Systems and methods for grinding coal with secondary air bias and bowl pressure control loops and perforation plates
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United States of America Patent
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Apr 19, 2011
Grant Date -
Apr 9, 2009
app pub date -
Sep 8, 2008
filing date -
Oct 8, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A grinding system includes a mill housing. A milling unit in the housing has a moveable milling member operable to grind coal. A drive system includes a drive shaft and at least one gear in a gear case drivingly connecting the milling member to the drive shaft. An exhauster is operable to draw air into the housing through an inlet and draw a mixture of air and powdered coal out of the housing through an outlet. A pressurization system is operable to maintain the gear case pressure at a higher pressure than an air pressure in the housing. In one method of grinding coal a gear case pressure is maintained at a pressure higher than a pressure at the housing inlet while the milling member grinds coal into a powder and the exhauster draws a mixture of powdered coal and air out of the housing.
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