A device and method for inducing jet flow pigging and synchronous vibration suppression power generation by using sea current

Abstract

The present application relates to a kind of device and method for inducing jet cleaning and synchronous vibration suppression power generation by ocean current, device is made of four groups of impeller driving module, four groups of transmission mechanism, four groups of power generation module, upper and lower two groups of jet module.Concrete is as follows: ocean current drives impeller rotation, drives piston periodic movement by transmission mechanism, and the axial jet of outside of device upper and lower end plate is formed, the effect of preventing and cleaning the organism adhered to the surface of marine riser is realized.The rotation of impeller, suction and injection of ocean current and the overall free rotation of device can disturb the shedding of vortex behind marine riser, so as to play the effect of inhibiting the vibration of marine riser;Impeller rotation drives the rotation of eccentric gear shaft with magnetic pole by transmission mechanism, so that current is generated in the surrounding conductive coil, synchronous vibration suppression and power generation are realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of ocean energy capture and vortex-induced vibration suppression device, and particularly relates to a device and method for inducing jet flow pigging and synchronous vibration suppression power generation by using ocean current. BACKGROUND

[0002] The development of economic society cannot be separated from the use of energy, China's sea area contains rich oil and gas resources, and the ocean contains huge ocean current energy, wave energy, tidal energy and other renewable resources, and vigorously developing ocean energy is the key to guarantee the high-speed development of social economy.

[0003] In the process of developing seabed oil and gas resources, the marine riser is a key device connecting the seabed wellhead and the sea surface oil and gas collection and processing facilities, but the marine riser serves in a complex marine physical environment, under the action of ocean current, alternating shedding vortices appear behind the marine riser, so that the marine riser bears periodic fluid forces, which triggers the vortex-induced vibration phenomenon of the marine riser, and in severe cases, the high-cycle fatigue failure of the marine riser occurs, causing significant economic losses and lasting damage to the marine environment. At the same time, marine organisms will attach to the surface of the riser during the long-term service of the riser, which not only increases the load of the riser, but also accelerates the corrosion failure of the riser. Therefore, developing a marine riser protection device is a key scientific problem for the safety of marine oil and gas exploitation.

[0004] Under the premise of guaranteeing the steady development of economy, it is urgent to vigorously develop renewable clean energy. If an additional device is added outside the marine riser, the device can not only protect the marine riser, but also convert the ocean current kinetic energy into electric energy, which will promote the green and efficient development of ocean energy. SUMMARY

[0005] To solve the problems proposed in the background art, the purpose of the present application is to provide a device and method for inducing jet flow pigging and synchronous vibration suppression power generation by using ocean current.

[0006] In order to achieve the above-mentioned purpose, the device of the present application adopts the following technical scheme:

[0007] A device for inducing jet flow pigging and synchronous vibration suppression power generation by using ocean current is composed of four groups of impeller driving modules, four groups of transmission mechanisms, four groups of power generation modules and two groups of jet flow modules. Each group of impeller driving modules includes an impeller, a large bevel gear, a small bevel gear, a gear box, a transmission shaft and an elliptical airfoil; each group of transmission mechanism includes a small gear, two eccentric gears, a power generation box and two connecting rods; each group of power generation module includes a power generation box, two gear shafts with magnetic poles and two groups of conductive coils; and each group of jet flow module includes a piston, twenty-seven one-way valves and an end plate.

[0008] The circular ring bearing is sleeved on the outer wall of the marine riser with an inner sleeve in between, the inner sleeve is a hollow cylindrical structure, and the inner sleeve is sleeved on the outer ring bearing so that the inner sleeve can rotate freely around the marine riser; four power generation boxes are installed on the outer wall of the inner sleeve at equal intervals, a transmission shaft and a pinion are inserted into the center of the outer side of each power generation box, the transmission shaft extends out of the outer sleeve through the outer sleeve wall, an oval wing is sleeved on the transmission shaft and coincides with the outer wall of the outer sleeve, and is exposed in the seawater, which protects the transmission shaft and supports the external impeller driving module; a gear box is installed on the outer side of the oval wing, an impeller rotating shaft is inserted into the gear box, a large bevel gear and a small bevel gear are installed on the impeller rotating shaft and the transmission shaft respectively, and the large bevel gear is engaged with the small bevel gear.

[0009] Two eccentric gears are installed on the outer side of each power generation box, the rotation of the eccentric gears drives the rotation of the gear shaft with magnetic poles on the surface, and the alternating magnetic field generates current in the surrounding conductive coil. The eccentric holes of the upper and lower eccentric gears are aligned, and the outer parts of the two eccentric gears are respectively connected to the upper and lower connecting rods, which are respectively hinged to the upper and lower pistons, so that the movement directions of the upper and lower pistons are consistent, but the working modes in the cavities are opposite. While the upper piston is sucking seawater, the lower cavity is in the mode of ejecting fluid. When the cavity is sucking seawater, the one-way valves installed on the inner wall of the outer sleeve are all in the open state, and the one-way valves installed on the upper and lower end plates are all in the closed state; conversely, when seawater is ejected outward, the one-way valves installed on the inner wall of the outer sleeve are all in the closed state, and the one-way valves installed on the upper and lower end plates are all in the open state.

[0010] The device for inducing jet flow and synchronous vibration suppression and power generation by using seawater provides a method for inducing jet flow and synchronous vibration suppression and power generation by using seawater. Under the action of seawater, the device can automatically rotate around the marine riser and interfere with the development of the surface boundary layer. Then, the seawater drives the impeller to rotate, and further drives the large bevel gear in the gear box to rotate. The large bevel gear in the gear box is engaged with the small bevel gear to realize the transmission of kinetic energy and the change of transmission direction. The small bevel gear drives one end of the transmission shaft in the oval wing to rotate, and the transmission shaft drives the pinion to rotate, and the pinion drives the upper and lower eccentric gears to rotate. The upper and lower eccentric gears drive the connecting rods to move, and the connecting rods drive the pistons to move periodically, suck the seawater boundary layer from the one-way valves on the inner wall of the outer sleeve, and periodically extrude the seawater from the one-way valves on the end plates to form axial jet flow. In addition, the rotation of the upper and lower eccentric gears drives the corresponding gear shafts in the power generation boxes to rotate.

[0011] Periodic suction of the one-way valve on the outer sleeve wall will interfere with the development of the boundary layer, the rotation of the impeller and the overall rotation of the device will also disturb the vortex shedding, and under the multiple disturbances, the vortex shedding behind the marine riser is inhibited, the fluid force acting on the marine riser is reduced, thereby playing a role in inhibiting the vibration of the marine riser, and the rotation of the impeller drives the eccentric gear shaft with magnetic poles to rotate to realize synchronous power generation; the periodic movement of the piston forms an axial jet on the device, and the effect of preventing and cleaning the biological attachment on the surface of the marine riser is realized.

[0012] The present application has the following advantages due to the use of the above technical scheme:

[0013] 1. The device can realize the rotational movement of the impeller and the overall structure under the action of the sea current, disturb the flow field near the marine riser, and at the same time, the two pistons above and below suck the fluid around the riser, reduce the fluid force, and realize the inhibition of vortex-induced vibration of the marine riser;

[0014] 2. The device can realize axial rotational jet of the riser to clean the marine biological attachment on the surface of the riser, so as to reduce the load of the riser and reduce the corrosion effect;

[0015] 3. The rotation of the impeller of the device drives the magnetic poles on the gear shaft to rotate through transmission, so that an electric current is generated in the surrounding conductive coil, realizing the conversion of sea current kinetic energy into electric energy, and fully utilizing the sea current energy. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic diagram of the device;

[0017] Figure 2 It is a rotating up and down jet structure schematic diagram of the device;

[0018] Figure 3 It is a power generation box structure schematic diagram of the device;

[0019] Figure 4 It is a rotating impeller structure schematic diagram of the device;

[0020] 1, marine riser; 2, circular ring bearing; 3, inner sleeve; 4, end plate; 5, one-way valve; 6, outer sleeve; 7, piston; 8, power generation box; 9, eccentric gear; 10, connecting rod; 11, transmission shaft; 12, small gear; 13, elliptical airfoil; 14, small bevel gear; 15, gear box; 16, large bevel gear; 17, impeller; 18, gear shaft; 19, magnetic pole; 20, conductive coil. DETAILED DESCRIPTION

[0021] The specific implementation of the present application will be further described below in combination with the drawings.

[0022] The device for inducing jet flow pigging and synchronous vibration suppression power generation by sea current comprises four groups of impeller driving modules, four groups of transmission mechanisms, four groups of power generation modules and two groups of jet flow modules. Each group of impeller driving module comprises an impeller, a large bevel gear, a small bevel gear, a gear box, a transmission shaft and an elliptical wing. Each group of transmission mechanism comprises a small gear, two eccentric gears, a power generation box and two connecting rods. Each group of power generation module comprises a power generation box, two gear shafts with magnetic poles and two groups of conductive coils. Each group of jet flow module comprises a piston, twenty-seven one-way valves and an end plate.

[0023] As shown in Figure 1 , 2 , the circular ring bearing 2 is sleeved on the outer wall of the marine riser 1 with an interval of the height of the inner sleeve 3. The inner sleeve 3 is a hollow cylindrical structure, and the inner sleeve 3 is sleeved outside the circular ring bearing 2, so that the inner sleeve 3 rotates freely around the marine riser 1 in the circumferential direction. Four power generation boxes 8 are installed on the outer wall of the inner sleeve 3 at equal intervals in the circumferential direction at the center height. Each power generation box 8 has a transmission shaft 11 and a small gear 12 inserted into the center of the outer side. The transmission shaft 11 penetrates the wall of the outer sleeve 6 and extends out of the outer sleeve 6. An elliptical wing 13 is sleeved on the transmission shaft 11 and coincides with the outer wall of the outer sleeve 6, which is exposed to seawater and protects the transmission shaft 11 and supports the external impeller driving module. The gear box 15 is installed on the outer side of the elliptical wing 13. The rotating shaft of the impeller 17 is inserted into the gear box 15. The large bevel gear 16 and the small bevel gear 12 are installed on the rotating shaft of the impeller 17 and the transmission shaft 11 respectively. The large bevel gear 16 is engaged with the small bevel gear 14.

[0024] As shown in Figure 3 , 4 , two eccentric gears 9 are installed on the outer side of each power generation box 8. The rotation of the eccentric gears 9 drives the rotation of the gear shaft 18 with magnetic poles 19 on the surface. The alternating magnetic field causes an electric current to flow in the conductive coil 20 arranged around. The eccentric holes of the upper and lower eccentric gears 9 are aligned. The outer parts of the two eccentric gears 9 are respectively connected to the upper and lower connecting rods 10. The connecting rods 10 are respectively hinged to the upper and lower pistons 7, so that the movement directions of the upper and lower pistons 7 are consistent, but the working modes in the cavities are opposite. When the upper piston 7 sucks the sea current, the lower cavity works in the mode of ejecting the fluid. When the sea current is sucked in the cavity, the one-way valves 5 installed on the inner wall of the outer sleeve 6 are all in the open state, and the one-way valves 5 installed on the upper and lower end plates 4 are all in the closed state. Conversely, when the sea current is ejected outward, the one-way valves 5 installed on the inner wall of the outer sleeve 6 are all in the closed state, and the one-way valves 5 installed on the upper and lower end plates 4 are all in the open state.

[0025] The device for inducing jet flow for pigging and synchronous vibration suppression and power generation by using sea current provides a method for inducing jet flow for pigging and synchronous vibration suppression and power generation by using sea current. Under the action of sea current, the device can rotate automatically around the marine riser 1, and interfere with the development of the surface boundary layer. Then, the sea current drives the impeller 17 to rotate, and further drives the large bevel gear 16 in the gear box 15 to rotate. The large bevel gear 16 in the gear box 15 meshes with the small bevel gear 12 to realize the transmission of kinetic energy and the change of transmission direction. The small bevel gear 12 drives one end of the transmission shaft 11 in the elliptical airfoil 13 to rotate, and the transmission shaft 11 drives the small bevel gear 12 to rotate. The small bevel gear 12 drives the upper and lower eccentric gears 9 to rotate. The upper and lower eccentric gears 9 drive the connecting rod 10 to move, and the connecting rod 10 drives the piston 7 to move periodically. The sea current boundary layer around the piston 7 is sucked into the one-way valve 5 on the inner wall of the outer sleeve 6, and is periodically extruded out of the one-way valve 5 on the end plate 4, forming an axial jet flow. In addition, the rotation of the upper and lower eccentric gears 9 drives the corresponding gear shafts 18 in the power generation box 8 to rotate.

[0026] The periodic suction of sea current by the one-way valve on the wall of the outer sleeve 6 will interfere with the development of the boundary layer, and the rotation of the impeller 17 and the overall rotation of the device will also disturb the vortex shedding. Under the multiple disturbances, the vortex shedding behind the marine riser 1 is inhibited, the fluid force acting on the marine riser 1 is reduced, and the effect of suppressing the vibration of the marine riser 1 is achieved. At the same time, the rotation of the impeller 17 drives the eccentric gears 9 and gear shafts 18 with magnetic poles 19 to rotate, realizing synchronous power generation. The periodic movement of the piston 7 forms axial jet flow on the device, achieving the effect of preventing and cleaning the biological attachments on the surface of the marine riser 1.

[0027] Embodiment:

[0028] When installing the device, first, two ring bearings 2 are fitted on the outer wall of the marine riser 1 with an interval of the height of the inner sleeve 3, and then the inner sleeve 3 is installed on the ring bearings 2. Next, an end plate 4 is installed at the lower part of the inner sleeve 3, and the lower end surface of the end plate 4 coincides with the lower end surface of the inner sleeve 3. Nine one-way valves 5 are installed on the lower end surface of the end plate 4, and the one-way valves are distributed equidistantly in the circumferential direction. An outer sleeve 6 is fitted on the end plate 4, and the lower end surface of the outer sleeve 6 coincides with the lower end surface of the end plate 4. Eighteen one-way valves are installed on the inner wall surface of the outer sleeve 6. A piston 7 is fitted between the inner sleeve 3 and the outer sleeve 6, and the hinge joint of the piston 7 faces upward, waiting to be hinged with the lower connecting rod 10. Then, four groups of power generation boxes 8 are symmetrically installed on the outer wall of the inner sleeve 3, and the installation height is at the central height of the inner sleeve 3. Four eccentric gears 9 are respectively installed on the gear shafts 18 at the lower side of the four groups of power generation boxes 8. One end of the four connecting rods 10 is hinged with the hinge joint of the lower piston 7, and the other end is respectively inserted into the eccentric holes of the four eccentric gears 9. Four transmission shafts 11 pass through the wall surface of the outer sleeve 6, and then small gears 12 are installed before being respectively inserted into the four groups of power generation boxes 8. Then, four eccentric gears 9 are respectively installed on the gear shafts 18 at the upper side of the four groups of power generation boxes 8, and the eccentric holes are aligned with the eccentric holes on the lower eccentric gears 9. One end of the four connecting rods 10 is respectively installed in the eccentric holes on the four upper eccentric gears 9. One piston 7 is fitted between the inner sleeve 3 and the outer sleeve 6, and the hinge joint faces downward and is hinged with one end of the four connecting rods 10. Eighteen one-way valves are installed on the inner wall surface of the outer sleeve 6 at the upper side. Then, one end plate 4 is fitted on the inner sleeve 3, and the upper end surface of the end plate 4 coincides with the upper end surface of the inner sleeve 3. Nine one-way valves are installed equidistantly in the circumferential direction on the upper end surface of the end plate 4.

[0029] Then, four elliptical wings 13 are respectively fitted on the transmission shafts 11, and the inner side coincides with the outer wall surface of the outer sleeve 6. Four gear boxes 15 are respectively installed on the outer side of the four elliptical wings 13, and the diameter of the bearing hole on one side of the gear box 15 is equal to that of the transmission shaft 11. Four small bevel gears are respectively put into the gear boxes 15 and installed on one end of the four transmission shafts 11. Finally, the central shafts of four impellers 17 are respectively inserted into the corresponding bearing holes of the four gear boxes 15, and four large bevel gears 16 are respectively put into the gear boxes 15 and installed on the four impeller shafts.

[0030] After installation, when the sea current impacts the marine riser 1 in any direction, the 4 sets of impellers 17 can rotate the device as a whole while interfering with the surrounding flow field, thereby inhibiting vortex-induced vibration of the marine riser 1; the rotation of the impellers 17 changes the transmission direction through bevel gears, drives the rotation of the transmission shaft 11, the rotation of the pinion 12 at the other end of the transmission shaft drives the rotation of the upper and lower 8 eccentric gears 9, the rotation of the eccentric gears 9 drives the rotation of the 8 gear shafts 18 respectively, so that the electric current is generated in the conductive coil 20, realizing power generation; the rotation of the eccentric gears 9 also drives the same direction movement of the 8 connecting rods 10 and the upper and lower two pistons 7 respectively, when the two pistons 7 move downward, the 18 one-way valves distributed on the upper side of the inner wall surface of the outer sleeve 6 open, the 9 one-way valves on the upper end surface of the upper end plate 4 close, the upper chamber sucks the sea current, the 18 one-way valves distributed on the lower side of the inner wall surface of the outer sleeve 6 close, the 9 one-way valves on the lower end surface of the lower end plate 4 open, the lower chamber sprays the sea current, realizing the axial jet cleaning of the biological attached to the surface of the marine riser 1; finally realizing the method of using the sea current to induce the jet cleaning and synchronous vibration suppression power generation.

Claims

1. A device for inducing jet flow pigging and synchronous vibration suppression power generation by sea current, which is composed of four groups of impeller driving modules, four groups of transmission mechanisms, four groups of power generation modules and two groups of jet flow modules. Each group of impeller driving modules comprises an impeller (17), a large bevel gear (16), a small bevel gear (14), a gear box (15), a transmission shaft (11) and an elliptical wing (13). Each group of transmission mechanisms comprises a pinion (12), two eccentric gears (9) and two connecting rods (10). Each group of power generation modules comprises a power generation box (8), two gear shafts (18) with magnetic poles (19) and two groups of conductive coils (20). Each group of jet flow modules comprises a piston (7), twenty-seven one-way valves (5) and an end plate (4). A circular ring bearing (2) is sleeved on the outer wall of an offshore riser (1) at a height interval of an inner sleeve (3). The inner sleeve (3) is a hollow cylindrical structure, and the inner sleeve (3) is sleeved outside the circular ring bearing (2) to allow the inner sleeve (3) to rotate freely around the offshore riser (1). Four power generation boxes (8) are installed equidistantly on the outer wall of the inner sleeve (3) at the center height. Each power generation box (8) has a transmission shaft (11) and a pinion (12) inserted at the center of the outer side. The transmission shaft (11) extends through the wall of an outer sleeve (6) and protrudes out of the outer sleeve (6). An elliptical wing (13) is sleeved on the transmission shaft (11) and exposed to seawater, which protects the transmission shaft (11) and supports the external impeller driving module. A gear box (15) is installed outside the elliptical wing (13), and the rotating shaft of the impeller (17) is inserted into the gear box (15). The large bevel gear (16) and the small bevel gear (14) are installed on the rotating shaft of the impeller (17) and the transmission shaft (11), respectively, and the large bevel gear (16) is engaged with the small bevel gear (14). Each power generation box (8) outside, the upper and lower installation of two eccentric gears (9), eccentric gear (9) rotation drive surface attached to the gear shaft (18) of the magnetic pole (19) rotation, magnetic field alternately change so that the surrounding conductive coil (20) in the current; The eccentric holes of the upper and lower two eccentric gears (9) are aligned, and the outer parts of the two eccentric gears (9) are respectively connected to the upper and lower two connecting rods (10), which are respectively hinged to the upper and lower pistons (7), so that the movement directions of the upper and lower pistons (7) are consistent, but the working modes in the chamber are opposite. The upper piston (7) sucks in the sea current at the same time, and the working mode of the lower chamber is to jet out the fluid; When the chamber sucks in the sea current, the one-way valve (5) installed on the inner wall of the outer sleeve (6) is fully open, and the one-way valve (5) installed on the upper and lower two side end plates (4) is fully closed; Conversely, when the sea current is jetted out, the one-way valve (5) installed on the inner wall of the outer sleeve (6) is fully closed, and the one-way valve (5) installed on the upper and lower two side end plates (4) is fully open.

2. A method for inducing jet flow pigging and synchronous vibration suppression power generation by sea current, using the device for inducing jet flow pigging and synchronous vibration suppression power generation by sea current according to claim 1, characterized in that: Under the action of the sea current, the device can automatically rotate around the marine riser (1), interfering with the development of the surface boundary layer; Then, the sea current drives the impeller (17) to rotate, and further drives the large bevel gear (16) in the gear box (15) to rotate. The large bevel gear (16) in the gear box (15) meshes with the small bevel gear (14) to realize the transmission of kinetic energy and the change of transmission direction. The small bevel gear (14) drives one end of the transmission shaft (11) in the elliptical wing (13) to rotate, and the transmission shaft (11) rotates to drive the small gear (12) to rotate. The small gear (12) drives the upper and lower two eccentric gears (9) to rotate; The upper and lower eccentric gears (9) drive the connecting rods (10) to move, and the connecting rods (10) drive the pistons (7) to move periodically, sucking the surrounding sea current boundary layer from the one-way valve (5) on the inner wall of the outer sleeve (6), and periodically extruding from the one-way valve (5) on the end plate (4), forming an axial jet; In addition, the rotation of the upper and lower two eccentric gears (9) drives the corresponding gear shafts (18) in the power generation box (8) to rotate; The periodic suction of the one-way valve on the inner wall of the outer sleeve (6) will interfere with the development of the boundary layer, and the rotation of the impeller (17) and the overall rotation of the device will also disturb the vortex shedding. Under the multiple disturbances, the vortex shedding behind the marine riser (1) is inhibited, the fluid force acting on the marine riser (1) is reduced, thereby achieving the effect of inhibiting the vibration of the marine riser (1), and at the same time, the rotation of the impeller (17) drives the eccentric gears (9) and the gear shafts (18) with magnetic poles (19) to rotate to realize synchronous power generation; The periodic movement of the pistons (7) forms an axial jet on the device, achieving the effect of preventing and cleaning the organisms attached to the surface of the marine riser (1).

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