Gasification and Desulfurization Characteristics of Carbonaceous Materials in Molten Alkali Carbonates

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  • RAHARJO Slamet
    Department of Mechanical Science and Engineering, Nagoya University
  • TAKUWA Tsuyoshi
    EcoTopia Science Institute, Nagoya University
  • IWASAKI Shin
    Department of Ecological Engineering, Toyohashi University of Technology
  • YOSHIIE Ryo
    Department of Mechanical Science and Engineering, Nagoya University
  • NARUSE Ichiro
    Department of Mechanical Science and Engineering, Nagoya University

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Other Title
  • 溶融アルカリ炭酸塩を用いた炭素系物質のガス化・脱硫特性
  • ヨウユウ アルカリ タンサンエン オ モチイタ タンソケイ ブッシツ ノ ガスカ ダツリュウ トクセイ

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This study focuses on gasification technology of carbonaceous materials in molten carbonates since this gasifier can gasify those fuels catalytically and in-situ clean up the gasified gas at high temperature simultaneously. This gasification system has such advantages that alkali metal compounds have catalytic function for the gasification reactions, the molten alkali compounds can absorb sulfur compounds and the molten media can capture ash and un-reacted particles produced. The molten carbonate employed in this study is an eutectic salt with the compositions of 43 mol% Na2CO3 and 57 mol% K2CO3. CO2 is selected as a gasification agent. Before the gasification experiments, the optimum gasification and desulfurization temperature is evaluated by the chemical equilibrium calculations. Fundamental gasification and desulfurization experiments were conducted, by using an electrically heated reactor. As a result, the main compositions of the gasified gas are CO, H2 and CH4. H2S and COS gases in the product can be absorbed almost completely by the molten alkali carbonates. These results suggest that this gasifier can gasify the carbonaceous materials and desulfurize even at high temperature inside the furnace simultaneously.

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