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Method of Drying Biomass

a technology of biomass and drying method, which is applied in the direction of biofuels, waste based fuels, fuels, etc., can solve the problems of increasing the transportation cost of materials and not addressing product cooling, and achieve the effect of enhancing the distribution of water added

Inactive Publication Date: 2011-10-20
RIVER BASIN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biomass often contains about 10 to about 50 weight percent moisture, which does not add to the fuel value and increases the transportation cost of the material.
In addition, the '978 patent discloses a torrefaction residence time of 0.5 to 5.0 hours and does not disclose a specific cooling methodology.
The '331 application discloses combustion of vapors produced during torrefaction to supply the heat for torrefaction and the subsequent pelletizing of the torrefied product, but does not address product cooling.

Method used

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Examples

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Embodiment Construction

[0054]Referring now to FIG. 1, a biomass torrefaction system 2 implements a process for preparing torrefied biomass. More specifically, one embodiment of the present invention employs a fluidized bed reactor 6 wherein a fluid or gas is passed through a granular solid biomass material at high velocities to suspend the solid and cause it to behave as if it were fluid (i.e. fluidization). The biomass may be wood that has been reduced in size by a commercially available wood chipper. The size of the biomass will vary, but the smallest dimension is typically about 3 mm to 10 mm thick. One of skill in the art will appreciate that straw or other agricultural waste may be used without departing from the scope of the invention. In one embodiment, biomass having about 10 to 50 weight percent moisture is processed The weight percentage is, preferably, determined by conventional methods in accordance with standard A.S.T.M. testing procedures.

[0055]The biomass torrefaction system 2 receiving fee...

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Abstract

A process for torrefaction of biomass is provided in which biomass are passed into a fluidized bed reactor and heated to a predetermined temperature in an oxidizing environment. The dried biomass is then fed to a cooler where the temperature of the product is reduced to approximately 100 degrees Fahrenheit.

Description

FIELD OF THE INVENTION[0001]Embodiments of the present invention relate to a process for preparation of a solid fuel biomass by torrefaction. More specifically, in the process of one embodiment, the biomass material is heated directly in an oxidizing atmosphere while a portion of the processed biomass is used as fuel to produce heat required to support the torrefaction process.BACKGROUND OF THE INVENTION[0002]“Biomass” refers to renewable organic materials such as wood, plant materials or agricultural waste. Biomass often contains about 10 to about 50 weight percent moisture, which does not add to the fuel value and increases the transportation cost of the material. “Torrefaction” refers to the treatment of biomass at a temperature between about 200° C. to about 350° C. wherein water and volatile carbon molecules are vaporized. In addition, during the torrefaction process, molecules of hemicelluloses contained in the biomass decompose into smaller, less complex carbon molecules, som...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L5/44C10L5/40
CPCC10L5/442C10L5/445Y02E50/30Y02E50/10Y02E50/15C10L9/083
Inventor CAMPER, CLINTON B.SETHI, VIJAY
Owner RIVER BASIN ENERGY
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