HK-H17 - March 8th, 2007

Notes

• Very small maple - simulation of ASTM crib (see HK-H13) . 19% moisture (estimated). 47.5 lbs 
• 12 pieces, stacked 3333. Right side ignition.
• Previous fire: 24 hours.
• An attempt to simulate the ASTM crib with hardwood cordwood, by using smaller fuel
• Repeat of HK-H16, with ashbox door open (more air). (8.5 lbs more wood)
• Hardwood kindling (instead of standard softwood), sluggish start for first 5 minutes, apparent on all the curves.

Animation

2 minute intervals. 43 frames (86 minutes)

Flue Gas

Flue gas analysis

• Higher temp peak than HK-H16
• Characteristic CO hump in the middle, present in all crib burns so far, and absent in regular cordwood runs.
• Interestingly, there was a minimum in the CO/CO2 ratio just before the hump, that coincided with the first peak (spike) in
  the opacity hump (below).
• One could postulate that when bad burn conditions are imminent in the evolution of this type of batch burn, with high
  surface to volume ratio for a given fuel loading, the PM will show it earlier than the CO. (see below).

Opacity

Same signature to opacity curve, but much lower with the extra air. See small spike at beginning from "hiccup" start. 
Load was about 8 lb more for the same number of pieces, ie, larger pieces. This would tend to reduce the opacity
spike, as very probably does the extra air.

Fuel stack

Resources

• Excel Data File: testoH-17.xls
• Fueling Excel Data File: fueling-07-HK17.xls