Dust collector bag is the most critical part of bag filter. The nature of filter bag is related to the nature of fiber itself, but also related to the surface structure and Chengdu. Temperature resistance, resistance to installation, etc. are the basic requirements for filter media.
Basic requirements for filter materials in dust removal process of bag filter
1, to meet the dust removal efficiency requirements. In general, the structure of the filter cloth should be selected according to the dust removal intensity of the filter bag.
2, to meet the cleaning requirements. The resistance of the filter bag to maintain economic operation is 800-1500Pa. In addition to the rational selection of cleaning methods, the filter cloth is also required to be easily cleaned. If cotton fabrics are used as filter bags, the temperature will drop rapidly if the temperature exceeds 80°C. At this lower temperature, the condensation threatens to filter dusty fumes. The operating temperature of the glass fiber filter bag can reach 280°C. It not only does not burn the filter bag and the smoke condenses, but also often directly treats the exhaust gas from the waste heat boiler. The collection efficiency of the fiberglass filter bag is very good, because the finer the fiber, the higher the filtration efficiency. However, the price of fine fibers is high, and the resistance is also larger than that of coarse fibers, and the finer the corrosion resistance, the smaller the fiber diameter is. General filter dust removal does not require the use of very fine glass fibers.
3, to meet the air permeability requirements. The breathability of the fabric filter bag is an important filter property, and the water absorbency of the fabric also has a decisive influence on the air permeability.
What are the requirements of the dust-laden gas on the filter bag filter?
1. The basic requirements of the bag filter for dust removal at room temperature. There are two methods of use when bag filter is used under normal temperature conditions, ie discontinuous use and continuous use. The former is simple and is the current development trend. When the time of discontinuous use is long, the filtering speed of the filter bag is small, and the bag filter is cleaned after the car is stopped. This method simplifies the operation, creates conditions for the convenience of use, and meets the operating characteristics of the auxiliary equipment. . Dust-laden gas does not have a high quality requirement for glass fiber flat bag filter media. Generally, it adopts low-end common medium alkali cloth, twill weave, and thicker.
2. The basic requirements for filter bags under high temperature conditions. The continuous operation of the dust collector is a feature of high temperature flue gas dust removal. Continuous work means that the production cycle is very long. The filter bags require a relatively small period of cleaning and a relatively short period of use. This method of use will inevitably cause a continuous increase in the resistance of the filter bag.
