System for the drying of damp biomass based fuel

F - Mech Eng,Light,Heat,Weapons – 23 – G

Patent

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F23G 5/04 (2006.01)

Patent

CA 2371196

System for drying a damp biofuel, said system comprising a boiler (1), preferably a fluidized bed boiler, for combustion of the fuel. Further, the system comprises a first heat drying chamber (2), a drying gas flow (3) heated by the thermal energy of the combustion gases from the boiler and/or by steam, said gas flow being passed into the first heat drying chamber, and a fuel supply (4) for passing the fuel into the first heat drying chamber. According to the invention, the system comprises a second heat drying chamber (5), an intermediate heating unit (6) for heating the drying gas flow before the second heat drying chamber, an intermediate supply (7) for passing the fuel from the first heat drying chamber into the second heat drying chamber, a boiler supply (8) for passing the fuel from the final heat drying chamber into the boiler and an outlet (9) for passing the flow of drying gas from the final heat drying chamber into the boiler.

La présente invention concerne un système destiné au séchage d'un biocombustible humide, ledit système comprenant une chaudière (1), de préférence une chaudière à lits fluidisés, servant à la combustion du combustible. Le système comprend également un premier compartiment de séchage à la chaleur (2), un flux gazeux de séchage (3) chauffé par l'énergie thermique des gaz de combustion provenant de la chaudière et/ou par la vapeur, ledit flux gazeux passant à l'intérieur dudit premier compartiment de séchage à la chaleur, ainsi qu'une alimentation en combustible (4) destinée à faire passer le combustible à l'intérieur du premier compartiment de séchage à la chaleur. Selon l'invention, le système comprend un second compartiment de séchage à la chaleur (5), une unité de chauffage intermédiaire (6) destinée à chauffer le flux gazeux de séchage avant le second compartiment de séchage à la chaleur, une alimentation intermédiaire (7) destinée à faire passer le combustible du premier compartiment de séchage à la chaleur au second compartiment de séchage à la chaleur, une alimentation de chaudière (8) destinée à faire passer le combustible du dernier compartiment de séchage à la chaleur à la chaudière, et une sortie (9) destinée à faire passer le flux gazeux de séchage du dernier compartiment de séchage à la chaleur à la chaudière.

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