In order to obtain higher efficiencies and compliance with emission limits, an improved recirculation system has been designed to take advantage of the Hurricane cyclones.


A mechanical ReCyclone® (ReCyclone® MH) is made up of a Hurricane and a particle separator (straight-through cyclone), placed downstream of the cyclone - called the "recirculator".


The main purpose of the recirculator is to reintroduce the fine uncaptured particles into the cyclone after they have been driven to the outer walls of the recirculator by centrifugal forces.


While this tangential gas stream is enriched with particles, the axial gas stream exhausting to the stack is cleaned of particles. Recirculation is achieved through an additional fan.

Since the recirculation system only serves the purpose of dust separation (and not of collection), the particles are exclusively collected in the cyclone and the need of rapping mechanisms is thus avoided.


Efficiency Increase


Efficiency increases due to recirculation and agglomeration of very small particles with larger ones coming directly from the process. A ReCyclone® MH decreases emissions of Hurricane cyclones alone by 40 to 60 %. As with cyclone systems, ReCyclone® MH systems are very robust, do not have temperature limitations and do not have moving parts to be frequently changed.

Finally, recirculation control provides the benefit of handling variable process flow rates very well.


A ReCyclone® MH is the most efficient purely mechanical collector in the market.

MH (Boimass Boiler) Sonae Industria
ReCyclone MH System for PM Emission Control on biomass boilers flue gases at Sonae Indústria (92 132 m3/h at 230°C)
  • Fuel [Wood chips and waste]
  • Emissions after boiler (mg/Nm3) [385]
  • Expected emissions at 11% O2 (mg/Nm3) [29]
Sonae Novobord
South Africa
2010
MH (Fluid bed dryers)
ReCyclone MH System to recover the fine fraction of sulphanilic acid in a leading chemicals company in Portugal (14 000 m3/h at 70ºC)
  • Inlet concentration (mg/m3) [144 000]
  • Predicted efficiency (%) [>99.60%]
Confidential
Portugal
-
ReCyclone MH ( Basuki )
Recyclone MH system to reduce particulate matter from a coal or palm shell BFB boiler flue for Basuki ( 6 972m3/h at 230ºC )
  • Inlet Concentration (mg/Nm3) [5600]
  • Emissions below (mg/Nm3)  [150]
Basuki
Nusa Dua
2012
ReCyclone MH System to Reduce Particulate Matter from a biomass boiler burning a mixture of mesocarp fibre and palm kernel shell
Recyclone MH to Reduce Particulate Matter from a biomass boiler burning a mixture of mesocarp fibre and palm kernel shell ( 137 620 m3/h at 320ºC )

Guaranteed emissions 12% CO2 (mg/Nm3), after the system [<150]
Expected emissions 12% CO2 (mg/Nm3), after the system [ <100]
Expected total pressure drop (KPa) [<1.25]

Tradewinds
Bintulu, Malaysia
2016
ReCyclone MH
ReCyclone MH
Fertilizers
ReCyclone MH
ReCyclone MH
Biomass and Coal Combustion
ReCyclone MH
ReCyclone MH
Biomass and Coal Combustion
ReCyclone MH
ReCyclone MH
Biomass and Coal Combustion
ReCyclone MH
ReCyclone MH
Fertilizers