| 摘要 |
<p>A process for preparation of a granular urea product by granulating a urea solution in a fluidized bed, where the granulation process takes place along a substantially longitudinal growth path, from a granulation starting end (1 S ) to a product discharge end (1 E ) of said fluidized bed, and said urea solution enters the fluidized bed by means of several urea inputs (2 A , 2 B , 2 C ) taken from a main urea feed (2), where an additive (6) is mixed with said urea solution said additive has a non-uniform concentration in said urea inputs, so that at least two of said urea inputs have a different concentration of additive.</p> |
