By Jiang Wu, Yan Cao, Weiguo Pan, Weiping Pan
Mercury (Hg) is without doubt one of the such a lot poisonous heavy metals, damaging to either the surroundings and human overall healthiness. Hg is published into the ambience from common and anthropogenic assets and its emission regulate has brought on a lot main issue. This publication introduces readers to Hg pollutants from common and anthropogenic resources 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 concept and experimental learn are proven, together with how elemental mercury is oxidized into oxidized mercury and the impact of flue fuel contents at the mercury speciation transformation approach. Mercury emission keep an eye on tools, corresponding to current APCDs (air toxins keep watch over units) at strength stations, sorbent injection, ingredients in coal combustion and photo-catalytic equipment are brought intimately. Lab-scale, pilot-scale and full-scale experimental reports of sorbent injection performed by way of the authors are awarded systematically, supporting researchers and engineers to appreciate how this method reduces the mercury emissions in flue gasoline and to use the equipment in mercury emission regulate at coal-fired strength stations. Readers will arrive at a accomplished figuring out of varied mercury emission keep watch over tools which are compatible for commercial applications.
The publication is meant for scientists, researchers, engineers and graduate scholars within the fields of strength technological know-how and know-how, environmental technology and expertise and chemical engineering.
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Extra info for Coal Fired Flue Gas Mercury Emission Controls
Flue gas from probe was split into two streams, one for dry-based module and the other for wet-based module. The data showed there was very little difference for Hg (0) between dry- and wet-based method, so HgT was focused on, and two kinds of catalysts (cat 1 and cat 2) for dry-based method were tested. The catalyst No. 1 (cat 1) helped Hg (2C) be converted into Hg (0) at the high temperature and the catalyst No. 2 at low temperature . HgT data by the wet-based method and dry-based method (cat 1 and cat 2) showed similar changing trend; however, there was some difference between them.
The modules for the dry- and wet-based SCEM system are shown in Figs. 6, respectively. Hg(2C) is soluble and in the wet-based module it was absorbed by KCl solution. Acid gases in the flue gas were absorbed by the NaOH solution before the flue gas entered the analyzer. In the dry-based method, reagent in the module absorbed the Hg(2C). The trap 2 in the analyzer will capture acid gases before the flue gas captured by the gold trap for analysis. With this process, elemental mercury concentration in the flue gas can be obtained .
In the wet-based SCEM system, HgT can be obtained by letting flue gas go through the solution of SnCl2 and NaOH. In the dry-based SCEM system, Hg (2C) will be converted into Hg (0) with the appropriate temperature and catalyst, so HgT can be obtained by making flue gas go through the catalyst at designed temperature. Hg (2C) concentration in the flue gas is the difference between HgT concentration and Hg (0) concentration . The elemental mercury Hg (0) in the flue gas was measured by the dry-based and wet-based SCEM system.
Coal Fired Flue Gas Mercury Emission Controls by Jiang Wu, Yan Cao, Weiguo Pan, Weiping Pan