Download PDF by Jiang Wu, Yan Cao, Weiguo Pan, Weiping Pan: Coal Fired Flue Gas Mercury Emission Controls

By Jiang Wu, Yan Cao, Weiguo Pan, Weiping Pan

Mercury (Hg) is likely one of the so much poisonous heavy metals, damaging to either the surroundings and human future health. Hg is published into the ambience from ordinary and anthropogenic assets and its emission keep watch over has prompted a lot obstacle. This ebook introduces readers to Hg pollutants from normal and anthropogenic assets and systematically describes coal-fired flue fuel mercury emission keep watch over in undefined, in particular from coal-fired energy stations. Mercury emission keep watch over idea and experimental examine are established, together with how elemental mercury is oxidized into oxidized mercury and the impact of flue gasoline contents at the mercury speciation transformation approach. Mercury emission keep an eye on equipment, akin to present APCDs (air pollutants keep an eye on units) at energy stations, sorbent injection, ingredients in coal combustion and photo-catalytic tools are brought intimately. Lab-scale, pilot-scale and full-scale experimental stories of sorbent injection carried out by way of the authors are provided systematically, supporting researchers and engineers to appreciate how this procedure reduces the mercury emissions in flue gasoline and to use the equipment in mercury emission keep watch over at coal-fired energy stations. Readers will arrive at a entire realizing of assorted mercury emission keep watch over equipment which are compatible for commercial applications.

The booklet is meant for scientists, researchers, engineers and graduate scholars within the fields of power technological know-how and expertise, environmental technology and expertise and chemical engineering.

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76 Reprinted from Ref. [1], Copyright 2004, with permission from Elsevier Because of the trendobserved for oxidized mercury, an analogous trend might be expected in element vapor-phase mercury data, as shown in Fig. 16. There is a large disagreement between the two methods. For coal 2 after the ESP, OHM measures three times the quantity of elemental vapor-phase mercury, as does SCEM. For coal 1 before the ESP, SCEM measures a third more mercury than OHM. The only trend evident in comparing the elemental mercury data between the two methods is that the OHM measured higher levels of elemental mercury than SCEM after the ESP.

17 Schematic description of unit and sampling locations (Reprinted from Ref. [17], Copyright 2010, with permission from Elsevier) The mercury emissions by four measurements of OHM, CMM, SCEM, and Appendix K in power plant 1 and power plant 2 are shown in Figs. 19, respectively. 08 kg/h, and the blending ratio of Taxes Lignite and PRB bituminous coal was 57 %/43 %. In power plant 2, the averaged boiler load was 852 MWe with a standard deviation of 3 MWe, the percentage of flue gas bypassing the FGD was 15–22 %, and the blending ratio of Taxes Lignite and PRB was 91 %/9 %.

The RSD of every day’s data by the dry- and wet-based method was calculated, and the RSD of mercury concentration data by the dry- and wet-based method is shown in Fig. 10. The relative standard differences of catalyst No. 1, catalyst No. 2, and wet method were 9–38 %, 12–37 %, and 18–56 %. The data by the dry-based method has a better stability than the wet-based method. The OHM sampling test, a standard method recommended by the US EPA, was conducted to verify the data by the SCEM system. During this phase drybased method with catalyst No.

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