Nitrogen injection device for secondary sealing cavity of floating roof of oil tank

Abstract

The utility model discloses an oil tank floating roof secondary sealing cavity nitrogen injection device which comprises a metal hose connector arranged on a bearing plate, the metal hose connector is communicated with a secondary sealing cavity formed by the bearing plate, a floating disc, a tank body and a sealing element, and the outer end of the metal hose connector is connected with a nitrogen injection pipe. A first pressure gauge is arranged on the nitrogen injection pipe, a plurality of combustible gas concentration sensors are arranged in the secondary sealing cavity, and the outer end part of the nitrogen injection pipe is connected with a nitrogen tank through a gas conveying pipe; a first electromagnetic valve is arranged on the gas conveying pipe; the pressure bearing plate is further provided with a deflation pipe, the deflation pipe is provided with a safety valve, and the floating disc is provided with a state sensor used for detecting the running state of the floating disc. According to the utility model, the concentration of combustible gas in the secondary sealing cavity is ensured to be at a relatively low safety value, and fire disasters are avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of nitrogen injection on the external floating roof of oil tanks, specifically a nitrogen injection device for the secondary sealed cavity of the external floating roof of oil tanks. Background Technology

[0002] With the development of my country's economy and the continuous progress of science and technology, the demand for various oil products, including crude oil, is constantly increasing. The larger the single tank volume, the lower the construction cost and the less investment required. The number of large oil tanks in China is constantly increasing. Currently, crude oil external floating roof storage tanks with a capacity of 150,000 cubic meters are widely used. Increased tank capacity reduces the footprint. According to records of 107 fires involving various types of storage tanks, 65 of these fires were caused by flammable gas mixing with air in the primary and secondary seals of the external floating roof, ignited by lightning, accounting for 61% of the accidents. Due to damage and aging of the seals in the primary and secondary seals, and large gaps between the seals and the tank wall, the concentration of flammable gas exceeding the standard within the annular space of the external floating roof seal can be ignited by lightning strikes, static electricity, sparks, etc., making it a significant ignition source for storage tank fires. Therefore, we provide a nitrogen injection device for the secondary seal cavity of the oil tank floating roof. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a nitrogen injection device for the secondary sealing cavity of an oil tank floating roof.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] This utility model discloses a nitrogen injection device for a secondary sealing cavity of an oil tank floating roof, comprising a metal flexible hose connector mounted on a pressure plate, the metal flexible hose connector communicating with a secondary sealing cavity composed of a pressure plate, a floating roof, a tank body, and sealing elements, a nitrogen injection pipe connected to the outer end of the metal flexible hose connector, and a first pressure gauge mounted on the nitrogen injection pipe; the secondary sealing cavity is equipped with multiple combustible gas concentration sensors, and the outer end of the nitrogen injection pipe is connected to a nitrogen tank via a gas delivery pipe; and a first solenoid valve is mounted on the gas delivery pipe.

[0006] The pressure plate is also equipped with a vent pipe, which is equipped with a safety valve. The floating roof is equipped with a status sensor for detecting the operating status of the floating roof.

[0007] It also includes a controller, and multiple combustible gas concentration sensors, pressure regulating valves, a first solenoid valve, a safety valve, and status sensors are all connected to the controller.

[0008] As a preferred embodiment of this utility model, the pressure plate is further provided with a second pressure gauge for detecting the internal air pressure of the secondary sealing cavity.

[0009] As a preferred technical solution of this utility model, when the combustible gas concentration value detected by one of the combustible gas concentration sensors in the secondary sealed cavity reaches the blowing value, the first solenoid valve opens to inject nitrogen into the secondary sealed cavity. At the same time, the safety valve opens and the gas containing combustible gas is discharged to the outside for recovery through the oil and gas discharge main pipe of the storage tank using the vent pipe until the combustible gas value in the secondary sealed cavity reaches the safety value, at which point the safety valve automatically closes.

[0010] As a preferred technical solution of this utility model, when the rate of change of combustible gas value detected by the combustible gas concentration sensor reaches the set value, the first solenoid valve opens and injects nitrogen into the secondary sealing chamber. At the same time, the safety valve opens and the gas containing combustible gas is discharged to the outside through the oil and gas discharge main pipe of the storage tank for recycling, until the combustible gas value in the secondary sealing chamber reaches the safe value, and until the gas pressure in the secondary sealing chamber reaches the set value, then the first solenoid valve closes; and the safety valve automatically closes.

[0011] As a preferred embodiment of this utility model, the gas pipeline is provided with a pressure regulating valve, and the pressure regulating valve is connected to the controller.

[0012] As a preferred embodiment of this invention, multiple combustible gas concentration sensors are evenly distributed within the secondary sealed cavity.

[0013] As a preferred embodiment of this utility model, the venting pipe is provided in multiple manner, and the venting ends of the multiple venting pipes are connected by an annular gas supply pipe, and the annular gas supply pipe is provided with a discharge pipe extending from the top of the oil tank.

[0014] The beneficial effects of this utility model are as follows: When the combustible gas concentration value detected by one of the multiple combustible gas concentration sensors in the secondary sealing cavity reaches the blowing value, the first solenoid valve opens to inject nitrogen into the secondary sealing cavity. At the same time, the safety valve opens and the gas containing combustible gas is discharged to the outside through the vent pipe until the combustible gas concentration in the secondary sealing cavity reaches the safe value, at which point the safety valve automatically closes. Alternatively, when the status sensor detects that the floating roof is moving up and down, the first solenoid valve opens to inject nitrogen into the secondary sealing cavity. At the same time, the safety valve opens and the gas in the secondary sealing cavity is discharged to the outside through the vent pipe, thereby ensuring that the combustible gas concentration in the secondary sealing cavity is at a low safe value. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of a nitrogen injection device for a secondary sealing cavity of an oil tank floating roof according to this utility model;

[0017] Figure 2 This is a schematic diagram of the vent pipe of a nitrogen injection device for a secondary sealing cavity of an oil tank floating roof according to this utility model;

[0018] Figure 3 This is a schematic diagram of the nitrogen injection pipe distribution structure of a nitrogen injection device for a secondary sealing cavity of an oil tank floating roof according to this utility model.

[0019] In the diagram: 1. Pressure plate; 2. Metal hose connector; 3. Floating roof; 4. Tank body; 5. Sealing element; 6. Nitrogen injection pipe; 7. Pressure regulating valve; 8. First pressure gauge; 9. Combustible gas concentration sensor; 10. Gas delivery pipe; 11. Nitrogen tank; 12. First solenoid valve; 13. Safety valve; 14. Controller; 15. Second pressure gauge; 16. Venting pipe; 17. Annular gas delivery pipe; 18. Status sensor. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example: Figure 1 , Figure 2 , Figure 3 As shown, this utility model discloses a nitrogen injection device for a secondary sealing cavity of an oil tank floating roof. A metal hose connector 2 is connected to a pressure plate 1. The metal hose connector 2 communicates with the secondary sealing cavity formed by the pressure plate 1, floating roof 3, tank body 4, and sealing element 5. A nitrogen injection pipe 6 is connected to the outer end of the metal hose connector 2, and a first pressure gauge 8 is installed on the nitrogen injection pipe 6. The secondary sealing cavity is equipped with multiple combustible gas concentration sensors 9, and the outer end of the nitrogen injection pipe 6 is connected to a nitrogen tank 11 via a gas delivery pipe 10. A first solenoid valve 12 is installed on the gas delivery pipe 10.

[0022] The pressure plate 1 is also provided with a vent pipe 16, and the vent pipe 16 is provided with a safety valve 13; the floating plate 3 is provided with a status sensor 18 for detecting the operating status of the floating plate 3.

[0023] It also includes a controller, multiple combustible gas concentration sensors 9, a pressure regulating valve 7, a first solenoid valve 12, a safety valve 13, and a status sensor 18, all of which are connected to the controller. The status sensor 18 can be a vibration sensor, because the floating disk 3 will vibrate during its movement.

[0024] The pressure plate 1 is also equipped with a second pressure gauge 15 for detecting the internal air pressure of the secondary sealing cavity, which facilitates the detection of the internal air pressure of the secondary sealing cavity.

[0025] When the combustible gas concentration detected by one of the combustible gas concentration sensors 9 in the secondary sealed cavity reaches the blowing value, the first solenoid valve 12 opens to inject nitrogen into the secondary sealed cavity. At the same time, the safety valve 13 opens and the gas containing combustible gas is discharged to the outside through the oil and gas discharge main pipe of the storage tank via the vent pipe 16 for recycling. When the combustible gas concentration in the secondary sealed cavity reaches the safe value, the safety valve 13 automatically closes.

[0026] Specifically, when the rate of change of combustible gas value detected by combustible gas concentration sensor 9 reaches a set value, the first solenoid valve 12 opens to inject nitrogen into the secondary sealing chamber. At the same time, the safety valve 13 opens and the gas containing combustible gas is discharged to the outside through the oil and gas discharge main pipe of the storage tank for recycling via the vent pipe 16. When the combustible gas value in the secondary sealing chamber reaches a safe value, or when the gas pressure in the secondary sealing chamber reaches a set value, the first solenoid valve 12 closes, and the safety valve 13 automatically closes.

[0027] The gas pipeline 10 is equipped with a pressure regulating valve 7, and the pressure regulating valve 7 is connected to the controller.

[0028] The multiple combustible gas concentration sensors 9 are evenly distributed in the secondary sealed cavity, which has the advantage of high detection accuracy and avoids the inability to detect excessively high concentrations in a timely manner.

[0029] The gas venting pipe 16 is provided in multiple ways, and the gas venting ends of the multiple gas venting pipes 16 are connected by an annular gas supply pipe 17. The annular gas supply pipe 17 is provided with a discharge pipe extending from the top of the oil tank, which is beneficial for discharging the waste gas to the outside.

[0030] During operation, when the combustible gas concentration detected by one of the combustible gas concentration sensors 9 in the secondary sealed cavity reaches the blowing value, the first solenoid valve 12 opens to inject nitrogen into the secondary sealed cavity. At the same time, the safety valve 13 opens and the gas containing combustible gas is discharged to the outside through the oil and gas discharge main pipe of the storage tank via the vent pipe 16 for recycling. When the combustible gas concentration in the secondary sealed cavity reaches the safe value, the safety valve 13 automatically closes.

[0031] Specifically, when the rate of change of combustible gas value detected by combustible gas concentration sensor 9 reaches a set value, the first solenoid valve 12 opens to inject nitrogen into the secondary sealing chamber. At the same time, the safety valve 13 opens, and the gas containing combustible gas is discharged to the outside through the gas discharge main pipe of the storage tank via the vent pipe 16 for recycling. This process continues until the combustible gas value in the secondary sealing chamber reaches a safe value, or until the gas pressure in the secondary sealing chamber reaches a set value. Then, the first solenoid valve 12 closes, and the safety valve 13 automatically closes.

[0032] Alternatively, when the status sensor detects that the floating roof is moving up and down, the first solenoid valve 12 opens to inject nitrogen into the secondary sealing chamber, and at the same time the safety valve 13 opens to discharge the gas containing combustible gas to the outside for recycling through the oil and gas discharge main of the storage tank.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A nitrogen injection device for the secondary sealing chamber of an oil tank floating roof, characterized in that, The system includes a metal hose connector (2) mounted on a pressure plate (1), which is connected to a secondary sealing cavity consisting of a pressure plate (1), a floating roof (3), a tank body (4), and a sealing element (5). The outer end of the metal hose connector (2) is connected to a nitrogen injection pipe (6), and a first pressure gauge (8) is provided on the nitrogen injection pipe (6). The secondary sealing cavity is equipped with multiple combustible gas concentration sensors (9), and the outer end of the nitrogen injection pipe (6) is connected to a nitrogen tank (11) via a gas transmission pipe (10). A first solenoid valve (12) is provided on the gas transmission pipe (10). The pressure plate (1) is also provided with a vent pipe (16), and the vent pipe (16) is provided with a safety valve (13); the floating plate (3) is provided with a status sensor (18) for detecting the operating status of the floating plate (3). It also includes a controller, multiple combustible gas concentration sensors (9), a pressure regulating valve (7), a first solenoid valve (12), a safety valve (13), and a status sensor (18), all of which are connected to the controller.

2. The nitrogen injection device for the secondary sealing chamber of an oil tank floating roof according to claim 1, characterized in that, The pressure plate (1) is also provided with a second pressure gauge (15) for detecting the internal air pressure of the secondary sealing cavity.

3. The nitrogen injection device for the secondary sealing chamber of an oil tank floating roof according to claim 1, characterized in that, When the combustible gas concentration value detected by one of the combustible gas concentration sensors (9) in the secondary sealed cavity reaches the blowing value, the first solenoid valve (12) opens and injects nitrogen into the secondary sealed cavity. At the same time, the safety valve (13) opens and uses the vent pipe (16) to discharge the gas containing combustible gas to the outside for recycling through the oil and gas discharge main pipe of the storage tank. When the combustible gas value in the secondary sealed cavity reaches the safety value, the safety valve (13) automatically closes.

4. The nitrogen injection device for the secondary sealing chamber of an oil tank floating roof according to claim 2, characterized in that, When the rate of change of combustible gas value detected by combustible gas concentration sensor (9) reaches the set value, the first solenoid valve (12) opens and injects nitrogen into the secondary sealing chamber. At the same time, the safety valve (13) opens and uses the vent pipe (16) to discharge the gas containing combustible gas to the outside for recycling through the oil and gas discharge main pipe of the storage tank until the combustible gas value in the secondary sealing chamber reaches the safety value and the gas pressure in the secondary sealing chamber reaches the set value, the first solenoid valve (12) closes; and the safety valve (13) closes automatically.

5. The nitrogen injection device for the secondary sealing chamber of an oil tank floating roof according to claim 1, characterized in that, The gas pipeline (10) is equipped with a pressure regulating valve (7), and the pressure regulating valve (7) is connected to the controller.

6. The nitrogen injection device for the secondary sealing chamber of an oil tank floating roof according to claim 5, characterized in that, Multiple combustible gas concentration sensors (9) are evenly distributed in the secondary sealed cavity.

7. A nitrogen injection device for a secondary sealing chamber of a floating roof of an oil tank according to claim 5, characterized in that, The venting pipe (16) is provided in multiple ways, and the venting ends of the multiple venting pipes (16) are connected by an annular gas supply pipe (17), and the annular gas supply pipe (17) is provided with a discharge pipe extending from the top of the oil tank.

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