System for the torrefaction of lignocellulosic material

Inactive Publication Date: 2013-05-02
ANDRITZ INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A difficulty with unpressurized reaction vessels is their large size needed to handle the large volume of gas required to transfer a given amount of heat to the material to be torrefied.
The volumetric flow rate of the gas impacts the pressure drop i

Method used

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  • System for the torrefaction of lignocellulosic material
  • System for the torrefaction of lignocellulosic material
  • System for the torrefaction of lignocellulosic material

Examples

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Embodiment Construction

[0041]FIGS. 1 and 2 illustrate a pressurized treatment vessel 10 for receiving, treating, drying and cooling biomass material from a supply of biomass 12 through an upper inlet 14. The biomass may be wood chips, wood pulp or other comminuted cellulosic material. While moving over an upper series of drying tray assemblies 16 in the vessel, the biomass is dried. In addition or alternatively, the biomass may be dried prior to being introduced into the vessel 10.

[0042]The upper inlet 14 to the pressurized vessel may be coupled to a continuous feed, pressure isolation device, such as a conventional rotary valve or plug screw feeder, to feed the biomass into the pressurized vessel from a source of biomass at atmospheric pressure. The vessel 10 operates in a gas phase in which the dried biomass remains dry in the vessel.

[0043]The biomass may be fed to the inlet 14 to the vessel at a temperature of ambient temperature or, if a dryer 21 preheats the biomass, at 80° C. to 120° C., or higher, ...

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Abstract

A pressurized torrefaction reactor vessel including: a rotatable shaft extending vertically down from a top of the vessel; scraper devices each at a different elevation within the vessel and mounted to the shaft; a tray associated with each one of the scraper devices such that the scraper device is immediately above a tray of the tray assembly; wherein the tray is an open mesh and impermeable to passage of biomass through the tray; each tray includes a discharge opening to transfer biomass from the tray and down to a tray of a lower one of the tray assemblies, and wherein the discharge opening in the lowermost tray assembly transfers the biomass to a pile of the biomass in the vessel, and a bottom discharge port of the vessel through which the torrefied biomass is discharged.

Description

CROSS RELATED APPLICATION[0001]This applications claims priority to U.S. Provisional Patent Application Ser. No. 61 / 502,116 filed Jun. 28, 2011, and is related to U.S. Provisional Patent Application Ser. No. 61 / 501,900 filed on Jun. 28, 2011. The entirety of these applications are incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention generally relates to methods for torrefaction of biomass material such as lignocellulosic material including wood and other biomass, and more particularly relates to a pressurized reactor vessel for the torrefaction of such material.[0003]Torrefaction can be used to convert biomass, e.g., wood, to an efficient fuel having increased energy density relative to the input biomass. For example, wood generally contains hemicellulose, cellulose and lignin. Torrefaction removes organic volatile components from wood. Torrefaction may also depolymerize the long polysaccharide chains of the hemicellulose portion of biomass and produce a ...

Claims

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Application Information

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IPC IPC(8): C10B49/04
CPCC10L9/083C10B49/04Y02E50/14Y02E50/30Y02E50/10Y02E50/15C10B53/02C10L5/44
Inventor EYER, ANDREWSTROMBERG, BERTILRAWLS, JOSEPH MONROEGREENWOOD, BRIAN F.WESTON, JOHNSESTRICH, MICHAELNANDY, NACHIKETABOLLES, JOHNMIELE, JAY
Owner ANDRITZ INC
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