| 摘要 |
A method for producing urea granules having low moisture absorption capacity, with a urea granulator, having a granule flow inlet side and oppositely a granule flow outlet side, forming an axis alongside which urea granules from a urea solution and a urea / ammonium salt-stream are formed, whereby the urea solution and the urea / ammonium salt-stream are sprayed as a mixture or separately via a feed system unit via various nozzles into the urea granulator onto a seed material. In this process the highest amount of the urea / ammonium salt-stream is sprayed into the urea granulator at the granule flow inlet side and the amount of the urea / ammonium salt-stream is decreased alongside the axis of the urea granulator from the granule flow inlet side to the granule flow outlet side, whereby the urea / ammonia salt-stream comprises a urea : ammonium salt ratio between 4 and 20, a water content of 0 - 10 % by weight and optionally up to 1 - 5 % by weight additives, and the highest amount of the urea solution is sprayed into the urea granulator at the granule flow outlet side and the amount of the urea solution is decreased alongside the axis of the urea granulator from the granule flow outlet side to the granule flow inlet side. |
