Furnace j line manual#

ROOF RAISE/ROTATION to allow the basket to charge the scrap into the furnace.To arrange all the EAF operations several movements are needed as follows: Opening areas may also be provided low in the furnace sidewall for injection of oxygen, lime or carbon. Other several ports could be installed around the furnace shell to be equipped with burners. In the side tapping EAF a tapping spoutis installed at the sidewall of the furnace while in the bottom tapping EAF a EBT system(tap hole) is installed at the bottom part.

Furnace j line manual#

The sidewall of the furnace is equipped with a slag doorfor slag removal operations and also for additional operations such as the using of manual oxygen lances. An additional hole (called ' fifth hole') may be provided for other operations such as the continuous feeding of DRI and HBI or injections of coal and lime. Another hole (called ' fourth hole') is used for the extraction of the furnace fumes (suction system). 1.5 OPENING AREASĭelta refractory roof is equipped with three opening areas where the graphite electrode columns can go inside the furnace. Generally, roof and electrode supports can be moved together or independently. This delta section has minimum opening around the electrodes without risk of arcing between the electrodes and the water cooled panels. The refractory deltasection is inserted to fill this opening. This is a kind of cage where water cooled panels are inserted and form a cylindrical opening at the centre. The roof consists of a water cooled roof ring which forms the outer perimeter. The upper part, called roof, of the furnace is a flattened sphere. The upper sidewall shell is also covered by a refractory lining (bricks). Once the shell is removed, the furnace bottom can also be changed out. In most of the EAF this part can be easily removed from the bottom. The upper part is composed by a cylindrical shell.

In the EBT EAF the furnace bottom contains the tapping mechanism (eccentric bottom) and sometimes also a gas stirring elements (well blocks purging plugs). The bottom is covered by a refractory lining which generally is composed by a safety lining (normally bricks) and working lining at the top (normally ramming mass). This system is needed in order to tilt the furnace for tapping (spout or EBT system) at one side and for removing slag from the other side (slag door). It's connected to a cradle arm which has a curved segment with geared teeth that sits on a rocker rail. It's composed by the lowest part, the bottom, that has a spherical shape like a dish. FURNACE STRUCTURE 1.1 LOWER BOTTOM SHELLĪ typical EAF has a cylindrical shape.