Scientists will use solar energy to develop desert electricity in the desert

After hydropower, thermal power, wind power, nuclear power, etc., the scientists continued their efforts to develop another new power generation method: “Sand Power.”

According to reports, experts from the University of Tokyo and Chubu University in Japan have experimentally built a “sand power station” in the Sahara Desert in Africa. The large-scale battery panel with an area of ​​100 square meters and a power generation capacity of 10 kilowatts is expected to be utilized in the desert. Inexhaustible sand and plenty of warm sunshine provide green energy in a new way.

As we all know, the main component of sand is silica, and Japanese experts envisage mimicking the way of making iron and mixing sand and carbon at a high temperature of more than 1,500 degrees Celsius for chemical reactions. When oxygen and carbon are combined into carbon dioxide, the oxygen in the silica is also removed, and the extracted silicon is then made into a solar panel placed in the Sahara desert. It is worth mentioning that the experts have reduced the high purity requirements for the extracted silicon. (In the past, the silicon used in the manufacture of solar cells was the ultra-high-purity silicon used in the manufacture of semiconductors, and the purity was as high as 99.999999999%.) The conversion rate of solar energy to electrical energy during work is also reduced to only about 2%. However, the desert desert is uninhabitable and some of it is space. Unlike the narrow roof space of a city, the battery panel must have a small area and a high conversion rate. Therefore, only the area of ​​the panel is intended. Magnification can make up for it, and technical difficulties are greatly reduced.

What is even more crucial is how long-distance power is delivered from solar power plants. The Japanese currently plan to use superconducting technology (that is, to achieve zero resistance when the conductor temperature drops to around -200 degrees Celsius). The specific approach is to inject -200 degrees Celsius of liquefied nitrogen into the inner tube of the double pipeline, and the transmission line is laid there. In order to achieve better insulation, the sandwich between the two pipelines is kept in vacuum and the entire pipeline is buried deep in the desert. In addition, a cooling station is installed every 20 km or so to ensure that liquefied nitrogen is re-cooled in the freezer to the required low temperature. All the cooling equipment needed can also be supplied by solar cells.

At present, researchers at the University of Central Japan in the Sahara have made some progress. According to the person in charge, Prof. Yamaguchi disclosed that the first time a superconducting cable for DC transmission was successful last year, with a transmission distance of 200 meters, it is expected to achieve a long-distance transmission of 2-20 kilometers within five years.

Algeria and other North African countries around the Sahara Desert are very interested in "Sand Power". Recently, the Oland University of Technology in Algeria has signed relevant cooperation agreement on technology development with Japan. Tunisia has also set up a special technology for the development of sand electricity. Institutions, research topics include basic theory to business plans. Japanese experts also stated that the development of “sand electricity” is not limited to the Sahara and other large deserts. In fact, small and medium-sized deserts around the towns on the Earth abound, and it is expected that the total area of ​​desert solar panels laid in various parts of the world will be expected within a year. More than 800 square kilometers, the world will soon usher in a new era of green energy.

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