초록 ▼

The process for low-emission drying of a substance in a drum-type drying installation is suitable in particular for sewage sludge, fish meal and sludges from starch factories, soap factories and paper mills, which substances are preferably to be converted into granules. The process is likewise very

The process for low-emission drying of a substance in a drum-type drying installation is suitable in particular for sewage sludge, fish meal and sludges from starch factories, soap factories and paper mills, which substances are preferably to be converted into granules. The process is likewise very suitable for drying biomass products such as wood chips, grass, sugar beet chips and the like, since the emissions are very greatly reduced by means of this process. The drying process is carried out in such a way that no unpleasant odors and dusts are emitted to the outside, because the actual drying circulation is closed. Fossil fuels are used as the heat source for the burner for heating this air stream.

대표청구항 ▼

A process for the low emission drying of a substance in a closed loop drum dryer installation, said process comprising the steps of: (a) maintaining the pressure of an air and vapor mixture within the closed loop drum dryer installation below external atmospheric pressure such that no emission of ga

A process for the low emission drying of a substance in a closed loop drum dryer installation, said process comprising the steps of: (a) maintaining the pressure of an air and vapor mixture within the closed loop drum dryer installation below external atmospheric pressure such that no emission of gaseous odor and dust can escape from the installation to the external atmosphere during the drying process; (b) continuously purging water evaporated during drying, filter flushing air, and leakage air from the closed loop drum drying installation; (c) condensing water vapor contained within the air and vapor mixture in a downstream condenser and then feeding the uncondensable gases to a combustion chamber for generating heat energy for use during the drying cycle; (d) maintaining a temperature in the combustion chamber to ensure complete combustion of all odorous substances; and (e) discharging purged air and flue gases from the combustion chamber essentially free from odor and dust, and without a visible vapor plume.