| 摘要 |
PURPOSE: To provide a process capable of recycling operation of a gas without drying the gas. CONSTITUTION: The process comprises a step of spray-drying a composition selected from the group consisting of an alkali sulfide solution, alkali sulfide suspension, alkali sulfide dispersion and alkali sulfide water of crystallization melt by using inert drying gas loaded with water vapour. The device comprises a drying chamber, an atomizing device introduced into the chamber for conveying a dryer feed, a feed device for supplying drying gas to the chamber, a discharge outlet for the exhaust of gas stream from the chamber, a solids separation system connected to the chamber by the discharge outlet and having an exhaust air pipe optionally equipped with a filter unit to remove the gas stream, a plant for recovering solvent from the exhaust gas stream and a recycling and conditioning apparatus for at least partially recycling and conditioning of the exhaust gas for renewed use as the drying gas.
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