The application prospects of pulse bag filter technology in the non-ferrous metal smelting industry: In recent years, China's non-ferrous metal industry has developed and has become a major producer and consumer of non-ferrous metals. The non-ferrous metal industry has developed the investment in the non-ferrous metal smelting industry. The fixed assets investment in China's non-ferrous metal smelting and rolling processing industry has generally maintained growth, with an annual compound growth rate of 40.19%. The development of the non-ferrous metal smelting industry has driven the demand for pulse bag filters. The "Plan for the Adjustment and Revitalization of Nonferrous Metals" passed by the State Council proposes the overall guiding ideology of stabilizing and expanding the domestic market, controlling the total amount, eliminating backward production capacity, strengthening technological transformation, and promoting enterprise restructuring to promote the structural adjustment and optimization upgrading of the non-ferrous metal industry, and the sustainable development of the non-ferrous metal industry. At the same time, it is proposed to accelerate technological transformation, improve the level of process equipment and product quality, increase product varieties, and reduce resource and energy consumption. Actively implement measures to expand domestic demand, product structure, increase supply, and meet the demand for non-ferrous metal products in downstream industries such as electricity, transportation, construction, machinery, and light industry. Adapting to the needs of aviation, aerospace, and higher industries, vigorously developing new products and materials, cultivating new consumption growth points, and stabilizing and expanding the domestic market. The above measures have played a powerful role in the sustained and healthy development of the non-ferrous metal industry. The structural adjustment of China's non-ferrous metal industry and domestic demand stimulus policies will bring a new round of growth opportunities to the pulse bag filter industry. Characteristics of dust pollution in the metallurgical industry: (1) The emission of dust pollutants is large. Many enterprises in China's metallurgical industry were founded in the 1950s. Due to outdated equipment, outdated processes, and limitations in process conditions, the operation of existing dust removal systems is not satisfactory. In addition, the dust collection facilities are not reasonable. Many enterprises have serious dust pollution in their factory areas, with large dust emissions and severe air pollution in the surrounding area. Many metallurgical enterprises in our country are located adjacent to urban areas, which has led to social conflicts and frequent civil disputes between residents and enterprises. (2) The types of dust pollution are complex. The metallurgical industry has a wide variety of products and complex processes, ranging from mining to smelting, from black to colored. Depending on the differences in products and processes, the types, geometric characteristics (dispersion), and physical properties of dust also vary. Due to the complex types of dust in the metallurgical industry, high requirements have been put forward for dust removal equipment, especially in non-ferrous smelting enterprises, where toxic substances such as mercury, chromium oxide, lead, etc. are emitted in the dust. (3) The particle size distribution of dust varies greatly. The significant differences in dust particle size distribution in the metallurgical industry are caused by different processes and operating conditions. For example, in different processes such as mining, beneficiation, sintering, and smelting, the particle size distribution of dust varies greatly. (4) High labor intensity and poor hygiene conditions in the workshop. Most enterprises in the metallurgical industry still use traditional processes, resulting in high labor intensity and low mechanization rates. The amount of dust emitted in workshops is also high, and many workshops are polluted. The air quality (IAQ) does not meet the requirements of the "Industrial Enterprise Design Hygiene Standards" (TJ36-79). In recent years, there has been an increasing trend of occupational disease patients caused by dust pollution in some enterprises, resulting in direct and indirect economic losses and social impacts for the enterprises. Pulse bag filter is an environmentally friendly dust removal equipment that separates dust through mechanisms such as screening inertia collision, interception, diffusion, and gravity. It is widely used in environmental dust removal in the metallurgical industry. It mainly relies on filter bags to filter dust particles, so that dust is trapped on the bag to achieve the purpose of dust removal. The filtering process is mainly divided into two stages: the stage forms the initial layer of dust, and the filtering process is mainly carried out in the stage. The main reason for its capture is the formation of the initial layer of dust on the filter material. When cleaning, the initial layer of dust should be maintained. Filtering and cleaning can cause a significant decrease in efficiency and damage to the filter bag. Therefore, the main factors affecting the capture efficiency of pulse bag filter are: dust characteristics, filter material characteristics, dust layer thickness, and filtering speed. Waiting for operational parameters. From the trend of development, pulse bag dust collectors have a tendency to be replaced by electrostatic precipitators in many occasions. In some developed countries, there are many new types of dust collectors in recent years, mainly including flat bag side inserted pulse dust collectors, cylindrical folding pulse dust collectors, electrostatic pulse bag dust collectors, etc. In terms of filter media, the successful development of microporous membrane composite filter media is a breakthrough. The microporous membrane composite filter material was successfully developed by GORE company and widely used in pulse bag filter technology, which is a major breakthrough in filtration technology. This composite filter material is coated with a polytetrafluoroethylene microporous film on the surface of a conventional filter material. The film has the inherent good properties of polytetrafluoroethylene, such as chemical stability, smooth surface, friction coefficient, resistance to high and low temperatures, and hydrophobicity. After expansion treatment, it also has microporous and breathable properties. Its pore size is generally between 0.2~5 μ m, with a porosity of about 80%. Micro porous membrane composite filter material has multiple advantages in filtration, which is one order of magnitude higher than ordinary filter material; The running resistance is significantly reduced, about 2/3 of that of ordinary filter materials, saving energy; Good dust cleaning performance and long service life; Widely applicable and capable of operating under high humidity dusty airflow conditions. In recent years, China has adopted new pulse bag dust collectors in construction and renovation projects.
