都市ごみ焼却灰のプラズマ溶融特性

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  • Characteristics of the Plasma Melting Process for Municipal Solid Waste (MSW) Incineration Ash
  • トシ ゴミ ショウキャクバイ ノ プラズマ ヨウユウ トクセイ

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The plasma melting process for municipal solid waste incineration ash has been demonstrated. A melting process transforms MSW incineration ash into something which is harmless and reduces the ash volume. Therefore, various melting processes have so far been suggested for effective ash treatment prior to its dumping on landfill sites. The purpose of this program is to research the characteristics of ash melting using thermal plasma as the energy source. One of the advantages of the plasma melting process is high heat efficiency, since the plasma gas temperature is extremely high. Fly ash and bottom ash emitted from the fluidized bed and stoker incinerator were tested and the melting performances were compared. The NOx reduction method using town gas has also been developed. Thermogravimetry analysis was conducted for each sample to estimate the behavior of ash components under high temperature. The results of the analysis were closely related to the value of the slag capture ratio. The experimental results indicate that the heat efficiency of the plasma process is over 50%. This efficiency is higher than that of the conventional combustion method. NOx concentration in flue gas is less than 150 ppm, and the NOx reduction ratio is over 90%

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