Osmelt furnace structure overview

September 30, 2022

The structure of the Osmelt furnace is shown in Figure 4, which is divided into three parts: the bottom wall (including the hearth and the discharge port), the upper wall and the cone. The furnace shell is rolled from steel plates and welded according to the design dimensions. The top includes gun port, feed port, spare burner port, sampling port and waste heat boiler port.


All heated surfaces are lined with refractory bricks. The bottom of the hearth is mainly composed of high-grade clay refractory bricks and ramming mixture. Except for the area around the tap, the entire outer surface of the furnace shell and cone is water-cooled with vertical sleeves welded to the surface. There is a slag outlet and a lead outlet in the lower part of the furnace shell, surrounded by double-layer casing (non-vertical casing). The furnace body is supported by a lattice bed structure.


Austrian furnace smelting process products can be discharged through the discharge port. The discharge port can be opened by an oxygen blowing pipe or an air pick. To close the slag discharge port, use a "mud plug" to close it manually or spray clay through a mud gun gun to close the discharge port, including the metal discharge port and the slag discharge port.


The discharge port used by the Austrian furnace contains two layers (external or internal) of water-cooled copper baffles. The discharge port is used to discharge the melt in the furnace. The vent baffle cooling system cools the vent baffle as the furnace discharges, as shown in Figure 6.

Reduces corrosion of drain inserts, protects water cooling, reduces wear of fireproofing material behind internal drain baffles, and cools the melt after draining stops, helping drain closures.


The vent baffle insert is one of the fastest wearing parts of an Osmelt furnace due to the very rapid thermal cycling it undergoes and its severe corrosion. Water cooling the vent flap inserts reduces their wear rate and therefore reduces the frequency of their replacement. Austrian furnaces use inserts made of machined graphite and housed in a wedge-shaped system with springs. Use the metal drain as a full drain to completely drain the melt in the furnace before the furnace is shut down or during an "emergency drain".

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