| 摘要 |
Apparatus for controlling the moisture content of prilled products, which are produced by air drying a spray of the liquid product, comprises a vessel (10) for receiving a flow of air and a flow of the liquid product, a supply line (14) for supplying air to the vessel and a supply line (16) for supplying liquid product to the vessel. The product is advantageously a solution of urea. Moisture content is measured or inferred for the product flow, the input air and the air coming out of the vessel. An air flow controller (FIC-11) is connected for controlling the flow of air into the vessel, which controller is itself controlled by a circuit that calculates a desired air input flow rate for a selected moisture concentration in the prilled urea product. |
