Weak wind energy gathering steady power generation method

Abstract

The invention provides a weak wind energy gathering steady power generation method, which comprises the following steps of: connecting a small wind wheel with an air compressor, manufacturing a plurality of wind power compressors into a wind gathering string, suspending the wind gathering string in the air, introducing generated compressed air into an air storage tank through an air collecting pipe, storing the compressed air in the air storage tank, and releasing the compressed air to drive an air engine generator to generate power constantly and stably. The power is supplied to power grids or electric appliances. According to the method, land resources such as farmlands are not occupied, normal production such as agricultural machinery operation is not hindered, and stable power generation can be achieved through weak wind of 0.4-0.9 m / s.

Description

Technical Field

[0001] The present application belongs to the technical field of weak wind power generation and agricultural production, and specifically relates to a method for weak wind energy gathering and stable power generation. Background Art

[0002] On December 24, 2019, Nantong University of Technology proposed a patent for "A distributed power supply system based on a wind-solar complementary power generation tree (CN210807131U)", which includes multiple power supply components distributed in various places, each of which includes: a power generation tree, the power generation tree includes: a base, a main shaft vertically arranged on the base, a primary bracket arranged on the main shaft, and an axially rotatable wind wheel, a magnetic levitation wind turbine and a photovoltaic power generation panel. The wind wheel, the magnetic levitation wind turbine and the photovoltaic power generation panel are all arranged on the primary bracket, and the magnetic levitation "wind turbine" is arranged at the rotating axis of the wind wheel. The current generated by the rotation of the wind wheel charges the energy storage device; the energy storage device is electrically connected to the magnetic levitation wind turbine and the photovoltaic power generation panel to store the electric energy generated by the rotation of the wind wheel and the electric energy generated by the photovoltaic power generation panel; the charging pile is electrically connected to the energy storage device to power the load. On August 4, 2021, State Power Investment Corporation (Guangdong) Comprehensive Smart Energy Innovation Research Institute Co., Ltd. proposed a "Breeze Power Tree Device and Wind Turbine Blades (CN113790125A)", which arranges a large number of "wind turbine" units on the breeze power tree, which can continuously provide power in various wind direction environments, and has a small footprint and simple structure, and also ensures the continuity and stability of power generation. On November 6, 2018, Hefei University of Technology proposed a "Wind Power Tree System (CN209654170U)". It arranges multiple micro "wind turbines" in a tree structure. Since each wind turbine is small in size, the blades can rotate in a breeze to generate electricity. On November 15, 2018, the Inner Mongolia Power Machinery Research Institute proposed a "Breeze Power Generation System (CN109340051A)", which is a tree-shaped breeze power generation system, including a power generation structure, an electrical control system, a battery, a number of axially rotatable wind wheels and a magnetic levitation wind turbine; it only needs a breeze to drive power generation, and its power generation efficiency is much higher than that of traditional wind turbines, effectively solving the problems existing in the above-mentioned traditional wind turbines and existing breeze power generation equipment.

[0003] With the continuous development of wind power technology, larger impeller diameters and taller towers have become the main trend of wind power development. The tower height of megawatt-class wind turbines is generally more than tens of meters, or even more than one hundred meters. As the height increases, the manufacturing cost of the tower increases significantly. However, the initial investment of such megawatt-class wind turbines is very high, often tens of millions, and the site selection requirements are high. They are generally installed on the top of a mountain with strong winds, and will not be installed in low-lying areas and valleys with weak winds. The applicant's prior application "Photovoltaic power generation method and photovoltaic power generation cable at high altitude of cultivated land (CN117792235A)" provides a method and photovoltaic power generation cable for photovoltaic power generation at high altitude of cultivated land. "A suspension bridge support structure for vertical axis wind turbines in offshore wind farms (CN208669528U)" realizes the one-time installation of multiple vertical axis wind turbines through the joint cooperation of the main cable, the boom and the lower chord, realizes the increase of installed capacity per unit area, and greatly reduces the construction cost of wind turbines in wind farms. On August 10, 2018, China News Network published an article titled "36% of the world's icebergs will melt, and wind power will become the savior." The article showed the application scenarios of the small vertical axis wind turbines that the NPC team has selected and will be promoted around the world (see attached). Figure 7 ).

[0004] To sum up, the vigorous development of wind power requires the occupation of a large area of ​​land resources. However, relevant departments stipulate that the deployment of wind power and photovoltaic facilities in cultivated land and permanent basic farmland must adopt the complementary mode of agricultural photovoltaic and wind-agriculture. In principle, the spacing between pile foundations should be greater than 4 meters and the spacing between rows should be greater than 10 meters. Except for the land for pile foundations, it is strictly forbidden to harden the ground and destroy the arable layer. The purpose is to strictly adhere to the 1.8 billion mu of cultivated land red line and strictly implement the cultivated land protection system. Specifically, due to the nature of cultivated land, the current agricultural land does not allow large-scale and high-density installation of wind turbines.

[0005] The applicant's "Farmland Wind Power Complementary System (CN118375564A)" proposes a series of wind power generation strings composed of a large number of lightweight micro wind turbines; the wind power generation strings are suspended above the ground such as farmland through cables. The system does not occupy land resources such as farmland, and does not hinder normal production such as agricultural machinery operations. However, in more than half a year of implementation practice, the following two deficiencies were found: First, weak winds below 1.5 meters per second cannot start its wind turbine to generate electricity (the reason is that cutting magnetic lines of force requires a higher speed to generate electricity, and the current small vertical axis generators do not have a speed change mechanism); second, weak winds are extremely unstable, sometimes there and sometimes not, and intermittently, making it difficult to generate electricity in series and parallel, and it is difficult to continuously supply stable electricity to the power grid.

[0006] Data from the AI ​​large model shows that weak wind (also known as soft wind) belongs to Level 1 wind, with a wind speed of about 1.6-3.3 kilometers per hour, or 0.4-0.9 meters per second, which can slightly blow smoke and leaves. Summary of the invention

[0007] The purpose of this application is to provide a method for weak wind energy gathering and stable power generation, so that even a weak wind of 0.4-0.9 m / s can be started and stable power generation can be achieved; in order to improve the utilization efficiency of land resources such as farmland / forestland / pastureland, promote the development of renewable energy, and open up a broad new world where wind power generation does not hinder agricultural ( / forestry / animal husbandry) production.

[0008] In order to achieve the above-mentioned purpose of the invention, the present application provides a method for steady power generation by weak wind energy gathering as follows.

[0009] The present application provides a method for generating electricity by focusing energy in weak wind, which is characterized by comprising the following steps: ① Connect a (micro / small) vertical axis wind wheel to a (micro / small) air compressor, and use the vertical axis of the wind wheel to transmit the torque to the air compressor to make a (micro / small) wind compressor (directly driven by wind power); ② Connect n wind compressors in series with load-bearing cables to form a wind compressor string - a wind gathering string, where n ≥ 5 or 10 or 25 or 50 or 100 or 200; ③ Hang the wind gathering string and the gas collecting pipe in the sky between two columns, where the string height H≥4m or 8m or 15m or 30m or 50m, and the string span L≥20m or 50m or 80m or 150m or 500m; ③ Connect the air outlets of each wind compressor to the air collecting pipe respectively, and collect the compressed air through the air collecting pipe and pass it into the air storage tank (located on the ground) for storage; ④ Constantly release the compressed air in the air tank and drive the air engine generator to generate electricity steadily for the power grid or electrical appliances.

[0010] Preferably, the method for generating electricity by gathering energy from weak wind is characterized by connecting multiple wind compressors in series through an air collecting pipe, and increasing the pressure of the compressed air stored in the air storage tank by multi-stage compression. In this way, the technical effect of accumulating weak energy into strong energy, starting with weak wind, and generating electricity steadily can be achieved.

[0011] Preferably, the weak wind energy gathering and stable power generation method is characterized in that: the wind gathering string and the gas collecting pipe are hung together above the ravine, and the mountain peak is used as a support such as a pillar (according to local conditions). Studies have shown that because the mountains on both sides of the valley have a wind-guiding effect, the wind speed above the valley is faster than the top of the mountain, the wind force is stronger than the top of the mountain, and the wind energy is greater than the top of the mountain, making it more suitable as a wind energy collection site.

[0012] Preferably, the weak wind energy gathering and stable power generation method is characterized in that: the wind gathering string and its air collecting pipe (one end or both ends) are hung on the tower of a large wind turbine. For example, the wind gathering string and its air collecting pipe are hung in the air between two (currently megawatt-class) large wind turbines. In this way, the tower and other columns can be shared, and new wind power resources can be mined at a very low cost, making up for the deficiency that the current megawatt-class large wind turbines cannot generate electricity when the wind is weak.

[0013] Preferably, the weak wind energy gathering and stable power generation method is characterized by: hanging x wind gathering strings together with the gas collecting pipe above the farmland and pulling a certain distance k apart, wherein k≥3m or 5m or 10m or 20m or 50m, x≥2 strings / mu, or 3 strings / mu, or 5 strings / mu, or 10 strings / mu, or 20 strings / mu, or 50 strings / mu.

[0014] It should be noted that the reason for using numerous lightweight micro wind-gathering strings suspended in the air is to increase the span, increase the height, increase the windward area, facilitate construction and installation, avoid interfering with agricultural machinery operations, maximize the use of wind energy resources above the land, and avoid the loss of wind energy from limited land resources.

[0015] Preferably, the weak wind energy gathering and steady power generation method is characterized in that: the weight of a single wind compressor is ≤100kg or 50kg or 30kg or 15kg; the density of wind compressors in the same wind gathering string is ≥20 or 30 units / 100 meters.

[0016] Preferably, the weak wind energy gathering and stable power generation method is characterized in that the wind gathering string is suspended together with the gas collecting pipe and the irrigation water pipe above the farmland between two columns, thereby sharing the load-bearing cables and columns.

[0017] Compared with the prior art, the present application has the following beneficial technical effects.

[0018] First, although it is a dense group of wind turbines, it does not occupy land resources such as farmland, forest land, pasture land, and does not hinder normal agricultural production such as agricultural machinery operations. The wind-gathering string in this application, like high-voltage wires, basically does not occupy farmland (the pile foundation can be set on the ridge, in the ditch, and on the side of the road according to local conditions), the suspension cable has a large span, high height, small shadow, and does not affect crop growth and yield. Figure 7 If the wind turbines are used in the application scenarios, it will occupy a large amount of land resources such as farmland, hindering agricultural production. The relevant departments do not allow the dense installation of wind turbines in farmland.

[0019] Second, one land for two uses, wind and agriculture complement each other. The most beneficial technical effect of this application is that it cleverly develops and uses the surplus wind energy resources above the land, which can improve the single agricultural, forestry and animal husbandry use of the land, increase the value of the land, alleviate the contradiction of tight land use for wind power, and promote the innovative development of complementary agriculture, forestry and animal husbandry with clean energy. However, wind turbines such as wind turbines are not allowed to be installed in farmland, and most of the wind resources passing over the farmland will be lost in vain and not fully exploited.

[0020] Third, electricity can be generated above the valley, opening up new wind power resources. Currently, large wind turbines are generally installed on mountain tops, not in low-lying valleys. However, this application can suspend the wind-gathering string high in the valley between two mountains, thereby exploring new wind power sites with greater wind energy.

[0021] Fourth, weak wind can start power generation: weak wind of 0.4-0.9 m / s can also start and generate electricity steadily. In particular, after adopting a series of micro / small wind compressors directly driven by wind power, and adopting technical measures such as multi-stage series air boosting, the technical effect of accumulating weak power into strong power, and starting and generating electricity steadily with weak wind can be achieved. It overcomes the two shortcomings of the applicant's prior application "Farmland Wind Power Complementary System (CN118375564A)" that "weak wind below 1.5 m / s cannot start power generation" and "it is difficult to generate electricity steadily". BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the application of a weak wind energy gathering and stable power generation method and system on a piece of cultivated land in the present application (Example 1).

[0023] Figure 2 for Figure 1 A schematic diagram of the structure of a direct-drive wind compressor used in.

[0024] Figure 3 for Figure 1 A schematic diagram of the structure of another direct-drive wind compressor used in.

[0025] Figure 4 This is a schematic diagram of the application of a wind gathering string in the present application (Example 2) hanging above a valley.

[0026] Figure 5 Schematic diagram of the application of a wind gathering string in the present application (Example 3) suspended between two megawatt-class large wind turbine towers.

[0027] Figure 6 This is a schematic diagram of the application of three groups of wind-gathering strings suspended above farmland in the present application (Example 4).

[0028] Figure 7 This is a diagram of an application scenario of a current vertical axis wind turbine group.

[0029] Explanation of the accompanying numbers: 1-vertical axis wind wheel, 2-air compressor, 3-wind compressor, 4-air outlet, 5-load-bearing cable, 6-column, 7-stayed cable, 8-gas collecting pipe, 9-gas storage tank, 10-air engine generator, 11-power grid, 12-wind gathering string, 13-megawatt-class large wind turbine, 14-air inlet. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by this application easy to understand, this application is further explained below in conjunction with specific implementation methods.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0032] It should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "communication", etc. should be understood in a broad sense. For example, "communication" can mean electrical communication or direct connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] Embodiment 1.

[0034] like Figure 1 , Figure 2 , Figure 3 As shown, in the air above a piece of cultivated land (such as a wheat field, a vegetable field, a corn field, or an orchard), two upper and lower load-bearing cables 5 are set up in the north-south direction at a height of 10-50 meters from the ground and at a distance of 5 meters.

[0035] The first step is to purchase n (for example, 50) small wind wheels 1 with vertical axes, such as wind wheels 1 with a diameter of 1.6m and a weight of 50kg, and a small air compressor 2 that matches it, connect the wind wheel 1 to the air compressor 2, and make a (micro / small) wind compressor 3 (directly driven by wind power), and use the vertical axis of the wind wheel 1 to transmit the torque to the air compressor 2. Test experiments have found that the use of screw compressors and piston compressors in volumetric compressors is the most ideal. These two types of air compressors 2 have high efficiency and stability, and can meet the pressure and flow requirements of the air energy storage system. Then purchase a batch of high-tensile strength steel cables greater than 1200 MPa as load-bearing cables 5, such as galvanized prestressed steel cables of φ17.2×3 as load-bearing cables 5.

[0036] The second step is to make the upper and lower cables 2.6m apart and hang them above the cultivated land through tall supports such as columns and cable towers (similar to electric towers / poles) higher than 20 meters, just like erecting high-voltage transmission lines. The height of the lower cable from the ground can be set to about 15 meters, the span of its single span can be set to 120 meters, and the distance K between the horizontal projections of the lower cable and the upper cable (on the cultivated land) is preferably set to more than 10 meters. For example, the string height H can be set to ≥ 20m or 30m or 50m. In short, the string height H should be high enough to ensure that the top of the crop does not touch the lower cable. The string span L can also be set to ≥ 20m or 50m or 100m or 500m or 1000m. In short, the string span L should be large enough to reduce the number of tall supports such as columns 6, reduce the area occupied by pile foundations, and avoid serious obstruction of large agricultural machinery operations. It is best to set the spacing K to ≥ 5m or 10m.

[0037] The third step is to install 50 small wind compressors 3 with vertical axes in a row between the upper and lower cables to form a wind compressor 3 string - a wind gathering string 12.

[0038] The fourth step is to hang the wind gathering string 12 and the gas collecting pipe 8 in the sky between the two columns 6, wherein the string height H is ≥ 4m or 8m or 15m or 30m or 50m, and the string span L is ≥ 20m or 50m or 80m or 150m or 500m.

[0039] The fifth step is to connect the air outlets 4 of each wind compressor 2 to the air collecting pipe 8 in parallel, and pass the (generated) compressed air (collected) into the air storage tank 9 (located above the ground) through the air collecting pipe 8 for storage. It is best to connect multiple wind compressors 3 in series with the air collecting pipe 8, connect the air outlet 4 of the previous wind compressor 3 with the air inlet 14 of the next wind compressor 3, and increase the pressure of the compressed air stored in the air storage tank 9 through multi-stage compression. In this way, the technical effect of accumulating weak to strong, starting even with weak wind, and stable power generation can be achieved.

[0040] The sixth step is to release the compressed air in the air storage tank 9 steadily when there is no wind or when electricity is needed, and drive the air engine generator 10 to generate electricity steadily to supply the power grid 11 or electrical appliances.

[0041] Step 7. In order to stabilize the tall supports such as the columns 6, necessary facilities such as the inclined cables 7 and wind-resistant inclined cables should be added according to the convention.

[0042] Preferably, in order to improve land utilization efficiency and maximize the development of wind energy, multiple layers of multi-wind strings 12 (not shown) can be hung between the same group of columns 6 and other tall supports.

[0043] Embodiment 2.

[0044] like Figure 4As shown, referring to the steps in the above example, the wind collection string 12 and its gas collecting pipe 8 are suspended in the air between two mountains. Because the current megawatt-class large wind turbines 13 have high site selection requirements, they are generally installed on the top of the mountain with strong winds, and will not be installed in low-lying places and valleys with weak winds. In other words, the wind collection string 12 and its gas collecting pipe 8 can be suspended above the valley to turn the valley and other gullies into a new wind power site where the wind collection string 12 and its gas collecting pipe 8 can be installed.

[0045] Embodiment three.

[0046] like Figure 5 As shown, referring to the above steps, the wind collection string 12 and its air collecting pipe 8 are suspended in the air between two (current) megawatt-class large wind turbines 13. In this way, the tower and other columns 6 can be shared, and new wind power resources can be mined at a very low cost to make up for the deficiency that the current megawatt-class large wind turbines 13 cannot generate electricity when the wind is low.

[0047] Embodiment 4.

[0048] In order to improve land use efficiency, maximize the development of wind energy and avoid wasting passing wind energy, such as Figure 6 As shown, a wind gathering string 12 can be installed at a certain distance K (e.g., 10 meters) above the same piece of hundreds of acres of cultivated land. For example, 2 strings, 3 strings, 5 strings, 10 strings, 20 strings, or 50 strings can be installed per acre.

[0049] In this way, crops on arable land can still be cultivated or grown as usual.

[0050] What is disclosed above is only a preferred embodiment of the present application. The drawings are merely schematic structural diagrams and are not drawn according to the actual size ratio. They cannot be used to limit the scope of rights of the present application. Equivalent changes made based on the claims of the present application still fall within the scope covered by the present application.

Claims

1. A method for steady power generation by weak wind energy gathering, characterized in that: It includes the following steps: ① Connect the vertical axis wind wheel to the air compressor, and use the vertical axis of the wind wheel to transmit the torque to the air compressor to make a wind compressor; ② Connect n wind compressors in series with load-bearing cables to form a wind compressor string - a wind gathering string, where n ≥ 5 or 10 or 25 or 50 or 100 or 200; ③ Hang the wind gathering string and the gas collecting pipe in the sky between two columns, where the string height H≥4m or 8m or 15m or 30m or 50m, and the string span L≥20m or 50m or 80m or 150m or 500m; ③ Connect the air outlets of each wind compressor to the air collecting pipe respectively, and pass the compressed air into the air storage tank through the air collecting pipe for storage; ④ Constantly release the compressed air in the air tank and drive the air engine generator to generate electricity steadily for the power grid or electrical appliances.

2. The weak wind energy gathering and stable power generation method according to claim 1 is characterized in that: Multiple wind compressors are connected in series using an air collecting pipe, and the pressure of the compressed air stored in the air tank is increased through multi-stage compression.

3. The weak wind energy gathering and stable power generation method according to claim 1 is characterized in that: The wind gathering string and the gas collecting pipe are hung together above the gully; or, the wind gathering string and the gas collecting pipe are hung on the tower of a large wind turbine.

4. The weak wind energy gathering and stable power generation method according to claim 1 is characterized in that: Hang x wind-gathering strings together with the gas collecting pipe above the farmland and space them apart at a certain distance k, where k ≥ 3m or 5m or 10m or 20m or 50m, and x ≥ 2 strings / mu or 3 strings / mu or 5 strings / mu or 10 strings / mu or 20 strings / mu or 50 strings / mu.

5. The weak wind energy gathering and stable power generation method according to claim 1 is characterized in that: The weight of a single wind compressor is ≤100kg or 50kg or 30kg or 15kg; the density of wind compressors in the same wind gathering string is ≥20 or 30 units / 100 meters.

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