CN116498513A - Gravel gravity energy storage device and energy storage method - Google Patents

Abstract

The invention provides a gravel gravity energy storage device and an energy storage method, wherein the device comprises the following components: gravel building blocks and hoisting devices; the hoisting device is provided with a cable and a mechanical arm, one end of the cable is connected with the mechanical arm, the mechanical arm is used for clamping gravel building blocks, and the other end of the cable is connected with an electric power generation integrated machine; when the fluctuation of the new photovoltaic wind power energy base is excessive or the power generation capacity exceeds the power grid load, redundant wind power or solar photovoltaic power generation is supplied to an electric power generation integrated machine, and gravel blocks are stacked from bottom to top in situ into a high tower to store gravitational potential energy through a cable and a mechanical arm of a lifting device; when the power consumption peak period or the power generation capacity can not meet the power consumption load of the power grid, the lifting device carries the gravel building blocks to fall from top to bottom to release gravitational potential energy, the other end of the mooring rope connected with the lifting device is connected with the motor generator integrated machine, and the gravity acting of the gravel building blocks is utilized to drive the generator to generate power. The gravel building blocks are used as the gravity energy storage carriers, so that the cost of the gravity energy storage system is reduced.

Description

Gravel gravity energy storage device and energy storage method

technical field

The technical field of physical mechanical energy storage of the present invention particularly relates to a gravel gravity energy storage device and an energy storage method.

Background technique

Renewable energy represented by wind energy and solar energy has developed rapidly, but its uneven spatial distribution and instability of supply time greatly limit the development of new energy technologies. There is a growing need for various energy storage technologies in the grid. The field of energy storage will be application-oriented, break through the bottleneck of existing technology development, and evaluate the advanced nature and applicability of energy storage technology with high safety, long life, high efficiency, low cost, large-scale, sustainable development and other indicators.

Among the many energy storage methods, the widely used energy storage technologies mainly include electrochemical energy storage (such as lead-acid batteries and lithium batteries) and gravity energy storage (such as pumped storage). Electrochemical energy storage technology is mostly used in small and medium-sized energy application scenarios. The energy storage capacity is limited, which is easy to cause environmental pollution, and the service life of the battery is usually within a few years, and the number of charge and discharge is limited. Pumped storage is currently the most widely used and most mature method of gravitational energy storage. It realizes energy storage and release through the mutual conversion of water potential energy and electric energy. It has large storage capacity, high efficiency, long life, and long storage period However, the construction of pumped storage power stations is heavily dependent on geographical conditions, especially the need to rely on local abundant water resources and geographical height differences to build reservoirs and dams of a specific scale. The construction scale is large and the construction cost is high.

Contents of the invention

In order to solve the impact of the volatility and randomness of wind power and other new energy power generation on the power system and to assist the power grid in peak regulation and frequency regulation, the present invention proposes a gravel gravity energy storage device and energy storage method, using sand and gravel blocks as the gravity energy storage carrier , using the sand and gravel blocks to form a height difference, no need to build additional highlands, which greatly reduces the cost of the gravity energy storage system, especially suitable for Northwest and North China with abundant scenery resources and severe desertification, and is not affected by geographical conditions , weather, etc., low investment and construction costs, broad application prospects.

In order to achieve the above object, the present invention adopts the following technical solutions:

The first aspect of the present invention provides a gravel gravity energy storage device, comprising:

A gravel block and a lifting device; wherein, the lifting device is provided with a cable and a mechanical arm, one end of the cable is connected to the mechanical arm, the mechanical arm is used to clamp the gravel block, and the other end of the cable is connected to an electric generator;

When the photovoltaic wind power new energy base fluctuates too much or the power generation exceeds the load of the grid, the excess wind power or solar photovoltaic power is supplied to the integrated motor generator, and the sand and gravel blocks are stacked from bottom to top in situ through the cables and mechanical arms of the lifting device. Tall towers store gravitational potential energy;

When it is in the peak period of electricity consumption or the power generation cannot meet the power load of the grid, the lifting device carries the sand and gravel blocks and falls from top to bottom to release the gravitational potential energy. The work done by the gravity of the block drives the generator to generate electricity.

Further, the gravel blocks include hollow cube blocks and sand filled inside the cube blocks.

Further, a slot is provided on the outside of the cube near the top surface, and a chuck matching the shape of the slot is provided on the mechanical arm. When clamping the cube, the chuck holds in the card slot.

Further, it also includes a set of magnetic attraction devices, a part of the magnetic attraction devices is arranged on the mechanical arm, and the other part is arranged in the card slot.

Further, with the lifting device as the center, the sand and gravel blocks are stacked outwards from the center to form a block unit. There is a certain gap between each block unit for the mechanical arm to snap in, and the stacking surfaces without slots are closely arranged. , with no gaps.

Further, the sand is obtained by filtering the sand pile through a sand filtering device.

Furthermore, the gravel blocks are stacked from the ground from bottom to top, and the height difference is formed by stacking the gravel blocks themselves.

In a second aspect, the present invention provides an energy storage method for a gravel gravity energy storage device, comprising the following steps:

The sand in the sand pile is transported to the sand filter device, and the sand filter device uses a screen to filter the gravel;

Pour the filtered gravel into cubes with regular shape, and encapsulate to form a gravel block;

One end of the cable on the lifting device is connected to the motor-generator, and the other end is connected to the mechanical arm. The front and rear surfaces of the gravel block are designed with a slot, and the chuck of the mechanical arm is positioned by the magnetic suction device to clamp the slot;

When the photovoltaic wind power new energy base fluctuates too much or the power generation exceeds the load of the grid, the excess wind power or solar photovoltaic power is supplied to the integrated motor generator, and the sand and gravel blocks are stacked from bottom to top in situ through the cables and mechanical arms of the lifting device. Tall towers store gravitational potential energy;

When it is in the peak period of electricity consumption or the power generation cannot meet the power load of the grid, the lifting device carries the sand and gravel blocks and falls from top to bottom to release the gravitational potential energy. The work done by the gravity of the block drives the generator to generate electricity.

Further, with the lifting device as the center, the sand and gravel blocks are stacked outwards from the center to form a block unit. There is a certain gap between each block unit for the mechanical arm to snap in, and the stacking surfaces without slots are closely arranged. , with no gaps.

Furthermore, the gravel blocks are stacked from the ground from bottom to top, and the height difference is formed by stacking the gravel blocks themselves.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The sand and gravel gravity energy storage device of the present invention uses sand and gravel blocks as the gravity energy storage carrier, which greatly reduces the cost of the gravity energy storage system; belongs to the technical field of physical mechanical energy storage, has no other loss during use, and has a service life of up to 40-60 years .

The sand and gravel gravity energy storage device of the present invention utilizes the stacking of sand and gravel blocks to form a height difference, without the need to build additional highlands, greatly reduces the difficulty and cost of energy storage construction, and has wide applicability.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Figure 1 is a schematic diagram of the overall system of a gravel gravity energy storage device according to an embodiment of the present invention;

Fig. 2 is a stacked front view of gravel blocks in an embodiment of the present invention;

Fig. 3 is a stacked top view of gravel blocks in an embodiment of the present invention;

In the accompanying drawings, the list of parts represented by each label is as follows: 1-sand pile; 2-sand filter device; 3-sand gravel block; 4-lifting device; Arm; 8-PV wind power new energy base area; 9-Grid power load.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

The following detailed descriptions are all exemplary descriptions, and are intended to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs. Terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In order to solve the impact of the volatility and randomness of new energy power generation such as wind and solar on the power system, and to assist power grid peak regulation and frequency regulation. The invention provides a gravel gravity energy storage device, which uses gravel blocks as a gravity energy storage carrier, greatly reducing the cost of the gravity energy storage system. When the photovoltaic wind power new energy base fluctuates too much or the power generation exceeds the load of the grid, the excess wind power or solar photovoltaic power supply is activated, and the sand and gravel blocks are stacked from bottom to top to form a tall tower to store gravitational potential energy. When it is in the peak period of electricity consumption or the power generation cannot meet the power load of the grid, the lifting device carries the sand and gravel blocks and falls from top to bottom to release the gravitational potential energy. The work done by the gravity of the block drives the generator to generate electricity. The invention belongs to the technical field of physical mechanical energy storage. The service life can reach 40-60 years, and the construction, operation and maintenance are simple, which avoids the common problems of complex systems and high costs in existing energy storage structures.

Example 1

As shown in Figure 1, a gravel gravity energy storage device includes:

Gravel block 3 and lifting device 4; wherein, the lifting device 4 is provided with a cable and a mechanical arm 7, one end of the cable is connected to the mechanical arm 7, and the mechanical arm 7 is used to clamp the gravel block 3, and the other end of the cable is connected to a Electric generator integrated machine 6;

When the photovoltaic wind power new energy base 9 fluctuates too much or the power generation exceeds the power load 9 of the grid, the excess wind power or solar photovoltaic power is supplied to the electric generator 6, and the sand and gravel blocks are lifted by the cable of the lifting device 4 and the mechanical arm 7 3 Stacked in place from bottom to top to form a tall tower to store gravitational potential energy;

When it is in the peak period of power consumption or the power generation cannot meet the power load 9 of the grid, the lifting device 4 carries the gravel blocks 3 and falls from top to bottom to realize the release of gravitational potential energy, and the other end of the cable connected to the lifting device 4 is connected to the motor generator. Machine 6 utilizes gravel block gravity to do work to drive generator to generate electricity.

Specifically, the hoisting device 4 involved in this solution may be a crane or a spreader, such as a tower crane. The electric generator 6 drives the cables set on the crane or spreader to lift the gravel block 3 or lift it from a high place. lay down.

When hoisting the gravel block 3, the electric generator integrated machine drives the crane to lift up the cable, or directly lifts up the cable on the sling, so that the gravel block is lifted, and the gravel block 3 is stacked together in turn .

When it is necessary to generate electricity, use a crane or spreader to lift the gravel block and lower the gravel block under the action of gravity, drive the electric generator 6 to generate electricity through the cable, start from the gravel block 3 at the top, and gradually remove the gravel Blocks 3 are placed on the bottom surface from a height. .

Specifically, the gravel block 3 includes a hollow cube block and sand filled inside the cube block.

More specifically, the sand in the sand pile 1 is transported to the sand filter device 2 by a cart or an excavator, and the sand filter device 2 uses a screen to filter out impurities to ensure the uniformity of the sand and ensure that the quality of the sand and gravel blocks is close to Uniform and uniform; pour the filtered gravel into regular shaped cube blocks for encapsulation to form a gravel block 3 .

As an example, a cube block could be constructed of cement, cast iron or steel, with a hollow interior filled with gravel.

As a more specific example, each gravel block weighs 3-5 tons and is 2-3 meters high.

In a preferred embodiment, a clamping slot 5 is provided on the outside of the cube block near the top surface, and a chuck that matches the shape of the clamping slot 5 is provided on the mechanical arm 7. When clamping the cube block, the clip The head is clamped in the draw-in groove 5, and the mechanical arm 7 can be clamped in the draw-in groove 5 to lift or put down the sand block 3.

As an example, the card slot 5 may be provided on two opposite side surfaces of the cube block, located near the top surface. The card slot 5 can be a semicircular slot, or can also be a square slot or the like suitable for the slot body in this solution. The specific shape is not limited.

In a more preferred embodiment, a set of magnetic attraction devices is also included, a part of the magnetic attraction devices is arranged on the mechanical arm 7 , and the other part is arranged in the card slot 5 . A magnetic suction device is installed on the card slot 5 and the mechanical arm 7, and the relative position of the card slot 5 and the mechanical arm 7 is accurately positioned through the magnetic suction device, saving the matching time of the card slot and the mechanical arm;

As shown in Figures 2 and 3, with the lifting device 4 as the center, the sand and gravel blocks 3 are stacked outwards from the center to form a block unit. There is a certain gap between each block unit for the mechanical arm to snap in. The stacking surfaces of the troughs are closely arranged without gaps. The gravel blocks 3 are stacked from the ground from bottom to top, and the height difference is formed by stacking the gravel blocks 3 themselves, without the need to build additional high ground, which greatly reduces the difficulty and cost of energy storage construction. It has wide applicability and has no other problems during use. Wear and tear, the service life is as long as 40-60 years.

Example 2

An energy storage method of a gravel gravity energy storage device, comprising the following steps:

S1: In deserts, Gobi, deserts and other photovoltaic wind power new energy bases 8, use sand and gravel or gravel in deserts and Gobi as fillers, and plan to build the scale of sand and gravel gravity energy storage devices;

S2: On-site investigation of the foundation and geological structure of the built site, design and construction of the foundation foundation of the sand and gravel gravity energy storage device, to meet the foundation load-bearing requirements of the highest stacking height of the sand and gravel gravity energy storage;

S3: Use sand, stones, gravel and other materials on site and in the vicinity to produce filling gravel energy storage blocks on site. The load-bearing shell of the block can be made by on-site pouring or welding of cement, cast iron or steel structures to reduce the size of the blocks. production costs;

S4: Design and build the crane and spreader, install the electric generator integrated machine and lifting rope on the top of the crane tower, and debug the normal operation of the block hoisting power consumption and energy storage mode and the block falling power generation mode;

S5: Connect the energy storage device to the nearby power grid or the ex-factory busbar of the new energy power plant for power supply, so as to realize the energy storage and discharge functions of the gravel gravity energy storage tower device.

The sand in the sand pile 1 is transported to the sand filter device 2, and the sand filter device 2 uses a screen to filter the gravel;

Pour the filtered gravel into cube blocks with regular shape, and encapsulate to form a gravel block 3;

One end of the cable on the lifting device 4 is connected to the electric generator, and the other end is connected to the mechanical arm 7. The front and rear surfaces of the gravel block are designed with a slot 5, and the chuck of the mechanical arm 7 is positioned by a magnetic suction device to clamp the slot. 5;

When the photovoltaic wind power new energy base 8 fluctuates too much or the power generation exceeds the power grid load 9, the excess wind power or solar photovoltaic power is supplied to the electric generator 6, and the sand and gravel blocks are lifted by the cable of the lifting device 4 and the mechanical arm 7. 3 Stacked in place from bottom to top to form a tall tower to store gravitational potential energy;

When it is in the peak period of power consumption or the power generation cannot meet the power load 9 of the grid, the lifting device 4 carries the gravel blocks 3 and falls from top to bottom to realize the release of gravitational potential energy, and the other end of the cable connected to the lifting device 4 is connected to the motor generator. Machine 6 utilizes gravel block gravity to do work to drive generator to generate electricity.

Among them, with the lifting device 4 as the center, the sand and gravel blocks 3 are stacked outwards from the center to form a block unit. There is a certain gap between each block unit for the mechanical arm to snap in, and the stacking surfaces without slots are closely spaced. Arrangement without gaps. The gravel blocks 3 are stacked layer by layer from the ground from bottom to top, and the gravel blocks 3 are stacked layer by layer to form a height difference.

In the description of this specification, descriptions referring to the terms "one embodiment", "example", "specific example" and the like mean that specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present invention. In an embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It can be known from common technical knowledge that the present invention can be realized through other embodiments without departing from its spirit or essential features. Accordingly, the above-disclosed embodiments are, in all respects, illustrative and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are embraced by the present invention.

Claims (10)

1. A gravel gravity energy storage device, comprising:

a gravel block (3) and a lifting device (4); the hoisting device (4) is provided with a cable and a mechanical arm (7), one end of the cable is connected with the mechanical arm (7), the mechanical arm (7) is used for clamping the gravel building block (3), and the other end of the cable is connected with an electric power generation integrated machine (6);

when the fluctuation of a photovoltaic wind power new energy base (8) is excessive or the power generation amount exceeds a power grid power utilization load (9), redundant wind power or solar photovoltaic power generation is supplied to an electric power generation integrated machine (6), and gravel blocks (3) are stacked from bottom to top in situ into a high tower to store gravitational potential energy through a cable and a mechanical arm (7) of a lifting device (4);

when the power consumption peak period or the power generation capacity can not meet the power grid power consumption load (9), the lifting device (4) carries the gravel building blocks (3) to fall from top to bottom to release gravitational potential energy, the other end of a mooring rope connected with the lifting device (4) is connected with the motor generator integrated machine (6), and the gravity acting of the gravel building blocks is utilized to drive the generator to generate power.

2. A gravel gravity energy storage device according to claim 1, characterized in that the gravel block (3) comprises a hollow cube and sand filled inside the cube.

3. The gravel gravity energy storage device according to claim 2, wherein a clamping groove (5) is formed in the outer portion of the cube block and close to the top surface, and clamping heads matched with the clamping groove (5) in shape are arranged on the mechanical arm (7), and when the cube block is clamped, the clamping heads are clamped in the clamping groove (5).

4. A gravel gravity energy storage device according to claim 3, further comprising a set of magnetic attraction means, one part of which is arranged on the mechanical arm (7) and the other part of which is arranged in the clamping groove (5).

5. The gravel gravity energy storage device according to claim 1, wherein the hoisting device (4) is taken as a center, the gravel blocks (3) are piled up in a divergent manner from the center to form block units, a certain gap is reserved between each block unit for clamping in a mechanical arm, and the piled up surfaces without clamping grooves are closely arranged without gaps.

6. A sand gravity energy storage device according to claim 2, characterised in that the sand is obtained by filtering sand from a sand pile (1) through a sand filtering device (2).

7. The gravel gravity energy storage device according to claim 5, wherein the gravel blocks (3) are stacked layer by layer from the ground, and the height difference is formed by stacking the gravel blocks (3) on each other layer by layer.

8. An energy storage method of a gravel gravity energy storage device is characterized by comprising the following steps:

transporting sand in the sand pile (1) to a sand filtering device (2), and filtering sand by using a screen mesh in the sand filtering device (2);

pouring the filtered sand into regular cube blocks, and packaging to form a sand block (3);

one end of a mooring rope on the lifting device (4) is connected with the electric power generation integrated machine, the other end of the mooring rope is connected with the mechanical arm (7), clamping grooves (5) are formed in the upper parts of the front and rear faces of the gravel building blocks, and clamping heads of the mechanical arm (7) are positioned through the magnetic attraction device and clamp the clamping grooves (5);

when the fluctuation of a new photovoltaic wind power energy base (9) is excessive or the power generation amount exceeds the power grid power utilization load (9), redundant wind power or solar photovoltaic power generation is supplied to an electric power generation integrated machine (6), and gravel blocks (3) are stacked from bottom to top in situ into a high tower to store gravitational potential energy through a cable and a mechanical arm (7) of a lifting device (4);

when the power consumption peak period or the power generation capacity can not meet the power grid power consumption load (9), the lifting device (4) carries the gravel building blocks (3) to fall from top to bottom to release gravitational potential energy, the other end of a mooring rope connected with the lifting device (4) is connected with the motor generator integrated machine (6), and the gravity acting of the gravel building blocks is utilized to drive the generator to generate power.

9. The energy storage method according to claim 8, wherein the hoisting device (4) is taken as the center, the gravel blocks (3) are piled up in a divergent way from the center to form block units, a certain gap is reserved between each block unit for the mechanical arm to clamp in, and the piled up surfaces without clamping grooves are closely arranged without gaps.

10. Energy storage method according to claim 8, characterized in that the gravel blocks (3) are stacked layer by layer from the ground, with the height difference being formed by stacking the gravel blocks (3) themselves layer by layer.