What scientific and technological methods can eliminate smog weather?

There are two main ways to eliminate smog in nature, one is by wind and the other is by rain. Some environmental protection departments and scientists follow this idea to eliminate smog.

Building urban air ducts to blow smog.

Pollution particles in the urban atmosphere could have spread with the wind, but the higher the building, the more firmly the pollution is locked in the sky. Hazy days appear, and the wind is everywhere. The environmental protection and planning departments of Shanghai, Hangzhou and other cities are jointly studying the "urban air duct" to draw wind from the most ventilated places in each city to blow away the smog.

In fact, the so-called urban air duct is also called urban ventilation corridor, and many cities at home and abroad have already had successful precedents. Six ecological corridors have been built in Wuhan, forming six "air ducts", with the narrowest two or three kilometers and the widest ten kilometers, which can reduce the average maximum temperature in Wuhan in summer by 1℃ to 2℃.

There is also Munich, Germany, where dry and hot winds burn every year, so people plan to build five urban ventilation corridors.

Electrostatic catalytic artificial rainfall

As early as 20 1 1, Yuan Pan, an academician of China Academy of Engineering and a professor at Huazhong University of Science and Technology, was studying the technology of "electrostatic catalytic artificial rainfall": a new technology that uses electrostatic field to promote the condensation of water vapor, which can also realize artificial rainfall in sunny days and low relative humidity, thus effectively eliminating smog. The advantage of this technology is that charged particles are dispersed in the air and adsorbed in a large area, and its action space is much larger.

The technology invented by Dutch inventor Dagen Rowe szeged also made a fuss about static electricity. According to Luo szeged's idea, some copper coils are buried under lawns in urban parks and other places, and a weak electrostatic field is formed after being electrified. With the help of this electrostatic field, some floating smog particles will be attracted to the ground, thus forming a "fresh air" area in the air. At the same time, particles falling to the ground are easy to collect and clean. He believes that it is "very safe" to bury the copper coil underground and plant a lawn on it, because the electrostatic field is quite weak.

Uav haze removal

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This year, AVIC Aerospace Company, a subsidiary of AVIC Group, developed a flexible wing UAV that can eliminate smog, and the aircraft was successfully tested at Xiangbei Experimental Base.

Flexible wing UAV has two functions of eliminating cold fog and warm fog. This product installs hygroscopic plasmids such as salt and urea in the cabin of flexible wing UAV, flies to the designated fog area, and spreads hygroscopic plasmids such as salt and urea as catalysts to produce a large number of condensation nuclei. Water vapor condenses on the condensation nuclei and grows into large water droplets, which will evaporate and condense on the large water droplets to make the warm fog disappear. At the same time, catalysts such as dry ice and liquefied propane can diffuse into the fog and produce a large number of ice crystals. Through the transformation process of Bejilong ice water, they catch the moisture of the original fog drops, the fog evaporates, the ice crystals grow and fall to the ground, making the cold fog disappear.