The structural types of dust collector bags include: 1. Divided by the shape of the bag: flat bags (trapezoidal and flat) and round bags (cylindrical). 2. Divided by the air inlet and outlet methods: lower inlet upper outlet, upper inlet lower outlet, and direct current type (only limited to plate-shaped flat bags). 3. Divided by the filtering method of the bag: external filtration type and internal filtration type. Filter materials use fibers, such as cotton fiber, wool fiber, synthetic fiber, and glass fiber, etc., and filter materials woven from different fibers have different properties. Commonly used filter materials are 208 or 901 polyester velvet cloth, with a general operating temperature not exceeding 120°C. Glass fiber filter bags treated with silicone resin generally do not exceed 250°C in operating temperature. Cotton and wool fabrics are generally suitable for non-corrosive environments; the temperature is below 80-90°C containing dusty gases.
Advantages of dust collector bags are: 1. High dust removal efficiency, capable of capturing fine dust particles larger than 0.3 microns, with a dust removal efficiency reaching over 99%. 2. Flexible usage, handling air volume can range from hundreds of cubic meters per hour to hundreds of thousands of cubic meters per hour. It can be set up as a small unit directly placed indoors or near machine tools, or it can be made into a large dust collector room, also known as "bag house". 3. Relatively simple structure, stable operation, lower initial investment, and convenient maintenance.
Currently, commonly used cleaning methods include: 1. Gas cleaning: Gas cleaning uses high-pressure gas or external atmospheric counter-blowing on the filter bag to clear accumulated dust on the filter bag. Gas cleaning includes pulse-jet cleaning, reverse blowing cleaning, and reverse suction cleaning. 2. Mechanical shaking cleaning: divided into top shaking cleaning and middle shaking cleaning (both relative to the filter bag), which use mechanical shaking devices to periodically shake each row of filter bags to clear accumulated dust on the filter bags. 3. Manual tapping: manually tapping each filter bag to clear accumulated dust on the filter bags.