An efficient waste oil recovery system

Abstract

The present invention provides an efficient waste oil recovery system, belonging to the field of marine petroleum engineering technology, comprising a magnetic flap level gauge, an oil collection pipeline, and a regulating valve group. The lower end of the magnetic flap level gauge is connected to the oil collection pipeline via a docking flange, and the downstream end of the oil collection pipeline is connected to the regulating valve group via a plug-in welding method. The present invention can achieve two functions: one is waste oil recovery, and the other is liquid level gauge discharge operation. The present invention can optimize the oil collection process, enhance the sewage treatment effect, improve the injection water quality, and reduce the operating load of downstream treatment facilities and pumps. At the same time, the present invention is also safe and efficient, and can realize the direct discharge of the liquid level gauge into a closed drain, effectively avoiding the risk of harm to the human body caused by open discharge.

Description

Technical Field

[0001] The invention belongs to the technical field of marine petroleum engineering, and in particular relates to a high-efficiency waste oil recovery system. Background Art

[0002] In existing wastewater treatment processes, waste oil is collected in an oil chamber and then discharged into a closed drain or oil collection tank in real time through liquid level adjustment. Existing level gauge discharge technology is open-type. The specific process involves isolating the upper and lower connecting valves of the level gauge, placing a waste liquid bucket at the bottom of the level gauge, and slowly opening the drain valve at the bottom of the level gauge to remove and drain the waste oil and other impurities inside the level gauge.

[0003] During actual on-site operation, it was discovered that the oil collection effect in the oil chamber was not ideal, often with incomplete topside oil collection. Over time, this accumulated and increased the amount of oil, resulting in substandard water quality at the outlet. Existing wastewater treatment systems all feature an oil collection chamber, which is controlled by adjusting the mixing chamber liquid level. However, during the actual collection process, liquid continuously flows into the chamber. Sampling at the chamber outlet revealed that the chamber is mostly water. Due to the density of oil and water, the oil only floats above the chamber, while the lower portion is mostly water. If the upper portion of the oil is fully recovered, the upper portion can only be recovered after the lower portion of the wastewater is completely drained. This oil collection method results in a significant influx of water into downstream treatment equipment, increasing the transfer burden on pumps and other equipment. Furthermore, freely separated oil gradually accumulates at the top of the chamber. As the accumulated oil increases, it cannot be discharged in a timely manner, reducing the water quality at the outlet. In addition, the high viscosity of dirty oil can cause the magnetic float level gauge in the oil chamber to become stuck. When this happens, the level gauge needs to be depressurized or cleaned to resolve the problem. Currently, the level gauge's discharge technology is open, and the specific process is as follows: the upper and lower connecting valves of the level gauge are isolated, a waste liquid bucket is placed at the bottom of the level gauge, and the vent valve at the bottom of the level gauge is slowly opened to remove and drain the dirty oil and other impurities in the level gauge. During pressure relief or sewage cleaning of the level gauge, some liquids or gases that may contain harmful substances are directly discharged into the waste liquid collection bucket. At the same time, due to the possibility of residual pressure in the level gauge, liquid splashing is very likely to occur during discharge or flushing. That is, the discharged medium is directly in contact with the atmospheric environment and exposed to the atmospheric environment. Therefore, if the protective measures are not perfect, the operator is very likely to be exposed to these toxic and harmful substances, causing damage to their health. Summary of the Invention

[0004] In view of this, the present invention aims to propose an efficient waste oil recovery system, which can not only improve the oil recovery efficiency and improve the water quality of sewage treatment, but also reduce the operating load of downstream pumps or treatment facilities, reduce the labor intensity of on-site operators in discharging liquid level gauges, and avoid direct contact of the discharged medium with the atmospheric environment.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is implemented as follows: an efficient waste oil recovery system, including a magnetic flap level gauge, an oil collection pipeline and a regulating valve group, the lower end of the magnetic flap level gauge is connected to the oil collection pipeline through a docking flange, and the downstream of the oil collection pipeline is connected to the regulating valve group by plug welding.

[0006] Furthermore, an upper drainage pipe and a lower drainage pipe are connected to the main body of the magnetic flap level gauge, and one end of the upper drainage pipe and the lower drainage pipe away from the magnetic flap level gauge are respectively installed on the oil chamber of the sewage treatment system. After the upper drainage pipe and the lower drainage pipe are respectively connected to the magnetic flap level gauge and the oil chamber, the oil chamber liquid level is converted into potential energy through the U-shaped tube connection, which is displayed by the magnetic flap level gauge.

[0007] Furthermore, an upper drainage pipe ball valve is installed on the upper drainage pipe, and a lower drainage pipe ball valve is installed on the lower drainage pipe. Both the upper drainage pipe ball valve and the lower drainage pipe ball valve are corrosion-resistant and high-temperature resistant ball valves.

[0008] Furthermore, a liquid level transmitter is installed above the magnetic flap level gauge. One end of the liquid level transmitter is connected to the magnetic flap level gauge through a pressure pipeline, and the other end is connected to the liquid level control valve in the control valve group through a pressure pipeline. At the same time, the liquid level transmitter is electrically connected to the remote central control and is used to monitor the liquid level of the oil chamber. It can convert the actual liquid level data on site into an electrical signal and transmit it to the remote central control. The on-site numerical value is compared with the central control set value, and the remote central control controls the opening or opening and closing status of the liquid level control valve.

[0009] Furthermore, an exhaust valve is installed at the upper end of the magnetic flap level gauge. The exhaust valve is a ball valve, and a wire plug is installed at the end of the exhaust valve to provide a fluid channel when the magnetic flap level gauge is discharged or flushed.

[0010] Furthermore, the material of the oil receiving pipeline is corrosion-resistant and pressure-resistant carbon steel. The oil receiving pipeline is connected to the lower end of the magnetic flap level gauge through a docking flange, and the flange is bolted. A high-temperature and corrosion-resistant graphite wound gasket is installed at the docking flange.

[0011] Furthermore, the oil receiving pipeline is provided with multiple branch pipelines, namely a first branch pipeline, a second branch pipeline and a third branch pipeline, wherein one end of the first branch pipeline is connected to the oil chamber outlet, and the other end is connected to the main pipe of the oil receiving pipeline, and at the same time, a first ball valve is installed on the first branch pipeline, one end of the second branch pipeline is connected to the main pipe of the oil receiving pipeline, and the other end is provided with a reserved port, which provides a fluid channel for flushing operations or other operations of the magnetic flap level gauge, and the reserved port is installed with a quick connector, one end of the third branch pipeline is connected to the main pipe of the oil receiving pipeline, and the other end is provided with a low-point discharge device, which is used to observe the oil collection effect and as a drain point; a second ball valve is also installed on the main pipe of the oil receiving pipeline.

[0012] Furthermore, the regulating valve group includes a liquid level regulating valve, a ball valve before the regulating valve, a ball valve after the regulating valve and a regulating valve bypass. The regulating valve group includes two parallel pipelines, one of which is equipped with a ball valve before the regulating valve, a liquid level regulating valve and a ball valve after the regulating valve in sequence, and the other pipeline is equipped with a regulating valve bypass.

[0013] Furthermore, when the liquid level in the oil chamber rises to the set level, the liquid level transmitter transmits a signal to the liquid level regulating valve, controlling the opening or closing of the liquid level regulating valve to collect oil.

[0014] Compared with the prior art, the efficient waste oil recovery system of the present invention has the following advantages:

[0015] (1) The recovery system of the present invention collects oil from the top of the magnetic flap level gauge, i.e., discharges oil from the drainage pipe on the magnetic flap level gauge, which can effectively clean the dirty oil on the top of the oil chamber, completely solving the problem of incomplete oil collection, improving the oil collection efficiency, and thus optimizing the water quality;

[0016] (2) When the magnetic flap level gauge becomes stuck, it is only necessary to isolate the valves of the upper and lower drainage pipes and open the discharge process to achieve closed discharge, effectively avoiding direct contact between the discharge medium and the atmosphere, thus avoiding exposure to the atmosphere and causing damage to the health of the operator;

[0017] (3) The present invention has a simple structure, a high degree of automation, and can be manually intervened. It has a wide range of applications and strong promotion potential and can be applied to existing sewage treatment systems on offshore oil platforms.

[0018] (4) The present invention can optimize the oil recovery process, enhance the sewage treatment effect, and improve the injection water quality;

[0019] (5) The present invention effectively reduces the operating load of downstream processing facilities and equipment such as pumps;

[0020] (6) The present invention can realize the direct discharge of the liquid level gauge into the closed drain, which is safe and efficient, and effectively avoids the risk of harm to the human body caused by open discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall assembly of the efficient waste oil recovery system according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Magnetic flap level gauge; 2. Upper drainage pipe ball valve; 3. Lower drainage pipe ball valve; 4. Liquid level transmitter; 5. Reserved port; 6. Low-point discharge device; 7. First ball valve; 8. Second ball valve; 9. Liquid level regulating valve; 10. Exhaust valve; 11. Oil collection pipeline; 12. Ball valve before regulating valve; 13. Ball valve after regulating valve; 14. Regulating valve bypass. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] like Figure 1 As shown, the present invention is an efficient waste oil recovery system, including a magnetic flap level gauge 1, an oil collection pipeline 11 and a regulating valve group. The lower end of the magnetic flap level gauge 1 is connected to the oil collection pipeline 11 through a docking flange, and the downstream of the oil collection pipeline 11 is connected to the regulating valve group by plug welding. The recovery system can realize oil collection and level gauge discharge in the oil chamber of the existing sewage treatment system.

[0028] The main body of the magnetic flap level gauge 1 is connected to an upper drainage tube and a lower drainage tube. The ends of the upper drainage tube and the lower drainage tube away from the magnetic flap level gauge 1 are respectively installed on the oil chamber of the sewage treatment system. After the upper drainage tube and the lower drainage tube are connected to the magnetic flap level gauge 1 and the oil chamber respectively, the oil chamber liquid level is converted into potential energy through the U-shaped tube connection, and the value is displayed by the magnetic flap level gauge 1. The upper end of the magnetic flap level gauge 1 is installed with an exhaust valve 10. The exhaust valve 10 is a ball valve, and the end of the exhaust valve 10 is installed with a wire plug to prevent accidental contact by the operator and provide a fluid channel when the magnetic flap level gauge 1 is discharged or flushed.

[0029] An upper drainage pipe ball valve 2 is installed on the upper drainage pipe, and a lower drainage pipe ball valve 3 is installed on the lower drainage pipe. Both the upper drainage pipe ball valve 2 and the lower drainage pipe ball valve 3 are corrosion-resistant and high-temperature resistant ball valves.

[0030] A liquid level transmitter 4 is installed above the magnetic flap level gauge 1. One end of the liquid level transmitter 4 is connected to the magnetic flap level gauge 1 through a pressure pipeline, and the other end is connected to the liquid level control valve 9 in the control valve group through a pressure pipeline. At the same time, the liquid level transmitter 4 is electrically connected to the remote central control for monitoring the liquid level of the oil chamber. It can convert the actual liquid level data on site into an electrical signal and transmit it to the remote central control. The on-site value is compared with the central control PCS set value, and the remote central control PID controls the opening or opening and closing state of the liquid level control valve 9.

[0031] Taking into account that the medium of the sewage treatment system is high temperature and high pressure, and is rich in corrosive factors such as microorganisms, iron bacteria, dissolved oxygen, carbon dioxide, etc., the material of the oil receiving pipeline 11 is selected to be corrosion-resistant and pressure-resistant carbon steel. The oil receiving pipeline 11 is connected to the lower end of the magnetic flap level gauge 1 through a docking flange, and the flange is bolted. A high-temperature and corrosion-resistant graphite spiral wound gasket is installed at the docking flange, which can ensure the effective sealing of the facility and prevent leakage.

[0032] The oil receiving pipeline 11 is provided with a plurality of branch pipelines, namely a first branch pipeline, a second branch pipeline and a third branch pipeline, wherein one end of the first branch pipeline is connected to the oil chamber outlet, and the other end is connected to the main pipe of the oil receiving pipeline 11, and a first ball valve 7 is installed on the first branch pipeline; one end of the second branch pipeline is connected to the main pipe of the oil receiving pipeline 11, and the other end is provided with a reserved port 5, the reserved port 5 provides a fluid channel for the flushing operation or other operations of the magnetic flap level gauge 1, and the reserved port 5 is installed with a quick connector, which is mainly connected to the flushing pipeline. To prevent blockage of the magnetic flap level gauge 1 and the oil collection pipeline 11, a flushing line can be connected to clear any blockage. One end of the third branch pipeline is connected to the main pipe of the oil collection pipeline 11, and the other end is equipped with a low-point discharge device 6. This low-point discharge device 6 is used to observe the oil collection process and serves as a drain point. During the oil collection process, the low-point discharge device 6 allows for real-time observation of the oil collection process. Specifically, a valve is installed at the low-point discharge device 6, which allows operators to open the valve for real-time observation. A second ball valve 8 is also installed on the main pipe of the oil collection pipeline 11. The pressure rating, nominal diameter, and other parameters of the first and second ball valves 7 and 8 are matched to the oil collection pipeline 11, meeting the process requirements. During the oil collection process, the first ball valve 7 must remain open, while the second ball valve 8 must remain closed. If the oil chamber is not fully collected or the efficiency is low, the first ball valve 7 must be closed, while the second ball valve 8 must remain open to allow the level gauge to collect oil, thus enabling switching between the oil collection process and the level gauge collection process. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed to indicate or imply relative importance or implicitly specify the number of the technical features referred to. Thus, features defined as "first," "second," and the like may explicitly or implicitly include one or more of such features. In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can mean fixed, removable, or integral; mechanical or electrical; direct or indirect through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] The regulating valve group includes a liquid level regulating valve 9, a pre-regulating valve ball valve 12, a post-regulating valve ball valve 13, and a regulating valve bypass 14. The regulating valve group comprises two parallel pipelines, one of which is sequentially installed with the pre-regulating valve ball valve 12, the liquid level regulating valve 9, and the post-regulating valve ball valve 13, all connected by flange connections and bolted fastenings. The other pipeline is installed with the regulating valve bypass 14, i.e., the pre-regulating valve ball valve 12 is installed upstream of the hydraulic regulating valve, and the post-regulating valve ball valve 13 is installed downstream. When the liquid level regulating valve 9 fails or undergoes maintenance, the regulating valve bypass 14 can temporarily function as a regulating valve to ensure normal production. The liquid level regulating valve 9 is controlled by a liquid level transmitter 4. When the liquid level in the oil chamber rises to the set level, the liquid level transmitter 4 transmits a signal to the liquid level regulating valve 9, controlling the opening or closing of the liquid level regulating valve 9 to collect oil.

[0034] Taking an oilfield sewage system as an example, the operation method of the present invention is described as follows:

[0035] The oil collection operation method is to implement the oil collection operation in the oil chamber according to the actual operating conditions on site, the first ball valve 7 at the bottom of the oil chamber outlet is in a closed state, the second ball valve 8 is in an open state, the ball valve 12 before the regulating valve, the liquid level regulating valve 9, and the ball valve 13 after the regulating valve are all in an open state, the regulating valve bypass 14 is in a closed state, the reserved port 5 and the low point discharge device 6 are all in a closed state, the ball valve 3 of the lower drainage pipe of the magnetic flap level gauge 1 is in a closed state, and the ball valve 2 of the upper drainage pipe is in an open state, by raising the oil chamber liquid level (through Control the liquid level in the mixing chamber to raise the liquid level in the oil chamber), discharge the dirty oil from the drainage port on the magnetic flap level gauge 1, and control the oil collection flow through the liquid level regulating valve 9 (the central control sets the regulating valve status to manual and controls the flow according to the valve opening). During the oil collection process, pay attention to the rise of the closed discharge liquid level. At the same time, regularly observe whether the dirty oil in the oil chamber is completely recovered through the low-point discharge device 6 of the oil collection pipeline 11 until clear water is obtained; the closed discharge system is an original device in the oil field production facilities, which is specifically responsible for the pressure relief and discharge functions of various processing equipment.

[0036] The discharge operation method of the liquid level gauge is as follows: when it is necessary to discharge the level gauge, just close the upper drainage pipe ball valve 2 and the lower drainage pipe ball valve 3, keep the first ball valve 7 at the oil chamber outlet, the low point discharge device 6, the reserved port 5, and the regulating valve bypass 14 in a closed state, connect the oil collection pipeline 11, the second ball valve 8, the ball valve before the regulating valve 12, and the ball valve after the regulating valve 13 are all in an open state, and the liquid level regulating valve 9 is manually opened slowly. When the magnetic flap liquid level drops to a stable state, the liquid level no longer drops. Slowly open the exhaust valve 10 and the wire plug above the magnetic flap liquid level gauge 1 to balance the internal and external pressure difference of the magnetic flap liquid level gauge 1 and discharge the remaining dirty oil and other impurities. This process is fully enclosed, which effectively controls the environmental pollution that may be caused by liquid splashing and the harm to the health of the operator.

[0037] The pressure relief operation of the level gauge is consistent with the discharge operation of the level gauge; when the magnetic flap level gauge 1 is stuck and the displayed value is too high or too low, an error occurs, the level gauge needs to be pressure relieved and discharged.

[0038] The present invention can achieve two functions: one is the recovery of waste oil, and the other is the liquid level meter discharge operation. The present invention can optimize the oil collection procedure, enhance the sewage treatment effect, improve the injection water quality, and reduce the operating load of downstream treatment facilities and pumps and other equipment. At the same time, the present invention is also safe and efficient, and can realize the direct discharge of the liquid level meter into the closed drain, effectively avoiding the risk of harm to the human body caused by open discharge.

[0039] The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An efficient waste oil recovery system, characterized by: It comprises a magnetic flap level gauge (1), an oil receiving pipeline (11) and a regulating valve group, wherein the lower end of the magnetic flap level gauge (1) is connected to the oil receiving pipeline (11) via a docking flange, and the downstream of the oil receiving pipeline (11) is connected to the regulating valve group via a plug welding method; An upper drainage pipe and a lower drainage pipe are connected to the main body of the magnetic flap level gauge (1), and ends of the upper drainage pipe and the lower drainage pipe away from the magnetic flap level gauge (1) are respectively installed on the oil chamber of the sewage treatment system; A liquid level transmitter (4) is installed above the magnetic flap liquid level gauge (1), one end of the liquid level transmitter (4) is connected to the magnetic flap liquid level gauge (1) via a pressure-inducing pipeline, and the other end is connected to the liquid level regulating valve (9) in the regulating valve group via a pressure-inducing pipeline; The oil receiving pipeline (11) is provided with a plurality of branch pipelines, namely a first branch pipeline, a second branch pipeline and a third branch pipeline, wherein one end of the first branch pipeline is connected to the oil chamber outlet, and the other end is connected to the main pipe of the oil receiving pipeline (11), and a first ball valve (7) is installed on the first branch pipeline, one end of the second branch pipeline is connected to the main pipe of the oil receiving pipeline (11), and the other end is provided with a reserved port (5), the reserved port (5) provides a fluid channel for the flushing operation or other operations of the magnetic flap level gauge (1), and the reserved port (5) is installed with a quick connector, one end of the third branch pipeline is connected to the main pipe of the oil receiving pipeline (11), and the other end is provided with a low-point discharge device (6), the low-point discharge device (6) is used to observe the oil collection effect and serve as an emptying point; the main pipe of the oil receiving pipeline (11) is also provided with a second ball valve (8); When the oil chamber oil collection operation is carried out, the dirty oil is discharged from the upper drainage port of the magnetic flap level gauge (1), and the oil collection flow rate is controlled by the liquid level regulating valve (9).

2. The efficient waste oil recovery system according to claim 1, characterized in that: After the upper drainage pipe and the lower drainage pipe are connected to the magnetic flap liquid level gauge (1) and the oil chamber respectively, the oil chamber liquid level is converted into potential energy through the U-shaped pipe connection, and is displayed by the magnetic flap liquid level gauge (1).

3. The efficient waste oil recovery system according to claim 2, characterized in that: An upper drainage pipe ball valve (2) is installed on the upper drainage pipe, and a lower drainage pipe ball valve (3) is installed on the lower drainage pipe. Both the upper drainage pipe ball valve (2) and the lower drainage pipe ball valve (3) are corrosion-resistant and high-temperature resistant ball valves.

4. The efficient waste oil recovery system according to claim 2, characterized in that: The liquid level transmitter (4) is electrically connected to the remote central control and is used to monitor the liquid level of the oil chamber. It can convert the actual liquid level data on site into an electrical signal and transmit it to the remote central control. The on-site value is compared with the central control set value, and the remote central control controls the opening or opening and closing state of the liquid level regulating valve (9).

5. The efficient waste oil recovery system according to claim 2, characterized in that: An exhaust valve (10) is installed at the upper end of the magnetic flap level gauge (1), and the exhaust valve (10) is a ball valve. A wire plug is installed at the end of the exhaust valve (10), which provides a fluid channel when the magnetic flap level gauge (1) is discharged or flushed.

6. The efficient waste oil recovery system according to claim 1, characterized in that: The material of the oil receiving pipeline (11) is corrosion-resistant and pressure-resistant carbon steel. The oil receiving pipeline (11) is connected to the lower end of the magnetic flap level gauge (1) through a docking flange, and the flange is bolted. A high-temperature and corrosion-resistant graphite spiral wound gasket is installed at the docking flange.

7. The efficient waste oil recovery system according to claim 4, characterized in that: The regulating valve group comprises a liquid level regulating valve (9), a regulating valve front ball valve (12), a regulating valve rear ball valve (13) and a regulating valve bypass (14). The regulating valve group comprises two parallel pipelines, one of which is sequentially installed with the regulating valve front ball valve (12), the liquid level regulating valve (9) and the regulating valve rear ball valve (13), and the other pipeline is installed with the regulating valve bypass (14).

8. The efficient waste oil recovery system according to claim 7, characterized in that: When the liquid level in the oil chamber rises to a set level, the liquid level transmitter (4) transmits a signal to the liquid level regulating valve (9), controlling the opening or closing of the liquid level regulating valve (9) to collect oil.

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