe 202 is fixed to the bottom center of the partition 2. When the connecting pipe 202 is working, it is immersed in the sealing liquid below the partition 2 in the tank body 1. A transparent window 3 is fixed through the side of the tank body 1 below the partition 2. When the transparent window 3 is working, the liquid level in the tank body 1 can be observed. An exhaust pipe 102 and an intake pipe 105 are fixed and connected at a position symmetrical to the transparent window 3 on the side of the tank body 1. The exhaust pipe 102 and the intake pipe 105 are parallel to each other, and the exhaust pipe 102 is arranged above the intake pipe 105. The intake pipe 105 is fixed at one end away from the tank body 1. It is connected with a pressure check valve 106, and one end of the exhaust pipe 102 away from the tank body 1 is fixedly connected with a pressure check valve 103. When working, the over-pressure air below the partition 2 in the tank body 1 is transported to the exhaust pipe 102, and the pressure check valve 103 transports the over-pressure gas in the tank body 1 to the connecting pipe 104 at its output end. When the air pressure in the tank body 1 below the partition 2 is reduced, nitrogen is input from the connecting pipe 104 at its input end through the pressure check valve 106, and then transported to the tank body 1 in one direction to maintain the air pressure balance in the tank body 1 below the partition 2. The top of the tank body 1 is symmetrically fixed with upper through pipes 4, and the tops of the two upper through pipes 4 are respectively connected to the hazardous chemical storage tank and the equipment for replenishing the sealing liquid. After the electric control valve 2 401 on the corresponding upper through pipe 4 is opened by the equipment for replenishing the sealing liquid, the sealing liquid is replenished in the tank body 1.

[0027] Specifically, a fixed port 101 is provided on the periphery of the tank body 1 corresponding to the position of the transparent window 3, the transparent window 3 is fixed in the fixed port 101, the output end of the pressure check valve 1 103 is fixedly connected with a connecting pipe 104, and the input end of the pressure check valve 2 106 is fixedly connected with a connecting pipe 104. When the tank body 1 is working, the transparent window 3 is fixed through the fixed port 101, the connecting pipe 104 at the output end of the pressure check valve 1 03 is connected with the gas processing equipment, and the gas output by the pressure check valve 1 03 is output to the gas processing equipment, and the connecting pipe 104 at the input end of the pressure check valve 2 106, which is away from the pressure check valve 2 106, is connected with a nitrogen replenishing device, and the nitrogen is transported to the pressure check valve 2 106 through the connecting pipe 104, and is transported to the air inlet pipe 105 through the pressure check valve in one direction, and is transported to the tank body 1 through the air inlet pipe 105.

[0028] Furthermore, a drain pipe 107 is fixed through the center of the bottom end of the tank body 1, and an electric control valve 108 is fixed on the side of the drain pipe 107. The dirt in the tank body 1 is deposited at the inner bottom, and after working for a certain period of time, the electric control valve 108 is started to open the drain pipe 107. At this time, the sealing liquid and dirt in the tank body 1 are discharged through the drain pipe 107.

[0029] The operation process of this embodiment is as follows: during operation, when the pressure in the storage tank increases, the vapor evaporated from the contents of the storage tank is transported to the tank body 1 through an upper through pipe 4, and is transported to the connecting pipe 202 through the connecting hole 201, pushing the sealing liquid level in the connecting pipe 202 down, so that the pressure of the nitrogen stored under the partition 2 increases, the pressure check valve 103 opens, and the nitrogen is transported to the pressure check valve 103 through the exhaust pipe 102 and transported to the connecting pipe 104, and then transported to the gas processing equipment for processing. When the pressure in the storage tank increases, the pressure in the pressure check valve 103 increases, and the pressure check valve 103 opens, and the nitrogen is transported to the pressure check valve 103 through the exhaust pipe 102 and transported to the connecting pipe 104, and then transported to the gas processing equipment for processing. When the pressure is reduced, the steam of the existing tank contents in the tank body 1 is transported back to the tank through the upper pipe 4, and the pressure in the tank body 1 drops, causing the liquid level in the connecting pipe 202 to rise, and the pressure of the tank body 1 below the partition 2 drops. At this time, the pressure check valve 106 opens, and the nitrogen is transported to the pressure check valve 106 through the connecting pipe 104, and then transported to the air inlet pipe 105, and then transported to the tank body 1 through the air inlet pipe 105, so as to maintain the liquid level in the connecting pipe 202 stable and prevent the steam of the tank contents above the partition 2 from entering the nitrogen contained below the partition 2. Specific embodiment 2

[0030] See also Figure 1-6 On the basis of the specific embodiment 1, a connecting hole 201 is opened in the partition 2 along the center line in the vertical direction, and the connecting hole 201 is connected with the connecting pipe 202. When the partition 2 is working, the space in the tank body 1 above the partition 2 is connected with the connecting pipe 202 through the connecting hole 201.

[0031] Specifically, the outer surface of the transparent window 3 is printed with a printed scale 301, the exhaust pipe 102 and the intake pipe 105 are arranged close to the partition 2 and both the exhaust pipe 102 and the intake pipe 105 are arranged below the partition 2, and when the transparent window 3 is working, the liquid level in the tank body 1 is displayed by the printed scale 301.

[0032] Furthermore, the bottom ends of the upper through pipes 4 are connected to the tank body 1 , and the two upper through pipes 4 are fixed with electric control valves 401 around their sides, and the upper through pipes 4 are controlled to work on and off by the electric control valves 401 .

[0033] The operation process of this embodiment is as follows: after the tank body 1 is installed on the outside of the storage tank, the two connecting pipes 104 are connected to the gas processing equipment and the equipment for replenishing nitrogen respectively, and the two upper pipes 4 are connected to the storage tank and the equipment for replenishing sealing liquid respectively, the maximum air pressure generated by the equipment stored in the storage tank during storage work is determined, and after selecting a suitable sealing liquid, the density of the sealing liquid is determined, and then the pressure calculation formula according to different depths of the liquid is P=ρgh, in which P represents the maximum air pressure generated by the storage tank during storage work, ρ (rho) represents the density of the sealing liquid, g represents the acceleration of gravity (usually 9.8m / s²), and h represents the height difference between the sealing liquid level and the bottom end of the connecting pipe 202. After the bottom end of the connecting pipe 202 and the bottom end of the connecting pipe 202 are immersed, the sealing liquid level and the connecting pipe 202 are calculated. 02, then keep the electric control valve 2 401 on the upper through pipe 4 connected to the storage tank closed, open the electric control valve 2 401 on the upper through pipe 4 connected to the sealing liquid replenishing equipment, and transport the sealing liquid to the tank body 1. The sealing liquid is transported to the connecting pipe 202 through the connecting hole 201 on the partition 2, and transported to the tank body 1 below the partition 2. Observe the liquid height reading of the printed scale 301 on the transparent window 3 until the reading difference between the bottom position of the connecting pipe 202 and the liquid level is greater than the calculated h, then close the electric control valve 2 401 on the upper through pipe 4 connected to the sealing liquid replenishing equipment, open the electric control valve 2 401 on the upper through pipe 4 connected to the storage tank, and complete the work. During the working process, when the storage tank is at the maximum air pressure, the steam in the storage tank content will not break through the seal of the sealing liquid.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A nitrogen sealing device for a hazardous chemical storage tank, comprising a tank body (1), a partition (2), a transparent window (3) and an upper through pipe (4), characterized in that: A partition (2) is fixed to the middle of the inner wall of the tank body (1), a connecting pipe (202) is fixed to the center of the bottom of the partition (2), a transparent window (3) is fixed through the circumference of the tank body (1) below the partition (2), an exhaust pipe (102) and an intake pipe (105) are fixedly connected at a position symmetrical to the transparent window (3) on the circumference of the tank body (1), the exhaust pipe (102) and the intake pipe (105) are parallel to each other, and the exhaust pipe (102) is arranged above the intake pipe (105), one end of the intake pipe (105) away from the tank body (1) is fixedly connected to a second pressure check valve (106), and one end of the exhaust pipe (102) away from the tank body (1) is fixedly connected to a first pressure check valve (103), and an upper connecting pipe (4) is symmetrically fixed to the top of the tank body (1).

2. A nitrogen sealing device for hazardous chemical storage tanks according to claim 1, characterized in that: A fixed opening (101) is provided on the circumferential side of the tank body (1) corresponding to the position of the transparent window (3); the transparent window (3) is fixed in the fixed opening (101); the output end of the first pressure check valve (103) is fixedly connected to a connecting pipe (104); and the input end of the second pressure check valve (106) is fixedly connected to a connecting pipe (104).

3. A nitrogen sealing device for hazardous chemical storage tanks according to claim 1, characterized in that: A sewage discharge pipe (107) is fixedly passed through the center of the bottom end of the tank body (1), and an electric control valve (108) is fixedly disposed on the peripheral side of the sewage discharge pipe (107).

4. A nitrogen sealing device for hazardous chemical storage tanks according to claim 1, characterized in that: A communication hole (201) is provided in the partition (2) along the center line in the vertical direction, and the communication hole (201) is connected to the communication pipe (202).

5. The nitrogen sealing device for hazardous chemical storage tanks according to claim 1 is characterized in that: The outer surface of the transparent window (3) is printed with printed scales (301), and the exhaust pipe (102) and the intake pipe (105) are arranged close to the partition (2), and the exhaust pipe (102) and the intake pipe (105) are both arranged below the partition (2).

6. A nitrogen sealing device for hazardous chemical storage tanks according to claim 1, characterized in that: The bottom ends of the upper through pipes (4) are both in communication with the tank body (1), and a second electric control valve (401) is fixed on the circumference of the two upper through pipes (4).

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