Devices and methods for discharging pretreated biomass from...

C - Chemistry – Metallurgy – 10 – L

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C10L 5/44 (2006.01) C10L 1/32 (2006.01)

Patent

CA 2726443

Provided are devices and methods for discharging pretreated biomass from a pressurized reactor. Pretreated, hot biomass is added under high pressure at the top of a discharge vessel, which is partially filled with water or aqueous solution. The vessel comprises water jets situated on its sides through which water or aqueous solution is injected in order to establish a strong turbulence in the lower part of the vessel. This turbulence, preferably a vortex turbulence or "hydrocyclone," blends biomass and water and disintegrates any clumped material prior to its ejection at high speed as a slurry through an orifice or valve at the bottom of the vessel. A stable temperature stratification is established within the discharge vessel, whereby hot water remains at the top of the vessel, reducing heat and steam loss from the pretreatment reactor.

Linvention concerne des dispositifs et des procédés de décharge de biomasse prétraitée dun réacteur pressurisé. De la biomasse chaude prétraitée est ajoutée à haute pression dans la partie supérieure dune cuve de décharge partiellement remplie deau ou dune solution aqueuse. Cette cuve est pourvue de jets deau situés sur ses côtés, à travers lesquels leau ou la solution aqueuse est injectée pour créer une forte turbulence dans la partie inférieure de la cuve. Cette turbulence, de préférence un tourbillon ou "hydrocyclone", mélange la biomasse et leau et désintègre les matières agglutinées avant de les éjecter à haute vitesse sous la forme dune bouillie par un orifice ou une vanne situé(e) dans la partie inférieure de la cuve. Une stratification de températures stables est créée à lintérieur de la cuve de décharge, leau chaude demeurant dans la partie supérieure de la cuve, ce qui réduit la perte de chaleur et de vapeur du réacteur de prétraitement.

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