Views: 0 Author: Site Editor Publish Time: 2022-12-19 Origin: Site
Asphalt mixing equipment is to connect each relatively independent unit to form a system with the main mixer as the center. These units mainly include: cold silo unit, drying drum, burner, hot aggregate elevator, vibrating screen, metering system, mixing cylinder, finished silo, asphalt heating system, dust removal system, powder system, control system, pneumatic system and so on.
Asphalt mixture and bag type filter after a stage of use, the filter material (cloth bag) for various reasons will be damaged and leaked, or "paste bag", must be replaced in the maintenance. At this time, what kind of filter material to choose causes people to think.
Asphalt dust filter bag needs to have the following characteristics:
Excellent temperature resistance: continuous operation at 204℃ (instant temperature 240℃), and can withstand repeated 240℃ instant temperature fluctuations.
Two, outstanding dimensional stability: at the temperature of 204℃, only less than 1% of the thermal shrinkage rate, with excellent high temperature stability.
Three, impressive fire resistance: decomposition and carbonization began at 400℃, limit oxygen index (LOI) is 30, neither spontaneous combustion nor combustion.
Four, good chemical resistance: low concentration of acid and base and most hydrocarbons will not affect it, even a small amount of fluoride will not be significantly corroded;
According to the dust collector working condition of concrete mixing building, Jiangsu Aokai summarized the commonly used filter materials of asphalt mixing station are: Aramide, Nomex, Cornais, aramide composite filter materials, etc.
Asphalt mixing equipment using heavy oil, coal or other impurities as fuel, it is necessary to aramid, NOMEX and other needled felt filter material to take different ways of post-processing, in order to adapt to different use requirements. Especially, if asphalt mixing uses heavy oil with high sulfur content and impurity oil as fuel, or its raw material has high water content, the dust of asphalt mixing equipment will be sticky and the flue gas composition will be acidic. Therefore, the use of acid proof, oil proof and waterproof treatment of arylon, NOMEX needled felt and other filter material, can greatly improve the wear resistance, high resistance, acid and alkaline resistance, hydrolysis resistance and dimensional stability of needled felt filter material, improve the dust cleaning performance and dust removal efficiency of the filter bag and the service life of the bag. Therefore, NOMEX and aramide high temperature resistant needled felt filter material is the ideal filter material for asphalt concrete equipment dust collector, and long-term use can maintain high strength, high wear resistance.