Sand heat storage type wind-powered electricity generating device

Abstract

The objective of the present invention is to provide a sand heat storage type wind-powered electricity generating device which: includes a sand-based material containing silica sand, a type of silica sand, or a type of sand, in a sand container, and a wind tunnel; is provided with a wind turbine and a wind-powered electricity generator; and performs wind-powered electricity generation by means of an ascending air current in the wind tunnel. In this sand heat storage type wind-powered electricity generating device, heat is stored as thermal energy in a sand-based material by means of heating by a heater from external electric power such as surplus electric power, heating by means of a heat exchanger, heating by means of a thermal conductor, thermal heating, dry steam heating, solar heating and the like, and in a demand for electric power when electric power is required externally, the thermal energy causes an ascending air current to flow with an air flow rate related to a temperature difference between air inside and outside the wind tunnel resulting from an increase in the temperature of the air inside the wind tunnel, a height difference between the positions of the wind tunnel openings, and the effective area of the wind tunnel openings, the ascending air current acts to drive the wind turbine, and electric power is generated by a wind-powered electricity generator that is being driven by the wind turbine.

Description

Sand thermal storage wind power generation equipment

[0001] The present invention relates to a sand heat storage type wind power generation device, characterized in that it has a sand base material that stores thermal energy in a sand container and a wind tunnel, allows heat to be stored in the sand base material in the sand container from the outside, drives a wind turbine by the warm air rising current in the wind tunnel, generates electricity using a wind power generator driven in conjunction with the wind turbine, and is configured to output electricity to the outside when electricity is needed, or to be able to output electricity to the outside using a heat exchanger.

[0002] Patent Document 1 describes the wind power generation device as follows: a wind tunnel installed in the extension direction, a plurality of wind intakes provided on the peripheral wall of the cylindrical member for guiding the wind collected by the wind collecting plates into the wind tunnel, and a turbine provided between adjacent wind collecting plates that is driven by the wind collected by the wind collecting plates.

[0003] Patent Document 2 describes a rotating blade for an axial flow turbine wind turbine, which is characterized in that the rotating blade has a shape in which multiple blade flats extend from a circular, flat wheel plate, the thickness of the rotating blade is uniform overall, and a curved plate member that is open on the downwind side and has an arc-shaped cross section is attached to the leading edge of each blade flat in the rotation direction.

[0004] Furthermore, Patent Document 3 states that by attaching the blade so that a negative angle β is formed between the airflow W2 onto the blade and the plane corresponding to the ninth line segment of the blade, it is possible to add a negative pressure due to the negative angle β to the lift force explained by Bernoulli's theorem. Therefore, it is possible to obtain a large torque and increase the efficiency of the wind turbine.

[0005] Furthermore, Patent Document 4 describes a vertical axis wind turbine equipped with a lift-type wind turbine and a drag-type wind turbine whose rotation axes are concentric. More specifically, it describes a vertical axis wind turbine equipped with a lift-type wind turbine and a drag-type wind turbine, which can generate high torque by utilizing the surface effect in addition to the Magnus effect, and can therefore achieve high rotational efficiency despite its small size.

[0006] Furthermore, Patent Document 5 describes a wind power generation device that utilizes the characteristics of the Savonius blades when starting rotation or when there is a light breeze, and that can efficiently convert the rotational energy of the Darrieus blades and Savonius blades into electrical energy regardless of the wind speed.

[0007] Republished 2008 / 0756766 Patent Publication No. 2012-241705 Patent Publication No. 06-159222 Patent Publication No. 6165303 Patent Publication No. 2007-107496

[0008] Patent Document 1 discloses a wind power generation device that includes a wind tunnel installed in the extension direction, multiple wind intakes provided on the peripheral wall of the cylindrical member to guide the wind collected by the wind collecting plates into the wind tunnel, and a turbine-type wind power generation device that is provided between adjacent wind collecting plates and is driven by the wind collected by the wind collecting plates.However, the wind tunnel with multiple wind intakes has a complex configuration and is directly affected by external wind (such as wind dust), so construction costs and maintenance costs are high and maintenance work is expected to be difficult.

[0009] Patent Documents 2, 3, and 4 do not describe wind power generation methods. Patent Document 5 describes a Savonius wind power generation device in which Savonius blades are attached to a rotating rotor shaft, in which a shaft hole is provided along the central axis of the rotor shaft from the bottom end to a predetermined length, a hollow shaft outer rotor type generator is attached to the bottom end of the rotor shaft, and a vertically standing utility pole or support is fitted into the shaft hole through the utility pole hole in the fixing frame of the hollow shaft outer rotor type generator, with the upper end supported by a bearing, and describes the attachment of the generator.

[0010] The present invention provides a wind power generator that is connected to and driven by a sand-based material containing silica sand, silica sands, or sands, a wind tunnel, a sand container that stores the sand-based material, a wind tunnel front chamber connected to the wind tunnel, a wind turbine installed in the wind tunnel and / or the wind tunnel front chamber, and a wind power generator that is connected to and driven by the wind turbine, wherein the sand-based material stores heat as thermal energy, and when external power is required, the thermal energy causes an increase in the temperature of the air in the wind tunnel, which generates an updraft that drives the wind turbine, and the wind power generator is driven in conjunction with the wind turbine. The sand thermal storage wind power generation device of the present invention is characterized in that it is configured to generate power using the wind power generator connected to the wind power generator, and since the wind turbine is installed in the wind tunnel and / or in the wind tunnel front room and the wind power generator is connected to and driven by the wind turbine, power can be generated even with a weak wind flow velocity in the wind tunnel, damage is reduced, replacement frequency is low, damage from lightning and the like is unlikely, the cost of thermal storage materials is low, construction costs and maintenance costs are low, the installation site can be adjacent to a demand area, and it can help reduce power transmission costs. The investment amount relative to the amount of power generated is low. The purpose is to provide these effectively.

[0011] The sand thermal storage wind power generation device according to the present invention comprises: a sand-based material containing silica sand, silica sands, or sands; a wind tunnel having an upper opening and a lower opening; a sand container arranged around the side wall of the wind tunnel and storing the sand-based material; a wind tunnel antechamber having an air inlet and connected to the wind tunnel; a wind turbine installed in the wind tunnel and / or the wind tunnel antechamber; and a wind power generator connected to and driven by the wind turbine; wherein the sand-based material stores heat as thermal energy obtained by heating using at least one of heating from external power such as surplus electricity using a heater, heating using a thermal conductor, heating using a heat exchanger, thermal heating using a steam pipe, dry steam heating, or solar radiation heating; When external electricity is required, the wind turbine is driven by an updraft of air volume related to the temperature difference between the inside and outside of the air in the wind tunnel, which is caused by the heat energy stored in the sand base material causing the temperature of the air in the wind tunnel to rise, the elevation difference of the position of the opening of the wind tunnel, and the effective area of ​​the opening of the wind tunnel, and electricity is generated by the wind power generator which is driven in conjunction with the wind turbine.

[0012] Furthermore, in the sand thermal storage wind power generation device according to the present invention, the sand base material stores heat as thermal energy obtained by at least one of heating using a heater that uses electricity generated by the wind power generator, heating using a heater from external electricity such as surplus electricity, heating using a thermal conductor, heating using a heat exchanger, thermal heating using a steam pipe, dry steam heating, or solar radiation heating, and when external electricity is required, the thermal energy stored in the sand base material can be output to the outside by the heat exchanger or thermal conductor.

[0013] Furthermore, in the sand thermal storage wind power generation system according to the present invention, the wind turbine may be a horizontal axis wind turbine or a vertical axis wind turbine, and may have at least one of a limit load fan, a turbine wind turbine, a Bernoulli theorem wind turbine, a propeller wind turbine, a cell wing wind turbine, a multi-blade wind turbine, a Magnus wind turbine, a Darrieus wind turbine, a Savonius wind turbine, a Gyaromill wind turbine, a cross-flow wind turbine, a Sirocco fan, a turbo fan, a line fan, or an S-type wind turbine.

[0014] and a drainage and dust removal section on a lower surface of the wind tunnel front chamber, the drainage and dust removal section being configured to drain water and remove dust. The wind tunnel front chamber has a wind tunnel front chamber opening which has a lid which covers a part of the wind tunnel front chamber and is openable and closable, the wind tunnel front chamber opening can be closed by the lid except when the wind turbine or the wind power generator is being installed or maintained / inspected, the wind tunnel front chamber has a wind inlet, a wind inlet chamber and a wind inlet lid on its upper side, the height of the wind inlet is set so as to prevent water and dust from entering from the outside, and the wind inlet lid of the wind inlet can be opened and closed to adjust the amount of wind entering and is configured to allow air to enter from the outside as needed, the wind tunnel front chamber has a wind inlet on its side surface and a drainage and dust removal section on its lower side, the wind inlet on the side surface is set so as to allow air to enter from the outside as needed, and the drainage and dust removal section is configured to allow drainage and dust removal.

[0015] Furthermore, the sand thermal storage type wind power generation device according to the present invention may be characterized in that the silica sand or silica sand-like material that is the sand base material is heated to 1000°C or higher, thereby enabling heat storage at high temperatures.

[0016] Furthermore, in the sand thermal storage wind power generation device according to the present invention, the means for storing heat from the outside in the sand base material in the sand container, which is silica sand, silica sands, or sands containing sands, may be heating by a heater, heating by a heat energy exchanger or other device that exchanges heat, heat conduction by a thermal conductor such as aluminum, aluminum alloy, silicon carbide, gallium nitride, or copper, heating by a heating steam pipe as steam heating, or dry steam heating.

[0017] Furthermore, in the sand thermal storage wind power generation device according to the present invention, when there is no need to output electric power to the outside, the air inlet lid of the air inlet can be closed, thereby increasing the thermal energy storage capacity of the sand base material and raising the temperature of the air in the wind tunnel to a higher temperature.

[0018] Furthermore, in the sand thermal storage wind power generation device according to the present invention, the outer surface of the sand container that stores the thermal energy may be made of a material with good thermal insulation, such as insulating steel, insulating concrete, or insulating cement, and the inner surface of the sand container that stores the thermal energy may be made of a material with good thermal conductivity, such as aluminum, aluminum alloy, silicon carbide, gallium nitride, or copper, which is a thermal conductor.

[0019] Furthermore, in the sand thermal storage wind power generation device according to the present invention, the sand base material may be heated by a heater, a heat conductor, a heat exchanger, thermal heating through a steam pipe, or dry steam heating using electricity from wind power generation, solar power generation, geothermal power generation, thermal power generation, hydroelectric power generation, nuclear power generation, etc., and the sand base material containing thermal energy is stored in the sand container made of insulating concrete, and when electricity demand is high, the thermal energy can be output as electricity to the outside by the wind power generator, the heat exchanger, or the thermal conductor.

[0020] Furthermore, in the sand thermal storage wind power generation device of the present invention, the wind volume Q due to the ascending air current may be treated in relation to the product of the square root value of the product of the height H of the wind tunnel and the temperature difference T between the inside and outside of the air in the wind tunnel and the effective area A of the opening of the wind tunnel, and when there is a temperature difference between the inside and outside of the air in the wind tunnel, a density difference occurs in the air in the wind tunnel, which in turn creates a pressure difference between the inside and outside, thereby generating an ascending air current.

[0021] Furthermore, in the sand thermal storage wind power generation system according to the present invention, the limit load fan is a type of centrifugal blower with characteristics intermediate between a sirocco fan and a turbo fan, and there are two types of limit load fans depending on the shape of the impeller blades: LLA type: The blades are airfoil-shaped, making them low noise and highly efficient; LLB type: The blades are flat, making them resistant to high temperatures and humidity and corrosion-resistant; and the limit load fan is characterized by the fact that its axial power does not exceed a certain value, so no overload occurs and high static pressure efficiency is obtained; In this invention, wind power generation fluctuates when the wind speed in the wind tunnel fluctuates. To withstand overload, a fan with a constant shaft power, such as a limit load fan, is suitable. A limit load fan's shaft power does not exceed a certain value even when the air volume or wind pressure changes. This prevents overload on the wind turbine and wind power generator, enabling stable power generation. Furthermore, limit load fans may be characterized by having high static pressure efficiency, which is the ratio of the fan's input energy to its output energy. The higher the static pressure efficiency, the better the fan's performance. Sirocco fans, also known as multi-blade fans, are fans with multiple blades attached in the direction of rotation. Long, thin, plate-like blades are attached in a cylindrical shape, and rotating these blades draw in and exhaust air.

[0022] Furthermore, in the sand thermal storage wind power generation system according to the present invention, the horizontal axis wind turbine must remain parallel to the changing wind direction; the lift type includes a propeller wind turbine and a ribbon wind turbine, and the drag type includes a multi-blade wind turbine, a cell wing wind turbine, a wind turbine, and a Dutch wind turbine; Vertical axis wind turbines include the Darrieus turbine and the Gyromill turbine as lift types, and the Savonius turbine, the crossflow turbine, the S-type turbine, and the Patreon turbine as drag types. Vertical axis wind turbines have a rotation axis perpendicular to the wind direction, and are usually installed so that the rotation axis is perpendicular to the ground. This means that the wind always blows at a right angle to the rotation axis, eliminating the need for directional control. Darrieus turbines are shaped so that the centrifugal force acting on the blades acts as a tensile stress, and the blade pitch is fixed. Gyromill turbines (H Darrieus turbines, linear Darrieus turbines) have straight blades, which allow for variable pitch and make them easier to start even in light breezes.

[0023] Furthermore, in the sand thermal storage wind power generation system according to the present invention, an example of the vertical axis wind turbine of the wind turbine is a vertical axis wind turbine equipped with a lift wind turbine and a drag wind turbine whose rotation axes are on concentric axes, and since it is equipped with a lift wind turbine and a drag wind turbine and can generate high torque by utilizing the surface effect in addition to the Magnus effect, it may be characterized as a vertical axis wind turbine that can achieve high rotational efficiency despite its small size.

[0024] In the sand thermal storage wind power generation device according to the present invention, a plurality of the wind turbines and the wind power generators connected to and driven by the wind turbines can be installed in the wind tunnel front chamber of the wind tunnel. Also, a plurality of the wind tunnel front chambers can be provided around the wind tunnel, and a plurality of the wind power generators connected to and driven by the wind turbines can be installed.

[0025] When the axial flow wind turbine or the axial flow turbine type wind turbine is installed, the side wall of the wind tunnel has a substantially cylindrical shape.

[0026] In addition, in the sand thermal storage wind power generation system according to the present invention, the outer wall of the sand container will vary depending on the weight per heat dissipation surface and how the heat insulating material is inserted for heat retention. When storing and dissipating heat in stones, the stored thermal energy is dissipated with a significant peak time lag and peak energy attenuation.

[0027] The sand base material may also be made of dried silica sand or other sands.

[0028] The present invention is a sand thermal storage type wind power generation device in which a sand base material containing silica sand, silica sands, or sands stores heat as thermal energy by heating using a heater from external power such as surplus electricity, heating using a heat exchanger, heating using a thermal conductor, thermal heating, dry steam heating, solar heating, etc., and when external power is needed, the thermal energy stored in the sand base material causes the temperature of the air in the wind tunnel to rise, resulting in an updraft of air of an amount related to the temperature difference between the inside and outside of the air in the wind tunnel, the elevation difference between the position of the opening of the wind tunnel, and the effective area of ​​the opening of the wind tunnel, which acts to drive a wind turbine and generates electricity using the wind power generator driven by the wind turbine.

[0029] Fig. 1 shows an example of a sand thermal storage type wind power generator W according to an embodiment of the present invention. Fig. 2 shows an example of a sand thermal storage type wind power generator W2 according to an embodiment of the present invention.

[0030] Hereinafter, embodiments of the present invention will be described.

[0031] According to the literature, effective energy storage technology is essential for effectively utilizing intermittent renewable energy sources such as solar and wind power. Surplus electricity from solar and wind power drives a heater, heating the thermal storage material, silica sand, to 1,200°C. The sand containing the thermal energy is then stored in the insulated concrete sand container. When electricity demand is high, the sand is output from a heat exchanger to generate electricity, and when electricity rates are low, the sand base material is heated again to store the energy. The system's baseline capacity is estimated to be up to 26,000 MWh of thermal energy. This system boasts advantages of low cost, high efficiency, and safety. Furthermore, silica sand is an inert material, making it suitable for long-term storage of large amounts of energy. There are no particular restrictions on installation location, and it can be installed anywhere, including vacant lots, high altitudes, and cold regions. Storage capacity can also be adjusted relatively easily. Converting renewable electricity into heat also enables decarbonization.

[0032] Furthermore, when the sand-based material is used to store and release heat, the stored heat energy is released with a significant peak time lag and peak energy decay. This varies depending on the weight per heat-receiving surface and the type of insulation used for heat retention. For example, if one side of a 10 cm thick pile of solid marble is heated, the peak heat release from the other side will occur with a time lag of roughly 7 hours. In this case, the decay rate is said to be just under 50% of the peak input heat energy without insulation.

[0033] The present invention will now be described in detail with reference to a wind power generator that utilizes the ability of sand-based materials to store large amounts of thermal energy.

[0034] In the sand thermal storage wind power generation device of the present invention, the air volume Q due to the ascending air current is treated in relation to the product of the square root of the product of the height H of the wind tunnel and the temperature difference T between the inside and outside of the air in the wind tunnel, and the effective area A of the opening of the wind tunnel, and when there is a temperature difference between the inside and outside of the air in the wind tunnel, a density difference occurs in the wind tunnel, which in turn creates a pressure difference between the inside and outside, thereby generating an ascending air current. Furthermore, the sand base material containing silica sand, silica sands, or sands that stores thermal energy according to the present invention constitutes the dried sand base material.

[0035] As an embodiment of the present invention, the sand thermal storage type wind power generating device W is shown in conceptual diagram 1 and conceptual diagram 2 as a product configuration. The sand thermal storage wind power generation device W according to the present invention comprises: a sand-based material 3 containing silica sand, a type of silica sand, or a type of sand; a wind tunnel 6 having an upper opening 4 and a lower opening 5; a sand container 1 arranged around the side wall of the wind tunnel 6 and storing the sand-based material 3; a sand container installation section 2; a wind tunnel front chamber 9 having an air inlet 71 and connected to the wind tunnel 6; a wind turbine 8, 81, 85, or 86 installed in the wind tunnel 6 and / or the wind tunnel front chamber 9; and a wind power generator 10, 11, 15, or 16 connected to and driven by the wind turbine; and the sand-based material 3 stores heat as thermal energy obtained by heating using at least one of heating by a heater 18 from external power such as surplus electricity, heating by a heat conductor, heating by a heat exchanger 17, warm heating by a steam pipe, dry steam heating, and solar radiation heating. When external power is required, the wind turbine is driven by an updraft of air related to the temperature difference between the inside and outside of the air in the wind tunnel 6, the temperature difference between the inside and outside of the air in the wind tunnel 6, the elevation difference between the positions of the openings 4 and 5 of the wind tunnel 6, and the effective area of ​​the openings 4 and 5 of the wind tunnel 6, which is caused by the thermal energy stored in the sand-based material 3 to increase the temperature of the air in the wind tunnel 6. The sand-thermal storage wind power generator W generates power by the wind power generator driven in conjunction with the wind turbine. When external power output is not required, the sand-based material 3 can store more thermal energy by closing the wind inlet cover 73 of the wind inlet 71, thereby increasing the temperature of the air in the wind tunnel 6.

[0036] As another embodiment of the present invention, in the sand thermal storage wind power generation device W of the present invention, the sand base material 3 stores heat as thermal energy obtained by at least one of heating using a heater 18 of electric power generated by the wind power generators 10, 11, 15, or 16, heating using a heater 18 from external electric power such as surplus electric power, heating using a thermal conductor, heating using a heat exchanger 17, thermal heating using a steam pipe, dry steam heating, or solar radiation heating, and when electric power is required externally, the thermal energy stored in the sand base material 3 can be output to the outside by the heat exchanger 17 or the thermal conductor.

[0037] In one embodiment of the present invention, the wind turbines 8 and 81 are horizontal axis wind turbines, and the wind turbines 85 and 86 are vertical axis wind turbines, and the sand thermal storage wind power generator W is characterized by having at least one of a limit load fan, a turbine wind turbine, a Bernoulli wind turbine, a propeller wind turbine, a cell wing wind turbine, a multi-blade wind turbine, a Magnus wind turbine, a Darrieus wind turbine, a Savonius wind turbine, a Gyaromill wind turbine, a cross-flow wind turbine, a Sirocco fan, a turbo fan, a line fan, or an S-type wind turbine. Furthermore, depending on the wind inflow direction, the limit load fan or the like is suitable from the rotation axis of the wind turbine 86 and the wind power generator 16.

[0038] As an embodiment of the present invention, the sand thermal storage type wind power generation device W of the present invention has: a sand container 1; a sand container installation section 2; a sand base material 3 containing silica sand, silica sand-like sands, or sand-like sands; the sand container 1 containing the sand base material 3; a wind tunnel front chamber 9 having an air inlet 71 and connected to the wind tunnel 6 and extending in a direction intersecting the upper direction of the wind tunnel 6; or the wind tunnel 6 having an upper opening 4 and a lower opening 5 installed vertically from the foundation surface; the sand container 1 arranged around the side wall of the wind tunnel 6 and containing the sand base material 3; the wind tunnel front chamber 9 connected to the wind tunnel 6 and installed extending horizontally from the foundation surface; and the air inlet 71 and the air inlet chamber 72.

[0039] As another embodiment of the present invention, in the sand thermal storage wind power generator W according to the present invention, the wind tunnel front chamber openings 13, 14 of the wind tunnel front chamber 9 have lids, the lids are provided to cover a part of the wind tunnel front chamber 9 and be openable and closable, the wind tunnel front chamber openings 13, 14 can be kept closed by the lids except when the wind turbines 81, 85 or 86 and / or the wind power generators 11, 15 or 16 are being installed or maintained and inspected, the wind tunnel front chamber 9 has a wind inlet 71, a wind inlet chamber 72 and a wind inlet lid 73 on its upper side, the height of the wind inlet 71 is set so as to prevent the inflow of water and dust from outside, and the wind inlet lid 73 of the wind inlet 71 can be opened and closed to adjust the amount of wind inflow and is set so as to allow air to flow in from outside as necessary, The wind tunnel front chamber 9 has an air inlet on the side of the wind tunnel front chamber opening 14 and a drainage / dust removal section 12 on the lower side, the air inlet on the side is set to allow air to flow in from the outside as needed, and the drainage / dust removal section 12 is configured to allow drainage and dust removal, in this sand thermal storage wind power generator W. The entire upper side of the wind tunnel front chamber 9 can also be configured to be removable when installing or maintaining the wind turbines 81, 85, or 86 and the wind power generators 11, 15, or 16.

[0040] In one embodiment of the present invention, a plurality of the wind power generators 11, 15, or 16 connected to and driven by the wind turbines 81, 85, or 86 can be installed in the wind tunnel front chamber 9 of the wind tunnel 6. Also, a plurality of the wind tunnel front chambers 9 can be provided around the wind tunnel 6 (not shown).

[0041] Furthermore, as one embodiment of the present invention, in the sand thermal storage wind power generation device W of the present invention, the sand container 1 can be characterized in that its cross-sectional outer shape is approximately circular, approximately elliptical, approximately semicircular, approximately crescent-shaped semicircular, approximately triangular, approximately rectangular, or polygonal.

[0042] In one embodiment of the present invention, the wind turbine 8 or 81 is a horizontal axis wind turbine, such as a propeller wind turbine, a turbine wind turbine, a Bernoulli wind turbine, or a ribbon wind turbine, and a drag type wind turbine such as a cell wing wind turbine, a multi-blade wind turbine, a Dutch wind turbine, or a windmill type wind turbine, and drives the wind turbine to generate electricity using the wind power generator 10 or 11 driven by the wind turbine.

[0043] In one embodiment of the present invention, the wind turbine 85 or 86 is an example of a vertical axis wind turbine, and includes a Darrieus wind turbine or a Gyaromyel wind turbine as a lift type, and a crossflow wind turbine, a Savonius wind turbine, a Magnus wind turbine, a Buttle wind turbine, an S-type wind turbine, or the like as a drag type, and drives the wind turbine to generate electricity with the wind power generator 15 or 16, in the sand thermal storage wind power generation device W.

[0044] An example of the vertical axis wind turbine of the wind turbine 85 or 86 is a vertical axis wind turbine equipped with a lift type wind turbine and a drag type wind turbine whose rotation axes are on concentric axes. The vertical axis wind turbine is equipped with a lift type wind turbine and a drag type wind turbine, and is capable of generating high torque by utilizing the surface effect in addition to the Magnus effect, and therefore is capable of achieving high rotational efficiency despite its small size.

[0045] The present invention stores thermal energy in a sand-based material 3, and the wind turbines 8, 81, 85, or 86 and wind power generators 10, 11, or 16 are located within the wind tunnel 6 and wind tunnel antechamber 9, so they are less susceptible to damage, less susceptible to lightning strikes, and less frequently replaced. The cost of materials for storing heat is low, and construction and maintenance costs are low. Furthermore, power generation is possible even with weak wind speeds within the wind tunnel 6, and the installation site can be located adjacent to a demand area, helping to reduce power transmission costs. The system has features such as low investment costs relative to the amount of power generated, making it possible to implement it effectively.

[0046] REFERENCE SIGNS LIST 1 sand container 2 sand container installation section 3 sand base material 4 upper opening 5 lower opening 6 wind tunnel 71 wind inlet 72 wind inlet chamber 73 wind inlet cover 8, 81, 85, 86 wind turbine 9 wind tunnel front chamber 10, 11, 15, 16 wind power generator 12 drainage and dust removal section 13, 14 wind tunnel front chamber opening 17 heat exchanger 18 heater

Claims

1. A wind power generation device comprising: a sand-based material containing sand; a wind tunnel having an upper opening and a lower opening; a sand container arranged around the side wall of the wind tunnel and storing the sand-based material; heating means arranged within the sand-based material and configured to heat the sand-based material from outside the wind power generation device; a wind tunnel front chamber having an air inlet and connected to the wind tunnel; a wind mill installed within the wind tunnel and / or the wind tunnel front chamber; and a wind power generator installed in the wind tunnel front chamber and driven by the wind mill; the heating means within the sand-based material includes a heater, a heat conductor, or a heat exchanger, a steam pipe, or dry steam from electricity generated outside, including surplus electricity; heat is stored in the sand-based material as thermal energy obtained by heating with the heating means; and the wind power generator installed in the wind tunnel front chamber can be installed or maintained. When electricity is needed outside the wind power generation device, the windmill is driven by an updraft of air related to the temperature difference between the inside and outside of the air in the wind tunnel, which is caused by the thermal energy stored in the sand base material causing the temperature of the air in the wind tunnel to rise, the elevation difference of the position of the opening of the wind tunnel, and the effective area of ​​the opening of the wind tunnel, and the wind generator driven in conjunction with the windmill, generating electricity.

2. The sand-based thermal storage wind power generation device described in claim 1 is characterized in that the sand-based material is stored as thermal energy obtained by at least one of heating methods including heating by a heater using electricity generated by the wind power generator, heating by a heater using external electricity such as surplus electricity, heating by a thermal conductor, heating by a heat exchanger, thermal heating by a steam pipe, or dry steam heating, and is configured to be able to output the thermal energy stored in the sand-based material to the outside by the heat exchanger or thermal conductor when external electricity is required.

3. The sand thermal storage type wind power generation device according to claim 1, characterized in that the wind turbine is a horizontal axis wind turbine or a vertical axis wind turbine, and has at least one of a limit load fan, a turbine type wind turbine, a Bernoulli theorem type wind turbine, a propeller type wind turbine, a cell wing type wind turbine, a multi-blade type wind turbine, a Magnus type wind turbine, a Darrieus type wind turbine, a Savonius type wind turbine, a Gyaromill wind turbine, a cross-flow wind turbine, a Sirocco fan, a turbo fan, a line fan, or an S-type wind turbine.

4. The sand thermal storage wind power generation device according to claim 1, characterized in that:

4. The wind tunnel front chamber opening of the wind tunnel front chamber has a lid portion, which is arranged to cover a portion of the wind tunnel front chamber and be able to be opened and closed; the wind tunnel front chamber opening can be kept closed by the lid portion except when the wind turbine or the wind power generator is being installed or maintained and inspected; the wind tunnel front chamber has an air inlet, a wind inlet chamber and an air inlet lid on its upper side, the height of the air inlet is set so as to prevent the inflow of water and dust from the outside, and the air inlet lid of the air inlet can be opened and closed to adjust the amount of air inflow and is set so as to allow air to flow in from the outside as necessary; the wind tunnel front chamber has an air inlet on its side and a drainage and dust removal section on its lower side, the air inlet on the side is set so as to allow air to flow in from the outside as necessary, and the drainage and dust removal section is configured to allow drainage and dust removal.

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