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Occurrence and volatility of several trace elements in pulverized coal boiler

Journal of Environmental Sciences 2004年第2期16卷 242-246页

作者： HUANGYa-ji JINBao-sheng ZHONGZhao-ping XIAORui TANGZhi-yong RENHui-feng EducationMinistryKeyLaboratoryonCleanCoalPowerGenerationandConll）ustionTechnology SoutheastUniversityNanjing210096China. thermoelectricpowerplantofyangzipetrochemicalco. Nanjing210002China.

The contents of eight trace elements(Mn, Cr, Pb, As, Se, Zn, Cd, Hg) in raw coal, bottom ash and fly ash were measured in a 220 t/h pulverized coal boiler. Factors affecting distribution of trace elements were investigated, including fly ash diameter, furnace temperature, oxygen content and trace elements' characters. One coefficient of Meij was also improved to more directly show element enrichment in combustion products. These elements may be classified into three groups according to their distribution: Group 1: Hg, which is very volatile. Group 2: Pb, Zn, Cd, which are partially volatile. Group 3: Mn, which is hardly volatile. Se may be located between groups 1 and 2 Cr has properties of both group 1 and 3 In addition, the smaller diameter of fly ash, the more relative enrichment of trace elements(except Mn). The fly ash showed different adsorption mechanisms of trace elements and the volatilization of trace elements rises with furnace temperature. Relative enrichments of trace elements(except Mn and Cr) in fly ash are larger than that in bottom ash. Low oxygen content can not always improve the volatilization of trace elements. Pb is easier to form chloride than Cd during coal combustion. Trace elements should be classified in accordance with factors.

关键词： occurrence volatility relative enrichment trace element group of elements

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