Continuous ring baking furnaces of the Hoffmann type
OwnerJean L. Genevois, Roberto Falohi +2inventors
InventorsJean L. Genevois, Roberto Falohi, Giovanni Costantini, Paolo Presti
Life of this patent
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Abstract
An automatic control system for a continuous ring furnace, wherein the chambers and groups of chambers are operated successively in different phases of the baking cycle; the condition of certain chambers being monitored to obtain signals representing actual parameters and the signals being fed to a computer for comparison to optimum values and correction of any observed deviations therefrom.
Claims7
In combination with a continuous ring furnace for baking and rebaking of carbon bodies, said furnace comprising a plurality of chambers arranged in a continuous ring, each chamber including a capacity for receiving bodies to be heated and a separate fire-pit adjacent said capacity, the furnace comprising further a flue duct operatively connected to each chamber and provided with a suction fan and an outlet stack connected to the flue duct,
- the operation of the furnace as a whole being characterized by the simultaneous operation of phased adjacent pairs of chambers wherein
- (a) at least one pair of chambers is in pre-heat phase,
- (b) at least one pair of chambers is in distillation phase,
- (c) at least one pair of chambers is in preparation,
- (d) at least one pair of chambers is provided with fuel burners,
- (e) at least one pair of chambers is in cooling phase, and
- (f) at least one pair of chambers is uncovered and provided with equipment for recycling of fumes by means of a pressure fan,
- the improvement which includes a coordinated computerized data collection and processing system for measurement, control, and regulation of the temperature and the gas flow in groups of chambers and single chambers in a group, which system comprises
- a thermal sensor in each chamber of groups (a), (b), (c), and (d);
- a first pressure sensor in the last chamber of group (a) which is connected to said flue duct;
- another pressure sensor in the first chamber of group (f) adjacent to the last chamber of group (e), which chamber is also provided with said recycling equipment;
- a first means placed in the flue duct between said suction fan and the stack for measuring the gas flow;
- a second means for measuring the gas flow placed in the recycling equipment;
- a first means for regulating the speed of an electric motor operatively connected to the suction fan motor;
- a second means for regulating the speed of an electric motor operatively connected to the motor of the recycling pressure fan;
- means in each chamber of group (b) for lowering the temperature;
- and
- valves adapted to regulate the flow of fuel to the burners.
Dependencies are inferred from the claim text.