WO2018109904A1 - 使用済み脱硝触媒の再生方法 - Google Patents
使用済み脱硝触媒の再生方法 Download PDFInfo
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- WO2018109904A1 WO2018109904A1 PCT/JP2016/087397 JP2016087397W WO2018109904A1 WO 2018109904 A1 WO2018109904 A1 WO 2018109904A1 JP 2016087397 W JP2016087397 W JP 2016087397W WO 2018109904 A1 WO2018109904 A1 WO 2018109904A1
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- denitration catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/60—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using acids
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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
- B01D53/8621—Removing nitrogen compounds
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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
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/20—Vanadium, niobium or tantalum
- B01J23/22—Vanadium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/28—Molybdenum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/90—Regeneration or reactivation
- B01J23/92—Regeneration or reactivation of catalysts comprising metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/60—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using acids
- B01J38/62—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using acids organic
Definitions
- the present invention relates to a method for regenerating used denitration catalyst. More specifically, the present invention relates to a method for regenerating a used denitration catalyst that has deteriorated due to adhesion of a compound containing Si, Al, or Ca.
- Patent Document 1 discloses a method for regenerating a denitration catalyst that includes removing a surface layer of a pellet-shaped denitration catalyst by using a rotating drum and then washing with water.
- Patent Document 2 discloses a method for regenerating a catalyst, which includes uniformly dispersing particles harder than a catalyst in a gas flow path of a plate-like or honeycomb-like catalyst and scraping the surface of the catalyst thinly.
- Patent Document 3 discloses a dry regeneration method of a catalyst including grinding a deteriorated catalyst formed in a number of cylinders, honeycombs, or a number of plates with a brush, sandpaper, file, silica sand, or the like.
- Patent Document 4 discloses a denitration catalyst regeneration method that includes physically removing dust components from the surface of the honeycomb catalyst and then impregnating the catalyst active components. The dust component is removed by directly cleaning the inside of each hole (cell) of the honeycomb catalyst with a brush, removing with air blow or sand blasting, or using water or ultrasonic cleaning as appropriate. 4 states.
- Patent Document 5 discloses a method for regenerating a denitration catalyst, which comprises washing the catalyst with an aqueous solution of a fluoride salt, and further washing with an aqueous solution containing a vanadium compound and / or a tungsten compound.
- Patent Document 6 discloses a method for regenerating a denitration catalyst, which includes treating and removing a catalyst accumulation substance with an aqueous alkaline solution and then treating with an aqueous acid solution.
- Patent Document 7 describes a method in which a denitration catalyst whose activity is reduced due to adhesion of silica, alumina, or calcium sulfate is washed with water and then hydrated, and then silica, alumina, or calcium sulfate is mixed at room temperature using a mixture of organic acid and fluoride. Disclosed is a method for improving the activity of a denitration catalyst comprising washing and removing.
- the regeneration method of a denitration catalyst using a chemical solution such as mineral acid aqueous solution, fluoride aqueous solution, or alkaline aqueous solution may require neutralization after chemical solution cleaning, degrading the denitration catalyst aggregate, etc., and reducing the strength of the catalyst
- a chemical solution such as mineral acid aqueous solution, fluoride aqueous solution, or alkaline aqueous solution
- the regeneration method of the denitration catalyst by physical removal with a brush or the like has a problem that the ash component or the like tends to remain in a place where the brush does not reach.
- the conventional reproduction method has advantages and disadvantages in terms of practical use.
- An object of the present invention is to provide a method for regenerating a used denitration catalyst that has deteriorated due to adhesion of a compound containing Si, Al, or Ca.
- a compound comprising a plate having alternating flat portions and linear spacer portions, and a catalyst layer containing as a main component titanium oxide supported on the plate, and containing Si, Al, or Ca by flue gas denitration treatment Rub the surface of the plate-shaped denitration catalyst element with a brush in a state where water or an acid aqueous solution is adhered to the surface of the plate-shaped denitration catalyst element to which A method for regenerating a used denitration catalyst, comprising impregnating a plate-shaped denitration catalyst element rubbed with a brush with a liquid containing a catalytically active component.
- a plate-like denitration catalyst element comprising a plate having alternating flat portions and linear spacer portions, a catalyst layer containing titanium oxide supported on the plate as a main component, and a certain plate-like denitration Smoke is exhausted by a catalyst unit comprising a unit frame that can stack and store a plurality of plate-shaped denitration catalyst elements so that the linear spacer portions of other plate-shaped denitration catalyst elements adjacent to the flat portion of the catalyst element abut Denitration treatment, A plate-shaped denitration catalyst element to which a compound containing Si, Al or Ca is adhered by the flue gas denitration treatment is taken out from the catalyst unit, Rub the surface of the plate-shaped denitration catalyst element with a brush with water or an acid aqueous solution attached to the surface of the plate-shaped denitration catalyst element taken out from the catalyst unit, A method for regenerating a used denitration catalyst, comprising impregnating a plate-shaped denitration catalyst element rubbed with a brush with a liquid containing
- the regeneration method of the present invention can recover a used denitration catalyst that has deteriorated due to adhesion of a compound containing Si, Al, or Ca to the same denitration performance as before use without reducing the strength.
- the number of repeated uses of the denitration catalyst can be significantly increased.
- the method of regenerating a used denitration catalyst according to the present invention comprises rubbing the surface of the plate-shaped denitration catalyst element with a brush in a state where water or an acid aqueous solution is adhered to the surface of the used plate-shaped denitration catalyst element. And impregnating the plate-shaped denitration catalyst element with a liquid containing a catalytically active component.
- the plate-shaped denitration catalyst element 1 used in the present invention is composed of a plate material and a catalyst layer supported on the plate material.
- the plate material has flat portions 4 and linear spacer portions 3 alternately.
- the plate material can be manufactured from a flat original plate such as a metal lath or a non-woven fabric.
- the linear spacer portion can be formed by press-bending a flat original plate.
- the shape of the linear spacer is not particularly limited as long as it can secure a space through which gas can pass when a plurality of plate-shaped denitration catalyst elements are stacked. Examples of the shape of the linear spacer portion include a shape in which a pair of convex stripes and concave stripes as shown in FIG.
- the catalyst layer contains titanium oxide as a main component and further contains a catalytically active component as necessary.
- the catalytically active component is not particularly limited as long as it can enhance the denitration performance.
- Preferable catalytically active components include those containing at least one element selected from the group consisting of vanadium, molybdenum, and tungsten.
- the plate-shaped denitration catalyst element 1 used in the present invention is one in which a compound containing Si, Al, or Ca is adhered by flue gas denitration treatment.
- the flue gas denitration treatment include a method using ammonia or urea.
- the flue gas denitration treatment is preferably performed using a catalyst unit.
- FIG. 1 shows an example of the catalyst unit.
- the catalyst unit 7 includes a plurality of plate-shaped denitration catalyst elements 1 in a unit frame 6, a flat portion of one plate-shaped denitration catalyst element, and a linear spacer portion of another plate-shaped denitration catalyst element adjacent to each other. However, they are stacked and stored so that they come into contact with each other.
- the plate-like denitration catalyst element to which the compound containing Si, Al or Ca is attached is removed from the unit frame by the flue gas denitration treatment.
- the surface of the plate-like denitration catalyst element is rubbed with a brush.
- a brush water or an acid aqueous solution, more preferably a sulfamic acid aqueous solution or an organic acid aqueous solution, more preferably a sulfamic acid aqueous solution, an oxalic acid aqueous solution or a citric acid aqueous solution is attached to the surface of the plate-shaped denitration catalyst element.
- the adhering compound or acid salt containing Si, Al or Ca is removed.
- the plate-shaped denitration catalyst element can be immersed in water or an aqueous acid solution; the plate-like denitration catalyst element can be sprayed, sprayed, or the like.
- an aqueous acid solution more preferably an aqueous sulfamic acid solution or an organic acid aqueous solution, more preferably an aqueous sulfamic acid solution, an oxalic acid aqueous solution, or an aqueous citric acid solution is used from the viewpoint of removal efficiency.
- the acid concentration is preferably 0.1 to 10% by mass.
- the temperature is not particularly limited, but is usually 10 to 80 ° C.
- the temperature is usually 10 to 80 ° C., although the optimum range is slightly different depending on the type of acid.
- the optimum temperature of the acid aqueous solution is, for example, preferably 40 to 80 ° C. in the case of an oxalic acid aqueous solution or citric acid aqueous solution, and preferably 60 ° C. or less in the case of a sulfamic acid aqueous solution.
- the brush used in the present invention is not particularly limited by its shape.
- a roll brush, a cup brush, a foil brush, an end brush, etc. can be mentioned.
- a roll brush is preferred.
- the roll brush has a form in which brush hairs are implanted in the roll shaft portion.
- the method of flocking is not particularly limited, and examples thereof include disc flocking and spiral flocking.
- the density of flocking is not particularly limited.
- the hair can be planted at a constant density around the entire circumference of the roll, or a high-density portion can be planted around the roll in a helical shape, a radial shape, a checkered shape, or the like.
- the roll brush is not particularly limited by the bristle length, but is preferably a bristle length that can uniformly rub the concave and convex portions of the linear spacer portion.
- the bristles are not particularly limited depending on the material, but those that do not scrape the catalyst surface more than necessary are preferable.
- the brush hair is preferably made of resin such as nylon, pig hair, cloth, or the like. The brush surface length of the roll brush can be appropriately set according to the width of the plate-shaped denitration catalyst element.
- wet brushing can be carried out by placing a pair of roll brushes 8 facing each other and performing both sides simultaneously.
- the roll brush 8 and the support roll 9 are placed facing each other. It can also be installed one side at a time.
- wet brushing is preferably performed simultaneously on both sides by installing a pair of roll brushes 8 facing each other.
- Wet brushing may be performed in a state where the plate-shaped denitration catalyst element is immersed in a tub containing water or an aqueous acid solution, or after the plate-shaped denitration catalyst element is immersed in water or an aqueous acid solution for a predetermined time and then pulled up. It may be carried out while spraying water or an aqueous acid solution onto the plate-like denitration catalyst element.
- the plate-shaped denitration catalyst element 1 is inserted between roll brushes using a conveying device in which guide rails are installed along the linear spacer portion 3 of the plate-shaped denitration catalyst element 1, wet brushing is continuously performed. It can be carried out. As shown in FIG. 2, it is preferable to insert the plate-shaped denitration catalyst element 1 so that the direction in which the bristle rubs is parallel to the longitudinal direction of the linear spacer portion.
- a method of placing the plate-like denitration catalyst element 1 on a mesh belt conveyor and wet brushing one side thereof, inverting the plate-like denitration catalyst element 1 with a reversing device, and then wet brushing the remaining one side of the present invention Within range.
- the plate-shaped denitration catalyst element 1 subjected to the wet brushing can be dried as necessary.
- the liquid containing the catalytically active component is preferably an aqueous solution of a compound containing at least one element selected from the group consisting of vanadium, molybdenum, and tungsten.
- a compound containing at least one element selected from the group consisting of vanadium, molybdenum, and tungsten include, for example, ammonium molybdate, ammonium metavanadate, ammonium metatungstate, the formula (NH 4 ) x Mo 2 V x O (3x + 6) (where x is 2.8 to 3.2).
- the liquid containing the catalytically active component may contain a binder such as silica sol.
- the impregnation can be performed by immersing the plate-like denitration catalyst element in a liquid containing a catalytically active component, or spraying, spraying, etc., a liquid containing a catalytically active component on the plate-like denitrated catalytic element. After impregnation, the liquid can be drained and dried as necessary. Drying can be performed by methods such as natural drying, ventilation drying, and hot air drying.
- the impregnated plate-shaped denitration catalyst element can be dried and then stacked and stored in a unit frame. The stacked storage is preferably performed so that the linear spacer portion of another plate-like denitration catalyst element adjacent to a flat portion of a certain plate-like denitration catalyst element abuts.
- a plate-shaped denitration catalyst element is subjected to wet brushing in the same manner as described above, dried if necessary, and then rubbed with a brush.
- the unit frame can be stacked and stored, and after the storage, the liquid containing the catalyst active component can be impregnated. Further, after impregnation, the liquid can be drained and dried as necessary. Storage, impregnation and drying can be performed in the same manner as described above.
- the denitration catalyst regenerated in this way can be attached to a denitration apparatus and used for denitration treatment of combustion exhaust gas.
- the evaluation method performed in this example is as follows.
- the surface of the catalyst was quantitatively analyzed by SEM-EDX, and the detected amounts of Si, Al, Ca, As and Ti on the catalyst surface were determined. Based on the amount of Ti Ti detected on the surface of the unused catalyst Ti 0, from the amount of Ti Ti detected on the surface of the used catalyst Ti 1 , the coverage ([1-Ti 1 / Ti 0 ] ⁇ 100) was calculated.
- a plate-shaped denitration catalyst element (catalyst I 0 ) having a plate made of a metal lath having a thickness of 0.7 mm formed by processing a SUS430 steel plate having a thickness of 0.2 mm and a catalyst layer supported on the plate was prepared.
- the plate-shaped denitration catalyst element (catalyst I 0 ) was stacked on the unit frame and stored to obtain a catalyst unit.
- the catalyst unit was installed in an eastern US coal-fired boiler exhaust gas denitration device and used for denitration treatment for about two years.
- a used plate-shaped denitration catalyst element (catalyst I 1 ) was taken out from the catalyst unit. It was subjected to elemental quantitative analysis of the catalyst I 1 surface. From the catalyst I 1 was cut catalyst pieces 20 mm ⁇ 100 mm. This was used to measure the denitration rate after use. The results are shown in Table 2.
- a plate-shaped denitration catalyst element (catalyst II 0 ) having a plate material made of a metal lath having a thickness of 0.7 mm formed by processing a SUS430 steel plate having a thickness of 0.2 mm and a catalyst layer supported on the plate material was prepared. .
- the plate-shaped denitration catalyst element (catalyst II 0 ) was stacked and stored on the unit frame to obtain a catalyst unit.
- the catalyst unit was installed in a denitration device for US PRB coal fired boiler exhaust gas and used for denitration treatment for about two years.
- a used plate-shaped denitration catalyst element (catalyst II 1 ) was taken out from the catalyst unit. Elemental analysis of the surface of Catalyst II 1 was performed.
- a catalyst piece of 20 mm ⁇ 100 mm was cut out from Catalyst II 1 . This was used to measure the denitration rate after use. The results are shown in Table 2.
- Reference example 1 From the catalyst I 1 was cut catalyst piece 100 mm ⁇ 100 mm.
- the catalyst piece was immersed in an aqueous oxalic acid solution at 60 ° C. and 5% by mass. While immersed in an aqueous oxalic acid solution, the surface of the catalyst piece was rubbed 20 times with a resin bristle brush (brush bristle: resin, diameter 200 ⁇ m / piece, bristle length 10 mm). The catalyst piece was naturally dried. Element coverage analysis of the surface of the obtained cleaning catalyst piece was performed to calculate the coverage. The results are shown in Table 3. Coverage was greatly reduced.
- Reference example 3 The coverage was calculated in the same manner as in Reference Example 1 except that the aqueous oxalic acid solution was changed to 60 ° C. water. The results are shown in Table 3. Coverage was greatly reduced.
- Reference example 4 The coverage was calculated in the same manner as in Reference Example 1 except that the oxalic acid aqueous solution was changed to 60 ° C. and a 5% by mass citric acid aqueous solution. The results are shown in Table 3. Coverage was greatly reduced.
- Reference Example 5 The coverage was calculated in the same manner as in Reference Example 1 except that the oxalic acid aqueous solution was changed to 15 ° C. and a 5% by mass sulfamic acid aqueous solution. The results are shown in Table 3. Coverage was greatly reduced.
- Reference Example 6 The coverage was calculated in the same manner as in Reference Example 1 except that the resin bristle brush was changed to a pork bristle brush (brush hair: pork hair, hair length 10 mm). The results are shown in Table 3. Coverage was greatly reduced.
- Reference Example 7 From the catalyst I 1 was cut catalyst piece 100 mm ⁇ 100 mm.
- the catalyst piece was immersed in an aqueous oxalic acid solution at 60 ° C. and 5% by mass.
- the catalyst piece was rocked for 1 hour while immersed in the oxalic acid aqueous solution.
- the catalyst piece was dried at 120 ° C. Element coverage analysis of the surface of the obtained cleaning catalyst piece was performed to calculate the coverage. The results are shown in Table 3. There is not much change in coverage.
- Examples 1-6 Molybdenum trioxide (MoO 3 ) and ammonium metavanadate (NH 4 VO 3 ) were added to water to obtain a slurry. The slurry was gently stirred at room temperature for 20 hours to obtain an aqueous solution containing 5% by mass of a compound represented by the formula (NH 4 ) 3 Mo 2 V 3 O 15 . The washed catalyst pieces obtained in Reference Examples 1 to 6 were immersed in the aqueous solution. The liquid was drained and dried at 120 ° C. A catalyst piece of 20 mm ⁇ 100 mm was cut out from the obtained regenerated catalyst piece. This was used to measure the denitration rate. The results are shown in Table 4. The denitration rate recovered to almost the same level as the initial denitration rate.
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Abstract
Description
例えば、特許文献1は、回転ドラムを用いてペレット状脱硝触媒の表層を摩耗削除し、次いで水洗することを含む脱硝触媒の再生方法を開示している。
特許文献2は板状またはハニカム状触媒のガス流路に触媒より硬い粒状体を均一に散布して、触媒表面を薄く削り取ることを含む触媒の再生方法を開示している。
特許文献3は、多数の筒状、ハニカム状または多数の板状に形成された劣化触媒をブラシ、サンドペーパー、やすり、珪砂などで研削することを含む触媒の乾式再生方法を開示している。
特許文献4は、ハニカム触媒の表面から物理的にダスト成分を除去し、次いで触媒活性成分を含浸させることを含む脱硝触媒の再生方法を開示している。ダスト成分の除去は、ハニカム触媒の各孔(セル)内を直接ブラシで清掃したり、エアブローやサンドブラストで除去したり、或いは水洗や超音波洗浄など、適宜これらを併用して行うと、特許文献4は述べている。
特許文献6は、アルカリ水溶液で触媒蓄積物質を洗浄除去した後、酸水溶液で処理することを含む脱硝触媒の再生方法を開示している。
特許文献7は、シリカ、アルミナまたは硫酸カルシウムの付着によって活性が低下した脱硝触媒を水洗いし、含水させた後に、有機酸とフッ化物との混合液を用いてシリカ、アルミナまたは硫酸カルシウムを常温で洗浄除去することを含む脱硝触媒の活性改良方法を開示している。
ブラシで擦られた板状脱硝触媒エレメントに触媒活性成分を含有する液を含浸させることを含む、使用済み脱硝触媒の再生方法。
該排煙脱硝処理によってSi、AlまたはCaを含有する化合物が付着した板状脱硝触媒エレメントを触媒ユニットから取り出し、
触媒ユニットから取り出した板状脱硝触媒エレメントの表面に水または酸水溶液を付着させた状態で該板状脱硝触媒エレメントの表面をブラシで擦り、
ブラシで擦られた板状脱硝触媒エレメントに触媒活性成分を含有する液を含浸させることを含む、使用済み脱硝触媒の再生方法。
〔4〕 触媒活性成分を含有する液を含浸させる前に、ブラシで擦られた板状脱硝触媒エレメントをユニット枠に積み重ねて収納することをさらに含む、〔2〕に記載の再生方法。
〔7〕 水または酸水溶液が、スルファミン酸水溶液、シュウ酸水溶液またはクエン酸水溶液である、〔1〕~〔6〕のいずれかひとつに記載の再生方法。
水または酸水溶液を付着させるために、例えば、板状脱硝触媒エレメントを水または酸水溶液に浸けたり;板状脱硝触媒エレメントに水または酸水溶液を噴霧、散布などしたり;することができる。湿式ブラッシングにおいては除去効率の観点から好ましくは酸水溶液、より好ましくはスルファミン酸水溶液または有機酸水溶液、さらに好ましくはスルファミン酸水溶液、シュウ酸水溶液またはクエン酸水溶液が用いられる。酸濃度は、好ましくは0.1~10質量%である。
また、水を使用する場合、その温度は、特に限定されないが、通常、10~80℃である。酸水溶液を使用する場合、その温度は、酸の種類に応じて最適範囲が若干異なるが、通常、10~80℃である。酸水溶液の最適温度は、例えば、シュウ酸水溶液またはクエン酸水溶液の場合は、好ましくは40~80℃であり、スルファミン酸水溶液の場合は、好ましくは60℃以下である。
湿式ブラッシングが施された板状脱硝触媒エレメント1は必要に応じて乾燥させることができる。
触媒活性成分を含有する液は、バナジウム、モリブデン、およびタングステンからなる群より選ばれる少なくとも一つの元素を含む化合物の水溶液であることが好ましい。係る化合物としては、例えば、モリブデン酸アンモニウム、メタバナジン酸アンモニウム、メタタングステン酸アンモニウム、示性式(NH4)xMo2VxO(3x+6)(但しxは2.8~3.2)で表わされる化合物などを挙げることができる。触媒活性成分を含有する液にはシリカゾルなどのバインダが含まれていてもよい。
本発明の一実施形態では、図6に示すように、含浸させた板状脱硝触媒エレメントを乾燥させ次いでユニット枠に積み重ねて収納することができる。積み重ねての収納は、或る一枚の板状脱硝触媒エレメントの平坦部に隣り合う他の板状脱硝触媒エレメントの線条スペーサ部が当接するように行うことが好ましい。
触媒の表面をSEM-EDXにより定量分析して、触媒表面のSi、Al、Ca、AsおよびTiの検出量を決定した。
未使用触媒の表面で検出されたTiの量Ti0を基準にして、使用済触媒の表面で検出されたTiの量Ti1から、被覆率([1-Ti1/Ti0]×100)を算出した。
20mm×100mmの触媒小片1枚の充填された350℃の管型反応器に表1に示す組成比のガスを3L/minにて供給して、脱硝率を測定した。
厚さ0.2mmのSUS430製鋼板を加工して成る厚さ0.7mmのメタルラスからなる板材と、該板材に担持された触媒層とを有する板状脱硝触媒エレメント(触媒I0)を用意した。触媒層は、酸化チタン(TiO2)、酸化タングステン(WO3)及び酸化バナジウム(V2O5)を原子比Ti/W/V=94.5/5/0.5で含有する触媒成分と、触媒成分に対して15質量%のシリカ・アルミナ系無機繊維と、触媒成分に対して8質量%のバインダ(SiO2)とを含有するものである。触媒I0表面の元素定量分析を行った。触媒I0から20mm×100mmの触媒小片を切り出した。これを用いて初期脱硝率を測定した。結果を表2に示す。
厚さ0.2mmのSUS430製鋼板を加工して成る厚さ0.7mmのメタルラスからなる板材と、該板材に担持された触媒層とを有する板状脱硝触媒エレメント(触媒II0)を用意した。触媒層は、酸化チタン(TiO2)、酸化モリブデン(MoO3)及び酸化バナジウム(V2O5)を原子比Ti/Mo/V=94/5/1で含有する触媒成分と、触媒成分に対して15質量%のシリカ・アルミナ系無機繊維と、触媒成分に対して2質量%のバインダ(SiO2)とを含有するものである。触媒II0表面の元素定量分析を行った。触媒II0から20mm×100mmの触媒小片を切り出した。これを用いて初期脱硝率を測定した。結果を表2に示す。
触媒I1から100mm×100mmの触媒片を切り出した。触媒片を60℃、5質量%のシュウ酸水溶液に漬けた。シュウ酸水溶液に漬けた状態で触媒片の表面を樹脂毛ブラシ(ブラシ毛:樹脂製、直径200μm/本、毛丈10mm)で20回擦った。該触媒片を自然乾燥させた。得られた洗浄触媒片の表面の元素定量分析を行って被覆率を算出した。結果を表3に示す。被覆率が大幅に減った。
触媒I1を触媒II1に変えた以外は参考例1と同じ方法で被覆率を算出した。結果を表3に示す。被覆率が大幅に減った。
シュウ酸水溶液を60℃の水に変えた以外は参考例1と同じ方法で被覆率を算出した。結果を表3に示す。被覆率が大幅に減った。
シュウ酸水溶液を60℃、5質量%のクエン酸水溶液に変えた以外は参考例1と同じ方法で被覆率を算出した。結果を表3に示す。被覆率が大幅に減った。
シュウ酸水溶液を15℃、5質量%のスルファミン酸水溶液に変えた以外は参考例1と同じ方法で被覆率を算出した。結果を表3に示す。被覆率が大幅に減った。
樹脂毛ブラシを豚毛ブラシ(ブラシ毛:豚毛、毛丈10mm)に変えた以外は参考例1と同じ方法で被覆率を算出した。結果を表3に示す。被覆率が大幅に減った。
触媒I1から100mm×100mmの触媒片を切り出した。触媒片を60℃、5質量%のシュウ酸水溶液に漬けた。シュウ酸水溶液に漬けた状態で触媒片を1時間揺り動かした。該触媒片を120℃で乾燥させた。得られた洗浄触媒片の表面の元素定量分析を行って被覆率を算出した。結果を表3に示す。被覆率にあまり変化がない。
触媒I1を触媒II1に変えた以外は参考例6と同じ方法で被覆率を算出した。結果を表3に示す。被覆率にあまり変化がない。
触媒I1から100mm×100mmの触媒片を切り出した。触媒片の表面をブラシ(ブラシ毛:樹脂製、直径200μm/本、毛丈10mm)で20回擦った。
水に三酸化モリブデン(MoO3)とメタバナジン酸アンモニウム(NH4 VO3 )を添加してスラリーを得た。該スラリーを常温で20時間緩やかに撹拌して、示性式(NH4)3Mo2V3O15で表される化合物を5質量%含有する水溶液を得た。
参考例1~6で得られた洗浄触媒片を前記水溶液に漬けた。液切りし、120℃で乾燥させた。得られた再生触媒片から20mm×100mmの触媒小片を切り出した。これを用いて脱硝率を測定した。結果を表4に示す。脱硝率が初期脱硝率とほぼ同じレベルにまで回復した。
洗浄触媒片を参考例7~9で得られた洗浄触媒片に変えた以外は実施例1と同じ方法で脱硝率を測定した。結果を表4に示す。脱硝率は回復したが、その回復率は実施例のものに比べて低い。
Claims (7)
- 平坦部と線条スペーサ部とを交互に有する板材および該板材に担持された酸化チタンを主成分として含有する触媒層からなり且つ排煙脱硝処理によってSi、AlまたはCaを含有する化合物が付着した板状脱硝触媒エレメントの表面に水または酸水溶液を付着させた状態で該板状脱硝触媒エレメントの表面をブラシで擦り、
ブラシで擦られた板状脱硝触媒エレメントに触媒活性成分を含有する液を含浸させることを含む、使用済み脱硝触媒の再生方法。 - 平坦部と線条スペーサ部とを交互に有する板材および該板材に担持された酸化チタンを主成分として含有する触媒層からなる板状脱硝触媒エレメント、ならびに或る一枚の板状脱硝触媒エレメントの平坦部に隣り合う他の板状脱硝触媒エレメントの線条スペーサ部が当接するように複数の板状脱硝触媒エレメントを積み重ねて収納することができるユニット枠からなる触媒ユニットにて排煙脱硝処理を行い、
該排煙脱硝処理によってSi、AlまたはCaを含有する化合物が付着した板状脱硝触媒エレメントを触媒ユニットから取り出し、
触媒ユニットから取り出した板状脱硝触媒エレメントの表面に水または酸水溶液を付着させた状態で該板状脱硝触媒エレメントの表面をブラシで擦り、
ブラシで擦られた板状脱硝触媒エレメントに触媒活性成分を含有する液を含浸させることを含む、使用済み脱硝触媒の再生方法。 - 触媒活性成分を含有する液の含浸がなされた板状脱硝触媒エレメントをユニット枠に積み重ねて収納することをさらに含む、請求項2に記載の再生方法。
- 触媒活性成分を含有する液を含浸させる前に、ブラシで擦られた板状脱硝触媒エレメントをユニット枠に積み重ねて収納することをさらに含む、請求項2に記載の再生方法。
- 触媒活性成分が、バナジウム、モリブデン、およびタングステンからなる群より選ばれる少なくとも一つの元素を含むものである、請求項1~4のいずれかひとつに記載の再生方法。
- ブラシが、ロールブラシである、請求項1~5のいずれかひとつに記載の再生方法。
- 水または酸水溶液が、スルファミン酸水溶液、シュウ酸水溶液またはクエン酸水溶液である、請求項1~6のいずれかひとつに記載の再生方法。
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| JP6929480B1 (ja) * | 2020-12-28 | 2021-09-01 | 三菱パワー株式会社 | 板状触媒エレメントの金属基材と触媒固形物との分離方法及び装置 |
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