Reasonable Arrangement of Busbars Position for Submerged Arc Furnace

Reasonable Arrangement of Busbars Position for Submerged Arc Furnace

The busbars system of large-capacity submerged arc furnace has large current, high intensity, high electromagnetic induction intensity, increased power loss and low power efficiency.

When making it, the layout method, cross-section and shape of the conductor should be properly considered to increase the magnetic resistance when carrying current, try to make its mutual inductance compensate for self-inductance, weaken the magnetic field between conductors, and thus improve the power efficiency of large-capacity submerged arc furnace short-circuit.

The short-circuit reactance has such an important impact on the submerged arc furnace, and the reactance calculation is complicated and has large errors. In addition to the short-circuit length, the shape of the short-circuit copper tube (row), the number of spacing roots (pieces) and the short-circuit layout method have a direct impact on the inductance.

Therefore, when designing the short-circuit, try to make these parameters of the short-circuit busbar as reasonable as possible to reduce the power loss of the short-circuit.

(1) From the calculation formula, considering the geometric mean distance problem, the smaller the copper tube spacing or copper bar spacing, the smaller the inductance calculation result. However, considering the heat dissipation, installation and dust collection and slag falling conditions, the spacing cannot be too small. Especially when copper tubes are used as conductive busbars, the connection of cooling water hoses must also be considered, so the spacing of copper tubes is larger than that of copper bars.

(2) Appropriately increase the number of conductors and increase the distance between the conductors of the same phase to reduce the self-inductance reactance.

(3) Conductors with equal current and opposite phases in the busbars system should be crossed and arranged close to each other to facilitate electromagnetic mutual inductance to compensate for self-inductance, thereby reducing the synthetic impedance and improving the efficiency of the short-circuit network. That is, the head and tail outgoing wires of the same winding of the transformer are staggered and arranged as close as possible until they are close to the electrode branch.

(4) Because the reactive voltage component in the busbars system conductor is the product of current and inductive reactance. A slight change in inductive reactance will cause a great change in the reactive voltage component and the power factor of the ore-fired furnace. The greater the reactive power, the more electricity is consumed, and the lower the output. Therefore, if the magnetic field between conductors is weakened, such as pressure rings (half rings, conical rings, etc.), non-magnetic conductive materials should be used or magnetic isolation should be used to disconnect the magnetic circuit.