Hydraulic sulfur spraying system

Figure 1. Flowsheet of process for coating urea with sulfur and a wax sealant using either pneumatic or hydraulic sulfur-spraying system...

The process and the related variables depend on whether the plant is producing sulfur-coated urea with or without a sealant and whether the sulfur is being applied with the pneumatic or hydraulic sulfur-spraying system. 

Hydraulic Sulfur-Spraying System. Sulfur-Coated Urea with Sealant. Figure 9 is a flow diagram of the hydraulic spraying system used in the 1 ton/hr sulfur-coated urea pilot plant. Since nozzle openings are smaller (0.007-0.015 in.) than the orifices used in the pneumatic system, sulfur filtration in this system is even more important. 

Figure 5. Sulfur-coated urea quality using optimum production rates and operating conditions for pneumatic and hydraulic spraying systems...

Figure 9. Flow diagram of system for supplying sulfur to hydraulic spray nozzles. All sulfur lines are steam jacketed or submerged in molten sulfur.

---