Oil product recovery and quality inspection system and aviation oil storage system

Abstract

The application provides an oil recovery quality inspection system and an aviation oil storage system. The oil recovery quality inspection system comprises a main pipeline, an oil pump unit, a plurality of oil quality inspection units and an oil recovery unit. The main pipeline comprises an outlet end and a plurality of inlet ends. The inlet of the oil pump unit is connected to the outlet end. The plurality of oil quality inspection units are used to be connected to corresponding oil storage tanks and are distributed along the main pipeline at intervals. The oil quality inspection unit comprises a first flow meter and a sampler. The first flow meter and the sampler are connected in parallel between the outlet of the oil storage tank and the inlet end. The first flow meter is used to measure the amount of oil flowing out from the bottom of the oil storage tank. The sampler is used to sample and detect the oil at the bottom of the oil storage tank. The outlet of the oil recovery unit is connected to the outlet of the oil pump unit. The outlet of the oil recovery unit is connected to the inlet end. In this way, the arrangement of the pipeline is simplified, the cost is reduced, and the staff can be protected from directly facing the oil, thereby protecting the staff's body and the environment.

Description

Technical Field

[0001] This application relates to the field of aviation fuel storage technology, and more particularly to an oil recovery and quality inspection system and an aviation fuel storage system including the oil recovery and quality inspection system. Background Technology

[0002] In traditional oil recovery systems, oil from the bottom of multiple storage tanks needs to be recovered and stored through different recovery pipelines. The pipeline distribution is intricate and complex, occupies a large area, and requires a lot of manpower and resources, resulting in high costs.

[0003] When recovering oil, the oil at the bottom of the storage tank needs to be drained to a certain amount before quality inspection. Currently, the draining process and the amount drained both require manual operation. This means workers must directly face the oil and observe its quantity, posing a significant health hazard. Furthermore, the oil is exposed to the air during this process, causing environmental pollution. Summary of the Invention

[0004] This application provides an improved oil recovery and quality inspection system and an aviation fuel storage system including the oil recovery and quality inspection system.

[0005] This application provides an oil recycling quality inspection system, including:

[0006] The main pipeline includes an export end and multiple import ends;

[0007] Oil pump unit, wherein the inlet of the oil pump unit is connected to the outlet end;

[0008] Multiple oil quality inspection units are used to connect to corresponding oil storage tanks and are distributed at intervals along the main pipeline. Each oil quality inspection unit includes a first flow meter and a sampler. The first flow meter and the sampler are connected in parallel between the outlet and the inlet of the oil storage tank. The first flow meter is used to measure the amount of oil flowing out from the bottom of the oil storage tank, and the sampler is used to sample and test the oil at the bottom of the oil storage tank.

[0009] An oil recovery unit is provided, with its inlet connected to the outlet of the oil pump unit and its outlet connected to the inlet. The main pipeline is used to receive the oil flowing out of the oil quality inspection unit. The oil pump unit is used to transport the oil in the main pipeline to the oil recovery unit. The oil recovery unit is used to recover and store the oil.

[0010] Optionally, the oil recovery quality inspection system includes a first solenoid valve located at the inlet of the first flow meter, the first solenoid valve being used to control the opening or closing of the inlet of the first flow meter.

[0011] Optionally, the oil recovery quality inspection system includes a first controller electrically connected to the first solenoid valve and the first flow meter. The first controller is used to control the first solenoid valve to disconnect when the oil volume of the first flow meter reaches a preset capacity, so as to close the inlet of the first flow meter.

[0012] Optionally, the oil recovery and quality inspection system further includes a recovery pipeline, wherein the plurality of oil quality inspection units are spaced apart on both sides of the main pipeline and connected to the inlet end through the recovery pipeline.

[0013] Optionally, the main pipeline and the recycling pipeline are located on the same horizontal plane.

[0014] Optionally, the inlet of the oil pump unit is positioned lower than the outlet.

[0015] Optionally, the oil recovery and quality inspection system further includes a buffer pipeline, the inlet of which is connected to the outlet end, and the outlet of which is connected to the inlet of the oil pump unit. The inlet of the buffer pipeline is positioned lower than the outlet end.

[0016] Optionally, the buffer pipeline includes a first end connected to the outlet end and a second end connected to the inlet of the oil pump unit, wherein the second end is positioned lower than the first end.

[0017] Optionally, the oil recovery and quality inspection system further includes a buffer tank located at the outlet end. The buffer tank is positioned lower than the main pipeline, and the oil pump unit is located within the buffer tank.

[0018] Optionally, the oil pump unit includes a pump, an inlet valve, and an outlet valve. The inlet valve is connected between the inlet of the pump and the outlet end, and the outlet valve is connected between the outlet of the pump and the inlet of the oil recovery unit.

[0019] Optionally, the inlet valve remains normally open; and / or

[0020] The outlet valve is not fully open.

[0021] Optionally, the oil pump unit further includes an exhaust valve, which is located between the pump outlet and the outlet valve.

[0022] Optionally, the vent valve includes an automatic vent valve; and / or

[0023] The exhaust valve remains in the normally open position.

[0024] Optionally, the oil recovery unit includes a first oil recovery unit and a second oil recovery unit, wherein the first oil recovery unit and the second oil recovery unit are connected in parallel between the outlet and the inlet of the oil pump unit, and the quality of the oil recovered by the first oil recovery unit is higher than the quality of the oil recovered by the second oil recovery unit.

[0025] Optionally, the oil recovery unit includes a second flow meter and a recovery tank. The inlet of the recovery tank is connected to the outlet of the oil pump unit. The second flow meter is connected between the outlet and the inlet of the recovery tank. The second flow meter is used to measure the amount of oil at the bottom of the recovery tank. The recovery tank is used to recover and store the oil.

[0026] Optionally, the oil recovery quality inspection system includes a second solenoid valve located at the inlet of the second flow meter, the second solenoid valve being used to control the opening or closing of the inlet of the second flow meter.

[0027] Optionally, the oil recovery quality inspection system includes a second controller electrically connected to the second solenoid valve and the second flow meter. The second controller is used to control the second solenoid valve to de-energize when the oil volume in the second flow meter reaches a preset capacity, so as to close the inlet of the second flow meter.

[0028] Optionally, the recovery pipeline includes a first recovery pipeline and a second recovery pipeline, the recovery tank is connected to the outlet of the oil pump unit through the first recovery pipeline, and the second flow meter is connected to the inlet end through the second recovery pipeline.

[0029] Optionally, a first ball valve is provided on the second recovery pipeline, and the first ball valve is located downstream of the outlet of the second flow meter.

[0030] Optionally, the recovery pipeline includes a third recovery pipeline and a fourth recovery pipeline. The second flow meter is connected to the treatment tank through the third recovery pipeline, and the second flow meter is connected to the zero-level tank through the fourth recovery pipeline. The mass of the oil stored in the treatment tank is higher than the mass of the oil stored in the zero-level tank.

[0031] Optionally, a second ball valve is provided on the third recovery pipeline, and the second ball valve is located upstream of the inlet of the treatment tank; a third ball valve is provided on the fourth recovery pipeline, and the third ball valve is located upstream of the inlet of the zero-position tank.

[0032] Optionally, the first ball valve is positioned higher than the second and third ball valves.

[0033] Optionally, the recovery tank is equipped with a safety level line, which does not exceed half the height of the recovery tank; the oil recovery quality inspection system also includes multiple backup tanks and conveying pipelines, the backup tanks are connected to the recovery tanks through the conveying pipelines, and the conveying pipelines are used to convey at least a portion of the oil in the recovery tanks to the backup tanks for storage when the oil in the recovery tanks exceeds the safety level line.

[0034] Optionally, the recovery pipeline includes a third recovery pipeline and a fourth recovery pipeline; the first flow meter is connected to the oil storage tank through the third recovery pipeline, and the first flow meter is connected to the inlet end through the fourth recovery pipeline.

[0035] Optionally, the third recovery pipeline and the fourth recovery pipeline are located on the same horizontal plane.

[0036] Optionally, the third recovery pipeline is provided with a fourth ball valve and a first automatic return valve. The fourth ball valve is located downstream of the outlet of the oil storage tank, and the first automatic return valve is located upstream of the inlet of the first flow meter. The fourth recovery pipeline is provided with a fifth ball valve, which is located downstream of the outlet of the first flow meter.

[0037] Optionally, the fourth ball valve remains in the normally open state.

[0038] Optionally, the recovery pipeline includes a fifth recovery pipeline and a sixth recovery pipeline; the sampler is connected to the third recovery pipeline through the fifth recovery pipeline, and the sampler is connected to the fourth recovery pipeline through the sixth recovery pipeline.

[0039] Optionally, the fifth recovery pipeline and the sixth recovery pipeline are located on the same horizontal plane.

[0040] Optionally, the fifth and sixth recovery pipelines are positioned no higher than the third and fourth recovery pipelines.

[0041] Optionally, a second automatic return valve is provided on the fifth recovery pipeline, and the second automatic return valve is located upstream of the inlet of the sampler.

[0042] This application also provides an aviation fuel storage system, including multiple fuel storage tanks and the fuel recovery and quality inspection system described in any of the above claims, wherein multiple fuel quality inspection units of the fuel recovery and quality inspection system correspond to the multiple fuel storage tanks.

[0043] According to the technical solution provided in the embodiments of this application, it includes a main pipeline, an oil pump unit, multiple oil quality inspection units, and an oil recovery unit. The multiple oil quality inspection units are connected to corresponding oil storage tanks and are distributed at intervals along the main pipeline. Each oil quality inspection unit includes a first flow meter and a sampler. The first flow meter and the sampler are connected in parallel between the outlet and inlet of the oil storage tank. With this arrangement, the amount of oil flowing out from the bottom of the oil storage tank can be measured by the first flow meter without the need for staff to observe, thus avoiding direct contact between staff and the oil and protecting the health of staff and the environment. In addition, the multiple oil quality inspection units discharge the oil from the bottom of the oil storage tanks into the main pipeline and transport the oil in the main pipeline to the oil recovery unit for recycling and storage through the oil pump unit, simplifying the pipeline layout and reducing costs. Attached Figure Description

[0044] Figure 1 The diagram shown is a structural schematic of one embodiment of the aviation fuel storage system of this application;

[0045] Figure 2 The diagram shown is a structural schematic of an embodiment of the first flow meter of the oil quality inspection unit of this application;

[0046] Figure 3 As shown Figure 2 A cross-sectional schematic diagram of an embodiment of the first flow meter is shown;

[0047] Figure 4 As shown Figure 2 The circuit diagram shown is a schematic diagram of one embodiment of the first flow meter.

[0048] Figure 5 The diagram shown is a cross-sectional schematic of an embodiment of the pump unit of this application, wherein the reed switch of the pump is open;

[0049] Figure 6 As shown Figure 5 The diagram shows another cross-sectional view of the pump unit, in which the pump's reed switch is closed;

[0050] Figure 7 The diagram shown is a structural schematic of another embodiment of the aviation fuel storage system of this application;

[0051] Figure 8 The diagram shown is a structural schematic of yet another embodiment of the aviation fuel storage system of this application. Detailed Implementation

[0052] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0053] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The words “a” or “one” and similar terms used in this specification and claims do not indicate a limitation of quantity, but rather indicate the presence of at least one. “A plurality” includes two, equivalent to at least two. The words “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” covers the element or object listed following “comprising” or “including” and its equivalents, and does not exclude other elements or objects. The words “connected” or “linked” and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this specification and appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0054] The oil recovery and quality inspection system of this application includes a main pipeline, an oil pump unit, multiple oil quality inspection units, and an oil recovery unit. The main pipeline includes an outlet end and multiple inlet ends. The inlet of the oil pump unit is connected to the outlet end. The multiple oil quality inspection units are connected to corresponding oil storage tanks and are distributed at intervals along the main pipeline. Each oil quality inspection unit includes a first flow meter and a sampler. The first flow meter and the sampler are connected in parallel between the outlet and inlet ends of the oil storage tanks. The first flow meter is used to measure the amount of oil flowing out from the bottom of the oil storage tank, and the sampler is used to sample and test the oil at the bottom of the oil storage tank. The inlet of the oil recovery unit is connected to the outlet of the oil pump unit, and the outlet of the oil recovery unit is connected to the inlet end. The main pipeline receives the oil flowing out from the oil quality inspection units, the oil pump unit transports the oil in the main pipeline to the oil recovery unit, and the oil recovery unit recovers and stores the oil.

[0055] This setup allows for the measurement of the amount of oil flowing from the bottom of the storage tank using a first flow meter, eliminating the need for staff to observe and avoiding direct contact with the oil, which is beneficial to staff health and does not cause environmental pollution. Multiple oil quality inspection units are connected to the main pipeline, and the oil in the main pipeline is uniformly transported to the oil recovery unit for recycling and storage via an oil pump unit. Compared with related technologies, this shortens the recovery cycle, reduces manpower and time, simplifies pipeline layout, and lowers costs.

[0056] This application provides an aviation fuel storage system, including multiple fuel storage tanks and a fuel recovery and quality inspection system. Multiple fuel quality inspection units within the fuel recovery and quality inspection system correspond to the multiple fuel storage tanks. In some embodiments, this aviation fuel storage system is used for quality inspection and recycling of civil aviation fuel. The fuel recovery and quality inspection system can inspect and recycle fuel stored at the bottom of the fuel storage tanks. By connecting multiple fuel storage tanks to the fuel recovery and quality inspection system, the fuel at the bottom of the multiple fuel storage tanks is discharged into a main pipeline through multiple fuel quality inspection units. The fuel in the main pipeline is then uniformly transported to the fuel recovery unit for recycling and storage via a fuel pump unit. Compared with related technologies, this simplifies pipeline layout and reduces costs. During this process, the amount of fuel flowing from the bottom of the fuel storage tanks can be measured using a first flow meter without requiring personnel observation, avoiding direct contact with the fuel and benefiting the health of workers, while also preventing environmental pollution.

[0057] Figure 1 The diagram shown is a structural schematic of one embodiment of the aviation fuel storage system 200 of this application. The aviation fuel storage system 200 includes multiple fuel storage tanks 50 and a fuel recovery and quality inspection system 100. Figure 1As shown, the oil recovery and quality inspection system 100 includes multiple oil quality inspection units 10, a main pipeline 20, an oil pump unit 30, and an oil recovery unit 40. The multiple oil quality inspection units 10 are connected to the same oil pump unit 30 via the main pipeline 20. In some embodiments, the main pipeline 20 includes an outlet end 21 and multiple inlet ends 22. The main pipeline 20 includes a pipe body, and the multiple inlet ends 22 are disposed on the pipe wall of the pipe body, which may be located at the end of the pipe body away from the outlet end 21 (or, the end opposite to the outlet end 21). The main pipeline 20 is used to receive oil flowing out from the oil quality inspection units 10. Here, "oil" refers to petroleum products, such as aviation kerosene, or simply "aviation fuel." In other embodiments, the oil may be other petroleum products, and this application is not limited to these. In some embodiments, the inlet of the oil pump unit 30 is connected to the outlet end 21, and the oil pump unit 30 is used to transport the oil in the main pipeline 20 to the oil recovery unit 40. In this embodiment, the oil pump unit 30 may be a self-priming centrifugal pump. In some other embodiments, the oil pump unit 30 may be other types of pumps, and this application is not limited to this. In some embodiments, multiple oil quality inspection units 10 are used to connect to corresponding oil storage tanks 50. The multiple oil quality inspection units 10 are distributed at intervals along the main pipeline 20, and the outlet of the oil quality inspection unit 10 is connected to the inlet end 22. The oil quality inspection unit 10 is used to receive oil from the bottom of the oil storage tank 50 for testing. Here, the oil storage tank 50 refers to an oil tank. Oil tanks are large in volume. To ensure safety and compliance with national standards, the multiple oil storage tanks 50 are distributed at intervals between every two oil storage tanks 50, and the interval between two oil storage tanks 50 is not less than half the sum of the heights of the two oil storage tanks 50. For example, in this embodiment, the height of the oil storage tank 50 is 18 meters. Therefore, in the direction along the main pipeline 20, the distance between two oil storage tanks 50 is not less than 18 meters to ensure safety and compliance with national standards. Therefore, distributing multiple oil quality inspection units 10 at intervals along the main pipeline 20 complies with national standards and ensures safety.

[0058] In some embodiments, the inlet of the oil recovery unit 40 is connected to the outlet of the oil pump unit 30, and the outlet of the oil recovery unit 40 is connected to the inlet end 22. The oil recovery unit 40 is used for recovering and storing oil. The oil recovery unit 40 is used, on the one hand, to recover high-quality oil, for example, oil that needs to be tested before reuse and can be reused if it passes the test; on the other hand, it is used to store low-quality oil for other processing. This configuration allows for full utilization of the oil at the bottom of the storage tank 50 and enables periodic recovery and reuse of the oil at the bottom of the storage tank 50, thereby improving the quality of the oil in the storage tank 50. Oil from the bottom of multiple storage tanks 50 is discharged into the main pipeline 20 through multiple oil quality inspection units 10. The oil in the main pipeline 20 is then uniformly transported to the oil recovery unit 40 for recovery and storage via oil pump unit 30. This simplifies pipeline layout, reduces costs, and because the amount of oil discharged from the bottom of each storage tank 50 into the corresponding oil quality inspection unit 10 for quality inspection is relatively small, collecting and uniformly recovering the oil discharged from the bottom of multiple storage tanks 50 can shorten the recovery cycle and reduce manpower and time.

[0059] In some embodiments, the oil quality inspection unit 10 includes a first flow meter 11 and a sampler 13. The first flow meter 11 and the sampler 13 are connected in parallel between the outlet and inlet 22 of the oil storage tank 50. The first flow meter 11 is used to measure the amount of oil flowing out from the bottom of the oil storage tank 50, and the sampler 13 is used to sample and test the oil at the bottom of the oil storage tank 50. Since the recovery pipeline 60 connecting the first flow meter 11 (or sampler 13) and the oil storage tank 50 is a certain distance away, the first flow meter 11 needs to measure a portion of the oil at the bottom of the oil storage tank 50 (wherein, this portion of the oil includes the oil in the fifth recovery pipeline 65 connecting the first flow meter 11 and the oil storage tank 50) to discharge a portion of the oil to the first flow meter 11, so that the oil obtained by the subsequent sampler 13 is more representative, thereby reducing the detection error. This setup allows the first flow meter 11 to measure the amount of oil flowing from the bottom of the oil storage tank 50, avoiding direct contact between workers and the oil, which is beneficial to the workers' health and will not cause pollution to the environment.

[0060] In some embodiments, the oil quality inspection unit 10 includes a first solenoid valve 111 and a first controller 112, located at the inlet of the first flow meter 11. The first solenoid valve 111 controls the opening or closing of the inlet of the first flow meter 11. The first controller 112 is electrically connected to the first solenoid valve 111 and the first flow meter 11. The first controller 112 controls the first solenoid valve 111 to open when the flow rate of the first flow meter 11 reaches a preset capacity (e.g., 70L-90L, preferably 80L), thereby closing the inlet of the first flow meter 11. In some embodiments, when it is necessary to discharge oil from the bottom of the oil storage tank 50 into the first flow meter 11, the first controller 112 controls the first solenoid valve 111 to open, and the first flow meter 11 begins to measure the oil flowing out from the bottom of the oil storage tank 50. In some embodiments, when the oil volume of the first flow meter 11 reaches the preset capacity, a feedback signal is sent to the first controller 112. At this time, the first controller 112 controls the first solenoid valve 111 to close, and the first flow meter 11 stops measuring the oil flowing out from the bottom of the oil storage tank 50.

[0061] Figure 2 The diagram shown is a structural schematic of an embodiment of the first flow meter 11 of the oil quality inspection unit 10 of this application. Figure 3 As shown Figure 2 A cross-sectional schematic diagram of one embodiment of the first flow meter 11 is shown; Figure 4 As shown Figure 2 The diagram shows a circuit schematic of one embodiment of the first flow meter 11. In some embodiments, the first flow meter 11 may be an eddy current flow meter. In other embodiments, the first flow meter 11 may also be a float flow meter. In still other embodiments, the first flow meter 11 may also be other types of flow meters, which are not limited to this application and will not be described in detail here.

[0062] like Figures 2 to 4 As shown, the first flow meter 11 includes a housing, a turbine disposed inside the housing, an induction coil 115 wound around the outside of the housing, and a signal conversion circuit 113 electrically connected to the induction coil 115. The turbine is used to generate a driving force on the oil flowing into the inlet of the first flow meter 11 to drive the oil to rotate. The induction coil 115 is used to generate a corresponding induction signal when the oil rotates. The signal conversion circuit 113 is used to convert the induction signal into a corresponding flow rate value of the oil.

[0063] exist Figure 4In the illustrated embodiment, the signal conversion circuit 113 includes an amplifier 1131 connected to the induction coil 115, a counter 1132 and a frequency converter 1133 electrically connected to the amplifier 1131. The amplifier 1131 amplifies and shapes the induced signal output by the induction coil 115, the counter 1132 calculates and indicates the cumulative flow rate of the oil flowing into the housing, and the frequency converter 1133 calculates and indicates the instantaneous flow rate of the oil flowing into the housing. In some embodiments, the first flow meter 11 further includes a display 114 (e.g., ...). Figure 2 As shown, the signal conversion circuit 113 (electrically connected to counter 1132 and frequency converter 1133) is used to display the cumulative flow value and instantaneous flow meter output by the signal conversion circuit 113, which is convenient for staff to observe.

[0064] In some embodiments, the turbine includes a bearing 1121 and blades 1122 fixed to the bearing, the bearing 1121 being fixed within a housing. When oil flows into the housing, it impacts the turbine blades 1122, generating a driving torque that causes the blades 1122 to rotate against frictional torque and oil resistance torque. Within a certain flow range, for a given oil viscosity, the rotational angular velocity of the blades 1122 is proportional to the oil flow velocity. Therefore, the oil flow velocity can be obtained from the rotational angular velocity of the blades 1122, allowing the calculation of the amount of oil passing through the housing. In some embodiments, the rotational speed of the blades 1122 is detected by an induction coil 115 mounted outside the housing. When the blades 1122 cut the magnetic lines of force generated by a permanent magnet within the housing, a change in magnetic flux occurs in the induction coil 115. Figure 3 In this embodiment, the induction coil 115 and the permanent magnet 116 are fixed together on the housing. When the ferromagnetic blade 1122 passes the permanent magnet 116, it causes a change in the magnetic flux in the induction coil 115, thereby generating an induced signal.

[0065] Furthermore, the induction coil 115 sends the detected periodic change signal of magnetic flux (induction signal) to the amplifier 1131, which amplifies and shapes the signal to generate a pulse signal proportional to the flow rate. This pulse signal is then sent to the counter 1132 for unit conversion and flow accumulation calculation to obtain and display the cumulative flow value (i.e., the amount of oil flowing out from the bottom of the storage tank 50). Simultaneously, the pulse signal can also be sent to the frequency converter 1133, which converts the pulse signal into an analog current, thereby indicating the instantaneous flow value (i.e., the instantaneous amount of oil flowing out from the bottom of the storage tank 50). Finally, the output cumulative flow value and instantaneous flow meter reading are displayed on the display 114 for easy observation by staff.

[0066] With this configuration, the first flow meter 11 can be used to detect the instantaneous amount and total cumulative amount of oil. Its output signal is frequency, which is easy to digitize. Furthermore, the first flow meter 11 has low pressure loss, and its blades 1122 are corrosion-resistant, allowing it to measure viscous and corrosive media. Compared with related technologies, this first flow meter 11 can measure the amount of oil flowing out from the bottom of the oil storage tank 50 (including total volume and instantaneous flow rate), avoiding direct contact between workers and the oil, which is beneficial to the health of workers and does not cause environmental pollution.

[0067] In some embodiments, multiple oil quality inspection units 10 (e.g., three or more) can be provided, with the multiple oil quality inspection units 10 spaced apart on both sides of the main pipeline 20. This arrangement effectively utilizes the area on both sides of the main pipeline 20, allowing the multiple oil quality inspection units 10 to be evenly distributed, reducing the floor space required, simplifying the pipeline layout, and lowering costs. In some embodiments, the oil recovery quality inspection system 100 also includes a recovery pipeline 60, through which the multiple oil quality inspection units 10 are connected to the inlet end 22. The multiple oil quality inspection units 10 are connected to the inlet end 22 via the recovery pipeline 60, reducing the number of main pipelines 20 to be laid, reducing the floor space required by the main pipeline 20, thereby simplifying the pipeline layout and lowering costs.

[0068] In this embodiment, the oil storage tank 50 is a conical bottom tank (e.g., Figure 1 As shown, utilizing the static pressure generated by the conical-bottom tank (which generates a large static pressure and thus a high pressure), and by placing the main pipeline 20 and the recovery pipeline 60 on the same horizontal plane, moisture and impurities at the bottom of the storage tank 50 can be easily discharged, thereby improving recovery efficiency. Furthermore, since the entire system occupies a large area, setting the main pipeline 20 and the recovery pipeline 60 horizontally and on the same horizontal plane reduces construction complexity and thus lowers costs. In some other embodiments, the main pipeline 20 and the recovery pipeline 60 may not be on the same horizontal plane.

[0069] In some embodiments, the oil pump unit 30 includes a self-priming centrifugal pump, which can deliver oil due to centrifugal force. In some embodiments, the oil pump unit 30 includes a pump 31, an inlet valve 32, and an outlet valve 33. The inlet valve 32 is connected between the inlet and outlet end 21 of the pump 31, and the outlet valve 33 is connected between the outlet of the pump 31 and the inlet of the oil recovery unit 40. To ensure that all the oil discharged from the outlet end 21 can be discharged into the pump 31, the inlet size of the pump 31 is adapted to the size of the outlet end 21. Before the oil pump unit 30 operates, the pump 31 must be filled with oil to form a vacuum. When the impeller rotates rapidly, the blades cause the oil to rotate quickly. The rotating oil flies out of the impeller under the action of centrifugal force. After the oil in the pump 31 is thrown out, a vacuum area is formed in the central part of the impeller. The oil in the main pipeline 20 is pressed into the oil recovery unit 40 through the recovery pipeline 60 under the action of atmospheric pressure or oil pressure. This cyclical operation enables continuous oil extraction. It is important to note that the self-priming centrifugal pump must be fully filled with oil before starting. Otherwise, the pump 31 will overheat, vibrate, and reduce the oil output, potentially damaging the pump unit 30 and causing an equipment accident. Therefore, the inlet of the pump unit 30 is positioned lower than the outlet 21, and the inlet valve 32 is kept normally open. This ensures that the inlet of the pump unit 30 (pump 31) is full of oil before startup, guaranteeing normal operation. Furthermore, to ensure that the pump 31 can smoothly transport the oil in the main pipeline 20 to the oil recovery unit 40, the outlet valve 33 is not fully open. For example, opening the outlet valve 33 to no more than one-quarter of its opening increases the conveying pressure and speed, allowing the oil in the main pipeline 20 and recovery pipeline 60 to be quickly recovered to the oil recovery unit 40. It should be noted that the opening degree of the outlet valve 33 is determined according to the model (rated voltage / current) of the pump 31. When using the pump 31, opening the outlet valve 33 to one-quarter of its opening degree will generate pressure. This pressure can force the oil in the main pipeline 20 into the oil recovery unit 40. If the outlet valve 33 is opened too much, it will generate very strong pressure, for example, if the pressure is too high or the load is too heavy at the beginning of the operation, it may instantly reach the rated voltage / current of the pump 31, which may easily burn out the pump 31. Therefore, when the pump 31 is first started, the outlet valve 33 is not set to be fully open. For example, the opening of the outlet valve 33 should not exceed one-quarter. On the one hand, the pressure generated is sufficient, and on the other hand, it will not have any side effects on the pump 31 itself.

[0070] Figure 5 The diagram shown is a cross-sectional view of an embodiment of the pump 31 of the oil pump unit 30 of this application, wherein the reed switch 311 of the pump 31 is open; Figure 6 As shown Figure 5Another cross-sectional schematic diagram of the pump 31 of the oil pump unit 30 is shown, wherein the reed switch 311 of the pump 31 is closed. In some embodiments, the oil pump unit 30 includes an automatic mode. Figure 5 and Figure 6 As shown, the pump 31 is equipped with a float switch, which includes a reed switch 311 and a float 312 disposed within the reed switch 311. The reed switch 311 is electrically connected to an external power switch. In some embodiments, the reed switch 311 includes two magnetizable reeds 313 (typically composed of iron and nickel) and a magnetic element 314 sleeved within the float 312. The magnetic element 314 can be a permanent magnet or an electromagnetic coil. The two reeds 313 are sealed within a glass tube, and the reeds 313 function as a magnetic flux conductor. Figure 5 As shown, the two reeds 313 are not in contact when not in operation. Figure 6 As shown, when the magnetic field generated by the magnetic component 314 passes through the magnetic field, the applied magnetic field causes different polarities to be generated near the endpoints of the two springs. When the magnetic force exceeds the elastic force of the springs 313 themselves, the two springs 313 will attract each other and conduct the circuit. When the magnetic field weakens or disappears, the springs 313 will release due to their own elasticity, and the two springs 313 will separate, thereby opening the circuit. In this embodiment, when the water level in the pump 31 rises, the float 312 drives the magnetic component 314 to rise. Under the action of the applied magnetic field, the two springs 313 attract each other, causing the power switch to conduct, and the pump 31 is started at this time. When the water level in the pump 31 falls, the float 312 drives the magnetic component 314 to fall. After the magnetic field weakens or disappears, the springs 313 will release due to their own elasticity, and the pump 311 is turned off at this time. Compared with related technologies, the pump 31 using the oil pump unit 30 can automatically pump oil and automatically shut down, without the need for real-time monitoring by personnel. This setup reduces manpower significantly. Furthermore, in this embodiment, only one oil pump unit 30 is needed to provide power, allowing the oil collected in the main pipeline 20 to be recovered to the oil recovery unit 40. Compared with related technologies, this reduces the number of oil pump units 30 and lowers costs. Additionally, the pump 31 can only start when the liquid level in the float switch reaches a certain height and the reed switch 311 closes. If each oil storage tank 50's oil quality inspection unit 10 is connected to one oil pump unit 30, due to the smaller amount of oil, even less oil is pumped out, leaving more oil in the recovery pipeline 60 of the oil quality inspection unit 10. Oil discharged from the bottom of multiple oil storage tanks 50 flows into the main pipeline 20, resulting in a larger total amount of oil flowing into the pump 31 inlet. This, combined with the higher liquid level in the float switch, causes the reed switch 311 to remain closed for a longer period, resulting in the pump 31 pumping out more oil.

[0071] It should be noted that when oil needs to be recovered, the operator must turn on the main power supply of the distribution cabinet connected to the pump 31 and set the control mode of the pump 31 to automatic mode. The pump 31 will start when oil flows into the main pipeline 20, and the permanent magnet or electromagnetic coil of the float 312 rises and the two springs 313 engage, thus discharging the oil into the oil recovery unit 40. As the amount of oil flowing into the pump 31 from the main pipeline 20 gradually decreases, and the permanent magnet or electromagnetic coil of the float 312 descends, the two springs 313 will release after the magnetic field weakens or disappears, thus ending the recovery process. Upon completion of the recovery, the main power supply of the distribution cabinet should be turned off, the control mode of the pump 31 should be set to intermediate mode, and the outlet valve 33 of the pump 31 should be closed. This intermediate mode can be a non-automatic mode, and is not limited to this in this application.

[0072] In some embodiments, the oil pump unit 30 further includes an exhaust valve 34, which is located between the outlet of the pump 31 and the outlet valve 33. The exhaust valve 34 is used to remove air from the pump 31, ensuring that the oil delivered by the outlet valve 33 is free of air. In some embodiments, the exhaust valve 34 includes an automatic exhaust valve. In some embodiments, the exhaust valve 34 is equipped with a float switch (not shown). The exhaust valve 34 remains normally open. When the pump 31 is first started, the oil in the pump 31 is not fully discharged from the outlet, and some air is discharged through the exhaust valve 34 (generally, air is discharged upwards). Then, as the oil level rises, when the oil in the pump 31 is fully discharged from the outlet, i.e., the float switch reaches the upper limit of the liquid level, the exhaust valve 34 automatically closes without manual operation, which is simple and quick.

[0073] Figure 7 The diagram shown is a structural schematic of another embodiment of the aviation fuel storage system 200 of this application. In this embodiment, the fuel pump unit 30 is a self-priming centrifugal pump, and to ensure that the inlet of the fuel pump unit 30 is fully filled with fuel before startup... Figure 7As shown, the oil recovery and quality inspection system 100 also includes a buffer pipeline 23. The inlet of the buffer pipeline 23 is connected to the outlet end 21, and the outlet of the buffer pipeline 23 is connected to the inlet of the oil pump unit 30. The inlet of the buffer pipeline 23 is positioned lower than the outlet end 21, creating a terrain difference between the inlet of the oil pump unit 30 and the outlet end 21 of the main pipeline 20, ensuring that the inlet of the pump 31 is filled with oil as much as possible. Because the pump 31 can only be started when the liquid level in it reaches a certain height, if each oil quality inspection unit 10 of the oil storage tank 50 is connected to an oil pump unit 30, the pump 31 cannot start due to insufficient oil. Furthermore, even if the pump 31 can start, less oil is pumped out, leaving more oil in the recovery pipeline 60 of the oil quality inspection unit 10. If the oil discharged from the bottom of multiple oil storage tanks 50 flows into the main pipeline 20, the total amount of oil flowing into the inlet of the pump 31 will be large. When all the oil is collected, the liquid level in the pump 31 will be high, so that the inlet of the pump 31 is filled with oil as much as possible, ensuring normal start-up. Furthermore, unified recovery can make more oil pumped out. In addition, the setting position of the inlet of the buffer pipeline 23 is lower than the setting position of the outlet end 21, which can also ensure that the oil in the main pipeline 20 is more easily discharged.

[0074] In some embodiments, the buffer pipeline 23 includes a first end 231 connected to the outlet end 21 and a second end 232 connected to the inlet of the oil pump unit 30. The second end 232 is positioned lower than the first end 231. Since the amount of oil discharged from the bottom of each oil storage tank 50 into the corresponding oil quality inspection unit 10 is relatively small, the second end 232 is positioned lower than the first end 231, i.e., there is a terrain difference between the second end 232 and the first end 231. This creates a terrain difference between the inlet of the oil pump unit 30 connected to the second end 232 and the outlet end 21 of the main pipeline 20 connected to the first end 231, ensuring that the inlet of the pump 31 is filled with oil as much as possible. Because the pump 31 can only be started when the liquid level in it reaches a certain height, if each oil storage tank 50's oil quality inspection unit 10 is connected to an oil pump unit 30, the pump 31 will not be able to start due to insufficient oil. Furthermore, even if the pump 31 can start, less oil will be pumped out, leaving more oil in the recovery pipeline 60 of the oil quality inspection unit 10. If the oil discharged from the bottom of multiple oil storage tanks 50 flows into the main pipeline 20, the total amount of oil flowing into the inlet of the pump 31 will be greater. This collective accumulation will result in a higher liquid level in the pump 31, ensuring that the inlet of the pump 31 is filled with oil as much as possible, guaranteeing normal startup. Furthermore, unified recovery allows for the pumping out of more oil. Additionally, the elevation difference between the inlet of the oil pump unit 30 connected to the second end 232 and the outlet end 21 of the main pipeline 20 connected to the first end 231 ensures that the oil in the main pipeline 20 is more easily discharged. In some embodiments, the diameter of the first end 231 of the buffer pipe 23 matches the diameter of the outlet end 21, and the diameter of the second end 232 of the buffer pipe 23 matches the inlet size of the oil pump unit 30 (pump 31). In some embodiments, the first end 231 of the buffer pipe 23 may be located at the same horizontal plane as the outlet end 21, and the second end 232 of the buffer pipe 23 may be positioned lower than the first end 231 of the buffer pipe 23, creating a terrain difference between the inlet of the oil pump unit 30 and the outlet end 21 of the main pipe 20, thereby ensuring that the inlet of the pump 31 is filled with oil and can start normally. In some other embodiments, the first end 231 of the buffer pipeline 23 is inclined and can have a preset angle with the outlet end 21. The second end 232 of the buffer pipeline 23 can be horizontally set and the setting position is lower than the setting position of the outlet end 21, so that there is a terrain difference between the inlet of the oil pump unit 30 and the outlet end 21 of the main pipeline 20, thereby ensuring that the inlet of the pump 31 is filled with oil and can start normally.

[0075] Figure 8 The diagram shown is a structural schematic of yet another embodiment of the aviation fuel storage system 200 of this application. Figure 8As shown, the oil recovery and quality inspection system 100 includes a buffer tank 24 located at the outlet end 21. The buffer tank 24 is positioned lower than the main pipeline 20, and the oil pump unit 30 is housed within the buffer tank 24. Figure 8 In the illustrated embodiment, the pump 31 and the inlet valve 32 are located within the buffer tank 24 to ensure that the inlet of the pump 31 is filled with as much oil as possible. The pipeline connected to the inlet valve 32 of the pump 31 extends along the tank wall of the buffer tank 24 (e.g., Figure 8 As shown, since the amount of oil discharged from the bottom of each oil storage tank 50 into the corresponding oil quality inspection unit 10 is relatively small, by setting the oil pump unit 30 in the buffer tank 24 with a relatively low terrain, there is a terrain difference between the inlet of the oil pump unit 30 (pump 31) and the outlet end 21 of the main pipeline 20. On the one hand, it can better collect the oil discharged from the bottom of multiple oil storage tanks 50 and flow into the main pipeline 20, ensuring that the inlet of the pump 31 is filled with as much oil as possible to ensure normal start-up. On the other hand, it can make the oil in the main pipeline 20 discharge smoothly.

[0076] In some embodiments, the oil recovery unit 40 includes a first oil recovery unit 40a and a second oil recovery unit 40b. The first oil recovery unit 40a and the second oil recovery unit 40b are connected in parallel between the outlet and inlet 22 of the oil pump unit 30. The quality of the oil recovered by the first oil recovery unit 40a is higher than that of the oil recovered by the second oil recovery unit 40b. During oil recovery, clean oil is discharged into the first oil recovery unit 40a, while oil with lower quality or containing moisture or impurities is discharged into the second oil recovery unit 40b. This arrangement can effectively classify and process oils of different qualities, avoiding oil waste. For example, clean oil can be tested again, and if it meets the oil quality standards, it can be recycled. Oil with lower quality or containing moisture or impurities can undergo other treatments, such as being discharged into a water-oil separation tank or a sludge tank, or undergoing bottom draining operations in oil tanks. The specific measures taken can be selected according to the actual quality of the oil and are not limited in this application.

[0077] It should be noted that the first oil recovery unit 40a and the second oil recovery unit 40b have the same structural composition. Figure 1 The embodiments shown are denoted by the same reference numerals, and will not be repeated here.

[0078] In some embodiments, the recovery pipeline 60 includes a first recovery pipeline 61 and a second recovery pipeline 62, and the oil recovery unit 40 includes a recovery tank 41 and a second flow meter 42. The recovery tank 41 is connected to the outlet (outlet valve 33) of the oil pump unit 30 through the first recovery pipeline 61, and the second flow meter 42 is connected to the inlet end 22 through the second recovery pipeline 62. The recovery tank 41 is used to recover the oil discharged by the pump 31. To prevent microbial contamination, the second flow meter 42 is used to measure the amount of oil flowing out of the recovery tank 41. The second flow meter 42 can be an eddy current flow meter. In some other embodiments, the first flow meter 11 can also be a float flow meter. In other embodiments, the second flow meter 42 can also be other types of flow meters, and this application is not limited to these. It should be noted that the second flow meter 42 is similar to the first flow meter 11 in the above embodiments, and its structure and principle are also similar, so it will not be described again here.

[0079] In some embodiments, the oil recovery unit 40 includes a second solenoid valve 421 and a second controller 422 located at the inlet of the second flow meter 42. The second solenoid valve 421 controls the opening or closing of the inlet of the second flow meter 42. The second controller 422 is electrically connected to the second solenoid valve 421 and the second flow meter 42. The second controller 422 controls the second solenoid valve 421 to open when the flow rate of the second flow meter 42 reaches a preset capacity, thereby closing the inlet of the second flow meter 42. In some embodiments, when it is necessary to discharge oil from the bottom of the recovery tank 41 into the second flow meter 42, the second controller 422 controls the second solenoid valve 421 to open, and the second flow meter 42 begins to measure the oil flowing out from the bottom of the recovery tank 41. In some embodiments, when the oil volume in the second flow meter 42 reaches the preset capacity, a feedback signal is sent to the second controller 422. At this time, the second controller 422 controls the second solenoid valve 421 to close, and the second flow meter 42 stops measuring the oil flowing out from the bottom of the recovery tank 41.

[0080] In some embodiments, a first ball valve 621 is provided on the second recovery line 62, located downstream of the outlet of the second flow meter 42. Before checking the discharge, the first ball valve 621 is closed to prevent oil remaining in the second flow meter 42 (e.g., oil of low quality) from being discharged into the main line 20. Therefore, it is opened before discharge is required and closed when discharge is not required, avoiding mixing with clean oil and preventing waste. In some embodiments, the recovery line 60 includes a third recovery line 63 and a fourth recovery line 64. The second flow meter 42 is connected to the treatment tank 44 via the third recovery line 63 and to the zero-level tank 45 via the fourth recovery line 64. The quality of the oil stored in the treatment tank 44 is higher than that of the oil stored in the zero-level tank 45. Since the oil quality inspection unit 10 receives oil from the bottom of the storage tank 50, prolonged settling will result in some moisture or impurities. This moisture or impurities are then discharged sequentially through the main pipeline 20 and the oil pump unit 30 into the recovery tank 41. Therefore, most of the oil recovered in the recovery tank 41 contains moisture or impurities. Consequently, the oil in the recovery tank 41 is again collected by the second flow meter 42 for classification and processing. For example, it is discharged separately into the treatment pool 44 and the zero-level tank 45, which contain oils of different qualities, to avoid waste. Here, the treatment pool 44 can be an oil sludge treatment pool, and the zero-level tank 45 can be an underground oil sludge tank, where the quality of the oil stored is lower than that stored in the oil sludge treatment pool.

[0081] In some embodiments, a second ball valve 631 is provided on the third recovery line 63, and the second ball valve 631 is located upstream of the inlet of the treatment tank 44. Since the second ball valve 631 is located at the bottom of the second flow meter 42, it is closed before discharge inspection to prevent oil (e.g., clean oil) remaining in the second flow meter 42 from being discharged into the treatment tank 44. Therefore, it is opened before discharge is required to prevent clean oil from being mixed into the treatment tank 44, thus avoiding waste. In some embodiments, a third ball valve 641 is provided on the fourth recovery line 64, and the third ball valve 641 is located upstream of the inlet of the zero-level tank 45. Since the third ball valve 641 is located at the bottom of the second flow meter 42, it is closed before discharge inspection to prevent oil (e.g., clean oil) remaining in the second flow meter 42 from being discharged into the zero-level tank 45. Therefore, it is opened before discharge is required to prevent clean oil from being mixed into the zero-level tank 45, thus avoiding waste. In some embodiments, the first ball valve 621 is positioned higher than the second ball valve 631 and the third ball valve 641. Since some impurities or water settle at the bottom of the mixed oil (here, mixed oil refers to oil containing water or impurities), placing the second ball valve 631 and the third ball valve 641 at the bottom of the second flow meter 42 and positioning the first ball valve 621 higher than the second ball valve 631 and the third ball valve 641 makes it easier for water or impurities to drain from the second flow meter 42. During this process, when metering is required, the second controller 422 sends a control signal to the second solenoid valve 421 to open the second solenoid valve 421. At this time, the second flow meter 42 begins metering. When the second flow meter 42 reaches a preset capacity, it sends a feedback signal to the second controller 422, at which point the second controller 422 controls the second solenoid valve 421 to close, thus ending the metering process.

[0082] In some embodiments, the recovery tank 41 is equipped with a safety level line, which does not exceed half the height of the recovery tank 41. In this embodiment, the height of the recovery tank 41 is 8 meters, and the safety level line does not exceed half the height of the recovery tank 41, that is, it must not exceed 4 meters. In this embodiment, the safety level line is set at 3.5 meters, leaving more than half of the space to handle oil recovery in emergency situations. In some embodiments, the oil recovery quality inspection system 100 also includes multiple spare tanks 70 and a conveying pipeline 80. The spare tanks 70 are connected to the recovery tank 41 through the conveying pipeline 80. The conveying pipeline 80 is used to transport at least a portion of the oil in the recovery tank 41 to the spare tanks 70 for storage when the oil level in the recovery tank 41 exceeds the safety level line. In this embodiment, for example, when the oil level in the recovery tank 41 exceeds 3.5 meters, the recovered oil will be transported to an empty spare tank 70 for storage through the conveying pipeline 80. When reused, it needs to be tested again to see if it meets the standard. Only if it meets the standard can it be reused, thus achieving recycling and avoiding oil waste.

[0083] In some embodiments, the recovery pipeline 60 includes a fifth recovery pipeline 65 and a sixth recovery pipeline 66; the oil quality inspection unit 10 includes a first flow meter 11, which is connected to the oil storage tank 50 via the fifth recovery pipeline 65 and to the inlet end 22 via the sixth recovery pipeline 66. The first flow meter 11 is used to measure the amount of oil flowing out from the bottom of the oil storage tank 50. Since there is a distance between the first flow meter 11 (or sampler 13) and the oil storage tank 50 via the recovery pipeline 60, the first flow meter 11 needs to measure the amount of a portion of the oil at the bottom of the oil storage tank 50 (wherein, this portion of the oil includes the oil in the fifth recovery pipeline 65 connecting the first flow meter 11 and the oil storage tank 50) to discharge a portion of the oil to the first flow meter 11, so that the oil obtained by the subsequent sampler 13 is more representative. When metering is required, the controller 112 sends a control signal to the first solenoid valve 111 to open it. At this time, the first flow meter 11 begins metering. When the first flow meter 11 reaches the preset capacity, it sends a feedback signal to the first controller 112. The first controller 112 then controls the first solenoid valve 111 to close, thus ending the metering process. The preset capacity can be 70L-90L, preferably 80L. The first flow meter 11 measures the amount of oil flowing out from the bottom of the oil storage tank 50. When the outflow reaches the preset capacity, the first controller 112 controls the first solenoid valve 111 to close the inlet of the first flow meter 11. The amount of oil flowing out from the bottom of the oil storage tank 50 can be observed on the display 114 of the first flow meter 11, facilitating observation by staff. Simultaneously, staff can also observe the instantaneous value of the amount of oil flowing out from the bottom of the oil storage tank 50 on the display 114. Compared with related technologies, the first flow meter 11 can measure the amount of oil flowing out from the bottom of the oil storage tank 50 (including total amount and instantaneous flow rate), but does not require staff to observe it, avoids staff to directly face the oil, is beneficial to the health of staff, and does not cause pollution to the environment.

[0084] In this embodiment, the oil storage tank 50 is a conical bottom tank (e.g., Figure 1As shown in the diagram, by utilizing the static pressure generated by the conical-bottom tank and placing the fifth recovery pipeline 65 and the sixth recovery pipeline 66 on the same horizontal plane, it is easy to drain water and impurities from the bottom of the oil storage tank 50. Furthermore, since the entire system occupies a large area, placing the fifth recovery pipeline 65 and the sixth recovery pipeline 66 on the same horizontal plane reduces construction difficulty and thus lowers costs. In some embodiments, the fifth recovery pipeline 65 is equipped with a fourth ball valve 651 and a first automatic return valve 652. The fourth ball valve 651 is located downstream of the outlet of the oil storage tank 50. In some embodiments, the fourth ball valve 651 remains normally open. This configuration allows oil to be maintained in the fifth recovery pipeline 65. When testing is required, the first automatic return valve 652 is opened to allow the oil in the oil storage tank 50 to flow into the first flow meter 11. At this time, the pressure of the oil received by the first automatic return valve 652 is released slowly, rather than increasing instantaneously, thus protecting the first flow meter 11. In this embodiment, the oil storage tank 50 is a conical bottom tank, which generates strong static pressure. If the fourth ball valve 651 remains closed and only opens when testing is required, it will generate significant pressure, putting excessive pressure on the fifth recovery pipeline 65 and the first flow meter 11. Therefore, to avoid safety hazards, the fourth ball valve 651 is kept normally open to alleviate the static pressure at the bottom of the oil storage tank 50, thereby improving safety. In some embodiments, the first automatic return valve 652 is located upstream of the inlet of the first flow meter 11. The first automatic return valve 652 opens when testing is required. When the oil in the first flow meter 11 reaches a preset capacity, the first controller 112 controls the first solenoid valve to close, thereby closing the inlet of the first flow meter 11. This requires no operator intervention and is convenient and quick. In some embodiments, the sixth recovery pipeline 66 is equipped with a fifth ball valve 661, which is located downstream of the outlet of the first flow meter 11. Open the first flow meter 11 when it is necessary to discharge the oil. In order to prevent the oil remaining in the first flow meter 11 (such as oil of poor quality) from being discharged into the main pipeline 20, it can be opened before it is necessary to recycle and discharge, so as to avoid mixing with clean oil and avoid waste.

[0085] In some embodiments, the recovery pipeline 60 includes a seventh recovery pipeline 67 and an eighth recovery pipeline 68; the oil quality inspection unit 10 includes a sampler 13, which is connected to the fifth recovery pipeline 65 via the seventh recovery pipeline 67, and connected to the sixth recovery pipeline 66 via the eighth recovery pipeline 68. In this embodiment, the eighth recovery pipeline 68 is connected to the sixth recovery pipeline 66 and converges to the same point before being connected to the inlet end 22 of the main pipeline 20. This reduces the number of inlet ends 22 provided on the main pipeline 20. In addition, the eighth recovery pipeline 68 and the sixth recovery pipeline 66 are assembled at the same point, which facilitates assembly and maintenance. In some embodiments, the sampler 13 is provided with a quality inspection scale line (e.g., at four-fifths of the sampling area of ​​the sampler). When testing is required, the sampler 13 is filled to the quality inspection scale line and then observed. The main visual inspection is to check whether the oil contains free water, suspended water and solid impurities. If the water content cannot be determined by visual inspection, a water tester can be used to further check whether the oil contains water (a water tester must be used to check the water content of the oil for quality inspection of the currently used and standby tanks or for random quality inspection of the oil storage tanks).

[0086] In this embodiment, the oil storage tank 50 is a conical bottom tank (e.g., Figure 1 As shown, by utilizing the static pressure generated by the conical-bottom tank and placing the seventh recovery pipeline 67 and the eighth recovery pipeline 68 at the same horizontal level, the water and impurities at the bottom of the oil storage tank 50 can be easily discharged. Furthermore, since the entire system occupies a large area, placing the seventh recovery pipeline 67 and the eighth recovery pipeline 68 at the same horizontal level reduces construction difficulty and thus lowers costs. By ensuring that the positions of the seventh recovery pipeline 67 and the eighth recovery pipeline 68 are no higher than the positions of the fifth recovery pipeline 65 and the sixth recovery pipeline 66, more oil (containing water and impurities) at the bottom of the oil storage tank 50 is discharged to the sampler 13, making the sampler 13 more accurate in detecting whether the oil contains free water, suspended water, and solid impurities. In some embodiments, the seventh recovery pipeline 67 is equipped with a second automatic return valve 671, which is located upstream of the inlet of the sampler 13. The second automatic return valve 671 opens when testing is required and automatically closes when the oil in the sampler 13 reaches the quality inspection scale line, requiring no operator intervention and is convenient and quick.

[0087] During oil quality inspection, first check whether the fourth ball valve 651 is kept in the normally open state (under normal circumstances, the fourth ball valve 651 is kept in the normally open state; if the fourth ball valve 651 is closed, then open it). Then open the fifth ball valve 661 to ensure that the fifth recovery pipeline 65 and the sixth recovery pipeline 66 connected to the first flow meter 11 are connected, so as to ensure that the oil in the fifth recovery pipeline 65 and the sixth recovery pipeline 66 can flow out smoothly.

[0088] Further, the second automatic return valve 671 is opened to flush the sampler 13. Specifically, oil is discharged to the quality inspection mark (approximately four-fifths full on the closed-circuit sampler), then the second automatic return valve 671 is closed. Next, the ball valve (not shown) at the bottom of the sampler 13 outlet is opened to vent, and finally, the ball valve at the bottom of the sampler 13 outlet is closed. This step is used to flush the sampler 13 with the oil to be inspected, making the test results more accurate.

[0089] Furthermore, the first automatic return valve 652 is opened, and the first solenoid valve 111 is opened by the first controller 112, so that the first flow meter 11 begins metering. During this process, the amount of oil flowing out from the bottom of the oil storage tank 50 can be observed by looking at the display 114 of the first flow meter 11, eliminating the need for personnel to directly face the oil and avoiding harm to their health and environmental pollution. After the first flow meter 11 reaches the preset capacity (e.g., 70L-90L, preferably 80L), the first solenoid valve 111 is closed by the first controller 112, so that the first flow meter 11 ends metering, and then the first automatic return valve 652 is closed. Since the fifth recovery pipeline 65 connecting the first flow meter 11 and the oil storage tank 50 is a certain distance away, some oil needs to be discharged into the first flow meter 11. The function of the first flow meter 11 is to measure the amount of oil flowing out from the bottom of the oil storage tank 50. The oil sample here includes a portion of the oil in the fifth recovery pipeline 65 connecting the first flow meter 11 and the oil storage tank 50. This arrangement makes the results detected by the subsequent sampler 13 more accurate.

[0090] Further, open the second automatic return valve 671, discharge oil into the sampler up to the quality inspection mark (approximately four-fifths of the closed-loop sampling area), and then close the second automatic return valve 671. Afterward, visually inspect the oil for free water, suspended water, and solid impurities. If the water content cannot be determined visually, a water tester (not shown) can be used to further check the oil for moisture content (a water tester must be used to check the moisture content of the oil for quality inspections of currently used and standby tanks or random checks of storage tanks).

[0091] Further, open the fifth ball valve 661 and the ball valve at the bottom of the sampler 13 outlet, discharging the oil to the inlet 22 of the main pipeline 20. Then, it is recovered by the oil pump unit 30 into the oil recovery unit 40 (e.g., discharged into the first oil recovery unit 40a). It should be noted that, to ensure the smooth flow of the recovery pipeline 60 and the main pipeline 20, it must be confirmed that the valves connected to the oil recovery unit 40 are open before proceeding with this step; this will not be elaborated further here.

[0092] Furthermore, if the oil quality inspection fails to meet the requirements, after completing the above steps, close the fifth ball valve 661 and the ball valve at the bottom of the sampler 13 outlet. Repeat the above steps until the oil quality inspection meets the requirements. If the oil quality inspection meets the requirements, proceed to the next step.

[0093] Furthermore, upon completion of the operation, first close and lock the fifth ball valve 661 (while keeping the fourth ball valve 651 in the normally open position). Then open the first automatic return valve 652 to drain the fifth recovery line 65. And open the second automatic return valve 671 to drain the seventh recovery line 67. Afterwards, close the first automatic return valve 652, the second automatic return valve 671, the fifth ball valve 661, and the ball valve located at the bottom of the sampler outlet in sequence.

[0094] During oil recovery, the second controller 422 first controls the second solenoid valve 421 to open, causing the second flow meter 42 to begin metering. During this process, the amount of oil flowing from the bottom of the storage tank 50 is observed on the display 114 of the second flow meter 42. When the preset capacity is reached, the second controller 422 controls the second solenoid valve 421 to close, causing the second flow meter 42 to stop metering. Then, the oil in the second flow meter 42 is visually inspected. If it contains a small amount of water or impurities, the first ball valve 621 can be opened to allow the oil to flow into the inlet 22 of the main pipeline 20, and then be recovered by the oil pump unit 30 to the oil recovery unit (e.g., discharged into the first oil recovery unit 40a). The third ball valve 641 can be opened to discharge the oil at the bottom of the second flow meter 42 into the zero-level tank 45. If it contains a large amount of impurities or water, the second ball valve 631 can be opened to discharge the oil into the treatment tank 44 for oil-water separation. This setup allows for the treatment of oils of varying qualities in the treatment tank 44, the zero-level tank 45, and the first oil recovery unit 40a, preventing oil waste. Further, the above steps are repeated until a visual inspection reveals no significant amounts of water or impurities in the oil within the second flow meter 42. Then, the second automatic return valve 671 upstream of the sampler 13 inlet is opened again, and the oil is visually inspected for free water, suspended water, and solid impurities.

[0095] Furthermore, after the operation is completed, first close and lock the fifth ball valve 661 (while keeping the fourth ball valve 651, located downstream of the outlet of the oil storage tank 50, in the normally open state). Open the first automatic return valve 652 to drain the fifth recovery line 65. Open the second automatic return valve 671 to drain the seventh recovery line 67. Then close the first automatic return valve 652, the second automatic return valve 671, the fifth ball valve 661, and the ball valve located at the bottom of the sampler outlet, and also close the first ball valve 621, the second ball valve 631, and the third ball valve 641.

[0096] Furthermore, if the first flow meter 11 indicates that the oil in the storage tank 50 consistently contains a significant amount of water or impurities, bottom draining of the storage tank 50 can be performed. For example, oil truck unloading or bottom oil extraction cannot be performed simultaneously during bottom draining of the storage tank 50. Alternatively, if the storage tank 50 meets the required settling time after oil is introduced, or if the first flow meter 11 indicates that the oil quality consistently contains a significant amount of water and impurities, bottom draining of the storage tank can be performed. The settling time after oil is received in the storage tank 50 is: no less than 3 hours per meter of jet fuel. In special cases, for storage tanks 50 equipped with float-type suction pipes, the settling time for jet fuel should be no less than 8 hours. In some embodiments, the bottom draining operation of the oil storage tank 50 is performed on the second oil recovery unit 40b. Before the bottom draining operation, the oil quality of the recovery tank 41 of the second oil recovery unit 40b is checked. Then, the electric valve (not shown) is opened, followed by the sludge pipeline valve of the recovery tank 41 to be drained, and the bottom is drained into the recovery tank 41 by self-pressure. After the bottom draining is completed, the electric valve and the sludge pipeline valve of the bottom recovery tank 41 are closed, and then the oil quality of the draining tank is checked again according to the above procedure. This setup can effectively classify and process oils of different qualities for recycling and utilization.

[0097] The technical solutions disclosed in the various embodiments of this application can complement each other without causing conflict.

[0098] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An oil recycling quality inspection system, characterized in that, include: The main pipeline includes an export end and multiple import ends; Oil pump unit, wherein the inlet of the oil pump unit is connected to the outlet end; Multiple oil quality inspection units are used to connect to corresponding oil storage tanks and are distributed at intervals along the main pipeline. Each oil quality inspection unit includes a first flow meter and a sampler. The first flow meter and the sampler are connected in parallel between the outlet and the inlet of the oil storage tank. The first flow meter is used to measure the amount of oil flowing out from the bottom of the oil storage tank, and the sampler is used to sample and test the oil at the bottom of the oil storage tank. An oil recovery unit is provided, with its inlet connected to the outlet of the oil pump unit and its outlet connected to the inlet. The main pipeline is used to receive the oil flowing out of the oil quality inspection unit. The oil pump unit is used to transport the oil in the main pipeline to the oil recovery unit. The oil recovery unit is used to recover and store the oil. The oil recovery quality inspection system includes a first solenoid valve located at the inlet of the first flow meter. The first solenoid valve is used to control the opening or closing of the inlet of the first flow meter. The oil recovery unit includes a first oil recovery unit and a second oil recovery unit. The first oil recovery unit and the second oil recovery unit are connected in parallel between the outlet and the inlet of the oil pump unit. The quality of the oil recovered by the first oil recovery unit is higher than that of the oil recovered by the second oil recovery unit.

2. The oil recovery quality inspection system according to claim 1, characterized in that, The oil recovery quality inspection system includes a first controller electrically connected to the first solenoid valve and the first flow meter. The first controller is used to control the first solenoid valve to disconnect when the oil volume of the first flow meter reaches a preset capacity, so as to close the inlet of the first flow meter.

3. The oil recovery quality inspection system according to claim 1, characterized in that, The oil recovery and quality inspection system also includes a recovery pipeline, with the multiple oil quality inspection units spaced apart on both sides of the main pipeline and connected to the inlet end through the recovery pipeline.

4. The oil recovery quality inspection system according to claim 3, characterized in that, The main pipeline and the recycling pipeline are located on the same horizontal plane.

5. The oil recovery quality inspection system according to claim 1, characterized in that, The inlet of the oil pump unit is positioned lower than the outlet.

6. The oil recovery quality inspection system according to claim 1, characterized in that, The oil recovery and quality inspection system also includes a buffer pipeline, the inlet of which is connected to the outlet end, and the outlet of which is connected to the inlet of the oil pump unit. The inlet of the buffer pipeline is positioned lower than the outlet end.

7. The oil recovery quality inspection system according to claim 6, characterized in that, The buffer pipeline includes a first end connected to the outlet end and a second end connected to the inlet of the oil pump unit, wherein the second end is positioned lower than the first end.

8. The oil recovery quality inspection system according to claim 1, characterized in that, The oil recovery and quality inspection system also includes a buffer tank located at the outlet end. The buffer tank is positioned lower than the main pipeline, and the oil pump unit is located inside the buffer tank.

9. The oil recovery quality inspection system according to claim 3, characterized in that, The oil recovery unit includes a second flow meter and a recovery tank. The inlet of the recovery tank is connected to the outlet of the oil pump unit. The second flow meter is connected between the outlet and the inlet of the recovery tank. The second flow meter is used to measure the amount of oil at the bottom of the recovery tank. The recovery tank is used to recover and store the oil.

10. The oil recovery quality inspection system according to claim 9, characterized in that, The oil recovery quality inspection system includes a second solenoid valve located at the inlet of the second flow meter. The second solenoid valve is used to control the opening or closing of the inlet of the second flow meter.

11. The oil recovery quality inspection system according to claim 10, characterized in that, The oil recovery quality inspection system includes a second controller electrically connected to the second solenoid valve and the second flow meter. The second controller is used to control the second solenoid valve to de-energize when the oil volume of the second flow meter reaches a preset capacity, so as to close the inlet of the second flow meter.

12. The oil recovery quality inspection system according to claim 11, characterized in that, The recovery pipeline includes a first recovery pipeline and a second recovery pipeline. The recovery tank is connected to the outlet of the oil pump unit through the first recovery pipeline, and the second flow meter is connected to the inlet end through the second recovery pipeline.

13. The oil recovery quality inspection system according to claim 12, characterized in that, The recovery pipeline includes a third recovery pipeline and a fourth recovery pipeline. The second flow meter is connected to the treatment tank through the third recovery pipeline and to the zero-level tank through the fourth recovery pipeline. The mass of the oil stored in the treatment tank is higher than the mass of the oil stored in the zero-level tank.

14. The oil recovery quality inspection system according to claim 13, characterized in that, The recovery pipeline includes a fifth recovery pipeline and a sixth recovery pipeline; the first flow meter is connected to the oil storage tank through the fifth recovery pipeline, and the first flow meter is connected to the inlet end through the sixth recovery pipeline.

15. The oil recovery quality inspection system according to claim 14, characterized in that, The recovery pipeline includes a seventh recovery pipeline and an eighth recovery pipeline; the sampler is connected to the fifth recovery pipeline through the seventh recovery pipeline, and the sampler is connected to the sixth recovery pipeline through the eighth recovery pipeline.

16. An aviation fuel storage system, characterized in that, It includes multiple oil storage tanks and an oil recovery and quality inspection system as described in any one of claims 1 to 15, wherein multiple oil quality inspection units of the oil recovery and quality inspection system correspond to the multiple oil storage tanks.

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