Device for extracting particulate materials of a fluidized bed from the fluidization enclosure

A device for extracting particulate material from a fluidized bed thereof contained in a fluidization enclosure the device comprises:

• a fluidization enclosure containing an enclosure opening provided through a side wall of the fluidization enclosure, said enclosure opening communicating with a tube such that the tube extends outside the fluidization enclosure, said tube being further constructed so as to extend perpendicularly to the side wall;
• a duct having a duct opening connected substantially perpendicularly to said tube and extending downwards;
• a piston slidably mounted in sealed manner inside the tube, said tube being constructed so as to allow the piston to slide between a first position and a second position, wherein said piston is constructed so as to shut the enclosure opening when in said first position and further constructed so as to at least partially uncover said enclosure opening of said duct when at the second position so as to provide flow communication between said opening of said enclosure and said duct opening of said duct;
• and
• control means for displacing the piston inside the tube between said first position and said second position.