A new specialised conveyor for HDRI, a 116 m long BZB-H-I 900/400 designed for a capacity of 323 tph hot DRI at 750 °C, has been supplied to Tosyali’s new steel plant in Algeria.
The improved sealing of this conveyor protects the material from the environment; the inert system prevents the reoxidisation of the highly reactive bulk material and permits the transportation of the DRI without great losses in the level of metallisation.
“In order to produce the same amount of steel a far smaller energy input into the electric arc furnace is required. Therefore the tap-to-tap cycles are reduced and productivity can increase by up to 20%”, explained AUMUND Project Manager, Christian Niedzwiedz.
The AUMUND specialised conveyor for HDRI will be used as the connection between the Midrex shaft furnace and an electric arc furnace.
Tosyali is currently building the world’s largest DRI plant, located in Bethioua, Algeria, with Midrex technology. The new direct reduction plant will have a production capacity of 2.5 million t of DRI.
The conveying of hot DRI (HDRI) to the electric arc furnace has considerable advantages. The requirement for electrical energy per ton of molten steel is significantly reduced. The energy reduction is achieved because the input material retains the heat that it already has when it comes out of the DRI production process. Therefore less energy is needed to melt it down, and automatically the melting process takes less time. Because the material is filled directly into the furnace, the lid does not need to be opened, so even more time and energy is saved.
“Compared with cold charging, the conveying of HDRI saves up to 6% on electrode consumption. The tap-to-tap times and primary energy source carbon requirements are reduced, so this in turn reduces the CO2 emissions”, according to Christian Niedzwiedz. When HDRI enters the furnace at approx. 600°C the energy saving is more than 120 kW/t of molten raw steel.
Read the article online at: https://www.drybulkmagazine.com/product-news/11102016/aumund-conveyor-sold-to-algeria/