Formation Characteristics of Fine Particulates with Na Compounds during Coal Combustion

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dc.contributor.authorTakuwa, Tsuyoshi
dc.contributor.authorMkilaha, Iddi
dc.contributor.authorNaruse, Ichiro
dc.date.accessioned2016-07-12T10:43:58Z
dc.date.available2016-07-12T10:43:58Z
dc.date.issued2003-10
dc.descriptionFull text can be accessed at https://www.jstage.jst.go.jp/FF01S040Init?sourceurl=%2Farticle%2Fjcej%2F36%2F11%2F36_11_1347%2F_pdfen_US
dc.description.abstractSome metal compounds in coal vaporize and form fumes during the combustion. The fumes are usually exhausted through the flue gas. For coal-fired combined power generation systems such as pressurized fluidized bed combustion (PFBC), hot metallic vapors may contact with the surfaces of gas-turbine blades. Since this contact of the hot vapors with the surface has a corrosive effect, it is necessary to control the formation of those fumes, which contain alkali metal compounds. In this paper, the evolution behavior of alkali metal compounds, especially sodium compounds, has been studied, using an electrically heated drop tube furnace with a low-pressure impactor. The main objective in this study is to elucidate the conditions and the possible mechanisms to form alkali metal compounds in particulate matter during combustion. Two types of coal with different sodium contents were tested, where the coal conversion characteristics were established. Furthermore, the evolution and inclusion of sodium compounds into the sub-micron particles were studied in relation to the particle size distribution and sodium fraction distribution in the collected particulates. The study proved that the evolution and inclusion of sodium on sub-micron particles depended on the functions of the coal type. The reaction-controlled mechanism and heterogeneous condensation via chemical reactions during the combustion much more influenced the inclusion of sodium in sub-micron particles. At the coarse particles of above about 0.5 μm, the reaction that formed the particles was mainly via gas film diffusion surrounding the particle.en_US
dc.identifier.citationTakuwa, T., Mkilaha, I.S.N. and Naruse, I., 2003. Formation Characteristics of Fine Particulates with Na Compounds during Coal Combustion. Journal of chemical engineering of Japan, 36(11), pp.1347-1351.en_US
dc.identifier.doi10.1252/jcej.36.1347
dc.identifier.urihttp://hdl.handle.net/20.500.11810/3107
dc.language.isoenen_US
dc.subjectCoalen_US
dc.subjectCombustionen_US
dc.subjectAlkali Metalen_US
dc.subjectFine Particulateen_US
dc.subjectFluidized Bed Combustionen_US
dc.titleFormation Characteristics of Fine Particulates with Na Compounds during Coal Combustionen_US
dc.typeJournal Articleen_US
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