AEC Self Cleaning Continuous Filters - Manual (Page 30)

Self Cleaning Continuous Filter Chapter 4: Operation 29
Chapter 4: Operation
4-1 Start-up
Standard Start Ups
Note: When new bags are installed, follow the Initial System Start Up Procedure on
the previous pages. Subsequent start ups should begin with all systems off.
Activate the Self Cleaning Continuous Filter in the following sequence:
1. Verify that all filter bags have been installed, all ports, access doors and rotating
equipment (belt guards, etc.) are in place.
2. Turn on the compressed air.
3. After pressure reaches a minimum of 85 psig, turn on the timer.
4. Turn on all of the dust discharge equipment.
5. Turn on the main fan. Preheat the system if necessary.
6. This equipment has been designed to filter 99.9% of dust particles. If the collector
discharge is visible, refer to the Troubleshooting section of this manual.
4-2 Self Cleaning Continuous Filter Operation
When the unit has been activated, the following sequence of events occurs:
Dust-laden air enters the hopper where heavier particles drop out of the air stream. Lighter
particles are trapped in the air stream and rise.
As air passes through the filter bags, dust particles are collected on the outside surface of the
filter bags and the cleaned air is exhausted from the collector.
At precise intervals, jets of high pressure air pass through the venturis, inducing a strong flow
of secondary air, briefly reversing the air flow through the bags.
Shock waves pass down the inside of the bags, flexing the bags outward. The reversed air
flow dislodges accumulated dust from the bag and the dust drops into the hopper.
With this method of cleaning, airflow through a row of bags is reversed for only a fraction of
a second, resulting in steady airflow through the collector. The system is therefore
maintained at steady-state conditions.
Collection operation is controlled by an easily-adjusted solid state timer. A Magnahelic
gauge permits optimum regulation of the timer. Pulse durations and pulse intervals can be
simply and accurately set at the timer to minimize air consumption. See Figure 16 for a
diagram of the process air flow through the collector.