Blast furnace (BF) Sample Clauses

Blast furnace (BF). The process is an almost continuous process where coke, ore and slag formers are charged at the top of the blast furnace and blast is blown in in the lower part. The slag and hot metal forms and sink to the bottom of the furnace and are tapped approximately every hour. Additionally to the basic material flow described above, the blast is combined with xxxxxx- ized coal injection. Figure 1: A blast furnace described in the text, blue parts is coke and ore layers, yellow is the blast air, red the liquid slag and purple is the hot metal (liquid iron). The reduction gas is leav- ing the system in the top of the furnace and slag and iron is tapped from the bottom approxi- mately every hour. The blast furnace system is regulated to a stable process but disturbed in different ways: 1. The chemical composition of coke and ore varies. 2. Charged material contains alkali metals and Xxxx which is described more lately. 3. The permeability of the solid layers is not stable and cause different gas distributions in the furnace. 4. Blast air contains different amount of moisture. 5. The charged materials contain different amount of fines, even if fines are screened before charged into the furnace. 6. The charged material contains (or break down to) different amount of fines. Overall the process is very slow in the meaning: changes in process settings needs a settle time of several hours before the effect of the changes are observed. Figure 2: Image of LKAB's experimental blast furnace. The LKAB Experimental blast furnace (Figure 2) was built as a unique pilot plant to perform trials of pellets and blast furnace technology prior adaption to production plants.
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