WO2006009079A1 - 排ガス中のガス状水銀除去方法及び除去装置 - Google Patents
排ガス中のガス状水銀除去方法及び除去装置 Download PDFInfo
- Publication number
- WO2006009079A1 WO2006009079A1 PCT/JP2005/013065 JP2005013065W WO2006009079A1 WO 2006009079 A1 WO2006009079 A1 WO 2006009079A1 JP 2005013065 W JP2005013065 W JP 2005013065W WO 2006009079 A1 WO2006009079 A1 WO 2006009079A1
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- WIPO (PCT)
- Prior art keywords
- exhaust gas
- solid catalyst
- contact surface
- ventilator
- contacts
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8665—Removing heavy metals or compounds thereof, e.g. mercury
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
- F23M9/003—Baffles or deflectors for air or combustion products; Flame shields in flue gas ducts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
- F23J2215/101—Nitrous oxide (N2O)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/60—Heavy metals; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/40—Sorption with wet devices, e.g. scrubbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Definitions
- the present invention relates to a method and apparatus for removing gaseous mercury in exhaust gas such as coal-fired exhaust gas and heavy oil-fired exhaust gas.
- Patent Document 1 discloses a technique in which HC1 and the like are sent to the upstream side of a denitration device and mercury is oxidized by the denitration device in an exhaust gas treatment device equipped with a denitration device and a wet desulfurization device.
- the wet desulfurization apparatus converts the water-insoluble mercury to water-soluble salt-molybdenum by contacting the exhaust gas with metal salt and soot upstream of the wet desulfurization apparatus.
- the technology to absorb in is disclosed.
- Patent Document 3 the wet desulfurization apparatus converts the water-insoluble mercury to water-soluble salty mercury by contacting the exhaust gas and the carrier carrying the catalyst upstream of the wet desulfurization apparatus.
- the technology to absorb in is disclosed.
- Patent Document 1 Japanese Patent Laid-Open No. 10-230137
- Patent Document 2 JP 2000-197811 A
- Patent Document 3 Japanese Patent Laid-Open No. 2003-053142
- the configuration in which a mercury oxidizer is provided upstream of the wet desulfurization system and the configuration in which the oxidizer is added to the wet desulfurization absorption liquid are configurations in which the oxidizer is directly input to the exhaust gas and waste water. May give. And if it becomes necessary to perform another process to reduce the impact on the environment, the burden of the process increases.
- a facility for injecting the oxidant is required, which increases the equipment cost.
- the present invention has been made in view of such circumstances, and is a method for removing gaseous mercury in exhaust gas, which is easy to handle, suppresses an increase in cost, and can favorably remove mercury in exhaust gas.
- An object is to provide a removal device.
- the method for removing gaseous mercury in exhaust gas comprises contacting a solid catalyst made of a metal oxide and an exhaust gas to form a water-insoluble solution in the exhaust gas. After converting mercury to water-soluble mercury, this water-soluble mercury is wet-absorbed.
- insoluble mercury contained in exhaust gas can be converted into water-soluble mercury using a metal oxide that is easy to handle.
- Mercury in the exhaust gas can be removed by wet absorption of water-soluble mercury.
- the exhaust gas is in contact with the exhaust gas.
- the solid catalyst is applied to a contact surface to be contacted, and the exhaust gas and the solid catalyst applied to the contact surface are contacted to convert water-insoluble mercury into water-soluble mercury. .
- the exhaust gas flowing through the flow path is contacted by applying a solid catalyst made of a metal oxide to the contact surface of the member disposed in the flow path (flue) where the exhaust gas flows with the exhaust gas.
- a solid catalyst made of a metal oxide
- the non-water-soluble mercury in the exhaust gas is converted into water-soluble mercury and then is well absorbed and removed.
- the solid catalyst is applied on the member, it is not necessary to install a solid catalyst on the surface of the existing equipment or member, so that the equipment cost can be reduced.
- the metal oxide as the solid catalyst is directly applied onto the member and is not supported on the carrier, the manufacturing process for manufacturing the catalyst can be reduced. Therefore, the manufacturing cost of the catalyst can be suppressed.
- an absorption device that wet-absorbs the water-soluble mercury is provided in the middle of the flow path, and the solid catalyst is in contact with a member upstream of the absorption device.
- the water-soluble mercury is wet-absorbed by the absorption device.
- water-insoluble mercury can be converted into water-soluble mercury upstream of the absorption device, and the water-soluble mercury after the conversion can be satisfactorily absorbed by the absorption device.
- the solid catalyst is a small amount of Fe 2 O, CuO, MnO, Al 2 O, and V 2 O.
- the apparatus for removing gaseous mercury in exhaust gas according to the present invention is provided in the middle of a flow path through which exhaust gas containing water-insoluble mercury flows, and includes an absorption device that wet-absorbs a predetermined substance in the exhaust gas.
- a solid catalyst made of a metal oxide is applied to a contact surface in contact with the exhaust gas among members upstream of the absorber, and the exhaust gas and the solid catalyst are brought into contact with each other, Converts water-insoluble mercury to water-soluble mercury, Mercury is wet-absorbed by the absorption device.
- the present invention it is possible to convert water-insoluble mercury contained in exhaust gas into water-soluble mercury using a metal oxide that is easy to handle.
- the exhaust gas flowing through the flow path is applied to the contact surface by applying a solid catalyst made of a metal oxide to the contact surface of the member disposed in the flow path (flue) where the exhaust gas flows with the exhaust gas. It can be contacted with the solid catalyst. Therefore, the water-insoluble mercury in the exhaust gas is converted into water-soluble mercury, and is then well absorbed by the absorption device and removed.
- the solid catalyst since the solid catalyst is applied on the member, the equipment cost can be reduced because no new equipment is required simply by applying the solid catalyst to the surface of the existing equipment or member. it can .
- the metal oxide as the solid catalyst is directly applied onto the member, and is not supported on the carrier, so that the manufacturing process for manufacturing the catalyst can be reduced. Therefore, the manufacturing cost of the catalyst can be suppressed.
- the absorption device includes a wet desulfurization device that wet-absorbs sulfur oxide in the exhaust gas.
- the wet desulfurization apparatus can efficiently absorb and remove both sulfur oxides and water-soluble mercury in the exhaust gas.
- the solid catalyst is also applied to a contact surface in contact with the exhaust gas in the absorber.
- water-insoluble mercury can be contacted with a solid catalyst and converted to water-soluble mercury, so that mercury can be absorbed more reliably. It is out.
- the contact surface includes a surface of a reinforcing member provided at an inlet portion of the exhaust gas with respect to the absorber, and the solid catalyst is also applied to the surface of the reinforcing member.
- the apparatus includes a plurality of devices that are disposed between a boiler that generates exhaust gas by burning fuel and the absorber, and that performs a predetermined process on the exhaust gas.
- the solid catalyst is coated on a contact surface of at least one device with the exhaust gas.
- the solid catalyst is applied to the contact surface with various devices constituting the apparatus for removing gaseous mercury in the exhaust gas, such as a heat recovery device, a ventilator, or an electric dust collector.
- various devices constituting the apparatus for removing gaseous mercury in the exhaust gas such as a heat recovery device, a ventilator, or an electric dust collector.
- the water-insoluble mercury contained in the exhaust gas generated by boiler boilers is converted to water-soluble mercury while passing through these devices, reaches the absorption device and is well absorbed and removed.
- the device includes a denitration device that removes nitrogen oxides in the exhaust gas, and the solid catalyst is applied to a contact surface in contact with the exhaust gas in the denitration device.
- the configuration may be adopted.
- the denitration apparatus may include a rectifying plate that regulates the flow of the exhaust gas, and the solid catalyst may be applied to the surface of the rectifying plate.
- the denitration apparatus may have a basket filled with a catalyst layer, and the solid catalyst may be applied to the surface of the current plate.
- the device includes an air preheater that preheats boiler combustion air using heat of exhaust gas, and the solid catalyst is applied to a contact surface of the air preheater that contacts the exhaust gas t, You can adopt this configuration.
- the device may include a heat recovery device that recovers heat of exhaust gas, and the solid catalyst may be applied to a contact surface that contacts the exhaust gas in the heat recovery device.
- the device may include a dust collector that collects dust in the exhaust gas, and the solid catalyst may be applied to a contact surface that contacts the exhaust gas in the dust collector.
- the dust collector may include a rectifying plate that regulates the flow of the exhaust gas, and the solid catalyst may be applied to the surface of the rectifying plate.
- the apparatus may include a ventilator that generates a flow of exhaust gas, and the solid catalyst may be applied to a contact surface that contacts the exhaust gas in the ventilator.
- the solid catalyst may be applied to the inner wall surface of the pipe line connecting the devices, the internal reinforcing member, and the current plate.
- FIG. 1 is a schematic configuration diagram showing an apparatus for removing gaseous mercury in exhaust gas according to an embodiment of the present invention.
- FIG. 2 is a schematic view showing a denitration apparatus in one embodiment of the present invention.
- FIG. 3 is a schematic diagram showing a heat recovery device and a reheater according to an embodiment of the present invention.
- FIG. 4A is a first schematic diagram showing a dust collector in an embodiment of the present invention.
- FIG. 4B is a second schematic diagram showing the dust collector in one embodiment of the present invention.
- FIG. 5 is a schematic diagram showing a ventilator according to an embodiment of the present invention.
- FIG. 6 is a schematic view showing a wet desulfurization apparatus in one embodiment of the present invention.
- FIG. 7 is a schematic view showing a reinforcing member attached to a wet desulfurization apparatus in one embodiment of the present invention.
- FIG. 8 is a diagram showing experimental results for confirming the effect of the method of the present invention.
- FIG. 9 is a schematic configuration diagram showing an apparatus for removing gaseous mercury in exhaust gas according to another embodiment of the present invention.
- FIG. 10 is a schematic configuration diagram showing an apparatus for removing gaseous mercury in exhaust gas according to still another embodiment of the present invention.
- FIG. 1 is a schematic configuration diagram of an apparatus for removing gaseous mercury in exhaust gas according to an embodiment of the present invention.
- a removal device S processes exhaust gas generated from the boiler 1 by burning fuel, and is provided downstream of the boiler 1 to remove nitrogen oxides (NOx).
- Device 2 and an air preheater 3 that is provided downstream of the denitration device 2 and heats boiler combustion air, a heat recovery device 4 that is provided downstream of the air preheater 3 and recovers heat, and a heat recovery device 4, an electric dust collector 5 that removes dust (particles) in the exhaust gas, an induction fan (fan) 6 provided downstream of the electric dust collector 5, and a predetermined substance in the exhaust gas.
- the exhaust gas treated by the removing device S is released from the chimney 10 into the atmosphere.
- the devices 2, 3, 4, 5, 6, 7, 8, and 9 that are arranged between the boiler 1 and the chimney 10 and perform various predetermined treatments on the exhaust gas are connected via a pipeline 11.
- the exhaust gas generated from the boiler 1 flows through a plurality of devices 2, 3, 4, 5, 6, 7, 8, 9 through the pipe 11 and is discharged from the chimney 10.
- the boiler 1 burns fuel to generate exhaust gas.
- the exhaust gas generated from boiler 1 contains nitrogen oxides (NOx), sulfur oxides (SOx), water-insoluble gaseous mercury (zero-valent mercury: Hg °), and halogenated hydrogen (HC1, etc.). include.
- Nitrogen oxides in the exhaust gas are removed by the denitration device 2.
- the denitration apparatus 2 in the present embodiment is a dry denitration apparatus, which injects a reducing agent such as ammonia into exhaust gas and reductively decomposes nitrogen oxides under the catalyst.
- FIG. 2 is a schematic diagram showing the denitration apparatus 2.
- the denitration device 2 includes a housing 21 and a catalyst layer 23 provided inside the housing 21.
- the inlet is connected to the boiler 1 via a pipeline 11A, and the outlet is connected to the air preheater 3 via a pipeline 11B.
- the catalyst layer 23 is formed by firing and firing a base metal oxide in, for example, a hard cam shape, filled in each of a plurality of baskets made of steel plates, and arranged in the housing 21.
- a rectifying plate 24 for adjusting the flow of exhaust gas from the boiler 1 can be provided in the housing 21.
- the catalyst layer 23 is not limited to a Herm cam shape, and may have any shape such as a plate shape.
- the air preheater 3 is a device for preheating boiler combustion air by using exhaust heat of exhaust gas, and is known as a tubular air preheater, plate air preheater, regenerative air preheater, etc.
- An air preheater can be used.
- a regenerative air preheater is a system in which air is heated by alternately contacting a heat transfer heat storage body composed of a large number of metal plates with exhaust gas and air.
- the heat recovery unit 4 recovers the heat of the exhaust gas and cools the exhaust gas.
- the recovered thermal energy is supplied to the reheater 8 .
- FIG. 3 is a schematic diagram showing the relationship between the heat recovery device 4 and the reheater 8.
- the heat recovery device 4 includes a housing 41 and a heat transfer member 43 that is provided inside the housing 41 and recovers heat by contacting exhaust gas.
- the nosing / housing 41 is provided with an inlet portion and an outlet portion with respect to the internal space of the housing 41.
- the inlet portion is connected to the air preheater 3 via a pipe line 11C, and the outlet part is connected to the pipe line. It is connected to the electrostatic precipitator 5 through 11D.
- the reheater 8 includes a housing 81 and a heat transfer member 83 that is provided inside the housing 81 and heats the exhaust gas by contacting the exhaust gas.
- Nozzle 81 has an inlet portion and an outlet portion for the internal space of the housing 81.
- the inlet portion is connected to the wet desulfurization device 7 via the pipe line 11E, and the outlet part is connected to the pipe line 11F. It is connected to the desulfurization ventilator 9 via
- Each of the heat transfer members 43 and 83 has an internal flow path through which the heat medium flows.
- the heat transfer member 4 3 (heat recovery device 4) and the heat transfer member 83 (reheater 8) It is connected via a flow path 12 through which the heat medium flows.
- a pump 13 for circulating a heat medium between the heat recovery device 4 and the reheater 8 is provided in the middle of the flow path 12, and the heat recovery device 4 and the reheater 8 use the heat medium as a medium.
- the heat energy is exchanged as follows.
- the heat recovery device 4 and the reheater 8 are directly connected to each other. It consists of a gas gas heater that exchanges heat.
- the electrostatic precipitator 5 removes solids such as particles (dust) in the exhaust gas.
- Figure 4A is a schematic diagram showing the electrostatic precipitator 5
- FIG. 4 B is a diagram showing the relationship between the discharge electrode and the dust collection electrode. 4A and 4B, the electrostatic precipitator 5 includes a housing 51, a discharge electrode 53 and a dust collection electrode 54 arranged inside the housing 51, and a current plate 56.
- the inlet part to the inner space of the woozing 51 is connected to the heat recovery device 4 through the pipe line 11G, and the outlet part is connected to the induction fan 6 through the pipe line 11H. .
- a hopper 55 is provided at the bottom of the housing 51.
- the electric dust collector 5 guides the exhaust gas to an electric field formed between the discharge electrode 53 and the dust collection electrode 54 and attracts particles in the exhaust gas to the dust collection electrode 54 by electric force to collect the dust.
- the particles adhering to the dust collecting electrode 54 are separated from the surface force of the dust collecting electrode 54 by the impact force of the hitting hammer (not shown), and fall to the hopper 55 to be collected.
- the electrostatic precipitator is not particularly limited as long as it can collect coarse dust before the exhaust gas is introduced into the wet desulfurization apparatus 7.
- the induction fan 6 guides the exhaust gas to the downstream side (wet deflow device 7 side), and as shown in FIG. 5, the casing 61 and the moving blades disposed inside the casing 61 With 63.
- the exhaust gas that has flowed into the casing 61 as well as the inlet force provided at one end of the casing 61 passes through the inside of the casing 61 by the driving of the rotor blades 63, and then exits from the outlet portion and is sent to the wet deflow device 7. It is done.
- the wet desulfurization apparatus 7 removes a predetermined substance such as sulfur oxides in the exhaust gas by absorbing it in a liquid.
- FIG. 6 is a diagram schematically showing the wet desulfurization apparatus 7.
- the wet-type de-flow device 7 is de-flowed and de-dusted by droplets (spray-like droplets) made of an alkaline absorbing liquid containing limestone. It is installed in the housing 71 and the upper part of the housing 71. And a spray nozzle 73 for supplying the absorbing liquid in the form of droplets (spray form).
- the inlet of the inner space of the wooding 71 is connected to the induction fan 6 via the pipe 11J, and the outlet is connected to the reheater 8 via the pipe 11K.
- the inlet portion is provided at the lower portion of the housing 71, and the outlet portion is provided at the upper portion of the housing 71.
- a reinforcing member 76 as shown in FIG. 7 is provided at the inlet of the housing 71.
- a mist eliminator 77 is provided at the exit.
- the wet desulfurization apparatus 7 is not particularly limited as long as it is a wet desulfurization apparatus generally used in flue gas treatment or a desulfurization apparatus in which a cooling tower is installed in front of the absorption tower.
- the spray tower has been described here, other forms such as a packed tower and a liquid column tower may be used.
- the inlet is provided at the lower part of the housing 71
- the outlet is provided at the upper part of the housing 71
- the inlet part is provided at the upper part of the housing
- the outlet part is provided at the lower part of the housing. It is also possible to adopt the configuration that has been adopted.
- the reheater 8 heats the exhaust gas whose temperature has been lowered by the thermal energy recovered by the heat recovery device 4. If the exhaust gas whose temperature has been lowered is discharged from the chimney 10 as it is, problems such as the generation of white smoke due to water vapor occur. However, the above problem can be prevented by heating the exhaust gas with the reheater 8. Then, the exhaust gas heated by the reheater 8 is released into the atmosphere from the chimney 10 by driving the desulfurization ventilator 9.
- each device disposed between the boiler 1 and the wet desulfurization apparatus 7, that is, upstream of the wet desulfurization apparatus 7 is provided.
- the denitration device 2, the air preheater 3, the heat recovery device 4, the electrostatic precipitator 5, the induction ventilator 6, and the pipe 11 that connects them are water-insoluble mercury in the exhaust gas.
- a solid catalyst made of a metal oxide that converts (zero-valent mercury: Hg °) into water-soluble mercury (divalent mercury: Hg 2+ ) is provided!
- a solid catalyst is also provided in a part of the wet desulfurization apparatus 7. Specifically, among the various members constituting a part of the devices 2 to 6 and 11 and the wet desulfurization device 7, the contact with the exhaust gas of the member disposed in the flow path (flue) through which the exhaust gas flows On the surface, a solid catalyst made of metal oxide is applied.
- the inner wall surface of the conduit 11, the inner wall surface 22 including the vicinity of the inlet and outlet portions of the housing 21 of the denitration device 2, the surface of the catalyst layer 23, and the bucket that supports the catalyst layer 23 A solid catalyst made of a metal oxide is applied to the surface, the surface of the rectifying plate 24, and the like.
- the air preheater 3 is a regenerative air preheater
- a solid catalyst made of a metal oxide is also applied to the inner wall surface of the housing constituting the air preheater 3, the heat transfer that is a metal plate force, etc. Is applied.
- a solid catalyst made of a metal oxide is applied to the inner wall surface 42 including the vicinity of the inlet and outlet portions of the housing 41 of the heat recovery unit 4, the surface of the heat transfer member 43 in contact with the exhaust gas, and the like. It has been.
- the inner wall surface 52 including the vicinity of the inlet and outlet portions of the housing 51 of the electric dust collector 5, the surface of the discharge electrode 53, the surface of the dust collecting electrode 54, the inner wall surface of the hopper 55, The surface and the like are also coated with a solid catalyst made of a metal oxide.
- a solid catalyst made of a metal oxide is applied to the inner wall surface 62 and the surface of the rotor blade 63 including the vicinity of the inlet and outlet of the casing 61 of the induction fan 6.
- a solid catalyst made of a metal oxide is also applied to the inner wall surface 72 including the vicinity of the inlet portion of the housing 71 of the wet desulfurization apparatus 7, the surface of the spray nozzle 73, the spray piping, and the like.
- the surface of the reinforcing member 76 is also coated with a solid catalyst made of a metal oxide.
- a solid catalyst that also has metal oxide strength may be applied to the inner wall surface 72 including the vicinity of the outlet portion of the housing 71.
- a solid catalyst made of a metal oxide may be applied to the inner wall surface of a pipe line constituting the circulation system 74.
- a solid catalyst made of a metal oxide may be applied to the surface of the mist eliminator 77.
- the solid catalyst to be applied includes a plurality of materials such as Fe 2 O, CuO, MnO, Al 2 O, and V 2 O.
- Nitrogen oxide is mainly removed by the denitration device 2, and sulfur oxide is mainly removed by the wet desulfurization device 7.
- the gaseous zero-valent mercury HgV- part contained in the exhaust gas is composed of water-soluble gaseous divalent mercury Hg 2+ and particulate (solid) water. Converted to silver Hg P. Particulate mercury Hg P is collected by the electrostatic precipitator 5.
- the wet mercury desulfurizer 7 has not been able to fully collect the particulate mercury Hg P. Can be recovered. Furthermore, the wet desulfurization apparatus 7 can also collect fine particles (dust) in the exhaust gas. Water-soluble divalent mercury Hg 2+ is wet-absorbed by the wet desulfurizer 7.
- the solid mercury HgP which has not been converted to particulate mercury Hg P or divalent mercury Hg 2+ , is brought into contact with a solid catalyst such as a metal oxide catalyst.
- Zero-valent mercury Hg ° is converted to water-soluble divalent mercury Hg 2+ and wet-absorbed by wet desulfurization equipment 7.
- the wet desulfurization device 7 wet-desulfurizes exhaust gas containing SOx and mercury with an alkali absorbing solution.
- water-insoluble zero-valent mercury Hg G contained in exhaust gas can be converted into water-soluble divalent mercury Hg 2+ using a metal oxide that is easy to handle.
- mercury in exhaust gas can be removed by wet absorption of water-soluble divalent mercury Hg 2+ .
- a metal is disposed on the contact surface of the member disposed in the flow path (flue) through which the exhaust gas flows with the exhaust gas.
- a solid catalyst made of oxide By applying a solid catalyst made of oxide, the exhaust gas flowing through the flow path can come into contact with the solid catalyst applied to the contact surface. Therefore, the water-insoluble zero-valent mercury Hg in the exhaust gas is converted into water-soluble divalent mercury Hg 2+ and is then well absorbed and removed.
- the solid catalyst is applied on the member, it is only necessary to apply the solid catalyst to the surface of the existing equipment, and no new equipment is required. Can be suppressed. Furthermore, the metal oxide as a solid catalyst is directly applied onto the member, and is not supported on the carrier, so that the manufacturing process for manufacturing the catalyst can be reduced. Therefore, the manufacturing cost of the catalyst can be suppressed.
- the wet desulfurization device 7 is provided in the middle of the flow path (flue), and the solid catalyst is in contact with the exhaust gas of a part of the wet desulfurization device 7 and a member upstream of the wet desulfurization device 7. Therefore, water-insoluble zero-valent mercury Hg can be converted into water-soluble divalent mercury Hg 2+ upstream of the wet desulfurization apparatus 7.
- the water-insoluble zero-valent mercury Hg ° contained in the exhaust gas generated from the boiler 1 is generated by the devices 2 to 6, 11, While passing through a part of the wet desulfurization device 7, it is converted to water-soluble divalent mercury Hg 2+ , reaches the wet desulfurization device 7 and is well absorbed and removed.
- FIG. 8 shows water-insoluble zero-valent mercury using Fe 2 O, which is a metal oxide according to this embodiment.
- FIG. 4 is a diagram showing experimental results obtained by converting Hg ° into water-soluble divalent mercury Hg 2+ . As shown in Fig. 8, by contacting Fe 2 O with exhaust gas, zero-valent mercury Hg G in the exhaust gas is water-soluble divalent.
- the wet desulfurization apparatus has been described as an example of an absorption apparatus for absorbing water-soluble mercury.
- water-soluble divalent mercury Hg 2+ can be absorbed and removed. If it is, it is not limited to the wet desulfurization apparatus, and any apparatus can be adopted.
- the Te embodiment Nio ⁇ although collected in electrostatic precipitator 5 particles (dust) containing particulate mercury Hg P, employ filtering dust collector such as a bag filter Also good. Smell in this case However, by applying or impregnating a solid catalyst made of a metal oxide into a filter through which exhaust gas permeates, a water-insoluble zero-valent mercury Hg is converted into a water-soluble divalent mercury Hg 2 Can be converted to + .
- the force described by taking the axial flow type ventilator as shown in the schematic diagram of Fig. 5 as an example of the ventilator is not limited to this, and for example, a centrifugal type ventilator It is also applicable to.
- a centrifugal ventilator the solid catalyst is applied to the surface of an impeller, for example.
- the reinforcing member 76 provided at the inlet portion of the housing 71 has been described as an example of the reinforcing member.
- the internal reinforcing member provided in the flow path through which the exhaust gas flows is described.
- the reinforcing member 76 is not limited to the reinforcing member 76 provided at the inlet of the housing 71.
- a reinforcing member may be provided at the outlet of the housing 71, and a solid catalyst may be applied to the surface of the reinforcing member.
- a reinforcing member is provided at a predetermined position inside the housing (casing) of each device 2, 3, 4, 5, 6, 7, 8, 9 or at a predetermined position inside the pipe 11, and this reinforcing member A solid catalyst may be applied to the surface.
- the electric dust collector 5 is provided between the heat recovery device 4 and the ventilator 6, but the installation position of the electric dust collector 5 is as shown in FIG. It is not limited to those shown in.
- the electric precipitator 5, the denitration device 2, the air preheater 3, the ventilator 6, the heat recovery device 4, the absorption device 7, and the reheater 8 are directed downstream from the boiler 1.
- the solid catalyst can be applied to the contact surface with the exhaust gas of the removing device S having such a configuration that may be arranged in the order of the chimney 10.
- the removal device S is a force removal device S in which the heat recovery device 4 and the reheater 8 exchange heat with a heat medium flowing in the flow path 12 as shown in FIG.
- the air preheater 3, the electrostatic precipitator 5, the ventilator 6, the gas gas heater 4 ', the absorber 7 and the ventilator 9 are arranged in this order from the boiler 1 to the downstream side.
- the gas gas heater 4 ' has both a function as a heat recovery unit that recovers the heat of the exhaust gas and a function as a reheater that reheats the gas discharged from the chimney 10.
- This is a configuration in which the vessel and the reheater are in a body. Even in such a configuration, for example, the solid catalyst can be applied to the contact surface of the gas gas heater 4 ′ with the exhaust gas.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/572,059 US7618604B2 (en) | 2004-07-15 | 2005-07-14 | Method and apparatus for removing gaseous mercury in flue gas |
EP05760172A EP1780466A4 (en) | 2004-07-15 | 2005-07-14 | METHOD AND APPARATUS FOR REMOVING GASEOUS MERCURY FROM EXHAUST GAS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-208567 | 2004-07-15 | ||
JP2004208567A JP4503378B2 (ja) | 2004-07-15 | 2004-07-15 | 排ガス中のガス状水銀除去方法及び除去装置 |
Publications (1)
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WO2006009079A1 true WO2006009079A1 (ja) | 2006-01-26 |
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PCT/JP2005/013065 WO2006009079A1 (ja) | 2004-07-15 | 2005-07-14 | 排ガス中のガス状水銀除去方法及び除去装置 |
Country Status (4)
Country | Link |
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US (1) | US7618604B2 (ja) |
EP (1) | EP1780466A4 (ja) |
JP (1) | JP4503378B2 (ja) |
WO (1) | WO2006009079A1 (ja) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5051977B2 (ja) * | 2005-01-31 | 2012-10-17 | バブコック日立株式会社 | 排ガス中微量有害物質の除去装置及びその運転方法 |
US8202482B2 (en) | 2006-07-26 | 2012-06-19 | Babcock-Hitachi Kabushiki Kaisha | Apparatus for removing of trace of toxic substance from exhaust gas and method of operating the same |
JP2008030017A (ja) * | 2006-07-26 | 2008-02-14 | Babcock Hitachi Kk | 排ガス中微量有害物質の除去装置及びその運転方法 |
JP5060776B2 (ja) * | 2006-12-04 | 2012-10-31 | 日立造船株式会社 | 排ガスからの水銀回収方法および装置 |
US7833501B2 (en) * | 2006-12-27 | 2010-11-16 | Babcock-Hitachi Kabushiki Kaisha | Method and apparatus for treating discharge gas |
KR100834451B1 (ko) | 2007-03-22 | 2008-06-09 | 주식회사 코캣 | 황화처리된 산화철을 이용한 수은 제거용 흡착제 및 이의제조방법 |
JP5144967B2 (ja) * | 2007-06-11 | 2013-02-13 | バブコック日立株式会社 | 排ガス処理システム |
KR100870758B1 (ko) | 2007-07-23 | 2008-11-26 | 한국에너지기술연구원 | 유동층보일러시스템의 연소배가스 처리공정 |
US20090252663A1 (en) * | 2008-04-02 | 2009-10-08 | Todd Marshall Wetherill | Method and system for the removal of an elemental trace contaminant from a fluid stream |
JP4905996B2 (ja) * | 2008-12-15 | 2012-03-28 | バブコック日立株式会社 | 水銀除去方法と装置 |
JP5877578B2 (ja) * | 2011-10-24 | 2016-03-08 | 太平洋セメント株式会社 | 燃焼排ガス処理装置及び処理方法 |
JP6489743B2 (ja) * | 2014-02-20 | 2019-03-27 | 三菱日立パワーシステムズ株式会社 | 水銀除去装置 |
CN104100994B (zh) * | 2014-07-04 | 2016-08-10 | 西安西热锅炉环保工程有限公司 | 一种基于烟气余热回收及再热技术的锅炉节能减排系统 |
CN104100964A (zh) * | 2014-07-16 | 2014-10-15 | 西安西热锅炉环保工程有限公司 | 一种实现火电厂烟气多污染物超低排放的协同脱除系统及方法 |
CN105465810A (zh) * | 2015-12-18 | 2016-04-06 | 广东粤电大埔发电有限公司 | 一种燃煤锅炉的烟气余热利用系统 |
CN107023852A (zh) * | 2016-07-11 | 2017-08-08 | 胡建廷 | 变容‑映射‑热媒烟气/空气换热装置 |
CN106225522A (zh) * | 2016-07-20 | 2016-12-14 | 杭州佰强能源科技有限公司 | 一种烟气与烟气换热器及换热系统 |
CN106287771B (zh) * | 2016-09-14 | 2018-06-22 | 西安热工研究院有限公司 | 一种燃煤电站锅炉烟气余热与水分联合回收利用系统 |
KR102178815B1 (ko) | 2019-05-09 | 2020-11-13 | 주식회사 지스코 | 환경설비 및 이를 포함하는 발전시스템 |
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Also Published As
Publication number | Publication date |
---|---|
JP4503378B2 (ja) | 2010-07-14 |
JP2006029673A (ja) | 2006-02-02 |
EP1780466A4 (en) | 2011-09-14 |
US20080008638A1 (en) | 2008-01-10 |
EP1780466A1 (en) | 2007-05-02 |
US7618604B2 (en) | 2009-11-17 |
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