The main factors affecting graphite electrode consumption

 

The consumption of graphite electrode in EAF steelmaking runs through the whole smelting process, and its consumption is affected by many factors. This paper only analyzes the operation of smelting process.

1.Poor quality or improper proportion of scrap steel leads to poor slagging effect and prolonged smelting time

The increase of feeding times and drilling data increases the probability of damage and fracture of electrode bottom; Longer smelting time is the direct factor that leads to the increase of power consumption and electrode consumption and loss.

2.Two electric furnace power supply equipment and electrode specifications do not match

Electric arc furnace power transmission is a high-current and low-voltage operation. If the capacity of the power supply equipment is too large and exceeds the limit load of the electrode, the electrode will be reddened from bottom to top within 5~10min after arc starting, and the boundary of the joint is very obvious and most of them have broken accidents; If the current is too high or fluctuates too much, the joint breaking frequency at the joint will increase and the bottom consumption will be tapered. If the power supply capacity is low, the furnace temperature will not meet the process requirements within the effective medium heating time, and the operation will need to be delayed. Overload and overtime operation is the biggest loss and consumption of graphite electrode.

3. Oxidation stage forcibly increases chemical energy and improves smelting intensity

In smelting, the oxygen blowing amount (generally less than 45m/t) is forced to increase to achieve rapid melting and raise the furnace temperature, so that the furnace condition is bad, the furnace and the furnace are in an oxygen-enriched state, and each phase electrode is in a high-temperature flame. When the electrodes are in such furnace conditions, most of them have serious phenomena of delamination and surface oxidation.

4. Technical configuration and operation of electric furnace

There are essential differences between modern electric arc furnace and traditional electric furnace. The appearance of ultra-high power large-scale electric arc furnace and hot charging steelmaking process have improved the smelting strength and productivity, thus putting forward higher technical requirements for the quality of graphite electrode. In operation, the selection of power transmission curve and gear, the control of arc starting and arc stabilizing voltage and current, the coordinated use of long, medium and short arcs, and the configuration and application of water cooling system all play a key role in the service life and consumption of electrodes.

5. Quality of graphite electrode

At present, the requirements for oxidation resistance and thermal shock resistance of graphite electrode are becoming more and more intense in the smelting and process of electric arc furnace, and the high consumption caused by quality fluctuation is greatly concerned by direct users. Therefore, the balance and stability of graphite electrode quality are the most important factors to determine the consumption.

Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making?refractory products?for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc.

Article Source:The main factors affecting graphite electrode consumption

Company name ： Wanhao Refractory

Email:sales100@wanhaorefractory.com

Website: http://www.wanhaorefractory.com/

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