home  /  technology  /  the crg process

The CRG process


The Cold Recycle Granulation (CRG) process is modernizing the urea granulation world. This is state of the art Granulation Technology, where energy saving, low investment costs and high product quality are combined in a ground shaking new layout and a revolutionary production process.

The CRG process is the result of Green Granulation’s extensive R&D efforts in a quest to optimize solid product flows. CRG combines the improved internal circulation within the spray zone from the Optimized Fluidized Bed Dynamics (OFBD) principles with a boost in cooling capacity.

The CRG process consists of a fluidized bed granulator containing the hydraulic urea sprayers but no cooling section. The granulator is operating at reduced product layer thickness thanks to the patented sprayer layout. Urea plus biuret content of the urea melt to the sprayers is typically 96% but 95% is no problem.

In line with the granulator comes the fluidized bed cooler operating at identical product layer thickness as the granulator.

Optional cooling options include air sieve and cooling plates (please refer to the Alternative cooling options section on the process characteristics page).

Oversize and remaining fines are screened out at end product temperature. The cold crushed oversize and cold fines are recycled to the granulator together with the hot fines from the air sieve.

Granulator air and cooler air is cleaned in separate low pressure drop wet scrubbers. Dust in the stack is only 30 mg/Nm3 thanks to the patented double temperature scrubbing of the granulator air.

You can find more information on the process on the dedicated process characteristics page. If you want to learn more about Green Granulation’s OFBD and CRG processes or other fertilizer technology we offer, you can contact Green Granulation by phone or email.


To top