High temperature bag dedusting technology "polishes" the blue sky

In mid-October, haze enveloped the capital again and again, again and again. Among the parents of a kindergarten, Ms. Lin, the mother of a 5-year-old child, kept asking anxiously: "haze is so serious, is there an air purifier in the classroom?"

In the end, she got an affirmative answer and a little comfort. Although as an adult, she clearly understands that there are eggs under the cover of the nest.

At present, the most serious areas of fine particle pollution in the world are North Africa and North, East and Central China. The average annual concentration of fine particles in most parts of China is close to 80 micrograms per cubic meter, which is about 8 times of the safety value set by the World Health Organization (10 micrograms per cubic meter per year). The air pollution situation is serious. Data show that industrial pollution is the largest source of PM2.5 in China, among which cement manufacturing, coal-fired power stations and iron and steel metallurgy are the three major killers of industrial pollution sources.

Industrial dust removal is a key link that can not be ignored in the treatment of PM2.5. Then, how to improve industrial dust removal technology, through technical means to ensure production, but also reduce dust emissions, has become the key issue of air pollution prevention and control.

"bag dedusting technology is an effective way to prevent air pollution and reduce industrial dust emissions. The application of high-temperature filter materials based on high-tech fiber is the key to the application of bag dedusting technology." Cao Xuejun, deputy director of the Consumer goods Industry Department of the Ministry of Industry and Information Technology, said at the "China Textile International Science and Technology Forum-Development and Application of High temperature bag Dust removal Technology" held in mid-October.

The so-called bag dust removal is to rely on the filter bag made of fiber filter material to purify the gas. In all kinds of dust removal devices, bag dust collector is a kind of high dust filter efficiency, for almost all dust in general industry, its dust removal efficiency may reach more than 99%.

"China is the largest user of fossil energy in the world. With the development of power and cement industries, Chinese enterprises have also begun to implement European standards in the international market, with stringent emission standards and strong accountability." Xia Qianjun, general manager of Nanjing Jihua 3521 Special equipment Co., Ltd., believes that "the driving force for the progress of high-temperature bag dedusting technology comes from huge demand."

Liu Jingxian, director of the filter Media testing Center of Northeastern University, told reporters that at present, the performance of filter media produced by domestic enterprises has been comparable to that of foreign brands, but the product stability is poor, at the same time, there is a lack of industry self-discipline, low-price competition and other phenomena.

According to reports, as the organizer of the China Textile Science and Technology Forum, the China Textile Science Research Institute has undertaken the construction of a public service platform for the development and application of high-temperature bag filter media supported by the Ministry of Industry and Information Technology. The aim is to provide filter bag production and application enterprises with filter bag quality and performance evaluation, new filter media technology development, waste filter bag recycling and other industry common services. With the development of the platform, it will play an important role for the healthy and sustainable development of the high temperature filter media industry.

In the industry, it is recognized that the filter material is the "heart" of bag dedusting technology. With the popularization of bag dedusting technology, the requirement of textile filter material, which is the material of cloth bag, is also increasing, and the original textile filter material can not meet the growing technical demand.

"in the past five years, the textile industry for filtration and separation has grown at an average annual rate of 14.7%. Major breakthroughs have been made in key products and technologies, such as gradient filter media, ultra-fine fiber filter media, polytetrafluoroethylene, foaming coatings and so on. the bag dedusting technology has achieved a fine particle dust emission concentration of less than 10 mg per cubic meter, or even reached the ultra-clean emission level, and the filter bag life has reached more than 4 years. The proportion of bag dedusting applications in coal-fired power plants has increased from 10% to more than 20%. " Li Lingshen, vice president of China Textile Industry Federation and president of China Industrial Textile Industry Association, concluded. (reporter Guan Jingjing)