"2+1"管反工艺在磷铵转鼓造粒中的研究及运用OA

The 600000 t/a plant of Phase Ⅱ of Sanhuan Zhonghua ammonium phosphate adopts a dual tube reverse PR process for granulation,adding a set of PR tube reverse process control flow and pipe fittings on the original dual tube process,and introducing FCS operation for feeding operation according to the original tube reverse operation mode;The pipe counter nozzle adopts a spiral nozzle,with a spray fan angle of ≤ 60°,to produce high solid content products(such as 64％DAP+60％DAP,64％DAP+57％DAP,64％DAP+53％DAP)through spray gran-ulation.The slag acid bypasses the washing system and directly enters the newly added tubular reactor;mixing and coating granulation inside the granulator,using fillers instead of sulfuric acid to adjust the nitrogen content and excess nutrients in the product.Through research and ap-plication,on the one hand,the pressure of slag acid inventory can be alleviated,on the other hand,the production cost of 64％DAP can be appropriately reduced,and on the other hand,the granulation conditions can be improved.