Dissertation > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization

Effect of Metals and Chlorine on the Oxidation of Mercury in Flue Gases during Coal Combustion

Author HuangYongZuo
Tutor XuMingHou;YaoHong
School Huazhong University of Science and Technology
Course Thermal Power Engineering
Keywords Coal combustion Mercury oxidation Thermodynamic equilibrium analysis Metal Chlorine
CLC X701
Type Master's thesis
Year 2007
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China 's coal-dominated energy consumption structure of air pollution from coal combustion . Following many pollutants sulfur dioxide , nitrogen oxides , carbon dioxide and other combustion sources of environmental pollution and prevention research areas , toxic trace elements in the coal-fired process emissions of mercury pollution has caused widespread concern in the world within the mercury and its compounds emissions control research has become an emerging frontier areas of research . In this study, by Research to carry out a series of tube furnace experiments of Na , K , of Ca and alkali metal of the the Hg oxidation reaction data , and to carry out the relevant calculations by thermodynamic simulation software , combined with metal and Cl Hg oxidation The combined effect . The details are as follows : ( 1 ) using the chemical thermodynamic equilibrium analytical methods , by means of the HSC chemistry 5.1 software , computational analysis of 473 ~ 2000K temperature range 0.1MPa pressure conditions , the different systems in different flue gas atmosphere , different chlorine concentration mercury Speciation and focus on mercury oxidation in the simultaneous presence of a variety of trace metals or alkali metal , the results show the existence of Cl competitive reaction between the metal and a variety of metal mixture coexist only in HgCl2 only a small amount of generation ( 2 ) in high- oxygen environment under the mantel of the multifunctional tubular rack experimental study of the actual flue gas mercury oxidation , different experimental conditions , by changing the Cl content of the raw coal , as well as adding metal test smoke HCl and SO2 in the gas component and the mercury oxidation ratio. The results show that the rate of oxidation of the mercury metal carbonate was added reduced from 86% to about 22% of HCl in the process emissions are greater reduction . Off Cl combustion flue gas mercury oxidation ratio reduced to only 7% and 10% , so that Cl plays a dominant role in the oxidation of mercury metal added to make the mercury oxidation was greatly inhibited .

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