Engineering Headlines

Giga fabric is designed to filter tiny dust particles from the air

Lower emissions

Where chips are planted, shavings fall, they say.

In Duisburg, however, it is more dust than steel is produced there.

Until Thyssenkrupp installed a gigantic filter system to collect all dust particles.

Where steel is produced, it needs sintering!

It is a kind of precursor of steel production, which is produced when the fine grained raw materials of iron ore and coke are caked together.

It is only as a piece of sintered cake that the raw materials enter the blast furnace.

Because this happens under enormous heat and with the use of suction air, dust unwittingly,is generated by it, which then has to be trapped again.

In ThyssenKrupp Steel Europe, Thyssenkrupp Steel Europe has now installed a gigantic cloth of around 45,000 square meters, which is intended to remove around 99% of the fine dust from the air.

For Duisburg, for the environment and for the regulatory requirements Thyssenkrupp has to fulfill.

Carsten Rokitt, builder, engineer and responsible for the sintering plant at Stahlriesen, says: “There is no larger cloth filter for the air purification process worldwide.” It is a high-tech project that is now in operation after 18 months of construction.

New filter system supplements existing electrofilters However, for the Duisburger from tomorrow there will be no more sunshine through the new filter.

Thyssenkrupp already filtered the sinter dust as well as sulfur dioxide, dioxins and furans from the air with electrofilters.

They continue to do the preliminary work, which is the first sluice through which the particles have to pass (and what many are already failing).

The remaining fine dust, however, has only been caught up to the smallest of the three bands in the Schwelgern sintering plant.

Until the giga fabric came. It relies on the same technology as the filter already installed in 2011, but it is much bigger.

The sintered dust is now sucked through more than 44,000 filter hoses, which are extremely filigree despite their length of just under 3m.

They are to clean up to 1.3 million cubic meters of exhaust air every hour. And the result?

“The air is cleaner than what a big city is breathing on the road,” says the builder.

In figures, this means that the new plant is located below the permitted limit of 10mg / m³ air with a fine dust emission value of less than 1mg / m³ air.

Dust emissions in Germany fell significantly In Germany, the steel industry has consistently reduced its dust emissions over the last decades – 87% since the reference year 1980.

In Duisburg, the impact of dust precipitation has declined so far that the limits are only exceeded separately at the Duisburg-Ruhrorter ports.

Thyssenkrupp also made its contribution to this, and around 20% less dust was emitted at the measuring time 2014 than before the filter installation in 2010.

In the next three years, the third and last fabric filter should also be installed at the sintering plant.

In other countries, however, there is still great potential. “We advise companies in Asia, especially in China, to bring the state of the art we have here in Germany,” says Wolfgang Volkhausen, Head of Immission Control in ThyssenKrupp’s steel division.

After all, industrial processes are responsible for a third of the dust emissions in some areas.


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