Analysis of Influencing Factors on the Working Efficiency of Filter Bag Dust Collector

As an important dust removal tool, bag filter is widely used in chemical and energy enterprises in China. It mainly provides filter bag filtration efficiency testing-equipment' target='_blank'>tester, focusing on the filtration efficiency and influencing factors of filter bag. This article focuses on introducing you about bag dust removal. Analysis of the impact of the work efficiency of the device. The dust removal efficiency of the bag filter is mainly affected by factors such as dust characteristics, filter material characteristics, accumulated dust load on the filter bag, and filter wind speed. The following is a detailed analysis of 7 factors that affect baghouse efficiency. 1. Filter bag material The selection and application of the filter bag material of the bag filter is the core technology of the bag filter, which plays a decisive role in the performance of the filter. Due to the environment of each dust collection point, the nature, temperature and technical requirements of processing dust are different. According to different conditions, different filter materials should be selected and corresponding technical protection measures should be taken. The requirements for filter bag materials include the following technical properties: filter bag materials are suitable for different temperatures, good peelability, easy to clean, good air permeability, low resistance, high filtration efficiency, high strength, can withstand high-strength cleaning, use Long life and reasonable price. 2. Filtering wind speed Filtering wind speed is a very important parameter that determines the performance of the dust collector, and it is also an important parameter to measure the advanced nature of the bag filter. The filtration wind speed is closely related to the dust concentration, dust particle size, application occasion, viscosity, gas temperature, moisture content and cleaning method of the dust-containing gas. When the particle size of the dust is fine, the temperature and humidity are high, the concentration is high, and the viscosity is high, the filtering wind speed should be lower, otherwise, a higher value can be selected. If the filtration wind speed is too large, it will increase the load of the filter bag and increase the filtration resistance, resulting in a short service life and low efficiency of the filter bag. 3. Leakage The top of the dust collector and the surrounding walls have serious air leakage. When it rains, water will enter, causing paste bags, or wet materials will form agglomerates and block the ash discharge port of the cone. 4. The thermal insulation of the dust collector is also a level that the bag dust collector must do well. Insulation is to keep the gas in and avoid the moisture bag. Most of the filter bags appear smeared and blocked, which is caused by low dust temperature and high humidity. 5. Air leakage Air leakage directly affects the dust collection effect and life of the dust collector, and the air leakage rate is required<3%. Bag-type dust collectors are generally operated under negative pressure, such as air leakage, it is easy to form a small circuit short circuit. The air volume of the dust collection system is not enough to form positive pressure dust. Air leakage will also reduce the temperature of the system, easy to form moisture and paste bags, increase the dust collection resistance, and reduce the dust collection effect. 6. The cone of the ash discharge ash hopper is not smooth in ash discharge, and there is too much ash in the ash hopper, which will block the air inlet and cause poor ventilation. 7. The cleaning interval is too long, and the dust attached to the filter bag cannot be eliminated in time, resulting in increased system resistance. The general interval time is about 4s (which can be adjusted according to the actual production situation), the injection time is 0.2s to 0.3s, and the time interval between chambers is about 30s. More about : Filter Material Testing Instruments

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