Reprocessed OFF gas processing device

Purpose: To prevent iodine corrosion of equipments with no reduction in iodine adsorption performance and with no use of high quality corrosion resistant materials. Constitution: Off gases from an iodine purging tower and a NOx absorption tower are introduced with no heating from the bottom to the inside of an iodine absorption tower using an alkali solution such as of NaOH, KOH, Mg(OH)2, Ca(OH)2, etc. An alkali solution in an alkali solution vessel is jetted out from the top of the absorption plate by means of an alkali solution pump and a gas-liquid reaction is taken place with iodine-containing gases uprising the from the bottom. Thus, iodine I2 in the gases is dissolved and adsorbed substantially completely into the alkali solution and forms I-ions. Since iodine I2-containing gases are not heated and iodine I2 are converted into I-ions, iodine corrosion of equipments can be prevented. (Takahashi, M.)