DEVICE AND METHOD FOR THE DRYING AND TORREFACTION OF AT LEAST ONE CARBON-CONTAINING MATERIAL FLOW IN A MULTIPLE HEARTH FURNACE
First Claim
1. A device for drying and torrefaction of at least one carbon-containing material flow in a multiple-hearth furnace, comprisinga. a drying zone, which comprises a feed device for feeding a carbon-containing material flow, a discharge point for discharging a drying gas flow containing water vapour and an infeed point for recycling at least a part of the drying gas flow,b. a torrefaction zone for degassing the material flow dried in the drying zone, which comprises a discharge point for discharging a torrefied material flow, at least one infeed point for an exhaust gas and a discharge point for a torrefaction gas flow,c. a heat exchanger for heating the drying gas flow, the discharge point of the drying zone being connected via the heat exchanger to the infeed point of the drying zone,d. a combustion assembly, wherein the discharge point of the torrefaction zone is connected via the combustion assembly and the heat exchanger to the infeed point of the torrefaction zone,e. wherein a torrefaction gas flow discharged via the discharge point of the torrefaction zone is combusted in the combustion assembly and the resulting exhaust gas is used in the heat exchanger to heat the drying gas flow and is fed to the torrefaction zone,f. wherein the drying zone and the torrefaction zone comprise two separate gas circulations.
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Accused Products
Abstract
The device according to the invention for drying and torrefaction of at least one carbon-containing material flow in a multiple-hearth furnace substantially comprises
a drying zone, which comprises a feed device for feeding a carbon-containing material flow, a discharge point for discharging a drying gas flow containing water vapour and an infeed point for recycling at least a part of the drying gas flow,
a torrefaction zone for degassing the material flow dried in the drying zone, which comprises a discharge point for discharging a torrefied material flow, at least one infeed point for an exhaust gas and a discharge point for a torrefaction gas flow,
a heat exchanger for heating the drying gas flow, the discharge point of the drying zone being connected via the heat exchanger to the infeed point of the drying zone,
a combustion assembly, wherein the discharge point of the torrefaction zone is connected via the combustion assembly and the heat exchanger to the infeed point of the torrefaction zone,
wherein a torrefaction gas flow discharged via the discharge point of the torrefaction zone is combusted in the combustion assembly and the resulting exhaust gas is used in the heat exchanger to heat the drying gas flow and is fed to the torrefaction zone,
wherein the drying zone and the torrefaction zone comprise two separate gas circulations.
12 Citations
22 Claims
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1. A device for drying and torrefaction of at least one carbon-containing material flow in a multiple-hearth furnace, comprising
a. a drying zone, which comprises a feed device for feeding a carbon-containing material flow, a discharge point for discharging a drying gas flow containing water vapour and an infeed point for recycling at least a part of the drying gas flow, b. a torrefaction zone for degassing the material flow dried in the drying zone, which comprises a discharge point for discharging a torrefied material flow, at least one infeed point for an exhaust gas and a discharge point for a torrefaction gas flow, c. a heat exchanger for heating the drying gas flow, the discharge point of the drying zone being connected via the heat exchanger to the infeed point of the drying zone, d. a combustion assembly, wherein the discharge point of the torrefaction zone is connected via the combustion assembly and the heat exchanger to the infeed point of the torrefaction zone, e. wherein a torrefaction gas flow discharged via the discharge point of the torrefaction zone is combusted in the combustion assembly and the resulting exhaust gas is used in the heat exchanger to heat the drying gas flow and is fed to the torrefaction zone, f. wherein the drying zone and the torrefaction zone comprise two separate gas circulations.
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9. A method for drying and torrefaction of at least one carbon-containing material flow in a multiple-hearth furnace, wherein
a. the biomass is dried in a drying zone by means of a drying gas flow and is subsequently torrefied in a torrefaction zone, b. part of the drying gas flow containing water vapour is discharged from the drying zone and heated in a heat exchanger and then at least partially recycled to the drying zone, wherein c. part of a torrefaction gas flow evolving in the torrefaction zone is discharged from the torrefaction zone and fed to a combustion assembly for combustion, wherein the resulting exhaust gas is used to heat the drying gas flow in the heat exchanger and is introduced into the torrefaction zone, and d. the drying zone and the torrefaction zone are operated with two separate gas circulations.
Specification