都市ごみ溶融を模擬したCaO-SiO_2-Al_2O_3系溶融スラグからの酸化鉛の揮発速度解析の検討  [in Japanese] Kinetic Study on Volatilization of PbO from CaO-SiO_2-Al_2O_3 Molten Slag Simulating Municipal Solid Waste Melting  [in Japanese]

    • 景山 広樹 KAGEYAMA Hiroki
    • 名古屋大学大学院工学研究科 エネルギー理工学専攻 Department of Energy Engineering and Science, Nagoya University

    • 河口 祐輝 KAWAGUCHI Yuuki
    • 名古屋大学大学院工学研究科 エネルギー理工学専攻 Department of Energy Engineering and Science, Nagoya University
    • 窪田 光宏 KUBOTA Mitsuhiro
    • 名古屋大学大学院工学研究科 エネルギー理工学専攻 Department of Energy Engineering and Science, Nagoya University
    • 松田 仁樹 MATSUDA Hitoki
    • 名古屋大学大学院工学研究科 エネルギー理工学専攻 Department of Energy Engineering and Science, Nagoya University

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Abstract

都市ごみの溶融過程におけるPbOの揮発挙動を模擬して,N<SUB>2</SUB>:80%-O<SUB>2</SUB>:20%雰囲気,溶融温度1,673~1,773K,溶融炉内のN<SUB>2</SUB>-O<SUB>2</SUB>混合ガス空間速度1.50×10<SUP>−4</SUP>~3.01×10<SUP>−3</SUP>m・s<SUP>−1</SUP>の流通条件下においてCaO, SiO<SUB>2</SUB>, Al<SUB>2</SUB>O<SUB>3</SUB>の含有量をそれぞれ10~60wt%の範囲で混合調整したCaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>系溶融模擬スラグからのPbOの揮発速度解析を行った。本研究では,溶融スラグ中および気相中のPbOの物質移動速度を求めるにあたり境膜説を用い,さらに常圧下におけるアルゴン気流中のMnの溶鉄からの蒸発速度を用いることによってN<SUB>2</SUB>-O<SUB>2</SUB>雰囲気におけるCaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>系溶融スラグからのPbOの揮発速度を推算した。また,本実験ではCaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>系溶融スラグからのPbOの揮発速度を見積るにあたり,総括物質移動係数をスラグ組成および温度の関数として求めた。<BR>その結果,本実験条件下ではN<SUB>2</SUB>:80%-O<SUB>2</SUB>:20%の混合ガス流速9.02×10<SUP>−4</SUP>m・s<SUP>−1</SUP>以上の条件ではCaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>系溶融スラグからのPbOの揮発速度は蒸発速度および液側物質移動速度の両者によって影響されることが認められた。また,本速度解析でもとめた計算結果は本実験範囲内において,粘度0.40~1.4Pa・sの低粘度のCaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>系溶融スラグに対して実験結果を比較的良く再現することができた。

A kinetic study on the volatilization of PbO from CaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> molten slag, which simulated the volatilization of PbO in municipal solid waste melting, was conducted at a temperature range of 1673 to 1773 K in an 80% N<SUB>2</SUB>, 20% O<SUB>2</SUB> atmosphere with a space velocity of N<SUB>2</SUB>-O<SUB>2</SUB> mixed gas of 1.50×10<SUP>−4</SUP>~3.01×10<SUP>−3</SUP> m·s<SUP>−1</SUP> in the melting furnace. The composition of the employed slag was varied by changing the weight ratio of CaO, SiO<SUB>2</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB> from 10 to 60wt%. The rate of volatilization of PbO was determined based on the film theory, with the assumption that the kinetic model might be applicable to the transportation of PbO from CaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> molten slag to the gas phase. The rate of volatilization of PbO from CaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> molten slag in an N<SUB>2</SUB>-O<SUB>2</SUB> atmosphere was estimated by taking into consideration the rate of vaporization of Mn from iron melting in an argon gas flow condition at atmospheric pressure. In the present study, the overall mass transfer coefficient was determined as a function of slag composition and temperature, and the rate of volatilization of PbO from CaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> molten slag was estimated.<BR>As a result, it was apparent that the rate of volatilization of PbO from CaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> molten slag in the N<SUB>2</SUB>-O<SUB>2</SUB> gas flow condition was influenced by both the rate of vaporization of PbO from the interface of gas-molten slag and the mass transfer rate of PbO in the liquid phase, when the flow rate of 80% N<SUB>2</SUB>, 20% O<SUB>2</SUB> mixed gas was higher than 9.02×10<SUP>−4</SUP> m·s<SUP>−1</SUP>. The calculated results on the volatilization of PbO predicted by the present kinetic study were in fairly good agreement with the experimental results for a low viscous CaO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> molten slag with 0.40 to 1.4Pa·s viscosity under the present experimental conditions.

Journal

Journal of the Japan Society of Material Cycles and Waste Management  

Journal of the Japan Society of Material Cycles and Waste Management 22(1), 52-60, 2011-01-31 

Japan Society of Material Cycles and Waste Management

References:  17

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Codes

  • NII Article ID (NAID) :
    10027949070
  • NII NACSIS-CAT ID (NCID) :
    AA12384878
  • Text Lang :
    JPN
  • Article Type :
    Journal Article
  • ISSN :
    18835856
  • NDL Article ID :
    11000142
  • NDL Source Classification :
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No. :
    Z16-2213
  • Databases :
    CJP  CJPref  NDL  J-STAGE