Hoogovens Groep B.v.

Joseph A Van Der Hoeff

Ronald N Molenaar

A shaft furnace with a steel outer shell and a refractory lining inside the shell, has a sealed tap hole structure comprising a steel sleeve fitted to the outer shell, a permanent lining inside the sleeve and a refractory sealing material within said permanent lining. To improve the gas-tightness of the tap hole structure, a metal closure plate having an opening at which the tap hole is to be formed, is located within the steel sleeve and has its periphery coupled gas-tightly to the sleeve. A metal closure sleeve is coupled gas-tightly to said closure plate around said opening thereof and extends outwardly from said closure plate. Means e.g. conductive bricks are provided for removing heat from the closure plate and the closure sleeve.

Shaft furnace

In the repair of a refractory lining of a shaft furnace having a steel shell, a worn residual refractory lining inside the shell and cooling plates extending through the shell into the refractory lining, the worn lining is retained and an additional lining structure is added by

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Limmen, Netherlands

Joseph A Van Der Hoeff