Method of high intensity steam cooling of air-cooled flame spray

Details Method of high intensity steam cooling of air-cooled flame spray Method of high intensity steam cooling of air-cooled flame spray

1992-12-17

1994-12-13

Beck, Shrive

Coating processes

Spray coating utilizing flame or plasma heat

239 79, 239 83, 427449, B05D 108

Patent

active

053728572

ABSTRACT:
A flame spray device of the internal burner type has a fuel and oxidizer mixture combusted within a combustion chamber feeding products of combustion to a discharge nozzle passage of reduced inner diameter. An axially aligned metal piece injector has a centrally disposed injection bore hole positioned upstream of the combustion chamber and is provided with particles which are fed through the centrally disposed injection bore hole with the injection bore hole opening near the entrance of the nozzle passage. The metal piece terminates in a cone-shaped section with a reduced diameter end proximate to the entrance to the nozzle passage. A knife-edge terminal face is thereby produced intersecting the injector bore hole to minimize turbulence and rotation of the stream of carrier gas containing the powder exiting the injector metal piece injection hole. An annular jet stream surrounding the gaseous jet stream is wholly or partially formed of super-heated steam such that the steam, resulting from vaporization of water droplets, acts to cool the structural components of the internal burner. The device may alternatively be constituted by a plasma torch device.

REFERENCES:
patent: 3880354 (1975-04-01), Van Horn
patent: 4235943 (1980-11-01), McComas et al.
patent: 4369919 (1983-01-01), Bebev et al.
patent: 4634611 (1987-01-01), Browning
patent: 5135166 (1992-08-01), Dietiker et al.

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