Oil spill recovery device for oil delivery single point slip ring

Abstract

The utility model relates to offshore crude oil delivery technical field especially is involved in a kind of oil delivery single point slip ring oil spill recovery device, including the recovery tank of fixed installation in the rotating ring of the slip ring, recovery tank is connected with oil pipe and oil drain pipe, valve is all equipped on oil pipe and oil drain pipe;The rotating ring of the slip ring and the radial direction of the sealing surface of fixed ring are opened with the outside of dynamic seal, the inside position of bearing and have closed oil collection groove, oil collection groove is annular groove with the rotating ring center flow channel as center, rotating ring is equipped with the oil collection channel that oil collection groove is connected with outside, another end of oil collection channel connects the oil pipe of the utility model.

Description

Technical Field

[0001] This utility model relates to the field of marine crude oil export technology, and in particular to a single-point slip ring oil spill recovery device. Background Technology

[0002] Offshore platforms collect oil, gas, and water (collectively referred to as well flows) from subsea oil fields and transport them to the platform. These flows are typically then transported via subsea pipelines to an FPSO (Floating Production Storage and Offloading) unit for further processing. The processed crude oil is stored in the FPSO's tanks, awaiting loading and unloading by scheduled shuttle tankers for transport. Slip rings are the transfer devices connecting the FPSO to the subsea pipeline, commonly used in single-point mooring systems. While supporting the FPSO or tanker's buoyancy and rotation around the mooring point, slip rings facilitate the transfer of materials between the subsea pipeline and the vessel. Therefore, the proper functioning of slip rings plays a crucial role in the safe and stable development of oil and gas fields.

[0003] In single-point mooring systems, multiple traditional slip rings can be stacked, such as stacking electric slip rings or common slip rings on top of liquid slip rings, to achieve the transmission of well current, power, and communication between the seabed and the FPSO. However, stacking multiple slip rings results in a large overall weight and complex structure. For single-point mooring systems with only intermittent well current transmission requirements, only liquid slip rings, also known as liquid rotary joint slip rings, are needed. They are lightweight and simple in structure, and are therefore widely used in single-point mooring systems.

[0004] For example, Chinese invention patent application CN114179976A discloses a liquid slip ring for a single-point mooring system. This large-diameter liquid slip ring can transmit high-pressure fluid media and includes an inner ring, outer ring, top cover, inlet flange, outlet flange, base, drive flange, sealing system, bearing, bearing waterproof cover, bearing lubrication system, leakage collection box, and online monitoring system for slip ring operation. The inner ring, with a stepped frustum, is mounted on the base; the inner ring of the slewing bearing is mounted on the lowest frustum of the inner ring; the outer ring is mounted on the outer ring of the slewing bearing; the top cover is mounted on the inner ring; fluid medium channels are provided on the inner ring cylinder and the outer ring; the outer ring rotates around the inner ring under the action of the drive flange and with the aid of the slewing bearing; multiple seals ensure sealing effectiveness. Multiple large-diameter liquid slip rings are connected vertically to form a liquid slip ring assembly.

[0005] However, during use, the aforementioned traditional slip rings are prone to developing gaps at the sealing connection between the fixed ring and the rotating ring due to the axial, radial, and overturning loads caused by large waves and the irregular movement of oil tankers. This leads to frequent crude oil leakage during the rotation of the rotating ring. This results in several adverse effects: first, leaked crude oil overflows onto the sea surface and flows with the waves, causing significant pollution to the marine environment; second, the recovery and treatment of leaked crude oil at sea is difficult and costly due to weather conditions; and third, after a crude oil leak, the platform at the site contains a large number of electrical devices, which can easily trigger fires or explosions.

[0006] When crude oil leaks occur, existing slip rings only allow personnel to clean the oil with felt. There are no specific oil spill recovery measures in the current technology. Some of the oil is washed into the sea by rainwater, making subsequent treatment difficult.

[0007] In conclusion, while ensuring the normal operation of the slip ring, it is necessary to study a single-point slip ring oil overflow recovery device to reduce or avoid crude oil leakage from the sealing end face and prevent crude oil leakage from polluting seawater. Utility Model Content

[0008] The purpose of this invention is to provide a single-point slip ring oil overflow recovery device to solve the technical problem that crude oil leakage is easy to occur at the sealing end face of existing slip rings.

[0009] To achieve the above objectives, this utility model provides an oil overflow recovery device for a single-point slip ring, comprising a recovery tank fixedly installed on the rotating ring of the slip ring, the recovery tank being connected to an oil inlet pipe and an oil outlet pipe, both of which are equipped with valves; a closed oil collection groove is formed in the radial direction of the sealing surface between the rotating ring and the fixed ring of the slip ring, on the outer side of the dynamic seal and the inner side of the bearing, the oil collection groove being an annular groove centered on the central flow channel of the slip ring, and an oil collection channel is provided inside the rotating ring to connect the oil collection groove to the outside, the other end of the oil collection channel being connected to the oil inlet pipe.

[0010] Furthermore, the oil collection groove is an annular groove formed on the rotating ring.

[0011] Furthermore, a T-junction is connected to the bottom of the recovery tank, through which the recovery tank is connected to the oil inlet pipe and the oil drain pipe.

[0012] Furthermore, a main ball valve is provided on the main connecting pipeline connecting the recovery tank and the three-way valve, an oil inlet ball valve is provided on the oil inlet pipe, and an oil drain ball valve is provided on the oil drain pipe.

[0013] Furthermore, the recovery tank is equipped with a level gauge for monitoring the crude oil level inside the recovery tank.

[0014] Furthermore, a pressure monitor, which is a pressure gauge or a pressure sensor, is installed on the main connecting pipeline.

[0015] Furthermore, the single-point slip ring oil overflow recovery device also includes a rain cover fixedly installed on the rotating ring of the slip ring. The rain cover is a semi-enclosed box structure with a side opening. The recovery tank is fixedly installed on the side wall inside the rain cover by a U-shaped clamp. The bottom of the recovery tank is fixed by angle steel installed on the side wall inside the rain cover.

[0016] Furthermore, an elastic pad is provided between the angle steel and the recycling tank.

[0017] Furthermore, the outer wall surface of the top plate of the rain cover is provided with lifting lugs.

[0018] Furthermore, the bottom plate of the rain cover is provided with a longitudinally penetrating oil drain port, which is detachably connected with a threaded plug.

[0019] Beneficial effects: This utility model is a pioneering invention. It features an oil collection groove on the sealing surfaces of the rotating ring and the fixed ring. An oil collection channel connected to the pre-collected oil groove within the rotating ring connects the oil collection groove to an external inlet pipe, which in turn connects to the recovery tank. When the rotating ring and the fixed ring rotate relative to each other, causing the seal between them to fail, the crude oil leaking radially outward from the dynamic seal first enters the oil collection groove, then enters the inlet pipe through the oil collection channel, and finally enters the recovery tank through the inlet pipe. This firstly collects the leaked crude oil, preventing it from leaking outward. Once a certain amount of crude oil has been collected in the recovery tank, it can be transferred and utilized at any time through the drain pipe, according to actual needs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the application of the single-point slip ring oil overflow recovery device of this utility model. Figure 2 This is a schematic diagram of the single-point slip ring oil overflow recovery device of this utility model; Figure 3 The left view of the single-point slip ring oil overflow recovery device of this utility model is shown with the left side plate hidden.

[0021] The components include: 1. Oil inlet ball valve; 2. Tee; 3. Main ball valve; 4. Pressure gauge tee; 5. Main connecting pipe; 6. Pressure gauge branch pipe; 7. Oil drain ball valve; 8. Pressure gauge; 9. Recovery tank; 10. Level gauge; 11. U-shaped clamp; 12. Rubber gasket; 13. Main ball valve handle; 14. Plug; 15. Angle steel; 16. Bolt; 17. Lifting lug; 18. Rotating ring; 19. Fixed ring; 20. Bearing; 21. Dynamic seal; 22. Oil collection trough; 23. Oil collection channel; 24. Slip ring inlet; 25. Slip ring outlet. Detailed Implementation

[0022] To address the problems in the background technology, the core inventive concept of this utility model is to achieve the recovery and reuse of crude oil leaking from the sealing joint surface between the rotating ring and the fixed ring in the slip ring by setting up an oil collection channel and an oil inlet pipeline.

[0023] The present invention will be further described in detail below with reference to an embodiment of an oil spill recovery device with a single-point slip ring.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, the oil spill recovery device of this utility model includes a rain cover fixedly installed on the rotating ring of the slip ring. The rain cover is a semi-enclosed box structure with side openings. A lifting lug 17 is provided on the outer wall of the top plate of the rain cover, and a longitudinally penetrating oil drain port is provided on the bottom plate of the rain cover. The oil drain port is sealed by a plug 14 detachably connected to the oil drain port. Two L-shaped flat irons with bolt holes are welded to the side of the rotating ring body of the slip ring, serving as the fixing base for the rain cover. The rain cover is fixed to the L-shaped flat irons with bolts. When water accumulates at the bottom of the rain cover housing, the plug 14 is loosened to drain the accumulated water. The lifting lug 17 is used to attach lifting ropes during the overall disassembly or installation of the oil spill recovery device.

[0025] like Figure 2 and Figure 3 As shown, a recovery tank 9 for recovering leaked crude oil is fixedly installed inside the rain cover. The recovery tank 9 is fixedly installed on the side wall inside the rain cover by a U-shaped clamp 11. The bottom of the recovery tank 9 is supported and fixed by an angle steel 15 installed on the side wall inside the rain cover. An elastic pad is provided between the angle steel 15 and the recovery tank 9. In this embodiment, the elastic pad is a rubber pad 12. The rubber pad 12 is provided at the contact point between the recovery tank 9 and the U-shaped clamp 11 to increase the friction and prevent the recovery tank 9 from slipping relative to the angle steel 15 during the rotation of the rotating ring, which would cause the tank body of the recovery tank 9 to shift and affect the stability of the device or cause wear to the tank body of the recovery tank 9. By adding a semi-enclosed box-type rain cover around the recovery tank 9, water can be prevented from affecting the readings of the level gauge 10 and pressure gauge 8.

[0026] The bottom of the recovery tank 9 is connected to an oil inlet pipe and an oil drain pipe via a tee 2. A main ball valve 3 is installed on the main connecting pipe 5 connecting the recovery tank 9 and the tee 2. An oil inlet ball valve 1 is installed on the oil inlet pipe, and an oil drain ball valve 7 is installed on the oil drain pipe. A pressure monitor, specifically a pressure gauge 8, is installed on the main connecting pipe 5. A pressure gauge branch pipe 6 extends from the main connecting pipe 5 of the recovery tank 9, and the pressure gauge 8 is connected to the pressure gauge branch pipe 6 to monitor the pressure inside the recovery tank 9. A level gauge 10 is installed inside the recovery tank 9 to monitor the crude oil level. Figure 1As shown, a closed oil collecting groove 22 is formed radially on the sealing surfaces of the rotating ring 18 and the fixed ring 19 of the slip ring, outside the dynamic seal 21 and inside the bearing 20. The oil collecting groove 22 is an annular groove centered on the central flow channel of the slip ring. An oil collecting channel 23 is provided inside the rotating ring 18 to connect the oil collecting groove 22 to the outside. The other end of the oil collecting channel 23 is connected to the oil inlet pipe. By machining an annular oil collecting groove 22 on the lower end face of the rotating ring of the slip ring and connecting the oil collecting groove 22 to the oil inlet pipe through the oil collecting channel 23, the leaked oil is guided to the recovery tank 9, thereby realizing the recovery of leaked oil from the slip ring. During oil transportation, the upper fixed ring of the slip ring is connected to the oil tanker's oil hose via a flange. The oil tanker is moored at a single point and moves in a circular motion with that point. At this time, the upper structure of the slip ring rotates together with the single point. The sealing surface between the fixed ring and the rotating ring leaks crude oil due to the up-and-down shaking. The leaked crude oil accumulates in the oil collection tank 22 and flows into the recovery tank 9 through the oil collection tank 22, the oil collection channel 23, the oil inlet pipe, and the main connecting pipe 5. When the crude oil in the tank reaches 2 / 3 of the total volume, the crude oil in the tank is discharged into a temporary oil receiving bucket for recovery through the drain pipe.

[0027] The method of using the single-point slip ring oil overflow recovery device of this utility model is as follows. When the slip ring is working, the crude oil being transported flows sequentially through the slip ring inlet 24, the fixed ring 19, and the rotating ring 18, and then flows out through the slip ring outlet 25. At this time, the oil inlet ball valve 1 and the main ball valve 3 are open, the oil drain ball valve 7 is closed, and the inlet pipeline is unobstructed. If crude oil overflows from the sealing surface between the fixed ring and the rotating ring, the leaked crude oil will accumulate in the oil collection tank 22. As the crude oil accumulates, the crude oil overflowing in the oil collection tank 22 enters the oil inlet pipe through the oil collection channel 23, then enters the tee 2 through the oil inlet ball valve 1, and then enters the pressure gauge tee 4 through the main ball valve 3 and the main connecting pipeline 5. After diversion, one path of crude oil flows into the recovery tank 9 for storage through the main connecting pipeline 5, and the other path flows into the pressure gauge 8 through the pressure gauge branch pipe 6 to indicate the real-time inlet pressure. The crude oil level in the recovery tank 9 is displayed in real time by the level gauge 11. When the slip ring stops working, the oil inlet ball valve 1 closes, and the main ball valve 3 and the drain ball valve 7 open, at which point the outlet pipeline is unobstructed. After connecting the drain pipe at the end of the drain ball valve 7 to the temporary oil receiving tank, open the drain ball valve 7 to drain the crude oil in the recovery tank 9 to the oil receiving tank for recovery and transfer, and then close the drain ball valve 7.

[0028] In the above embodiments, the pressure monitor is a pressure gauge 8, while in other embodiments, the pressure monitor is a pressure sensor.

[0029] In the above embodiments, the oil inlet pipe and the oil drain pipe are connected to the recovery tank 9 through the tee 2 and the main connecting pipe 5. In other embodiments, the oil inlet pipe and the oil drain pipe are connected to the recovery tank 9 separately, and the tee 2 is not required.

[0030] In the above embodiments, the rain cover is a semi-enclosed box structure with side openings. In other embodiments, the bottom of the rain cover is not provided with a bottom plate, thus eliminating the need for a bottom plate and an oil drain port.

[0031] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different types of specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A single-point slip ring oil overflow recovery device for oil transportation, characterized in that: The system includes a recovery tank fixedly installed on the rotating ring of the slip ring. The recovery tank is connected to an oil inlet pipe and an oil outlet pipe, both of which are equipped with valves. A closed oil collection groove is formed on the radial direction of the sealing surface between the rotating ring and the fixed ring of the slip ring, on the outer side of the dynamic seal and the inner side of the bearing. The oil collection groove is an annular groove centered on the central flow channel of the slip ring. An oil collection channel is provided inside the rotating ring to connect the oil collection groove to the outside. The other end of the oil collection channel is connected to the oil inlet pipe.

2. The single-point slip ring oil overflow recovery device according to claim 1, characterized in that: The oil collection groove is an annular groove formed on the rotating ring.

3. The single-point slip ring oil overflow recovery device according to claim 1, characterized in that: The bottom of the recovery tank is connected to a T-junction, through which the recovery tank is connected to the oil inlet pipe and the oil drain pipe.

4. The single-point slip ring oil overflow recovery device according to claim 3, characterized in that: A main ball valve is provided on the main connecting pipeline connecting the recovery tank and the tee, an oil inlet ball valve is provided on the oil inlet pipe, and an oil drain ball valve is provided on the oil drain pipe.

5. The single-point slip ring oil overflow recovery device according to claim 1, characterized in that: The recovery tank is equipped with a level gauge for monitoring the crude oil level inside the tank.

6. The single-point slip ring oil overflow recovery device according to claim 4, characterized in that: A pressure monitor, which can be a pressure gauge or a pressure sensor, is installed on the main connecting pipeline.

7. The single-point slip ring oil overflow recovery device according to any one of claims 1 to 6, characterized in that: The single-point slip ring oil overflow recovery device also includes a rain cover fixedly installed on the rotating ring of the slip ring. The rain cover is a semi-enclosed box structure with a side opening. The recovery tank is fixedly installed on the side wall inside the rain cover by a U-shaped clamp. The bottom of the recovery tank is fixed by angle steel installed on the side wall inside the rain cover.

8. The single-point slip ring oil overflow recovery device according to claim 7, characterized in that: An elastic pad is provided between the angle steel and the recycling tank.

9. The single-point slip ring oil overflow recovery device according to claim 7, characterized in that: The rain cover has lifting lugs on the outer wall of its top plate.

10. The single-point slip ring oil overflow recovery device according to claim 7, characterized in that: The bottom plate of the rain cover is provided with a longitudinally penetrating oil drain port, which is detachably connected with a threaded plug.

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