Appendix 1: Lighting and starting procedure
Sawdust at 12% moisture content was loaded into the turntable
feeder drum. With the fan and turntable feeder switched off, a small fire was
built on the furnace floor. To promote a strong fire, the fan was then switched
on to supply a low volume of air. When the fire was well alight the furnace door
was closed and the fan speed increased to an air-flow rate of approximately 8
m3/ min. This caused the flue gas temperature to rise quickly to about
600°C, then, as the fire subsided, the temperature started to drop. At this
point the turntable was switched on at a preset feedrate of about 25 kg/in.
Steady operating conditions were reached after about 10 minutes.
For all the experimental trials the unit was first run for 2-3
hours with sawdust at 12% moisture content and operating at a feed rate of 25
kg/in at an excess air value of approximately