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Maintaining Low Oxygen (O2) in Coal Fueled Utility Boilers Using CO Instrumentation
Date
1986-06Metadata
Show full item recordAbstract
Following evaluation of various CO monitors and
close attention to the boiler operating conditions,
Southwestern Public Service Company has been successful
in reducing the operating level of oxygen
in Unit #1 at Tolk Station. This paper will present
the experience to this point indicating the
value of the increased efficiency and the annual
fuel savings possible from this O2 reduction.
Unit til 1.8 a pulverized coal fired, 565 MW, CE
boiler system placed in service July 27, 1982.
Complete and safe combustion in this boiler is
maintained by continuously monitoring O2 and CO
in the boiler exhaust. The addition of CO monitors
has enabled SPS to begin the process of establishing
exhaust O2 levels at each firing rate.
The CO signal is recorded and monitored, but it
has not been used as an active element in closed
loop control. The target CO level of 100-200 ppm
produces an average O2 level of between 2.0% and
2.5%. Transient peaks of 1000 to 1200 ppm of CO
are not unusual because CO production is affected
by many process variables. SPS's selection of a
multi-parameter CO/CO2/H2O instrument provide
the ability to measure CO2 and CO and to validate
accuracy of these components on-line by introduction
of standard gases at stack temperature and
pressure. Crosschecking the O2 monitor and the
calculated O2 reading from the CO monitor, also,
provides on-fine confirmation of each instrument.
Experience also validates the relationship between
CO, excess air and NOx production.
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Citation
Hopkins, D.; Downing, T. (1986). Maintaining Low Oxygen (O2) in Coal Fueled Utility Boilers Using CO Instrumentation. Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /93074.