Continuous ring baking furnaces of the hoffmann type

Details Continuous ring baking furnaces of the hoffmann type Continuous ring baking furnaces of the hoffmann type

F - Mech Eng,Light,Heat,Weapons

27

B

18/1

F27B 9/40 (2006.01) F27B 13/00 (2006.01)

Patent

CA 1148739

ABSTRACT OF THE DISCLOSURE Disclosed herein is an improvement in a continuous ring kiln of the Hoffmann type for baking carbon bodies, said kiln including several pits placed one after the other and inter- connected like a ring, a flue duct provided with a suction fan and an outlet stack, in said kiln being simultaneously: a) at least a group of pits in pre-heat; b) at least a group of pits in distillation; c) at least a group of pits in preparation; d) at least a group of pits with burners, where special burners are placed for burning fuel; e) at least a group of covered pits in cooling; and finally f) at least a group of uncovered pits in cooling; and equipment for recycling the fumes according to U.S. Patent No. 4,215,982 of Genevois et al., including a compression fan. The improvement in question comprises a system for measurement, control and regulation of the tempera- ture and the flow in several groups of pits or single pits of a group, such system including: a thermal sensor in each pit of said groups: a); c) and d); a first pressure sensor in the last pit of group a) which is connected with said flue duct; another pressure sensor placed in the last pit of group f) next to the pit of group e) and provided with the said re- cycling equipment; a first device placed in the flue duct between said suction fan and the stack for measuring the flow; a second device for measuring the flow placed in the above equipment for recycling the fumes; a first device for regulating the speed of an electric motor combined with the motor of said suction fan; a second device for regulating the speed of an electric motor combined with the motor of said suction fan; a second device for regulating the speed of an electric motor connected with the motor of said compression fan; an equipment for lowering the temperature, placed in each pit of group (b), and valves regulating the fuel inflow into the burners.

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