The first "Haze Removal Tower" in China was built in Xi 'an with a cost of120,000 yuan. Why did it become a joke?

Do you still remember 1952 the smog incident in London, England? 1952 65438+On February 4th, a heavy fog appeared in London, England, which lasted for a whole day, and it didn't dissipate until February 9th.

This time, the visibility of fog is very low, which really explains what "opacity" means. The mixture of fog and soot is black or even yellow. For a time, the dark air caused traffic paralysis in the whole city, and all the normal operating institutions were basically closed.

The bustling city seems to have become a dead city, and the hazy fog gives people a sense of terror and makes people very depressed. The smell of dense fog not only makes people feel difficult to breathe, but also is the root of many respiratory diseases. According to official data, more than 4,000 people died of bronchitis, bronchitis, asthma, pneumonia and other respiratory diseases in these four days.

Since then, the number of people who died of respiratory diseases has more than doubled, and even animals have suffered greatly. This is the frightening "London Smoke Incident".

It was from 20 13 that the new term smog appeared in China. Although the smog in China is not as serious as the smog in London mentioned above, the concentration of PM 2.5 in several cities is higher than the healthy breathing level.

Among them, the top three cities with serious air pollution are Xining, the capital of Qinghai, Xi, the capital of Shaanxi, and Lanzhou, the capital of Gansu. Among them, Xi 'an is the one that impressed us the most. As we all know, the cultural heritage of Xi is second to none, and countless people travel to Xi.

However, the air pollution in Xi ranks among the best in China. Therefore, Xi 'an also worked hard to build the first "Haze Removal Tower" in China, which cost10.2 million yuan, but in the end it became a joke.

The Origin of "Haze Removal Tower"

Facing the increasingly serious smog and the huge losses suffered by other countries in the world, China's environmental protection scientific research units are determined to take measures to control air pollution.

In 20 14, China's environmental protection scientific research institutions put forward a method to improve air quality and reduce PM 2.5 by manufacturing a super-large air purification equipment. Until 2065438+August 2005, China's environmental research institutions have not found other more effective methods to purify the air.

Later, the idea of this large-scale "haze removal equipment" was re-examined and recognized by some scientists, so the construction of the first equipment was decided in Xi 'an, the capital of Shaanxi Province.

By 2065438+June 2006, the first "haze removal and purification tower" in Xi 'an was successfully built, with a cost of120,000 yuan and an annual operating cost of 200,000 yuan.

The function of "haze removal tower" is unexpected.

This environmental pollution control tower, which was built by the Institute of Earth Environment of Chinese Academy of Sciences and participated by many universities, cost 6.5438+0.2 million yuan and lasted for nearly one year, and did not achieve the expected good results.

The working conditions of Xi 'an Haze Removal Tower are relatively limited. First, it needs to produce a good greenhouse effect, but in the winter with severe smog, it is the season with the weakest light. Secondly, a large amount of flowing air is needed to achieve the expected air purification effect.

Because the haze removal tower uses heat flow theory, particulate pollutant filtration and photocatalytic reaction to reduce the haze factor, it needs long-wave radiation of sunlight to heat the air in the shed to make the hot air flow rise, and the filter walls installed around the bottom of the tower want to purify the passing air, so it requires high air mobility.

The whole haze removal tower consists of an air guide tower and a glass heat collection shed. The height of the cylindrical diversion tower is 60m, and the inner diameter of the tower is10m. Four holes are arranged below 5.5 meters of the tower, which can accommodate 2-4 fans. At the bottom of the tower is a heat collection shed with side lengths of 60 meters and 45 meters respectively; Theoretically, it sounds more like a large air purifier.

Theoretically speaking, the haze removal tower should have remarkable effect, but its practical application in Xi 'an is not ideal. This is not ideal, because its influence range is too small, and the haze removal tower can only play its role within the radius of 10 km.

However, the total area of Xi 'an exceeds 10000 square kilometers. Compared with the effect of eliminating haze towers, in addition, within the effective 10 square kilometers, the average concentration of environmental PM2.5 can only be reduced by 1 1%- 19%, which belongs to moderate and severe air pollution.

Under people's expectation, the function of haze removal tower is not the expected result, but the cost is high and the cost performance is low. Tens of millions of investment, in exchange for such a small range of air purification, people feel that pay and gain are not proportional. Therefore, it attracted a lot of netizens' spit.

The real "haze removal tower"

Today's efforts to reduce smog, such as the construction of the "haze removal tower" and the research and development of air purifiers, are all in the later stage. We should start from the source and prevent the smog from having a chance to "debut". This is the "tower for removing haze" that should really be built.

In today's China, many manufacturing factories erect long chimneys and smoke billows. The smoke in the chimney carries fine dust, which is the main component of the smoke.

Secondly, automobile exhaust emissions and dust released by fireworks and firecrackers on holidays have become "accomplices", resulting in the emergence of haze weather.

Therefore, in order to reduce smog, factories can choose more environmentally friendly materials, and citizens can take more energy-saving travel modes such as bus or subway as much as possible to reduce driving rate and reduce the emission of smog factors.

As the Spring Festival is approaching, we can spend it in a more civilized way, without setting off firecrackers and fireworks, and create a safer, healthier and more environmentally friendly Spring Festival. Change your eating habits a little, and change the outdoor barbecue in the city into an indoor environmental barbecue. In daily life, remember to separate and recycle, and don't throw away harmful wastes such as discarded batteries.

Of course, researchers all over the world are trying their best to remedy the polluted environment. National scientific and technical personnel have not stopped improving the design of haze removal tower for many years. It is believed that finding a more mature method to improve the haze removal tower in Xi 'an can achieve the initial ideal effect.

Of course, I believe that everyone has gradually realized that haze removal is only a solution. To purify the air, we should not rely solely on external forces, but start from ourselves to reduce the damage to the natural air. To some extent, we can say that we are the most effective "haze removal tower".

Summary:

Although the first "haze removal tower" in China did not achieve the expected effect, it is worth mentioning that the haze removal tower was never intended to be widely promoted in a short time at the beginning of its establishment. It can be said to be an experimental project to some extent. Like other experiments, it is impossible to do it well at the beginning, and it takes some time to perfect it.

However, the construction of "haze removal tower" is of great significance in environmental protection propaganda. It should be difficult for the "tower for removing haze" to be self-financing. Compared with other buildings or simple green spaces planned here, the ecological benefits may be higher than the haze removal tower.

However, the construction of the haze removal tower can better highlight Xi 'an's actions in preventing and controlling smog, the efforts made by governments at all levels in environmental protection, and the research projects seen and seen by scientific research departments.

When people see this haze removal tower, they can also increase their confidence in improving the air environment, and naturally they will be more actively involved in the team of protecting the environment and living a low-carbon life.

Although the "smog tower" has not brought much environmental benefits, it can achieve good social benefits and will drive more people, more funds and more research to pay attention to this environmental protection cause. I believe that in the near future, the air in our motherland will become better and the blue sky will become more and more beautiful.

Secondly, we should know that the concept of "haze removal tower" is actually successful, but the theoretical effect has not been fully realized in the initial practice. Researchers have never given up the concept of "haze removal tower". Although the initial experiment failed, the author is willing to believe that a more effective "haze removal tower" will be invented in the near future.