Title

Dynamic Blowend - Determination of the LD-Process (1)

Dynamic Blowend - Determination of the LD-Process (1)

Authorship

OPITZ, A.; SICKERT, G.; MITTERMAYR, F.; PIRKLBAUER, W.

OPITZ, A.

I am this author

SICKERT, G.

I am this author

MITTERMAYR, F.

I am this author

PIRKLBAUER, W.

I am this author

DOI

10.5151/2594-5300-30Aciaria-83-100

Downloads

Abstract

The LD-Steelplant of EKO is equipped with 2 x 240 t Converters operating in one out of two converter mode. Since summer 1998 at both converters a continuous waste gas analysis system (the so-called “LOMAS®”-system) has been put into operation. In a joint project between EKO and VAI the dynamic process model “DYNACON” has been added using the waste gas analysis system for blowend determination of the LD-process. Since October 1998 this model is implemented and a comprehensive test work was carried out in the following months. The principal feature of this dynamic model is the cyclic determination of the remaining blowing time during the last 2 minutes of the blowing process (“count-down”), depending on the target carbon content at the blow-end. The test work has shown that already in the initial phase the target carbon in a range of + 0.005 % can be achieved with a hitting rate of approx. 80 %. The boundary conditions for meeting this hitting rate will be discussed and the potential improvement thereof will be mentioned in this paper. Additionally the benefits gained by dynamic controlling the blowend in terms of slag iron, oxygen activity and aluminum consumption will be given.

The LD-Steelplant of EKO is equipped with 2 x 240 t Converters operating in one out of two converter mode. Since summer 1998 at both converters a continuous waste gas analysis system (the so-called “LOMAS®”-system) has been put into operation. In a joint project between EKO and VAI the dynamic process model “DYNACON” has been added using the waste gas analysis system for blowend determination of the LD-process. Since October 1998 this model is implemented and a comprehensive test work was carried out in the following months. The principal feature of this dynamic model is the cyclic determination of the remaining blowing time during the last 2 minutes of the blowing process (“count-down”), depending on the target carbon content at the blow-end. The test work has shown that already in the initial phase the target carbon in a range of + 0.005 % can be achieved with a hitting rate of approx. 80 %. The boundary conditions for meeting this hitting rate will be discussed and the potential improvement thereof will be mentioned in this paper. Additionally the benefits gained by dynamic controlling the blowend in terms of slag iron, oxygen activity and aluminum consumption will be given.

Keywords

LD-Process, Blowend Determination, Dynamic Process Model, Waste Gas Analysis, DYNACON

LD-Process, Blowend Determination, Dynamic Process Model, Waste Gas Analysis, DYNACON