Torrefaction and partial pyrolysis of material for fuel pellet production
AssigneeDanmarks Tekniske Universitet
InventorsKim Dam-Johansen, Peter Arendt Jensen
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Abstract
The present application discloses a process for the preparation of fuel pellets, said process comprising the steps of a) subjecting a feedstock (e.g. a biomass material) to a torrefaction and partial pyrolysis step at a temperature in the range from 250° C. to 500° C., whereby a solid char and volatile fraction are obtained, said volatile fraction comprising a tar fraction; b) at least partially condensing the volatile fraction so as to obtain a tar-rich fraction, wherein the tar-rich fraction is condensed onto the solid char; and pelletization of the combined solid char/tar-rich fraction so as to obtain said fuel pellets. Novel fuel pellets are also disclosed.
Claims14
A process for the preparation of fuel pellets, said process comprising the steps of
- a. subjecting a feedstock to a torrefaction and partial pyrolysis step at a temperature in the range from 250° C. to 500° C., whereby a solid char and volatile fraction are obtained, said volatile fraction comprising a tar fraction;
- b. at least partially condensing the volatile fraction so as to obtain a tar-rich fraction, wherein the tar-rich fraction is condensed onto the solid char, whereby the solid char is combined with at least a part of the tar-rich fraction;
- and
- c. pelletization of the combined solid char/tar-rich fraction so as to obtain said fuel pellets.
4-6. (canceled)
A fuel pellet comprising a solid char, a tar, and, optionally, one or more additives, said solid char and tar being obtained by torrefaction and partial pyrolysis of a feedstock at a temperature from 250° C. to 500° C., wherein said pellet has a tensile strength of at least 100 kPa.
Dependencies are inferred from the claim text.