Patent ID: 6235256
Filing Date: 2001-05-22
Classification: B01D

Abstract:
Process for wet scrubbing of acidic gases from flue gases by means of alkaline or earth-alkaline absorbents, lime stone and/or dolomite, comprising the steps of:scrubbing the flue gas in a first stage by spraying liquid droplets into a spray tower and directing the flue gas to flow in a direction opposite to the flow of the liquid droplets in the spray tower,scrubbing the flue gas in a second stage situated after the first stage in a flow direction of the flue gas by spraying liquid droplets, through a plurality of nozzles, into a channel arranged in the spray tower and directing the flue gas to flow in the same direction as the flow of the liquid droplets being sprayed into the channel,arranging a first demister after the channel in the flue gas flow direction such that a reaction zone is defined within the channel between an inlet of the channel and the first demister,directing the droplets in the first demister to turn 180.degree. in substantially parallel and concentric channels,directing the droplets from the first demister to a second demister,collecting the droplets after interacting with the flue gas in an oxidation tank,oxidizing sulfite in the suspension in the oxidation tank by directing at least one of air and flue gas into the oxidation tank, andmaintaining a level of suspension in the oxidation tank which is substantially equal to a level at which the spray nozzles are situated.