Process for converting ligneous matter of vegetable origin by torrefaction, and product obtained thereby
First Claim
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1. A process for converting ligneous matter to a torrefied wood product comprising:
- (1) slowing and progressively heating a feed consisting essentially of fragmented ligneous matter in a medium which under the heating conditions is substantially inert to the ligneous matter, and wherein the heating conditions are such that all of the ligneous matter being heated reaches a temperature of at least 200°
C. but none of the ligneous matter reaches a temperature which exceeds 280°
C.(2) maintaining the said heating step for a period of 0.5 to 5 hours;
(3) removing pyroligneous gaseous products from the medium during the heating period;
(4) cooling the heated product; and
(5) recovering the resulting torrefied wood product.
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Abstract
The present invention relates to a process for converting ligneous matter of vegetable origin by torrefaction, and to the product obtained. Wood or any other ligneous matter is subjected in a neutral atmosphere to a treatment of torrefaction at a temperature of between 200° and 280° C., and preferably between 240° and 260° C. for a duration of 30 mins. to 5 hours. The product of the invention is not fermentable, it has a specific mass close to 0.25 kg/dm3, a calorific power of at least about 5000 kcal/kg, a content of fixed carbon of 35 to 40% and can be broken up by hand; it may be used as fuel in boilers and in gas generators.
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15 Claims
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1. A process for converting ligneous matter to a torrefied wood product comprising:
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(1) slowing and progressively heating a feed consisting essentially of fragmented ligneous matter in a medium which under the heating conditions is substantially inert to the ligneous matter, and wherein the heating conditions are such that all of the ligneous matter being heated reaches a temperature of at least 200°
C. but none of the ligneous matter reaches a temperature which exceeds 280°
C.(2) maintaining the said heating step for a period of 0.5 to 5 hours; (3) removing pyroligneous gaseous products from the medium during the heating period; (4) cooling the heated product; and (5) recovering the resulting torrefied wood product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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- 13. Torrefied ligneous matter of vegetable origin having a fixed carbon content of between 35 and 40%, a caloric value of at least 5000 kcal/kg A hydroscopicity of less than 3% and not being fermentable.
Specification