Solar heat storage and utilization method and device

Abstract

The invention relates to a solar heat storage and utilization method and device, and the device utilizes N condensing lenses on the same plane to focus sunlight to a stainless steel rectangular flat inner container on the same plane to generate huge heat. The space between the lens and the inner container is sealed and vacuumized, and the inner container is welded to a stainless steel inner panel of a focusing surface through cooling fins, so that heat of sunlight focused on the inner container is not dissipated outwards and is conducted to the cooling fins in the inner container, and heat storage heavy diesel oil flowing in the stainless steel inner container is heated; and closed-loop circulation is formed in the heat storage tanks with different temperatures and different potential positions. The solar water heater can release heat of the heat storage oil at any time according to needs to heat other needed equipment facilities, can be widely applied to places needing heat such as enterprises and families, greatly improves the utilization rate of solar energy, and can be used at any time day and night.

Description

Technical Field

[0001] Based on the optical principle that a focused point will generate huge amounts of heat, a focusing lens is used to focus natural sunlight to generate heat, which is then heated and stored in thermal oil. The stored heat can then be released at any time as needed to heat other equipment and facilities that require heat. This is a new method of utilizing solar thermal energy. Background Art

[0002] As we all know, solar photovoltaic power generation uses sunlight striking silicon wafers to generate electrons, generating direct current (DC) electricity. However, the global solar energy conversion rate for this method currently exceeds 26%, and it only generates DC electricity when the sun is shining; it cannot generate electricity at night or on cloudy days. This is incompatible with my country's AC power grid, which is used for both industrial and residential applications. Energy storage and conditioning are required, as well as conversion to AC power for use, resulting in high losses and low efficiency. Amidst global warming, countries are increasingly prioritizing the innovation and development of new energy sources to mitigate the impact of rising CO2 emissions on rising temperatures. However, few methods for utilizing solar thermal energy are available. Therefore, improving the conversion rate of solar energy and utilizing it even when the sun is off are crucial, as they are essential for my country's green energy transition and sustainable development. Based on optical principles, our system utilizes N concentrating lenses, automatically aligned with the sun by a heliostat, focusing sunlight onto a flat, rectangular stainless steel inner tank, generating heat. This heat is then transferred to the heat sink within the tank, heating the flowing thermal oil. This significantly reduces the area exposed to sunlight and improves the utilization of solar energy. By properly matching the flow rate of the thermal oil in the liner with the number of concentrating lenses, the flowing thermal oil is heated to above 300°C and then stored in a vacuumed thermal tank for later use. The thermal oil can be heavy diesel with a boiling point above 300°C (the boiling point of heavy diesel is approximately 350°C-410°C). Heating it absorbs the heat below the boiling point and stores it in the oil. The pipes, liner, and thermal tank through which the oil flows are insulated with insulation materials to prevent heat from dissipating. The thermal oil can be reused. The amount of thermal oil and the number of concentrating lenses are selected based on the required heat, while also considering the size of the site required for the equipment. The thermal tank can be placed in an unused area such as a roof, and the concentrating lenses in an area with good lighting. The thermal oil can be recycled. This device can be widely used in places where heat is needed, such as enterprises and homes, greatly improving the utilization rate of solar energy and can be used at any time day and night. For example, the heat of the thermal storage oil can be released to a generator set that converts expansion heat energy into kinetic energy to generate electricity, released to drying equipment to dry items, released to heating equipment to heat, released to a water heater to use hot water, and so on. Summary of the Invention

[0003] Based on optical principles, N concentrating lenses are aligned in the same plane, automatically aligned with the sun by a heliostat. This focuses sunlight onto a flat, flat stainless steel inner tank, generating significant heat. Because the area between the focusing surface and the lens is a sealed, evacuated light-collecting zone, the focused heat is transferred solely to the heat sink within the tank, thereby heating the thermal oil flowing through it. When the thermal oil flow rate matches the number of concentrating lenses, the lower-temperature oil, flowing from the higher-potential tank B through the heated stainless steel inner tank by the N concentrating lenses, reaches a temperature exceeding 300°C and flows to the higher-temperature, lower-potential tank D. It is then pumped into the higher-temperature, higher-potential tank A, where the thermal oil is readily available to heat equipment requiring heat. The oil then flows to the lower-temperature, lower-potential tank C, where it is then pumped back into the lower-temperature, higher-potential tank B, forming a closed-loop flow. Boxes B and A are connected at the bottom by a pipe with a one-way valve installed in between. If the thermal oil in box A runs out during continuous rainy days, the one-way valve is opened and the used thermal oil is reused. While the used thermal oil has only cooled slightly, it still maintains a temperature of 200°C and can be reused. The advantages of this device are: 1) high heat generation while requiring minimal illumination; 2) high solar thermal energy conversion efficiency; 3) heat can be used at any time of day or night, storing heat for several days; and 4) wide application range. Therefore, this technology represents a novel approach to solar thermal energy storage and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] (1) Figure 1 It is a plan view of the connection process of technical equipment. (2) Figure 2 It is a schematic diagram between the focusing lens and the stainless steel inner tank. (3) Figure 3 It is a schematic diagram of the plane inside the stainless steel liner. (4) Figure 4 It is a schematic diagram of the cross section of the stainless steel liner. DETAILED DESCRIPTION

[0005] Construct four heat-resistant, sealed iron boxes of equal volume: A, B, C, and D. Their sizes are determined based on the required heat generation, the number of concentrating lenses, and the number of stainless steel inner chambers, taking into account the equipment's footprint. They are connected by pipes. The boxes, pipes, and inner chambers are wrapped in insulation. The concentrating area between the inner chamber's focusing surface and the lens surface is evacuated. The inner chambers are connected by heat-resistant hoses (similar to the hoses used to connect steam irons, but with a slightly larger diameter). This allows the connections between the inner chambers to rotate with the sun's rays without affecting the flow of heat through the pipes. Boxes A and B should be installed at a height that is at least one box height higher than that of boxes C and D, and higher than the installation height of the stainless steel inner chambers. Check valves should be installed between box A and the equipment requiring heat, between box B and A, and between box B and the stainless steel inner chambers to control flow. High-temperature pumps should be installed between box C and B, and between box D and A. Tank B should be filled to 80% with thermal oil. After being heated by the concentrating light in the inner chambers, it flows to tank D, which is then pumped into tank A. After the heat storage oil in box B has flowed out, it will be injected with 80% full heat storage oil. The two boxes of oil will be used in rotation. Before use, the box body, inner tank and pipeline will be evacuated with a vacuum pump, so that the solar thermal energy can be used at any time day and night.

Claims

1. A concentrating lens is used to focus sunlight to generate heat to heat the thermal oil flowing in the stainless steel inner tank, and store it in a thermal storage tank. The heat of the thermal oil can then be released at any time as needed to heat other required equipment and facilities.

Images