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Process characteristics

Characteristics and advantages of the Optimized Fluidized Bed Dynamics and CRG processes

Low energy consumption thanks to:

  • Reduced product layer thickness resulting in less heating of the fluidization air fan and consequently reduced amount of needed air
  • Hydraulic urea sprayers use reduced amount of atomization air at reduced pressure
  • Low pressure drop scrubbers reduce the power consumption of the exhaust air fan(s)
  • Reduced amount of recovered urea dust combined with lower water content of the urea solution, typically 55% due to low atomization air and higher granulator scrubber temperature

Low investment thanks to:

  • low building height, typically 27m total height
  • low requested building strength, highest load bearing floor is at the granulator bottom at 17m, vibrating screens are located below the granulator
  • reduced granulator and cooler strength because of low fluidization air fan pressure and low scrubber exhaust fan suction pressure
  • bucket elevator capacity is only 30% of standard, lifts only fines and crushed product
  • reduced air ducting, air enters the scrubbers from the top and leaves the scrubbers from the side

Improved product quality thanks to:

  • low product moisture due to the combination of the Green Granulation hydraulic sprayers and Optimized Fluidized Bed Dynamics sprayer layout
  • low end product dustiness due to slow cooling and highly improved product polishing in the cooler

Alternative cooling options

Cooling plates


Specially designed to maximize the heat transmission between warm granules and cold cooling water and to minimize the risk of urea deposition on the cooling plates


  • Boosting the cooling capacity of the cooler
  • Optional for grass root plants or as revamp tool

Air Sieve Technology


Removing a large stream of under-size product from the cooler at a stage where this product is not yet cooled down to end temperature. This stream is re-injected in the granulator as warm seed material.


  • Boosting the cooling capacity of the cooler
  • Optional for grass root plants or as revamp tool
  • Lowering the load to the vibrating screen(s)

Scrubbing Technology

As part of a complete granulation unit project or as a separate service


  • Horizontal type scrubbers
  • Low pressure drop
  • Special designed scrubber pads that are able to handle huge quantities of scrubbing solution per m2
  • Optional Ammonia abatement stage
  • Patented double temperature scrubbing technology

If you want to learn more about Green Granulation’s OFBD and CRG processes or other fertilizer technology we offer, please contact Green Granulation by phone or email.


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