Ferric Substance Formed in Circulateing Water for Boiler and Steam Piping Used for High Temperature Steam Supply Systems in City.

• Ishibashi Shin-ichiro

  Faculty of Engineering, Tokyo Engineering University

• Sato Toshihiko

  Faculty of Engineering, Tokyo Engineering University

• Yokoyama Masaru

  Faculty of Science and Technology, Keio University

• Haneda Koichi

  School of Science and Technology, Ishinomaki Senshu University

• Kato Yoshihiro

  NTT Advanced Technology

Bibliographic Information

Other Title

• 磁性材料の化学　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
• トシ ノ コウオン ジョウキ キョウキュウヨウ ボイラ オヨビ ハイカン スイ

Abstract

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 (Fe₃O₄) and weakmagnetic hematite (α-Fe₂O₃) 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.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 43 (1), 78-83, 1996

  Japan Society of Powder and Powder Metallurgy

Keywords

• ferric substance
• magnetite(Fe<SUB>3</SUB>O<SUB>4</SUB>
• hematite(α-Fe<SUB>2</SUB>O<SUB>3</SUB>
• boiler
• high temperature steam

Details

• CRID: 1390001206309360640
• NII Article ID: 10002011113
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.43.78
• COI: 1:CAS:528:DyaK28XhtlGhurc%3D
• ISSN: 18809014
• ISSN: 05328799
• ISSN: http://id.crossref.org/issn/05328799
• NDL BIB ID: 3918038
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3918038
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed