How to realize the emission standard of bag filter

Under the situation of total smoke emission control, bag filter will become a fair and best choice. The State has revised the Law on the Prevention and Control of Air Pollution, and the emission standards are more stringent. The control of sulfur dioxide in flue gas increases the dust specific resistance, which makes the application of electrostatic precipitator difficult and uneconomical. The biggest advantage of dust bag is that it has high dust removal efficiency and is not affected by the change of dust specific resistance. For example, Baosteel set the internal control emission standard of dust removal bag at 35mg/m3, and Shougang recently set it at 30mg/m3, which has reached the emission standards in Europe and America. Electrostatic precipitator is difficult to meet this requirement, while domestic bag filter is easy to meet. In some steel mills and cement plants, some electrostatic precipitators have been transformed into dust bags. After transformation, the dust emission concentration is reduced, and the operation cost and maintenance workload are lower than those of electrostatic precipitator. Due to the increasingly strict environmental protection emission standards, a large number of electrostatic precipitators will be gradually transformed into bag filters, which is consistent with the development trend abroad.

According to the corresponding classification method, dust bags can be divided into certain types, which show important performance and function in the corresponding dust removal industry and meet the use needs of the dust removal industry.

The following Gongyi Yili introduces the classification of dust bags for everyone:

1. According to the air inlet and outlet modes, it can be divided into: lower air inlet, upper air outlet, upper air inlet, lower air outlet and direct flow type (flat bag only).

2. According to the shape of the filter bag, it can be divided into flat bag (trapezoidal and flat) and round bag (cylindrical).

3. According to the filtering mode of dust bag, it can be divided into external filtering type and internal filtering type. The fibers used as filter materials include cotton fiber, wool fiber, synthetic fiber and glass fiber, and the filter materials woven from different fibers have different properties. The commonly used filter material is 208 or 90 1 polyester flannel, and the use temperature generally does not exceed 120℃. The service temperature of glass fiber filter bag treated with silicone resin is generally not more than 250℃, and cotton wool fabric is generally suitable for non-corrosiveness. Dust-bearing gas with temperature lower than 80-90℃.

Some domestic dust bag manufacturers have been inspired, and the business focus of enterprises has also shifted to service-centered, and new property management has been carried out for users' dust bags. After several years of practice, it has been proved that this is an effective method to effectively improve the efficiency of environmental protection funds invested by the state and enterprises. At the same time, the economic benefits of dust bag production enterprises have been steadily improved.