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
New technology for ultra-smooth polymer films
28.06.2018 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP
Diamond watch components
18.06.2018 | Schweizerischer Nationalfonds SNF
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences