Method and system for the torrefaction of lignocellulosic material
Inactive Publication Date: 2013-03-28
ECN ENERGY RES CENT OF THE NETHERLANDS +1
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Benefits of technology
This patent describes a process for heating and cooling biomass material using a continuous flow of gas. The gas is heated and then introduced into the biomass material to heat it up. The gas also cools the material as it comes out of the torrefaction reaction. The process helps regulate the temperature of the material and prevents over-reaction of the torrefaction reaction. It also reduces the formation of tar-like deposits on surfaces and assists in maintaining high internal surface temperatures. The process uses a heated tray and insulation to minimize energy loss. The technical effects of this process are improved efficiency and control over the torrefaction process for biomass materials.
Problems solved by technology
If the material overheats, the torrefaction reaction may over-react.
Method used
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[0050]FIGS. 1 to 4 illustrate an embodiment of a pressurized treatment vessel 10 for receiving, drying, treating by torrefaction, 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. The biomass is dried, subjected to a torrefaction process and cooled to produce torrefied biomass.
[0051]The biomass may be fully or partially dried in an external dryer 15 before entering the vessel. After passing through the upper inlet, the biomass enters an upper tray in a stack 16 of trays. The trays provide a cascade of moving beds to dry and treat the biomass. The upper trays may be used to dry the biomass. Lower trays may be used to subject the biomass to a torrefaction treatment. An insulating tray may divide the drying trays from each other and the torrefaction trays.
[0052]The upper inlet 14 to the pressurized vessel may be coupled to a continuous feed, pressure isolation device, suc...
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A method for torrefaction of biomass using a torrefaction reactor vessel having stacked trays including: feeding the biomass to an upper inlet of the vessel; 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; heating the biomass material with an oxygen deprived gas; extracting moisture from below each of the upper trays; as the biomass undergoes torrefaction in the lower trays retaining the gas with the biomass until the biomass falls from the stacked trays to a pile of biomass in the reactor vessel; exhausting gases containing organic compounds through a gas outlet at an elevation between the stacked trays and the pile of biomass, and discharging torrefied biomass from the torrefaction reactor vessel.
Description
RELATED APPLICATION[0001]This application claims priority to U.S. Provisional Patent Application Ser. No. 61 / 537,413 filed on Sep. 21, 2011 and 61 / 551,932 filed Oct. 27, 2011, respectively, the entirety of which are incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention generally relates to systems and methods for torrefaction of biomass material, such as wood, other lignocellulosic material, and biomass containing fossil based materials such as plastic fractions and refuse-derived fuel (RDF) (these materials are collectively referred to as “biomass material”). The invention more particularly relates to a pressurized reactor vessel for the torrefaction of biomass material.[0003]Torrefaction refers to the thermal treatment of biomass, usually in an oxygen deprived atmosphere at relatively low temperatures of 200 degrees Celsius (° C.) to 400° C., or 200° C. to 350° C., temperatures outside the range used for the process known as pyrolysis. An oxygen deprived...
Claims
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Login to View More IPC IPC(8): C10B21/02
CPCC10L5/44Y02E50/15Y02E50/10Y02E50/30C10B21/02C10L9/083
Inventor EYER, ANDREWSTROMBERG, BERTILGREENWOOD, BRIAN F.KIEL, JACOB HENDRIK ARNOLDZWART, ROBIN WILLEM RUDOLFVERHOEFF, FERDINANDSESTRICH, MICHAELNANDY, NACHIKETADIAZ, ROBERTMIELE, JAY
Owner ECN ENERGY RES CENT OF THE NETHERLANDS