Abstract: Provided are: an NOx removal unit to remove nitrogen oxide; an air preheater on a downstream side of the NOx removal unit to recover heat; a precipitator on a downstream side of the air preheater to remove ash dust; a gas-liquid contact type desulfurization unit on a downstream side of the precipitator to remove sulfur oxide; an SO3 removing agent supply unit to supply an SO3 removing agent at a supply unit on an upstream side of the precipitator; and a wet state processing unit between the air preheater and the supply unit to supply water to a flue gas to be made into a wet state; the wet state processing unit having a stand-up portion, a partition unit and a droplet supply unit.

Abstract: A cement solidification device for waste includes a slurrying vessel 14 that dissolves and slurries waste 11 containing harmful substances and deliquescent compounds in solvent water 12 to obtain slurried material 13; an iron-based additive supply unit 16 that adds an iron-based additive 15 to the slurrying vessel 14; a cement kneading vessel 20 that adds a cement solidifying agent 17 from a cement-solidifying agent supply unit 18 to the slurried material 13 in which the iron-based additive 15 is mixed to obtain a cement kneaded product 19; and a cement solidification unit 22 that cures the cement kneaded product 19 to form a cement solidified product 21.

Abstract: A heat exchanger includes a heat recovery unit that causes a heat medium to recover heat from flue gas through first heat exchange by bringing the flue gas into contact with a fin tube; a reheater including a preheating unit configured to preheat flue gas through second heat exchange by bringing the flue gas into contact with a tube, and heating units that heat the flue gas through third heat exchange by bringing the flue gas into contact with the heat medium; and a control unit that calculates a recovered heat quantity to be recovered by the heat recovery unit from the flue gas through the first heat exchange, and that controls temperature of the heat medium after the first heat exchange within a predetermined range.

Abstract: The air pollution control system including: a flue gas duct through which flue gas flows; a heat exchanger provided to the flue gas duct; a limestone supply device for reducing SO3 in the flue gas supplies CaCO3 to the flue gas flowing in an upstream of the heat exchanger; an upstream SO3 measurement device measures the SO3 in the flue gas flowing in a stream upper than a position where the limestone supply device supplies the CaCO3; and a control device determines a quantity supplied of the CaCO3 based on a relationship between a quantity of the SO3 measured by the upstream SO3 measurement device and a molar ratio of SO3 to CaCO3 and which supplies the determined quantity supplied of the CaCO3 from the limestone supply device to the flue gas duct.

Abstract: The air pollution control system including: a flue gas duct through which flue gas flows; a heat exchanger provided to the flue gas duct; a limestone supply device for reducing SO3 in the flue gas supplies CaCO3 to the flue gas flowing in an upstream of the heat exchanger; an upstream SO3 measurement device measures the SO3 in the flue gas flowing in a stream upper than a position where the limestone supply device supplies the CaCO3; and a control device determines a quantity supplied of the CaCO3 based on a relationship between a quantity of the SO3 measured by the upstream SO3 measurement device and a molar ratio of SO3 to CaCO3 and which supplies the determined quantity supplied of the CaCO3 from the limestone supply device to the flue gas duct.

Abstract: The water treatment system includes: a wet desulfurization device that removes sulfur oxide present in boiler flue gas; a dewatering device that separates gypsum from desulfurization waste water containing gypsum slurry; a reaction tank to which separated water from the dewatering device is introduced, and which immobilizes heavy metals present in the separated water by inputting a chelating agent; a solid-liquid separation unit that performs solid-liquid separation with respect to heavy metal sludge present in the separated water; a mixing unit that mixes the separated water obtained with effluent generated in a plant facility; a desalination device that removes salt content from the mixed water mixed by the mixing unit; and a spray drying device that includes a spray unit, which sprays concentrated water in which the salt content has been concentrated by the desalination device, and that performs spray drying using a part of the boiler flue gas.

Abstract: Provided are: an NOx removal unit to remove nitrogen oxide; an air preheater on a downstream side of the NOx removal unit to recover heat; a precipitator on a downstream side of the air preheater to remove ash dust; a gas-liquid contact type desulfurization unit on a downstream side of the precipitator to remove sulfur oxide; an SO3 removing agent supply unit to supply an SO3 removing agent at a supply unit on an upstream side of the precipitator; and a wet state processing unit between the air preheater and the supply unit to supply water to a flue gas to be made into a wet state; the wet state processing unit having a stand-up portion, a partition unit and a droplet supply unit.

Abstract: A water treatment system of the present invention for effluent generated in a plant facility includes: a flue gas treatment system that performs treatment of boiler flue gas from a boiler; and a spray drying device that includes a spraying unit, which sprays effluent generated, for example, in a cooler of the plant facility, and that performs spray drying using part of the boiler flue gas. The water treatment system draws the effluent is discharged into the spray drying device so as to dry the sprayed liquid by the part of the flue gas.

Abstract: A flue gas treatment system in which the desulfurization of an flue gas is attained by: catalytically converting SO2 contained in an flue gas into SO3; subjecting the SO3-containing flue gas to be heat exchanged with air in a heat exchanger to lower the temperature of the flue gas to a sulfuric acid dew point or lower; making dust adhere to the surfaces of sulfuric acid droplets contained in the flue gas; and collecting the sulfuric acid with dust together with dust by a dust collector.

Abstract: A flue gas desulfurization apparatus includes an absorption tower that absorbs sulfur oxide in a flue gas, and drift suppression members that are arranged near a bend portion of a purified gas exhaust passage arranged at an outlet portion of the absorption tower, the drift suppression members serving to collect mist particles.

Abstract: A flue gas desulfurization apparatus includes an absorption tower that absorbs sulfur oxide in a flue gas, and drift suppression members that are arranged near a bend portion of a purified gas exhaust passage arranged at an outlet portion of the absorption tower, the drift suppression members serving to collect mist particles.