Method and system for the torrefaction of lignocellulosic material

a technology of lignocellulosic material and torrefaction method, which is applied in the direction of indirect heat exchangers, lighting and heating apparatus, solid fuels, etc., can solve the problems of low gas mass at atmospheric pressure, unpressurized reaction vessels, etc., and achieve the effect of increasing the mass and speeding up the heating of biomass

Inactive Publication Date: 2012-02-23
ANDRITZ TECH & ASSET MANAGEMENT
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A difficulty with unpressurized reaction vessels is the low mass of gas at atmospheric pressure.
Further, pressurized reaction vessels require pressurized gases and conduits for the pressurized gases.

Method used

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  • Method and system for the torrefaction of lignocellulosic material
  • Method and system for the torrefaction of lignocellulosic material
  • Method and system for the torrefaction of lignocellulosic material

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Embodiment Construction

[0019]FIG. 1 is schematic diagram of a pressurized treatment vessel 10 for receiving, from a storage bin 12, biomass material, such as wood chips, wood pulp and other comminuted cellulosic material. The biomass enters the pressurized treatment vessel through an upper inlet 14. The upper inlet may be a high pressure transfer device that allows biomass at atmospheric pressure to be transferred into the high pressure vessel. Alternatively, the biomass may be pressurized by a high pressure feeder (HPF) or a series of chip pumps 22 as the pressurized biomass flows through a conduit 23 to the upper inlet which may be an open valve.

[0020]Within the vessel, the biomass is subjected to a torrefaction reaction and is discharged as torrefied biomass 14 from a lower discharge outlet 16 of the vessel. Before the torrefaction reaction occurs in the vessel, the biomass may be dried and heated in an inert environment to a temperature of 200° C. to 400° C. The biomass may be dried and heated in a se...

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Abstract

A method for torrefaction of lignocellulosic biomass using a torrefaction reactor vessel having stacked trays, the method including: continuously feeding the biomass to an upper inlet of the torrefaction reactor vessel such that the biomass material is deposited on an upper tray of a plurality of trays stacked vertically within the reactor; as the biomass moves across an upper surface of each of the trays, heating and drying the biomass material with a gas injected into the vessel, wherein the gas is substantially non-oxidizing of the biomass, is under a pressure of at least 20 bar gauge and at a temperature of at least 200° C.; cascading the biomass down through the trays by passing the biomass through an opening in each of the trays to deposit the biomass on a lower tray; discharging torrefied biomass from a lower outlet of the torrefaction reactor vessel, and circulating gas extracted from a lower elevation of the reactor vessel to an upper region of the reactor vessel.

Description

CROSS RELATED APPLICATION[0001]The application claims priority to U.S. Ser. No. 61 / 374,412 filed on Aug. 17, 2010 which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The present invention generally relates to systems and methods for torrefaction of lignocellulosic material, such as 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 moisture and low weight organic volatile components from wood. Torrefaction may also depolymerize the long polysaccharide chains of the hemicellulose portion of biomass and produce a hydrophobic solid combustible fuel product with an increased energy density (on a mass basis) and improved grindability. Torrefaction changes ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L5/44F28D21/00
CPCC10L5/44C10L9/083Y02E50/15Y02E50/10Y02E50/30
Inventor RAWLS, JOSEPHSTROMBERG, BERTILWESTON, JOHNJIANG, XIAOPINGHUNT, TYSON
Owner ANDRITZ TECH & ASSET MANAGEMENT
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