Title

ADVANCED STOVES OPERATION WITH SIMETAL BF VAiron

ADVANCED STOVES OPERATION WITH SIMETAL BF VAiron

Authorship

Habermann, Arno; Marout, Alexander; Fritschek, Harald; Kronberger, Thomas; Schaler, Martin

Habermann, Arno

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Marout, Alexander

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Fritschek, Harald

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Kronberger, Thomas

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Schaler, Martin

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DOI

10.5151/2594-5335-23911

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Abstract

The stoves system of a modern blast furnace is the most important single energy consumer in the ironmaking area and it offers significant energy saving potentials at most of the producers. The challenge for each plant operator is optimizing the energy input while keeping the blast temperature at the setpoint for given targets of the blast flow rate and the wind time. Additionally the stoves system must have a defined energy reserve in order to allow the operator to increase the blast output temporarily. Siemens VAI’s answer to these challenges is the Stoves Control Model which is offered as a standalone package or as part of SIMETAL BF VAiron. The first part of the paper describes the main control modules of the process model. Based on an online energy balance of the stoves system the required energy input until the end of the gas phase is computed which results in the setpoints for the mixed gas flow rates. The self-tuning algorithms are outlined and the required instrumentation is listed. The second module is an online combustion calculation which finally gives the necessary mixed gas enrichment for reaching the target blast temperature. The second part of the paper gives an overview of the installation of the Stoves Control Model at blast furnaces #1 and #4 at voestalpine Stahl Donawitz in Austria. The topologies of the stoves systems are shown and the control modules are described. Additionally we give long term performance results of the stoves models. The paper concludes with an overview of other recent installations of the control model worldwide with various layouts of the stoves systems.

The stoves system of a modern blast furnace is the most important single energy consumer in the ironmaking area and it offers significant energy saving potentials at most of the producers. The challenge for each plant operator is optimizing the energy input while keeping the blast temperature at the setpoint for given targets of the blast flow rate and the wind time. Additionally the stoves system must have a defined energy reserve in order to allow the operator to increase the blast output temporarily. Siemens VAI’s answer to these challenges is the Stoves Control Model which is offered as a standalone package or as part of SIMETAL BF VAiron. The first part of the paper describes the main control modules of the process model. Based on an online energy balance of the stoves system the required energy input until the end of the gas phase is computed which results in the setpoints for the mixed gas flow rates. The self-tuning algorithms are outlined and the required instrumentation is listed. The second module is an online combustion calculation which finally gives the necessary mixed gas enrichment for reaching the target blast temperature. The second part of the paper gives an overview of the installation of the Stoves Control Model at blast furnaces #1 and #4 at voestalpine Stahl Donawitz in Austria. The topologies of the stoves systems are shown and the control modules are described. Additionally we give long term performance results of the stoves models. The paper concludes with an overview of other recent installations of the control model worldwide with various layouts of the stoves systems.

Keywords

Blast furnace; Stoves; Process optimization; Control model; Performance data.

Blast furnace; Stoves; Process optimization; Control model; Performance data.