Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

More Flexibility for Steel Production

27.01.2014
Siemens enables steel mills to adapt their production processes more flexibly to raw material prices and emission regulations.

The newly developed JET Process provides sufficient heat energy to melt a high proportion of scrap and sponge iron into liquid pig iron. As a result, steel producers can more easily take advantage of low prices for these materials.



And because producing pig iron in a blast furnace creates especially large amounts of carbon dioxide, this new process also reduces CO2 emissions. This JET technology is already operating successfully in a steel mill in Asia.

The JET process uses a bottom-blowing converter. Such converters contain melted pig iron, scrap, and sponge iron. By blowing oxygen into this molten mass from below, these materials are processed into steel. Lime or other materials are introduced to promote the formation of slag. The amount of scrap and sponge iron in bottom-blowing converters may not exceed one fifth of the amount of pig iron. If this proportion were any larger, the scrap and sponge iron would no longer melt into the molten mass.

However, by injecting additional coal into the bottom of the converter, the JET process provides enough heat to enable a larger proportion of scrap and sponge iron to be added to the mixture. To achieve this result, a hot air lance blasts oxygen-enriched air at a temperature of around 1,300 °C onto the steel bath from above.

This hot blast travels at close to the speed of sound. It mixes the molten mass so completely that almost all of the carbon monoxide escaping from the bath reacts with the oxygen in the hot air blast, forming CO2 and heating the liquid steel. Additionally, coal is blown in from below, where it is used as fuel. This injection of coal is carefully controlled. The combination of a targeted introduction of coal and the hot air lance creates so much heat energy that the converter can be operated using only scrap and sponge iron. Moreover, due to their design, the oxygen jets located at the bottom of the converter slice through the scrap like cutting torches. As a result, the converter can be loaded with very large pieces of scrap.

These new special converters equipped with the JET process -make steel production less dependent on the availability of pig iron and allow more flexibility in blast furnace operations. With this innovation Siemens closes the gap between conventional converters, with their limits on the proportion of scrap and sponge iron they can accommodate, and electric-arc furnaces, which can only process steel scrap. JET technology can either be installed as a new facility or retrofitted into an existing plant.

Dr. Norbert Aschenbrenner | Siemens InnovationNews
Further information:
http://www.siemens.com/innovationnews

Further reports about: CO2 CO2 emission Flexibility JET Process Production line Steel carbon monoxide heat energy

More articles from Process Engineering:

nachricht New process for cell transfection in high-throughput screening
21.03.2016 | Laser Zentrum Hannover e.V.

nachricht Sustainable products: Fraunhofer LBF investigates recycling of halogen-free flame retardant
17.02.2016 | Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Nuclear Pores Captured on Film

Using an ultra fast-scanning atomic force microscope, a team of researchers from the University of Basel has filmed “living” nuclear pore complexes at work for the first time. Nuclear pores are molecular machines that control the traffic entering or exiting the cell nucleus. In their article published in Nature Nanotechnology, the researchers explain how the passage of unwanted molecules is prevented by rapidly moving molecular “tentacles” inside the pore.

Using high-speed AFM, Roderick Lim, Argovia Professor at the Biozentrum and the Swiss Nanoscience Institute of the University of Basel, has not only directly...

Im Focus: 2+1 is Not Always 3 - In the microworld unity is not always strength

If a person pushes a broken-down car alone, there is a certain effect. If another person helps, the result is the sum of their efforts. If two micro-particles are pushing another microparticle, however, the resulting effect may not necessarily be the sum their efforts. A recent study published in Nature Communications, measured this odd effect that scientists call “many body.”

In the microscopic world, where the modern miniaturized machines at the new frontiers of technology operate, as long as we are in the presence of two...

Im Focus: Tiny microbots that can clean up water

Researchers from the Max Planck Institute Stuttgart have developed self-propelled tiny ‘microbots’ that can remove lead or organic pollution from contaminated water.

Working with colleagues in Barcelona and Singapore, Samuel Sánchez’s group used graphene oxide to make their microscale motors, which are able to adsorb lead...

Im Focus: ORNL researchers discover new state of water molecule

Neutron scattering and computational modeling have revealed unique and unexpected behavior of water molecules under extreme confinement that is unmatched by any known gas, liquid or solid states.

In a paper published in Physical Review Letters, researchers at the Department of Energy's Oak Ridge National Laboratory describe a new tunneling state of...

Im Focus: Bionic Lightweight Design researchers of the Alfred Wegener Institute at Hannover Messe 2016

Honeycomb structures as the basic building block for industrial applications presented using holo pyramid

Researchers of the Alfred Wegener Institute (AWI) will introduce their latest developments in the field of bionic lightweight design at Hannover Messe from 25...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

The “AC21 International Forum 2016” is About to Begin

27.04.2016 | Event News

Soft switching combines efficiency and improved electro-magnetic compatibility

15.04.2016 | Event News

Grid-Supportive Buildings Give Boost to Renewable Energy Integration

12.04.2016 | Event News

 
Latest News

New fabrication and thermo-optical tuning of whispering gallery microlasers

04.05.2016 | Physics and Astronomy

Introducing the disposable laser

04.05.2016 | Physics and Astronomy

A new vortex identification method for 3-D complex flow

04.05.2016 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>