Lining for use in blast furnaces

Abstract

A lining for use in a blast furnace preferably for use in furnaces burning bio fuels, e.g. straw or wood chips or wood shavings and the like as well as ovens in power stations where fuel having a biological origin is used includes an interior surface which is in contact with slag particles. The interior surface is clad by elements ( 3, 4, 12 ) made by a ceramic or semi-ceramic material and an insulation of a cement based foam material is arranged in one or more layers ( 17 ). The foam material is advantageously placed between the interior surface and an exterior load carrying construction which for example can be a steel pillar arranged exterior of the blast furnace. With a lining for blast furnace as describes above the risk of a collapse in the insulating material is avoided at the same time it is avoided that the interior wall deteriorates due to the chemical composition of the slag particles which are present in the bio fuelled oven.

1 . A lining for use in blast furnaces as used in power stations and the like having an interior surface which can come into contact with slag as well as an insulating layer consisting of an inorganic insulating material which surrounds the blast furnace, characterized in that the insulation comprises one or more layers of a cement based foam and that the interior lining is made from a ceramic or semi-ceramic material.  
     
     
         2 . A lining for use in blast furnaces for power stations and the like, especially blast furnaces using fuel of a biological origin, characterized in that the interior surface is made from a ceramic or semi-ceramic material and that an insulation in the form of one or more layers of a cement based foam is provided surrounding the ceramic or semi-ceramic surface.  
     
     
         3 . Lining according to  claim 1  or  2 , characterized in that the foam is placed between the interior surface and the load carrying structure which is arranged outside the blast furnace.  
     
     
         4 . Lining according to  claim 1 ,  2  or  3 , characterized in that the foam is foamed in situ in a space between the interior surface and the load carrying structure.  
     
     
         5 . Lining according to any of the preceding claims, characterized in that the interior surface is made from a concrete like material comprising a high temperature resistance cement, preferably an aluminous cement, as well as a binder of ultra fine particles, preferably of an amorphous silica in order to obtain a compact binding in the material.  
     
     
         6 . Lining according to any of the preceding claims, characterized in that the load carrying construction is made from reinforced concrete.  
     
     
         7 . Lining according to any of the preceding claims, characterized in that the interior surface is resistant to the influence of alkaline slag particles at temperatures in the range of at least 350° C. and 400° C. and preferably up to the range of 1100° C. to 1200° C.  
     
     
         8 . Lining according to any of the preceding claims, characterized in that the interior surface is made from premanufactured elements.  
     
     
         9 . Lining according to  claim 8 , characterized in that the premanufactured elements contain a reinforcement netting and that there are openings for the reception of means for attaching the elements to the load carrying construction.  
     
     
         10 . Lining according to  claim 1  or  3 - 10 , characterized in that the interior surface is of metal, preferably steel.