WO2021171626A1 - Procédé d'abrasion de catalyseur de dénitrification et dispositif d'abrasion de catalyseur de dénitrification - Google Patents

Procédé d'abrasion de catalyseur de dénitrification et dispositif d'abrasion de catalyseur de dénitrification Download PDF

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WO2021171626A1
WO2021171626A1 PCT/JP2020/008546 JP2020008546W WO2021171626A1 WO 2021171626 A1 WO2021171626 A1 WO 2021171626A1 JP 2020008546 W JP2020008546 W JP 2020008546W WO 2021171626 A1 WO2021171626 A1 WO 2021171626A1
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Prior art keywords
denitration catalyst
polishing
air
humidifying
abrasive
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PCT/JP2020/008546
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English (en)
Japanese (ja)
Inventor
敏和 吉河
吉田　和広
啓一郎 盛田
亨浩 吉岡
展充 伊田
大輔 坂本
広大 日高
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中国電力株式会社
ハシダ技研工業株式会社
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Priority to JP2020535142A priority Critical patent/JPWO2021171626A1/ja
Priority to PCT/JP2020/008546 priority patent/WO2021171626A1/fr
Publication of WO2021171626A1 publication Critical patent/WO2021171626A1/fr

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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
    • 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
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • 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
    • 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
    • B01J38/04—Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst
    • B01J38/06—Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst using steam

Definitions

  • the present invention relates to a denitration catalyst polishing method and a denitration catalyst polishing apparatus for polishing a denitration catalyst.
  • polishing regeneration is one of the techniques for regenerating a denitration catalyst having deteriorated performance. Polishing regeneration is a technique for recovering catalyst performance by polishing the surface of a denitration catalyst whose performance has deteriorated.
  • Patent Document 1 discloses a technique relating to a method for regenerating a denitration catalyst in which a mixture of an abrasive (abrasive) and a gas is passed through a through hole of the denitration catalyst to grind the inner wall of the through hole.
  • An upstream fixing member having an expanded portion having a cross-sectional area larger than the cross-sectional area of the member to be ground is connected to one end of the member to be ground made of a denitration catalyst.
  • a screen member is arranged in the expanded portion. In such an expanded portion, the mixture of the abrasive and the gas is dispersed as the flow velocity is reduced, and the inner wall of the through hole can be uniformly ground.
  • Patent Document 1 can uniformly polish all through holes of the denitration catalyst, but there is room for improvement from the viewpoint of polishing efficiency of the denitration catalyst.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a denitration catalyst polishing method and a denitration catalyst polishing apparatus capable of improving the polishing efficiency of the denitration catalyst.
  • the present invention is a denitration catalyst polishing method in which a polishing material is circulated together with air through the through holes of a denitration catalyst provided with a plurality of through holes extending in the longitudinal direction to polish the inner surface of the through holes.
  • the present invention relates to a denitration catalyst polishing method including a humidification step of humidifying the denitration catalyst and a polishing step of polishing the denitration catalyst after the humidification step or at the same time as the humidification step.
  • the humidification step is performed at the same time as the polishing step, and it is preferable to humidify the denitration catalyst by humidifying the air flowing through the through hole together with the abrasive in the polishing step.
  • the pre-polishing weight measuring step for measuring the weight of the denitration catalyst is provided before the humidification step, and the pre-polishing weight measurement step may include a pre-polishing drying step for drying the denitration catalyst.
  • the present invention is a denitration catalyst polishing apparatus for polishing the inner surface of the through holes by allowing an abrasive material to flow together with air through the through holes of the denitration catalyst provided with a plurality of through holes extending in the longitudinal direction.
  • An inflow path provided upstream of the denitration catalyst and mixing the abrasive and air, and between the mixing portion and the denitration catalyst, through which the abrasive mixed with air flows.
  • the present invention relates to a denitration catalyst polishing device, which is arranged on the downstream side of the denitration catalyst and includes a suction unit for sucking an abrasive mixed with air and an object to be polished, and a humidifying device for humidifying the denitration catalyst.
  • the humidifying device humidifies the denitration catalyst by humidifying the air mixed with the abrasive in the mixing portion.
  • the present invention can provide a denitration catalyst polishing method and a denitration catalyst polishing apparatus capable of improving the polishing efficiency of the denitration catalyst.
  • the denitration catalyst polishing method and the denitration catalyst to be polished by the denitration catalyst polishing apparatus according to the embodiment of the present invention are, for example, the denitration catalyst C which has been used for a certain period of time in the coal-fired power generation facility 100 described below and has deteriorated performance. be.
  • the coal-fired power generation facility 100 is located on the downstream side of the coal bunker 110, the coal feeder 115, the pulverized coal machine 120, the pulverized coal supply pipe 130, the combustion boiler 140, and the combustion boiler 140.
  • An exhaust passage 150 provided, a denitration device 160 provided in the exhaust passage 150, an air preheater 170, a gas heater 180 for heat recovery, an electrostatic dust collector 190, an induction blower 210, a wet desulfurization device 220, and a gas heater 230 for reheating.
  • a desulfurization ventilator 240, and a chimney 250 are examples of the air preheater 170, a gas heater 180 for heat recovery.
  • the coal bunker 110 stores coal supplied by a coal transport facility from a coal silo (not shown).
  • the coal feeder 115 supplies the coal supplied from the coal bunker 110 to the pulverized coal machine 120 at a predetermined supply speed.
  • the pulverized coal machine 120 produces pulverized coal by pulverizing the coal supplied from the coal feeder 115 to an average particle size of 60 ⁇ m to 80 ⁇ m.
  • a roller mill, a tube mill, a bora mill, a beater mill, an impeller mill and the like are used as the pulverized coal machine 120.
  • the combustion boiler 140 burns the pulverized coal supplied from the pulverized coal supply pipe pulverized coal machine 130 together with the forcibly supplied air by the pulverized coal burner b. Combustion of pulverized coal produces coal ash such as clinker ash and fly ash, and also generates exhaust gas.
  • Clinker ash refers to lumpy coal ash that falls to the bottom of the combustion boiler 140 among the coal ash.
  • Fly ash refers to coal ash having a small particle size (particle size of about 200 ⁇ m or less) that circulates together with exhaust gas on the exhaust passage 150 side.
  • the exhaust passage 150 is arranged on the downstream side of the combustion boiler 140, and circulates the exhaust gas and coal ash generated in the combustion boiler 140.
  • the denitration device 160 removes nitrogen oxides in the exhaust gas.
  • the denitration device 160 removes nitrogen oxides in the exhaust gas by, for example, a dry ammonia catalytic reduction method.
  • the dry ammonia catalytic reduction method is a method in which ammonia gas is injected as a reducing agent into exhaust gas at a relatively high temperature (300 ° C to 400 ° C), and nitrogen oxides in the exhaust gas are decomposed into nitrogen and water vapor by the action with a denitration catalyst. Is.
  • the denitration device 160 includes a denitration reactor 161 in which a denitration reaction is performed, and a plurality of stages of denitration catalyst layers 162 arranged inside the denitration reactor 161.
  • the denitration catalyst layer 162 is composed of a plurality of casings 163.
  • a plurality of denitration catalysts C are housed in the casing 163.
  • the denitration catalyst C is a long (rectangular parallelepiped) catalyst having a honeycomb structure in which a plurality of through holes C1 extending in the longitudinal direction are formed.
  • the plurality of denitration catalysts C are arranged so that the extending direction of the through hole C1 is along the flow path of the exhaust gas.
  • the air preheater 170 is arranged on the downstream side of the denitration device 160 in the exhaust passage 150.
  • the air preheater 170 exchanges heat between the exhaust gas that has passed through the denitration device 160 and the combustion air, cools the exhaust gas, and heats the combustion air.
  • the heated combustion air is supplied to the boiler 140 by the push-in ventilator 175.
  • the heat recovery gas heater 180 is arranged on the downstream side of the air preheater 170 in the exhaust passage 150.
  • the heat recovery gas heater 180 is supplied with the exhaust gas heat recovered by the air preheater 170.
  • the heat recovery gas heater 180 further recovers heat from the exhaust gas.
  • the electrostatic precipitator 190 is arranged on the downstream side of the heat recovery gas heater 180 in the exhaust passage 150.
  • the exhaust gas recovered by the heat recovery gas heater 180 is supplied to the electrostatic precipitator 190.
  • the electrostatic precipitator 190 is a device that collects (captures) coal ash (fly ash) in the exhaust gas by applying a voltage to the electrodes.
  • the fly ash collected (captured) by the electrostatic precipitator 190 is collected by the fly ash recovery device 191.
  • the attract ventilator 210 is arranged on the downstream side of the electrostatic precipitator 190 in the exhaust passage 150.
  • the attraction ventilator 210 takes in the exhaust gas from which the fly ash has been removed in the electrostatic precipitator 190 from the primary side and sends it out to the secondary side.
  • the desulfurization device 220 is arranged on the downstream side of the induction ventilator 210 in the exhaust passage 150.
  • the exhaust gas sent from the induction ventilator 210 is supplied to the desulfurization apparatus 220.
  • the desulfurization apparatus 220 removes sulfur oxides in the exhaust gas by, for example, a wet lime-gypsum method.
  • a wet lime-gypsum method by spraying a mixed solution of limestone and water on the exhaust gas, the sulfur oxides contained in the exhaust gas are absorbed by the mixed solution to generate a desulfurized gypsum slurry, and the sulfur oxides in the exhaust gas are generated. Is a method of removing.
  • the wastewater containing trace substances such as boron and selenium generated at this time is treated by the wastewater treatment device 221.
  • the reheating gas heater 230 is arranged on the downstream side of the desulfurization apparatus 220 in the exhaust passage 150. Exhaust gas from which sulfur oxides have been removed in the desulfurization apparatus 220 is supplied to the reheating gas heater 230. The reheating gas heater 230 heats the exhaust gas.
  • the heat recovery gas heater 180 and the reheating gas heater 230 flow between the exhaust gas flowing between the air preheater 170 and the electrostatic precipitator 190 and the desulfurization device 220 and the desulfurization ventilator 240 in the exhaust passage 150. It may be configured as a gas-gas heater that exchanges heat with the exhaust gas to be generated.
  • the desulfurization ventilator 240 is arranged on the downstream side of the reheating gas heater 230 in the exhaust passage 150.
  • the desulfurization ventilator 240 takes in the exhaust gas heated by the reheating gas heater 230 from the primary side and sends it out to the secondary side.
  • the chimney 250 is arranged on the downstream side of the desulfurization ventilator 240 in the exhaust passage 150. Exhaust gas heated by the reheating gas heater 230 is introduced into the chimney 250. The chimney 250 emits exhaust gas.
  • the denitration catalyst C used in the coal-fired power generation facility 100 described above has thermal deterioration such as sintering due to continued use, chemical deterioration due to poisoning of catalyst components, and physical deterioration in which soot and dust cover the catalyst surface. Due to such factors, the denitration performance deteriorates.
  • the denitration catalyst C whose denitration performance has deteriorated, recovers its denitration performance by polishing the inner surface of the through hole C1 which is the surface of the catalyst and removing deposits and the like on the surface.
  • the denitration catalyst polishing apparatus 1 for polishing the inner surface of the through hole C1 of the denitration catalyst C whose denitration performance has deteriorated to recover the denitration performance will be described.
  • the denitration catalyst polishing device 1 is an device that circulates the polishing material A together with air through the through hole C1 of the denitration catalyst C to polish the inner surface of the through hole C1.
  • the denitration catalyst polishing device 1 includes a mixing unit 10, an inflow path 20, an outflow path 30, a cyclone 40, a compressor 50, a bag filter 60, a suction fan 70, and a humidifying device 80.
  • the denitration catalyst C which is the object to be polished by the denitration catalyst polishing device 1, is sandwiched between the upstream fixing member 22 in the inflow path 20 and the downstream fixing member 32 in the outflow path 30.
  • the denitration catalyst C is fixed so that the flow path direction of the through hole C1 of the denitration catalyst C is substantially perpendicular to the horizontal plane.
  • the mixing unit 10 mixes air and the abrasive A, and supplies the abrasive A mixed with air to the denitration catalyst C via the inflow path 20.
  • the mixing section 10 is provided with a blast gun 11, a funnel section 12, and a cabinet 13 for accommodating them.
  • the blast gun 11 is connected to the compressor 50 via an air hose 51, and can inject compressed air.
  • a plurality of blast guns 11 may be provided.
  • An abrasive material supply path 33 which will be described later, is connected to the blast gun 11. When compressed air is injected from the blast gun 11, an ejector effect is generated, and the abrasive A is supplied into the blast gun 11 through the abrasive supply path 33.
  • the cabinet 13 is provided with an opening 13a. Since air is sucked into the inside of the cabinet 13 by the suction fan 70, the pressure is negative, and the outside air is sucked from the opening 13a.
  • the abrasive A injected from the blast gun 11 flows into the inflow path 20 through the funnel portion 12 in a state of being uniformly mixed with the outside air sucked from the opening 13a.
  • the humidifying device 80 is provided in the vicinity of the opening 13a, and the outside air sucked from the opening 13a is humidified by the humidifying device 80.
  • the humidifying device 80 is a device that generates air containing water vapor and water fine particles.
  • the humidifying device is not particularly limited, and conventionally known ones are used. For example, humidification using a steam method that heats water with a heater to generate water vapor, a vaporization method that evaporates water at room temperature, and an ultrasonic method that vibrates water with ultrasonic waves and ejects it as fine particles. Equipment is mentioned.
  • the denitration catalyst C can be indirectly humidified by humidifying the air mixed with the abrasive A by the humidifying device 80.
  • the polishing efficiency can be improved by about 10%, although it depends on the conditions. The reason why the polishing efficiency is improved in this way is not clear, but it is considered that, for example, the denitration catalyst C is softened by humidification.
  • the inflow path 20 is a flow path on the upstream side of the denitration catalyst C, and is a flow path through which the abrasive A mixed with air flows in.
  • the inflow path 20 includes an upstream side flow path 21 and an upstream side fixing member 22.
  • the upstream side flow path 21 is a flow path having a bent portion, the upstream side is connected to the funnel portion 12, and the downstream side is connected to the upstream side fixing member 22.
  • the upstream side fixing member 22 has a linear flow path, and the downstream side is connected to the lower end portion (upstream side end portion) of the denitration catalyst C to fix the denitration catalyst C.
  • the outflow passage 30 is a flow path on the downstream side of the denitration catalyst C.
  • the outflow passage 30 is a flow path through which the abrasive material A and the object to be polished generated by polishing the surface of the denitration catalyst C flow.
  • the abrasive material A and the object to be polished are sucked together with air by a suction fan 70 as a suction part.
  • a cyclone 40 is provided in the middle of the outflow passage 30, and the abrasive material A and the object to be polished are separated.
  • the outflow passage 30 is a downstream fixing member 32 that is connected to the upper end portion (downstream side end portion) of the denitration catalyst C to fix the denitration catalyst C, and a downstream flow path that connects the downstream fixing member 32 and the cyclone 40. It has a 31 and an abrasive supply path 33 that connects the cyclone 40 and the mixing portion 10.
  • the cyclone 40 is a known cyclone classifier, and is arranged at a position higher than that of the mixing unit 10.
  • the upstream end of the cyclone 40 is connected to the downstream flow path 31.
  • An abrasive material supply path 33 is connected to the lower part of the cyclone 40, and the abrasive material A separated by the cyclone 40 falls by gravity through the abrasive material supply path 33 and is supplied to the mixing unit 10.
  • the downstream end of the cyclone 40 is connected to the transport pipe 41, and the downstream end of the transport pipe 41 is connected to the bag filter 60. The object to be polished separated by the cyclone 40 flows into the bag filter 60 together with air through the transport pipe 41.
  • the bug filter 60 is a known dust collector.
  • the bag filter 60 collects dust in the air including the object to be polished of the denitration catalyst C.
  • the collected dust is stored in a storage unit (not shown) provided at the bottom of the bag filter 60, and is collected at a desired timing.
  • the downstream end of the bag filter 60 is connected to the connecting pipe 61.
  • the downstream end of the connecting pipe 61 is connected to a suction fan 70 as a suction portion.
  • the clean air that has passed through the bag filter 60 and whose dust has been removed is sucked by the suction fan 70 and discharged into the atmosphere by the exhaust duct 71.
  • the denitration catalyst C whose denitration performance has deteriorated which is the object to be polished by the denitration catalyst polishing device 1, is removed from the denitration device 160 of the coal-fired power generation facility 100.
  • the through hole C1 of the denitration catalyst C may be blocked by coal ash or the like, the blocked object is appropriately removed by air blowing, washing with water, or the like.
  • the denitration catalyst C is sandwiched between the upstream fixing member 22 and the downstream fixing member 32 to fix the denitration catalyst C.
  • the denitration catalyst C may be arranged and fixed so that the side with a large amount of deposits, which was the end on the inlet side of the exhaust gas in the denitration device 160, is on the downstream side where the flow velocity of the abrasive A is high. ..
  • the suction fan 70 and the compressor 50 are started to operate, and the polishing material A mixed with air is sucked to the upstream side in the mixing unit 10.
  • the abrasive A flows into the through hole C1 of the denitration catalyst C via the upstream side flow path 21 and the upstream side fixing member 22, and flows out from the downstream side fixing member 32.
  • the outflowing abrasive material A and the object to be polished are sucked together with air by the suction fan 70 and flow into the cyclone 40 through the downstream flow path 31.
  • the abrasive material A and the object to be polished are separated, and the abrasive material A is supplied to the mixing unit 10 via the abrasive material supply path 33. That is, the abrasive A circulates in the denitration catalyst polishing apparatus 1.
  • the object to be polished separated by the cyclone 40 is sucked by the suction fan 70, flows into the bag filter 60 through the transport pipe 41, and is collected. The air after the object to be polished is collected is discharged to the outside through the exhaust duct 71.
  • the denitration catalyst C is regenerated by continuing the operation of the denitration catalyst polishing device 1 for a predetermined time, polishing the inner surface of the through hole C1 of the denitration catalyst C, and removing the deposits adhering to the inner surface of the through hole C1.
  • Denitration catalyst polishing method Whether or not the inner surface of the through hole C1 is sufficiently polished by polishing the denitration catalyst C and the denitration performance is restored is determined by, for example, measuring the weight of the denitration catalyst C before and after polishing. Further, in order to determine the optimum polishing time of the denitration catalyst C, the weight of the denitration catalyst C is measured.
  • the denitration catalyst polishing method according to the present embodiment which includes the weight measurement steps before and after polishing, will be described with reference to the flowchart of FIG.
  • the weight of the denitration catalyst C before polishing is measured (S1).
  • the weight of the denitration catalyst C before polishing and before drying is measured (S11).
  • the denitration catalyst C is dried before polishing (S12).
  • the weight W1 after pre-polishing and drying immediately after passing through the pre-polishing drying step S12 of the denitration catalyst C is measured (S13).
  • the denitration catalyst C contains a porous material and has high hygroscopicity.
  • the weight change of the denitration catalyst C before and after polishing includes not only the change in the polishing amount but also the change in the water content. Then, when the weight before and after polishing is measured without drying, the accurate amount of polishing cannot be measured. Therefore, in the present embodiment, the denitration catalyst C is dried before and after polishing. Further, even if the humidification step S2 is not provided, it is necessary to provide a drying step because moisture may evaporate from the denitration catalyst C during the polishing step S3.
  • the pre-polishing and post-drying weight measurement step S13 determines the pre-polishing and post-drying weight W1.
  • a step of comparing the pre-polishing pre-drying weight and the pre-polishing post-drying weight may be provided.
  • the weight difference between the weight before drying before polishing and the weight after drying before polishing is a certain amount or more (for example, the weight difference is 1.0% or more of the weight before drying before polishing)
  • the denitration catalyst before drying contains a large amount of water. It may have been. In this case, since it is possible that the drying was not sufficient, the pre-polishing drying step S12 may be performed again, and then the pre-polishing post-drying weight measuring step S13 may be performed to determine the pre-polishing post-drying weight W1.
  • the denitration catalyst C is humidified (S2). Polishing efficiency can be improved by humidifying the denitration catalyst C.
  • the humidification method is not particularly limited, and the denitration catalyst C may be immersed in water, the denitration catalyst C may be allowed to stand in a humidifier for a certain period of time, or water may be sprayed to humidify. You may.
  • the denitration catalyst polishing device 1 according to the present embodiment is used to humidify the air to be mixed with the polishing material A by the humidifying device 80. That is, it is preferable to simultaneously perform the humidification step S2 in the polishing step S3. As a result, the humidification step S2 can be performed without generating wastewater or the like and without any trouble.
  • the denitration catalyst C is polished (S3).
  • the polishing material A mixed with air is circulated through the through hole C1 of the denitration catalyst C to polish the inner surface of the through hole C1.
  • the polishing time is the time during which all the deposits are considered to be removed in order to prevent excessive polishing, that is, polishing to the inner surface of the through hole C1 beyond the deposits adhering to the inner surface of the through hole C1. It is preferable to set it shorter.
  • the process proceeds to the weight measurement step after polishing (S5). If an abnormality such as damage occurs in the appearance of the denitration catalyst C, a new denitration catalyst C is polished without performing the following steps.
  • the weight of the denitration catalyst C after polishing and before drying is measured (S51).
  • the denitration catalyst C is polished and then dried (S52).
  • the weight W2 after polishing and drying immediately after the denitration catalyst C has undergone the post-polishing and drying step S52 is measured (S53).
  • the reason why the denitration catalyst C is dried even after polishing is that the denitration catalyst C absorbs water in the humidification step S2.
  • a step of comparing the post-polishing post-drying weight and the post-polishing post-drying weight may be provided. good.
  • the post-polishing and drying step S52 is performed again, and the post-polishing and post-drying weight measuring step S53 is performed for polishing.
  • the weight W2 may be determined after post-drying.
  • the difference between the pre-polishing post-drying weight W1 and the post-polishing post-drying weight W2 is determined. Then, it is determined whether or not the difference exceeds the target value (for example, the weight difference is 11.4% or more of the weight before polishing) (S6). If the weight difference does not exceed the target value, it is considered that the polishing is insufficient and the process returns to S2 again. Further, the optimum polishing time of the denitration catalyst C can be determined based on the above weight difference with respect to the polishing time.
  • the target value for example, the weight difference is 11.4% or more of the weight before polishing
  • polishing conditions are the same, for example, the type of abrasive A, the particle size, the circulation path, the supply amount, the differential pressure before and after the denitration catalyst C, the flow rate of the abrasive A flowing through the denitration catalyst C, etc., the above determination is made.
  • the polishing time of the denitration catalyst C can be applied.
  • the denitration catalyst polishing method according to the present embodiment includes a humidification step S2 and a polishing step S3 after the humidification step S2 or at the same time as the humidification step S2. Thereby, the polishing efficiency of the denitration catalyst C can be improved.
  • the humidification step S2 was performed at the same time as the polishing step S3, and the denitration catalyst C was polished by humidifying the air mixed with the polishing material A. As a result, wastewater is not generated in the humidification step S2, and the denitration catalyst C can be humidified without any trouble.
  • a pre-polishing weight measurement step S1 was provided before the humidification step S2, and the pre-polishing weight measurement step S1 included a pre-polishing drying step S12.
  • the denitration catalyst C is dried and weighed for the purpose of confirming the amount of polishing, the denitration catalyst C is humidified in the humidification step S2, so that the polishing efficiency of the denitration catalyst C can be improved.
  • the denitration catalyst polishing device 1 is arranged on the upstream side of the denitration catalyst C, and connects the mixing unit 10 that mixes the abrasive A and the air, the mixing unit 10, and the denitration catalyst C with air.
  • a humidifying device 80 for humidifying the denitration catalyst C was provided. As a result, the denitration catalyst C can be humidified while polishing the denitration catalyst C, and the polishing efficiency of the denitration catalyst C can be improved.
  • the humidifying device 80 humidifies the denitration catalyst C by humidifying the air mixed with the abrasive A in the mixing unit 10. As a result, the denitration catalyst C can be easily humidified, and the polishing efficiency of the denitration catalyst C can be improved.
  • Denitration catalyst polishing device 10 1 Denitration catalyst polishing device 10 Mixing part 20 Inflow path 70 Suction fan (suction part) 80 Humidifier C Denitration catalyst C1 Through hole

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Abstract

La présente invention concerne un procédé d'abrasion de catalyseur de dénitrification et un dispositif d'abrasion de catalyseur de dénitrification permettant d'améliorer l'efficacité d'abrasion d'un catalyseur de dénitrification.　Le procédé d'abrasion de catalyseur de dénitrification comprend l'étape consistant à amener un matériau abrasif (A), ainsi que de l'air, à s'écouler dans une pluralité de trous traversants (C1) d'un catalyseur de dénitrification (C) pour abraser la surface interne de chacun des trous traversants (C1), les trous traversants (C1) s'étendant dans la direction de la longueur, le procédé étant doté d'une étape d'abrasion (S3) destinée à abraser le catalyseur de dénitrification (C) simultanément avec ou avant une étape d'humidification (S2) destinée à humidifier le catalyseur de dénitrification (C). L'humidification du catalyseur de dénitrification (C) par l'intermédiaire de l'étape d'humidification (S2) permet d'améliorer l'efficacité d'abrasion.
PCT/JP2020/008546 2020-02-28 2020-02-28 Procédé d'abrasion de catalyseur de dénitrification et dispositif d'abrasion de catalyseur de dénitrification WO2021171626A1 (fr)

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PCT/JP2020/008546 WO2021171626A1 (fr) 2020-02-28 2020-02-28 Procédé d'abrasion de catalyseur de dénitrification et dispositif d'abrasion de catalyseur de dénitrification

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59191096U (ja) * 1984-04-11 1984-12-18 広中　重信 研掃装置のノズル
JPS61125329U (fr) * 1985-01-22 1986-08-06
JP2004202485A (ja) * 2002-11-07 2004-07-22 Jfe Plant & Service Corp プラント機器の高効率清掃方法
JP2012000693A (ja) * 2010-06-14 2012-01-05 Hidaka Fine-Technologies Co Ltd 研削加工装置及び研削加工方法
JP2016209835A (ja) * 2015-05-11 2016-12-15 三菱日立パワーシステムズ株式会社 脱硝触媒の性能を回復させる方法
US20180141034A1 (en) * 2015-05-12 2018-05-24 Geesco Co., Ltd. Method for regenerating catalyst

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59191096U (ja) * 1984-04-11 1984-12-18 広中　重信 研掃装置のノズル
JPS61125329U (fr) * 1985-01-22 1986-08-06
JP2004202485A (ja) * 2002-11-07 2004-07-22 Jfe Plant & Service Corp プラント機器の高効率清掃方法
JP2012000693A (ja) * 2010-06-14 2012-01-05 Hidaka Fine-Technologies Co Ltd 研削加工装置及び研削加工方法
JP2016209835A (ja) * 2015-05-11 2016-12-15 三菱日立パワーシステムズ株式会社 脱硝触媒の性能を回復させる方法
US20180141034A1 (en) * 2015-05-12 2018-05-24 Geesco Co., Ltd. Method for regenerating catalyst

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