Ash Handling Screw Conveyors
Extreme-duty, abrasion-resistant screw conveyors for moving fly ash and bottom ash away from boilers. Designs include upgraded AR400 or Tri-Braze flights and upgraded materials of construction in the troughs for long-life in a harsh application. Fly ash at 250° F and bottom ash at 600-700° F require materials and designs that tolerate continuous exposure to elevated temperatures.
- Fly ash dust collection
- Bottom ash collection systems
- Biomass-fired power generation
- Sawmill/board plant co-generation
- Pulp & paper co-generation
Materials and engineered designs assure a minimum of two years of operation before rebuilding might be considered.
Exceptionally straight-running screws (TIR of < 0.010” at the shafts and 1/16” at mid-span) to minimize deflective wear on troughs and on bushings, bearings and trough ends – reducing maintenance and repair costs.
Straight-running, properly-designed screws draw significantly less power – up to 50% less depending on the comparison.
Abrasive applications where “off the shelf” screws wear out too quickly; increasing cost of ownership, threatening unplanned downtime, and/or disrupting power or steam production.
How It Works
- Full-pitch screws engineered for relatively light loading of 25-30%.
- Hard-facing on flights and pipe is typically not required; carbon steel pipe with wall thickness capable of minimal deflection is usually enough.
- Mild steel flights wear out too quickly in most applications; upgrade to AR400 or Tri-Braze flights is recommended with Tri-Braze the preference for ash with high silica content.
- Precision-bored pipe with matched bushings are a must for straight-running screws.
|Material Types||Fly ash at a typical bulk density of 30-45 lbs/ft³ with a very small/fine particle size distribution; little to no foreign, non-ash material; temperatures typically in the range of 250° F.|
Bottom ash at an approximate bulk density of 40-45 lbs./ft³; granular structure, often with chunks and, in some fluidized-bed boiler systems, fused glass clinkers; typically, much hotter than fly ash with temperature in the range of 600-700° F or more.
|Power Requirements||Drive motors powered by|
230/460V 3Ph 60Hz
575V 3Ph 60Hz
Other voltages and frequencies available
Zero speed sensors operate at control voltage
VFD’s operate single-phase up to system voltage
Let our applications specialists help you with your extreme-duty bulk material handling needs.