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Factors affecting mercury emissions ...

Kellie, Shawn Andrew.

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Factors affecting mercury emissions from coal fired combustors.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Factors affecting mercury emissions from coal fired combustors./
作者:	Kellie, Shawn Andrew.
面頁冊數:	136 p.
附註:	Adviser: Wei-Ping Pan.
Contained By:	Dissertation Abstracts International66-04B.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3172279
ISBN:	9780542095030

Factors affecting mercury emissions from coal fired combustors.
Kellie, Shawn Andrew.

Factors affecting mercury emissions from coal fired combustors. - 136 p.

Adviser: Wei-Ping Pan.

Thesis (Ph.D.)--University of Louisville, 2005.

This dissertation investigated some of the factors affecting mercury emissions from coal fired power plants. The research was conducted in three studies. The first study involved the use of a lab scale 0.10 MWth fluidized bed combustor (FBC) to investigate the effects of the Ca/S mole ratio, co-firing municipal solid waste (MSW), combustion conditions and coal chlorine concentration on mercury emissions. The second and third study presented an unprecedented opportunity to study several coals at the same commercially operated 100 MWth boiler. The second study focused on comparing two methods of measuring mercury in flue gas, the Ontario Hydro Method (OHM) and semi-continuous emissions monitoring (SCEM). The third study focused on the mechanism of mercury transformation in flue gas. The data from all the studies lead to the development of a mechanism for the transformation of mercury.

ISBN: 9780542095030Subjects--Topical Terms:

586156
Chemistry, Analytical.

Factors affecting mercury emissions from coal fired combustors.
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520 $a This dissertation investigated some of the factors affecting mercury emissions from coal fired power plants. The research was conducted in three studies. The first study involved the use of a lab scale 0.10 MWth fluidized bed combustor (FBC) to investigate the effects of the Ca/S mole ratio, co-firing municipal solid waste (MSW), combustion conditions and coal chlorine concentration on mercury emissions. The second and third study presented an unprecedented opportunity to study several coals at the same commercially operated 100 MWth boiler. The second study focused on comparing two methods of measuring mercury in flue gas, the Ontario Hydro Method (OHM) and semi-continuous emissions monitoring (SCEM). The third study focused on the mechanism of mercury transformation in flue gas. The data from all the studies lead to the development of a mechanism for the transformation of mercury.
520 $a In the first study, several factors were found to affect mercury emissions. The chlorine content of the coal and secondary/primary air ratio were found to be important factors. When a high chlorine coal was used and the secondary/primary air ratio was greater than 0.15, more than 99% of fuel mercury was emitted as oxidized or particle bound mercury. Additionally, an increase in the Ca/S ratio was found to increase both the retention of mercury in the fly ash and its oxidation. In contrast, the results indicated that the amount of MSW co-fired with coal had no significant effect on the concentration of mercury in the fly ash.
520 $a The transformation of mercury in flue gas was further investigated in two additional studies using the 100-MW boiler with wall-fired low-NO x burners. The studies revealed that the OHM and SCEM displayed good agreement on the measurement of total vapor phase mercury, but differed in their measurement of mercury speciation. The presence of large quantities of fly ash at the test locations appeared to bias the OHM toward the measurement of elemental mercury. The studies also found a correlation between increased levels of HCl and SO2 and increased levels of oxidized mercury. Also, the studies found the coal chlorine content increased the retention of mercury on fly ash, but SO2 inhibited it. These observations and others lead to a mechanism of mercury transformation that involved SO 2, HCl, and NO2 all promoting mercury oxidation.
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