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Coen's new iScan flame scanner performed flawlessly after installation
on a multiple burner boiler at The Center for Disease Control (CDC) in
Atlanta, GA. One iScan scanner mounted on each burner discriminated
between burner flames while scanning gas, oil and pilot flames at all
firing rates. Previously, the CDC experienced severe problems with their
old UV type flame scanners which could not discriminate between burners
and repeatedly failed in the "Flame On" position.
The boiler is a B&W water cooled wall unit producing 40,000 pounds
per hour of steam with three burners mounted one over two. The burners
fire both gas and No. 2 oil with gas firing 95% of the time. Oil firing
occurs during peak gas demand winter periods for approximately five days.
The gas pilot rating is 1.3 mmBtu/hr. Normally, all three burners fire
simultaneously and each burner can be shutdown with its own double block
and bleed valve.
Boiler Data
| Boiler size: |
40,000 LBS/hour |
| Burner Arrangement: |
1 x 2 |
| Fuel: |
Gas and No. 2 Oil |
| Igniter Type: |
Gas Electric |
| Igniter Capacity: |
1.3M Btu/hr |
| Burner Spacing: |
32 in. (horz.) |
|
9 in. (vertical) |
| Operation: |
Three burners operating simultaneously. |
Boiler Front Wall Layout
The close proximity of the burners to each other presented a special
flame scanning challenge in discriminating from adjacent burner flames
with different fuels and firing rates. The new iScan sighted the
flames during operation on main gas, main oil, pilot gas and at high and
low firing conditions. The new scanner eliminated previous discrimination
problems and enhanced safety. The iScan's simple windows based
setup procedure only took only a few hours to adjust and set.
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