High pressure feeder and method of operating to feed granular or fine materials
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United States of America Patent
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Aug 9, 2016
Grant Date -
Feb 12, 2015
app pub date -
Sep 17, 2014
filing date -
Dec 21, 2009
priority date (Note) -
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Abstract
A coal feed system to feed pulverized low rank coals containing up to 25 wt % moisture to gasifiers operating up to 1000 psig pressure is described. The system includes gas distributor and collector gas permeable pipes imbedded in the lock vessel. Different methods of operation of the feed system are disclosed to minimize feed problems associated with bridging and packing of the pulverized coal. The method of maintaining the feed system and feeder device exit pressures using gas addition or extraction with the pressure control device is also described.
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