REMOVING METHOD FOR HALOGEN CONTAINING SUBSTANCE FROM DESORBED GAS USED IN DRY DESULFURIZATION METHOD

摘要

PURPOSE:To prevent troubles such as the corrosion of an apparatus and the poisoning of a catalyst by condensing moisture in a desorbing gas used in a dry desulfurization method immediately before introducing the gas into a Claus furnace and removing a halogen contg. substance from the gas by dissolution in the condensate. CONSTITUTION:A gas to be treated is introduced into an adsorbing zone alpha. A desorbing gas such as superheated stem is introduced into a desorbing zone beta after finishing adsorption from a line 3 and circulated through a line 4 to desorb SO2. At this time, the zone beta is kept at a prescribed desorption temp. with a heat exchanger H and cooler K. When SO2 in the circulating desorbing gas reaches a prescribed concn., the gas is introduced into lines 5, 6 in 2:1 ratio. After almost thoroughly reducing SO2 in the gas in the line 5 with a reducing furnace gamma, the gas is mixed with the gas in the line 6 and introduced into a condenser xsi, where moisture in the mixed gas is condensed and a halogen contg. substance is dissolved in the condensate and discharged from a line 10. The resulting gas is introduced into a Claus furnace delta and reacted to recover S from a line 7. The remaining gas is fed to an incinerator epsilon.