The main methods of ash removal include:
1, Gas cleaning: gas cleaning is by means of high pressure gas or external atmosphere back blowing filter bag, in order to remove the accumulated dust on the filter bag.Gas ash removal includes pulse jet ash removal, anti - blowing dust removal and anti - suction dust removal.
2, Mechanical vibrating to remove dust: it can be divided into top vibrating to remove dust and middle vibrating to remove dust (both for filter bags). It is to periodically vibrate each row of filter bags with the help of mechanical vibrating device to remove the accumulated dust on the filter bags.
3 , Manual beating: it is to beat each filter bag manually to remove the accumulated dust on the filter bag.
Maintenance methods
Check the operation of control valve, pulse valve and timer frequently.
The failure of rubber diaphragm of pulse valve is a common fault of bag filter, which directly affects the effect of ash removal.This equipment belongs to the external filter type, the bag inside the frame, to check whether the parts to fix the filter bag is loose, the tension of the filter bag is appropriate.Support frame is smooth to prevent wear of filter bag.Compressed air is used for ash removal.Therefore, it is required to remove oil mist and water droplets, and the oil-water separator must be cleaned frequently to prevent the failure of the motion mechanism and the blockage of the filter bag.
Whether the air volume and pressure and temperature at each test point are consistent with the design.
The installation of the filter bag, whether there is bag loss, loosening, wear and other conditions after use, can be judged by visual inspection of the discharge condition of the chimney after operation.
Prevent condensation
In use to prevent the gas cooling in the bag room to below the dew point, especially in the use of negative pressure bag filter should pay more attention.Because its shell often has air leakage into, make the bag room gas temperature lower than the dew point, the filter bag will be damp, resulting in dust is not loose, but sticky to adhere to the filter bag, the fabric hole closed, resulting in dust removal failure, so that the pressure drop is too large, can not continue to run, some produce paste bag can not dust.
To prevent condensation, the temperature of the gas in the precipitator and its system must be kept higher than its dew point of 25 ~ 35 ° c (such as the dew point temperature of the kiln mill all-in-one machine 58 ° c, the operating temperature should be above 90 ° c), in order to ensure a good use of the filter bag.