<報文>都市ゴミ焼却灰のプラズマ溶融処理

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  • トシ ゴミ ショウキャクバイ ノ プラズマ ヨウユウ ショリ
  • <Original Paper>Melting of Incinerator Residue by Plasma Arc Furnace

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Incinerator residue from the incinerating of municipal solid wastes is, in most cases, disposed of by burying it underground. However, due to the difficulty of obtaining land for landfill disposal, it became extremely important to develop a treatment for reducing its volume and making it harmless. Melting treatment is expected to be available for solving these demands. In this work, plasma arc melting of the residue has been examined using a pilot-plant-scale 240kW DC plasma arc furnace developed for treating of the residue. Air was used as the plasma generating gas. With air-plasma-arc heating, the residue was perfectly melted above 1500℃ and resulted in two phases separated into molten slag and molten metal. As a result, power consumption was approximately 0.88 kWh/kg of the residue at a feed rate of 182 kg/h. Therefore, this melting process is considered to be useful for the practical melting of the residue. Also, the residue was reduced in volume by 1/2 and was made completely harmless. The slag produced by melting the residue is, therefore, expected to be reused as roadbase materials, etc.

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