Submerged arc furnace's structural features

Submerged furnace's structural and working characteristics

Submerged arc furnace is an industrial electric furnace with huge power consumption. It is mainly composed of furnace shell, furnace cover, furnace lining, short net, water cooling system, smoke exhaust system, dust removal system, electrode shell, electrode pressure release and lifting system, loading and unloading system, controller, burnthrough device, hydraulic system, submerged arc furnace transformer and various electrical equipment.

According to the structural and working characteristics of the submerged arc furnace, 70% of the system reactance of the submerged arc furnace is generated by the short network system, which is a high current working system, and the maximum current can reach tens of thousands of amps. Therefore, the performance of the short network determines the performance of the submerged arc furnace. 

For this reason, the natural power factor of the submerged arc furnace is difficult to reach more than 0.85, and the natural power factor of most furnaces is between 0.7 and 0.8, The lower power factor not only reduces the efficiency of the transformer and consumes a lot of reactive work, but also is fined by the power department. At the same time, due to the manual control of the electrode and the stacking process, the power imbalance between the three phases increases, and the maximum imbalance can reach more than 20%, which leads to the low smelting efficiency and the increase of electricity charge. 

Therefore, improving the power factor of the short network and reducing the power grid imbalance becomes the key to reducing energy consumption, An effective means to improve smelting efficiency. If appropriate measures are taken to improve the short network power factor, the following effects can be achieved:

(1) Reduce power consumption by 5 ~ 20%;

(2) Increase output by more than 5% ~ 10%