Spray system, hydraulic sulfur

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. 

Pneumatic Sulfur-Spraying System. Sulfur-Coated Urea with Sealant. Figure 3 is a flow diagram of the pneumatic sulfur-spraying system. This system provides better atomization than the hydraulic system, which is discussed later. With the pneumatic system less sulfur is required, producing a higher analysis sulfur-coated urea fertilizer. 

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.

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