The dust air enters
dedusters tank body through air intake, because the air current
volume expands suddenly, the flow speed reduces suddenly, ash of
which particles are larger separates from the air current including
ash as a result of the collision and the gravity, deposits into ash
bucket of lower tank body. Smaller particles are absorbed
sluggishly into the extine of filter bag due to various effects of
filter bag. The gas which was purified is discharged from air
outlet of top body through filter bag by venturi. As time going,
with the dust which is absorbed by filter bags surface growing,
with the air permeability of filter bag weakening, which causes the
resistance of deduster to increase unceasingly. To ensure the
resistance of deduster to be controlled in a limitative range, with
pulse controller sending signals, electromagnetic pulse valve is
opened following in order, which makes the compressed air in the
gas capsule jet out from each spray orifice of spray pipe to
corresponding venture (called primary wind), and then induces
ambient air (called secondary wind) which is a few times than
primary wind to enter the filter bag when the high-speed airflow
passes the venture, resulting the filter bag rapid expansion in an
instant, because the impact effect of reverse pulse air current
will disappear soon, the filter bag contracts sharply, so this
allows the dust accumulating on the filter bags extine to be
cleared. The falling dust is discharged through the ash discharge
system. Because cleaning proceeds separately toward a few
groups of the filter bag in order, and do not cut off the dust air
which needs to deal, so the processing capacity of deduster remains
invariant in the process of cleaning.
Brief
Introduction of Blowing System:
It is the constitution of blowing system,
impulse valve port A links to the compressed air manifold, port B
links to impulse pipe, the controller gives the orders to control
the control-valve. When the controller doesnt output signals, the
moving iron core of control-valve seals the exhaust port, impulse
valve is power off. When the controller sends signals, the pulse
back pressure chamber and atmosphere are interlinked by
control-valve, pulse valve opening, the compressed air spurts into
venture from gas capsule through pulse valve by the holes of spray
pipe, alters to the instantaneous positive pressure in filter bag,
realizes cleaning.
Pulse Bag
Deduster
DMC60-120 pulse bag collectoris
composed of five main parts.
1. Top body: including upper maintenance gate
and air outlet.
2. Middle body: including perforated plate,
maintenance gate, filter bag, keel, venturi.
3. Lower body: including air intake, ash
bucket, maintenance gate.
4. Ash Discharge System: including spiral
conveyor or star ash valve powered by reducer.
5.Blowing System: including pulse controller,
electromagnet impulse valve, impulse pipe, air
manifold.
Working
Principle
The dust air
enters dedusters tank body through air intake, because the air
current volume expands suddenly, the flow speed reduces suddenly,
ash of which particles are larger separates from the air current
including ash as a result of the collision and the gravity,
deposits into ash bucket of lower tank body. Smaller particles are
absorbed sluggishly into the extine of filter bag due to various
effects of filter bag. The gas which was purified is discharged
from air outlet of top body through filter bag by venturi. As time
going, with the dust which is absorbed by filter bags surface
growing, with the air permeability of filter bag weakening, which
causes the resistance of deduster to increase unceasingly. To
ensure the resistance of deduster to be controlled in a limitative
range, with pulse controller sending signals, electromagnetic pulse
valve is opened following in order, which makes the compressed air
in the gas capsule jet out from each spray orifice of spray pipe to
corresponding venture (called primary wind), and then induces
ambient air (called secondary wind) which is a few times than
primary wind to enter the filter bag when the high-speed airflow
passes the venture, resulting the filter bag rapid expansion in an
instant, because the impact effect of reverse pulse air current
will disappear soon, the filter bag contracts sharply, so this
allows the dust accumulating on the filter bags extine to be
cleared. The falling dust is discharged through the ash discharge
systeBecause cleaning
proceedes separately toward a few groups of
the filter bag in oder, and do not cut off the dust air which needs
to deal, so the processing capacity of deduster remains invariant
in the process of cleaning.
Brief
Introduction of Blowing System:
It
is the
constitution of blowing system, impulse valve port A links to the
compressed air manifold, port B links to impulse pipe, the
controller gives the orders to control the control-valve. When the
controller doesnt output signals, the moving iron core of
control-valve seals the exhaust port, impulse valve is power off.
When the controller sends signals, the pulse back pressure chamber
and atmosphere are interlinked by control-valve, pulse valve
opening, the compressed air spurts into venture from gas capsule
through pulse valve by the holes of spray pipe, alters to the
instantaneous positive pressure in filter bag, realizes
cleaning.
Main Fittings
(1) Pulse
Controller
Pulse
controller is the master control equipment of pulse bag deduster,
it has electronic contactless switch with NPN low frequency high
power triode adopting digital integrated logic, which has a high
level of integration and anti-jamming ability, low power
consumption, when the supply voltage has a relatively large swing,
it still works normally. When operating it does not have the
noise、sparklessly、contactlessly、not have machinery wearing parts,
it has advantages of small volume、light weight、long
lifetime、reliable operation and convenience maintenance. The outer
casing adopts aluminum alloy molding structure, which may install
directly in the main body of deduster or in the screen cabinet of
common control.
(2)
Electromagnet impulse valve
Electromagnet impulse valve is main equipment of
blowing and cleaning system of pulse bag deduster, it is the switch
of blowing compressed air toward the filter bag, is controlled by
output signals of pulse controller. This deduster adopts DMK-type
electromagnet pulse valve, it combines the pulse valve
(differential air valve) with the pilot valve (control valve),
besides the air inlet of valve body and the metal pipe of air
reservoir connected, the valve body itself has no hose connection.
Novelty design, reasonable structure, easy installation, reliable,
long life, small power consumption, valve body adopts
Aluminum-silicon alloy die-casting, has certain anti-corrosion
ability after surface treatment.
(3) Ash
valve and Reducer of ash discharge device
Ash valve has
two kinds: ash seal valve namely spiral conveyor (using gray column
to seal) or rotary ash discharge valve, reducer has two kinds: worm
reducer or less tooth difference reducer, the motor power is 0.75
kilowatts (DMC48-129).
(4) Venturi
(ejector)
It is main
component of inducing the secondary wind and strengthening the
pressure wave of cleaning system, adopts aluminum alloy casting,
has certain mechanical strength, the appropriate measures should be
taken if corrosion protection requirements
appear.
(5) Filter
Bag Frame (keel)
It can support
the filter bag to still remain effective filtration area in the
negative pressure state. It has two kinds: cage type and spring,
the cage is more upright, upward air exhaust conveniently; the
spring surface is bright and clean, the weight is light, the
vibration breadth is large when cleaning, low requirements to the
clean-up height of workshop, two kinds have their characteristics
respectively, selecting according to the service
condition.
(6) Filter
Bag
Filter bag is
the component of filtering dust air. This product adopts 747 and
729 napping industrial polyester fabric for filtration materials
(also to be possible to change to other filtration materials by
users request such as fragrant wind wheel, needle felt), the
ability to endure temperature 120°C (up to 150°C instantaneously),
the permeability and the mechanical strength are pretty
good.
