Blast Furnace01.ppt

Blast Furnace Name:liu-yu-long Major:Metallurgical engineering Class:103 Fig. The inside profile of the blast furnace 1.The Introduction to the blast furnace The furnace is built on a foundation of pilings and concrete to support the furnace and burden .The inside profile of the blast furnace is termed (from top to bottom) furnace throat ,shaft, belly, bosh and hearth,the lower portion of the fornace is called the hearth .The hearth comprises carbon side wall and a central composite plug. 1.The introduction to the blast furnace One or more iron notches are located above the hearth,and molten iron and slag are removed through them . Above the iron notch is the slag notch. With modern low slag volume practice, the slag notch is typically for blowing-in or emergency use only.The portion above the hearth is the bosh ,and the bosh angle is a critical parameter in the design of the furnace. 1.The introduction to the blast furnace The belly of the widest point can be cooled by a variety ofmethods.The bosh and stack usually have ceramic lining.The throat is cylindrical and is referred to as the stockline section.The top of the furnace directs the gas to the offtakes. The blast furnace is the main equipment of iron-making,and blast furnace pulverized coal injection candramatically reduce coke rate and the dependency on increasing shortage of coke resouece,so it is the most effective approach to reducing the iron-making cost and has become an important part in blast furnace iron-making technology advances. 2.The Function of The Blast Furnace 2.The function of the blast furnace When the charge feeding into the blast-furnace ,the charge meet the rising gas in the process of it comes down,then,it is heated and have a reaction with the reducing agent.Some substance are volatilized and decomposed,iron and some elements oxide are reduced.Then the iron is