Pressure regulating and air supplementing device for shale oil storage tank

Abstract

The utility model provides a pressure regulating and gas supplementing device for a shale oil storage tank. The pressure regulating and gas supplementing device comprises a fuel gas pressure supplementing pipeline, a volatile gas pressure reducing pipeline and a station control system, the fuel gas pressure supplementing pipeline is arranged between the gas supplementing opening and the storage tank system and comprises a gas supplementing pipeline, and a first self-operated pressure regulating valve and a first control valve which are arranged on the gas supplementing pipeline; the volatile gas depressurization pipeline is arranged between the storage tank system and the exhaust port and comprises an exhaust pipeline, and a second self-operated pressure regulating valve and a second control valve which are arranged on the exhaust pipeline; the station control system is connected with the fuel gas pressure supplementing pipeline and used for monitoring the pressure in the storage tank system. When the pressure of the storage tank system is low, the first self-operated pressure regulating valve is opened, fuel gas is supplemented through the gas supplementing pipeline, when the pressure is high, the second self-operated pressure regulating valve is opened, the fuel gas is discharged through the exhaust pipeline, the pressure in the storage tank system is kept stable, and meanwhile air is prevented from being mixed into the storage tank to form explosive mixed gas. Safe and stable operation of the storage tank is ensured.

Description

Technical Field

[0001] This utility model relates to shale oil processing technology, specifically to a pressure regulating and gas replenishment device for shale oil storage tanks. Background Technology

[0002] The safe operation of shale oil storage tanks is crucial in the development, storage, and transportation of shale oil. After preliminary processing of the oil and gas well products at shale oil stations, the shale oil is transported and stored in tanks under normal pressure. Shale oil contains a certain amount of dissolved gas, which gradually evaporates with changes in temperature and pressure, causing the pressure in the storage tank to continuously increase. During loading, the liquid level in the tank drops, and the internal gas phase space gradually increases, disrupting the pressure balance inside and outside the tank, leading to a gradual decrease in pressure within the shale oil storage tank. This pressure imbalance not only affects the normal operation of the storage tank but may even threaten its structural safety.

[0003] Currently, to balance pressure changes within shale oil storage tanks, devices such as breather valves are typically used to draw in external gas for pressurization, or the shale oil storage tanks are connected to shale oil tank trucks to regulate air pressure. However, these methods have serious drawbacks. They easily draw in external air with a high oxygen concentration. This external air mixes with the gases volatilized inside the shale oil storage tank, forming a flammable and explosive mixture that could cause fires, explosions, and other accidents, posing significant safety hazards. Utility Model Content

[0004] To address the aforementioned deficiencies in existing technologies, a pressure regulating and gas replenishment device for shale oil storage tanks is provided. This device can automatically replenish fuel gas when the tank pressure is low and automatically discharge fuel gas when the pressure is high. This can prevent the formation of explosive gas mixtures in shale oil storage tanks, while maintaining pressure balance within the tanks and ensuring safe and stable operation.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A pressure regulating and gas replenishment device for shale oil storage tanks includes a fuel gas pressure replenishment pipeline, a volatile gas pressure reduction pipeline, and a station control system. The fuel gas pressure replenishment pipeline is located between the gas replenishment port and the storage tank system, and includes a gas replenishment pipe, a first self-regulating pressure regulating valve, and a first control valve installed on the gas replenishment pipe. The volatile gas pressure reduction pipeline is located between the storage tank system and the exhaust port, and includes an exhaust pipe, a second self-regulating pressure regulating valve, and a second control valve installed on the exhaust pipe. The station control system is connected to the fuel gas pressure replenishment pipeline and is used to monitor the pressure within the storage tank system.

[0007] According to the above technical solution, the first control valve includes a first valve and a second valve. The first valve is connected to the air supply port, the second valve is connected to the storage tank system, the first end and the second end of the first self-regulating pressure regulating valve are respectively connected to the first valve and the second valve, and the third end is connected to the air supply pipeline between the first self-regulating pressure regulating valve and the second valve through a pipeline.

[0008] According to the above technical solution, the fuel gas pressurization pipeline is also equipped with a self-operated shut-off valve.

[0009] According to the above technical solution, a pressure gauge is externally connected to the air supply pipeline between the first self-regulating pressure regulating valve and the second valve.

[0010] According to the above technical solution, a reserved pipe is connected to the air supply pipe between the second valve and the storage tank system, and the reserved pipe is sealed by a blind flange.

[0011] According to the above technical solution, a sixth valve is connected to the air supply pipeline between the first valve and the second valve.

[0012] According to the above technical solution, the second control valve includes a third valve and a fourth valve. The third valve is connected to the storage tank system, and the fourth valve is connected to the exhaust port. The first end and the second end of the second self-regulating pressure regulating valve are respectively connected to the third valve and the fourth valve, and the third end is connected to the exhaust pipe between the second self-regulating pressure regulating valve and the third valve through a pipe.

[0013] According to the above technical solution, an overpressure relief pipeline is also provided between the storage tank system and the exhaust port. The overpressure relief pipeline is connected in parallel with the volatile gas depressurization pipeline. The overpressure relief pipeline includes a relief pipe, and an overpressure safety relief valve and an on / off valve are provided on the relief pipe.

[0014] According to the above technical solution, the discharge pipeline is provided with a discharge bypass, which is connected in parallel outside the overpressure safety discharge valve and the on / off valve.

[0015] This utility model has the following beneficial effects:

[0016] 1. This utility model provides a pressure regulating and gas replenishment device for shale oil storage tanks. The device has a compact overall structure, is highly practical, and is easy to disassemble and transport. When the tank system pressure is low, the first self-regulating pressure regulating valve opens, replenishing fuel gas through the gas replenishment pipeline. When the pressure is high, the second self-regulating pressure regulating valve opens, discharging fuel gas through the exhaust pipeline, maintaining stable pressure within the tank system while preventing air from mixing into the tank and forming an explosive mixture, thus ensuring the safe operation of the tank.

[0017] 2. A self-operated shut-off valve has been added to the fuel gas repressurization pipeline. When the first self-operated pressure regulating valve fails and the continuous repressurization of fuel gas causes the pressure of the storage tank system to be too high, the self-operated shut-off valve can cut off the repressurization process in time.

[0018] 3. The overpressure relief pipeline of this device includes two venting channels. When the overpressure safety relief valve fails, venting can also be achieved through the venting bypass and the ninth valve to ensure that the storage tank can release venting in time when it is overpressured and restore pressure stability.

[0019] 4. This device has a reserved pipeline connected to the gas supply pipeline in the pressure regulating and gas supply device. When expanding the shale oil storage tank system in the future, the blind flange can be opened to connect directly, which is not only convenient and quick, but also avoids the safety risks caused by hot work. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a pressure regulating and gas replenishment device for a shale oil storage tank, provided as an embodiment of the present invention.

[0022] In the diagram: 1. Storage tank system; 2. Air inlet; 3. Exhaust outlet; 4. First valve; 5. Self-operated shut-off valve; 6. First self-operated pressure regulating valve; 7. Second valve; 8. Pressure gauge; 9. Third valve; 10. Fourth valve; 11. Blind flange; 12. Fifth valve; 13. Second self-operated pressure regulating valve; 14. Sixth valve; 15. Seventh valve; 16. Overpressure safety relief valve; 17. Eighth valve; 18. Ninth valve; 100. Air inlet pipeline; 200. Reserved pipeline; 300. Exhaust pipeline; 400. Relief pipeline; 500. Relief bypass. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] like Figure 1 As shown, this utility model provides a pressure regulating and gas replenishment device for shale oil storage tanks.

[0025] Example 1

[0026] It includes a fuel gas pressurization pipeline, a volatile gas depressurization pipeline, and a station control system; the fuel gas pressurization pipeline is located between the gas inlet 2 and the storage tank system 1, and includes a gas inlet pipe 100, and a first self-regulating pressure regulating valve 6 and a first control valve installed on the gas inlet pipe 100; the volatile gas depressurization pipeline is located between the storage tank system 1 and the exhaust port 3, and includes an exhaust pipe 300, and a second self-regulating pressure regulating valve 13 and a second control valve installed on the exhaust pipe 300; the station control system is connected to the fuel gas pressurization pipeline and is used to monitor the pressure in the storage tank system 1.

[0027] In this embodiment, when the pressure of storage tank system 1 is below 10 kPa, the first self-regulating pressure regulating valve 6 opens, and fuel gas from the station replenishes the pressure of storage tank system 1 through the gas replenishment pipeline 100. Once the pressure of storage tank system 1 recovers to above 10 kPa, the first self-regulating pressure regulating valve 6 closes, completing the gas replenishment process. When the pressure of storage tank system 1 exceeds 20 kPa, the second self-regulating pressure regulating valve 13 opens, and fuel gas in storage tank system 1 is transported to exhaust port 3 through exhaust pipeline 300 to reduce pressure. Once the pressure of storage tank system 1 recovers to below 20 kPa, the second self-regulating pressure regulating valve 13 closes, completing the exhaust process. The fuel gas replenishment pipeline and the volatile gas depressurization pipeline work together to ensure stable operation of storage tank system 1 under a slightly positive pressure of 10 kPa-20 kPa.

[0028] Example 2

[0029] The structure and principle of Example 2 are basically the same as those of Example 1, except that a preferred structural form of the first control valve and the second control valve is given.

[0030] In this embodiment, the first control valve includes a first valve 4 and a second valve 7. The first valve 4 is connected to the air supply port 2, and the second valve 7 is connected to the storage tank system 1. The first end and the second end of the first self-regulating pressure regulating valve 6 are respectively connected to the first valve 4 and the second valve 7, and the third end is connected to the air supply pipeline 100 between the first self-regulating pressure regulating valve 6 and the second valve 7 through a pipeline.

[0031] The second control valve includes a third valve 9 and a fourth valve 10. The third valve 9 is connected to the storage tank system 1, and the fourth valve 10 is connected to the exhaust port 3. The first end and the second end of the second self-regulating pressure regulating valve 13 are connected to the third valve 9 and the fourth valve 10 respectively, and the third end is connected to the exhaust pipe 300 between the second self-regulating pressure regulating valve 13 and the third valve 9 through a pipe.

[0032] Example 3

[0033] The structure and principle of Example 3 are basically the same as those of Example 2, except that: in order to improve safety, a self-operated shut-off valve 5 and a pressure gauge 8 are also provided on the fuel gas pressurization pipeline.

[0034] In this embodiment, a self-operated shut-off valve 5 is located between the first valve 4 and the first self-operated pressure regulating valve 6. The first and second ends of the self-operated shut-off valve 5 are connected to the first valve 4 and the first self-operated pressure regulating valve 6, respectively, and the third end is connected to the air supply pipe 100 between the first self-operated pressure regulating valve 6 and the second valve 7 via a pipeline. A pressure gauge 8 is located on the air supply pipe 100 between the first self-operated pressure regulating valve 6 and the second valve 7, and a fifth valve 12 is provided between the pressure gauge 8 and the air supply pipe 100.

[0035] In this embodiment, the station control system is electrically connected to the self-operated shut-off valve 5 and the pressure gauge 8, enabling remote reading of the valve position status of the self-operated shut-off valve 5 and the pressure data of the pressure gauge 8. If the first self-operated pressure regulating valve 6 malfunctions and cannot regulate the pressure normally, causing the storage tank system 1 to continuously replenish gas, when the pressure exceeds 30 kPa, the self-operated shut-off valve 5 closes, cutting off the gas replenishment process and issuing an alarm. After receiving the alarm, the station control system can remind personnel to go to the site for inspection in a timely manner.

[0036] Example 4

[0037] The structure and principle of Example 4 are basically the same as those of Example 3, except that: to facilitate the maintenance of the fuel gas repressurization pipeline, a sixth valve 14 is externally connected to the repressurization pipeline 100 between the first valve 4 and the second valve 7. The sixth valve 14 is specifically located between the first valve 4 and the self-operated shut-off valve 5. After closing the first valve 4 and the second valve 7, opening the sixth valve 14 to release pressure allows for maintenance.

[0038] Example 5

[0039] The structure and principle of Example 5 are basically the same as those of Example 1, except that: in order to expand the shale oil storage tank system 1, a reserved pipe 200 is connected to the gas supply pipe 100, and the reserved pipe 200 is sealed by a blind flange 11. Later, the expansion can be completed by directly connecting the blind flange 11 to the storage tank system 1, which is not only convenient and quick, but also avoids the safety risks caused by hot work.

[0040] Example 6

[0041] The structure and principle of Example 6 are basically the same as those of Example 1, except that:

[0042] In this embodiment, an overpressure relief pipeline is also provided between the storage tank system 1 and the exhaust port 3. The overpressure relief pipeline is connected in parallel with the volatile gas depressurization pipeline, and the two ends of the overpressure relief pipeline are connected to the storage tank system 1 and the exhaust port 3, respectively. The relief pipeline includes a relief pipe 400, on which an overpressure safety relief valve 16 and on / off valves are provided. The on / off valves include a seventh valve 15 and an eighth valve 17, which are respectively located upstream and downstream of the overpressure safety relief valve 16. If the volatile gas depressurization pipeline malfunctions, or if the volatile gas in the shale oil storage tank system 1 volatilizes more rapidly, causing abnormally high pressure in the storage tank system 1, when the pressure exceeds 35 kPa, the gas flow is automatically cut off and an alarm is issued. The overpressure safety relief valve 16 opens to accelerate the discharge of fuel gas and ensure that the storage tank system 1 returns to the normal pressure level as soon as possible.

[0043] Example 7

[0044] The structure and principle of Example 7 are basically the same as those of Example 6, except that: a relief bypass 500 is also provided on the relief pipe 400. The two ends of the relief bypass 500 are connected to the relief pipe 400 upstream of the seventh valve 15 and downstream of the eighth valve 17, respectively. A ninth valve 18 is provided on the relief bypass 500. When an abnormal high-pressure alarm occurs in the storage tank system 1, personnel rush to the site for inspection and can manually open the ninth valve 18 to further accelerate pressure relief and prevent accidents. The relief bypass 500 can also serve as a backup for the relief pipe 400, assisting in depressurizing the storage tank system 1 in the event of a failure of the overpressure relief valve.

[0045] The pressure regulating and gas replenishment device ensures stable operation of storage tank system 1 under a slightly positive pressure of 10Kpa-20Kpa. Its specific working principle is as follows: When the pressure of storage tank system 1 is below 10Kpa, fuel gas is replenished through the first self-regulating pressure regulating valve 6. When the pressure of storage tank system 1 exceeds 20Kpa, fuel gas is discharged through the second self-regulating pressure regulating valve 13, ensuring stable operation of storage tank system 1. When abnormally high pressure occurs in storage tank system 1, with the internal pressure exceeding 35Kpa, the second self-regulating pressure regulating valve 13 and the overpressure relief valve open simultaneously to discharge fuel gas. Alternatively, the ninth valve 18 can be manually opened, allowing for simultaneous venting through multiple channels, thereby quickly reducing the pressure of storage tank system 1 and restoring it to a slightly positive pressure state.

[0046] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A pressure regulating and gas replenishment device for shale oil storage tanks, characterized in that: This includes fuel gas pressurization pipelines, volatile gas depressurization pipelines, and station control systems; The fuel gas pressurization pipeline is located between the gas inlet and the storage tank system, and includes a gas inlet pipe, a first self-regulating pressure regulating valve and a first control valve located on the gas inlet pipe; The volatile gas pressure reduction pipeline is located between the storage tank system and the exhaust port, and includes an exhaust pipe and a second self-regulating pressure regulating valve and a second control valve installed on the exhaust pipe; The station control system is connected to the fuel gas pressurization pipeline and is used to monitor the pressure inside the storage tank system.

2. The pressure regulating and gas replenishment device for shale oil storage tanks according to claim 1, characterized in that: The first control valve includes a first valve and a second valve. The first valve is connected to the air supply port, and the second valve is connected to the storage tank system. The first end and the second end of the first self-regulating pressure regulating valve are respectively connected to the first valve and the second valve, and the third end is connected to the air supply pipeline between the first self-regulating pressure regulating valve and the second valve through a pipeline.

3. A pressure regulating and gas replenishment device for shale oil storage tanks according to claim 1 or 2, characterized in that: The fuel gas pressurization pipeline is also equipped with a self-operated shut-off valve.

4. A pressure regulating and gas replenishment device for shale oil storage tanks according to claim 2, characterized in that: A pressure gauge is connected to the air supply pipe between the first self-regulating pressure regulating valve and the second valve.

5. A pressure regulating and gas replenishment device for shale oil storage tanks according to claim 2, characterized in that: A reserved pipe is connected to the air supply pipe between the second valve and the storage tank system, and the reserved pipe is sealed by a blind flange.

6. A pressure regulating and gas replenishment device for shale oil storage tanks according to claim 2, characterized in that: A sixth valve is connected to the air supply pipe between the first valve and the second valve.

7. A pressure regulating and gas replenishment device for shale oil storage tanks according to claim 1, characterized in that: The second control valve includes a third valve and a fourth valve. The third valve is connected to the storage tank system, and the fourth valve is connected to the exhaust port. The first and second ends of the second self-regulating pressure regulating valve are respectively connected to the third valve and the fourth valve, and the third end is connected to the exhaust pipe between the second self-regulating pressure regulating valve and the third valve through a pipeline.

8. A pressure regulating and gas replenishment device for shale oil storage tanks according to claim 1, characterized in that: An overpressure relief pipeline is also provided between the storage tank system and the exhaust port. The overpressure relief pipeline is connected in parallel with the volatile gas depressurization pipeline. The overpressure relief pipeline includes a relief pipe, and the relief pipe is equipped with an overpressure safety relief valve and an on / off valve.

9. A pressure regulating and gas replenishment device for shale oil storage tanks according to claim 8, characterized in that: The discharge pipeline is equipped with a discharge bypass, which is connected in parallel to the overpressure safety discharge valve and the on / off valve.

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