HOOD OF OPEN ORE-THERMAL FURNACE Russian patent published in 2015 - IPC F27B3/10 F27B1/18 F27D17/00 

FIELD: metallurgy.

SUBSTANCE: hood consists of a cover plate, walls of the housing of a smaller diameter and a movable screen of a larger diameter, which are made in the form of a cylinder. On the cover plate there are holes for current leads and charging pipes. In side walls of the hood housing there installed are intake openings of gas ducts, which are located tangentially, and branch pipes for supply of taphole gases. A movable screen is installed with shutoff of a gap between a flange of the furnace and the walls of the hood housing. The intake openings of gas ducts have a rectangular cross section with ratio of sides of 1:2÷1:5, are located tangentially and turned relative to each other through 180° or 120°.

EFFECT: invention allows providing effective gas removal, reducing volume of a gas vent by two times, preventing emissions of gases from under the hood to the shop, due to reduction of working negative pressure, reducing operating energy costs, reducing the velocity of bled gas flow in gas ducts and abrasive loads on structural elements of gas cleaning equipment.

5 cl, 4 dwg