Page 8
| Title | Improvement of Reducing Flame Burner with Oxygen Enrichment |
| Creator | Okada, Seiji; Suzuki, Yutaka; Kaminaka, Motofumi |
| Publisher | Digitized by J. Willard Marriott Library, University of Utah |
| Date | 1998 |
| Spatial Coverage | presented at Maui, Hawaii |
| Abstract | Recently, in the non-oxidizing furnace (NOF) of the continuous annealing process, steel sheet is heated by reducing and direct fired heating with reducing-flame burner instead of by the radiant tube heating. Firstly we investigated the reductive performance of the burner, and tried to improve the reductive efficiency with preheated and oxygen enriched combustion air. Secondly we attempted to specify the main reductive species by numerical simulation of the laminar coke oven gas (COG) pre-mixed flame. The conclusions are summarized as follows. The oxidized layer on a steel sheet of several mircrons thickness, could be reduced in ten seconds when steel sheet was heated from room temperature to 800°C in a furnace. The reducing flame burner with oxygen enriched combustion air could lead to 1200°C non-oxidizing heating in the open air. As a result of computation, the concentration of H, which is the reductive radical in the reducing flame, was increased by using high temperature flame. |
| Type | Text |
| Format | application/pdf |
| Language | eng |
| Rights | This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee. |
| Conversion Specifications | Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth. |
| Scanning Technician | Cliodhna Davis |
| ARK | ark:/87278/s6g73hcj |
| Setname | uu_afrc |
| ID | 13413 |
| Reference URL | https://collections.lib.utah.edu/ark:/87278/s6g73hcj |
Page Metadata
| Title | Page 8 |
| Format | application/pdf |
| OCR Text | 8 5. Conclusion Reducing and direct-flame burner is already being applied to the continuous annealing furnace in iron and steel works. However, the reduction mechanism is still unknown. In this report, it was proved that the air pre-heating and oxygen enrichment improve reducing ability of reduction flame in experiments. The flame temperature rises with both methods and radical species, especially H, O and O H , are increasingly generated. H, which is generated in the high flame temperature region during early to latter stages of combustion, is the predominant reductive radical species in numerical simulation. It is especially important to clarify the behavior of a radical species with steel. Mixing and combustibility of the resulting mixture were especially considered when the burner structure was designed. One problem is that Nox is generated by high local flame temperature and C O is generated by low air ratio combustion. To solve these environmental problems, further investigation is necessary. The reducing and direct-fired heating method adds the reducing function to the heating process, and is a newly developed process. In addition, basic research on the combustion reaction is necessary to develop new combustion technologies other than heating. References 1. Gotou.K, Uemura.M., Hisano,Y, Saita.H. and Kishi,K, Current Advances in Materials and Processes, 7(1994),p.461 2. Hukuda,S. and Abe,M., Kogyo Kanetsu, 23(1986)4,p.25 3. Suzuki.Y, Yabuki.K, Nojima.K., Takashima,K. and Kaminaka,M. Current Advances in Materials and Processes, 12(1989),p1577 4. Suzuki.Y, Yabuki.K, Okada.S., Takeuchi,K. and Nojima.K, Current Advances in Materials and Processes, 15(1992),p1548 5. Suzuki.Y, Yabuki.K and Okada,S., Current Advances in Materials and Processes, 15(1992),p1549 6. lshibashi,K and Tsuge.S., Tetsu-to-Hagane, 76(1990),p345 |
| Setname | uu_afrc |
| ID | 13404 |
| Reference URL | https://collections.lib.utah.edu/ark:/87278/s6g73hcj/13404 |