DESULFURIZATION METHOD AND DESULFURIZATION EQUIPMENT FOR RECOVERING SO2 IN GAS TO BE TREATED AS CASO4 IN COEXISTENCE OF NO AND/OR NO2

摘要

PROBLEM TO BE SOLVED: To separate and recover SO₂ in a gas to be treated as CaSO₄ in a high efficiency.;SOLUTION: The gas to be treated is brought into contact with an SO₂ desulfurizing agent, which is obtained by coating the surface of carrier particles having a large particle size with Ca(OH)₂ of fine particles, in a fluidized bed type reaction column 1 by making 10-5,000 ppm NO and/or NO₂ coexist in the SO₂-containing gas to be treated. The CaSO₄ produced in the column 1 is fluidized in the first gas-solid separator 2 together with the carrier particle and the gas to be treated so that the carrier particle is separated by sedimentation from the gas containing the CaSO₄ produced in the column 1 and exfoliated. The gas containing the CaSO₄ is withdrawn from the upper part of the separator 2 and fed to the second gas-solid separator 3 so that the CaSO₄ is separated and recovered from the gas to be treated by fluidization.;COPYRIGHT: (C)2004,JPO