초록 ▼

A safe and effected method of starting up operating and shutting down a plasma fired cupola. The starting up and shutting down procedures incorporated interlocks and warning signals that insure the safety of the operators and equipment and the controls utilize the temperature of the iron in the spou

A safe and effected method of starting up operating and shutting down a plasma fired cupola. The starting up and shutting down procedures incorporated interlocks and warning signals that insure the safety of the operators and equipment and the controls utilize the temperature of the iron in the spout as a focal point to control the torch output by separately changing field current, arc current, and torch air supply, to compensate for changes in charge make-up, particulate feed, percentage of shroud air to shroud recirculating gases to produce different irons at various melt rates.

대표청구항 ▼

A method of controlling a plasma torch disposed in a feed nozzle, the plasma torch having an air supply, arc current supply, and a field current supply, which cooperate to raise and lower the heat output of the plasma torch to make molten iron from scrap metal, at a desired melt rate the molten iron

A method of controlling a plasma torch disposed in a feed nozzle, the plasma torch having an air supply, arc current supply, and a field current supply, which cooperate to raise and lower the heat output of the plasma torch to make molten iron from scrap metal, at a desired melt rate the molten iron being removed from the cupola at a predetermined temperature selected for the type of iron being produced via a spout disposed in the lower end of the cupola; the method comprising the steps of: measuring the temperature of the molten iron in the spout; comparing the measured temperature of the molten iron in the spout with the predetermined temperature selected for the type of iron being produced; setting air flow, arc current and field current to the plasma torch in a range which will provide the heat input required to produce the desired melt rate; individually changing the arc current, air flow and field current being supplied to the torch to change the heat output of the plasma torch, until the measured temperature of the molten iron in the spout equals the predetermined temperature.