| 摘要 |
<p>PURPOSE:To supply O2 in proper quantities and to suppress the loss of a catalyst to a lower degree, in blowing an O2-containing gas into the treating liquid of a H2S containing gas comprising a basic aqueous solution containing a redox catalyst, by controlling the amount of O2 to be blown corresponding to the consumption amount of O2 of the treating liquid after the catalyst is regenerated. CONSTITUTION:An H2S containing gas 1 is blown into an absorbing tower 2 along with an N2-gas and a CO2-gas for adjusting a pH and an alkaline aqueous solutin is scattered from the top part of the tower 2 to absorb H2S. On the other hand, NaHS and NaHCO3 formed by the above mentioned absorption are sent to a reaction tank 3 and oxidized by vanadic acid in a reaction liquid to precipitate S. By this reaction, the reduction of V<5+> to V<4+> is carried out but, because a quinone compound is present together in the reaction liquid, the regeneration of V due to the oxidation of V<4+> to V<5+>. Subsequently, the reaction mixture is sent to an oxidizing tank 4 and the catalyst is regenerated while an O2 containing gas is blown thereinto from the bottom part thereof. In this case, the treating liquid discharged from the tank 4 is sampled in a measuring part 8 to measure the consumption amount of O2 and an air blowing amount to the tank 4 is controlled based on the measured result. Therefore, a required min. limit of an O2 supply amount can be determined corresponding to an operational state.</p> |
