赤泥スラリーによる排煙脱硫に関する研究　　基礎研究および吸収塔の選定

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  • SO<SUB>2</SUB> Removal from Waste Gas by Red Mud Slurry
  • セキデイ スラリー ニヨル ハイエン ダツリュウ ニカンスルケンキュウ キソ
  • -基礎研究および吸収塔の選定-

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To develop a process for SO2 removal from waste gas by red mud slurry as a waste obtained from the Bayer process, equilibrium is measured for SO2-containing gas, and the slurry and absorption rate is also measured in semi-batchwise bubble-column gas absorption system.<BR>Johnstone's equilibrium equation for SO2-Na2SO3 solution turns out to be applicable for the system of SO2-red mud slurry.<BR>Oxidation of the red mud accelerates SO2 absorption.<BR>To select an absorber for an SO2 removal plant using red mud slurry, pilot plant tests at 1, 300 Nm3/hr were performed using a spray absorber, TCA and a perforated-plate absorber.<BR>1) Spray absorber : The efficiency of SO2 removal (Mass transfer coefficient KGa) is high enough to be applied to the plant. However, long term operation cannot be expected because of high wearing rate of spray nozzle.<BR>2) TCA : The efficiency of SO2 removal per tray (Murphree tray efficiency) is 0.50.6 at a gas velocity of 1.53.0m /s. The continuous operating time is limited to about 4 months by the wearing of ball in the absorber.<BR>3) Perforated plate absorber without downcomers : Stable operation can be obtained in the gas velocity range of 1.02.5 m/s. The efficiency of SO2 removal per tray is 0.40.6 and is higher than that using TCA at the same pressure loss.

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