Method and apparatus for regulating the sand discharge during th

Details Method and apparatus for regulating the sand discharge during th Method and apparatus for regulating the sand discharge during th

1993-05-12

1995-04-11

Bennet, Henry A.

Drying and gas or vapor contact with solids

Process

With fluid current conveying or suspension of treated material

34580, F26B 308

Patent

active

054046556

ABSTRACT:
The invention relates to a method for regulating the sand discharge by means of a discharge pipe located on the opposite side of a sand charging means of a fluidized bed kiln in connection with the thermal regeneration of old foundry sand, in which the base of the fluidized bed kiln has openings through which the hot gases pass into the fluidized bed. The method is characterized in that the sand exit from the discharge pipe (4) is freed by increasing the air supply in a pneumatic conveyor (5) following the fluidized bed kiln (1) through its perforated base (7) in such a way that the pouring cone (6) formed between the end of the discharge pipe (4) and the base (7) is decreased and consequently the exit of the discharge pipe (4) is freed.

REFERENCES:
patent: 4821654 (1989-04-01), Becker et al.
patent: 5090134 (1992-02-01), Russemeyer et al.

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