Pulse-cleaned Air Filtration
Systems
Inlet Pulse systems using automatic pulse-jet cleaning of
cartridge media
In a pulse-cleaned system, the filter bank may be periodically cleaned, removing
accumulated dust load. A digital control directs bursts of compressed air onto
cartridges of filter media and dust is collected below the filter house for periodic
removal.
What type of filter cleaning do I need?
If your location expects to see high ambient dust loads for extended periods, or the
local environment has changed since installation, you may need to consider a
pulse-cleaned system. If the OEM equipment was originally designed to rigid cost
constraints, a pulse-cleaned system may not have originally been selected even
though the environment could benefit from it.
If dust loads are expected to be low and local studies have always shown low
levels, a static air filtration system may be sufficient. A turbine air filtration expert
can help you decide.
How does a pulse-cleaned system work?
The dust that is collected on cylindrical cartridges is periodically
removed by short pulses of compressed air directed from the inside of
the cartridge. Pulse-cleaning is typically performed by row of cartridges
and rows are pulsed sequentially, governed by a digital control timer.
Cleaning may be programmed for the entire bank of filters, on a timed
repetitive basis, but more efficiently and sustainably by sensing
increases in differential pressure across the filter elements. In this case
pulsing only takes place when a differential pressure threshold is
exceeded (on-demand cleaning).
How do I tell the difference between crossflow and updraft
systems?
In a crossflow inlet design, two cartridges - one cylindrical and one conical – are
installed one behind the other over a support cradle. These cartridge pairs are
clamped in horizontal rows onto a vertical aperture plate (grid plate). Unfiltered air
enters the inlet filter system through weather hoods located immediately upstream
of the filter cartridges and then passes horizontally and radially inward through the
filter medium. The filtered air exits the cartridge horizontally through the grid plate
into a clean air plenum located immediately downstream.
How Reverse Pulse Filter
Cleaning Systems Work
Reverse Pulse Cleaning Systems are an important piece of pneumatic conveying
systems because in a typical pneumatic conveying system, the conveying air is
separated in the filter separator, and the filters are cleaned by a jet of compressed air
in a reverse direction.
The short-duration pulse jet of compressed air helps to dislodge the fine particles
attached to the filters.
The main components are:
• Compressed air reservoir which holds the amount of air required for the pulsing
• Pulse Valve with a solenoid valve which opens up to inject compressed air into the
filters in reverse direction
• A timer in PLC to control the frequency of pulsing
