Sprinkler for granulator tower ensuring particle uniformity - has chamber with perforated bottom divided into separately closable compartments

A sprinkler for a granulator tower through which molten material can be sprayed has a chamber with a perforated bottom to which the feed line for the molten material to be granulated is joined. The chamber is partitioned into independent compartments, each of which is delimited by a section of the perforated bottom, and each of which is connected by a feed pipe which can be closed to the main feed line for the molten material. The distributor feed lines may be connected to the main feed line by a pressure chamber with a double wall and a circulating system. These feed pipes have vertical sections extending into the pressure chamber with their inlets at different heights and fitted with float controlled valves. The specific loading of the perforated bottom can be fully controlled so that a product with a uniform granular size can be obtd. Compartments can be closed so as to control the loading on the perforated bottom and maintain the pressure on the material stream through the perforations at a constant value, despite variation in delivery speed of material. L'invention concerne la fabrication des matières granulées. Le dispositif de pulvérisation comporte une chambre 13 ayant un fond perforé 14 divisée en sections distinctes 16, 17, 18 dans lesquelles la matière fondue arrive par des tubes d'alimentation individuels 19, 20, 21 fermés par des soupapes à flotteur 25, 26, 27. En faisant varier le nombre de sections en service 16, 17, 18 on maintient constant la pression des jets sortant des orifices du fond perforé 14 lors de variation de l'alimentation en matière fondue. Une installation comporte plusieurs dispositifs qui communiquent avec des vases de pression 15 reliés à un réservoir de pression commun 37 par des tubulures 38, 39, 40 dont les extrémités supérieures à des hauteurs différentes sont fermées par des flotteurs 44, 45, 46, ce qui permet de mettre en fonctionnement ou hors service les chambres 13.