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Cupola furnace is the most commonly used for the melting of ferrous metals and alloys. The key challenge in this paper is variation of air blast which lead to productivity loss and moreover affects the small scale industries. In order to overcome the above key challenge our work has proposed a Dually Operated Control Cupola Furnace which states that constant air blast can be obtained by controlling manually as well as automatic. Manual operation is obtained by maintaining constant Motor-Torque-Speed-Ratio using inverter driven blower along with space vector pulse width modulation. Automatic operation inhabits a feedback control system using nonlinear model predictive controller which is operated on control valve driven blower. Automatic operated cupola furnace obtains a prediction value for obtaining the productivity gain based on number of experimental observations and overall gives the required constant air blast by considering blast volume, blast temperature and oxygen enrichment. Thus our model enhances the system performance by achieving productivity gain in terms of melting rate and super heating temperature. Keyword: Bridge Rectifier, Inverter, Vector Space Pulse Width Modulation, Parameterized NMPC, Microcontroller, Oxygen, and Temperature Sensor, Control Valve, Pressure Gauge.

DUALLY OPERATED CONTROL CUPOLA FURNACE WITH MAINTAINING CONSTANT AIR BLAST FOR IMPROVING PRODUCTION GAIN OF IRON