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Method and tunnel type furnace for calcining carbonaceous bodies, in particular electrodes
| Details |
Inventors: Corato, Renzo; Ganapini, Giulio; Meier, Hans-Anton; Poggi, Mauro; Rosso, Antonio; Sanchioni, Sergio;
Assignee: Alusuisse Italia S.p.A. (Milan, IT); Italimpianti Societa Italiana Impianti p.A. (Genoa, IT); Sirma S.p.A. (Malcontenta, IT)
Primary Examiner: Yuen; Henry C.
Assistant Examiner:
Attorney, Agent or Firm: Modiano; Guido, Josif; Albert
The method comprises passing preformed bodies to be calcined, containing pyrolyzable substances, through a furnace having, arranged in succession, a first heating zone, a second or combustion zone wherein volatile substance released by said bodies are subjected to combustion, a third or calcining zone, and a fourth or cooling zone. Separation means between the first and second zones, and between the third and fourth zones, prevent the flue gases from flowing between such zones. |
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DETAILED DESCRIPTION This invention is directed to improve the methods and tunnel type furnaces therefor, as indicated in the preamble, so as to provide for substantially complete combustion of the volatile substances from the binder of the carbonaceous products, thus affording a better solution to the environmental problems connected with calcining such products, and suitable conditions for a more economical operation of the furnace by an improved utilization of the available heat.
This problem is solved by the invention by virtue of a method of calcining carbonaceous bodies, in particular electrodes, wherein preformed bodies (CA) to be calcined, comprising a mixture of a carbonaceous material and a binder containing pyrolyzable substances, are passed through a tunnel type furnace supplied with an oxidizing atmosphere and having, in succession, a first or heating zone, a second or combustion zone wherein the volatile substances from the binder are burned off in a substantialy complete manner, a third or calcining zone, and a fourth or cooling zone, characterized in that: (a) in said first zone, the carbonaceous bodies are heated by means of flue gases drawn through at least one intermediate outlet between said second and third zones, said flue gases being introduced into said first zone countercurrently with the movement of said carbonaceous bodies; (b) in said second zone, a stream of flue gases is established cocurrently with the movement of said carbonaceous bodies toward said intermediate outlet, whereat a furnace temperature of 750.
degree.
-850.
degree.
C.
and an oxygen content in the furnace atmosphere of at least 1% by volume are maintained, thereby substantially complete combustion of said volatile substances can be ensured; (c) in said third zone, a stream of flue gases is established countercurrently with the movement of said carbonaceous bodies toward said intermediate outlet, and at least in the portion of said third zone adjoining said intermediate outlet, a sufficient oxygen content is maintained to ensure complete combustion of said volatile substances; and (d) in said fourth zone, cooling air is blown in countercurrently with the movement of said carbonaceous bodies, toward at least one air outlet provided at the initial portion of said fourth zone
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