| 摘要 |
<p>PURPOSE:To eliminate decrease of the removal rate of hydrogen halide in a dust removal tower by removing dust and acid gases in exhaust gas using circulation liquid which is adjusted to pH1-3 in the dust removal tower of a wet type flue gas desulfirization apparatus. CONSTITUTION:Flue gas 1 is introduced into a dust removal tower 2, where dust, HCl, etc., are removed and at the same time the gas is cooled. The flue gas 8 leaving the tower is introduced into an absorption tower 9, where sulfur oxides in the gas are absorbed and removed using alkali agent such as limestone slurry. The slurry having absorbed sulfur oxides in the gas is sent to a recovery system of gypsum, by-product, through a duct 14. An alkali agent feed means is provided for the dust removal tower 2, whereby alkali agent is supplied from said means to a dust removal tower circulation tank 15 so that pH value of circulation liquid of the tower 2 falls within the range of 1-3.</p> |
