Measurement of chemical emissions under the influence of low-NO{sub x} combustion modifications. Final report

Technical Report · Fri Oct 08 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/10113468· OSTI ID:10113468

Dismukes, E B

Effect of low-NO{sub x} firing. There was no clear-cut effect on the emission of trace metals or acid gases. The data give marginal evidence for a decreased emission of Cr(VI), which would be a favorable change but is not certain by any means. The effect on aldehydes and ketones cannot be stated because of the loss of samples for baseline conditions; no credible data on these compounds were obtained for baseline conditions. The change in volatile organics appeared to be a reduction in emissions, whereas that for semi-volatiles seemed to be an increase. Inasmuch as low-NO{sub x} firing is sometimes accompanied by large increases in the amount of unburned carbon in the ash, the result for semi-volatiles is more in line with expectation. Effect of the hot-side ESP. As indicated above, the hot-side ESP lowered trace-element emissions to the range roughly from 1 to 5% of the levels found in the inlet gas stream. Not surprisingly, the hot-side ESP had no measurable influence on the emissions of SO{sub x}, HF, and HCl. Quite surprisingly, on the other hand, the ESP seemed to suppress the emission of certain organic substances. Suppression of the emission of formaldehyde is particularly difficult to explain. Presumably, the apparent disappearance of organics in the vapor state may be due in part to chemical changes at the high temperature of the ESP or in the corona regions, where ozone and other high-energy reactants are present. Perhaps chemical destruction was aided in the instance of semi-volatile compounds by relatively long residence times at high temperature while the compounds were adsorbed on ash particles in the hoppers. Effect of the cold-side ESP. Limited data with the cold-side ESP in operation made it difficult to detect any but the most emphatic effect of that ESP. No dramatic effect was seen.

• Research Organization: Southern Research Inst., Birmingham, AL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Electric Power Research Inst., Palo Alto, CA (United States)
• DOE Contract Number: FC22-90PC89653
• OSTI ID: 10113468
• Report Number(s): DOE/PC/89653--T12; ON: DE94005038; BR: AZ0404030
• Country of Publication: United States
• Language: English

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