Energy storage block restraint system and method for offshore gravity energy storage

Abstract

The invention provides an energy storage block restraining system and method for offshore gravity energy storage, and belongs to the technical field of offshore gravity energy storage, the energy storage block restraining system comprises a tension mooring cable, the two ends of the tension mooring cable are fixedly connected with a water surface floating platform and a seabed respectively, a plurality of restraining devices arranged up and down are installed on the tension mooring cable, and the restraining devices are in an A shape; the restraining device comprises a main sleeve, a restraining sleeve and a static sleeve, the main sleeve, the restraining sleeve and the static sleeve are connected through connecting rods, the tension mooring cable is sleeved with the main sleeve, the first mooring rope of the restrained energy storage block in the restrained state is sleeved with the restraining sleeve, and the second mooring rope of the static energy storage block in the static state is sleeved with the static sleeve. Movement of the energy storage block is restrained through the restraining device, so that disturbance of the energy storage block to the marine environment is reduced, the cable tension is stabilized, and the stability of the energy storage system is improved. Graphite sliding blocks in the main sleeve and the static sleeve can reduce friction resistance of relative movement of the restraining device and the cable.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore gravity energy storage, and in particular relates to an energy storage block constraint system and method for offshore gravity energy storage. Background Art

[0002] In the field of offshore gravity energy storage, there's a scenario where an energy storage system is required: when there's a power surplus, the excess electricity is used to drive an electric motor to lift a weight to a certain height, shifting the weight from a low position to a high position. When there's a power deficit, the weight is released and lowered, driving a generator to generate the required electricity, shifting the weight from a high position to a low position. This process completes one energy storage cycle. In gravity energy storage, weights are often referred to as energy storage blocks. When the energy storage block is in the high position, the electrical energy used to drive the electric motor can be considered to have been converted into the gravitational potential energy of the energy storage block and stored. Because the gravitational potential energy of the energy storage block does not decrease over time, gravity energy storage offers the advantages of long-term energy storage and zero self-discharge. Given the thousands of meters of height difference at sea and the tens of thousands of tons of deadweight capacity of conventional floating platforms, offshore gravity energy storage offers significant storage capacity and certain cost advantages.

[0003] One end of the energy storage block is suspended at the end of a cable that is several thousand meters long, allowing the energy storage block to rise and fall within a water depth of several thousand meters. Due to the influence of ocean currents or other external factors, the energy storage block will produce horizontal movement, and the energy storage block and the cable will swing like a "swing." The offshore gravity energy storage system stores energy through the lifting and lowering movement of the energy storage block, but horizontal movement does not help with energy storage and creates the risk of collision between energy storage blocks, so it is necessary to find a way to constrain it. The existing technology has not yet proposed a way to constrain offshore gravity energy storage, so there is an urgent need to propose a constraint method. Summary of the Invention

[0004] The object of the present invention is to provide an energy storage block constraint system and method for offshore gravity energy storage, which utilizes a floating platform tension mooring cable for motion constraint.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A storage block constraint system for offshore gravity energy storage comprises a tension mooring cable, wherein both ends of the tension mooring cable are fixedly connected to a floating platform and a seabed, respectively; a plurality of vertically arranged constraint devices are mounted on the tension mooring cable; the constraint devices are A-shaped and comprise a main sleeve, a constraint sleeve, and a stationary sleeve; the main sleeve, the constraint sleeve, and the stationary sleeve are connected by a connecting rod; the main sleeve is sleeved on the tension mooring cable; the constraint sleeve is sleeved on a first cable of a constrained energy storage block in a constrained state; and the stationary sleeve is sleeved on a second cable of a stationary energy storage block in a stationary state.

[0007] Furthermore, a locking device is installed on the constraint sleeve to fix the constraint device and the constrained energy storage block.

[0008] Furthermore, a graphite slider is installed inside the main sleeve to reduce wear on the cable and mooring cable.

[0009] Furthermore, a graphite slider is installed inside the stationary sleeve to reduce wear on the cables and mooring cables.

[0010] The present invention may also include:

[0011] A method for constraining energy storage blocks for offshore gravity energy storage, using the above-mentioned system, comprises the following steps:

[0012] A tension mooring line is tied to a floating platform on the water surface, and a plurality of constrained energy storage blocks and static energy storage blocks are constrained by using the tension mooring line;

[0013] During the external discharge process of the energy storage system, several energy storage blocks fall down in sequence. When the first energy storage block falls, there is no other energy storage block below it, so there is no collision risk and no need for restraint.

[0014] During the subsequent falling of the energy storage blocks, in order to prevent the energy storage blocks from colliding with each other, a restraint device is fixed at one end point of the cable of the falling energy storage block, a restraint sleeve ring at one end point of the restraint device is sleeved on the outside of the cable of the falling energy storage block and fixed using a locking device (10), a main sleeve ring at the top of the restraint device is sleeved on the tension mooring cable, and a sleeve ring at the other end point of the restraint device is sleeved on the cable of the last falling energy storage block, and the energy storage block has completed its falling and becomes a stationary energy storage block;

[0015] There is slippage between the restraining device and the tension mooring cable and the second cable of the stationary energy storage block. When the falling energy storage block reaches the bottom of the water, the energy storage block stops moving and becomes a stationary energy storage block. Subsequently, the energy storage block adjacent to it begins to fall, and the restraining device restrains the falling energy storage block, i.e., the constrained energy storage block, through the first cable of the stationary energy storage block and the tension mooring cable.

[0016] Furthermore, the energy storage blocks are evenly arranged with the tension mooring cable as the center, and fall in sequence in a clockwise or counterclockwise adjacent order. After the previous energy storage block completes its fall, the adjacent energy storage blocks in sequence begin to fall.

[0017] Furthermore, when the energy storage system receives external power input, the energy storage blocks are lifted to the floating platform on the water surface in sequence. This process is opposite to the external discharge process of the energy storage system. The energy storage blocks fall in a clockwise order during the falling process, and are lifted in a counterclockwise order during the lifting process.

[0018] The beneficial effects of the present invention are:

[0019] The present invention constrains the movement of the energy storage block through a constraint device, thereby reducing the disturbance of the energy storage block to the marine environment, thereby stabilizing the cable tension and improving the stability of the energy storage system; the graphite sliders in the main sleeve and the stationary sleeve can reduce the friction resistance of the relative movement between the constraint device and the cable, reducing the wear caused by relative movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attachment Figure 1 It is a schematic diagram of the working state of the present invention.

[0021] Attachment Figure 2 It is a perspective view of the restraint device of the present invention.

[0022] Attachment Figure 3 It is a front view of the restraint device of the present invention.

[0023] Attachment Figure 4 It is attached Figure 3 Left view of .

[0024] Attachment Figure 5 It is attached Figure 3 Top view of .

[0025] In the accompanying drawings: 1. Constraint device, 2. Constraint sleeve, 3. Stationary sleeve, 4. Cable 1, 5. Cable 2, 6. Main sleeve, 7. Tension mooring cable, 8. Constrained energy storage block, 9. Stationary energy storage block, 10. Locking device, 11. Graphite slider. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] The present invention provides an energy storage block constraint system for offshore gravity energy storage, as shown in the attached Figure 1-5 As shown, it includes: a tension mooring cable 7, the two ends of which are fixedly connected to the floating platform and the seabed respectively, and a plurality of restraint devices 1 arranged up and down are installed on the tension mooring cable 7. The restraint device 1 is A-shaped, and the restraint device 1 includes a main sleeve 6, a restraint sleeve 2, and a static sleeve 3. The main sleeve 6, the restraint sleeve 2, and the static sleeve 3 are connected by a connecting rod. The main sleeve 6 is sleeved on the tension mooring cable 7, and the restraint sleeve 2 is sleeved on the cable 1 4 of the constrained energy storage block 8 in the constrained state. The static sleeve 3 is sleeved on the cable 2 5 of the static energy storage block 9 in the static state.

[0028] As attached Figure 2 As shown, a locking device 10 is installed on the constraint sleeve 2 to fix the constraint device 7 and the constrained energy storage block 8.

[0029] In this embodiment, graphite sliders 11 are installed inside the main sleeve 6 and the stationary sleeve 3 to reduce wear on cables and mooring lines.

[0030] In the offshore gravity energy storage system, the tension mooring cable 7 uses a tension leg mooring cable, with its ends fixed to the floating platform and the seabed, respectively, to prevent the floating platform from shifting due to external factors such as wind and waves. This mooring cable is always vertical, providing a constraint for the energy storage blocks. During the raising and lowering of a particular energy storage block, a restraining device is used to constrain the spacing between adjacent blocks, preventing collisions or entanglements.

[0031] The restraining device is used to restrain the movement of the energy storage block using a tension mooring cable. The restraining device 1 is A-shaped as a whole, with a restraining sleeve 2 and a static sleeve 3 at the two end points, respectively surrounding the cable 1 4 of the constrained energy storage block and the cable 2 5 of the static energy storage block, and a main sleeve 6 at the vertex surrounding the tension mooring cable 7. Since the cable and mooring cable of the static energy storage block are in a static and vertical state, the two together realize the restraint of the constrained energy storage block in the horizontal direction. Among them, the restraining device is fixedly connected to the constrained energy storage block 8 and rises and falls together. A locking device 10 is used to fix the restraining device to the constrained energy storage block. When the restraining device moves vertically with the constrained energy storage block, it is relatively stationary with the constrained energy storage block, and moves vertically relative to the cable and tension mooring cable of the static energy storage block.

[0032] The present invention may also include:

[0033] A method for constraining energy storage blocks for offshore gravity energy storage, using the above-mentioned system, comprises the following steps:

[0034] A tension mooring line 7 is tied to the floating platform on the water surface, and a plurality of constrained energy storage blocks 8 and static energy storage blocks 9 are constrained by the tension mooring line 7;

[0035] During the external discharge process of the energy storage system, several energy storage blocks fall down in sequence. When the first energy storage block falls, there is no other energy storage block below it, so there is no collision risk and no need for restraint.

[0036] During the subsequent falling process of the energy storage blocks, in order to prevent the energy storage blocks from colliding with each other, a restraint device 1 is fixed to the end point of the cable 1 4 of the falling energy storage block. The restraint sleeve 2 at one end point of the restraint device is looped around the outside of the cable 1 4 of the falling energy storage block and fixed using a locking device 10. The main sleeve 6 at the top of the restraint device 1 is looped around the tension mooring cable 7, and the sleeve 3 at the other end point of the restraint device 1 is looped around the cable 2 5 of the previous falling energy storage block. The energy storage block has completed its fall and becomes a stationary energy storage block 9.

[0037] There is slippage between the restraining device 1 and the tension mooring cable 7 and the cable 2 5 of the stationary energy storage block 9. When the falling energy storage block reaches the bottom of the water, the energy storage block stops moving and becomes the stationary energy storage block 9. Subsequently, the energy storage block adjacent to it begins to fall, and the restraining device 1 restrains the falling energy storage block, i.e., the constrained energy storage block 8, through the cable 1 4 of the stationary energy storage block and the tension mooring cable 7.

[0038] Furthermore, the energy storage blocks are evenly arranged with the tension mooring cable 7 as the center, and fall in sequence in a clockwise or counterclockwise order. After the previous energy storage block completes its fall, the adjacent energy storage blocks in sequence begin to fall.

[0039] When the energy storage system receives external power input, the energy storage blocks are lifted to the floating platform on the water surface in sequence. This process is opposite to the external discharge process of the energy storage system. The energy storage blocks fall in a clockwise order during the falling process and are lifted in a counterclockwise order during the lifting process.

[0040] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or 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 energy storage block constraint system for offshore gravity energy storage, characterized in that: include: A tension mooring cable (7), wherein both ends of the tension mooring cable (7) are fixedly connected to a water surface floating platform and a seabed respectively; a plurality of restraining devices (1) arranged up and down are installed on the tension mooring cable (7); the restraining device (1) is A-shaped; the restraining device (1) comprises a main sleeve (6), a restraining sleeve (2), and a static sleeve (3); the main sleeve (6), the restraining sleeve (2), and the static sleeve (3) are connected by a connecting rod; the main sleeve (6) is sleeved on the tension mooring cable (7); the restraining sleeve (2) is sleeved on a cable 1 (4) of a constrained energy storage block (8) in a constrained state; and the static sleeve (3) is sleeved on a cable 2 (5) of a static energy storage block (9) in a static state.

2. The energy storage block constraint system for offshore gravity energy storage according to claim 1, characterized in that: A locking device (10) is installed on the constraint sleeve (2) to fix the constraint device (7) and the constrained energy storage block (8).

3. The energy storage block constraint system for offshore gravity energy storage according to claim 2, characterized in that: A graphite slider (11) is installed inside the main sleeve (6) to reduce wear on cables and mooring lines.

4. The energy storage block constraint system for offshore gravity energy storage according to claim 2, characterized in that: A graphite slider (11) is installed inside the stationary sleeve (3) to reduce wear on cables and mooring lines.

5. A method for constraining energy storage blocks for offshore gravity energy storage, using the system according to any one of claims 1 to 4, characterized in that: The steps include: A tension mooring cable (7) is tied to a floating platform on the water surface, and a plurality of constrained energy storage blocks (8) and a static energy storage block (9) are constrained by using the tension mooring cable (7); During the external discharge process of the energy storage system, several energy storage blocks fall down in sequence. When the first energy storage block falls, there is no other energy storage block below it, so there is no collision risk and no need for restraint. During the subsequent falling process of the energy storage blocks, in order to prevent the energy storage blocks from colliding with each other, a restraining device (1) is fixed at the end point of the cable one (4) of the falling energy storage block, the restraining sleeve (2) at one end point of the restraining device is looped around the outside of the cable one (4) of the falling energy storage block and fixed using a locking device (10), the main sleeve (6) at the top of the restraining device (1) is looped around the tension mooring cable (7), and the sleeve (3) at the other end point of the restraining device (1) is looped around the cable two (5) of the last falling energy storage block, and the energy storage block has completed its falling and becomes a stationary energy storage block (9); There is sliding between the restraining device (1) and the tension mooring cable (7) and the second cable (5) of the stationary energy storage block (9). When the falling energy storage block reaches the bottom of the water, the energy storage block stops moving and becomes the stationary energy storage block (9); then the energy storage block in the adjacent position starts to fall, and the restraining device (1) restrains the falling energy storage block, i.e., the constrained energy storage block (8), through the first cable (4) of the stationary energy storage block and the tension mooring cable (7).

6. The energy storage block constraint method for offshore gravity energy storage according to claim 5, characterized in that: The energy storage blocks are evenly arranged with the tension mooring cable (7) as the center, and fall in sequence in a clockwise or counterclockwise adjacent order. After the previous energy storage block completes its fall, the adjacent energy storage blocks in sequence begin to fall.

7. The energy storage block constraint method for offshore gravity energy storage according to claim 6, characterized in that: When the energy storage system receives external power input, the energy storage blocks are lifted to the floating platform on the water surface in sequence. This process is opposite to the external discharge process of the energy storage system. The energy storage blocks fall in a clockwise order during the falling process and are lifted in a counterclockwise order during the lifting process.

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