Fluid bed hog fuel dryer

Patent · Tue Dec 16 04:00:00 EST 1986

OSTI ID:6928146

O'Hagan, M A; Smith, R D

A fluidized bed dryer is described for drying wet wood waste of varying particle size without overdrying fines portions of the wastes and causing significant amounts of organic volatiles to distill therefrom, the dryer comprising: a vessel having a porous floor through which an upward flowing gas passes fluidizing the wood waste to be dried, the floor dividing the vessel into upper and lower plenums; baffle means for dividing the upper plenum adjacent the porous floor into a plurality of substantially horizontally adjacent drying zones for the wet wood waste. The baffles cause the coarsest portion of the wood waste in each zone to travel a circuitous path as it proceeds substantially horizontally through the dryer; a means for feeding wet wood waste into a first drying zone in the upper plenum; a first discharge means for collecting the fines portions of the dried wood waste entrained in the fluidizing gas, from the upper plenum, and for separating the dried wood fines from the gas for discharge from the vessel; a second discharge means for discharging the dried coarsest portion from the upper plenum last drying zone from the vessel; and a sealing means for dividing the lower plenum into compartments wherein the fluidizing gas introduced into each compartment fluidizes the wood waste in the upper plenum drying zones coincident with the compartment. The gas in each compartment has just sufficient velocity to entrain the finest portion of the wood waste in each of the zones and discharge the wood waste fines from the vessel through the first discharge means just as the wood fines achieves a desired level of dryness.

• Assignee: Garrett Corp., Los Angeles, CA
• Patent Number(s): US 4628833
• OSTI ID: 6928146
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090400* -- Solid Waste & Wood Fuels-- (-1989)
140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)
BAFFLES
CONTAINERS
CONTROL EQUIPMENT
DISTILLATION
DRYERS
DRYING
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUIDIZED BEDS
GAS FLOW
MATTER
MOISTURE
PARTICLE SIZE
POROSITY
SEALS
SEPARATION PROCESSES
SIZE
SOLID WASTES
VOLATILE MATTER
WASTES
WOOD WASTES