Fundamentals on Evaporation of Alkali Compounds.

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  • Noda Reiji
    Department of Ecological Engineering, Toyohashi University of Technology
  • Takano Tsuyoshi
    Department of Ecological Engineering, Toyohashi University of Technology
  • Naruse Ichiro
    Department of Ecological Engineering, Toyohashi University of Technology
  • Ohtake Kazutomo
    Department of Ecological Engineering, Toyohashi University of Technology

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  • アルカリ金属化合物の基礎蒸発特性
  • アルカリ キンゾク カゴウブツ ノ キソ ジョウハツ トクセイ

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Abstract

In order to obtain fundamental data for alkali metal vaporization, the evaporation rate of alkali chlorides and alkali sulfates (NaCl, KCl, Na2SO4, K2SO4), which are major alkali compounds present in coal, were measured under inert, oxidizing and reducing atmosphere by using a thermobalance. A diffusion model was applied to obtain alkali metal evaporation data and identify an evaporating path and a rate controlling phenomena.<BR>Alkali chlorides evaporated as monomers and dimers. The evaporation rate is explained by a diffusion model. In the case of alkali sulfates, a dissociation reaction occurred simultaneously with evaporation as monomer. In inert and oxidizing atmospheres, the dissociation reaction was represented as<BR>M2SO4⇒2M+SO2+O2<BR>Evaporation rates can be calculated by a diffusion model in oxidizing atmosphere. In an inert atmosphere, however, when dissociation becames remarkable evaporation rate is controlled by the dissociation rate. Under a reducing atmosphere the expected reaction was represented as<BR>M2SO4+2CO⇒2M+SO2+2CO2<BR>This reaction does not reach equilibrium, so that the following reactions controll evaporation rate.<BR>M2SO4⇒2M+COS+5CO2<BR>COS+2CO2⇒SO2+3CO

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