The complete Astec baghouse system consists of a primary dust collector (cyclone or inertial separator), an enclosed fabric filter structure (baghouse), and a draft package which includes fan, Variable Frequency Drive and duct work.
Inertial separators depend on rapid changes in both gas stream velocity and flow direction to remove coarse particles from the air stream. Using advanced modeling technologies and practical in-field experience, Astec engineers have been able to precisely set the internal baffles for efficiency comparable to the cyclone at a lower price.
For the greatest possible efficiency, Astec cyclones use centrifugal force to sling particles toward the walls, where friction from impact scrubs the coarse particles from the gas stream. Fine particles, those below 75-micron, do not travel along the outer edge of the streamlines as do coarse particles. They will be vented from the cyclone and then ducted into the baghouse for capture.
Astec Fans Maintain Stable Airflow
The Astec exhaust fan maintains stable airfl ow over a wide range of operating conditions and is capable of operating at high differential pressures (up to 20-inch water column). The fan's backward-curved blade runs quieter and uses less power than other fan designs. The drives can be configured to be driven either by belts and sheaves or direct. Optional stack silencers are also available.
Variable Frequency Drive Saves Money
The optional Variable Frequency Drive or VFD provides the smoothest and most linear airflow control with the lowest power consumption. A pressure sensor at the burner monitors air intake and controls fan speed to deliver the optimum airflow.
The VFD provides important effi ciency benefits that reduce your operating cost by minimizing amount of air to heat, exhaust fan power consumption, gas velocity through the drum, dust through the baghouse, and air-to-cloth ratio while maximizing performance.