F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
34/46
F26B 21/02 (2006.01) F26B 17/10 (2006.01) F26B 23/02 (2006.01)
Patent
CA 1063344
A B S T R A c T In a pneumatic dryer, a material which gives off an odorous exhaust during drying is dried in a first dryer section by a stream of hot gas, the major part of the spent gas stream being re-heated by the addition of air and burning fuel under pressure to form the said stream of hot gas The excess spent gas in the first dryer section is passed through an incinerator to pyrolyse the odorous content of the spent gas stream, and the pyrolysed gases are used to dry a second wet material in a second dryer section and are then passed to atmosphere. The second wet material does not give off an odorous exhaust. In a modified method a wet material which gives off an odorous exhaust when the moisture content of the material falls below a critical value during drying is dried in the second dryer section to a moisture content having a value above the critical value and is then dried to completion in the first dryer section The heat added to incinerate the said excess spent gas from the first dryer section should be slightly in excess of what is necessary for the pyrolysation of the odorous matter therein, and all the available heat in the hot gas stream from the incinerator should be usefully employed in drying the wet material in the second dryer section.
265815
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