Solar thermal power generation, usually called concentrating solar power generation, obtains thermal energy by concentrating solar radiation, converts thermal energy into high-temperature steam, and steam drives turbines to generate electricity. Solar energy can be mainly divided into trough-type power generation, tower-type power generation, and disc-type power generation. According to rough statistics, by the end of 2017, among the solar thermal power stations built and under construction in the world, the number of trough power stations is the largest, accounting for about 80% of the total number of solar thermal power stations built and under construction, and tower power stations accounting for over 11% of the total. The minimum number of disc-type stations is less than 9%.
The above three types of solar energy collection methods: trough, tower and dish, are all reflective. They reflect sunlight to the collector. Since these three types of collectors must be installed over the mirror , This technical requirements are very high, and the cost of construction is also high.
Song Liang, a solar energy expert, invented the transmission-type high-power concentrating heat collection method, which is based on the Fresnel lens principle, and successfully produced the world's largest high-power condenser lens (below). It has the following advantages: Made into a large lens with a diameter of several meters, 2. Convergent magnification of more than 1000 times, this lens can be directly heated to 800 degrees Celsius or more. 3. Focus plane is a uniform plane spot. The Fresnel lens spot is the center point The strongest, the weaker the light from outside to outside.
If the production technology allows it, the lens can actually be 500 meters in diameter, 3,000 times in focus, and the spot size is about 65 square meters. The spot temperature can reach thousands of degrees Celsius instantaneously. This device can be used for molten iron and steelmaking. , Solar steelmaking, environmental protection and energy saving.
The greatest advantage of the transmissive high-power condenser heat collection method over the traditional reflective heat collection method is its low cost, because its collector is below the lens. The high power condenser lens is very suitable for large-scale photo-thermal power generation. The total cost of a solar thermal power station built using this technology is about 40% lower than the total cost of a tower-type solar thermal power station. The cost of solar thermal power generation is basically close to that of photovoltaic power generation. Large-scale application of solar thermal power generation can be realized. Now.
Advantages of photothermal power generation compared to photovoltaic power generation: As the heat energy of high-temperature liquids is easy to store, the heat storage system of the solar thermal power station can store excess heat during the day and generate electricity at night, thus realizing continuous 24-hour power supply to the solar thermal power station and ensuring the output current of the power station. Stability will not impact the grid.
If most California deserts are built with transmissive high-powered concentrating solar thermal power stations, the electricity generated will be sufficient to supply electricity throughout the United States, and as low as 8 cents per kilowatt-hour, this is a very promising undertaking. The United States also has hundreds of billions of dollars in the market.
In addition, a single high-power condenser lens can be easily used in outdoor cooking, especially where there is no electricity and no fuel, as long as the large lens can be set up to cook, warming and warming, etc. to solve the wild prospecting , field exploration, life training problems in the field.
