| 1. |
- Hahlin, Pär, et al.
(författare)
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Raceway depth measurements in the blast furnace using microwave technology
- 2006
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Ingår i: 4th International Congress on the Science and Technology of Ironmarking, ICSTI 2006, Proceedings. ; , s. 504-507
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Konferensbidrag (refereegranskat)abstract
- Attempts to control the raceway depth have been made with many different technologies however none of them have had the capability to measure during operation. By using microwave technology the problem with interfering obstacles such as the coal injection can be avoided since the technology is not susceptible to this kind of interference. In this paper a novel approach using microwave technology to measure the raceway variations during operation will be described. MEFOS, The Metallurgical Research Institute AB, Lulea, Sweden, has tested an especially developed microwave unit to continuously measure the variations of the raceway during operation in the Blast Furnace. The trials were performed as a single tuyère trial on Blast Furnace 3 at SSAB Tunnplat AB, Lulea, Sweden with excellent results.
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| 2. |
- Malmberg, Donald, et al.
(författare)
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Microwave Technology in Steel and Metal Industry, an Overview
- 2007
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Ingår i: ISIJ International. - Tokyo : Nippon Tekko Kyokai. - 0915-1559 .- 1347-5460. ; 47:4, s. 533-538
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Tidskriftsartikel (refereegranskat)abstract
- In many metallurgical operations, effective analysis of the processes can be very difficult with available technology. This is especially true if the analysis is to be performed on-line and in a harsh environment characterized by high temperatures, dust and liquid metal. Protection of the equipment requires both rugged encapsulation as well as elaborate sampling systems and exposure of the equipment to the hazardous environment must be minimised. Often this result in an increased level of service and maintenance requirements and, in the worst case, the maintenance cost might be so high that the equipment is not installed. Microwave technology is a versatile and powerful tool with many different applications in the scientific community. It is insensitive to dust and fume and, for several years, the technology has been tested at MEFOS and evaluated for different metallurgical processes. It has been applied to slag thickness measurement and slag composition in an induction furnace, 3D imaging of the burden surface in a charging model on pilot scale as well as raceway depth measurements in a Blast Furnace. The idea of using microwave technology for gas analysis in metallurgical processes has also been explored. However, despite its many advantages, microwave technology is still not employed extensively in the steel and metal industries. Copyright © 2007 ISIJ.
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| 3. |
- Malmberg, Donald, et al.
(författare)
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Preliminary microwave measurements on liquid stags
- 2005
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Ingår i: Ironmaking & steelmaking. - London : Maney Publishing. - 0301-9233 .- 1743-2812. ; 32:1, s. 61-67
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Tidskriftsartikel (refereegranskat)abstract
- Microwave technology has for decades been a tool for astronomers in their work to map and understand the complexities of the universe in terms of composition and extent but it is also used at laboratory scale by spectroscopists to examine the properties of atomic and molecular compounds. This paper discusses the use of microwave technology for the investigation of liquid slag structures. Preliminary results indicate that alteration of slag composition could be correlated to the measured microwave refractive index. Investigations have been performed on Al2 O3 -CaO-SiO2.
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| 4. |
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| 5. |
- Nilsson, Emil, 1972-, et al.
(författare)
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Blast Furnace Burden Topography
- 2007
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Ingår i: Proceedings Conference on Mets & Props, 2007. ; , s. 1-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Within the global steel-and metal industry there is a growing need for new sensor systems to measure and control the industrial process. New technologies for new sensors are continuously being developed for an ever growing market. The growth in the steel making industry is based on ore and Blast Furnaces therefore play an increasingly important role for the production of hot liquid iron and steel. We present a new interferometer micro wave system to makethree dimensional topographic maps of the blast furnace burden surface. The Blast Furnace process is one of the oldest industrial processes. The furnace is tall and round. Layers of Coke ands iron ore are successively laid, and air, pre-heated to 1200 °C, as fuel to the process. The coke and iron layers become semi-liquid and then liquid in the cohesive zone. The carbon from the coke reacts with the oxygen in the ore (which is Fe2O3or Fe3O4) and form CO and CO2which goes off as off-gas. The iron, now mixed with some amount of carbon, is tapped in liquid form from the bottom. This is then taken to a converter, where oxygen is added to remove the carbon to form the final product of liquid steel.
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| 6. |
- Nilsson, Emil, et al.
(författare)
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Using microwave interferometry to improve the blast furnace operation
- 2008
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Ingår i: SCANMET III. - Luleå : MEFOS. - 9789163322693 - 9789163322709 ; , s. 617-626
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Konferensbidrag (refereegranskat)abstract
- There are many known technologies that can be used to monitor surfaces, but the most of them requires a transparent environment to be functional. In the Blast Furnace where the environment is full of dust and fume at high temperatures those technologies are not applicable.With a functional technology in such an environment the burden surface could be analysed and monitored, which in its extension would lead to a way to control the charging operation in the BF and thus a better use of raw material and also a better gas utilization.In this paper we will discuss the use of microwave technology as one technology with the potential to create a topographical image of the burden surface in the Blast Furnace during operation.
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