Evaluation of a zirconium additive for the mitigation of molten ash formation during combustion of residual fuel oil Page: 33 of 51
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Air Ir
Air Out
Hinged Probe DoQr j
Figure A-4. Detail of probe bank construction.
The operating conditions and procedures described above are those normally utilized in studying
the ash-fouling tendencies of low-rank western coals. They are included for the purposes of reference
and description, and for comparison with the conditions actually utilized when burning slurry fuel.
The test furnace has numerous ports that permit observation of the probes and the furnace burner
zone during the test run. These ports can also be used for installation of additional test probes, auxiliary
measurements, photography of probes, or injection of additives.
At the completion of the test period, the probe door is carefully opened and photographs are taken
of the deposit. The deposit is then removed from the probes in two fractions, an inner and an outer
layer, and each is weighed and analyzed separately. Normally the inner white layer weighs less than 10
grams, as compared to 100 to 500 grams for the outer sintered deposit.
The weight of ash deposited on the probe bank during a standard test is used to rank the coal for
its relative fouling potential. To ensure that the pilot-scale test results are meaningful for evaluation of
ash-fouling potential in full-scale utility boilers, calibration tests were previously conducted with low-rank
coals known to produce low and high fouling in utility boilers. Comparisons of ash fouling have been
made based on tests conducted at a number of power stations throughout the western United States:
Monticello (Texas Utilities), Big Brown (Texas Utilities), Four Corners (Arizona Public Service
Company), St. Clair (Detroit Edison Company), Jim Bridger (Pacific Power and Light), Big Stone (Otter
Tail Power Company), Leland Olds (Basin Electric Power Cooperative), and San Miguel (San Miguel
Electric Cooperative). Based on these tests, the ash deposit buildup rate on the probe bank was foundA-5
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Evaluation of a zirconium additive for the mitigation of molten ash formation during combustion of residual fuel oil, report, December 1, 1996; Grand Forks, North Dakota. (https://digital.library.unt.edu/ark:/67531/metadc698765/m1/33/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.