Patent ID: 6027339
Filing Date: 2000-02-22
Classification: F27B

Abstract:
Ring furnace (1) with open type sections (2) for baking carbonaceous blocks (40) in a rotating fire comprising, along the longitudinal X direction of the furnace, a series of sections (2) separated by headwall, (32) provided with openings (320), each section comprising, along the transverse Y direction of the furnace, hollow walls (3) through which a heating gas flow (35) comprising combustion gas or a cooling air flow (34) circulates, alternating with pits (4) containing carbonaceous blocks (40) to be baked, each of the said hollow walls (3) in a section (2) being in communication with a wall in an upstream section and/or a wall in a downstream section, so as to form a conduit (5) through which the said gas flow (34, 35) circulates from the upstream side to the downstream side, in the X longitudinal direction on all sections burned simultaneously in the said rotating fire, each of the said wall, of a section comprising two vertical lateral partitions (38) in the X-Z plane, and elements in the transverse Y direction for deflecting the said gas flow passing through the said wall and maintaining a constant spacing between the said lateral partitions (38), characterized in that each wall (3) comprises a means of maintaining, over at least one third of the length L of said wall, a gas flow of rate D uniformly distributed over the entire normal cross-section S of the said wall in the Y-Z plane, with a degree of uniformity of the said flow distribution D defined by the expression ""2yD-0.5yD/yS"", where ""2yD-0.5yD"" denotes the extent of the range of the flow of rate D corresponding to a fraction y of the said normal cross-section S, and in which y is not more than 0.25.