Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Siemens Jet Process boosts flexibility of raw material use in converter steel making

27.11.2013
- Scrap or sponge iron rates between 0 and 100 percent
- Blowing in coal and post-combustion supply additional energy
- Improved mixing boosts yield and energy efficiency
- Effective decarburization and desulfurization of liquid steel

With the Jet Process, Siemens Metals Technologies offers a solution for operating converters with up to 100 percent scrap and sponge iron. This enables operators of melt shops to respond to raw material supply bottlenecks and exploit short-term price fluctuations.


The Siemens Jet Process increases the flexibility of raw material selection on the converter. Oxygen, lime and coal are blown in through bottom tuyeres and a top lance blows hot jet onto the bath. This results in excellent mixing and optimal use of the blown-in coal.

The solution consists of a bottom-blowing converter that makes it possible to blow in oxygen, lime and coal through bottom tuyeres and of a hot blast top lance for feeding additional energy into the steel bath. The Jet Process can either be implemented as a new installation or retrofitted in existing plants in a modular fashion.

Falling prices for scrap and direct reduced iron (sponge iron) as well as pressure from public authorities to reduce CO2 emissions offer stimuli for operators of integrated steel works to increase the share of scrap and sponge iron in the converter steel plant. Due to increasing price volatility, it has also become necessary to be able to flexibly adjust amounts of scrap and sponge iron to the respective market situation. A higher share of scrap or sponge iron calls for a supply of additional energy to maintain the temperature of the steel bath.

To fulfill these requirements, Siemens has developed a converter with bottom-blowing equipment and a hot blast lance. Oxygen, lime or coal can be fed into the steel bath with the aid of bottom tuyeres jets. Additionally, a top lance is used to blow a hot blast enriched to up to 40 percent of oxygen and a temperature of around 1,300 °C onto the bath. As a result of the high temperature, the speed of sound and the volume of the hot blast are high. This leads to excellent mixing, almost complete combustion of CO from the bath and optimum transfer of the heat generated in post combustion to the steel bath. A pebble heater with an energy efficiency of more than 95 percent is used to create the hot blast. Furthermore, the converter is equipped with a cooling stack to fully exploit the remaining thermal energy of the exhaust gas.

The bottom-blowing converter offers even more advantages. The oxygen bottom jets act as cutting torches, for example, enabling even large pieces of scrap to be melted with greater ease than in a conventional converter. Blowing in lime powder accelerates slag formation and desulfurization, thus improving process control. Bottom blowing also ensures a lower share of iron and iron oxide in the slag and lower slag volume in total, reducing evaporation of iron and crucially increasing the converter's yield and thus its profitability. The injected volume of coal can be varied within a wide scope. This permits easy and fast adjustment of the raw material composition to current market prices.

The Jet Process is particularly suitable for use in regions where scrap or sponge iron are relatively cheap compared to hot metal. It can also be used to circumvent bottlenecks in the availability of hot metal, either due to a planned production expansion, temporary unavailability of a blast furnace or because of production restrictions resulting from emission constraints imposed by authorities. The Jet Process has been successfully in operation at an Asian steel works since mid-2013.

Bottom-blowing converters with hot blast technology are part of the Siemens portfolio for special converters, offering steel producers greater flexibility in the use of raw materials, in particular if rates of scrap or sponge iron are high. Shares of up to 100 percent can be processed with these converters, much more than in conventional LD (BOF) converters. The special converters therefore close the gap between conventional converters and the electric steel production route.

Further information about solutions for steel works, rolling mills and processing lines is available at: www.siemens.com/metals

Follow us on Twitter at: www.twitter.com/siemens_press

The Siemens Industry Sector (Erlangen, Germany) is the world's leading supplier of innovative and environmentally friendly products and solutions for industrial customers. With end-to-end automation technology and industrial software, solid vertical-market expertise, and technology-based services, the Sector enhances its customers' productivity, efficiency, and flexibility. With a global workforce of more than 100,000 employees, the Industry Sector comprises the Divisions Industry Automation, Drive Technologies and Customer Services as well as the Business Unit Metals Technologies. For more information, visit http://www.siemens.com/industry

The Metals Technologies Business Unit (Linz, Austria), part of the Siemens Industry Sector, is one of the world's leading life-cycle partners for the metals industry. The Business Unit offers a comprehensive technology, modernization, product and service portfolio as well as integrated automation and environmental solutions covering the entire life cycle of plants. For more information, visit http://www.siemens.com/metals

Reference Number: IMT201311529e

Contact
Mr. Rainer Schulze
Metals Technologies
Siemens AG
Turmstr. 44
4031 Linz
Austria
Tel: +49 (9131) 7-44544
rainer.schulze​@siemens.com

Rainer Schulze | Siemens Industry
Further information:
http://www.siemens.com

More articles from Process Engineering:

nachricht Quick, Precise, but not Cold
17.05.2017 | Fraunhofer-Institut für Lasertechnik ILT

nachricht A laser for divers
03.05.2017 | Laser Zentrum Hannover e.V.

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Fraunhofer Researchers Develop High-Pressure Sensors for Extreme Temperature

28.06.2017 | Power and Electrical Engineering

Zeolite catalysts pave the road to decentral chemical processes Confined space increases reactivity

28.06.2017 | Life Sciences

Extensive Funding for Research on Chromatin, Adrenal Gland, and Cancer Therapy

28.06.2017 | Awards Funding

VideoLinks
B2B-VideoLinks
More VideoLinks >>>