March 29, 2007
Hot Topic Hour Thursday was Agitators and Mixers
With greater use of high sulfur coals the demand for oxidation increases proportionately. There are some widely varying approaches to making fully oxidized gypsum. In a 90 minute webex conference on March 29, some of the most knowledgeable people in the agitator/mixer business provided their input.
The Hot Topic Hour was recorded. This recording will be posted for access early next week along with the other recorded Hot Topic Hours. You can view the power points directly in the FGD Decision Tree under the links provided below.
Ekato
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Jerry Baresich of Ekato indicated that the lance system is lower in cost but delivers less air than the sparger grid. He compared the sparger grid, the lance and the Ekato WINGJET O2.
Comparison of Gassing Systems
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Sparger Grid |
Lance |
WINGJET O2 |
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Cost / effort for installation |
High |
Low |
Low |
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Plugging |
Yes |
No |
No |
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Air turn down capability |
70 – 100% |
0 – 100% |
0 – 100% |
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Air rates |
High |
Lower (pluming limit) |
High |
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Liquid level |
High (> 0,5 T) |
Low (> 0,2 T) |
Low (> 0,2 T) |
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Mass transfer efficiency |
Lower |
Higher |
Higher |
The power points are in the FGD Decision tree but can be seen directly at
Philadelphia Mixing Solutions
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Bob Dowd and Wojtek Wyczalkowski of Philadelphia Mixing Solutions said that a new design in FGD oxidation air injection lance technology increases the mass transfer coefficient up to 30 percent compared with the traditional lance. In addition, the new system is very resistant to flooding due to AirWing shape and the elbow, and it is perfectly suitable for cases where high air load is required. The lance location is critical for flooding resistance and mass transfer.
There is no link yet to the power points. The file was too big to e-mail because of an included movie. We therefore ceded control of the presentation from our computer to his while he talked. This is another nice feature of webex. In any case, Bob will be sending us material to post in the Decision Tree.
Atlas Copco
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Glenn Schultz showed charts on the HA compressor which in various different models can deliver 4,000 to over 50,000 cfm. Adjustable inlet guide vanes keep energy consumption at a minimum with changes in air requirements. His power points can be viewed at