Abstract: A process for the granulation of urea with a scrubbing system includes several waste streams for removal of dust and ammonia from the off-gas of a urea granulation unit. A urea granulator, a granulator scrubber dust stage, a granulator scrubber acid stage, product coolers, a product cooler scrubber dust stage, an evaporation unit, and a condenser unit are included in the system. A first stream of fresh air is sent into the urea granulator, whereby dust- and ammonia-laden air is drawn off from the granulator and conveyed into a granulator scrubber dust stage, followed by a granulator scrubber acid stage and ammonia is scrubbed from that air by the generation of an ammonium salt. A second stream of fresh air is used for cooling the product drawn off from the urea granulator in product coolers. The cooling air is thus heated up and conveyed to a product cooler scrubber dust stage.
Type:
Application
Filed:
November 6, 2009
Publication date:
September 22, 2011
Applicant:
UHDE FERTILIZER TECHOLOGY B.V.
Inventors:
Paul Niehues, Harald Franzrahe, Matthias Potthoff, Roland Monstrey