WO2021171624A1 - 脱硝触媒研磨装置 - Google Patents

脱硝触媒研磨装置 Download PDF

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Publication number
WO2021171624A1
WO2021171624A1 PCT/JP2020/008544 JP2020008544W WO2021171624A1 WO 2021171624 A1 WO2021171624 A1 WO 2021171624A1 JP 2020008544 W JP2020008544 W JP 2020008544W WO 2021171624 A1 WO2021171624 A1 WO 2021171624A1
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WIPO (PCT)
Prior art keywords
denitration catalyst
flow path
upstream
air
regulating member
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Application number
PCT/JP2020/008544
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English (en)
French (fr)
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 PCT/JP2020/008544 priority Critical patent/WO2021171624A1/ja
Priority to JP2020535144A priority patent/JPWO2021171624A1/ja
Publication of WO2021171624A1 publication Critical patent/WO2021171624A1/ja

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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 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.
  • 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 uniformly dispersing the abrasive material flowing into the denitration catalyst and uniformly polishing 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.
  • a mixing section arranged on the upstream side of the denitration catalyst to mix the abrasive and air, an inflow path arranged between the mixing section and the denitration catalyst, and a flow path through which the abrasive mixed with air flows.
  • the present invention relates to a denitration catalyst polishing apparatus having a second regulating member arranged in a portion.
  • the inflow path has an upstream fixing member for fixing the denitration catalyst and an upstream flow path arranged on the upstream side of the upstream fixing member and having a bent portion, and has a flow of the upstream fixing member.
  • the road direction is the same as the flow path direction of the through hole, and the cushioning member, the first regulating member, and the second regulating member may be arranged in the flow path of the upstream fixing member. preferable.
  • the first regulating member and the second regulating member may have a substantially rectangular parallelepiped shape and may be arranged so that the longitudinal direction is orthogonal to the inflow direction of the upstream flow path.
  • the second regulating member comprises an outer regulating portion arranged in the outer direction of the bent portion and an inner regulating portion arranged in the inner direction of the bent portion, and is formed in a cross section of a flow path of the outer regulating portion.
  • the area occupied may be larger than the area occupied in the cross section of the flow path of the inner regulation portion.
  • the first regulating member and the second regulating member may have a substantially rectangular parallelepiped shape and may be arranged so that the longitudinal direction is parallel to the inflow direction of the upstream flow path.
  • the cushioning member is composed of two or more mesh members, and at least one set of openings of the mesh members are arranged at positions deviated from each other with respect to the flow path direction.
  • the present invention can provide a denitration catalyst polishing apparatus capable of uniformly dispersing the abrasive material flowing into the denitration catalyst and uniformly polishing the denitration catalyst.
  • 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 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.
  • 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 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 configurations of the upstream side flow path 21 and the upstream side fixing member 22 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 has an upstream side flow path 21 having a bent portion 21a. Then, the abrasive A mixed with air in the mixing portion 10 is circulated from below the denitration catalyst C through the upstream side flow path 21 having the bent portion 21a. With the above configuration, the mixing unit 10 and the denitration catalyst C can be juxtaposed. On the other hand, since the upstream flow path 21 has the bent portion 21a, the distribution of the abrasive A flowing into the denitration catalyst C tends to be biased. However, it is not preferable to provide a long flow path in order to disperse the abrasive A.
  • the upstream fixing member 22 with the cushioning member and the regulating member described below, the flow path in the subsequent stage of the bent portion 21a can be compactly configured, and the abrasive material A is sufficient. A dispersion effect can be obtained.
  • the upstream side fixing member 22 fixes the lower end portion (upstream side end portion) of the denitration catalyst C, and has a linear flow path inside through which the abrasive A mixed with air flows. As shown in FIGS. 4 and 5, the flow path direction of the upstream fixing member 22 is the same as the flow path direction of the through hole of the denitration catalyst C. That is, the flow path direction of the upstream fixing member 22 is substantially perpendicular to the horizontal plane. In the flow path of the upstream side fixing member 22, a cushioning member 22a, a first regulating member 22b, and a second regulating member 22c are provided in this order from above.
  • the cushioning member 22a is a member that reduces the flow velocity of the abrasive material A mixed with air, and also has the effect of dispersing the abrasive material A.
  • the cushioning member 22a is composed of two mesh members 22a1 and 22a2. By reducing the flow velocity of the abrasive A by the buffer member 22a, it is possible to suppress damage to the upstream end portion of the denitration catalyst C.
  • an end face protective material P that comes into contact with the upstream end of the denitration catalyst C may be further provided.
  • the end face protective material P is made of, for example, a mesh member corresponding to the shape of the through hole C1 of the denitration catalyst C. By providing such an end face protective material P, damage to the upstream end portion of the denitration catalyst C can be further suppressed.
  • the mesh members 22a1 and 22a2 have an arbitrary aperture ratio, number of meshes, and openings. If the aperture ratio is too large, the mesh member is likely to be damaged, and if it is too small, the pressure loss of the upstream fixing member 22 becomes large.
  • the aperture ratio can be, for example, about the same as the aperture ratio of the denitration catalyst C. Further, the number of meshes and the opening of the mesh members 22a1 and 22a2 can be set to the same level as the denitration catalyst C. It is preferable that the openings of the two mesh members 22a1 and 22a2 are arranged so as to be offset from each other with respect to the flow path direction of the upstream fixing member 22.
  • the mesh members 22a1 and 22a2 can be arranged so that the openings are displaced.
  • the number of meshes in the cross section of the flow path of the mesh member 22a1 may be 21 ⁇ 21
  • the number of meshes in the cross section of the flow path of the mesh member 22a2 may be 20 ⁇ 20, which is equal to the number of through holes C1 of the denitration catalyst C. can.
  • the number of meshes of the mesh members 22a1 and 22a2 may be the same, and the mesh members 22a1 and 22a2 may be arranged so that the openings are displaced.
  • the first regulating member 22b is a member having a substantially rectangular parallelepiped shape, which is arranged at the central portion in the cross section of the flow path of the upstream fixing member 22. Both ends of the first regulating member 22b are in contact with and fixed to the inner surface of the flow path of the upstream fixing member 22.
  • the longitudinal direction of the first regulating member 22b is arranged so as to be orthogonal to the inflow direction of the upstream flow path 21 indicated by the white arrow in FIGS. 4 and 5. Further, the lower surface of the first regulating member 22b is arranged so as to be substantially perpendicular to the flow path direction of the upstream fixing member 22.
  • the second regulating member 22c is arranged at both ends in the cross section of the flow path of the upstream fixing member 22, and is composed of two second regulating members 22c1 and 22c2 having a substantially rectangular parallelepiped shape. Both ends of the second regulating member 22c1 and 22c2 are in contact with and fixed to the inner surface of the flow path of the upstream fixing member 22.
  • the longitudinal directions of the second regulating members 22c1 and 22c2 are arranged so as to be orthogonal to the inflow direction of the upstream flow path 21 indicated by the white arrows in FIGS. 4 and 5.
  • the second regulating member 22c1 is an outer regulating portion arranged in the outer direction of the bent portion 21a of the upstream side flow path 21, and the second regulating member 22c2 is an inner direction of the bent portion 21a of the upstream side flow path 21. It is an inner regulation part located in.
  • the lower surfaces of the second regulating members 22c1 and 22c2 are arranged so as to be substantially perpendicular to the flow path direction of the upstream fixing member 22.
  • the area occupied by the cross section of the flow path of the second regulating member 22c1, that is, the area of the lower surface is larger than the area of the lower surface of the second regulating member 22c2.
  • the first regulating member 22b and the second regulating member 22c regulate and disperse the flow of the abrasive A mixed with the air flowing through the upstream fixing member 22.
  • the first regulating member 22b and the second regulating member 22c may be a member that completely blocks the flow, or may be a member such as a mesh member that blocks most of the flow and allows a part of the flow to pass through.
  • 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, polishes the inner surface of the through hole C1, and then 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 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 connects the mixing unit 10 that mixes the polishing material A and air, and the mixing unit 10 and the denitration catalyst C, and is a polishing material mixed with air. It has an inflow path 20 through which A flows and a suction fan 70 which is arranged on the downstream side of the denitration catalyst C and sucks the abrasive A and the object to be polished together with air.
  • the buffer member 22a On the upstream side of the buffer member 22a and in the central portion of the flow path cross section of the inflow path 20, and on the upstream side of the first regulating member 22b and in the flow path cross section of the inflow path 20. It is configured to have a second regulating member 22c arranged at both ends. As a result, the flow velocity of the abrasive A mixed with air can be reduced by the buffer member 22a. Further, since the abrasive material A mixed with air can be dispersed by the first regulating member 22b and the second regulating member 22c, the denitration catalyst C can be uniformly polished.
  • the inflow path 20 is arranged on the upstream side of the denitration catalyst C, and the upstream side fixing member 22 whose flow path direction is the same as the flow path direction of the through hole of the denitration catalyst C and the upstream side of the upstream side fixing member 22.
  • the upstream side flow path 21 having the bent portion 21a is provided, and the cushioning member 22a, the first regulation member 22b, and the second regulation member 22c are provided in the flow path of the upstream side fixing member 22.
  • the first regulating member 22b and the second regulating member 22c were arranged so that the longitudinal direction was orthogonal to the inflow direction of the upstream flow path 21. As a result, when the upstream flow path 21 has the bent portion 21a, the effect of dispersing the abrasive A can be preferably obtained.
  • the area occupied by the outer regulation portion 22c1 in the flow path cross section is larger than the area occupied by the inner regulation portion 22c2 in the flow path cross section.
  • the cushioning member 22a was configured as two mesh members 22a1 and 22a2, and the openings of the mesh members 22a1 and 22a2 were arranged at positions deviated from each other with respect to the flow path direction.
  • the abrasive material A collides with either of the two mesh members 22a1 and 22a2, and the flow velocity is reduced and the possibility of being dispersed increases. Therefore, the flow velocity of the abrasive material A is reduced and the abrasive material A is reduced.
  • the effect of dispersing is preferably obtained.
  • FIG. 6 is an exploded perspective view showing the configuration of the inflow path 20 of the denitration catalyst polishing device 1A according to the present embodiment.
  • the configuration other than the inflow path 20 of this embodiment is the same as that of the first embodiment.
  • the inflow path 20 includes an upstream side flow path 21 and an upstream side fixing member 22 as in the first embodiment.
  • the upstream side flow path 21 has a bent portion 21a.
  • the upstream fixing member 22 has a cushioning member 22a, a first regulating member 22b, and a second regulating member 22c.
  • the cushioning member 22a is composed of two mesh members 22a1 and 22a2 as in the first embodiment.
  • the first regulation member 22b is a member having a substantially rectangular parallelepiped shape arranged at the central portion in the cross section of the flow path, as in the first embodiment.
  • the lower surface of the first regulating member 22b is arranged so as to be substantially perpendicular to the flow path direction of the upstream fixing member 22.
  • the second regulating member 22c is composed of the second regulating members 22c3 and 22c4, and is a member having a substantially rectangular parallelepiped shape arranged at both ends in the cross section of the flow path as in the first embodiment.
  • the lower surfaces of the second regulating members 22c1 and 22c2 are arranged so as to be substantially perpendicular to the flow path direction of the upstream fixing member 22.
  • the longitudinal directions of the first regulating member 22b and the second regulating member 22c are arranged so as to be parallel to the inflow direction of the upstream flow path 21 indicated by the white arrow in FIG. Further, the areas occupied by the second regulating member 22c3 and the second regulating member 22c4 in the cross section of the flow path are substantially the same.
  • the effect of dispersing the abrasive A mixed with air can also be preferably obtained by the first regulating member 22b and the second regulating member 22c according to the second embodiment.
  • FIG. 7 is a perspective view showing the configuration of the denitration catalyst C fixed to the denitration catalyst polishing apparatus 1B according to the present embodiment, and the vicinity of the upstream side fixing member 22 and the downstream side fixing member 32.
  • the denitration catalyst polishing device 1B has rotation mechanisms R1 and R2.
  • the rotation mechanisms R1 and R2 rotatably support the denitration catalyst C about the flow path direction of the through hole C1 of the denitration catalyst C.
  • the denitration catalyst C is rotated by the rotation mechanisms R1 and R2 while the denitration catalyst C is being polished.
  • the inner surface of the through hole of the denitration catalyst C can be uniformly polished even when the distribution of the abrasive A flowing into the denitration catalyst C is biased due to the shape of the inflow path 20.
  • the rotation mechanisms R1 and R2 have a drive unit such as a motor, and can rotate the denitration catalyst C.
  • the rotation speed of the denitration catalyst C is not particularly limited.
  • the rotation angle at the time T is preferably 360 degrees ⁇ n.
  • the rotation mechanisms R1 and R2 may rotate the denitration catalyst C at all times, or may rotate the denitration catalyst C by a predetermined angle every time a certain period of time elapses.
  • the rotation mechanisms R1 and R2 can be configured so that the rotation angle of the denitration catalyst C at the time T is 360 degrees and the denitration catalyst C is rotated 90 degrees each time the time 1/4 T elapses.
  • the rotation mechanism R1 is arranged between the upstream fixing member 22 and the denitration catalyst C.
  • the rotation mechanism R2 is arranged between the downstream fixing member 32 and the denitration catalyst C.
  • the structures of the rotation mechanisms R1 and R2 are not particularly limited as long as they can rotatably support the denitration catalyst C.
  • the present invention is not limited to the above embodiment, and can be appropriately modified.
  • the cushioning member 22a according to the first embodiment has been described as being composed of two mesh members 22a1 and 22a2, the present invention is not limited to this configuration.
  • the cushioning member 22a may be composed of three or more mesh members. In that case, it is preferable that the openings of at least one set of mesh members are arranged at positions deviated from each other with respect to the flow path direction.
  • the first regulating member 22b and the second regulating member 22c according to the above embodiment are arranged so as to have a substantially rectangular parallelepiped shape and the lower surface thereof is substantially perpendicular to the flow path direction of the upstream fixing member 22.
  • the configuration is not limited to this configuration.
  • the first regulating member 22b and the second regulating member 22c may have a shape other than a rectangular parallelepiped. Further, the lower surface may be inclined rather than perpendicular to the flow path direction of the downstream fixing member 22. Further, the angles of the first regulating member 22b and the second regulating member 22c with respect to the flow path direction may be changed.
  • the rotation mechanisms R1 and R2 according to the other embodiments may be combined with the configuration of the upstream fixing member 22 according to the first embodiment and the second embodiment. As a result, the denitration catalyst C can be polished more uniformly.
  • Denitration catalyst polishing device 10 Mixing part 20 Inflow path 21 Upstream side flow path 22 Upstream side fixing member 22a Buffer member 22a1 Mesh member 22a2 Mesh member 22b First regulation member 22c Second regulation member 70 Suction fan (suction part) C denitration catalyst C1 through hole

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  • Chemical Kinetics & Catalysis (AREA)
  • Sustainable Development (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
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PCT/JP2020/008544 2020-02-28 2020-02-28 脱硝触媒研磨装置 WO2021171624A1 (ja)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62289292A (ja) * 1986-06-09 1987-12-16 Nippon Koden Kk 中和処理装置に於ける混合選別槽
JP2008207063A (ja) * 2007-02-23 2008-09-11 Fujio Hori 粉粒体混合ガス生成機
WO2014155628A1 (ja) * 2013-03-28 2014-10-02 中国電力株式会社 脱硝触媒の再生方法
WO2018025890A1 (ja) * 2016-08-05 2018-02-08 サンスター技研株式会社 ペースト材料とガスとの混合装置及び方法
WO2018211549A1 (ja) * 2017-05-15 2018-11-22 中国電力株式会社 脱硝触媒の研削装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62289292A (ja) * 1986-06-09 1987-12-16 Nippon Koden Kk 中和処理装置に於ける混合選別槽
JP2008207063A (ja) * 2007-02-23 2008-09-11 Fujio Hori 粉粒体混合ガス生成機
WO2014155628A1 (ja) * 2013-03-28 2014-10-02 中国電力株式会社 脱硝触媒の再生方法
WO2018025890A1 (ja) * 2016-08-05 2018-02-08 サンスター技研株式会社 ペースト材料とガスとの混合装置及び方法
WO2018211549A1 (ja) * 2017-05-15 2018-11-22 中国電力株式会社 脱硝触媒の研削装置

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