Automatic tank cutting method for oil depot storage tank

Abstract

The invention belongs to the technical field of safe operation of oil storage tanks in oil depots, and particularly relates to an automatic tank cutting method for oil depot storage tanks, which comprises the following steps that: a worker needs to check hardware and software of each oil depot firstly to check whether the hardware and software meet the automatic tank cutting requirements of the oil depots, and a storage tank A and a storage tank B can be monitored in real time through an automatic liquid level instrument; in the production operation process, when the liquid level of the oil collecting tank is higher than the high alarm setting height and the liquid level of the oil emitting tank is lower than the low alarm height, the sound-light alarm device emits sound-light alarm; the timing oil receiving system automatically starts an oil depot storage tank oil receiving pipeline electric actuating mechanism, and the oil delivery operation system automatically starts an oil depot storage tank oil delivery pipeline electric actuating mechanism. Two functions of soft report and hard report are set in the system, when the storage tank is in production operation, one of any one of soft report and hard report can be triggered, the system can automatically complete the storage tank cutting operation, the two technical problems of roof fall prevention and evacuation prevention of the storage tank are fundamentally solved, and safe and stable operation of the oil depot storage tank is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of safe operation of oil storage tanks in oil depots, and in particular to an automatic tank cutting method for storage tanks in oil depots. Background Art

[0002] Companies that produce, operate, and store hazardous chemicals must comply with safety production laws, regulations, and standards. Tank roof collapse and evacuation are significant risks in oil depot operations. Once a tank roof collapse occurs, it not only results in oil product loss but can also potentially trigger fires, explosions, and environmental pollution, resulting in serious casualties and property damage, negatively impacting the storage company, even leading to devastating consequences. Tank evacuation is highly susceptible to cavitation, posing a significant risk to oil depot operations. Tank roof collapse and evacuation have become a key component of oil depot safety management and the daily oversight of safety production emergency management departments.

[0003] The existing technology has the following defects or problems:

[0004] 1. When the liquid level reaches the high-high level of the oil tank during the oil depot's oil collection process, the high-high level alarm will simultaneously interlock and close the tank inlet pipeline control valve. At this time, the system does not interlock the various oil pumps used to transport oil products. The oil tank inlet is closed, but the pumps continue to work and continue to transport oil products, often causing pressure buildup in the oil collection pipeline. While avoiding the risk of oil tank roof bursting, it also increases the many risks caused by pipeline pressure buildup (such as pipeline rupture, gasket damage, and oil pump damage). The consequences and losses caused by these risks are no less than those caused by tank roof bursting. Especially when transporting oil products into the warehouse through long-distance pipelines, accidents caused by pipeline pressure buildup will cause greater losses.

[0005] 2. When oil products are put into storage, if the electric inlet valve of the oil tank inlet pipeline is interlocked, the oil depot will suspend the oil collection operation, affecting the oil depot's work efficiency. Especially for oil depots that use pipeline transportation for storage, the oil depot and the transportation unit are often two different companies. The suspension and restart of pipeline transportation requires simultaneous contact and confirmation from multiple departments and companies, which increases the workload and greatly affects work efficiency.

[0006] 3. Storage tanks with a capacity of less than 50,000 cubic meters are subject to the risk of tank evacuation and frequent raising and lowering of the float. Furthermore, if tank evacuation and float lowering occur, not only will this increase the associated risks, but it will also affect the operational efficiency of the oil depot.

[0007] 4. In most oil product management and storage companies, the technical measures to prevent oil tank roof bursting and oil tank emptying during oil delivery only rely on operator monitoring. The comprehensive quality and sense of responsibility of the operators play a key role. The two major risks of oil tank roof bursting and emptying have not been fundamentally controlled.

[0008] It should be noted that the above content falls within the technical knowledge of the inventor and does not necessarily constitute prior art. Summary of the Invention

[0009] In view of the deficiencies in the prior art, the present invention provides an automatic tank cutting method for oil depot storage tanks, which solves the existing problems.

[0010] To achieve the above object, the present invention provides the following technical solution: a method for automatically cutting a storage tank in an oil depot, comprising the following steps:

[0011] Step 1: The staff must first check the hardware and software of each oil depot to see if they meet the technical requirements for automatic tank switching and ensure that the system is operating normally. When the tank switching conditions are triggered, the oil depot integrated management system can automatically switch tanks and set tanks A and B as receiving tanks and sending tanks respectively.

[0012] The hardware and software of each oil depot include automatic liquid level meter, electric actuator for electric valve of oil receiving pipeline of oil depot; electric actuator for oil discharge pipeline of oil depot; electric actuator for oil delivery pipeline of oil depot, electric actuator for electric valve at the root of oil depot, automatic control system of central control room, monitoring operation station in central control duty room and integrated management system of oil depot. In addition, oil receiving pipeline of oil depot, oil delivery pipeline of oil depot and oil discharge pipeline of oil depot are installed corresponding to each electric actuator.

[0013] Step 2: Control the activation of the soft interlock and hard interlock of the tank cutting, which are used to prevent roof cavitation and tank emptying during the process of oil loading and unloading. This fundamentally eliminates the risks of roof cavitation and tank emptying.

[0014] Step 3: Use the automatic liquid level meter to monitor tank A and tank B in real time;

[0015] Step 4: During the production operation, if the liquid level of the receiving oil tank is higher than the high alarm setting height, and the liquid level of the sending oil tank is lower than the low alarm height, the sound and light alarm device will sound an alarm;

[0016] Step 5: The timing oil receiving operation system automatically starts the electric actuator of the oil storage tank oil receiving pipeline, and the oil delivery operation system automatically starts the electric actuator of the oil storage tank oil delivery pipeline;

[0017] Step 6: The electric actuators of the oil receiving pipeline of the oil depot tank and the electric actuators of the oil delivery pipeline of the oil depot tank start to operate (the valves are fully open), and the system closes the electric actuators on the other side to realize the automatic tank cutting operation;

[0018] Step 7: If the liquid level of the receiving and sending oil tanks fails, the liquid level of the receiving tank reaches the high liquid level switch position of the external tuning fork switch of the storage tank and the low liquid level switch position of the external tuning fork switch of the storage tank, and the system executes the automatic tank cutting process by controlling the switch, thereby completing the tank cutting operation.

[0019] In some embodiments, the storage tank A and the storage tank B are different storage tanks for the same oil product, and the inlet lines, outlet lines, and tank guide pipelines of all storage tanks for the same oil product must be interconnected, and the inlet lines, outlet lines, and tank guide pipelines are independently set;

[0020] The hardware and software of each oil depot are equipped with a UPS 24-hour uninterruptible power supply, which adopts a redundant configuration. The switching between the uninterruptible power supplies adopts XX dual-circuit power switching device, and is also equipped with an automatic isolation stabilizer.

[0021] In some embodiments, the electric actuators of the electric valves of the oil receiving pipelines of the storage tanks; the electric actuators of the oil discharge pipelines of the oil depot storage tanks; the electric actuators of the oil delivery pipelines of the oil depot storage tanks, and the electric actuators of the electric valves at the root of the storage tanks all adopt a MODBUS ring network or a PROFIBUS / DP tree network, and are equipped with local, stop, remote, and switch selection operation keys, which can perform on-site and remote opening, closing, and stopping operations. The opening and closing data are stored in the automatic control system database of the central control room, and the operation records of the electric actuators can be queried on the server and the monitoring computer of the operation station;

[0022] A server is installed in the central control room to remotely monitor each electric actuator on site. The intelligent bus electric actuator has valve switching, switch feedback, over-torque feedback, automatic phase correction, phase loss alarm, motor overheat protection, and valve jam prevention protection. The electric valves involved in the operation steps and other automated equipment are automatically controlled and monitored by the PLC.

[0023] When each electric actuator is operating, in order to ensure safe operation, an operating system is adopted in which one person operates remotely in the central control room, one person reviews on site, and the on-duty leader goes to the central control room for confirmation. The valve switch stroke is displayed on the body of the actuator, and the switch position is expressed as a percentage. The open and closed states of the valve are marked with different colors on the computer of the monitoring operation station to facilitate monitoring by the monitoring personnel. When the electric valve is adjusted to the local site, the computer of the monitoring operation station cannot be remotely operated.

[0024] In some embodiments, the central control room automatic control system performs real-time monitoring of storage tanks A and B, specifically the liquid level, water level, temperature, and density. The data are first fed into an automatic level meter, which is then connected to the central control room automatic control system via a field bus.

[0025] The central control room's automatic control system is responsible for collecting liquid level, temperature, and pressure data, and simultaneously calculating density, volume, and mass in real time. The measurement data is shared within the central control room's automatic control system. Based on the calculation results, the status and inventory of a tank are detected in real time in the form of graphics and data, and are refreshed every 10 seconds.

[0026] If there are oil inflow and outflow operations, the inflow and outflow parameters can also be controlled. For moving tanks, the automatic liquid level meter provides key data for the system. When the liquid level reaches the system-set height, the system will issue an audible and visual alarm and automatically cut the tank in real time. For stationary tanks, when the liquid level changes greatly, it indicates that there may be oil crossflow or oil leakage. At this time, the automatic liquid level meter will transmit the information back to the system, and the system will also alarm. The automatic liquid level meter plays a role in real-time calculation and monitoring to display the tank storage information and the receiving, sending and transferring dynamics of the day.

[0027] In some embodiments, the high liquid level switch of the external tuning fork switch of the storage tank and the low liquid level switch of the external tuning fork switch of the storage tank together constitute a high and low liquid level detection device. The installation position of the high liquid level switch of the external tuning fork switch of the storage tank is slightly lower than the safety height of the storage tank. The oil intake volume for 15 minutes corresponds to the height of the storage tank. The low alarm position of the low liquid level switch of the external tuning fork switch of the storage tank should meet the low alarm position within 10-15 minutes from the start of the alarm. When the high and low liquid level detection device detects that the liquid level of the storage tank is higher than the high alarm position or lower than the low alarm position, the information is automatically transmitted to the automatic control system of the central control room to trigger the automatic tank cutting interlocking process of the oil depot tank, completing the automatic tank cutting process of the oil depot tank, and the high and low liquid level detection device detects the liquid level to complete the automatic tank cutting process of the oil depot tank.

[0028] In some embodiments, the central control room automatic control system is responsible for signal acquisition, data analysis, command issuance, command confirmation, and operation monitoring, performs information management according to the oil depot operation scheduling process, and connects with the superior information management system to automatically download operation tasks and upload various data and status during the operation;

[0029] The database used by the central control room automatic control system is separated from the databases used by other management systems. The external network can only access the databases of other management systems, but cannot access the database of the central control room automatic control system. At the same time, the system industrial control network is separated from the office network to ensure the network security of the control system database. The databases of other management systems are synchronized with the central control room automatic control system database in one direction to ensure the real-time and effectiveness of the data.

[0030] In some embodiments, the monitoring operation station in the central control duty room is manned by monitoring personnel 24 hours a day, and multiple groups of monitoring computers are set up to monitor different business units respectively, specifically the tank process flow, oil delivery process, automatic tank cutting and tank fire protection. The monitoring console set up in the monitoring operation station in the central control duty room can execute various instructions issued by the automatic control system of the operation center control room.

[0031] In some embodiments, the automatic liquid level meter can measure the total oil-water height, water height, oil density and oil temperature of the oil tank in real time, and transmit the measurement data to the automatic control system of the central control room, which can calculate the volume and weight of the oil stored in the tank. The monitoring personnel at the monitoring operation station in the central control duty room can monitor the computer of the monitoring operation station, and the computer of the monitoring operation station dynamically displays the liquid level height of the tank.

[0032] In some embodiments, the central control room automatic control system adopts a large-capacity dedicated server with redundant configuration, which can run continuously and reliably for a long time. The network is isolated from the external network by a hardware firewall. The CPU adopts redundant configuration, and the power module and communication module adopt 1:1 redundancy. It includes PLC, various controllers, server systems, operation stations, industrial Ethernet network equipment.

[0033] In some embodiments, the sound and light alarm device is installed in front of the monitoring personnel in the monitoring operation station in the central control duty room, which is convenient for the monitoring personnel to observe. When the system receives abnormal or fault information, the sound and light alarm will sound an sound and light alarm to prompt the monitoring personnel to perform manual intervention.

[0034] Compared with the prior art, the present invention provides an automatic tank cutting method for oil depot storage tanks, which has the following beneficial effects:

[0035] This method for automatically cutting tanks in oil depot storage tanks requires that both the tank hardware and software must have corresponding functions and meet corresponding requirements. The various electric actuators, automatic liquid level gauges, and external high and low level gauge liquid level detection devices installed in the oil depot storage tanks comply with national standards and specifications, and the software system meets production and operation requirements; when the system receives a signal from the liquid level gauge that the liquid level reaches the high or low alarm of the tank, the system issues an audible and visual alarm, prompting the on-duty personnel in the central control room to perform the corresponding operation. If the on-duty personnel still do not perform the operation, the system continues to alarm, and the audible and visual alarms change from weak to strong. When the liquid level reaches the high high alarm or the low low alarm, the system automatically starts the automatic tank cutting process to complete the storage tank receiving and dispatching operations and automatically cut the tank. If the automatic liquid level gauge of the storage tank fails, when the storage tank liquid level reaches the external high and low level gauge liquid level detection device, the system automatically starts the automatic tank cutting process to complete the storage tank receiving and dispatching operations and automatically cut the tank. The invention and application of this technology fundamentally eliminates the risks of oil tank roof collapse and evacuation, and greatly improves the safety management and control capabilities of the oil depot. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the connection status of the relevant structures of the automatic tank cutting method of the oil depot storage tank of the present invention.

[0037] The accompanying drawings are used to provide a further understanding of an automatic tank cutting technology for oil depot storage tanks and constitute a part of the specification. They illustrate that certain conditions must be met to achieve the automatic tank cutting technology for oil depot storage tanks and do not constitute a limitation to the patent of this invention. In the accompanying drawings:

[0038] In the figure: 1. Storage tank A; 2. Storage tank B; 3. Oil receiving pipeline of oil depot storage tank; 4. Oil delivery pipeline of oil depot storage tank; 5. Oil discharge pipeline of oil depot storage tank; 6. Electric actuator of oil receiving pipeline of storage tank; 7. Electric actuator of oil discharge pipeline of oil depot storage tank; 8. Electric actuator of oil delivery pipeline of oil depot storage tank; 9. Electric actuator of electric valve at the root of storage tank; 10. High liquid level switch of external tuning fork switch of storage tank; 11. Low liquid level switch of external tuning fork switch of storage tank; 12. Automatic liquid level meter; 13. Automatic control system of central control room; 14. Sound and light alarm device; 15. Monitoring and operation station in central control duty room; 16. Oil depot integrated management system. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] It should be understood that the step numbers used herein are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0041] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0042] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0043] The term "and / or" refers to and includes any and all possible combinations of one or more of the associated listed items.

[0044] See also Figure 1

[0045] Example 1: Automatic tank cutting during oil collection

[0046] Storage tank A1 and storage tank B2 are storage tanks of the same product name. Storage tank A1 is an oil collection tank, and storage tank B2 is a backup tank with a certain amount of empty capacity. The oil collection processes of the two storage tanks are interconnected.

[0047] The oil recovery process is turned on and the operator remotely turns on the electric actuator 6 of the oil recovery pipeline built into the tank A1 at the operation switch built into the monitoring operation station 16 in the central control room;

[0048] The operator went to the site to confirm whether the built-in electric actuator of tank A1 was fully opened, confirmed that the operation mode of the electric actuator was remote mode, and the electric actuator of the electric valve at the root of the tank was in the normally open position;

[0049] The operator confirmed that the electric actuators for the oil collection process of other tanks with the same product name as tank B2 were in remote status, and confirmed that the automatic tank cutting function of the oil depot tank was turned on;

[0050] Tank A1 begins filling with oil. The operator monitors the filling of tank A1 at the central control room monitoring station 16 and records the status of the operation every hour.

[0051] Tank A1 continues to receive oil. When the liquid level reaches the oil depot control height, the operator manually cuts the tank.

[0052] If the operator does not manually cut the tank, the liquid level continues to rise. When the liquid level reaches the high alarm position set by the storage tank A1 system, the central control room automatic control system 13 issues an audible and visual alarm instruction, and the audible and visual alarm device 14 issues an audible and visual alarm to prompt the operator to cut the tank;

[0053] The operator has not yet manually cut the tank, and the oil collection operation is still in progress in tank A1. The sound and light alarm device 14 continues to sound the sound and light alarm;

[0054] When the liquid level reaches the high-high alarm position of storage tank A1, the central control room automatic control system 20 starts the automatic tank cutting process, and the system automatically matches the storage tank B2 that meets the oil collection conditions;

[0055] The central control room automatic control system 20 issues a 120-second automatic can cutting countdown;

[0056] After the 120-second automatic tank cutting countdown ends, the central control room automatic control system 20 automatically opens the electric actuator of storage tank B2;

[0057] When the electric actuator of storage tank B2 is fully opened, the automatic control system 20 in the central control room automatically closes the electric actuator of storage tank A1. When the electric actuator is fully closed, the automatic tank cutting process is completed.

[0058] If an abnormality occurs in the automatic liquid level meter 12, the central control room automatic control system 13 does not detect the liquid level information sent back by the automatic liquid level meter 12. When the liquid level reaches the installation height of the high liquid level switch 10 of the external tuning fork switch of the storage tank, the central control room automatic control system 13 issues an automatic tank cutting operation instruction and starts the automatic tank cutting process until the tank cutting operation is completed.

[0059] Preferred embodiment 2: Automatic tank cutting during oil dispensing

[0060] Storage tank A1 and storage tank B2 are storage tanks of the same product name. Storage tank B2 is an oil delivery tank, and storage tank A1 is a backup tank. The oil delivery processes of the two storage tanks are interconnected.

[0061] The oil dispensing process is turned on and the operator remotely opens the electric actuator of the storage tank B2 at the monitoring operation station 15 in the central control duty room;

[0062] The operator went to the site to confirm whether the electric actuator of storage tank B2 was fully opened, confirmed that the operation mode of the electric actuator was remote mode, and confirmed that the electric actuator 9 of the electric valve at the root of the storage tank was in the normally open position;

[0063] The operator confirms that the electric actuator 8 of the oil distribution pipeline between the storage tank A1 and the oil distribution tank is in the remote state, and confirms that the automatic tank cutting function of the oil distribution tank is turned on;

[0064] Tank B2 begins discharging oil, and the operator monitors the discharging operation of Tank B2 at monitoring station 15 in the central control duty room;

[0065] Tank B2 continues to deliver oil. When the liquid level falls below the oil depot control height, operators manually cut the tank.

[0066] If the operator does not manually cut the tank, the liquid level continues to decrease. When the liquid level is lower than the low alarm position set by the storage tank B2 system, the central control room automatic control system 13 sends an audible and visual alarm instruction, and the audible and visual alarm device 14 sends an audible and visual alarm to prompt the operator to cut the tank;

[0067] The operator has not yet manually cut the tank, and the tank B2 is still in the oil delivery operation. The sound and light alarm device 14 continues to sound the sound and light alarm;

[0068] When the liquid level is lower than the low-low alarm position of storage tank B2, the central control room automatic control system 13 starts the automatic tank cutting process, and the system automatically matches the storage tank A1 that meets the oil delivery conditions;

[0069] The central control room automatic control system 13 issues a 120-second automatic can cutting countdown;

[0070] After the 120-second automatic tank cutting countdown ends, the central control room automatic control system 13 automatically opens the electric actuator of tank A1;

[0071] When the electric actuator of tank A1 is fully opened, the automatic control system 13 in the central control room automatically closes the electric actuator of tank B2. When the electric actuator is fully closed, the automatic tank cutting process is completed.

[0072] If an abnormality occurs in the automatic liquid level meter 12, the central control room automatic control system 13 does not detect the liquid level information sent back by the automatic liquid level meter 12. When the liquid level reaches the installation height of the high liquid level switch 10 of the external tuning fork switch of the storage tank, the central control room automatic control system 13 issues an automatic tank cutting operation instruction and starts the automatic tank cutting process until the tank cutting operation is completed.

[0073] To achieve the above, the hardware and software of each oil depot include an automatic liquid level meter 12, an electric actuator 6 for the electric valve of the oil receiving pipeline of the oil depot; an electric actuator 7 for the oil discharge pipeline of the oil depot; an electric actuator 8 for the oil delivery pipeline of the oil depot; an electric actuator 9 for the electric valve at the root of the oil depot; an automatic control system 13 in the central control room; a monitoring and operation station 15 in the central control duty room; and an integrated oil depot management system 16. Furthermore, corresponding to each electric actuator, an oil depot oil receiving pipeline 3, an oil depot oil delivery pipeline 4, and an oil depot oil discharge pipeline 5 are installed.

[0074] Storage tank A1 and storage tank B2 are different storage tanks for the same oil product. The inlet lines, outlet lines, and tank guide pipelines of all storage tanks for the same oil product must be interconnected and interoperable. The inlet lines, outlet lines, and tank guide pipelines must be set up independently.

[0075] Each oil depot's hardware and software are equipped with a 24-hour UPS (uninterruptible power supply) with redundant configuration. XX dual-circuit power switching devices are used for switching between UPSs, and automatic isolation voltage stabilizers are also configured.

[0076] The electric actuator 6 for the oil receiving pipeline of the storage tank; the electric actuator 7 for the oil discharge pipeline of the oil depot storage tank; the electric actuator 8 for the oil delivery pipeline of the oil depot storage tank, and the electric actuator 9 for the electric valve at the bottom of the storage tank all adopt a MODBUS ring network or a PROFIBUS / DP tree network, and have built-in local, stop, remote and switch selection operation keys, which can perform on-site and remote opening, closing and stopping operations. The opening and closing data are stored in the database of the automatic control system 13 in the central control room, and the operation records of the electric actuators can be queried on the server and the monitoring computer of the operation station;

[0077] The central control room is equipped with a server 13 to remotely monitor the various electric actuators on site. The intelligent bus electric actuators have valve opening and closing, opening and closing feedback, over-torque feedback, automatic phase correction, phase loss alarm, motor overheat protection, and valve jam prevention protection. The electric valves involved in the operation steps and other automated equipment are automatically controlled and monitored by the PLC.

[0078] When each electric actuator is in operation, in order to ensure safe operation, an operation system is adopted in which one person operates remotely in the central control room, one person reviews on site, and the on-duty leader confirms in the central control room. The valve switch stroke is displayed on the actuator body, and the switch position is expressed as a percentage. The open and closed states of the valve are marked with different colors on the computer at the monitoring station to facilitate monitoring by the monitoring personnel. When the electric valve is transferred to the local site, the computer at the monitoring station cannot be remotely operated.

[0079] The central control room automatic control system 13 monitors the storage tanks A1 and B2 in real time, specifically the liquid level, water level, temperature, and density. The data is first fed into the automatic level meter 12, which is then connected to the central control room automatic control system 13 via the field bus.

[0080] The central control room automatic control system 13 is responsible for collecting data on liquid level, temperature, and pressure, and calculating density, volume, and mass in real time. The measurement data is shared within the central control room automatic control system 13. Based on the calculation results, the status and inventory of a certain tank are detected in real time in the form of graphics and data, and are refreshed every 10 seconds.

[0081] If there are oil inflow and outflow operations, the inflow and outflow parameters can also be controlled. For moving tanks, the automatic liquid level meter provides key data for the system. When the liquid level reaches the system-set height, the system issues an audible and visual alarm and automatically cuts the tank in real time. For stationary tanks, when the liquid level fluctuates greatly, it indicates that there may be oil channeling or leakage. At this time, the automatic liquid level meter 12 transmits the information back to the system, and the system also issues an alarm. The automatic liquid level meter 12 calculates and monitors the tank inventory information and the oil receiving, sending and transfer dynamics of the day in real time.

[0082] The high liquid level switch 10 of the external tuning fork switch of the storage tank and the low liquid level switch 11 of the external tuning fork switch of the storage tank together constitute a high and low liquid level detection device. The installation position of the high liquid level switch 10 of the external tuning fork switch of the storage tank is slightly lower than the safety height of the storage tank. The oil intake volume of 15 minutes corresponds to the height of the storage tank. The low alarm position of the low liquid level switch 11 of the external tuning fork switch of the storage tank should meet the low alarm position within 10-15 minutes from the start of the alarm. When the high and low liquid level detection device detects that the liquid level of the storage tank is higher than the high alarm position or lower than the low alarm position, the information is automatically transmitted to the automatic control system of the central control room. The automatic control PLC system triggers the automatic tank cutting interlocking process of the oil depot tank to complete the automatic tank cutting process. The high and low liquid level detection device detects the liquid level and completes the automatic tank cutting process of the oil depot tank.

[0083] The central control room automatic control system 13 is responsible for signal acquisition, data analysis, command issuance, command confirmation, and operation monitoring. It performs information management according to the oil depot operation scheduling process and connects with the superior information management system to automatically download operation tasks and upload various data and status during the operation.

[0084] The database used by the central control room automatic control system 13 is separated from the databases used by other management systems. External networks can only access the databases of other management systems, but cannot access the database of the central control room automatic control system 13. At the same time, the system industrial control network is separated from the office network to ensure the network security of the control system database. The databases of other management systems are synchronized with the database of the central control room automatic control system 13 in one direction to ensure the real-time and validity of the data.

[0085] The monitoring and operation station 15 in the central control duty room is staffed 24 hours a day by monitoring personnel. It is equipped with multiple monitoring computers to monitor different business units, specifically the storage tank process flow, oil delivery process, automatic tank cutting, and storage tank fire protection. The monitoring console installed in the monitoring and operation station 15 in the central control duty room can execute various instructions issued by the automatic control system 13 in the operation center control room;

[0086] The automatic liquid level meter 12 can measure the total oil-water height, water height, oil density and oil temperature of the oil tank in real time, and transmit the measured data to the automatic control system 13 in the central control room, which can calculate the volume and weight of the oil stored in the tank. The monitoring personnel at the monitoring operation station 15 in the central control duty room can monitor the operation on the computer of the monitoring operation station, and the computer of the monitoring operation station dynamically displays the liquid level of the tank;

[0087] The central control room automatic control system 13 automatic control PLC system uses a large-capacity dedicated server with redundant configuration, which can run continuously and reliably for a long time. The network is isolated from the external network by a hardware firewall. The CPU adopts redundant configuration, and the power module and communication module adopt 1:1 redundancy. It includes PLC, various controllers, server systems, operation stations, and industrial Ethernet network equipment.

[0088] The sound and light alarm device 14 is installed in front of the monitoring personnel in the monitoring operation station 15 in the central control duty room, which is convenient for the monitoring personnel to observe. When the system receives abnormal or fault information, the sound and light alarm will sound an sound and light alarm to prompt the monitoring personnel to perform manual intervention.

[0089] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are described briefly because they are generally similar to the method embodiments. For relevant parts, refer to the description of the method embodiments.

[0090] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An automatic tank cutting method for oil depot storage tanks, characterized in that: The steps include: Step 1: The staff needs to first check the hardware and software of each oil depot to check whether they meet the technical requirements of the automatic tank cutting system of the oil depot and ensure that the system operates normally. When the tank cutting condition is triggered, the oil depot integrated management system (16) can automatically cut the tank and set the storage tank A (1) and storage tank B (2) as the receiving tank and the sending tank respectively; The hardware and software of each oil depot include an automatic liquid level meter (12), an electric actuator for the oil receiving pipeline of the oil depot (6); an electric actuator for the oil discharging pipeline of the oil depot (7); an electric actuator for the oil discharging pipeline of the oil depot (8), an electric actuator for the electric valve at the root of the oil depot (9), an automatic control system of the central control room (13), a monitoring operation station in the central control duty room (15) and an integrated management system of the oil depot (16), and an oil depot oil receiving pipeline (3), an oil depot oil discharging pipeline (4) and an oil depot oil discharging pipeline (5) are installed corresponding to each electric actuator. Step 2: Control the activation of the soft interlock and hard interlock of the tank cutting, which are used to prevent roof cavitation and tank emptying during the process of oil loading and unloading. This fundamentally eliminates the risks of roof cavitation and tank emptying. Step 3: The automatic liquid level meter (12) can monitor the storage tank A (1) and the storage tank B (2) in real time; Step 4: During the production operation, the liquid level of the receiving oil tank is higher than the high alarm setting height, and the liquid level of the sending oil tank is lower than the low alarm height, and the sound and light alarm device (14) emits a sound and light alarm; Step 5: When the timing ends, the oil receiving operation system automatically starts the electric actuator (6) of the oil storage tank oil receiving pipeline, and the oil delivery operation system automatically starts the electric actuator (8) of the oil storage tank oil delivery pipeline; Step 6: The electric actuator (6) of the oil receiving pipeline of the oil depot tank and the electric actuator (8) of the oil sending pipeline of the oil depot tank start to operate, and the system closes the electric actuators on the other side, thereby realizing the automatic tank cutting operation; Step 7: If the liquid level of the receiving and sending oil tanks fails, the liquid level of the receiving oil tank reaches the position of the high liquid level switch (10) of the external tuning fork switch of the storage tank and the position of the low liquid level switch (11) of the external tuning fork switch of the storage tank, and the system executes the automatic tank cutting process by controlling the switch, thereby completing the tank cutting operation.

2. The automatic tank cutting method of an oil depot storage tank according to claim 1 is characterized in that: The storage tank A (1) and storage tank B (2) are different storage tanks for the same oil product, and the inlet lines, outlet lines, and tank guide pipelines of all storage tanks for the same oil product must be interconnected, and the inlet lines, outlet lines, and tank guide pipelines are independently set; The hardware and software of each oil depot are equipped with a UPS 24-hour uninterruptible power supply, which adopts a redundant configuration. The switching between the uninterruptible power supplies adopts XX dual-circuit power switching device, and is also equipped with an automatic isolation stabilizer.

3. The automatic tank cutting method of an oil depot storage tank according to claim 1 is characterized in that: The electric actuator (6) of the oil receiving pipeline of the oil storage tank; the electric actuator (7) of the oil discharge pipeline of the oil storage tank; the electric actuator (8) of the oil delivery pipeline of the oil storage tank; and the electric actuator (9) of the electric valve at the root of the oil storage tank all adopt a MODBUS ring network or a PROFIBUS / DP tree network, and are equipped with local, stop, remote and switch selection operation keys, and can perform on-site and remote opening, closing and stopping operations. The opening and closing data are stored in the database of the automatic control system (13) in the central control room, and the operation records of the electric actuators can be queried on the server and the monitoring computer of the operation station; The central control room is equipped with a server (13) to remotely monitor the various electric actuators on site. The intelligent bus electric actuators have valve switching, switch feedback, over-torque feedback, automatic phase correction, phase loss alarm, motor overheat protection, and valve jam prevention protection functions. The electric valves involved in the operation steps are automatically controlled and monitored by the PLC. When each electric actuator is operating, in order to ensure safe operation, an operating system is adopted in which one person operates remotely in the central control room, one person reviews on site, and the on-duty leader goes to the central control room for confirmation. The valve switch stroke is displayed on the body of the actuator, and the switch position is expressed as a percentage. The open and closed states of the valve are marked with different colors on the computer of the monitoring operation station to facilitate monitoring by the monitoring personnel. When the electric valve is adjusted to the local site, the computer of the monitoring operation station cannot be remotely operated.

4. The automatic tank cutting method of an oil depot storage tank according to claim 1 is characterized in that: The central control room automatic control system (13) performs real-time monitoring of the storage tank A (1) and the storage tank B (2), specifically the liquid level, water level, temperature and density. At the same time, each data is first sent to the automatic liquid level meter (12), and the automatic liquid level meter (12) field bus is connected to the central control room automatic control system (13); The central control room automatic control system (13) is responsible for collecting data on liquid level, temperature, and pressure, and calculating density, volume, and mass in real time. The measurement data is shared within the central control room automatic control system (13). Based on the calculation results, the status and inventory of a certain storage tank are detected in real time in the form of graphics and data, and are refreshed every 10 seconds. If there are oil inflow and outflow operations, the inflow and outflow parameters can also be controlled. For moving tanks, the automatic liquid level meter (12) provides key data for the system. When the liquid level reaches the system set height, the system issues an audible and visual alarm and automatically cuts the tank in real time. For stationary tanks, when the liquid level changes greatly, it indicates that there may be oil leakage. At this time, the automatic liquid level meter (12) transmits the information back to the system, and the system will also alarm. The automatic liquid level meter (12) plays a role in real-time calculation and monitoring of the oil tank storage information and the dynamics of receiving, sending and transferring oil on that day.

5. The automatic tank cutting method of an oil depot storage tank according to claim 1 is characterized in that: The high liquid level switch (10) of the external tuning fork switch of the storage tank and the low liquid level switch (11) of the external tuning fork switch of the storage tank together constitute a high and low liquid level detection device. The installation position of the high liquid level switch (10) of the external tuning fork switch of the storage tank is slightly lower than the safety height of the storage tank. The oil intake volume of 15 minutes corresponds to the height of the storage tank. The low alarm position of the low liquid level switch (11) of the external tuning fork switch of the storage tank should meet the low alarm position within 10-15 minutes from the start of the alarm. When the high and low liquid level detection device detects that the liquid level of the storage tank is higher than the high alarm position or lower than the low alarm position, the information is automatically transmitted to the automatic control system (13) of the central control room to trigger the automatic tank cutting interlocking process of the oil depot storage tank, and the automatic tank cutting process of the oil depot storage tank is completed. The high and low liquid level detection device detects the liquid level and completes the automatic tank cutting process of the oil depot storage tank.

6. The automatic tank cutting method of an oil depot storage tank according to claim 1, characterized in that: The central control room automatic control system (13) is responsible for signal acquisition, data analysis, command issuance, command confirmation and operation monitoring, and performs information management according to the oil depot operation scheduling process, and connects with the superior information management system to automatically download operation tasks and upload various data and status during the operation; The database used by the central control room automatic control system (13) is separated from the databases used by other management systems. The external network can only access the databases of other management systems but cannot access the database of the central control room automatic control system (13). At the same time, the system industrial control network is separated from the office network to ensure the network security of the control system database. The databases of other management systems are synchronized with the database of the central control room automatic control system (13) in one direction to ensure the real-time and effectiveness of the data.

7. The automatic tank cutting method of an oil depot storage tank according to claim 1 is characterized in that: The monitoring operation station (15) in the central control duty room is manned by monitoring personnel 24 hours a day, and is equipped with multiple groups of monitoring computers to monitor different business units, specifically the storage tank process flow, oil delivery process, automatic tank cutting and storage tank fire protection. The monitoring operation console set in the monitoring operation station (15) in the central control duty room can execute various instructions issued by the automatic control system (13) of the operation center control room.

8. The automatic tank cutting method of an oil depot storage tank according to claim 1, characterized in that: The automatic liquid level meter (12) can measure the total oil-water height, water height, oil density and oil temperature of the oil tank in real time, and transmit the measured data to the automatic control system (13) in the central control room, and can calculate the volume and weight of the oil stored in the tank. The monitoring personnel at the monitoring operation station (15) in the central control duty room can monitor the computer of the monitoring operation station, and the computer of the monitoring operation station dynamically displays the liquid level height of the tank.

9. The automatic tank cutting method of an oil depot storage tank according to claim 1, characterized in that: The central control room automatic control system (13) adopts a large-capacity dedicated server with redundant configuration, can operate continuously and reliably for a long time, the network is isolated from the external network by a hardware firewall, the CPU adopts redundant configuration, the power module and the communication module adopt 1:1 redundancy, and it includes PLC, various controllers, server systems, operation stations, and industrial Ethernet network equipment.

10. The automatic tank cutting method of an oil depot storage tank according to claim 1, characterized in that: The sound and light alarm device (14) is installed in front of the monitoring personnel in the monitoring operation station (15) in the central control duty room, which is convenient for the monitoring personnel to observe. When the system receives abnormal or fault information, the sound and light alarm emits a sound and light alarm to prompt the monitoring personnel to perform manual intervention.

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