CN118148878A - Sea wave-driven compressed air energy storage system constrained by platform - Google Patents
Sea wave-driven compressed air energy storage system constrained by platform Download PDFInfo
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- CN118148878A CN118148878A CN202410095233.8A CN202410095233A CN118148878A CN 118148878 A CN118148878 A CN 118148878A CN 202410095233 A CN202410095233 A CN 202410095233A CN 118148878 A CN118148878 A CN 118148878A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 28
- 238000007667 floating Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010248 power generation Methods 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000007906 compression Methods 0.000 claims description 37
- 230000006835 compression Effects 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 8
- 238000013016 damping Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
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- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
A platform constrained sea wave driven compressed air energy storage system comprising: the marine floating hydraulic mechanism, the non return reversing mechanism, the compressed air cylinder group, the compressed air storage tank, the expansion motor and the generator that link to each other in proper order, wherein: the offshore floating hydraulic mechanism mainly generates heave degree of freedom motion under the action of sea waves, the generator is arranged at a fixed distance from the semi-submersible platform deck in the vertical and horizontal directions and is higher than the sea level, and the expansion motor is arranged above the sea level. The hydraulic power generation device integrates a hydraulic power acquisition technology component and a compressed air energy storage technology based on a liquid piston, converts wave energy into compressed air and stores the compressed air, the hydraulic damping effect in the running process is continuously enhanced, and the system has no natural frequency in the running process, so that the motion of the ocean wave energy power generation device under the action of ocean waves is greatly reduced, and the service life of equipment is remarkably prolonged.
Description
Technical Field
The invention relates to a technology in the field of offshore wave energy power generation, in particular to a platform-constrained sea wave-driven compressed air energy storage system.
Background
The main disadvantage of ocean wave energy is that the intermittence and availability often do not coincide with the power demand, that is to say the intermittence of ocean waves results in an mismatch of energy supply and demand. Energy storage systems are therefore critical for the utilization of wave energy. The energy storage system may provide stable and predictable electrical energy by storing excess energy and releasing it when demand is greater than supply. Compressed air energy storage is the use of compressed air to store energy for later use when needed. The surplus energy generated by renewable energy sources of ocean wave energy can be stored by this technology.
Disclosure of Invention
Aiming at the defect of high fluctuation of power output of a power acquisition system in waves caused by the intermittence of the waves in the prior art, the invention provides a platform-constrained sea wave-driven compressed air energy storage system, which integrates a hydraulic power acquisition technology-based component and a liquid piston-based compressed air energy storage technology, and converts wave energy into compressed air and stores the compressed air; through the compressed air energy storage technology of the liquid piston, the liquid piston is simple in principle, low in cost and high in working efficiency, almost no maintenance cost is needed, the hydraulic damping effect in the operation process is continuously enhanced, and the system has no natural frequency in the operation process, so that the motion of the ocean wave energy power generation device under the action of ocean waves is greatly reduced, and the service life of equipment is remarkably prolonged.
The invention is realized by the following technical scheme:
The invention relates to a platform-constrained sea wave-driven compressed air energy storage system, comprising: the marine floating hydraulic mechanism, the non return reversing mechanism, the compressed air cylinder group, the compressed air storage tank, the expansion motor and the generator that link to each other in proper order, wherein: the offshore floating hydraulic mechanism mainly generates heave degree of freedom motion under the action of sea waves, the generator is arranged at a fixed distance from the semi-submersible platform deck in the vertical and horizontal directions and is higher than the sea level, and the expansion motor is arranged above the sea level.
The marine floating hydraulic mechanism comprises: semi-submerged platform and set up buoyant raft, piston and pneumatic cylinder on it, wherein: the floating raft is connected with the piston, and the output end of the hydraulic cylinder is connected with the non-return reversing mechanism.
The outside of pneumatic cylinder be equipped with the enhancement vaulting pole.
The semi-submersible platform comprises: the semi-submersible platform deck and the toggle plates and the platform upright posts are respectively arranged on the upper side and the lower side of the semi-submersible platform deck.
The bottom of the semi-submersible platform deck is further provided with a pontoon, an anchoring rope and an anchor at the bottom of the platform.
The non-return reversing mechanism comprises: a check pipeline formed by a one-way valve and a four-way reversing valve connected with the check pipeline, wherein: the two input ends of the check pipeline are respectively connected with the inner output end and the outer output end of the hydraulic cylinder, and the output end of the four-way reversing valve is connected with the compression cylinder group.
When a wind wave is raised on the sea surface, the floating raft can generate heave oscillation motion under the action of the sea wave, but the floating raft only generates motion in heave degrees of freedom due to the restraining action of the semi-submersible platform. The upward heave motion of the raft will push the piston upwards, which pushes the water in the hydraulic cylinder out and through the non-return line. The check pipeline has the function of ensuring that the water does not flow back reversely in the process.
The compression cylinder group comprises two compression cylinders which are connected in parallel, air and water are filled in the compression cylinders, the bottoms of the compression cylinders are connected with the non-return reversing mechanism, and the tops of the compression cylinders are connected with the compressed air storage tank.
And a cooler is arranged between the compressed air cylinder group and the compressed air storage tank.
Technical effects
The invention is based on the compressed air energy storage technology of the liquid piston, the principle of the liquid piston is simple, compared with the prior art, the hydraulic damping effect of the liquid piston in the running process is continuously enhanced, and the system has no natural frequency in the running process. But as wave frequencies increase, so does the capture coefficient and stored power of the system.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
In the figure: the hydraulic system comprises one-way valves 1-8, a floating raft 9, a piston 10, hydraulic cylinders 11, anchors 12, mooring ropes 13, platform columns 14, toggle plates 15, a platform bottom buoy 16, a semi-submersible platform deck 17, reinforcing stay bars 18, pipelines 19-22, four-way reversing valves 23, pipelines 24, pipelines 25, a first compression cylinder 26, a second compression cylinder 27, pipelines 28-30, a cooler 31, pipelines 32, 33, a compressed air storage tank 34, an expansion motor 35 and a generator 36.
Detailed Description
As shown in fig. 1, this embodiment relates to a platform-constrained sea wave-driven compressed air energy storage system, which includes: an offshore floating hydraulic unit, a non-return reversing unit, a compressed air cylinder group, a compressed air storage tank 34, an expansion motor 35 and a generator 36 connected in sequence, wherein: the offshore floating hydraulic mechanism mainly generates heave degree of freedom motion under the action of sea waves, the generator is arranged at a fixed distance from the semi-submersible platform deck in the vertical and horizontal directions and is higher than the sea level, and the expansion motor is arranged above the sea level.
The marine floating hydraulic mechanism comprises: semi-submersible platform and set up raft 9, piston 10 and pneumatic cylinder 11 on it, wherein: the floating raft 9 is connected with the piston 10, and the output end of the hydraulic cylinder 11 is connected with the non-return reversing mechanism.
The outside of the hydraulic cylinder 11 is provided with a reinforcing stay bar 18.
The semi-submersible platform comprises: a semi-submersible platform deck 17 and toggle plates 15 and platform uprights 14 respectively disposed on upper and lower sides thereof.
The bottom of the semi-submersible platform deck 17 is further provided with a platform bottom buoy 16, mooring lines 13 and anchors 12.
The non-return reversing mechanism comprises: a check pipeline formed by a one-way valve and a four-way reversing valve 23 connected with the check pipeline, wherein: the two input ends of the check pipeline are respectively connected with the inner output end and the outer output end of the hydraulic cylinder 11, and the output end of the four-way reversing valve 23 is connected with the compression cylinder group.
When a wave is raised on the sea, the buoyant raft 9 will produce heave oscillatory motion under the action of the sea wave, but due to the restraining action of the semi-submersible platform, the buoyant raft 9 will only produce motion in heave degrees of freedom. The upward heave motion of the raft 9 will push the piston 10 upwards, the piston 10 pushing the water in the cylinder 11 out and through the non-return line. The check pipeline has the function of ensuring that the water does not flow back reversely in the process.
The compression cylinder group comprises two compression cylinders which are connected in parallel, air and water are filled in the compression cylinders, the bottoms of the compression cylinders are connected with a non-return reversing mechanism, and the tops of the compression cylinders are connected with a compressed air storage tank 34.
A cooler 31 is arranged between the compressed air cylinder group and the compressed air storage tank 34.
As shown in fig. 1, the buoyant raft 9 is preferably composed of three parts, wherein the middle part is a cylinder with the height of 52m, the diameter of the circular section of the cylinder is 30m, and the shell of the cylinder is made of a low carbon steel plate with the thickness of 25 mm. The lowermost part of the raft 9 is a hemisphere, the diameter of the largest circular section of the hemisphere is 30m, and the outer shell of the hemisphere is also made of a low carbon steel plate with the thickness of 25 mm. The uppermost part of the raft 9 is also a hemisphere, the diameter of the largest circular section of the hemisphere is 30m, the outer shell of the hemisphere is also made of a low carbon steel plate with the thickness of 25mm, and the movement of the raft 9 is limited by the semi-submersible platform of the supporting structure, so that only buoy heave movement generated by incident waves occurs.
As shown in fig. 1, the semi-submersible deck 17 is preferably a rectangular parallelepiped with length x width x height=170 m x 170m x 20m. The cuboid shell is made of a low-carbon steel plate with the thickness of 26 mm.
As shown in fig. 1, the platform upright 14 is preferably a rectangular parallelepiped with length x width x height=20m×20m×60deg.m. The cuboid shell is made of low-carbon steel plates with the thickness of 24 mm. The platform upright post is internally provided with a supporting material and angle steel longitudinal ribs.
As shown in fig. 1, the platform bottom buoy 16 is preferably an elliptic cylinder with a characteristic dimension=170 m×60m×30m. The outer shell of the elliptic cylinder is made of a low-carbon steel plate with the thickness of 25 mm.
Preferably, the mooring line 13 is made of a wire rope having a diameter of 350 mm.
Preferably, the reinforcing brace 18 is made of round steel having a cross-sectional diameter of 200 mm.
Preferably, the power rating of the generator 36 is 9800kW.
The embodiment relates to a control method of the system, which comprises the following steps: energy storage mode and power generation mode, wherein:
The energy storage mode refers to: the reciprocating motion of the hydraulic cylinder is repeated until the air in the compression cylinder is compressed to a preset storage pressure due to the input of wave energy. Once this pressure is reached, the valve is opened and the compressed air in the compressed air cylinder is discharged, and after cooling in the cooler between the air reservoir and the compressed air cylinder, the compressed air can be discharged and stored in the compressed air reservoir 3, i.e. the wave energy is converted into energy of the compressed air.
The power generation mode refers to: as water circulates progressively between the two compressed air cylinders, wave energy is stored in the compressed air storage tank until the maximum storage capacity (e.g., storage pressure) of the compressed air storage tank is reached. This stored compressed air can then be transported to a power generation site for power generation by an air expander, i.e.: air in the compressed air storage tank flows into the air expander through a pipeline and drives the motor to rotate, and the motor rotates to drive the generator to generate electricity through the driving shaft.
Under normal operation, the piston 10 in the hydraulic cylinder 11 is driven by waves, and the piston 10 of the hydraulic cylinder 11 is driven to reciprocate through heave motion of the buoy 9, so that water is pumped repeatedly. Regardless of the direction of movement of the piston 10, water always flows from point a to point B through the four-way reversing valve. This is because the specially designed four-way reversing valve rectifier determines the direction of water flow. Taking the example that the first compression cylinder (27) is in the process of charging and the second compression cylinder (26) is in the air compression cycle, the four-way reversing valve 23 is arranged at the left side position. Valves 5, 7 and 8 are closed and valve 6 is open. When the piston 10 in the hydraulic cylinder 11 moves downwards, water under the piston 10 is pumped into the second compression cylinder through the non-return valve 4. As the water second compression cylinder, the air in the second compression cylinder is compressed and stores energy. At the same time, the water in the first compression cylinder flows through the non-return valve 2 to the upper compartment of the hydraulic cylinder. The air volume of the cylinder I increases and air flows into the cylinder I through the valve 6. During this cycle, the valve 6 remains open at all times. When the cylinder piston moves up, water above the piston is pumped through the non-return valve 1 to the second compression cylinder. While the water in the first compression cylinder flows through the non-return valve 3 into the lower compartment of the hydraulic cylinder. During this compression, the air in the second compression cylinder is further compressed, as water is transferred from the first compression cylinder to the second compression cylinder under the drive of wave energy. The reciprocation of the hydraulic cylinder is repeated until the air in the second compression cylinder is compressed to a preset storage pressure. Once this pressure is reached, the valve 8 is opened and the compressed air in the second compressed cylinder is discharged and, after cooling in the cooler between the air reservoir and the compressed cylinder, is discharged and stored in the compressed air reservoir 34. The above-described cylinder movement continues until the water level reaches the highest position of the second compression cylinder, thereby completely discharging the air in the second compression cylinder into the compressed air tank 34. At the same time, air is completely filled into the first compression cylinder at atmospheric pressure or a preset pressure.
Thereafter, the four-way reversing valve 23 switches positions, valves 6 and 8 are closed, valve 5 is opened, and then water is pumped from the second compression cylinder to the first compression cylinder and the air in the first compression cylinder, similar to the procedure described in the text above. As the water circulates progressively between the two compressed air cylinders, wave energy is stored in the compressed air storage tank 34 until the maximum storage capacity (e.g., storage pressure) of the compressed air storage tank is reached. This stored compressed air can then be transported to a power generation site for power generation by an air expander, i.e.: air in the compressed air storage tank 34 flows into the air expander 35 through a pipeline and drives a motor to rotate, and the motor rotates to drive the generator 36 through a driving shaft to generate electricity.
Through specific practical experiments, in the offshore wave environment of the southward island in China, the hydraulic damping effect of the liquid piston in the device is continuously enhanced in the running process, and the system has no natural frequency in the running process. As wave frequencies increase, the capture coefficient and stored power of the system also increases. The capturing coefficient of the whole system is up to 20%, and the research of numerical simulation by using MATLAB program shows that the performance of the sea wave driven compressed air energy storage system constrained by the platform is superior to that of the traditional wave energy converter system reported in literature. The system has better performance, and the energy storage power based on the isothermal compression process is improved by about 32% under the same wave condition.
Compared with the prior art, the ocean wave energy power generation device can greatly reduce the motion of the ocean wave energy power generation device under the action of ocean waves through the constraint function of the semi-submersible platform, namely, the floating raft 9 only generates the motion in heave degrees of freedom. Therefore, the risk of failure and damage of the hydraulic cylinder, the hydraulic motor and the generator can be greatly reduced, and the equipment replacement or maintenance cost is greatly reduced. Meanwhile, the device can not cause serious pollution to the marine environment.
The foregoing embodiments may be partially modified in numerous ways by those skilled in the art without departing from the principles and spirit of the invention, the scope of which is defined in the claims and not by the foregoing embodiments, and all such implementations are within the scope of the invention.
Claims (9)
1. A platform constrained sea wave driven compressed air energy storage system comprising: the marine floating hydraulic mechanism, the non return reversing mechanism, the compressed air cylinder group, the compressed air storage tank, the expansion motor and the generator that link to each other in proper order, wherein: the offshore floating hydraulic mechanism mainly generates heave degree of freedom motion under the action of sea waves, the generator is arranged at a fixed distance from the semi-submersible platform deck in the vertical and horizontal directions and is higher than the sea level, and the expansion motor is arranged above the sea level.
2. The platform-constrained sea wave driven compressed air energy storage system of claim 1, wherein the offshore floating hydraulic mechanism comprises: semi-submerged platform and set up buoyant raft, piston and pneumatic cylinder on it, wherein: the floating raft is connected with the piston, and the output end of the hydraulic cylinder is connected with the non-return reversing mechanism.
3. The platform-constrained sea wave driven compressed air energy storage system of claim 2, wherein the hydraulic cylinder is externally provided with a reinforcing stay bar.
4. The platform-constrained sea wave driven compressed air energy storage system of claim 2, wherein the semi-submersible platform comprises: the semi-submersible platform deck and the toggle plates and the platform upright posts are respectively arranged on the upper side and the lower side of the semi-submersible platform deck.
5. The platform-constrained sea wave driven compressed air energy storage system of claim 2, wherein the bottom of the half-platform deck is further provided with pontoons, mooring lines and anchors.
6. The platform-constrained sea wave driven compressed air energy storage system of claim 1, wherein the non-return reversing mechanism comprises: a check pipeline formed by a one-way valve and a four-way reversing valve connected with the check pipeline, wherein: the two input ends of the check pipeline are respectively connected with the inner output end and the outer output end of the hydraulic cylinder, and the output end of the four-way reversing valve is connected with the compression cylinder group;
When the wind and wave are raised on the sea surface, the floating raft can generate fluctuation oscillation motion under the action of the sea wave, but due to the constraint effect of the semi-submersible platform, the floating raft can only generate motion on the heave degree of freedom, the upward heave motion of the floating raft can push the piston upwards, the piston pushes water in the hydraulic cylinder to flow out and pass through the check pipeline, and the effect of the check pipeline is to ensure that the water does not flow back in reverse direction in the process.
7. The platform-constrained sea wave driven compressed air energy storage system of claim 1, wherein the compressed air cylinder group comprises two compressed air cylinders connected in parallel, the compressed air cylinders are filled with air and water, the bottoms of the compressed air cylinders are connected with the non-return reversing mechanism, and the tops of the compressed air cylinders are connected with the compressed air storage tank.
8. The platform-constrained sea wave driven compressed air energy storage system of claim 1, wherein a cooler is provided between the compressed air cylinder group and the compressed air storage tank.
9. A system-based prescribed control method according to any one of claims 1-8, comprising: energy storage mode and power generation mode, wherein:
The energy storage mode refers to: the hydraulic cylinder is driven to reciprocate by wave energy until the air in the compressed air cylinder is compressed to a preset storage pressure, the valve is opened to discharge the compressed air in the compressed air cylinder, and the compressed air is cooled in a cooler between the air storage tank and the compressed air cylinder and then stored in the compressed air storage tank, namely the wave energy is converted into the energy of the compressed air;
The power generation mode refers to: as water circulates progressively between the two compressed air cylinders, wave energy is stored in the compressed air storage tank until the maximum storage capacity of the compressed air storage tank is reached, and the stored compressed air flows into the air expander through the pipeline and drives the motor to rotate, and the motor rotates to drive the generator to generate electricity through the driving shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410095233.8A CN118148878A (en) | 2024-01-23 | 2024-01-23 | Sea wave-driven compressed air energy storage system constrained by platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410095233.8A CN118148878A (en) | 2024-01-23 | 2024-01-23 | Sea wave-driven compressed air energy storage system constrained by platform |
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| CN118148878A true CN118148878A (en) | 2024-06-07 |
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| CN202410095233.8A Pending CN118148878A (en) | 2024-01-23 | 2024-01-23 | Sea wave-driven compressed air energy storage system constrained by platform |
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| CN (1) | CN118148878A (en) |
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- 2024-01-23 CN CN202410095233.8A patent/CN118148878A/en active Pending
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