都市の高温蒸気供給用ボイラ及び配管水溶液中の鉄系生成物 Ferric Substance Formed in Circulateing Water for Boiler and Steam Piping Used for High Temperature Steam Supply Systems in City

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Boilers are used to generate steam in many fields such as building and thermal power generation. Products from water evaporation adhere to boilers and their piping as scale or precipitate as sludge, obstructing the flow of steam to lower the thermal efficiency of steam. The detailed data on ferric substance in compositions of such scale and sludge are not well known yet. The author have reported about detailed results of studies emphasizing ferric substance in boilers and their piping used for heating building with steam of 100°C. To clarify the compositions of such substance, we have studied boilers that supply high temperature steam of 180°C to high-rise buildings, mainly investigating the ferric substance in boilers and piping. What has attracted our attention in the study is the fact that ferromagnetic magnetite (Fe<SUB>3</SUB>O<SUB>4</SUB>) and weakmagnetic hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) accounted for about 98% of the substances. The average grain sizes of magnetite and hematite were about 105 nm and 160 nm respectively, being larger than those of the heating boilers due to the higher steam temperature. The saturation magnetization was about 79 emu/g, and 82 emu/g when corrected for nonmagnetic layer, being close to the bulk magnetite.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 43(1), 78-83, 1996-01-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002011113
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    3918038
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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