With Plural Treating Zones Or Compartments Patents (Class 34/589)
Serpentine path for material (Class 34/590)
  • Method for circulating solid material in a fluidized bed reactor
    Patent number: 5332553
    Abstract: In a fluidized bed reactor particles are internally circulated, moving down the walls forming the reactor chamber. A particle chamber having a particle gathering top wall with a horizontal projection area A is disposed in the downward flow of particles. Openings (e.g. holes or slots) with a controlling dimension of about 30 mm or less are provided in the top wall, the openings having total open area B less than half the area A. Heat transfer surfaces may be disposed in the particle chamber.
    Type: Grant
    Filed: April 5, 1993
    Date of Patent: July 26, 1994
    Assignee: A. Ahlstrom Corporation
    Inventor: Timo Hyppanen
  • Process and apparatus for drying and calcining sodium bicarbonate
    Patent number: 5325606
    Abstract: Damp sodium bicarbonate filter cake is pre-dried and calcined to produce light soda as in a process comprising a carbon dioxide ebullated fluid bed pre-dryer working in connected series relationship with a plurality of carbon dioxide ebullated fluid bed/bag filter calcination systems such that bicarbonate decomposition during pre-drying is minimized and the thermal treatment of small particles during calcination is optimized.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: July 5, 1994
    Assignee: Niro A/S
    Inventor: Erik Liborius