摘要:
In an exhaust gas treatment, the amount of a highly corrosive mercury-halogenating agent to be added is reduced with the mercury-removing efficiency maintained high.A mercury-halogenating agent (40) and ammonia (30) are added to combustion exhaust gas from a boiler, the exhaust gas containing NOx, SOx and mercury. The exhaust gas is brought into contact with a CO/HC oxidation catalyst (50) and is then subjected to reduction denitration (60) in the presence of a solid catalyst. Thereafter, metallic mercury is oxidized to halogenated mercury. Then, the exhaust gas is wet-desulfurized (100) with the alkaline absorbing solution, and the halogenated mercury is removed.
摘要:
An air pollution control apparatus according to the present invention reduces nitrogen oxides and oxidizes mercury in flue gas 16 discharged from a boiler by an ammonia denitrating catalyst. The air pollution control apparatus includes an economizer bypassing unit 15a that diverts high-temperature combustion gas 11 to a downstream side while bypassing an economizer 15 provided in a gas flue 10a for combustion gas 11 from the boiler, provided with an ammonium-chloride supply unit 101 that supplies powdery ammonium chloride (NH4Cl) to the economizer bypassing unit 15a. The air pollution control apparatus sublimates the ammonium chloride in an atmosphere at a high temperature of the combustion gas 11, and supplies hydrogen chloride and ammonium into the flue gas flue 102.
摘要:
In an exhaust gas treatment, the amount of a highly corrosive mercury-halogenating agent to be added is reduced with the mercury-removing efficiency maintained high.A mercury-halogenating agent (40) and ammonia (30) are added to combustion exhaust gas from a boiler, the exhaust gas containing NOx, SOx and mercury. The exhaust gas is brought into contact with a CO/HC oxidation catalyst (50) and is then subjected to reduction denitration (60) in the presence of a solid catalyst. Thereafter, metallic mercury is oxidized to halogenated mercury. Then, the exhaust gas is wet-desulfurized (100) with the alkaline absorbing solution, and the halogenated mercury is removed.
摘要:
An air pollution control apparatus according to the present invention reduces nitrogen oxides and oxidizes mercury in flue gas 16 discharged from a boiler by an ammonia denitrating catalyst. The air pollution control apparatus includes an economizer bypassing unit 15a that diverts high-temperature combustion gas 11 to a downstream side while bypassing an economizer 15 provided in a gas flue 10a for combustion gas 11 from the boiler, provided with an ammonium-chloride supply unit 101 that supplies powdery ammonium chloride (NH4Cl) to the economizer bypassing unit 15a. The air pollution control apparatus sublimates the ammonium chloride in an atmosphere at a high temperature of the combustion gas 11, and supplies hydrogen chloride and ammonium into the flue gas flue 102.
摘要:
An exhaust gas treating apparatus removes nitrogen oxides and mercury in exhaust gas from a boiler using an ammonia denitration catalyst, including: an ammonium chloride powder feed unit for feeding ammonium chloride, in powder form, into a vicinity of an entrance of an economizer provided to a combustion gas flue of the boiler and/or an economizer bypass unit, the fed ammonium chloride in powder form being sublimed by a combustion gas, to thereby feed hydrogen chloride and ammonia into the flue; and an ammonium chloride liquid feed unit for feeding ammonium chloride, in liquid form, into a vicinity of the entrance of the economizer and/or the economizer bypass unit, the ammonium chloride liquid feed unit also being capable of feeding ammonium chloride, vaporization of the fed ammonium chloride in liquid form by the combustion gas also allowing hydrogen chloride and ammonia to be fed into the flue.
摘要:
An exhaust gas treating apparatus removes nitrogen oxides and mercury in an exhaust gas from a boiler by use of an ammonia denitration catalyst, the exhaust gas treating apparatus including: an ammonium chloride powder feed unit 101 for feeding ammonium chloride, in powder form, into any one of or both of a vicinity of an entrance of an economizer 15 provided to a combustion gas flue of the boiler and an economizer bypass unit 15a, the fed ammonium chloride in powder form being sublimed by a combustion gas, to thereby feed hydrogen chloride and ammonia into the flue 102; and an ammonium chloride liquid feed unit 110 for feeding ammonium chloride, in liquid form, into any one of or both of a vicinity of the entrance of the economizer 15 and the economizer bypass unit 15a, the ammonium chloride liquid feed unit 110 also being capable of feeding ammonium chloride, vaporization of the fed ammonium chloride in liquid form by the combustion gas also allowing hydrogen chloride and ammonia to be fed into the flue 102.
摘要:
An apparatus for separating and recovering CO2 from a CO2 absorbent, includes: a regeneration tower for regenerating the absorbent that has absorbed CO2 by heating it to separate and remove CO2 therefrom and to exhaust CO2 gas; a compressor for compressing the CO2 gas exhausted from the tower; and a heat exchanger for heating the absorbent in the tower by exchanging heat with a part of the compressed CO2 by the compressor which is introduced into the tower. The apparatus may include a plurality of the compressors and a plurality of the heat exchangers. The plurality of compressors is arranged in series to sequentially compress the CO2 gas exhausted from the tower. The plurality of heat exchangers is configured so that each part of the CO2 compressed by the plurality of compressors is introduced to the tower in parallel to exchange heat with the absorbent in the tower.
摘要:
Coal is properly dried and the efficiency of a boiler is increased while suppressing any reduction in efficiency of the boiler and the generation of hydrocarbon gas components. Employed are a coal dryer that dries coal, a boiler in which the coal that is dried in the coal dryer is mixed with air for combustion and burned, an air heater that heats the air for combustion that is supplied to the boiler using combustion exhaust gas discharged from the boiler, a precipitator that collects dust included in the combustion exhaust gas, a desulfurization plant that performs a desulfurization process on the combustion exhaust gas, and heat recovery equipment that heats a heating medium using the combustion exhaust gas. The coal dryer dries the coal using the heat energy of the heating medium that has been heated in the heat recovery equipment.
摘要:
A flue gas control system of a coal combustion boiler according to the present invention includes: an HCI atomizer (32) that sprays hydrogen chloride (33) to flue gas from a coal combustion boiler (11) that uses coal as a fuel (F); NOx removing apparatus (13) that removes nitrogen oxides by ammonia denitration by adding ammonia (12) to the flue gas after spraying hydrogen chloride and oxidizes mercury; an air preheater (14) that recovers heat in the gas after removal of nitrogen oxides; a precipitator (15) that removes particulates in the gas; an activated carbon atomizer (22) that sprays activated carbon (22a) into the gas after particulate collection; a bag filter (21) that collects activated carbon having adsorbed mercury; a desulfurizer (16) that removes sulfur oxides in the flue gas after removal of activated carbon; a stack (17) that discharges the gas which has undergone desulfurization to outside; and an ORP meter (19) that measures an oxidation reduction potential for feeding air to a slurry absorbent in the desulfurizer (16).
摘要:
The present invention provides a mercury removal system and method for effectively removing a mercury component, which is present in a gas stream in an extremely small amount in wet gas cleaning. The mercury removal system in wet gas cleaning includes a water washing tower for introducing therein a target gas containing a mercury component and transferring the mercury component into an absorbing solution, a flash drum (10) for flashing the absorbing solution discharged from the water washing tower to separate the absorbing solution into a gas component and waste water, an oxidation treatment means (1) for adding an oxidizing agent to the absorbing solution at the preceding stage of the flash drum, and a waste water treatment means for subjecting to coagulation sedimentation treatment the separated waste water containing the mercury component at the following stage of the flash drum to dispose of the mercury component as sludge.