Saarstahl and Dillinger cooperate with Paul Wurth, a company of SMS group, to further develop the technology of dry reforming of coke oven gas with blast furnace gas developed by Paul Wurth. A cooperation agreement to this effect was signed in 2020. The pilot plant is to be taken into operation in the summer at the site of the joint subsidiary of Dillinger and Saarstahl, ROGESA Roheisengesellschaft Saar mbH, in Dillingen.

The dry reforming process allows the conversion of coke oven gas into a hot reducing gas or syngas that is injected in the blast furnace at tuyere or shaft level. The mixture of coke oven gas and blast furnace gas is compressed and heated-up in a regenerative heat exchanger of similar design than a traditional hot stove. At high temperature, the methane contained in the coke oven gas will react with the CO₂ contained in the blast furnace gas to produce hydrogen and carbon monoxide.

The injection of this hot reducing gas into the blast furnace entails a significant reduction in coke consumption. Such use of steelmaking gases for metallurgical purposes rather than for thermal purposes, translates into a significant reduction in CO₂ emissions of up to 12%. The use of hydrogen can further improve and almost double the CO₂ saving potential.

The first step in the development of the dry reforming technology is the construction of a pilot plant, which allows testing the dry reforming process at small scale with industrial gases. A further objective of the pilot plant is to test materials and components in regards to their suitability for the construction of an industrial scale plant. This is particularly important for the selection of refractory materials used in the regenerative heat exchanger. The start-up of the pilot plant is scheduled for summer 2021.

In the subsequent phases of the cooperation, it is planned to scaled-up the process to semi-industrial and later industrial scale with the support of public funding, by producing larger amounts of hot syngas and inject them at shaft level in one of the two blast furnaces in Dillingen. Elaboration of a blast furnace shaft injection technology is thus part of the dry reforming development.

The cooperation agreement provides Paul Wurth the opportunity to test the dry reforming process under industrial-like conditions, which will boost the development of the new technology. For Dillinger and Saarstahl, the future full-scale implementation of this technology will considerably decrease the carbon footprint and allow taking a next step forward towards green steel production.

About Paul Wurth

Headquartered in Luxembourg since its creation in 1870, the Paul Wurth Group can look back on 150 years of excellence, during which the firm has developed into an international engineering company and an established technology provider for the global ironmaking industry. As a company of SMS group, Paul Wurth is a leading market player for the design and construction of complete blast furnace and coke oven plants. Direct reduction plants, environmental protection solutions and recycling technologies complete Paul Wurth’s product portfolio. Presently, the company is focusing on the development of innovative solutions for leading the transformation of the steel industry towards carbon-free steel production.

PAUL WURTH S.A.
32, rue d’Alsace
P.O. Box 2233
L-1022 Luxembourg
Tel.: (+352) 4970-1
paulwurth@paulwurth.com
www.paulwurth.com.

About Dillinger and Saarstahl

Dillinger is a world leader in the manufacture of steel heavy plate for the steel construction, machine manufacturing, offshore, offshore wind power and line pipe sectors. Saarstahl is a world leader in the manufacture of wire rod and bar steel for the automotive industry, the construction industry and for general machine manufacturing. Dillinger and Saarstahl belong to SHS – Stahl-Holding-Saar. More information can be found at www.dillinger.de or www.saarstahl.de.

About SMS group