POWER December 2014 - 45

heat rate improvement
on such systems, see " Boosting Efficiency
with a Sootblowing Optimization System " in
the November 2014 issue at powermag.com.)
A lower-cost alternative is to conduct parametric
testing to provide insight into the effectiveness
of sootblowing patterns and guide
operators in achieving best unit performance.
Initiate a Routine Testing Program. A periodic
testing program should be established to
aid in early detection of changes in equipment
performance and/or unit operation to improve
maintenance scheduling efforts and reduce
unscheduled outages. By utilizing station instrumentation,
a reliable, repeatable trend of
unit performance can be developed. Guidelines
to conduct such testing are contained in EPRI
reports Routine Performance Test Guidelines
(report 1019004) and Routine Performance Test
Guidelines, Volume 2 (report 1019705).
Increase Routine Feedwater Heater
Performance Monitoring. Heater terminal
temperature difference (TTD) and drain cooler
approach (DCA) should be monitored on a
daily basis along with heater levels to maintain
optimal performance. In particular, the DCA
should be checked to ensure that steam is not
entering the drain cooler. If this occurs for an
extended period of time, the drain cooler will
be damaged, resulting in tube leaks, heaters
out of service, and higher unit heat rate.
Plant-Specific Recommendations
The following recommendations, grouped by
plant equipment/area, were specific to individual
plants.
Cycle Alignment (aligning the cycle by isolating
as much as possible of the high-energy
fluid leakage from the plant steam cycle)
■ A site-specific cycle alignment checklist
should be developed for operations use to
ensure proper continued cycle alignment.
■ Perform periodic cycle water loss tests.
Instrumentation
■ As transmitters are replaced or upgraded,
they should be replaced with high-accuracy,
" smart " transmitters.
■ Plant calibration standards should be set up
on a periodic schedule to be calibrated.
■ Set up and use an electronic database for
tracking of instrument calibrations.
■ Redundant instruments should be of sufficient
accuracy to provide the same readings.
If two instruments are measuring the same
parameter and provide different readings,
they do not provide value to operations.
Boiler
■ Utilize the plant performance calculations
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to trend boiler efficiency and individual
boiler losses so that changes in performance
can be identified quickly and action
can be taken to restore boiler efficiency.
■ Resolve coal distribution problems and
periodically inspect diffusers and riffle
distributors.
■ Review boiler optimization after a coal
distribution problem is addressed.
■ Perform unit diagnostic testing to determine
the O2
, CO, and NOx
at the economizer outlet duct where the
distribution
present in-situ O2
analyzers are located.
With some additional effort, these tests
could be used to assess the degree of air
in-leakage between this location and the
furnace exit to verify that most, if not all,
of the casing leakage has been satisfactorily
repaired. This information can be used
to fix the leaks and may help to recover induced-draft
fan capacity, especially during
warmer summer months. These tests will
also identify the minimum O2
operating
level for best efficiency without excessive
Introducing Corzan HP, creating piping systems with better
®
CORROSION RESISTANCE
AND HIGH-TEMPERATURE PERFORMANCE
for transmission of CHEMICAL FLUIDS
LUBRIZOL TECHNOLOGY
all made with
TO GIVE YOU MORE INSIDE.
™
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POWER December 2014

Table of Contents for the Digital Edition of POWER December 2014