(1), the general bag filter bag filter compartment structure, and the left margin in the design. Filter compartment can be rotated maintenance, without affecting the operation of the boiler. Therefore, the impact on the availability of boiler equipment close to zero. (2), baghouse dust discharged from the concentration ratio of the nature of the resistance, concentration and granularity of. Boiler load changes, the flue gas volume fluctuations have little effect on exports baghouse emission concentration. (3) as a key issue bag filter bag filter – the filter material, and now there are breakthroughs in life in general more than two years, in fact, there are up to 4 – 6 years of performance. (4), the discharge baghouse dust concentration is low, generally less than 50mg / Nm3, and even less than 20mg / Nm3. For low sulfur and high ash coal, electricity precipitator to achieve such a low concentration it is very difficult, or more to increase the investment (ie, more conventional 3 farm field to expand to 4-6). (5), bag filter in dry, semi-dry desulphurization system, further reducing the role of the SO2 contained in the flue gas. (6), since the bag filter trapping fine dust more effectively, it is removed to remove the fly ash contained in the rare metal particles than ESP, but also for PM10, PM2.5 fine dust can be removed effectively reduce the crowd around the body health hazards. Cleaning bag filter having a kinetic energy, high cleaning efficiency. And small size, light weight, simple and compact structure, easy to install, easy maintenance (outside the filter type), widely used in building materials, metallurgy, mining, chemical, coal, non-metallic mineral ultrafine powder processing industry dusty gas purification system, is the ideal equipment for environmental dust.