WO2005056165A1 - 排ガス処理装置の性能回復方法 - Google Patents
排ガス処理装置の性能回復方法 Download PDFInfo
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- WO2005056165A1 WO2005056165A1 PCT/JP2003/015867 JP0315867W WO2005056165A1 WO 2005056165 A1 WO2005056165 A1 WO 2005056165A1 JP 0315867 W JP0315867 W JP 0315867W WO 2005056165 A1 WO2005056165 A1 WO 2005056165A1
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- catalyst
- exhaust gas
- performance
- honeycomb
- honeycomb catalyst
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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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
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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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2807—Metal other than sintered metal
- F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
- F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/04—Exhaust treating devices having provisions not otherwise provided for for regeneration or reactivation, e.g. of catalyst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/02—Fitting monolithic blocks into the housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/30—Removable or rechangeable blocks or cartridges, e.g. for filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49345—Catalytic device making
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
- Y10T29/49352—Repairing, converting, servicing or salvaging
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49721—Repairing with disassembling
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49732—Repairing by attaching repair preform, e.g., remaking, restoring, or patching
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49732—Repairing by attaching repair preform, e.g., remaking, restoring, or patching
- Y10T29/49734—Repairing by attaching repair preform, e.g., remaking, restoring, or patching and removing damaged material
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/1234—Honeycomb, or with grain orientation or elongated elements in defined angular relationship in respective components [e.g., parallel, inter- secting, etc.]
Definitions
- the present invention relates to a method for restoring the performance of an exhaust gas treatment apparatus using a honeycomb catalyst used for exhaust gas treatment of automobiles and other reactions such as gas purification or synthesis, particularly for use in flue gas denitration of thermal power plants and the like.
- flue gas denitration equipment that treats flue gas has been installed in power generation plants that use petroleum, coal, gas, etc., as well as in various types of large-scale poilers and other waste incinerators.
- the device contains a multi-layer denitration catalyst.
- the denitration catalyst generally, T io 2 etc. as the carrier, v with 2 0 5 and the like as the active ingredient, which oxides of tungsten and molybdenum is added as a co-catalyst component, VO x -WO y - T i 0 2 and VO x - M O_ ⁇ y - in the form of a composite oxide such as T i 0 2 is used.
- a honeycomb type or a plate type is used as the catalyst shape.
- a honeycomb type a honeycomb shape is manufactured from the base material, and then the coated component is coated with the catalyst component, the kneaded type is formed by kneading the catalyst component into the base material, and the honeycomb-shaped base material is impregnated with the catalyst component. And impregnated forms.
- the plate-like material is obtained by coating a metal core or ceramic with a catalyst component.
- a method of polishing the inner surface of an exhaust gas passage with a wear agent see Patent Document 1 and the like
- a method of shaving off the surface of a deteriorated denitration catalyst to ttj a new catalytically active surface see Patent Document 2 and the like
- Removes foreign matter by passing gas with body through through holes For example, a method of physically removing a deteriorated portion or a foreign substance to make an active surface appear has been studied.
- the method of physically polishing or the like has a problem that the operation is complicated and the denitration catalyst itself is cracked or destroyed by the regeneration operation. .
- the alkali component is removed by washing with an alkaline aqueous solution or hot water, and the heavy metal component mainly composed of vanadium is washed with an oxalic acid aqueous solution.
- cleaning is said to be effective, cleaning methods using various cleaning ingredients are still being studied, probably because of insufficient cleaning.
- Patent Literature 7 an apparatus that can regenerate the degraded catalyst function with the catalyst installed has been proposed (see Patent Literature 7).
- Patent Literature 7 an apparatus that can regenerate the degraded catalyst function with the catalyst installed has been proposed.
- this requires a new apparatus to be installed and construction is expensive. There is a problem that it becomes.
- Patent Document 1 Japanese Patent Application Laid-Open No. H11-119343 (Claims, etc.)
- Patent Document 2 Japanese Patent Application Laid-Open No. 197451/1992
- Patent Document 7 Japanese Patent Application Laid-Open No. 2000-325801 Disclosure of the invention
- the present invention considers the performance of an exhaust gas treatment device that can restore the denitration performance of a deteriorated denitration catalyst at low cost without replacing the deteriorated denitration catalyst and adding extra heat. It is an object to provide a recovery method.
- a first aspect of the present invention that solves the above-mentioned problems is an exhaust gas treatment in which a gas catalyst that has a gas flow path through which a gas to be treated is passed and that performs a process on a side wall of the gas flow path is provided in the exhaust gas flow path.
- a method for recovering the performance of an apparatus wherein a predetermined range from an upstream side in a flow direction of a gas to be treated of the honeycomb catalyst is set as a degraded portion, and the degraded portion is moved from an inlet side of the exhaust gas passage so as to be sufficiently moved.
- the method for recovering the performance of an exhaust gas treatment apparatus is characterized in that the exhaust gas treatment apparatus is redistributed.
- the honeycomb catalyst is rearranged so as to move the deteriorated portion of the honeycomb catalyst from the inlet side of the exhaust gas passage.
- a second aspect of the present invention is the exhaust gas treatment according to the first aspect, wherein the honeycomb catalyst is rearranged in a direction opposite to a flowing direction so that the deteriorated portion is located on the downstream side.
- the method is to recover the performance of the device.
- the honeycomb catalyst is rearranged in the exhaust gas treatment device so that the deteriorated portion is on the downstream side.
- the honeycomb catalyst is cut into a plurality of pieces along the flow direction, and the honeycomb catalyst is re-cut so that the deteriorated portion is not located at least on the most upstream side.
- the method for recovering the performance of an exhaust gas treatment device is characterized in that the device is disposed.
- a fourth aspect of the present invention is the performance recovery method for an exhaust gas treatment apparatus according to any one of the first to third aspects, wherein the honeycomb catalyst is rearranged in a state where the deteriorated portion is removed. .
- the deteriorated portion of the honeycomb catalyst is removed. This makes it possible to recover the performance of the denitration catalyst which is relatively easy and surely deteriorated.
- the range of the deteriorated portion on the side wall of the gas passage of the honeycomb catalyst is polished, and the honeycomb catalyst is rearranged.
- a feature of the invention is a method for restoring the performance of an exhaust gas treatment apparatus.
- the honeycomb catalyst when the honeycomb catalyst is rearranged in the exhaust gas treatment device, a range of a deteriorated portion generated on a side wall of the gas flow path is polished.
- the polishing rate can be made weaker than in the case of polishing the entirety, so that damage to the denitration catalyst can be reduced.
- the predetermined range is a range until a flow of exhaust gas sent into the gas flow path is rectified.
- a feature of the invention is a method for restoring the performance of an exhaust gas treatment apparatus.
- the predetermined range Lb (mm) is a force inflow velocity of Uins (m / s), and an arbitrary honeycomb diameter is Ly (mm). ), And when the honeycomb diameter constant Lys is 6 mm, the performance recovery method for an exhaust gas treatment device is characterized by being in a range specified by the following equation (A).
- 'L b a (L y ZL ys ⁇ 2 2 e 0 '. 3 5 (L y ' uin) ) (A)
- An eighth aspect of the present invention is directed to a performance recovery method for an exhaust gas treatment apparatus according to any one of the first to seventh aspects, wherein the catalyst is a catalyst for flue gas denitration.
- the honeycomb catalyst can be employed as a catalyst for flue gas denitration.
- a ninth aspect of the present invention is the regeneration method according to the eighth aspect, wherein the honeycomb catalyst is immersed in regenerated water at room temperature substantially without containing chlorine and a cleaning component, and then taken out and drained.
- the present invention relates to a method for recovering the performance of an exhaust gas treatment device characterized by being used together.
- the ninth aspect it is possible to easily elute and remove the inhibitory substance that reduces the denitration performance simply by immersing the denitration catalyst in substantially pure water at normal temperature, and to recover the denitration performance. it can. .
- the present invention is applicable to various honeycomb catalysts conventionally used.
- the honeycomb catalyst has a gas flow path having a polygonal cross section such as a square, a hexagon, or a triangle, and causes a catalytic reaction on a gas flow path wall surface, and is typically a hexagonal cross section.
- the whole is a cylindrical shape, or the whole having a gas flow path defined in a lattice shape with a square cross section is a square pillar shape, but is not limited thereto.
- the catalyst surface is coated with coal ash etc., and the reactant NH 3 (ammonia) or NO x approaches the catalyst. Since the adsorption of ammonia on the catalyst (reaction-limiting) is impeded, its performance is reduced.
- NH 3 ammonia
- NO x the reactant NH 3 (ammonia) or NO x approaches the catalyst. Since the adsorption of ammonia on the catalyst (reaction-limiting) is impeded, its performance is reduced.
- the deterioration of the honeycomb catalyst occurs in a predetermined range which is a range from the inlet side to the flow of the exhaust gas sent into the gas flow passage, and the downstream side of the range is hardly affected by the reaction. It is based on the finding that it does not contribute.
- the details of the specified ⁇ area L b (mm) will be described later, but the inflow velocity is U ins (m / s), the arbitrary honeycomb diameter is L y (mm), and the honeycomb diameter constant L ys It was also found that when the distance was set to 6 mm, the range was specified by the following equation (A).
- the honeycomb catalyst to which the present invention can be applied is The present invention can be applied to those having a length equal to or longer than the above-mentioned predetermined range, and preferably, at least about twice as long as the predetermined range that can be estimated by the above-described formula.
- the performance of the exhaust gas treatment device can be restored by performing a performance restoration process on the used and deteriorated denitration catalyst without replacing or adding a catalyst.
- the determination as to whether or not to perform the performance recovery process according to the method of the present invention may be performed periodically according to the service period of the denitration catalyst, but it is assumed that the deterioration period differs depending on the use conditions. Therefore, it is preferable to accurately grasp the state of deterioration of the denitration catalyst, and to perform a performance recovery process when the degree of deterioration exceeds a predetermined level.
- an inlet mole ratio considering the inlet NH 3 Bruno inlet NO x measured NOx removal efficiency 77, the denitration rate ⁇ It is preferable to evaluate the performance of the denitration catalyst based on the following. In such methods, to measure the vo chi concentration and Nyuita 3 concentration at the entrance of the denitration catalyst inlet mol Since the denitration rate ⁇ is measured in consideration of the ratio, the denitration rate that increases as the molar ratio increases can be absolutely and reliably evaluated.
- the denitration rate 77 may be measured based on the New Omicron chi concentration, but is preferably measured based on Nyuita 3 concentration. This is because measuring the denitration rate ⁇ based on the ⁇ 3 concentration instead of the ⁇ ⁇ concentration allows more stable grasp of the catalytic properties.
- the catalyst may be actually sampled from a part of the denitration catalyst and the performance of the sampled catalyst may be evaluated.
- the honeycomb catalyst of the present invention is not limited to a denitration catalyst such as an exhaust gas treatment device because the catalytic reaction is caused by its shape as described above.
- the present invention can be applied to any catalyst having a shape in which a substance which causes deterioration of the catalytic reaction is mixed in the catalyst or the reaction fluid.
- a deteriorated denitration catalyst is moved by moving a portion including a specific range from the gas inlet side of the used denitration catalyst from the inlet side of the exhaust gas passage of the exhaust gas treatment device.
- FIG. 1 is a diagram showing the internal flow of the honeycomb catalyst.
- FIG. 2 is a diagram showing the relationship between the turbulence sustaining distance and U in ⁇ Ly according to the simulation results.
- FIG. 3 is a diagram showing a relationship between a turbulent flow sustaining distance and a catalyst contamination distance in an actual apparatus.
- FIG. 4 is a diagram showing an example of a catalyst performance recovery process according to an embodiment of the present invention.
- FIG. 5 is a diagram showing a combination of cut catalysts according to an embodiment of the present invention.
- FIG. 6 is a diagram showing a cut-off state of the catalyst according to one embodiment of the present invention.
- FIG. 7 is a diagram showing a performance recovery process by a polishing process according to one embodiment of the present invention.
- FIG. 8 is a diagram showing a schematic configuration of an exhaust gas treatment apparatus using a denitration catalyst to which the method of the present invention is applied.
- FIG. 9 is a diagram showing the results of Test Example 4 of the present invention.
- FIG. 10 is a diagram showing the results of Test Example 5 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- the honeycomb catalyst when the honeycomb catalyst is deteriorated, as described above, mainly the predetermined range on the inlet side is deteriorated, and the other ranges are hardly deteriorated. Based on this finding, the affected part is relocated to move from the entrance side.
- FIG. 1 is a diagram showing a state of exhaust gas flowing inside a honeycomb catalyst based on a simulation result.
- the honeycomb catalyst 1 shown in FIG. 1 has a plurality of gas passages 1 A penetrating a substantially rectangular pillar-shaped structure in the longitudinal direction, and has a total size of 60 O mm X 6 It is assumed that the gas channel 1a is formed with a pitch of 7 mm and a honeycomb diameter of 6 mm.
- the exhaust gas enters the gas flow path 1A from a large space outside the honeycomb catalyst 1, the porosity is reduced from, for example, 1 to 0.64, and the exhaust gas is considerably disturbed. It passes through the wall (catalyst wall) of Road 1A. Ie The exhaust gas that entered the gas flow channel 1A was disturbed by friction with the catalyst wall ((A) in the figure), and the coal ash contained in the exhaust gas and NH 3 or NOX as a reactant collided with the wall. While passing ((B) in the figure).
- the exhaust gas is gradually rectified while passing through the gas flow path 1 A, and the NH 3 or NO x colliding with the wall surface is extremely reduced ((C) in the figure).
- NH 3 or NO x almost passes without contacting the wall ((D) in the figure). That is, after the exhaust gas is rectified, almost no denitration reaction is performed.
- the turbulence of gas in a general honeycomb catalyst depends on the inflow velocity ((V) in the figure) and the diameter of the gas channel of the honeycomb catalyst, but as shown in Fig. 1, a pitch of about 7 mm (honeycomb In the honeycomb catalyst 1 with a gas flow path of 1 A formed with a diameter of 6 mm, the turbulent flow area ((X) in the figure) extends from the gas inlet side to about 30 Omm, and the wall in that area is used for the denitration reaction. It is a part that greatly contributes.
- the following relationship could be estimated from the simulation results for the above-mentioned turbulence region.
- the gas temperature was set to 350 ° C using a honeycomb catalyst formed with a of 7 mm pitch and a honeycomb diameter of 6 mm.
- the turbulence duration refers to the point at which turbulence energy is lost when transitioning from turbulence to laminar flow.
- the turbulence duration distance Lts was determined to be 50, 80, and 1.80 mm, respectively.
- the turbulence sustaining region L ts (mm) is determined by the product of the inflow velocity U ins (m / s) and the honeycomb diameter Ly s (mm). Inflow velocity U ins and honeycomb diameter L ys as shown in And the turbulence duration distance Lts is required.
- the turbulence duration L ts when the honeycomb diameter Lys is 6 mm is specified by the following equation (1).
- the turbulent flow sustaining region Lt and the deteriorated portion of the actual device that is, the contamination range, which is a factor of catalyst deterioration.
- the results shown in Fig. 3 were obtained.
- the turbulence is long for the turbulence duration L t obtained from the above simulation, due to factors such as uneven inflow velocity and development of fluid turbulence. . '
- the constant a is a constant selected from the range of 3 to 5 when the inflow velocity is 6 m / s for a honeycomb catalyst having a honeycomb diameter of 6 mm (7 mm pitch).
- Lb a ⁇ Lt (3)
- Lt 8 Omm , A3.8, which corresponds to about 300 mm, which is the actual deteriorated part.
- the predetermined range until the exhaust gas is rectified in the honeycomb catalyst 1, that is, the range from the inlet side of the gas flow path 1A to about 300 mm is set.
- the used part was moved so that this part of the inlet side 30 O mm (hereinafter referred to as the deteriorated part) was moved from the inlet side of the exhaust gas passage of the exhaust gas treatment equipment.
- the performance of the exhaust gas treatment equipment will be restored by rearranging the honeycomb catalyst.
- to relocate the deteriorated part so as to move from the inlet side of the exhaust gas flow path means to remove the deteriorated part from the inlet side and place a part that has hardly deteriorated on the inlet side.
- the exhaust gas treatment device 10 includes a honeycomb catalyst 1 in the device main body 11, a gas introduction pipe 12 to be treated in one of the device main bodies 11, and an exhaust gas pipe 1 in the other. 3 is connected.
- the honeycomb catalyst 1 uses the part A as the inlet side and the part B as the outlet side, and it is assumed that a predetermined range on the part A side is the deteriorated part X.
- the strong honeycomb catalyst 1 is rearranged so that the direction of flow is reversed (hereinafter, also referred to as reverse arrangement).
- This reverse arrangement means that part B is on the inlet side and part A is on the outlet side.
- the honeycomb catalyst 1 may be reversed in the apparatus main body 11, but the gas introduction pipe 12 connected to the part A side and the exhaust gas pipe 13 connected to the part B side It is needless to say that the flow of the gas to be treated may be reversed by exchanging and connecting the gas and the effect is the same.
- the honeycomb catalyst is cut into a plurality of pieces along the flow direction, and the honeycomb catalyst is rearranged so that the deteriorated portion is not located at least on the most upstream side.
- the part A is used as the inlet side and the part B is used as the outlet side, and the predetermined range on the part A side is the deteriorated part X.
- the medium 1 is cut in half to obtain catalysts 1a and 1b, and the deteriorated part X is not located on the inlet side. What is necessary is just to rearrange it. That is, as shown in FIG. 5 (a), only the catalyst 1a including the deteriorated part X may be reversed and the part C may be arranged on the inlet side, or FIG. 5 (b) or As shown in (c), the catalyst 1b on the outlet side may be arranged on the inlet side, and various other rearrangements are conceivable.
- a deteriorated portion X may be arranged on the inlet side of the downstream catalyst 1a.
- FIGS. 5 (a) and 5 (c) It is preferable to arrange a site where no deterioration has occurred at the downstream inlet side.
- the honeycomb catalyst 1 may be cut into three or more pieces and rearranged. For example, the same effect can be expected if the honeycomb catalyst 1 is cut to a predetermined length at least equal to the deteriorated portion X. In the case of cutting longer than the deteriorated portion X, if the length is twice as long, there is an advantage that it can be reused by reversing the arrangement.
- part A is used as the entrance side and part B is used as the exit side, and the predetermined range on the part A side is considered to be the deteriorated part X.
- At least the deteriorated portion X of the fly catalyst 1 is cut off to obtain a catalyst 1c, and the catalyst 1c is used after being rearranged in the same direction or in the opposite direction.
- the length of the honeycomb catalyst becomes shorter than before recovery, but there is almost no problem in the performance because the range contributing to the exhaust gas treatment performance is almost the predetermined range on the inlet side. Therefore, when deterioration occurs again, the deteriorated portion can be further cut and removed.
- a method of polishing the area of the deteriorated portion of the side wall of the gas channel of the honeycomb catalyst and rearranging the honeycomb catalyst can be considered.
- a honeycomb catalyst is used in which site A is used as the inlet side and site B is used as the outlet side, and the predetermined range on site A is the deteriorated site X.
- Abrasive is applied only to the deteriorated part X of 1 by shot blasting etc. Rearrange this.
- the orientation at the time of rearrangement may be either as shown in Fig. 7 (a) or (b), but needless to say, the reverse performance of Fig. 7 (b) enables more sufficient performance recovery.
- a conventionally known polishing process can be used.However, in the method of the present invention, it is not necessary to polish the entire longitudinal direction of the gas flow path of the honeycomb catalyst 1 as in the conventional method. Since it is good, the polishing process can be realized relatively easily.
- the method of the present invention may be combined with a treatment for cleaning the honeycomb catalyst. That is, in the above-described first method, the honeycomb catalyst 1 may be washed and then arranged in the reverse direction. In the second method, after cutting, the catalyst 1a including the deteriorated portion X may be washed and used. Further, in the fourth method, the cleaning process may be performed before or after the polishing process, and preferably, the cleaning process may be performed after the polishing process.
- the washing treatment here is not particularly limited.
- a denitration catalyst particularly a denitration catalyst used in a flue gas denitration device of a coal-fired boiler
- regenerated water at room temperature containing substantially no chlorine and cleaning components.
- a washing treatment in which, for example, immersion in regenerated water is performed until the foaming is completed, and then taken out and drained.
- its catalytic activity can be sufficiently recovered only by immersion in pure water at room temperature, and the treated reclaimed water can be used repeatedly, and heavy metals are included in the treatment.
- water can be treated relatively easily because there is no water treatment.
- the above-described recovery process can be applied to the honeycomb catalyst arranged in each stage.
- the recovery process may be applied to the honeycomb catalysts arranged in all the stages, but if the deterioration state is grasped for each stage, the stage in which the deterioration is occurring is performed.
- the recovery treatment may be applied only to the catalyst of the present invention.
- the exhaust gas treatment apparatus 1OA is connected to the upstream side of the main unit 11A and communicates with the boiler unit of the thermal power plant.
- An exhaust gas flow path 110 is provided in the apparatus main body 11A, and a plurality of layers, in this embodiment, four layers of the denitration catalysts 14A to l 4D is arranged at a predetermined interval.
- Each of the denitration catalysts 14A to 14D is provided so that the exhaust gas introduced from the to-be-treated gas introduction pipe 12A sequentially passes through the exhaust gas channel 110, and is included in the exhaust gas by contacting the exhaust gas that has passed. It is to reduce nitrogen oxides (NO x ). NH 3 is injected into the target gas introduction pipe 12 A communicating with the boiler device according to the amount of exhaust gas from the boiler body.
- each denitration catalyst 14A-14D the shape and the like are not particularly limited, one general is of T I_ ⁇ 2, the honeycomb structure is V 2 0 5 as an active ingredient was used as the carrier .
- a plurality of pillar-shaped honeycomb-type denitration catalysts 1.4 having a plurality of gas flow paths 14a penetrating the lengthwise direction in a substantially quadrangular prism-shaped structure are arranged side by side and combined.
- a denitration catalyst 14 A to 14 D is constituted.
- Each of the denitration catalysts 14 has a length of 860 mm and a plurality of gas passages 14a formed at a pitch of 7 mm, and corresponds to the honeycomb catalyst 1 shown in FIG.
- the interval between the denitration catalysts 14A to 14D is about 200 Omm, which is a height that can be inspected by humans or a height at which a sample catalyst can be taken out.
- gas inlet stages 15A to 15E are provided on the inlet side and outlet side of each of the denitration catalysts 14A to 14D, and the gas sampling means 15A to 15E and concentration of NO x measurement means 1'6A ⁇ 16E respectively, NH 3 is connected to the concentration measurement means 17A ⁇ 17 E, these measurements, the denitration rate ⁇ Pi denitration burden of each NO x removal catalyst. 14A to 14 D It is collected to the denitration rate measuring means 18 which calculates
- Gas sampling means 15A ⁇ 15E a desired amount of sample gas is collected through a sampling tube, the collected sample gas concentration of NO x at a desired timing These are supplied to the measuring means 16 A to 16 E and the NH 3 concentration measuring means 17 A to 17 E.
- Gas sampling means The sampling gas sampling by means of 15A to 15E is not particularly limited, but is preferably performed during normal operation of the power plant, and preferably at the rated load that maximizes the gas volume. Even if the gas sampling interval is about 6 months at the maximum, it is enough to control the performance of the denitration catalysts 14A to 14D.However, if the frequency is increased, the control accuracy will be improved. It is preferable to do this about once a month.
- the NH 3 concentration decreases and the fluctuation range increases. Therefore, in order to improve the management evaluation, the number of measurements of the NH 3 concentration is increased and the denitration rate is obtained from the average concentration. It is preferable to do so.
- the denitration rate measuring means 1 8 obtains the measurement results from the concentration of NO x measurement means 1 6 A to 1 6 E and NH 3 concentration measurement means 1. 7A to 1 7 E, the denitration catalyst from these measurement results It calculates the denitration rates and denitration burden rates of 14A to 14D.
- the denitration rate 77 based on the NH 3 concentration is calculated based on the following equation (4). .
- the evaluation mole ratio is a mole ratio set for evaluating the denitration catalyst, and any mole ratio can be set. For example, it may be set to about the operating molar ratio of a power plant, for example, 0.8.
- test piece 2 installed here corresponds to the state of the honeycomb catalyst 1c after recovery shown in FIG. That is, it corresponds to the honeycomb catalyst 1c in which the deteriorated portion is removed and rearranged in the same direction.
- Table 1 shows a comparison of the measurement results of Test Examples 1 to 3 and Comparative Test Examples.
- a new control in addition to the comparative test examples, a new control
- Table 1 also shows the denitration ratios 77 based on extrapolated values obtained by measuring the interval between ⁇ to 500 mm in increments of 100 mm and extrapolating by the least squares method.
- the inflow velocity inside the honeycomb was 6 m / sat 360 ° C, and the catalyst length (test piece length ) Is 600mm, 3 ⁇ value is 99001/11, AV value is 23.3m3 N / m ⁇ Molar ratio is 0.82, and gas temperature is 360 ° C.
- the performance recovery rates calculated based on are compared. The results are shown in Table 2 and FIG.
- the performance recovery rate of the new control product is based on the outside value, as in Test Example 3, and also applies to the test piece length of 500 mm separately from the test piece length of 60 Omm. Was calculated.
- the present invention is applied to all catalysts having a shape in which a reacting fluid passes through the inside of a honeycomb and reacts, and further to all catalysts having a shape in which a substance which deteriorates a catalytic reaction is mixed into the reaction fluid. It is possible.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003289030A AU2003289030A1 (en) | 2003-12-11 | 2003-12-11 | Method for restoring performance capabilities of exhaust gas treatment apparatus |
CNB2003801109707A CN100431672C (zh) | 2003-12-11 | 2003-12-11 | 废气处理装置的性能恢复方法 |
CA002548444A CA2548444C (en) | 2003-12-11 | 2003-12-11 | Method for restoring performance capabilities of exhaust gas treatment apparatus |
US10/582,402 US7441332B2 (en) | 2003-12-11 | 2003-12-11 | Method for restoring performance capabilities of exhaust gas treatment apparatus |
EP03778811.4A EP1693100B1 (en) | 2003-12-11 | 2003-12-11 | Method for restoring performance capabilities of exhaust gas treatment apparatus |
JP2005511673A JP4476222B2 (ja) | 2003-12-11 | 2003-12-11 | 排ガス処理装置の性能回復方法 |
PCT/JP2003/015867 WO2005056165A1 (ja) | 2003-12-11 | 2003-12-11 | 排ガス処理装置の性能回復方法 |
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PCT/JP2003/015867 WO2005056165A1 (ja) | 2003-12-11 | 2003-12-11 | 排ガス処理装置の性能回復方法 |
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WO2005056165A1 true WO2005056165A1 (ja) | 2005-06-23 |
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PCT/JP2003/015867 WO2005056165A1 (ja) | 2003-12-11 | 2003-12-11 | 排ガス処理装置の性能回復方法 |
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US (1) | US7441332B2 (ja) |
EP (1) | EP1693100B1 (ja) |
JP (1) | JP4476222B2 (ja) |
CN (1) | CN100431672C (ja) |
AU (1) | AU2003289030A1 (ja) |
CA (1) | CA2548444C (ja) |
WO (1) | WO2005056165A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7862635B2 (en) * | 2007-02-12 | 2011-01-04 | Gm Global Technology Operations, Inc. | Shielded regeneration heating element for a particulate filter |
US7875102B2 (en) * | 2008-04-02 | 2011-01-25 | Corning Incorporated | Method for managing the use of flow-through monolithic sorbents for the sorption of a trace contaminant from a fluid stream |
JP2011161373A (ja) * | 2010-02-09 | 2011-08-25 | Chugoku Electric Power Co Inc:The | 脱硝触媒の再生方法 |
WO2015075793A1 (ja) * | 2013-11-20 | 2015-05-28 | ボルボ ラストバグナー アクチエボラグ | 排気浄化装置及びその再生方法 |
WO2017022582A1 (ja) * | 2015-07-31 | 2017-02-09 | 中国電力株式会社 | 脱硝触媒の劣化評価方法 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2003292823A1 (en) * | 2002-12-27 | 2004-07-29 | The Chugoku Electric Power Co., Inc. | Honeycomb catalyst, denitration catalyst of denitration device, and exhaust gas denitration device |
CA2571044C (en) * | 2004-06-28 | 2010-10-26 | The Chugoku Electric Power Co., Inc. | Method of testing denitration catalyst |
EP2164596A4 (en) * | 2007-07-05 | 2012-09-26 | Carrier Corp | FLUID CLEANING DEVICE WITH NON-LAMINARY FLOW STRUCTURE |
JP6981156B2 (ja) * | 2017-10-02 | 2021-12-15 | いすゞ自動車株式会社 | 内燃機関の排気浄化装置 |
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- 2003-12-11 CN CNB2003801109707A patent/CN100431672C/zh not_active Expired - Fee Related
- 2003-12-11 JP JP2005511673A patent/JP4476222B2/ja not_active Expired - Lifetime
- 2003-12-11 CA CA002548444A patent/CA2548444C/en not_active Expired - Fee Related
- 2003-12-11 WO PCT/JP2003/015867 patent/WO2005056165A1/ja active Search and Examination
- 2003-12-11 US US10/582,402 patent/US7441332B2/en not_active Expired - Fee Related
- 2003-12-11 EP EP03778811.4A patent/EP1693100B1/en not_active Expired - Lifetime
- 2003-12-11 AU AU2003289030A patent/AU2003289030A1/en not_active Abandoned
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US7862635B2 (en) * | 2007-02-12 | 2011-01-04 | Gm Global Technology Operations, Inc. | Shielded regeneration heating element for a particulate filter |
US7875102B2 (en) * | 2008-04-02 | 2011-01-25 | Corning Incorporated | Method for managing the use of flow-through monolithic sorbents for the sorption of a trace contaminant from a fluid stream |
JP2011161373A (ja) * | 2010-02-09 | 2011-08-25 | Chugoku Electric Power Co Inc:The | 脱硝触媒の再生方法 |
WO2015075793A1 (ja) * | 2013-11-20 | 2015-05-28 | ボルボ ラストバグナー アクチエボラグ | 排気浄化装置及びその再生方法 |
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Also Published As
Publication number | Publication date |
---|---|
EP1693100A4 (en) | 2008-03-19 |
CN100431672C (zh) | 2008-11-12 |
CN1886185A (zh) | 2006-12-27 |
US20070119053A1 (en) | 2007-05-31 |
EP1693100B1 (en) | 2014-02-12 |
CA2548444A1 (en) | 2005-06-23 |
EP1693100A1 (en) | 2006-08-23 |
JP4476222B2 (ja) | 2010-06-09 |
US7441332B2 (en) | 2008-10-28 |
JPWO2005056165A1 (ja) | 2007-08-23 |
AU2003289030A1 (en) | 2005-06-29 |
CA2548444C (en) | 2009-09-01 |
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