Vimasol 2011 (EC - Biomass Dryers)

Hurricane system to capture particles from a sawdust dryer operating in a wood pellet plant, with a flow (8,074m3/h at 110 ºC.)

  • The system is composed by 4 hurricane cyclones with ø750mm 
  • It will be upgraded with 1 ReCyclone MH® with ø1,300mm to comply with 50mg/Nm3.
  • Expected emissions: < 150 mg/Nm3
  • Measured emissions: < 108 mg/Nm3
Garbuio Dickinson (EC _ Biomass Dryers)

Hurricane system to reduce tobacco particle load from a drying line with a 4720m3/h gas flow rate at 180ºC.

  • The system is composed by 2 hurricane cyclones with ø600mm
  • Efficiency is expected to reach 96.1-97.8% with a pressure drop of 1.7 kPa.
  • Expected emissions: <100mg/Nm3
Garbuio Dickinson
L Sole 2013 Dominicana (EC- Biomass and Coal Combustion)

Electrostatic ReCyclone® EH system  for PM emission control in a 25,306m3/h at 250ºC wood pellet grate type boiler.

  • The system is composed by 12 hurricane cyclones with ø800mm and 12 electrostatic recirculators of ø800mm.
  • Installed in tail-end position to meet the legal emissions limit of 50mg/Nm3 at 11% O2
  • Expected pressure drop: 1.5kPa
  • Expected emissions: < 30mg/Nm3 at 11% O2
L. Solé
Dominican Republic
HR Glowood
Hurricane HR cyclones to reduce emissions of dryer cyclones at GLOWOOD pellet plant (71 839 m3/h at 87ºC)
  • Inlet Concentration (mg/Nm3dry) [702]
  • Expected Emissions (mg/Nm3 dry) [58]
Hurricane HR cyclones to reduce emissions from wet woodchips grinding at Verdo Renewables
Hurricane HR Cyclones to reduce emissions from wet woodchips grinding at Verdo Renewables Ltd. (8 000 m3/h at 20ºC)
Expected emissions (mg/Nm3dry) [15]
Expected total pressure drop (Kpa) [1.2]
Verdo Renewables Ltd
Andover, UK
Numerically optimized cyclones, considering particle agglomeration

Hurricane geometries maximize powder collection for each different application, while minimizing reentrainment and keeping pressure drop at reasonable levels.

These high efficiency cyclones are the output of nonconvex nonlinear problems formulated and solved after years of work in partnership with the Faculty of Engineering of Porto.

A single Hurricane is more efficient than any other known cyclone available in the market for the same pressure drop, usually resulting in less than half of the emissions of other high efficiency cyclones available.

  • Very low emissions, ranging from [26-105mg]/Nm3 depending on the boiler, fuel and Hurricane line of cyclones used. 
  • Custom designs (single or parallel arrangement)
  • Low pressure drop: [100 - 150] mm w. g.
  • No temperature restrictions
  • Robust construction with no moving parts
  • Near zero maintenance and downtime costs
  • Very low operating costs
  • Pre-assembled modular system with very easy and fast installation. Batteries of 2, 4, 6 or 8 cyclones are shipped pre-assembled in a supporting structure with or without thermal insulation.
  • Low investment cost

1. Air with fly ash from the dryer
2. Hurricane Cyclones. (Batteries of 2, 4, 6 or 8 units )
3. Rotary discharge valve
4. Dust receiver with collected particles
5. Clean air

Note: supporting structure, insulation and ductwork are not represented
Biomass Milling & Drying
Pellets are typically manufactured from wood chips and sawdust. The wet raw material in usually grinded in a hammer mill and then dried in a rotary dryer heated by a biomass furnace. The material is then collected in dryer cyclones to be pelletized.

The air conveying the wet grinded material is cleaned with a particulate filter before going to the atmosphere. A common type of filter used for this application is the cyclo-filter, which combines the operating principles of cyclones with a cartridge filter on top to prevent the fines from escaping. However, since these cartridges clog very often (due to the high moisture content of the product), some plants remove it to be able to operate. Despite solving the operational issue, this leads to a secondary problem: an emission increase. The total concentration escaping the cyclo-filters without the cartridge is between 400 to 600 mg/Nm3.

After the dryer the dryed material is carried over to the dryer cyclones. In addition to the wood particles a much smaller amount of fine ash from the biomass combustion is released and captured in the cyclones. The total concentration of wood dust and ash entering the cyclones is typically 200 000 to 300 000 mg/Nm3.

Usual cyclone dryers are capable of capturing the particles to a quite high degree (>99%), but often still have emissions of 200-350 mg/Nm3.

These levels of concentration of particles at the cyclone filter exit and at the dryer cyclones outlet are too high for most countries regulatory emission limits and therefore the plants have to be equipped with an end stage deduster to bring emissions under 50 mg/Nm3 (or lower)
Biomass Milling & Drying
Biomass Milling & Drying
Biomass Milling & Drying
Biomass Milling & Drying
Biomass Dryers | General Arrangement

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