Pretreatment process to remove oxygen from coal en route to a coal pyolysis process as a means of improving the quality of the hydrocarbon liquid product
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United States of America Patent
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Mar 7, 2006
Grant Date -
N/A
app pub date -
Apr 9, 1997
filing date -
Apr 9, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and apparatus for coal pyrolysis pretreatment. The apparatus is made up of a pretreatment vessel for holding a bed of coal particles, a preheater for heating the bed of coal particles to a temperature below the coal pyrolysis temperature range and an oxygen remover for removing oxygen released from the heated coal particles. The apparatus can also have a flue gas source as an oxygen removal sweep gas to the bed of coal, a collector for collecting non-condensable combustible gases, and the preheater having a furnace holding ceramic balls which are circulated from the furnace to the bed of coal particles. The process involves heating the bed of coal particles to a temperature below the coal pyrolysis temperature range and preventing air from contacting the bed of coal particles in addition to collecting non-condensable combustible gases or the preheating step accomplished by having a furnace holding ceramic balls which are circulated from the furnace to the bed of coal particles.
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