HK-J07 - January 15th, 2008

Notes

• White birch, large pieces, 21% moisture, large load 79.1 lbs
• 8 pieces, 4.5 lbs kindling
• Cold fuel, stacked in warm firebox for 90 minutes. Warm heater (24 hrs)
• 0.9 g/kg PM (Condar)
• 26.0 g/kg CO
• 74.7 % overall efficiency

Animation

Flue Gas

Flue gas analysis

Somewhat slow start. Kindling was stacked a little tight, so fire tunnelled through the newspaper to the back right away. Ashbox door was accidentally left closed with 50% air, AB door opened at 12 minutes.

Ashbox door was closed at 32 minutes. (air control full open), evidenced by stack temperature (red curve) drop. Also a huge, short, CO (yellow curve) spike.

Bells were closed to start, opened at 40 minutes. They add about 2% in efficiency. If the bells were openend permanently, stack would take longer to get up to temperature - it is unclear at this point whether that would increase emissions on the start, and needs further investigation.

Big dip in oxygen (blue) curve at 90 minutes is when fuel pile collapses.

Opacity

The spike at 32 minutes is when air is cut back (ashbox door closed). With a very large fuel load such as this, it may be advantageous to delay closing the door to 350F.

Statistics

Fuel stack

Resources

• Excel Data File: testoJ-07.xls
  
• Condar Spreadsheet + Fueling Excel Data File: Condar-HKJ-07.xls