As an important dust removal tool, the bag filter is widely used in China’s chemical and energy companies. The Standard Group mainly provides filter bag filtration efficiency test
ers, focusing on the filtration efficiency and influencing factors of filter bags. This article focuses on introducing you to Analysis of the influence of bag filter work efficiency. The dust removal efficiency of the bag filter is mainly affected by factors such as dust characteristics, filter material characteristics, dust load on the filter bag, and filter wind speed. The following detailed analysis of 7 factors that affect the efficiency of the bag filter. 1. Filter bag material The selection and application of the filter bag material of the bag filter is the core technology of the bag dust collector, which plays a decisive role in the performance of the dust collector. Due to the environment of each dust collection point, the nature, temperature, and technical requirements of the dust to be handled are different, different filter materials should be selected according to different conditions, 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 dust, good air permeability, low resistance, high filtration efficiency, high strength, and can withstand high-intensity cleaning and 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 advancement of the bag filter. The filter wind speed is closely related to the dust concentration of dusty gas, dust particle size, application, viscosity, gas temperature, moisture content and dust removal method. When the dust particle size is finer, the temperature and humidity are higher, the concentration is higher, and the viscosity is higher, the filter wind speed should be lower, otherwise a higher value can be selected. If the filtering wind speed is too high, it will increase the load of the filter bag and increase the filtering 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 clumps to block the ash discharge port of the cone. 4. Heat preservation of the dust collector is also a step that the bag dust collector must do well. Insulation is to keep the gas and avoid damp and paste the bag. The phenomenon of smearing and clogging of most filter bags is caused by low dust temperature and high humidity. 5. Air leakage directly affects the dust collection effect and life of the dust collector, and the air leakage rate is required to be <3%. The bag filter is generally operated under negative pressure, such as air leakage, it is easy to form a small circuit short circuit. The dust collection system does not handle enough air volume, resulting in positive pressure dust. Air leakage will also reduce the temperature of the system, it is easy to form a damp bag, increase the dust collection resistance, and reduce the dust collection effect. 6. The ash discharge cone of the ash hopper is not smoothly discharged, 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 an increase in system resistance. The general interval time is about 4s (adjustable according to the actual production situation) spraying, the spraying time is 0.2s~0.3s, and the time interval between the chamber is about 30s. More about: filter material testing instrument
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