Solar solid-state gravel heat storage power generation

Abstract

In order to solve the conflict between the height and the concentration ratio of a heat collection apparatus, a one-dimensional rotation triple reflection solar concentrator is used as a light concentration unit in the present invention; in order to avoid the influence of stress generated by thermal expansion and cold contraction of heat storage gravel on a heat storage container, sufficient distances are reserved between an inner edge of the heat storage container and the edges of the top and the bottom of a heat storage gravel pile in the present invention; and in order to solve the problem that each piece of gravel can be simultaneously and equivalently heated or cooled as remaining gravel on the same horizontal plane in the gravel pile, the heat storage gravel pile of the present invention is a prismatic gravel pile having the same gravel particle size, some of gas heat exchange pipelines are uniformly arranged on an upper bottom surface and a side surface of the prismatic gravel pile, and the remaining gas heat exchange pipelines are uniformly arranged in a middle area of a lower bottom surface of the prismatic gravel pile; some of all the pipelines uniformly blow gas, and the remaining pipelines uniformly suction gas; from the gas blowing pipelines to the gas suction pipelines, the resistance of the gas flowing through the gravel pile in any direction is identical, the flow rate of the heat exchange gas at any point in the gravel pile is equal, and any gravel in the gravel pile and the remaining gravel on the same horizontal plane in the gravel pile are simultaneously and equivalently heated or cooled.

Description

Solar solid-state gravel thermal storage power generation Technical Field

[0001] The invention belongs to the technical field of solar solid-state gravel heat storage and power generation. Background Art

[0002] Traditional fossil energy is in short supply and highly polluting. Solar photovoltaic and wind power generation are unstable among new energy sources, and solar thermal energy storage and power generation are expensive and difficult to promote. Technical issues

[0003] The existing solar thermal conversion and solid gravel heat storage have their own problems: 1. The heat collection equipment is too high and the concentration ratio is too low; 2. Due to the stress caused by the thermal expansion and contraction of the gravel, the heat storage container containing the gravel and the appropriate heat exchange method have not yet been invented. Technical Solutions

[0004] The concentrating element uses a one-dimensional rotating three-reflection solar concentrator. The concentrator's rotation axis is parallel to the local latitude, and the mirror field is rectangular, with the long side parallel to the local latitude. The long side of the rectangular mirror field should be as long as possible. The plane mirror of the concentrator, located at a vertical distance from the collector, rotates back and forth at a slight positive or negative angle, centered on the angle of alignment with the collector. The parabolic mirror is constructed using a double layer of glass, one thin and one thick, sandwiched between a layer of metallic silver film. An alloy with a thermal expansion coefficient equal to that of silver is made from inexpensive or abundant metals in appropriate proportions, and then electroplated with a mirror-like silver film. The mirror surface is protected by a thin, tough, non-contact, transparent film. The film is wound around two rotating shafts with side scrapers, which rewind in and out to remove dust and sand adhering to the film. The parabolic shape is made of non-deformable wood or bamboo, and is connected to the metal or glass parabolic mirror with flexible point or line connections, providing support and reducing the use of metal or glass. In cloudy weather, use a drone carrying powdered kaolin or dry ice to economically clear clouds.

[0005] In the heat collection link, the heat collection pipeline is covered with a glass tube, and the annular space between the heat collection pipeline and the glass tube is vacuum. High-temperature and high-pressure heat exchange gas passes through the heat collection pipeline. The central axis of the heat collection pipeline is set at the focal line of the compound parabolic concentrator CPC. The opening of the compound parabolic concentrator CPC faces the mirror field. The CPC is composed of multiple pieces, and the edges of two adjacent pieces overlap in the air to increase wind resistance. Methods for increasing the heat transfer gas temperature within the collector pipeline: 1. Arrange several small-diameter collector tubes closely in a "1" shape and outer glass tubes. A vacuum is created between the glass tubes and the several small tubes, and high-temperature, high-pressure heat transfer gas flows through the small-diameter collector tubes. 2. A large glass tube is nested within a small glass tube, which is then nested within a long arc-shaped collector plate, with the opening of the arc-shaped collector plate facing the mirror field. A vacuum is created between the large and small glass tubes, and high-temperature, high-pressure heat transfer gas flows through the small glass tubes. 3. Nest a large tube within a glass tube, which is then nested within several small tubes. A vacuum is created between the glass tubes and the large tubes, and the space between the large tubes and the several small tubes is filled with liquid aluminum or lead. The liquid aluminum or lead acts as a heat transfer medium, flowing radially and circumferentially but not axially. High-temperature, high-pressure heat transfer gas flows through the small tubes. Methods for improving the economic efficiency of the collector pipeline: Segment the collector pipeline, using inexpensive materials at the low-temperature inlet and expensive materials at the high-temperature outlet.

[0006] In the heat exchange process, the heat exchange gas is selected to be a gas with high density, high specific heat capacity, thermal stability, no corrosion to equipment and heat storage gravel, and low viscosity. The heat exchange gas with a temperature below 300 degrees Celsius is blown from the outlet of the heat storage container to the inlet of the high-temperature heat collection pipeline. It obtains heat and heats up during the flow in the high-temperature heat collection pipeline. The heated heat exchange gas is blown from the outlet of the high-temperature heat collection pipeline to the inlet of the heat storage container. After entering the high-temperature main pipeline in the heat storage container, it is evenly distributed to each perforated pipeline by the high-temperature main pipeline. Each perforated pipeline blows the high-temperature heat exchange gas evenly to the upper bottom surface and side surfaces of the gravel pile. The high-temperature heat exchange gas flows through the gravel pile to transfer heat to the gravel and cool it down. The cooled heat exchange gas is placed in the gravel. The slit pipelines on the bottom surface of the stone pile are evenly sucked in and merged into the low-temperature main pipeline, which is blown from the low-temperature main pipeline to the outlet of the heat storage container and then to the inlet of the high-temperature heat collection pipeline, completing the heat exchange cycle between the heat exchange gas, the high-temperature heat collection pipeline and the heat storage gravel. When the temperature of the gravel rises to 300 degrees Celsius, the high-temperature heat exchange gas transfers heat to the gravel, and the temperature will not drop to 300 degrees Celsius. The heat exchange gas still above 300 degrees Celsius is blown to the power generation boiler to cool down to below 300 degrees Celsius, and is sucked in by the low-temperature sub-pipeline and blown to the inlet of the high-temperature heat collection pipeline.

[0007] In the heat storage link, heat transfer includes heat conduction, heat convection, and heat radiation. The heat storage container of the present invention includes the following parts: a foundation, vertical walls and a roof of a building on the foundation, a vacuum insulation layer and a heat radiation reflection layer hanging on the inner wall of the vertical wall of the building and under the roof of the building, and a high-temperature and high-pressure resistant insulation material layer covering the foundation. The heat storage medium of the present invention is solid gravel. The gravel is piled in the heat storage container at an angle less than or equal to the minimum repose angle of the gravel pile under high and low temperature conditions, that is, a heat storage gravel pile. The gravel particle size is equal, so that the porosity of each point in the gravel pile and the gas permeability of each point in the gravel pile in all directions are equal. A sufficient distance is maintained between the vertical walls of the heat storage container and the sides of the lower bottom surface of the gravel pile. A sufficient distance is maintained between the roof of the heat storage container and the upper bottom surface of the gravel pile. When the gravel pile expands in volume due to heat, the gravel pile does not exert force on the vertical walls and roof of the heat storage container. The geometric shape of the gravel pile is a truncated cone or a prism. The gravel pile selected by the present invention The geometric shape is a prism whose upper and lower bases are both rectangular and whose geometric center points are on the same plumb line. The short side of the rectangular upper base of the prism selected by the present invention is several times or dozens of times the height of the prism. A truncated cone gravel pile is selected, and the angle between the generatrix of the truncated cone and the lower base is slightly less than or equal to the minimum repose angle of the gravel pile under high and low temperature conditions. A prism gravel pile is selected, and the angle between each side surface of the prism and the lower base is slightly less than or equal to the minimum repose angle of the gravel pile under high and low temperature conditions. When the gravel pile expands due to heat or contracts due to cooling, the gravel will not slide or collapse, thereby maintaining the stability of the geometric shape of the gravel pile. Multiple perforated pipelines are evenly distributed on the upper bottom surface and side surfaces of the gravel pile. High-temperature heat exchange gas is evenly blown toward the upper bottom surface and side surfaces of the gravel pile through the perforated pipelines and is evenly sucked into the multiple slotted pipelines placed on the lower bottom surface of the gravel pile. The distance between the slot position of any slotted pipeline and each side of the lower bottom surface of the gravel pile is greater than or equal to the height of the gravel pile. The heat exchange gas experiences the same resistance in any direction flowing from the perforated pipelines to the slotted pipelines through the gravel pile, so that the flow rate of the heat exchange gas flowing from any point in the gravel pile to the slotted pipelines is equal. As a result, any gravel on any horizontal plane in the gravel pile can be heated at the same amount as the other gravel on the same horizontal plane. Every gravel on any horizontal plane in the gravel pile expands at the same amount due to heat, thereby maintaining the stability of the geometric shape of the gravel pile. High-temperature heat exchange gas blown from perforated pipelines or high-temperature resistance wires transfers heat to the gravel pile, which stores the heat and increases its temperature. The heat storage rate gradually decreases from high to medium temperature from the upper to lower surface of the gravel pile. Perforated pipelines are perforated horizontally and symmetrically on both sides to ensure uniform force during air intake and air output. Slotted pipelines are slotted semi-circumferentially to ensure mechanical strength. Adjacent slotted pipelines alternately draw air at regular intervals to prevent excessive temperatures from decreasing mechanical strength and ensure more uniform heat transfer within the gravel.The heat exchange gas flow rates of the perforated and slotted pipelines remain equal at all times, meaning the heat exchange gas flow rates at the inlet and outlet of the heat storage vessel are the same. This maintains the gas pressure inside the vessel at atmospheric pressure, ensuring the structural stability of the building's vertical walls and roof. The roof is designed to be flexible, and a large number of heat-resistant and pressure-resistant support columns of a certain height and elasticity are installed on the top of the rubble pile to support the flexible roof. The particle size of the rubble can gradually increase from the top to the bottom of the rubble pile, and the particle size of rubble on the same horizontal surface within the rubble pile is uniform. Solid rubble is sourced locally and includes dark-colored rubble, low-density rubble, high-melting-point rubble, high-specific heat capacity rubble, high-thermal stability rubble, high-thermal conductivity rubble, and high-mechanical strength rubble. The heat storage vessel and the rubble pile are free of dust, impurities, and moisture. At the bottom of the rubble pile, rectangular perforated pipes are constructed using small, high-temperature and high-pressure resistant stones.

[0008] In the power generation process, the cooled heat exchange gas is evenly blown toward the gravel pile by each slotted pipeline, obtaining heat from the high-temperature heat storage gravel and increasing its temperature. The heated heat exchange gas is evenly sucked into each perforated pipeline and then merged into the high-temperature main pipeline. From the high-temperature main pipeline, it is blown toward the power generation boiler, transferring heat to the power generation boiler and cooling it down. The cooled heat exchange gas is sucked into the low-temperature main pipeline and evenly distributed to each slotted pipeline. From each slotted pipeline, it is evenly blown toward the gravel pile again, completing the heat exchange cycle among the heat exchange gas, power generation boiler, and heat storage gravel in the power generation process. The power generation boiler is placed inside the heat storage container. High-temperature heat exchange gas blown into the boiler from a high-temperature main pipeline continuously transfers heat to the boiler, keeping the water or other fluid inside the boiler in a constant power generation state or in a high-temperature, high-pressure power generation standby state. Each slotted pipeline evenly blows air into the gravel pile. The heat exchange gas experiences the same resistance in any direction flowing through the gravel pile from the slotted pipeline to the perforated pipeline. The flow rate of heat exchange gas flowing into the perforated pipeline from any point within the gravel pile is the same. Any gravel on any horizontal surface within the gravel pile cools down at the same rate as the rest of the gravel on that surface. Every gravel on any horizontal surface within the gravel pile cools and contracts at the same rate, ensuring the geometric stability of the gravel pile. The low-temperature gas blown from the slotted pipeline removes heat from the gravel pile, allowing the pile to release heat and cool down.

[0009] To regulate the power grid's peak load and valley load, wind power generation, photovoltaic power generation, solar thermal power generation, and thermal storage power generation can all or partly or completely form a combined power plant at one or two locations, outputting high-quality electricity to the grid. Within the thermal storage container, the resistance wires built into the perforated pipes are heated to a high temperature by the electricity that the grid cannot absorb. The heat exchange gas flows through the high-temperature resistance wires within the perforated pipes, gaining heat and increasing its temperature. The heated heat exchange gas is evenly blown toward the gravel through the perforated pipes, transferring heat to the gravel and cooling it. The cooled heat exchange gas is evenly drawn through the slotted pipes and merged into the low-temperature main pipeline, from which it flows to the high-temperature main pipeline. The high-temperature main pipeline evenly distributes the low-temperature heat exchange gas to the perforated pipes. The low-temperature heat exchange gas then flows through the high-temperature resistance wires built into the perforated pipes, increasing its temperature, completing the conversion of electrical energy within the thermal storage container into thermal energy from the gravel. When an unstable power source (such as wind power) suddenly experiences a significant increase in power generation, the wind power is first converted into gravel heat. The flow rate of the high-temperature, high-pressure fluid delivered to the generator set by the power boiler of this invention is then gradually reduced, while the wind power delivered to the power grid is gradually increased. When an unstable power source (such as wind power) suddenly experiences a significant decrease in power generation, the flow rate of the high-temperature, high-pressure fluid in the power boiler of this invention can be instantly increased to the generator set, replenishing power to the grid. Combined power plants maintain a 30-day supply of coal to prepare for the possibility of extended periods of extreme rain. In suitable areas, electrochemical plants can be constructed near combined power plants to utilize excess electricity to produce starch, ethanol, and other products. Beneficial effects

[0010] The height of the solar collector is reduced by 80%, and the concentration ratio is doubled; the volume of the gravel container can be large or small, the thermal insulation capacity is better, and the heat exchange efficiency of the gravel is higher; peak shaving and valley filling can be used to regulate the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The cross-sectional view AA is a cross-sectional view of the heat storage container, various pipelines and the heat storage gravel pile, the longitudinal section view BB is a longitudinal section view of the heat storage container, various pipelines and the power generation boiler, and the longitudinal section view CC is a longitudinal section view of the heat storage container, various pipelines and the heat storage gravel pile. The numbers in the figures are: (1) the section line position and section viewing direction of the longitudinal section view BB, (2) the section line position and section viewing direction of the longitudinal section view CC, (3) the building roof of the heat storage container, (4) the vacuum insulation layer and the heat radiation reflection layer hanging on the inner wall of the building vertical wall and under the building roof, (5) the high-temperature main pipeline, (6) the valve of the connecting pipeline of the high-temperature main pipeline and the perforated pipeline, (7) the connecting pipeline of the high-temperature main pipeline and the perforated pipeline, (8) the perforated pipeline, (9) Circular holes punched on the perforated pipeline, (10) vertical wall of the building of the heat storage container, (11) low-temperature main pipeline, (12) valve of the connecting pipeline between the low-temperature main pipeline and the slotted pipeline, (13) high-temperature heat storage gravel located at the top of the gravel pile, (14) medium-high temperature heat storage gravel located in the middle of the gravel pile, (15) medium-temperature heat storage gravel located at the bottom of the gravel pile, (16) connecting pipeline between the low-temperature main pipeline and the slotted pipeline, (17) slotted pipeline, (18) circumferential slots on the slotted pipeline, (19) high-temperature and high-pressure resistant insulation material layer covering the foundation, (20) foundation, (21) high-temperature and high-pressure fluid outlet of the power generation boiler, (22) power generation boiler, (23) high-temperature and high-pressure fluid outlet valve of the power generation boiler, (24) high-temperature main pipeline facing the power generation Boiler opening, (25) Section line position and section viewing direction of cross-section AA, (26) Building roof of heat storage container, (27) Vacuum insulation layer and heat radiation reflector layer attached to the inner wall of building vertical wall and under the building roof, (28) Inlet of heat storage container, (29) Low-temperature and low-pressure fluid inlet valve of power generation boiler, (30) Low-temperature and low-pressure fluid inlet of power generation boiler, (31) Vacuum insulation layer and heat radiation reflector layer attached to the inner wall of building vertical wall, (32) Valve of high-temperature main pipeline opening facing power generation boiler, (33) High-temperature main pipeline, (34) Low-temperature main pipeline, (35) Perforated pipeline, (36) Connecting pipeline between high-temperature main pipeline and perforated pipeline, (37) Valve of connecting pipeline between high-temperature main pipeline and perforated pipeline , (38) valve at the inlet of the heat storage container, (39) vertical wall of the heat storage container, (40) opening of the low-temperature main pipeline facing the power generation boiler, (41) valve of the opening of the low-temperature main pipeline facing the power generation boiler, (42) valve of the connecting pipeline between the low-temperature main pipeline and the slit pipeline, (43) connecting pipeline between the low-temperature main pipeline and the slit pipeline, (44) slit pipeline, (45) high-temperature and high-pressure resistant insulation material layer covering the foundation, (46) valve at the outlet of the heat storage container, (47) outlet of the low-temperature branch pipeline, (48) low-temperature branch pipeline, (49) valve of the low-temperature branch pipeline, (50) vacuum insulation layer and heat radiation reflection layer, (51) inlet of the low-temperature branch pipeline, (52) foundation, (53) vertical wall of the heat storage container,(54) The outlet of the heat storage container, (55) The roof of the heat storage container, (56) The vacuum insulation layer and the heat radiation reflective layer attached to the inner wall of the building and under the roof of the building, (57) The vertical wall of the heat storage container, (58) The vacuum insulation layer and the heat radiation reflective layer attached to the inner wall of the building vertical wall, (59) The perforated pipeline, (60) The vacuum insulation layer and the heat radiation reflective layer, (61) The high-temperature heat storage gravel located at the top of the gravel pile, (62) The medium-high temperature heat storage gravel located in the middle of the gravel pile, (63) The medium-temperature heat storage gravel located at the bottom of the gravel pile, (64) The foundation, (65) The high-temperature and high-pressure resistant insulation material layer covering the foundation, (66) The slit pipeline, (67) The section line position and section viewing direction of the cross-sectional view AA, (68) The vertical wall of the heat storage container. Industrial Applicability

[0012] Most of the equipment of the present invention has been industrialized and mass-produced, the industrial chain of the present invention is very short, and it is easy to promote and apply on a large scale.

Claims

1. A one-dimensional rotating three-reflection solar concentrator is used as the concentrating unit. The rotation axis of the concentrator is parallel to the local latitude. The mirror field is rectangular. The long side of the rectangular mirror field is parallel to the local latitude. The long side of the rectangular mirror field should be as long as possible. The plane mirror of the part of the concentrator that is far from the collector vertically rotates back and forth at a small positive or negative angle with the angle aligned with the collector as the center.

2. Use a thin and thick double layer of glass with a layer of metallic silver film to make a parabolic mirror. Use cheap or abundant metals in a suitable proportion to make an alloy with the same thermal expansion and contraction coefficient as metallic silver, and electroplate a mirror silver film to make a parabolic mirror. The mirror surface is protected by a non-contact thin and tough light-transmitting film. The film is wound on two rotating shafts with side scrapers and rolled in and out to clean the dust and sand attached to the film. Use wood or bamboo materials that are not easy to deform to make a parabolic shape and a metal or glass parabolic mirror with movable point connections or line connections to provide force support for the metal or glass parabolic mirror to reduce the use of metal or glass.

3. Methods to increase the temperature of heat exchange gas in the heat collection pipeline:

1. Several small-diameter heat collection tubes are closely arranged in a "1" shape and covered with glass tubes. There is a vacuum between the glass tubes and the several small tubes, and high-temperature and high-pressure heat exchange gas passes through the small-diameter heat collection tubes; 2. A small glass tube is covered inside a large glass tube, and then a heat collection arc long sheet is covered inside the large glass tube. The opening of the heat collection arc long sheet faces the mirror field. There is a vacuum between the large and small glass tubes, and high-temperature and high-pressure heat exchange gas passes through the small glass tube; 3. A large pipeline is covered inside a glass tube, and then several small pipelines are covered inside the glass tube. There is a vacuum between the glass tube and the large pipeline, and the space between the large pipeline and the several small tubes is filled with liquid aluminum or lead. The liquid aluminum or lead acts as a heat transfer medium and flows radially and circumferentially but not axially, and high-temperature and high-pressure heat exchange gas passes through the small pipeline.

4. The heat exchange gas with a temperature below 300 degrees Celsius is blown from the outlet of the heat storage container to the inlet of the high-temperature heat collection pipeline. It gains heat and heats up during the flow in the high-temperature heat collection pipeline. The heated heat exchange gas is blown from the outlet of the high-temperature heat collection pipeline to the inlet of the heat storage container. After entering the high-temperature main pipeline in the heat storage container, it is evenly distributed to each perforated pipeline by the high-temperature main pipeline. Each perforated pipeline blows the high-temperature heat exchange gas evenly to the upper bottom surface and side of the gravel pile. The high-temperature heat exchange gas flows through the gravel pile to transfer heat to the gravel and cool down. The cooled heat exchange gas is placed The slit pipelines on the bottom of the gravel pile are evenly sucked in and merged into the low-temperature main pipeline, which is blown from the low-temperature main pipeline to the outlet of the heat storage container and then to the inlet of the high-temperature collector pipeline, completing the heat exchange cycle of the heat exchange gas, the high-temperature collector pipeline and the heat storage gravel in the heat exchange link. When the temperature of the gravel rises to 300 degrees Celsius, the high-temperature heat exchange gas will transfer the heat to the gravel, and the temperature will not drop to 300 degrees Celsius. The heat exchange gas still above 300 degrees Celsius is blown to the power generation boiler to cool down to below 300 degrees Celsius, and is sucked in by the low-temperature sub-pipeline and blown to the inlet of the high-temperature collector pipeline.

5. The heat storage container of the present invention comprises the following parts: a foundation, vertical walls and a roof on the foundation, a vacuum insulation layer and a heat radiation reflection layer hung on the inner walls of the vertical walls and under the roof, and a high temperature and high pressure resistant insulation material layer covering the foundation.

6. The heat storage medium of the present invention is solid gravel. The gravel is piled in the heat storage container at an angle less than or equal to the minimum repose angle of the gravel pile under high and low temperature conditions, i.e., a heat storage gravel pile. The gravel particle size is equal, so that the porosity of each point in the gravel pile and the gas permeability of each point in the gravel pile in all directions are equal. A sufficient distance is kept between the vertical wall of the heat storage container and each side of the lower bottom surface of the gravel pile, and a sufficient distance is kept between the building roof of the heat storage container and the upper bottom surface of the gravel pile. When the gravel pile expands in volume due to heat, the gravel pile does not generate a force on the building vertical wall and building roof of the heat storage container. The geometric shape of the gravel pile is a truncated cone or a prism. The gravel selected in the present invention The geometric shape of the pile is a prism whose upper and lower bottom surfaces are both rectangular and whose geometric center points are on the same plumb line. The short side of the rectangular upper bottom surface of the prism selected by the present invention is several times or dozens of times the height of the prism. A truncated cone gravel pile is selected, and the angle between the generatrix of the truncated cone and the lower bottom surface is slightly less than or equal to the minimum repose angle of the gravel pile under high and low temperature conditions. A prism gravel pile is selected, and the angle between each side surface of the prism and the lower bottom surface is slightly less than or equal to the minimum repose angle of the gravel pile under high and low temperature conditions. When the gravel pile expands due to heat or contracts due to cooling, the gravel will not slide or collapse, so as to maintain the stability of the geometric shape of the gravel pile.

7. Multiple perforated pipelines are evenly distributed on the upper bottom surface and side surfaces of the gravel pile. The high-temperature heat exchange gas is evenly blown toward the upper bottom surface and side surfaces of the gravel pile through the perforated pipelines and evenly sucked into the multiple slotted pipelines placed on the lower bottom surface of the gravel pile. The distance between the slot position of any slotted pipeline and each side of the lower bottom surface of the gravel pile is greater than or equal to the height of the gravel pile. The heat exchange gas flows from the perforated pipeline to the slotted pipeline through the gravel pile in any direction with the same resistance, so that the flow rate of the heat exchange gas flowing from any point in the gravel pile to the slotted pipeline is equal, so that any gravel on any horizontal plane in the gravel pile can be heated up at the same amount as the rest of the gravel on this horizontal plane, and each gravel on any horizontal plane of the gravel pile is heated and expanded at the same amount at the same time, so as to maintain the stability of the geometric shape of the gravel pile. The high-temperature heat exchange gas blown from the perforated pipeline or high-temperature resistance wire transfers heat to the gravel pile, which stores heat and heats up. The heat storage method of the gravel pile gradually decreases from high-temperature heat storage to medium-temperature heat storage from the upper bottom surface to the lower bottom surface of the gravel pile.

8. The cooled heat exchange gas is evenly blown toward the gravel pile by each slotted pipeline, obtains heat from the high-temperature heat storage gravel and heats up. The heated heat exchange gas is evenly sucked by each perforated pipeline and merged into the high-temperature main pipeline, blown toward the power generation boiler by the high-temperature main pipeline, transfers the heat to the power generation boiler and cools down. The cooled heat exchange gas is sucked by the low-temperature main pipeline and evenly distributed to each slotted pipeline, and then evenly blown toward the gravel pile by each slotted pipeline again, completing the heat exchange cycle of the heat exchange gas, power generation boiler and heat storage gravel in the power generation link.

9. The power generation boiler is placed inside the heat storage container. The high-temperature heat exchange gas blown from the high-temperature main pipeline to the power generation boiler continuously exchanges heat to the power generation boiler, so that the water or other fluid in the power generation boiler always maintains a power generation state or a high-temperature and high-pressure power generation standby state. Each slit pipeline blows air evenly to the gravel pile. The heat exchange gas flows from the slit pipeline to the perforated pipeline through the gravel pile in any direction with the same resistance. The flow rate of the heat exchange gas flowing from any point in the gravel pile to the perforated pipeline is equal. Any gravel on any horizontal plane in the gravel pile and the rest of the gravel on this horizontal plane cool down at the same amount at the same time. Every gravel on any horizontal plane in the gravel pile cools and shrinks at the same amount at the same time, ensuring the stability of the geometric shape of the gravel pile.

10. In the heat storage container, the resistance wire built into the perforated pipeline is heated to a high temperature by the electric energy that cannot be absorbed by the power grid. The heat exchange gas flows through the high-temperature resistance wire in the perforated pipeline to obtain heat and heat up. The heated heat exchange gas is evenly blown toward the gravel by the perforated pipeline, transfers the heat to the gravel and cools it down. The cooled heat exchange gas is evenly sucked into the slit pipeline and merged into the low-temperature main pipeline, flows from the low-temperature main pipeline to the high-temperature main pipeline, and the high-temperature main pipeline evenly distributes the low-temperature heat exchange gas to the perforated pipeline. The low-temperature heat exchange gas flows through the high-temperature resistance wire built into the perforated pipeline again and heats up, completing the conversion of electric energy in the heat storage container to gravel heat energy.

11. When an unstable power source (such as wind power) suddenly increases its power generation, the wind power energy is first converted into gravel heat energy, and then the flow rate of the high-temperature and high-pressure fluid delivered to the generator set by the power generation boiler of the present invention is gradually reduced, and at the same time, the power delivered to the power grid by the wind power is gradually increased. When an unstable power source (such as wind power) suddenly reduces its power generation, the flow rate of the fluid that is always in a high-temperature and high-pressure state in the power generation boiler of the present invention can be instantly increased to the generator set to supplement the power grid with electricity.

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