Pipeline oil and gas pressure relief device

Abstract

The utility model discloses a pipeline oil steam pressure relief device which comprises a tank body, the interior of the tank body is divided into two independent cavities, namely a condensation cavity and an oil steam buffering cavity, by a partition plate, the condensation cavity and the oil steam buffering cavity are arranged from top to bottom, and the condensation cavity and the oil steam buffering cavity are communicated through a pressure relief pipe and a backflow pipe respectively. The pressure relief pipe and the return pipe are provided with a pressure relief valve and a return valve respectively, a device inlet pipe communicated with the interior of the oil-gas buffer cavity is arranged on the outer side of the tank body, a pressure monitoring assembly is arranged on the device inlet pipe, an emptying pipe is arranged at the position, close to the top, of the outer side of the condensation cavity, and an emptying valve is arranged on the emptying pipe. A liquid level monitoring assembly is arranged on the outer side of the condensation cavity. The oil depot pressure relief device can effectively relieve pressure and ensure the safety of an oil depot.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas storage and transportation safety technology, and specifically relates to a pipeline oil and gas pressure relief device. Background Technology

[0002] Some pipelines in oil depots are located above ground. During the summer, when temperatures are high, the liquid oil inside these pipelines vaporizes into oil vapor, causing pressure increases and posing a safety hazard. Many oil depots have tried installing degassing devices to relieve pressure, but these methods are ineffective in reducing pipeline pressure and the released oil vapor pollutes the environment. Therefore, from both a safety and environmental perspective, there is an urgent need for a safe and environmentally friendly pressure relief device suitable for oil depot pipelines to solve these problems. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a pipeline oil and gas pressure relief device that can effectively relieve pressure and ensure the safety of oil depots, addressing the shortcomings of the prior art.

[0004] The technical solution adopted by this utility model is: a pipeline oil vapor pressure relief device, including a tank body, the tank body being divided into two independent cavities, a condensation cavity and an oil vapor buffer cavity, by a partition plate, the condensation cavity and the oil vapor buffer cavity being arranged from top to bottom, the condensation cavity and the oil vapor buffer cavity being connected by a pressure relief pipe and a return pipe respectively, the pressure relief pipe and the return pipe being respectively equipped with a pressure relief valve and a return valve, the outside of the tank body being provided with a device inlet pipe communicating with the inside of the oil vapor buffer cavity, the device inlet pipe being equipped with a pressure monitoring component, the outside of the condensation cavity being provided with an vent pipe near the top, the vent pipe being equipped with an vent valve, and the outside of the condensation cavity being provided with a liquid level monitoring component.

[0005] In one embodiment, the pressure relief valve, the return valve, and the vent valve are all control valves.

[0006] In one embodiment, the pressure monitoring component includes a pressure gauge and a pressure transmitter.

[0007] In one embodiment, the level monitoring component includes a level gauge and a level transmitter.

[0008] In one embodiment, a PLC is also included, and the pressure relief valve, reflux valve, vent valve, pressure transmitter, and level transmitter are all connected to the PLC.

[0009] In one embodiment, the pressure relief valve, the return valve, and the vent valve are all manual valves.

[0010] In one embodiment, the pressure monitoring component includes a pressure gauge.

[0011] In one embodiment, the level monitoring component includes a level gauge.

[0012] In one embodiment, the pressure relief pipe is equipped with an automatic venting valve.

[0013] In one embodiment, a drain pipe is provided at the bottom of the oil-vapor buffer chamber, and a drain valve is provided on the drain pipe.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. Real-time monitoring of parameters such as pipeline pressure and liquid level within the device using pressure and level measuring instruments;

[0016] 2. Using the monitored pressure and liquid level data, manually or automatically control each valve to keep the pipeline pressure within a safe range;

[0017] 3. Through a specially designed structure, the emitted oil vapor is condensed and collected, and recycled back into the pipeline under appropriate conditions, preventing the emission of oil vapor into the atmosphere. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0019] Figure 2 for Figure 1 Diagram showing direction A in the middle;

[0020] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0021] Figure 4 for Figure 3 Diagram showing direction A.

[0022] In the diagram: 1. Tank; 2. Pressure relief pipe; 3. Return pipe; 4. Pressure relief valve; 5. Return valve; 6. Device inlet pipe; 7. Drain pipe; 8. Drain valve; 9. Pressure gauge; 10. Pressure transmitter; 11. Level gauge; 12. Level transmitter; 13. PLC; 14. Automatic exhaust valve; 15. Drain pipe; 16. Drain valve; 101. Baffle plate; 102. Condensation chamber; 103. Oil-vapor buffer chamber. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Example 1:

[0025] like Figure 1 and Figure 2As shown, this utility model discloses a pipeline oil vapor pressure relief device, including a tank body 1. The tank body 1 is divided into two independent cavities, a condensation cavity 102 and an oil vapor buffer cavity 103, by a partition 101. The condensation cavity 102 and the oil vapor buffer cavity 103 are arranged from top to bottom and are connected to each other by a pressure relief pipe 2 and a return pipe 3, respectively. The pressure relief pipe 2 and the return pipe 3 are respectively equipped with a pressure relief valve 4 and a return valve 5. A device inlet pipe 6 communicating with the inside of the oil vapor buffer cavity 103 is provided on the outside of the tank body 1. A pressure monitoring component is provided on the device inlet pipe 6. An vent pipe 7 is provided near the top on the outside of the condensation cavity 102. A vent valve 8 is provided on the vent pipe 7. A liquid level monitoring component is provided on the outside of the condensation cavity 102.

[0026] In this embodiment, the pressure relief valve 4, the return valve 5, and the vent valve 8 are all control valves.

[0027] In this embodiment, the pressure monitoring component includes a pressure gauge 9 and a pressure transmitter 10.

[0028] In this embodiment, the liquid level monitoring component includes a liquid level gauge 11 and a liquid level transmitter 12.

[0029] In this embodiment, a PLC13 is also included, and the pressure relief valve 4, the return valve 5, the vent valve 8, the pressure transmitter 10, and the level transmitter 12 are all connected to the PLC13.

[0030] In this embodiment, a drain pipe 15 is provided at the bottom of the oil-gas buffer chamber 103, and a drain valve 16 is provided on the drain pipe 15.

[0031] This embodiment is an automatic control mode, and the specific workflow is as follows:

[0032] Pressure relief valve 4 and return valve 5 are both normally closed solenoid valves, meaning they close when power is off and open when power is on. Drain valve 8 is a normally open solenoid valve, meaning it opens when power is off and closes when power is on. The device inlet pipe 6 connects to the pipeline. Pressure transmitter 10 monitors the pipeline pressure in real time. When the pressure exceeds the set value, PLC 13 controls the opening of pressure relief valve 4. At this time, oil vapor in the oil-vapor buffer chamber 103 quickly enters the condensing chamber 102 tangentially through pressure relief valve 4. Due to pressure difference, flow rate, and other factors, the oil vapor rapidly condenses into liquid in the condensing chamber 102. Level transmitter 12 monitors the liquid level in the condensing chamber 102 in real time. When the liquid level reaches the set value, PLC 13 controls the closing of drain valve 8 and the opening of pressure relief valve 4 and return valve 5. At this time, the liquid in the condensing chamber 102 flows back to the oil-vapor buffer chamber 103 through return pipe 3. Pressure gauge 9 ensures that pressure transmitter 10 is in normal working condition, and level gauge 11 ensures that level transmitter 12 is in normal working condition.

[0033] Example 2:

[0034] like Figure 3 and Figure 4 As shown, this utility model discloses a pipeline oil vapor pressure relief device, including a tank body 1. The tank body 1 is divided into two independent cavities, a condensation cavity 102 and an oil vapor buffer cavity 103, by a partition 101. The condensation cavity 102 and the oil vapor buffer cavity 103 are arranged from top to bottom and are connected to each other by a pressure relief pipe 2 and a return pipe 3, respectively. The pressure relief pipe 2 and the return pipe 3 are respectively equipped with a pressure relief valve 4 and a return valve 5. A device inlet pipe 6 communicating with the inside of the oil vapor buffer cavity 103 is provided on the outside of the tank body 1. A pressure monitoring component is provided on the device inlet pipe 6. An vent pipe 7 is provided near the top on the outside of the condensation cavity 102. A vent valve 8 is provided on the vent pipe 7. A liquid level monitoring component is provided on the outside of the condensation cavity 102.

[0035] In this embodiment, the pressure relief valve 4, the return valve 5, and the vent valve 8 are all manual valves.

[0036] In this embodiment, the pressure monitoring component includes a pressure gauge 9.

[0037] In this embodiment, the liquid level monitoring component includes a liquid level gauge 11.

[0038] In this embodiment, the pressure relief pipe 2 is equipped with an automatic air release valve 14.

[0039] In this embodiment, a drain pipe 15 is provided at the bottom of the oil-gas buffer chamber 103, and a drain valve 16 is provided on the drain pipe 15.

[0040] This embodiment is a manual control mode, and the specific workflow is as follows:

[0041] Pressure relief valve 4 and vent valve 8 are in the open position, while return valve 5 is in the closed position. When liquid oil vaporizes, it collects in the oil-vapor buffer chamber 103. When a certain pressure is reached, the oil vapor is discharged into the condensing chamber 102 through the automatic vent valve 14. Due to factors such as pressure difference and flow rate, the oil vapor quickly condenses into liquid in the condensing chamber 102. The liquid level in the condensing chamber 102 is observed through the level gauge 11. When the liquid level reaches a certain value, the vent valve 8 is closed and the return valve 5 is opened to return the liquid in the condensing chamber 102 to the oil-vapor buffer chamber 103. After the liquid level drops to a certain value, the return valve 5 is closed first, and then the vent valve 8 is opened to restore the original process.

[0042] The principle of this device is as follows:

[0043] 1. Pressure relief principle:

[0044] It mainly utilizes monitored pressure data and uses a program algorithm to control the on / off state of each solenoid valve with a PLC13 to achieve pipeline pressure relief.

[0045] 2. Condensation principle:

[0046] During depressurization, the oil vapor pressure decreases in a very short time, leaving insufficient time for heat exchange with the surroundings. This entire process corresponds to adiabatic expansion in thermodynamics, according to the first law of thermodynamics and the adiabatic equation for an ideal gas:

[0047]

[0048] When oil vapor enters the condenser from the oil vapor buffer tank, the oil vapor pressure drops rapidly, causing the gas volume to increase and the temperature to drop rapidly, condensing into liquid. The liquid then enters the condenser tangentially and eventually collects inside the condenser under the action of centrifugal force.

[0049] This device can condense and recover the oil vapor discharged during pressure relief, which not only reduces emissions and environmental pollution, but also recovers it into the pipeline, reducing losses. Automatic or manual control can be selected according to the actual site conditions and needs. The device is installed below the loading arm of the loading and unloading platform, at the highest point of the pipeline, which is the concentrated area of ​​oil vapor, ensuring effective pressure relief.

[0050] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A pipeline oil and gas pressure relief device, characterized in that: The tank (1) is divided into two independent chambers, a condensation chamber (102) and an oil vapor buffer chamber (103), by a partition (101). The condensation chamber (102) and the oil vapor buffer chamber (103) are arranged from top to bottom. The condensation chamber (102) and the oil vapor buffer chamber (103) are connected by a pressure relief pipe (2) and a return pipe (3), respectively. The pressure relief pipe (2) and the return pipe (3) are respectively equipped with a pressure relief valve (4) and a return valve (5). The outside of the tank (1) is equipped with a device inlet pipe (6) that communicates with the inside of the oil vapor buffer chamber (103). The device inlet pipe (6) is equipped with a pressure monitoring component. The outside of the condensation chamber (102) is equipped with an vent pipe (7) near the top. The vent pipe (7) is equipped with a vent valve (8). The outside of the condensation chamber (102) is equipped with a liquid level monitoring component.

2. The pipeline oil and gas pressure relief device according to claim 1, characterized in that: The pressure relief valve (4), return valve (5), and vent valve (8) are all control valves.

3. The pipeline oil and gas pressure relief device according to claim 2, characterized in that: The pressure monitoring component includes a pressure gauge (9) and a pressure transmitter (10).

4. A pipeline oil and gas pressure relief device according to claim 3, characterized in that: The liquid level monitoring component includes a liquid level gauge (11) and a liquid level transmitter (12).

5. A pipeline oil and gas pressure relief device according to claim 4, characterized in that: It also includes a PLC (13), and the pressure relief valve (4), return valve (5), vent valve (8), pressure transmitter (10) and level transmitter (12) are all connected to the PLC (13).

6. A pipeline oil and gas pressure relief device according to claim 1, characterized in that: The pressure relief valve (4), return valve (5), and vent valve (8) are all manual valves.

7. A pipeline oil and gas pressure relief device according to claim 6, characterized in that: The pressure monitoring component includes a pressure gauge (9).

8. A pipeline oil and gas pressure relief device according to claim 7, characterized in that: The liquid level monitoring component includes a liquid level gauge (11).

9. A pipeline oil and gas pressure relief device according to claim 8, characterized in that: An automatic air vent valve (14) is provided on the pressure relief pipe (2).

10. A pipeline oil and gas pressure relief device according to claim 5 or 9, characterized in that: The bottom of the oil-gas buffer chamber (103) is provided with a drain pipe (15), and a drain valve (16) is provided on the drain pipe (15).

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