The Experimental Study Of Air Filter Re-cleaning Based On Ultrasonic Method

The update iteration of air filters has been an important development in the air purification over the past 100 years.It provides good air quality for people living by using air filters.However,the internal air filters materials fibers covered with dust when the air filters working for a long time.As a result,the effect of filtration efficiency was reduced deeply.The replacement and cleaning of air filter materials had been attracted much attention than ever.The existing cleaning methods such as rapping,pulse,and spraying will cause secondary dusting,uneven cleaning,and complicated processes.Based on those reasons,the ultrasonic cleaning for air filter material was studied deeply in this paper in order to the purpose of re-use.It will not only have extremely high economic value,but also has an important environmental protection significance.In this research,the mechanism responsible for ultrasonic cleaning,effect factors on ultrasonic cleaning,the implementation of ultrasound into process parameters of two materials air filtration materials were evaluated.In initial studies,the air filtration material was fouled by dust in the experiments and subsequently subjected ultrasound in a separate ultrasonic cleaning vessel at different power intensities,cleaning times,and with different cleaning media of treatment.Results indicate that for polyester material C4 suggested 400 W of ultrasonic power and 107 s of cleaning time for ultrasonic cleaning,and for non-woven material Z3 suggested 120 W of ultrasonic power and 14 s of cleaning time for ultrasonic cleaning.These process parameters suggest that the removal of dust from the internal fiber surface of the air filtration material and the energy generated by the formation and collapse of ultrasonic cavitation bubbles are particularly important.In further studies,only one dust repeated ultrasonic cleaning and repeated dust repeated ultrasonic cleaning of the two working conditions were experiments.The cleaning fluid was changed from water to air conditioning cleaning fluid for the investigation of the cleaning effect,and concluded the following.(1)In a dust repeated ultrasonic cleaning conditions: polyester material C4 for PM10 in ultrasonic cleaning 4 times,PM2.5 in ultrasonic cleaning 2 times,the filter performance can be restored to more than 85% of the filter performance of the clean filter media before cleaning,and the resistance characteristics have not changed significantly;non-woven material Z3 for PM10 in ultrasonic cleaning 4 times,PM2.5 in ultrasonic cleaning 3 times,the filter performance can be restored to more than 85% of the filter performance of the clean filter media before cleaning,and a slight decrease in resistance.The filtration performance can be restored to more than 85% of the filtration performance of the clean filter media before cleaning,and the resistance is slightly reduced.(2)In repeated dust and repeated ultrasonic cleaning conditions: polyester material C4 for PM10 in ultrasonic cleaning 8 times,PM2.5 in ultrasonic cleaning 1time,the filter performance can be restored to more than 85% of the filter performance of clean media before cleaning,no significant change in resistance characteristics;non-woven material Z3 for PM10 in ultrasonic cleaning 6 times,PM2.5 in ultrasonic cleaning 4 times,the filter performance can be restored to more than 85% of the filter performance of clean media before cleaning,resistance is not significantly changed;non-woven material Z3 for PM10 in ultrasonic cleaning 6 times,PM2.5 in ultrasonic cleaning 4 times.When cleaning for PM10 6 times,PM2.5 4 times,the filtration performance can be restored to more than 85% of the filtration performance of clean filter media before cleaning,and the resistance is slightly reduced.(3)In the same working condition,by studying different cleaning media,it is found that ultrasonic cleaning of polyester material C4 and non-woven material Z3 with air conditioning cleaning agent can restore the filter media to better filtration performance.