AEC Self Cleaning Continuous Filters - Manual (Page 29)

Self Cleaning Continuous Filter Chapter 3: Installation 28
4. Turn on all dust discharge equipment such as rotary valves, screw conveyors, etc.
Note: A small amount of dust emission may occur during initial start-up, but should
cease after a few hours of operation. If emission continues, inspect the bags
for proper installation.
5. If water vapor or other condensables are present, it will be necessary to preheat the
system so that the surface temperature of the piping and collector are above the dew
point. Dryers, coolers and some grinding systems are common examples.
Note: When the Self Cleaning Continuous Filter is started in cold weather,
condensation may form on the filter tubes and inside surfaces of the housing.
To avoid condensation problems, allow the main system fan to operate
approximately twenty (20) minutes with clean air before allowing materials or
contaminants to enter the air system. At shutdown, allow the timer to operate
thirty (30) minutes after shutting down the main system fan.
6. Start the fan with the fan damper set at about half-flow and run for 30 minutes
because it is good practice to introduce the dust stream to a new bag at a reduced rate.
This is particularly true when very fine solids (less than 2 microns) or high
concentrations are present.
Caution! It is possible to overload the system fan motor during initial start-up. If
motor amperage is excessive, reduce air flow until pressure loss on the Self
Cleaning Continuous Filter stabilizes.
7. Observe the differential pressure gauge. At start-up, the pressure drop will be low.
After 30 minutes of operation the bags will start to be coated, the filtering efficiency
will increase and the pressure differential will start to rise. Then the main fan damper
should be opened to the design setting.
8. When the collector has stabilized (may require eight hours) the differential pressure
should remain steady at some value between 1” and 6” W.G. If it is below 4”
gradually increase the “OFF” time until it reaches 4” W.G. If it is over 4” the “OFF”
time should be decreased until it reaches 4” W.G.
9. Temperature of the system must be controlled to remain below the maximum
temperature capability of the filter bags.
10. The collector is now ready for use.
Shutting Down the Collector
Dust Control and Pneumatic Conveying Systems
1. Turn off the main fan.
2. Wait five to ten minutes and turn off the timer and discharge (auxiliary) equipment.
3. Turn off the compressed air.
Process System
1. Dryers and the system to the collector discharge should be run until empty and heat
maintained at a reduced rate until the collector metal surfaces and filter bags are dry.
2. Perform steps 1 through 3 listed above in the Dust Control and Pneumatic Conveying
System section.