ABSORPTION TOWER OF WET TYPE STACK GAS DESULFURIZATION APPARATUS

摘要

PURPOSE:To perform effectively the absorption and oxidation of SOX by dividing the liquid reservoir part of lower part of absorption tower into the liquid reservoir part of front stage free in contact with waste gas and the liquid reservoir part of rear stage incapable of contact with the waste gas by means of a partition board capable of overflow and a sealing separation plate. CONSTITUTION:The liquid reservoir part of absorption tower 800 is divided into front and rear stages with a partition board 500 and a separation plate 300 is provided in order to make the structure noncontacting with waste gas of the liquid reservoir part 200 of the rear stage. A suspension soln. is brought into contact with combustion waste gas 1 countercurrently in a gas- liquid contacting part 600 of the absorption tower 800 to absorb SOX and flowed down on the separation plate 300 and at first collected in the liquid reservoir part 100 of the front stage and thereafter overflowed on a partition board 500 between the separation plate 300 and the partition board 500 and entered the liquid reservoir 200 of the rear stage. In the front stage, the pH is low under contacting with the combustion waste gas high in CO2 partial pressure and the oxidation of SOX is accelerated and in the rear stage, the pH recovering velocity and the dissolving velocity of an alkaline absorbent are increased with the sealing effect of the separation plate 300 and the suspension soln. is made the state preferable for the circulation to the gas-liquid contacting part 600.