| 摘要 |
A method is provided for maintaining a predetermined effluent gas pressure within an electric arc melting furnace of the type having an off-gas duct system. The method involves establishing, by simulation, correlations between specific measurable physical characteristics within the furnace and in the off-gas duct system and then utilizing these correlations to establish a program for automatically varying the volume of off-gas flow through the duct to maintain effluent gas pressure within a desired range within the furnace. Sensors are provided in the duct system to monitor the physical characteristics in the off-gas flow and for transmitting data to a microprocessor adapted to operate flow-regulating apparatus in the duct system to thereby maintain the pressure within the furnace within a predetermined range. The preferred structure for implementation of the disclosed method includes sensors on the duct structure for constantly monitoring variable physical characteristics of the effluent flow within the duct, and control means adapted to be responsive to signals from the sensors and to operate the draft regulating apparatus to vary the effluent flow through the duct and thereby maintain the effluent pressure within a predetermined range within the furnace.
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