Nitrogen oxide abatement by distributed fuel addition Page: 4 of 9
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constitute the remainder of the combustor wall. The space between the wall and the
surrounding steel shell was packed with Kaowool 2300 insulation fiber (Babcock and
Wilcox) to a density of 0.20 # 0.02 g/cc.
A slab, 11.5 cm thick, was constructed of Kaolite 2200 (Babcock and Wilcox)
insulating refractory extending from the outer surface of the combustor wall to the
cylindrical steel shell. The purpose of this slab was to provide an alternative to the
use of the expensive mullite tubes as utility ports which allows the insertion of
various water cooled probes into the furnace for sampling, temperature measurement
or injection. Cylindrical tunnels, 5.1 cm in diameter, supported by the structure of
the slab and providing access into the furnace, would serve the same purpose, in
addition to a much longer expected service time.
At the top of the furnace, an expansion cone, 22.9 cm high, was made from
Kaocrete 28-Li castable refractory (Babcock and Wilcox) expanding from 5 cm at the
entrance to the full 14.5 cm of the combustor internal diameter.
SUMMARY
A new combustor with a modified design was constructed. This combustor has two
advantages over the previous one:
1. It is expected to have longer service time and reduced maintenance downtime.
Silicon carbide has proved to give excellent erosive service as was shown by the
performance of a similar type of combustor in our laboratory.
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Wendt, J. O. L. & Mereb, J. B. Nitrogen oxide abatement by distributed fuel addition, report, June 20, 1989; Tucson, Arizona. (https://digital.library.unt.edu/ark:/67531/metadc1111487/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.