초록 ▼

Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combust

Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc., and formed into slurry, and Se is made into insoluble compound; and (5) a treating agent for making tetravalent Se insoluble is added to part of circulation liquid in desulfurization apparatus, and it is sprayed into combustion exhaust gas to make Se insoluble.

대표청구항 ▼

Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combust

Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc., and formed into slurry, and Se is made into insoluble compound; and (5) a treating agent for making tetravalent Se insoluble is added to part of circulation liquid in desulfurization apparatus, and it is sprayed into combustion exhaust gas to make Se insoluble. apparatus of claim 6, further comprising a wastewater treatment apparatus for treating wastewater from the desulfurization apparatus, and treating agent means for feeding a treating agent into the impurity slurry separated by this wastewater apparatus, for making tetravalent Se insoluble. 8. A combustion exhaust gas treatment apparatus for treating combustion exhaust gas containing sulfurous acid, dust and Se components, comprising a dry dust collector for removing dust in the combustion exhaust gas, a desulfurization apparatus having a cooling and dust collecting column disposed upstream of an absorption column and a desulfurization column in which an absorbent slurry for absorbing and removing sulfurous acid circulates, means for feeding the dust into a circulating slurry in the cooling and dust collecting column, and means for feeding a treating agent into the circulating slurry in the cooling and dust collecting column, for making tetravalent Se insoluble. 9. A combustion exhaust gas treatment apparatus of claim 8, further comprising a wastewater treatment apparatus for treating wastewater from the desulfurization apparatus, and treating agent means for feeding a treating agent into the impurity slurry separated by this wastewater apparatus, for making tetravalent Se insoluble. 10. A combustion exhaust gas treatment apparatus for treating combustion exhaust gas containing a sulfurous acid, dust and Se components, comprising a desulfurization apparatus having a cooling and dust collecting column disposed upstream of an absorption column and a desulfurization column in which an absorbent slurry for absorbing and removing sulfurous acid circulates, and means for feeding a treating agent into the circulating slurry in the cooling and dust collecting column, for making tetravalent Se insoluble, wherein the combustion exhaust gas is introduced directly into the cooling and dust collecting column, wherein the treating agent is selected from the group consisting of FeCl3,Fe2(SO4)3,chelating agent and a resin agent for capturing heavy metal. 11. A combustion exhaust gas treatment apparatus of claim 10, further comprising a wastewater treatment apparatus for treating wastewater from the desulfurization apparatus, and treating agent means for feeding a treating agent into the impurity slurry separated by this wastewater apparatus, for making tetravalent Se insoluble.