DRIENG SYSTEM WITH CIRCULATING GAS
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Abstract
This drying system dries material with circulating gas or steam of any type. Air is used as the name for the gas. A drying cycle consists of the following basic phases: •Charging of drying material •Heating with circulating air without discharge of air until the air before the air heater has reached desired relative humidity and temperature •Discharge of warm humid air with continued heating of circulating air and intake of outside air or returned dehumidified air. The discharged flow is so controlled that the in the dryer circulating air keeps its desired relative humidity and temperature. •Discharge of the dried material and at the same time cleaning of all the components whose function can be disturbed by dust. •Charging of new material to be dried.
34 Citations
15 Claims
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1-8. -8. (canceled)
- 9. Method for drying material characterized by that heated gas or steam heated in a gas heater is led through the material to be dried in a closed vessel, is heated again in the gas heater and leads through the material so many times that the before specified relative humidity and temperature are reached before the gas heater after which part of the gas before the gas heater is directed to a cooling device for dehumidification and heat recovery to the cooling medium, after which the cold and dehumidified gas from the cooling device is directed to the inlet of the gas heater, the flow of the gas directed to the cooling device is so controlled that the relative humidity and temperature of the in the drier circulating gas is kept as desired why no emissions are slept out into the atmosphere.
Specification