Abstract
Coal-fired-derived flue gas mercury measurement mainly includes Ontario Hydro Method, semicontinuous emission monitor, and Appendix K. The Ontario Hydro Method (OHM) is the standard method of measuring and speciating mercury in flue gas, and its solutions were analyzed using a Leeman Labs Hydra AA. The semicontinuous emission monitor (Hg SCEM) uses a gold trap to collect the mercury from the flue gas before analysis with an atomic fluorescence detector. Appendix K (or EPA method 324) is for the continuous sampling of mercury emissions in combustion flue gas streams with sorbent traps. The resulting leachate is analyzed by a cold vapor atomic fluorescence spectrometer (CVAFS) or by a cold vapor atomic absorption spectrometer (CVAA).
We have investigated the comparison between different mercury emission measurement methods, SCEM and OHM, in a 100 MW boiler with wall-fired low-NOx burners, and found that OHM produced consistently higher levels of oxidized mercury than SCEM and the OHM measured higher levels of elemental mercury than SCEM after the ESP. It is logical to assume that fly ash may play a role in the differing measurement of elemental mercury at sampling locations. Moreover, using OHM data as the denominator does not imply that the OHM data are more accurate than the SCEM data and agreement between the two methods seemed to be dependent on the test location.
We also measured the mercury emissions by OHM, CMM, SCEM, and Appendix K in two plants. The data from two continuous mercury monitors (SCE and CMM) show a good consistency with OHM data during the test. However, there are big discrepancies between the data from Appendix K and that from methods of SCEM, CMM, and OHM. The data of compared measurements between OHM, SCEM, and Appendix K show the same trends, which were consistent with the boiler load trend. The data from two continuous mercury monitors (SCE and CMM) show a good consistency with OHM data during the test. Compared with the testing results, the CMM provided valid and representative HgT data and the little lower Hg0 data than that from the OHM and SCEM during most of the tested time.
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Wu, J., Cao, Y., Pan, W., Pan, W. (2015). Coal-Fired-Derived Flue Gas Mercury Measurement. In: Coal Fired Flue Gas Mercury Emission Controls. Energy and Environment Research in China. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46347-5_3
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DOI: https://doi.org/10.1007/978-3-662-46347-5_3
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