Issues regarding flue gas heating in bag filters to prevent bag clogging
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Pulse bag filters are used to treat the flue gas generated by Calordo furnaces; the temperature of this flue gas varies considerably, ranging from room temperature up to 150 degrees. To prevent the filter bags from getting clogged, it is planned to install heating devices on the flue gas pipes and the dust collectors in order to keep the flue gas temperature at 100–120 degrees. Is there any manufacturer that possesses a mature technology for this purpose? Flue gas conditions: Air flow rate of 50,000 cubic meters per hour; initial dust content of 2 grams per standard cubic meter
What is the filtration area of your bag dust collectors? Equipped with a fan of 50,000 m3/h, what about the air pressure?
I suggest that you could follow the approach used in sulfuric acid production lines by installing a suitable circuit and adding temperature control
Also, could it be that the temperature is unstable, there is a high amount of moisture in the gas, and the condensation water along with dust and sludge clog the openings in the filter bags, preventing them from functioning properly?
For such operating conditions, steam tracing can be considered; steam tracing pipes can be installed on the flue gas ducts and dust collectors. If the flue gas is discharged after the dust collector (in a pre-treatment exhaust gas processing system), make-up air can be used to reduce the water vapor saturation of the flue gas. As long as the flue gas is not saturated with water vapor, the filter bags will not get clogged.
Generally, to be honest, using a bag filter results in less heating of the flue gas. Because when the flue gas temperature is high, the filter bags can sometimes catch fire instead. If you are concerned about bag clogging, you can consider adding a cyclone tank in front of the bag dust collector to reduce the dust load first, and then you can think about insulating the pipes. As long as the temperature doesn’t drop below the dew point, that’s fine. No, you can consider adding a heating strip or blowing hot air inside.
Why can’t air be drawn out after the bag filter is installed?
Is the air volume delivered by the fan low? Is the inner diameter of the pipe small?