Gas-feed nozzle for a pyrolytic particle coating apparatus

Details Gas-feed nozzle for a pyrolytic particle coating apparatus Gas-feed nozzle for a pyrolytic particle coating apparatus

1982-06-04

1983-10-04

Smith, John D.

Coating apparatus

Gas or vapor deposition

Means to coat or impregnate particulate matter

118303, 118DIG5, 427 6, 427213, B05B 134, C23C 1100

Patent

active

044072309

ABSTRACT:
For certain related dimensions of features of a nozzle feeding a fluidized bed reactor from below, it has been found that a central flow of a coating gas is squeezed down in diameter in passing through a constriction at the nozzle end by the action of the surrounding dilution gas flow, without the setting up of turbulence such as might have been expected, which would cause deposits from the decomposition of the coating gas at the constriction. The spacing between the mouth of the central tube that feeds the coating gas and the constriction at the end of the nozzle should be in the range of 20 to 70 mm, the diameter of the constriction aperture should be in the range from 3 to 10 mm and the diameter of the central channel should be greater than the constriction aperture diameter but not more than 3.5 times the latter diameter. For coating particles having a density of about 10 g/m.sup.3 and a diameter of about 200 .mu.m , the constriction aperture diameter should not exceed 7 mm.

REFERENCES:
patent: 1503817 (1924-08-01), Compere
patent: 2218880 (1940-10-01), Hanson
patent: 3443621 (1969-05-01), Dubrevil
patent: 4153004 (1979-05-01), Barnert
patent: 4259925 (1981-04-01), Barnert et al.

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