WO2021171629A1 - Dispositif d'abrasion de catalyseur de dénitration - Google Patents

Dispositif d'abrasion de catalyseur de dénitration Download PDF

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Publication number
WO2021171629A1
WO2021171629A1 PCT/JP2020/008549 JP2020008549W WO2021171629A1 WO 2021171629 A1 WO2021171629 A1 WO 2021171629A1 JP 2020008549 W JP2020008549 W JP 2020008549W WO 2021171629 A1 WO2021171629 A1 WO 2021171629A1
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WIPO (PCT)
Prior art keywords
denitration catalyst
runway
holes
polishing
flow path
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PCT/JP2020/008549
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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
Original Assignee
中国電力株式会社
ハシダ技研工業株式会社
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Application filed by 中国電力株式会社, ハシダ技研工業株式会社 filed Critical 中国電力株式会社
Priority to JP2020535150A priority Critical patent/JPWO2021171629A1/ja
Priority to PCT/JP2020/008549 priority patent/WO2021171629A1/fr
Publication of WO2021171629A1 publication Critical patent/WO2021171629A1/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
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • 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

Definitions

  • the present invention relates to a denitration catalyst polishing device that polishes 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 polish the inner wall of the through hole. Further, a dummy cell having the same or similar through-holes as the denitration catalyst is arranged at the peripheral edge where the flow velocity of the denitration catalyst having a honeycomb structure provided with a plurality of through holes extending in the longitudinal direction is reduced, and the flow velocity is substantially reduced.
  • a configuration is disclosed in which more uniform polishing can be performed by polishing the denitration catalyst only in the uniform central portion.
  • Patent Document 1 can make the amount of polishing of the denitration catalyst uniform in the radial direction.
  • a configuration capable of making the amount of polishing of the denitration catalyst in the flow path direction uniform has not yet been disclosed.
  • 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 apparatus capable of making the amount of polishing of the denitration catalyst uniform in the flow path direction.
  • 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. It has an inflow path arranged on the upstream side of the denitration catalyst and through which the abrasive material flows together with air, and a suction portion arranged on the downstream side of the denitration catalyst and sucking the abrasive and the object to be polished together with air.
  • the inflow path has a runway provided with a plurality of through holes which are arranged in contact with or close to the denitration catalyst and extend linearly, and the plurality of through holes of the runway are a plurality of through holes of the denitration catalyst.
  • the present invention relates to a denitration catalyst polishing device arranged at a position corresponding to the through hole of.
  • the cross-sectional shape of the runway with respect to the flow path direction is the same as the cross-sectional shape of the denitration catalyst with respect to the flow path direction.
  • the length of the runway in the flow path direction is preferably longer than the length at which the abrasive material flowing together with the air is turbulently flowed into the through hole of the runway.
  • the present invention can provide a denitration catalyst polishing apparatus capable of uniform polishing of the denitration catalyst in the flow path direction.
  • the denitration catalyst to be polished by the denitration catalyst polishing apparatus is, 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.
  • 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, and a suction fan 70.
  • the denitration catalyst C which is the object to be polished by the denitration catalyst polishing device 1, is sandwiched between the approach path 23 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.
  • 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 abrasive A and the compressed air are mixed inside the blast gun 11 and injected into the funnel portion 12.
  • the injected abrasive A flows into the inflow path 20 through the funnel portion 12 in a state of being uniformly mixed with air.
  • 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 material A flows in together with air.
  • the inflow path 20 includes an upstream side flow path 21, an upstream side fixing member 22, and a runway 23.
  • 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 runway 23.
  • the runway 23 has a honeycomb structure similar to that of the denitration catalyst C, and the downstream side of the runway 23 is connected and fixed to the lower end portion (upstream side end portion) of the denitration catalyst C by a fixing member 24.
  • the configuration of the inflow path 20 including the runway 23 will be described in detail later.
  • 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.
  • FIG. 4 is a vertical cross-sectional view showing the vicinity of the inflow path 20 of the denitration catalyst polishing device 1
  • FIG. 5 is an exploded perspective view showing the vicinity of the inflow path 20 in the same manner.
  • the inflow path 20 includes an upstream side flow path 21, an upstream side fixing member 22, and a runway 23 in this order from the upstream side.
  • the upstream side flow path 21 is a flow path having a bent portion 21a, the upstream side is connected to the funnel portion 12 in the mixing portion 10, and the downstream side is connected to the upstream side fixing member 22. ing.
  • the upstream fixing member 22 is a flow path through which the abrasive A flows together with air. As shown in FIG. 4, the upstream fixing member 22 is a tubular member having a linear flow path inside. The downstream side of the upstream side fixing member 22 is connected to and fixed to the runway 23. The upstream side fixing member 22 may have a regulating member in the flow path.
  • the regulating member is a member that regulates the flow of the abrasive material A mixed with air in order to uniformly disperse the abrasive material A.
  • the regulatory member comprises, for example, one or more mesh members. The mesh member allows a part of the flow of the abrasive A mixed with air to pass through and regulates a part of the flow.
  • the mesh member is arranged, for example, over a part or the whole of the cross section in the flow path direction in the flow path of the upstream side fixing member 22.
  • the mesh member can have an arbitrary aperture ratio, number of meshes, and openings, and can, for example, have an aperture ratio, number of meshes, and openings similar to those of the denitration catalyst C.
  • the runway 23 is a flow path for turbulently flowing the abrasive A that has flowed in from the upstream fixing member 22 together with air and flowing it into the denitration catalyst C.
  • the runway 23 is a honeycomb structure having a plurality of through holes 231 extending linearly inside, similar to the denitration catalyst C.
  • the cross-sectional shape of the runway 23 with respect to the flow path direction is the same as the cross-sectional shape of the denitration catalyst C with respect to the flow path direction.
  • the position, number and size of the through holes 231 in the cross section of the runway 23 with respect to the flow path direction and the position, number and size of the through holes C1 in the cross section of the denitration catalyst C with respect to the flow path direction are the same. It should be noted that “identical” does not have to be completely the same, as long as it can flow into the through hole C1 while the turbulent flow of the abrasive material A in the through hole 231 is maintained. It may be slightly different.
  • the material of the runway 23 is not particularly limited, but for example, a material similar to that of the denitration catalyst C may be used, or a material having a high hardness that is difficult to be polished by the abrasive A may be used.
  • the abrasive A mixed with the air flowing into the through hole 231 of the runway 23 regularly circulates in a laminar flow near the upstream end of the runway 23. After that, the abrasive A passes through a certain distance and is turbulently flowed in the through hole 231 and flows into the through hole C1 of the denitration catalyst C. Since the turbulent abrasive A moves irregularly and turbulently, the frequency of collision with the inner surface of the through hole C1 of the denitration catalyst increases as compared with the laminar flow state. From the above, it is considered that the polishing rate, which is the ratio of the polishing amount to the distribution amount of the polishing material A, is improved.
  • the abrasive A is circulated in a laminar flow near the upstream end of the denitration catalyst C, and then turbulent after a certain distance. Therefore, the polishing rate of the inner surface of the through hole C1 after the position where the polishing material A is turbulent after a certain distance is higher than the polishing rate near the upstream end portion of the denitration catalyst C. Therefore, the amount of polishing of the through hole C1 in the flow path direction becomes non-uniform.
  • the abrasive A mixed with air is turbulent in the runway 23 and then flows into the denitration catalyst C.
  • the polishing rate of the abrasive A that flows into the denitration catalyst C together with the air is sufficiently high from the upstream end portion. That is, the polishing rate of the inner surface of the through hole C1 by the abrasive A can be stabilized in a high state regardless of the position from the upstream end portion. Therefore, the amount of polishing of the through hole C1 in the flow path direction can be made uniform.
  • the downstream end of the runway 23 is arranged in close proximity to or in contact with the upstream end of the denitration catalyst C. Further, the runway 23 is arranged at a position corresponding to the positions of the plurality of through holes 231 of the runway 23 with respect to the plurality of through holes C1 of the denitration catalyst C.
  • the correspondence between the positions of the through holes C1 and the through holes 231 includes not only the case where the positions of the through holes are the same but also the case where they overlap at least in the flow path direction. It is preferable that the positions of the through hole C1 and the through hole 231 are the same.
  • the runway 23 is arranged so that the flow path direction of the through hole 231 and the flow path direction of the through hole C1 are the same, and the plurality of through holes 231 and the through hole C1 each form a continuous flow path. ..
  • the turbulent abrasive material A in the through hole 231 can flow into the through hole C1 while the turbulence is maintained.
  • a protective member may be arranged between the runway 23 and the denitration catalyst C for the purpose of protecting the end surface of the upstream end portion of the denitration catalyst C.
  • the protective member is made of, for example, a mesh member corresponding to the shape of the through hole C1.
  • the length L of the runway 23 in the flow path direction shown in FIG. 5 is required for the abrasive material A mixed with the air flowing into the runway 23 to be turbulent and stabilized in a state where the polishing rate is high. It is longer than the length.
  • the length L of the runway 23 in the flow path direction is, for example, 150 mm or more, preferably 200 mm or more, and more preferably 250 mm or more.
  • the fixing member 24 is a member that detachably connects and fixes the downstream end of the runway 23 and the upstream end of the denitration catalyst C.
  • the configuration of the fixing member 24 is not particularly limited.
  • the fixing member 24 may be an annular member capable of fixing the runway 23 and the denitration catalyst C by, for example, covering the connecting portion between the runway 23 and the denitration catalyst C from the outer circumference and tightening the connecting portion.
  • 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 runway 23 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 runway 23 via the upstream flow path 21 and the upstream fixing member 22.
  • the turbulent polishing material A in the runway 23 flows into the through hole C1 of the denitration catalyst C in a stable state with a high polishing rate, polishes the inner surface of the through hole C1, and then the downstream fixing member.
  • Outflow from 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 and the like adhering to the inner surface of the through hole C1.
  • the denitration catalyst polishing device 1 is arranged on the upstream side of the denitration catalyst C and is arranged on the inflow path 20 through which the abrasive A flows together with air, and on the downstream side of the denitration catalyst C.
  • the inflow path 20 has a runway 23 which is arranged in contact with or close to the denitration catalyst C and is provided with a plurality of through holes 231 extending linearly.
  • the plurality of through holes 231 of the runway 23 are arranged at positions corresponding to the plurality of through holes C1 of the denitration catalyst C.
  • the abrasive A is turbulent when flowing through the plurality of through holes 231 provided in the runway 23 together with the air, and flows into the denitration catalyst C. Therefore, the polishing rate of the inner surface of the through hole C1 is stabilized in a high state, and the polishing amount of the denitration catalyst C in the flow path direction can be made uniform.
  • the cross-sectional shape of the runway 23 with respect to the flow path direction is the same as the cross-sectional shape of the denitration catalyst C with respect to the flow path direction.
  • the plurality of through holes 231 of the runway 23 and the plurality of through holes C1 of the denitration catalyst C can be arranged so as to form a continuous flow path having the same flow path diameter. Therefore, the abrasive material A turbulent with air in the through hole 231 of the runway 23 can flow into the through hole C1 while the turbulence is surely maintained, and the flow path of the denitration catalyst C can be flowed.
  • the amount of polishing in the direction can be made more uniform.
  • the length L of the runway 23 in the flow path direction is assumed to be longer than the length at which the abrasive A flowing together with the air is turbulently flowed through the through hole 231 of the runway 23.
  • the abrasive A flowing through the through hole 231 together with the air flows into the through hole C1 of the denitration catalyst C in a state of being surely turbulent. Therefore, the polishing rate of the inner surface of the through hole C1 is surely stabilized in a high state, and the polishing amount in the flow path direction of the denitration catalyst can be further made uniform.
  • the present invention is not limited to the above embodiment, and can be appropriately modified.
  • the denitration catalyst polishing apparatus 1 has been described as having a mixing unit 10 and the polishing material A mixed with air by the mixing unit 10 flowing into the denitration catalyst C through the inflow path 20. It is not limited to the configuration.
  • the denitration catalyst polishing device 1 may have a structure for sucking the polishing agent A together with air, and may be configured without the mixing unit 10.
  • the inflow path 20 has been described as having the upstream side flow path 21 having the bent portion 21a, the present invention is not limited to this configuration.
  • the inflow path 20 can also be configured without providing a bent portion.
  • the inflow path 20 may have a linear flow path for vertically sucking the abrasive A together with air from the lower part of the denitration catalyst C, and may have a configuration having no bent portion.
  • the upstream fixing member 22 has been described as having a regulating member composed of one or a plurality of mesh members in the flow path, the present invention is not limited to this configuration.
  • the regulating member may be any as long as it regulates and disperses the flow of the abrasive A mixed with air.
  • the shape of the regulating member is not limited to the mesh member, and may be, for example, a plate-shaped member arranged in a part of the cross section of the upstream fixing member 22 in the flow path direction.
  • it can be configured without providing the restricting member in the flow path of the upstream fixing member 22.
  • the uniformity of the polishing amount of the denitration catalyst was evaluated by the following method.
  • the used denitration catalyst (the length of the runway: 250 mm) was mounted on the denitration catalyst polishing apparatus (length of the approach path: 250 mm) according to the present embodiment, and the polishing agent was circulated through the through holes for a predetermined time to perform polishing.
  • the denitration catalyst was removed, cut in 100 mm increments from the downstream end, and the wall thickness of the denitration catalyst was measured at several points to calculate the average value.
  • using a denitration catalyst polishing device that does not have a runway.
  • the wall thickness of the denitration catalyst after polishing was calculated. The results are shown in Table 1 below.
  • the denitration catalyst polished by the denitration catalyst polishing apparatus according to the present embodiment having a runway has a wall thickness after polishing that is substantially constant at any location in the flow path direction. , The result that the polishing was performed uniformly was shown.
  • the denitration catalyst wall thickness near the upstream end (860 mm) is thicker than the wall thickness of other parts, and the result shows that polishing is not uniform.
  • the wall thickness was stabilized and the polishing was uniform after the portion where the length from the upstream end was 150 mm, preferably 200 mm, more preferably 250 mm or more.
  • Denitration catalyst polishing device 20 Inflow path 23 Runway 70 Suction fan (suction section) C Denitration catalyst C1 Through hole 231 of denitration catalyst C Through hole of runway 23 L Length of runway 23 in the flow path direction

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Abstract

L'objectif de la présente invention est de fournir un dispositif d'abrasion de catalyseur de dénitration qui est capable d'égaliser le degré d'abrasion d'un catalyseur de dénitration dans la direction du trajet d'écoulement.　La présente invention comprend : un trajet d'entrée 20 qui est positionné sur le côté amont d'un catalyseur de dénitration C pourvu d'une pluralité de trous traversants qui s'étendent dans la direction longitudinale, et qui transporte un matériau abrasif A conjointement avec de l'air ; et un ventilateur d'admission 70 qui est positionné sur le côté aval du catalyseur de dénitration C et aspire le matériau abrasif A, l'air, et des copeaux d'abrasion. Le trajet d'entrée 20 présente un trajet d'approche qui est positionné de manière à être en contact avec ou à proximité du catalyseur de dénitration C, et est pourvu d'une pluralité de trous traversants 231 qui s'étendent sous une forme linéaire. La pluralité de trous traversants 231 sont positionnés à des positions correspondant à la pluralité de trous traversants C1. Le matériau abrasif A qui a été rendu turbulent avec l'air dans la pluralité de trous traversants 231 s'écoule dans les trous traversants C1, ce qui garantit un taux d'abrasion élevé dans la direction du trajet d'écoulement et permet d'égaliser le degré d'abrasion du catalyseur de dénitration C.
PCT/JP2020/008549 2020-02-28 2020-02-28 Dispositif d'abrasion de catalyseur de dénitration WO2021171629A1 (fr)

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PCT/JP2020/008549 WO2021171629A1 (fr) 2020-02-28 2020-02-28 Dispositif d'abrasion de catalyseur de dénitration

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62241555A (ja) * 1986-04-11 1987-10-22 Kawasaki Heavy Ind Ltd 触媒の乾式再生方法
JPH02245241A (ja) * 1989-03-20 1990-10-01 Ishikawajima Harima Heavy Ind Co Ltd 触媒の再生装置
JPH07116523A (ja) * 1993-10-28 1995-05-09 Ishikawajima Harima Heavy Ind Co Ltd 脱硝触媒の再生方法および再生装置
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
WO2018211549A1 (fr) * 2017-05-15 2018-11-22 中国電力株式会社 Dispositif de broyage pour catalyseurs de dénitrification

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62241555A (ja) * 1986-04-11 1987-10-22 Kawasaki Heavy Ind Ltd 触媒の乾式再生方法
JPH02245241A (ja) * 1989-03-20 1990-10-01 Ishikawajima Harima Heavy Ind Co Ltd 触媒の再生装置
JPH07116523A (ja) * 1993-10-28 1995-05-09 Ishikawajima Harima Heavy Ind Co Ltd 脱硝触媒の再生方法および再生装置
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
WO2018211549A1 (fr) * 2017-05-15 2018-11-22 中国電力株式会社 Dispositif de broyage pour catalyseurs de dénitrification

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