Title

Potentials for Utilization of Coke Oven Gas in Integrated Iron and Steel Works

Potentials for Utilization of Coke Oven Gas in Integrated Iron and Steel Works

Authorship

DIEMER, PETER; KILLICH, HANSJÜRGEN; KNOP, KLAUS; LÜNGEN, HANS BODO; REINKE, MARTIN; SCHMÖLE, PETER

DIEMER, PETER

I am this author

KILLICH, HANSJÜRGEN

I am this author

KNOP, KLAUS

I am this author

LÜNGEN, HANS BODO

I am this author

REINKE, MARTIN

I am this author

SCHMÖLE, PETER

I am this author

DOI

10.5151/2594-357x-34Red-433-446

Downloads

Abstract

Main function of a coking plant is to supply blast furnaces with coke. In an integrated iron and steel works an interlinked energy network exists between the blast furnace and coking plant. From the classical coke oven raw gas treatment by-products like tar, benzole and sulphur are recovered, from which only little profit is yielded today. Thus, the profitability of construction and operation of gas treatment and by-product plants as integral part of a coking plant is not always assured. This gave rise to numerous deliberations and attempts made in the past to utilize the raw gas from the coking process for a different purpose. An economically reasonable alternative would be the so-called 2-Product Coking Plant, where – besides coke – either energy, reduction gas, hydrogen or methanol is produced, depending on the coke oven raw gas treatment. The technology of coke oven gas injection into the blast furnace has already been proven in practice. Another interesting alternative for the production of hot metal and crude steel in an integrated iron and steel works is the production of DRI utilizing coke oven gas as reducing agent. The DRI produced can be used in the blast furnace, in the converter, or in the electric arc furnace. The potentials described in this paper for an optional utilization of coke oven gas are subject to a technical and economical assessment prior to implementation by taking into account the local and operational requirements of the steel works.

Main function of a coking plant is to supply blast furnaces with coke. In an integrated iron and steel works an interlinked energy network exists between the blast furnace and coking plant. From the classical coke oven raw gas treatment by-products like tar, benzole and sulphur are recovered, from which only little profit is yielded today. Thus, the profitability of construction and operation of gas treatment and by-product plants as integral part of a coking plant is not always assured. This gave rise to numerous deliberations and attempts made in the past to utilize the raw gas from the coking process for a different purpose. An economically reasonable alternative would be the so-called 2-Product Coking Plant, where – besides coke – either energy, reduction gas, hydrogen or methanol is produced, depending on the coke oven raw gas treatment. The technology of coke oven gas injection into the blast furnace has already been proven in practice. Another interesting alternative for the production of hot metal and crude steel in an integrated iron and steel works is the production of DRI utilizing coke oven gas as reducing agent. The DRI produced can be used in the blast furnace, in the converter, or in the electric arc furnace. The potentials described in this paper for an optional utilization of coke oven gas are subject to a technical and economical assessment prior to implementation by taking into account the local and operational requirements of the steel works.

Keywords

coke oven gas, 2-component coking plant, DRI, energy recovery

coke oven gas, 2-component coking plant, DRI, energy recovery