Apparatus for generating a high velocity hot gaseous blast

Claim 1

BURNER APPARATUS, COMPRISING IN COMBINATION: (A) A REFRACTORY WALL DEFINING A COMBUSTION CHAMBER, (B) SAID COMBUSTION CHAMBER HAVING AN INLET AND A RESTRICTED OUTLET; (C) A PLENUM COMBUSTIBLE FUEL CHAMBER ADJACENT SAID INLET; (D) A METALLIC WALL DISPOSED BETWEEN SAID COMBUSTION CHAMBER AND SAID FUEL CHAMBER, (E) SAID METALLIC WALL DEFINING A SUBSTANTIALLY ANNULAR PORT, (F) THE PORTION OF SAID COMBUSTION CHAMBER IMMEDIATELY ADJACENT TO SAID METALLIC WALL BEING CYLINDRICAL IN CROSS-SECTION AND HAVING A DIAMETER GREATER THAN SAID ANNULAR PORT AND DEFINING AN ARRANGEMENT WHEREIN THE REFRACTORY OF THE CYLINDRICAL PORTION IS SPACED LATERALLY FROM SAID PORT AND THE AXIS OF SAID CYLINDRICAL PORTION IS SUBSTANTIALLY PERPENDICULAR TO SAID METALLIC WALL, AND (G) SAID PORT EXTENDING OUTWARDLY THROUGH SAID METALLIC WALL AT AN ANGLE TOWARD SAID REFRACTORY WALL TO DIRECT THE FUEL INTO INITIAL CONTACT WITH SAID REFRACTORY WALL AT AN ACUTE ANGLE THEREWITH.