Development of advanced, dry, SO{sub x}/NO{sub x} emission control technologies for high-sulfur coal. Final report, April 1, 1993--December 31, 1994 Page: 63 of 91
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In the MgO process, it is also important to minimize the oxidation of magnesium sulfite
because magnesium sulfate requires a higher regeneration temperature. During this phase, EDTA (160
ppm) and p-aminophenol (10 ppm) were used as antioxidants in the feed slurry. Ash analyses of two
samples taken from the dry scrubber hopper showed that most of the sulfur occurred in the sulfite
form. However, 12% oxidized to the sulfate indicating that the antioxidants were not completely
effective.
System Operability
All tests were conducted with the DID installed at the scrubber outlet. The DID performed
well throughout this phase. In previous phases using lime slurry above 10% solids, little material
collected on the DID. During this phase, however, it was noticed that deposition on the DID was
greater, even at approach temperatures of 25 F and solids concentrations of 20%. In addition, the
deposits had a greater tendency to remain moist at low T.. Consequently, Ty was limited to 15"F.
The texture of the DID deposits also differed from lime-based deposits in that they tended to
be more granular. Ash from the baghouse hopper was also more granular, but still flowed freely and
caused no handling problems. The granular nature of the ash raises concerns over their suitability as a
recycle material. In a commercial application, the large granules would have to be broken up or
strained to prevent plugging the atomizer and interfering with atomization quality.
Post-test inspections revealed no significant deposition on the atomizer, scrubber walls, flues,
or in the baghouse. At a T. of 15*F, baghouse ash appeared dry and flowed freely. As mentioned
above, deposition on the DID increased for this phase, but was compensated for by operating at higher
Ta.
2.2.9 Pmject Conclusions and Accomplishments
SO/NO Removal
The most significant highlight of this project is that the SO2 removal goals were surpassed for
all of the lime-based technologies. This demonstrates ability of these technologies to minimize
pollution when burning high-sulfur, Eastern coal.
Results of Ca-Based Advanced Dry Scrubbing
Technology Ca/S Ratio T., (OF) % SO2 Removal
Dry Scrubbing 1.15 10 98
LIDS 1.44 11 99
A+LIDS - SO2 1.00 10 99
- NO, 3.2 NH3/NOX 56% NO,2-47
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Amrhein, G.T. Development of advanced, dry, SO{sub x}/NO{sub x} emission control technologies for high-sulfur coal. Final report, April 1, 1993--December 31, 1994, report, December 23, 1994; United States. (https://digital.library.unt.edu/ark:/67531/metadc783090/m1/63/?rotate=90: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.