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[[File:Superheated Steam Drying.jpg|thumb|200px|right|Superheated Steam Drying]] | |||
'''Superheated Steam Drying''' is an environmental and energy saving drying technology | |||
===Superheated steam drying process=== | |||
Closed loop system | |||
The Superheated dryer is a closed loop pneumatic conveying type. The wet solids are fed into the flow of pressurised superheated transport steam by means of a pressure tight rotary valve, plug screw or similar. | |||
Indirect heating | |||
The transport steam is superheated indirectly via a tubular heat exchanger, by a heating media such as medium pressure steam, flue gases or thermal oil. Also, electrical heating can be applied. | |||
Fast drying | |||
In the subsequent drying ducts, moisture is vapourized from the product, forming excess transport steam and lowering its degree of superheat. Normally the residence time in the system is 5-60 seconds only. For some materials a second superheater is necessary to achieve the required dryness. | |||
Energy recovery | |||
Primary consumption is about 750 kWh/ton evaporated water without any heat recovery. 70-90% of the energy is recoverable by re-using generated steam in another process, for heating purposes, or by using Mechanical Vapour Recompression. With a condensing turbine the generated steam can produce about 200 kWh electricity per ton evaporated water. | |||