Heating – Having fluid curtain at chamber port or work path
Patent
1992-11-06
1994-08-09
Joyce, Harold
Heating
Having fluid curtain at chamber port or work path
432249, 454190, F27D 706
Patent
active
053360850
ABSTRACT:
An apparatus and method for providing a selected atmosphere at and within an opening to the interior volume of a furnace. Two or more paralleled diffusers adjacent to the furnace opening laminarly emit different fluids and provide a multilayer fluid curtain over the opening. The curtain has a composite modified Froude number from 0.05 to 10, and a thickness at emission of at least 5% of its extent in the flow direction. Partially covering the outside of the curtain is an optional, substantially flat, outer shield with an aperture coinciding with the furnace opening, which reduces the necessary flow rates of fluids. Optional side shields around the sides of the curtain also reduce the necessary fluid flow. A preferred diffuser comprises a porous tube in a housing with an outlet directed to emit fluid across the furnace opening. The outlet is covered with a screen to disperse the fluid flow and to protect the porous tube.
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A. A. Townsend, Section 10, "Turbulence", Handbook of Fluid Dynamics, 1961, pp. 10-30 and 10-31.
Barlow Alan R.
Nowotarski Mark S.
Riley Michael F.
Sharma Sudhir K.
Joyce Harold
O'Brien Cornelius F.
Praxair Technology Inc.
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