Abstract: Through real-time production data acquisition and chemical composition analysis of raw materials from a 25 500 kV·A calcium carbide furnace in a calcium carbide factory，dynamic material balance and heat equilibrium were calculated， and an online mathematical model for power-saving control of submerged arc furnace was established.Thus the calcium carbide liquid ingredients，gas composition，and energy consumption of each calcium carbide production unit could be predicted in real-timeand material flow and energy flow in the calcium carbide furnace could be quantified.Finally，the optimization for the calcium carbide liquid discharged management control and online monitoring of calcium carbide furnace electricity consumption were realized.Through calculation，the power consumption of production 1 t of calcium carbide fluid was 3 205.78 kW·h， reduced by about 100 kW·h compared with the average power consumption before management optimization.The energy utilization ratio was 50.03%，and the sensible heat taken away by the products was 22.83%.

Key words: calcium carbide furnace, power consumption, material balance, thermal balance