Ground Rice Hull Ash

Ground Rice Hull Ash

Ground Rice Hull Ash


After the customer purchased four x 12/12 Denseveyor pneumatic conveying systems to fuel supply of ground rice hulls to a biomass boiler, they followed-up by purchasing reliable Ashveyor bottom ash systems from Macawber to handle ash collected from a dust collector and ESP, as well as bottom ash. The customer was chiefly interested in eliminating dusty conditions and pipe blockages which necessitated a lot of hosing down and near constant labor. Our customer’s previous systems were large blow-pot types which suffered from bridging as well.

Download Case Study: Ground Rice Hull Ash (pdf)


  • Material: Ground Rice Hull Ash
  • Bulk Density: Average 300 kg/m3 (19 lb/ft3)
  • Size: 100% < 500µ, 80% < 200µ, 50% < 100µ
  • Temperature: Dust Collector Ash: 200°C (390°F), ESP Ash: 200°C (390°F), Bottom Ash: 350°C (660°F)
  • Moisture: 0%
  • Condition: Free flowing when aerated, highly abrasive


  1. Elimination of dusty conditions and pipe blockages.
  2. Reduce air consumption from existing systems.
  3. Reduce pipe and valve wear.
  4. Operate with 1 psig vacuum in baghouse.
  5. Prove concept at 20MW plant.


  • Transfer Capacity: 13.2Mt/h (14.5t/h) total, all systems
  • Conveying Distance: Average 70m (230ft)
  • Reception Points: One per system


1. System operation is stable, reliable and efficient
2. Purchased directly through end user, using local contacts; dealing with local culture
3. Systems consume 1/3 the air of their previous systems equating to valuable efficiency gains
4. Customer is using plant as a proving ground for follow up projects elsewhere in Asia