Factors affecting dust collection efficiency of bag filter
A. Filter bag material
The selection and application of bag filter bag material is the core technology of bag type dust collection equipment and 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 treatment are not the same. Different filter materials should be selected for different conditions and corresponding technical protection measures should be taken. The requirements for the filter bag material include the following technical properties: The filter bag material is suitable for different temperatures, good peelability, easy cleaning, good air permeability, low resistance, high filtration efficiency, high strength, can withstand high-intensity cleaning, use Long life and affordable price.
B. Filtering wind speed
The filter 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 dust collector. The filtration wind speed is closely related to the dust concentration of dust-laden gas, dust particle size, application, viscosity, gas temperature, moisture content and cleaning methods. When the dust particle size is finer, the temperature and humidity are higher, the concentration is greater, and the viscosity is larger, the filter wind speed should be taken lower, and vice versa. If the filtration speed is too high, it will increase the load of the filter bag and increase the filtration resistance, which will lead to a short service life and low efficiency of the filter bag.
C. Leakage
Leakage directly affects the dust collection effect and life of the dust collector and requires a leakage rate of <3%. Bag type dust collectors are generally under negative pressure operation, such as the leakage circuit is easy to form a small loop short circuit. The dust collection system handles insufficient air flow to create positive pressure dust. Leakage will also reduce the system temperature, easy to make bags of moisture, increase dust collection resistance, and reduce dust collection.
D. Insulation
Insulation is also a must for bag collectors. Insulation is to keep the gas and to avoid knots. The phenomenon of smearing and clogging of most filter bags is caused by low dust temperature and high humidity.
E. Cleaning interval
If the cleaning interval is too long, the dust attached to the filter bag cannot be eliminated in time, causing increased system resistance. The general interval time is about 4s (adjustable according to actual production conditions). The injection time is 0.2s~0.3s, and the time interval between room and room is about 30s.
F. Ash removal
The ash bucket cones are not well drained, and there are too many ash deposits in the ash bucket, which will block the air inlet and cause poor ventilation.
G. Leakage
The air leakage at the top of the dust collector and surrounding walls is serious. When it rains, it will enter the water, causing a paste bag, or the wet material will form a mass to block the part of the cone.