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Pulse Jet Baghouse Dust Collectors are also commonly spelled Pulse-Jet Dust
Collector or PulseJet Dustcollector. See other pages for accessories like Torit
cartridges, filters, and industrial blower / fan repair.
Click Here information:
Standard PulseJet
Baghouse Dust Collectors
High Header Pulse Jet
Baghouse Dustcollector
High Inlet Pulse Jet
Baghouse Dust Collectors
High Pressure Pulse-Jet
Baghouse Dust Collector |
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Cliff Mansfield
To correct this problem at these plants I added a
“manual” pulsing mode so that we could set the baghouse up to be pulsed any
time the plant is running, regardless of the “pressure differential”. This
way a constant amount of baghouse dust is being added to the mixing process.
I used the manual settings on the pulse card to set the “pressure
differential” to 4”. The downside of this is that the plant operator must
adjust the pulse card himself to assure the “pressure differential” stays in
the range he wants. This “inconvenience” is far outweighed by the
improvement in dust control and improved mix consistency. This change can be
implemented at your plant for perhaps $500, maybe less. It simply requires
some wire, a switch and someone to do it.
I’ve changed many plants, both drum and batch, to this configuration and
have seen a significant improvement in mix quality and more consistent
sample results.
A secondary issue that contributes to dust related sample problems is
start-up and shut-down protocols. When we start our plants the majority of
them will exhibit an elevated level of dust for a short period of time. This
material is added to our mixing process regardless of the amount of
aggregates coming in. On a batch plant this can contribute to surges of
fines into #1 bin, especially if the plant doesn’t use a dust run around
system. On a drum plant it means we have to waste material onto the ground
through our reject chute. During daily operations a plant can be started and
stopped many times which leads to a considerable amount of rejected
material. It also leads to poor quality mix for a short period of time, due
to an elevated level fines. To combat these problems I advocate the use of
hot-stop or mid-stream stops during normal daily operations at all plants,
including batch plants.
A hot-stop is performed as follows: When the time comes to shut down you
would first switch your burner control and asphalt control (on a drum plant)
to manual, note the burner position, then kill the feeders. When the
aggregates stop falling into the dryer, kill the dryer, the burner, the
fans, divert the oil on a drum plant, turn off the baghouse pulse control
and any associated blowers/augers, then close the damper.
To restart the plant: Start the main fan and the burner fan. Once the burner
controls go through their ‘purge’ cycle you can light the burner, open the
damper and start the aggregates. When the rock spills into the dryer you
would start the dryer, turn on the baghouse pulse control and any associated
blowers/augers, then either restart the oil injection on a drum plant or
restart the batching process on a batch plant. Next, ramp your burner up to
the last run position. You are now back to full production in less than two
minutes.
If you do these operations correctly you should have no wasted materials and
a very smooth transition from running to stopped and vice versa. One note:
The temperature of the aggregates in your drum is what controls how long you
can remain hot-stopped. On hot summer days I’ve set for as long as three
hours with little adverse affect. On a cold, windy day in Alaska the down
time will be considerably shorter. Given the improvement in mix quality due
to even fines distribution and considering the abbreviated start-up time,
hot-stops have become a matter of course in my training regimens.
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