Limestone Oxidation and Mixing was the Hot Topic on June 11, 2009
Converting calcium sulfite to the calcium sulfate in suspension requires a combination of mixing and air injection. If the limestone size is reduced by dry means, a mixer is necessary to introduce it into the slurry. These two topics were the focus of the lively discussion yesterday.
Bob Dowd, General Manager, Clean Air Division, Philadelphia Mixing Solutions Limited, discussed mixing of slurries prior to injection. Agitation in an absorber tower is generally responsible for keeping solids from settling on the bottom of the tank and effectively dispersing air into the system to promote oxidation of the calcium sulfite to form calcium sulfate (gypsum). Methods of air injection to improve efficiency of oxidation are important and effect energy consumption.
In addition to the basic power points, Bob provided short movies of the action. These are available in the linked power points but were not able to be viewed by the internet audience.
Jim Ward, Industrial and Vacuum Sales Manager-Americas for Gardner Denver’s Centrifugal Products Operation, discussed parameters affecting the selection of compressors/blowers as well as the differences in capital, maintenance and operating costs between multistage and single stage technologies. Multistage compressors offer both capital and operating advantages.
Charles Alack of Semi-Bulk Systems discussed mixing of ground limestone which is delivered in bulk rather than ground in a ball mill. The mixer uses the jet venturi principle to suck the ground material into the liquid stream. The result is a compact efficient way to introduce the powered limestone into a slurry system. A number of systems using this principle have recently been purchased.
The bios, abstracts and photos can be viewed as follows: June 11, 2009 - Bios, Photos, Abstracts.htm
The individual slides are in the FGD Decision Tree and can be viewed as follows:
Bob Dowd – Philadelphia Mixing Solutions Limited
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FGD Continuing Decision Process For: Products
FGD Agitation, presented by Bob Dowd. Hot Topic Hour June 11, 2009.
http://www.mcilvainecompany.com/FGD_Decision_Tree/subscriber/Tree/DescriptionTextLinks/pm6-11-09.pdf
Power Point version including Movie
Jim Ward – Gardner Denver
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FGD Continuing Decision Process For: Products
Power Generation Overview, presented by Jim Ward. Hot Topic Hour June 11, 2009.
Charlie Alack - Semi-Bulk Systems
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FGD Continuing Decision Process For: Products
Power Plants – FGD Limestone Slurry Processes