METHOD AND SYSTEM FOR THE TORREFACTION OF LIGNOCELLULOSIC MATERIAL
First Claim
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1. A system for the torrefaction of lignocellulosic material comprising:
- a dryer for drying lignocellulosic material adapted to remove at least of a portion of moisture contained within the lignocellulosic material;
a torrefaction reactor adapted to operate at a pressure between 1 and 50 bar and at a temperature between 100 and 1000°
C., wherein the torrefaction reactor generates torrefied biomass from the lignocellulosic material and generates torrefaction gas;
a first recycle loop adapted to recycle torrefaction gas back to the torrefaction reactor;
a cooler adapted to cool torrefied biomass, wherein the cooler is adapted to operate in a substantially oxygen-free environment;
a second recycle loop adapted to recycle inert gas to the cooler and to provide inert gas to the torrefaction reactor; and
a supply line adapted to supply inert gas for addition to the cooler;
wherein the system is adapted to use the inert gas as at least a partial medium for transferring heat among the torrefaction reactor and the cooler.
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Abstract
Systems and methods for producing torrefied lignocellulosic material in a commercially suitable process.
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Citations
20 Claims
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1. A system for the torrefaction of lignocellulosic material comprising:
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a dryer for drying lignocellulosic material adapted to remove at least of a portion of moisture contained within the lignocellulosic material; a torrefaction reactor adapted to operate at a pressure between 1 and 50 bar and at a temperature between 100 and 1000°
C., wherein the torrefaction reactor generates torrefied biomass from the lignocellulosic material and generates torrefaction gas;a first recycle loop adapted to recycle torrefaction gas back to the torrefaction reactor; a cooler adapted to cool torrefied biomass, wherein the cooler is adapted to operate in a substantially oxygen-free environment; a second recycle loop adapted to recycle inert gas to the cooler and to provide inert gas to the torrefaction reactor; and a supply line adapted to supply inert gas for addition to the cooler; wherein the system is adapted to use the inert gas as at least a partial medium for transferring heat among the torrefaction reactor and the cooler. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for the torrefaction of lignocellulosic material comprising the steps of:
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drying lignocellulosic material to remove at least a portion of moisture contained within the lignocellulosic material; reacting the dried lignocellulosic material at a pressure between 1 and 50 bar and at a temperature between 100 and 1000°
C. in a torrefaction reactor to generate torrefied biomass and torrefaction gas;recycling at least a portion of the torrefaction gas back to the torrefaction reactor; cooling the torrefied biomass in a cooler operating in a substantially oxygen-free environment; recycling inert gas to the cooler and recycling inert gas to the torrefaction reactor; supplying make-up inert gas to the cooler; wherein the method uses the inert gas as at least a partial medium for transferring heat among the torrefaction reactor and the cooler. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification