Oxygen Enriched Bottom Blowing Bath Smelting Temperature Control Method Based on Variable Universe Fuzzy-PID

The oxygen enriched bottom blowing furnace is one of the main equipment in production of copper matte, the smelting process in oxygen enriched bottom blowing bath is integrated complexities, such as strong coupling, nonlinearity and large time delay. Temperature is key factor for matte grade and is difficult to control accurately. A variable universe fuzzy-PID controller was designed in this paper, the concept of variable universe was combined with fuzzy-PID, the scale factor α₁( t ) and α₂ ( t ) of error e(t) and the error rate of change é(t) was regulated according to their grade, the scale factor, β₁ ( t ) , β₂ ( t ) , β₃ ( t ) of correction parameters of PID controller was regulated according to α₁( t ) and α₂( t ), then the simulation results of conventional PID algorithm, fuzzy-PID algorithm and variable universe fuzzy-PID algorithm of the oxygen enriched bottom blowing bath smelting temperature control system were compared with each other.