Chemistry: electrical and wave energy – Processes and products
Patent
1985-12-31
1987-05-26
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
204244, 204247, C25C 306, C25C 320, C25C 322
Patent
active
046683526
ABSTRACT:
A process for automatically going into the mode for increased suction extraction of the gases emitted by the tanks of series for the production of aluminium by igneous electrolysis using the Hall-Heroult process, each tank being closed around its periphery by a plurality of removable covers which are disposed in substantially sealed relationship with each other and between each thereof and their support means on the periphery of the tank, the gases being collected over each tank by at least one duct connected to a centralized suction extraction system.
The temperature of the gases in the duct is continuously measured. Opening of at least one cover gives rise to an abrupt drop in temperature, which makes it possible to put the system into the increased suction extraction mode, which will be automatically stopped when, all the covers being closed again, the temperature of the gases will substantially resume its initial value.
The power required for the suction system is thus substantially reduced.
REFERENCES:
patent: 4051224 (1977-09-01), Duclaux et al.
Duprat George
Langon Bernard
Sulmont Benoit
Aluminum Pechiney
Williams Howard S.
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