High Temperature Drying of Chips

A direct-fired, drum-type dryer is most commonly used to dry wood flakes, shavings, and chips. The hot gases, of about 1800?F., pass directly into the drum at about 4000 fpm under wood moisture conditions of 70 percent or higher (wet basis). The lowest air velocity in the dryer is about 1000 fpm. With wood at 40-50 percent MC, the inlet gas temperature will between 700-1200?F., and the outlet temperature will be 220- 270?F. for flakes and shavings and 350-400?F. for pulp chips. The temperature of the dried wood leaving the drier does not exceed 130-140?F. One gallon of oil will dry 190 pounds of wood from 50 percent MC to 6 percent. Since bulk density of particles will range from 3-18 lbs./cu.ft. at 6 percent MC, special attention must be given to the air-handling system.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member