4"12-Z 1 - part - usaid

Reference
air tstrmg
Zircoma
substrate
Protection tUbe Platmum electrode
3. Protection tube (nght) of stainless steel
IS aimed at Improving probe's ability to withstand
extreme furnace conditions
greatly Improve the service life of the
high-temperature O 2 probes appeared to be
m the superheater area of the bOiler convection
pass Rather than bemg exposed to
harsh envIronmental conditions In the
open area of the furnace the probes would
have maxImum protection wlthm the secondary
pendant tubes (Fig 2).
Consequently, four 02 probes were
Installed m the secondary superlleaJer secbon
of the fumace-iWo m each SIdewall.
A potential nsk m putting them there was
they would be close to the sootblowers.
After the probes were m servICe., the sootblower
nearest each probe was opernted. It
was found that sootblower operatIon
would not damage the probes The O2 system
could now be momtored to evaluate
the performance and longevity of the
probes.
The bottom line. Imtlal tnals on Unn
7's hIgh-temperature 02 system show that
the probes have good potential for apphca-
HI-TEMP CARBON
AND OXYGEN SENSORS,
ELECTRONICS
AND ACCESSORIES.
tJon to utility bOIlers The knowledge
gamed from these tnals was put to good
advantage when a hIgh-temperature 02
system for Unit 8 was mstalled. mcludmg
four probes m the pendant reheat area of
the convection pass. After continuous
operation for over a year, none of Unlt 8's
probes have faded.
Results to date have shown differences
of O 2 measurement taken at the economizer
of 0 4% to 2.5% when compared to the
hIgh-temperature probe readmgs Probe
performance has been so successful that
the economIzer O2 system Will be phased
out at Nipsco Also, operator confidence 10
02 measurement of flue gas has been
restored Tom Elliott
• Simple, Cost Effective Technology
• Integral Thermocouples
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