The use of fine water sprays to suppress fume emissions when casting ferromanganese
During the casting of ferromanganese alloys from electric arc furnaces into sand beds at temperatures of up to 1800°C a considerable amount of very brown fumes are generated when the alloy fume is oxidized in the atmosphere. The fume is difficult to capture because of the large flux of gas that is...
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
National Association for Clean Air
2015-12-01
|
Series: | Clean Air Journal |
Subjects: | |
Online Access: | https://journals.assaf.org.za/index.php/caj/article/view/7018 |
id |
doaj-57f1946cfe5e4bbbaed3f28d1bce582c |
---|---|
record_format |
Article |
spelling |
doaj-57f1946cfe5e4bbbaed3f28d1bce582c2020-11-25T01:11:11ZengNational Association for Clean AirClean Air Journal2410-972X1017-17032015-12-0125210.17159/2410-972X/2015/v25n2a3The use of fine water sprays to suppress fume emissions when casting ferromanganeseS.J Gates0G Kornelius1S.C Rencken2N.M Fagan3P Cowx4L Els5University of Pretoria, Dept of Chemical Engineering,Environmental Engineering Group, Private Bag X20 Hatfield, Pretoria, South Africa, 0028University of Pretoria, Dept of Chemical Engineering,Environmental Engineering Group, Private Bag X20 Hatfield, Pretoria, South Africa, 0028University of Pretoria, Dept of Chemical Engineering,Environmental Engineering Group, Private Bag X20 Hatfield, Pretoria, South Africa, 0028University of Pretoria, Dept of Chemical Engineering,Environmental Engineering Group, Private Bag X20 Hatfield, Pretoria, South Africa, 0028Eramet Norway, Sauda, NorwayResonant Environmental Technologies, P.O. Box 12225, Centurion, South Africa, 0046 During the casting of ferromanganese alloys from electric arc furnaces into sand beds at temperatures of up to 1800°C a considerable amount of very brown fumes are generated when the alloy fume is oxidized in the atmosphere. The fume is difficult to capture because of the large flux of gas that is generated. Possible reasons for this flux include the high evaporation rate of Mn at elevated temperatures, the large surface area of the casting beds and the large thermal plumes over the furnace tapholes and casting beds. It has been found that the use of fine water sprays along the edge of the roof that covers the casting bed resulted in a significant reduction in visible emissions. This paper describes research into the kinetics of the fume to improve the design of the capture hoods, as well as the mechanism of suppression by the water sprays by using CFD analysis. It is shown that the oxidation reaction produces less than 20% of the energy content of the plume over the arc furnace taphole, and also that radiation heat transfer may play an important role in increasing the energy content of the taphole plume. The capture of fume particles by fine spray droplets is shown to have limited efficiency, while the heat sink that is caused by evaporation does not materially contribute to the circulation of fume through the spray. It is postulated that the increased moisture content of the air over the casting beds may be instrumental in reducing the oxygen partial pressure or in the formation of an oxide layer, both of which would reduce metal evaporation and, therefore fume formation. The exact mechanism requires further investigation https://journals.assaf.org.za/index.php/caj/article/view/7018ferromanganesesecondary fumewater spraysfume capture hoodsfume extractionferro-alloy tapping |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
S.J Gates G Kornelius S.C Rencken N.M Fagan P Cowx L Els |
spellingShingle |
S.J Gates G Kornelius S.C Rencken N.M Fagan P Cowx L Els The use of fine water sprays to suppress fume emissions when casting ferromanganese Clean Air Journal ferromanganese secondary fume water sprays fume capture hoods fume extraction ferro-alloy tapping |
author_facet |
S.J Gates G Kornelius S.C Rencken N.M Fagan P Cowx L Els |
author_sort |
S.J Gates |
title |
The use of fine water sprays to suppress fume emissions when casting ferromanganese |
title_short |
The use of fine water sprays to suppress fume emissions when casting ferromanganese |
title_full |
The use of fine water sprays to suppress fume emissions when casting ferromanganese |
title_fullStr |
The use of fine water sprays to suppress fume emissions when casting ferromanganese |
title_full_unstemmed |
The use of fine water sprays to suppress fume emissions when casting ferromanganese |
title_sort |
use of fine water sprays to suppress fume emissions when casting ferromanganese |
publisher |
National Association for Clean Air |
series |
Clean Air Journal |
issn |
2410-972X 1017-1703 |
publishDate |
2015-12-01 |
description |
During the casting of ferromanganese alloys from electric arc furnaces into sand beds at temperatures of up to 1800°C a considerable amount of very brown fumes are generated when the alloy fume is oxidized in the atmosphere. The fume is difficult to capture because of the large flux of gas that is generated. Possible reasons for this flux include the high evaporation rate of Mn at elevated temperatures, the large surface area of the casting beds and the large thermal plumes over the furnace tapholes and casting beds. It has been found that the use of fine water sprays along the edge of the roof that covers the casting bed resulted in a significant reduction in visible emissions. This paper describes research into the kinetics of the fume to improve the design of the capture hoods, as well as the mechanism of suppression by the water sprays by using CFD analysis. It is shown that the oxidation reaction produces less than 20% of the energy content of the plume over the arc furnace taphole, and also that radiation heat transfer may play an important role in increasing the energy content of the taphole plume. The capture of fume particles by fine spray droplets is shown to have limited efficiency, while the heat sink that is caused by evaporation does not materially contribute to the circulation of fume through the spray. It is postulated that the increased moisture content of the air over the casting beds may be instrumental in reducing the oxygen partial pressure or in the formation of an oxide layer, both of which would reduce metal evaporation and, therefore fume formation. The exact mechanism requires further investigation
|
topic |
ferromanganese secondary fume water sprays fume capture hoods fume extraction ferro-alloy tapping |
url |
https://journals.assaf.org.za/index.php/caj/article/view/7018 |
work_keys_str_mv |
AT sjgates theuseoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT gkornelius theuseoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT screncken theuseoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT nmfagan theuseoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT pcowx theuseoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT lels theuseoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT sjgates useoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT gkornelius useoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT screncken useoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT nmfagan useoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT pcowx useoffinewaterspraystosuppressfumeemissionswhencastingferromanganese AT lels useoffinewaterspraystosuppressfumeemissionswhencastingferromanganese |
_version_ |
1725172433391976448 |