COMBUSTION FURNACE

摘要

PROBLEM TO BE SOLVED: To prevent deposition of soot and the like on a transparent window member by suppressing access of combustion gas to an interior observation window. SOLUTION: A combustion furnace having the interior observation window A with the transparent window member 2 fitted in one end face of a hollow frame 1 has a plurality of gas jet nozzles 3A to 3D for jetting gas into the hollow frame 1 from the outside. The gas jet nozzles 3A to 3D are each set in the attitude where the jet direction crosses others on the centerline L of the hollow frame 1. The interior observation window A is arranged on the combustion furnace via a restricted portion B. COPYRIGHT: (C)2004,JPO