Low CO2 emission technologies for iron and steelmaking as well as titania slag production |
| |
| Affiliation: | 1. Ausmelt Ltd, Australia;2. Helsinki University of Technology, Finland;1. Fraunhofer Institute for Systems and Innovation Research (ISI), Breslauer Str. 48, 76139 Karlsruhe, Germany;2. Copernicus Institute of Sustainable Development, Utrecht University, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands;1. Process Metallurgy Research Group, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland;2. Thule Institute, NorTech Oulu, University of Oulu, P.O. Box 7300, 90014 Oulu, Finland;1. Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland;2. Energy Engineering, Division of Energy Science, Luleå University of Technology, SE-97187 Luleå, Sweden;3. Swerea MEFOS, Process Integration Department, Box 812, SE-97125 Luleå, Sweden;4. Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland;5. Future Eco North Sweden AB, Gjutvägen 9, SE-96138 Boden, Sweden |
| |
| Abstract: | The world wide discussion on climate change caused by CO2 and other greenhouse gases (GHGs) attributable to human activities has put the focus on the energy intensive production technologies for iron and steelmaking. Taking into account the enormous production increase for these versatile materials in the last years, modern technologies with lower CO2 and GHGs emissions are imperative to keep at least today’s status, though a decrease is challenged.Outokumpu Technology has developed direct reduction technologies that allow in combination with smelting reduction processes or electric arc furnaces a substantial lowering of CO2 emissions.In the presented contribution to MMME 06 three examples will be given:The Circofer® process, already demonstrated in pilot plant scale, uses coal as reductant in a two stage CFB (circulating fluidized bed)/FB (fluidized bed) reactor configuration to obtain a highly metallized product suitable for charging into smelting processes.One possible application of Circofer is, in a single stage configuration, as prereduction unit in combination with HIsmelt®, a smelting reduction technology to produce hot metal using iron ore and coal fines. Using Circofer as prereduction step, the capacity of a given HIsmelt installation can be increased by the factor three to four compared to cold feed and CO2 emission can be lowered to values about 20% below the standard of a modern blast furnace, as this combination of technologies requires no agglomeration plant or coke ovens.A second application of Circofer is the combination with an electric arc furnace (EAF) to produce steel directly from direct reduced iron (DRI). The direct charging of metallic fines into an EAF was successfully tested, observing no increased dust emission from the furnace. Charging hot DRI into an EAF decreases drastically electric power consumption and thus further lowers CO2 emission.Applying Circosmelt, the combination of a single stage Circofer system with an electric reduction furnace for ilmenite processing, only half of the electric power consumption required today for titania slag production using cold, unreduced feed material is required.A common additional advantage of all Circofer based routes is that a 99% pure CO2 stream is removed for process reasons from the process gas and can be used for enhanced crude oil production or sequestration methods.The paper will report on the status of the different developments and its market introduction.Outokumpu Technology GmbH (formerly Lurgi Metallurgie) has been involved in the development, design and supply of plants for processing iron bearing ores in fluidized bed reactor systems for more than 30 years. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
