Wood chip drying system for drying wood chip and associated method for drying wood chip
AssigneeKronotec AG
InventorsJoachim Hasch, Matthias Iredi
Life of this patent
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Abstract
A wood chip drying system for drying wood chip includes a furnace, a drier for the wood chip and a recirculation apparatus for the recirculation of exhaust vapors into their drier. The recirculation apparatus has an exhaust vapor heater, and the wood chip drying system is designated to reduce organic compounds present in the exhaust vapor prior to the recirculation into the drier. The exhaust vapor heater includes a regenerative and/or catalytic heat exchanger which is arranged downstream after the drier and which is designated so as to heat up the exhaust vapor to a temperature which is high enough to oxidize at least a majority of particles present in the exhaust vapor.
Claims16
A method for drying wood chip, comprising:
- (a) conduction of flue gas from a furnace to a drier,
- (b) drying of the wood chip in the drier, so that vapor is obtained, and
- (c) recirculation of at least part of the vapor into the drier,
- wherein:
- (d) thermal reduction, in particular by oxidation, of solids present in the vapor prior to recirculation into the drier in at least one of regenerative heat exchanger.
A wood chip drying system for drying wood chip, comprising
- (a) a furnace,
- (b) a drier for the wood chip,
- (c) a recirculation device for recirculating vapors into the drier,
- (d) the recirculation device having a vapor heater, and
- (e) the wood chip drying system being designed for reduction of organic compounds present in the vapor prior to recirculation into the drier, wherein:
- (f) the vapor heater comprises a regenerative heat exchanger which
- (i) is arranged downstream of the drier, and
- (ii) is designed for heating the vapor to a temperature which is so high that solid particles present in the vapor are at least for the predominant part oxidized.
Dependencies are inferred from the claim text.