POWER May 2013 - 21

the
torque gun
company
tm
CIRCLE 14 ON READER SERVICE CARD
We often find the excess oxygen increase from the furnace to
the economizer outlet to be more than 2% oxygen. This represents
the equivalent of about 10% of the total combustion air.
When a boiler is operated with the furnace exit as low as 2%
oxygen, the CO levels are usually extreme, into the 4,000+ ppm
range. Carbon monoxide will still burn out as the flue gases pass
through the convection pass and cool down to about 1,350F. The
result is reasonable, yet close to the limit stack CO levels even
when the furnace is starved for oxygen.
Perform Periodic Fly Ash Sampling
Periodic sampling of fly ash at the boiler exit can be very informative
about combustion efficiency. The key is to obtain representative
fly ash samples, which is easier said than done. First, don't
use electrostatic precipitator or baghouse hopper samples, which
aren't as representative as the fly ash captured directly from the
gas stream. Instead, use a fly ash sampler to sample fly ash in the
flue gas. This approach ensures that the sample reflects the true
carbon content of the fly ash that is useful to monitor pulverizer
performance. Permanent mounting of the fly ash sampler with pulley
hoists for lowering the probes and permanent compressed air
piping can make the sampling task much easier.
After the fly ash sample is collected, apply the three-part fly ash
LOI test. The first part measures the fly ash LOI collected from each
duct. Next, sieve a portion of the ash through a 200-mesh sieve
and determine the LOI of both the fine ash (passing the 200-mesh
sieve) and the coarse ash (remaining on 200-mesh sieve). The final
task is to analyze the test results. If the composite ash (fines and
coarse) is, for example, 10% LOI and the fine ash is 2% LOI, then
the problem causing the poor LOI is likely pulverizer related. If the
May 2013 | POWER
fine particles (less than 200-mesh size) have high carbon content,
then the problem is not pulverizer related but more likely is caused
by insufficient furnace oxygen or poor fuel balancing.
-Contributed by Dick Storm (richard.storm@stormeng.com),
president of Storm Technologies Inc.
Lithium-Ion Batteries:
A Potential Fire Hazard
The proliferation of battery technologies in modern industry is
presenting fire professionals with new sets of challenges. Confusion
exists as to the correct approach for protecting industrial
batteries from fire, whether that be in battery manufacturing,
battery storage, or battery-powered applications.
Lithium-ion (Li-ion) cells are distinctly different from lithium
(primary) cells and are used in large numbers in power grid stabilization
systems, containerized battery systems, and other largescale
applications. These types of systems have thousands to
tens of thousands of Li-ion cells integrated into a single space.
The uses of Li-ion cells in these applications need to be reviewed
for potential fire hazards, and fire protection strategies must be
applied and implemented to reduce the risk (Figure 4).
Potential fire protection strategies include using gaseous fire
suppression agents, such as FM-200, 3M Novec 1230 fire protection
fluid, and/or Argonite to protect large arrays of Li-ion cells.
What You Should Know About Li-ion Batteries
Li-ion batteries do not contain lithium in its metallic form. Therefore,
these batteries do not pose a Class D fire risk, as compared
with batteries that do contain metallic lithium.
Electrolytes used in Li-ion batteries are complex formulations conwww.powermag.com
21
http://www.powermag.com

POWER May 2013

Table of Contents for the Digital Edition of POWER May 2013

Contents
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POWER May 2013 - Contents
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