WO2021171624A1 - Denitration catalyst abrasion device - Google Patents

Denitration catalyst abrasion device 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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WO
WIPO (PCT)
Prior art keywords
denitration catalyst
flow path
upstream
air
regulating member
Prior art date
Application number
PCT/JP2020/008544
Other languages
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 JP2020535144A priority Critical patent/JPWO2021171624A1/ja
Priority to PCT/JP2020/008544 priority patent/WO2021171624A1/en
Publication of WO2021171624A1 publication Critical patent/WO2021171624A1/en

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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

Abstract

The purpose of the present invention is to provide a denitration catalyst abrasion device which uniformly distributes an abrasive material flowing into a denitration catalyst, and thus is capable of uniformly abrading the denitration catalyst.　This denitration catalyst abrasion device 1 causes an abrasive material A and air to flow through through holes C1 in a denitration catalyst C, and abrades the inner surfaces of the through holes C1. A mixing unit 10 for mixing the abrasive material and air is positioned on the upstream side of the denitration catalyst C. An inflow path 20 through which the abrasive material A mixed with air flows is positioned between the mixing unit 10 and the denitration catalyst C. An intake fan 70 for drawing in the abrasive material A, the air, and abrasion swarf is positioned on the downstream side of the denitration catalyst C. The inflow path 20 has a buffer member 22a for reducing the flow rate of the abrasive material A mixed with air, a first restriction member 22b that is disposed in the center part of the cross section of the flow path, and second restriction members 22c that are disposed at both ends of the cross section of the flow path. Thus, it is possible to evenly disperse the abrasive material A and uniformly abrade the denitration catalyst C.

Description

脱硝触媒研磨装置Denitration catalyst polishing device
　本発明は、脱硝触媒を研磨する、脱硝触媒研磨装置に関する。 The present invention relates to a denitration catalyst polishing device that polishes a denitration catalyst.
　火力発電所では、石炭燃焼に伴い窒素酸化物が発生する。環境保全のため、窒素酸化物の排出量は一定水準以下に抑える必要がある。このため、火力発電所には窒素酸化物を還元するための脱硝触媒が充てんされた脱硝装置が設置されている。脱硝触媒は、使用の継続に伴い性能が低下する。性能の低下した脱硝触媒を再生する技術の一つとして研磨再生が挙げられる。研磨再生は、性能の低下した脱硝触媒の表面を研磨することで、触媒性能を回復させる技術である。 At thermal power plants, nitrogen oxides are generated as coal burns. To protect the environment, it is necessary to keep nitrogen oxide emissions below a certain level. For this reason, a denitration device filled with a denitration catalyst for reducing nitrogen oxides is installed in a thermal power plant. The performance of the denitration catalyst deteriorates as the use continues. 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.
国際公開第２０１４／１５５６２８号International Publication No. 2014/155628
　特許文献１には、研磨材（研削材）と気体との混合物を脱硝触媒の貫通孔に通過させて、貫通孔の内壁を研削する脱硝触媒の再生方法に関する技術が開示されている。脱硝触媒からなる被研削部材の一端部には、当該被研削部材の断面積より大きな断面積の拡開部を具備する上流固定部材が連結される。当該拡開部には、スクリーン部材が配置される。このような拡開部内で、研磨材と気体との混合物は流速が低下されると共に分散され、貫通孔の内壁の均一な研削が可能となる。 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.
　特許文献１に開示された技術は、研磨材と気体との混合物の流速を低下させ、かつ十分に分散させるため、上流固定部材の流路長を一定以上の長さにする必要がある。しかし、上流固定部材の流路長を長くすると、研磨装置をコンパクトに構成できない課題があった。 In the technique disclosed in Patent Document 1, in order to reduce the flow velocity of the mixture of the abrasive and the gas and sufficiently disperse the mixture, it is necessary to make the flow path length of the upstream fixing member a certain length or more. However, if the flow path length of the upstream fixing member is lengthened, there is a problem that the polishing apparatus cannot be compactly configured.
　本発明は、上記に鑑みてなされたものであり、脱硝触媒に流入する研磨材を均一に分散させ、脱硝触媒を均一に研磨できる脱硝触媒研磨装置を提供することを目的とする。 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.
　本発明は、長手方向に延びる複数の貫通孔が設けられた脱硝触媒の前記貫通孔に、空気と共に研磨材を流通させて、前記貫通孔の内面を研磨する脱硝触媒研磨装置であって、前記脱硝触媒の上流側に配置され、研磨材と空気とを混合する混合部と、前記混合部と、前記脱硝触媒との間に配置され、空気と混合された研磨材が流通する流入路と、前記脱硝触媒の下流側に配置され、空気と共に研磨材と被研磨物とを吸引する吸引部と、を有し、前記流入路は、空気と混合された研磨材の流速を低下させる緩衝部材と、前記緩衝部材の上流側、かつ前記流入路の流路横断面における中央部に配置される第１規制部材と、前記第１規制部材の上流側、かつ前記流入路の流路横断面における両端部に配置される第２規制部材と、を有する脱硝触媒研磨装置に関する。 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. It has a suction part which is arranged on the downstream side of the denitration catalyst and sucks the abrasive material and the object to be polished together with air, and the inflow path is a buffer member which reduces the flow velocity of the abrasive material mixed with air. The first regulating member arranged on the upstream side of the cushioning member and at the center of the flow path cross section of the inflow path, and both ends on the upstream side of the first regulating member and in the flow path cross section of the inflow path. The present invention relates to a denitration catalyst polishing apparatus having a second regulating member arranged in a portion.
　前記流入路は、前記脱硝触媒を固定する上流側固定部材と、前記上流側固定部材の上流側に配置され、屈曲部を有する上流側流路と、を有し、前記上流側固定部材の流路方向は、前記貫通孔の流路方向と同一方向であり、前記緩衝部材、前記第１規制部材、及び前記第２規制部材は、前記上流側固定部材の流路内に配置されることが好ましい。 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.
　前記第１規制部材及び前記第２規制部材は、略直方体形状を有し、前記上流側流路の流入方向に対し、長手方向が直交するように配置されていてもよい。 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.
　前記第２規制部材は、前記屈曲部の外側方向に配置される外側規制部と、前記屈曲部の内側方向に配置される内側規制部と、からなり、前記外側規制部の流路横断面に占める面積は、前記内側規制部の流路横断面に占める面積よりも大きくてもよい。 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.
　前記第１規制部材及び前記第２規制部材は、略直方体形状を有し、前記上流側流路の流入方向に対し、長手方向が平行になるように配置されていてもよい。 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.
　前記緩衝部材は、２つ以上のメッシュ部材からなり、少なくとも１組の前記メッシュ部材の開口部は、流路方向に対して互いにずれた位置に配置されることが好ましい。 It is preferable that 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.
　本発明は、脱硝触媒に流入する研磨材を均一に分散させ、脱硝触媒を均一に研磨できる脱硝触媒研磨装置を提供できる。 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.
本実施形態に係る脱硝触媒が使用される火力発電設備の構成図である。It is a block diagram of the thermal power generation facility which uses the denitration catalyst which concerns on this embodiment. 火力発電設備における脱硝装置の構成例を示す図である。It is a figure which shows the configuration example of the denitration device in a thermal power generation facility. 第１実施形態に係る脱硝触媒研磨装置の概略構成図である。It is a schematic block diagram of the denitration catalyst polishing apparatus which concerns on 1st Embodiment. 第１実施形態に係る脱硝触媒研磨装置の要部断面図である。It is sectional drawing of the main part of the denitration catalyst polishing apparatus which concerns on 1st Embodiment. 第１実施形態に係る脱硝触媒研磨装置の要部分解斜視図である。It is an exploded perspective view of the main part of the denitration catalyst polishing apparatus which concerns on 1st Embodiment. 第２実施形態に係る脱硝触媒研磨装置の要部分解斜視図である。It is an exploded perspective view of the main part of the denitration catalyst polishing apparatus which concerns on 2nd Embodiment. 他の実施形態に係る脱硝触媒研磨装置の要部拡大図である。It is an enlarged view of the main part of the denitration catalyst polishing apparatus which concerns on another embodiment.
　以下、本発明の実施形態について説明する。
　本発明の実施形態に係る脱硝触媒研磨装置の被研磨対象である脱硝触媒は、例えば、以下説明する石炭火力発電設備１００で一定期間使用され、性能の低下した脱硝触媒Ｃである。 Hereinafter, embodiments of the present invention will be described.
The denitration catalyst to be polished by the denitration catalyst polishing apparatus according to the embodiment of the present invention 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.
［石炭火力発電設備］
　図１に示すように、石炭火力発電設備１００は、石炭バンカ１１０と、給炭機１１５と、微粉炭機１２０と、微粉炭供給管１３０と、燃焼ボイラ１４０と、燃焼ボイラ１４０の下流側に設けられる排気通路１５０と、この排気通路１５０に設けられる脱硝装置１６０、空気予熱器１７０、熱回収用ガスヒータ１８０、電気集塵装置１９０、誘引通風機２１０、湿式脱硫装置２２０、再加熱用ガスヒータ２３０、脱硫通風機２４０、及び煙突２５０と、を備える。 [Coal-fired power generation equipment]
As shown in FIG. 1, 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.
　石炭バンカ１１０は、図示しない石炭サイロから運炭設備により供給される石炭を貯蔵する。給炭機１１５は、石炭バンカ１１０から供給される石炭を所定の供給スピードで微粉炭機１２０に供給する。
　微粉炭機１２０は、給炭機１１５から供給された石炭を平均粒径６０μｍ～８０μｍに粉砕して微粉炭を製造する。微粉炭機１２０としては、ローラミル、チューブミル、ボーラミル、ビータミル、インペラーミル等が用いられる。 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 μm to 80 μm. As the pulverized coal machine 120, a roller mill, a tube mill, a bora mill, a beater mill, an impeller mill and the like are used.
　燃焼ボイラ１４０は、微粉炭供給管微粉炭機１３０から供給された微粉炭を、強制的に供給された空気と共に微粉炭バーナｂにより燃焼する。微粉炭を燃焼することによりクリンカアッシュ及びフライアッシュなどの石炭灰が生成されると共に、排ガスが発生する。クリンカアッシュとは、石炭灰のうち、燃焼ボイラ１４０の底部に落下する塊状の石炭灰をいう。フライアッシュとは、石炭灰のうち、排ガスと共に排気通路１５０側に流通する、粒径の小さい（粒径２００μｍ程度以下）の石炭灰をいう。
　排気通路１５０は、燃焼ボイラ１４０の下流側に配置され、燃焼ボイラ１４０で発生した排ガス及び石炭灰を流通させる。 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 μm 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.
　脱硝装置１６０は、排ガス中の窒素酸化物を除去する。脱硝装置１６０は、例えば、乾式アンモニア接触還元法により排ガス中の窒素酸化物を除去する。乾式アンモニア接触還元法は、比較的高温（３００℃～４００℃）の排ガス中に還元剤としてアンモニアガスを注入し、脱硝触媒との作用により排ガス中の窒素酸化物を窒素と水蒸気に分解する方法である。 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.
　脱硝装置１６０は、図２に示すように、脱硝反応が行われる脱硝反応器１６１と、脱硝反応器１６１の内部に配置される複数段の脱硝触媒層１６２とを備える。脱硝触媒層１６２は、複数のケーシング１６３により構成される。ケーシング１６３には、複数の脱硝触媒Ｃが収容される。
　脱硝触媒Ｃは、長手方向に延びる複数の貫通孔Ｃ１が形成されたハニカム構造を有する、長尺状（直方体状）の触媒である。複数の脱硝触媒Ｃは、貫通孔Ｃ１の延びる方向が排ガスの流路に沿うように配置される。 As shown in FIG. 2, 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.
　空気予熱器１７０は、排気通路１５０における脱硝装置１６０の下流側に配置される。空気予熱器１７０は、脱硝装置１６０を通過した排ガスと燃焼用空気とを熱交換させ、排ガスを冷却すると共に、燃焼用空気を加熱する。加熱された燃焼用空気は、押込通風機１７５によりボイラ１４０に供給される。 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.
　熱回収用ガスヒータ１８０は、排気通路１５０における空気予熱器１７０の下流側に配置される。熱回収用ガスヒータ１８０には、空気予熱器１７０において熱回収された排ガスが供給される。熱回収用ガスヒータ１８０は、排ガスから更に熱回収を行う。 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.
　電気集塵装置１９０は、排気通路１５０における熱回収用ガスヒータ１８０の下流側に配置される。電気集塵装置１９０には、熱回収用ガスヒータ１８０において熱回収された排ガスが供給される。電気集塵装置１９０は、電極に電圧を印加することによって排ガス中の石炭灰（フライアッシュ）を収集（捕捉）する装置である。電気集塵装置１９０において収集（捕捉）されるフライアッシュは、フライアッシュ回収装置１９１に回収される。 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.
　誘引通風機２１０は、排気通路１５０における電気集塵装置１９０の下流側に配置される。誘引通風機２１０は、電気集塵装置１９０においてフライアッシュが除去された排ガスを、一次側から取り込んで二次側に送り出す。 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.
　脱硫装置２２０は、排気通路１５０における誘引通風機２１０の下流側に配置される。脱硫装置２２０には、誘引通風機２１０から送り出された排ガスが供給される。脱硫装置２２０は、例えば湿式石灰－石膏法により排ガス中の硫黄酸化物を除去する。湿式石灰－石膏法は、排ガスに石灰石と水との混合液を吹き付けることにより、排ガスに含有されている硫黄酸化物を混合液に吸収させて脱硫石膏スラリーを生成させ、排ガス中の硫黄酸化物を除去する方法である。この際に発生したホウ素やセレン等の微量物質が含まれる排水は、排水処理装置２２１によって処理される。 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. In the 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.
　再加熱用ガスヒータ２３０は、排気通路１５０における脱硫装置２２０の下流側に配置される。再加熱用ガスヒータ２３０には、脱硫装置２２０において硫黄酸化物が除去された排ガスが供給される。再加熱用ガスヒータ２３０は、排ガスを加熱する。熱回収用ガスヒータ１８０及び再加熱用ガスヒータ２３０は、排気通路１５０における、空気予熱器１７０と電気集塵装置１９０との間を流通する排ガスと、脱硫装置２２０と脱硫通風機２４０との間を流通する排ガスと、の間で熱交換を行うガス－ガスヒータとして構成してもよい。 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.
　脱硫通風機２４０は、排気通路１５０における再加熱用ガスヒータ２３０の下流側に配置される。脱硫通風機２４０は、再加熱用ガスヒータ２３０において加熱された排ガスを一次側から取り込んで二次側に送り出す。 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.
　煙突２５０は、排気通路１５０における脱硫通風機２４０の下流側に配置される。煙突２５０には、再加熱用ガスヒータ２３０で加熱された排ガスが導入される。煙突２５０は、排ガスを排出する。 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.
［脱硝触媒研磨装置］
　上記説明した石炭火力発電設備１００に用いられる脱硝触媒Ｃは、使用の継続に伴いシンタリング等の熱的劣化、触媒成分の被毒による化学的劣化、及び煤塵が触媒表面を被覆する物理的劣化等により、脱硝性能が低下する。脱硝性能が低下した脱硝触媒Ｃは、触媒表面である貫通孔Ｃ１の内面を研磨し、表面の付着物等を除去することで脱硝性能が回復する。
　以下、脱硝性能の低下した脱硝触媒Ｃの貫通孔Ｃ１の内面を研磨し、脱硝性能を回復させる脱硝触媒研磨装置１について説明する。 [Denitration catalyst polishing device]
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.
Hereinafter, 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.
〔第１実施形態〕
　本実施形態に係る脱硝触媒研磨装置１は、脱硝触媒Ｃの貫通孔Ｃ１に空気と共に研磨材Ａを流通させて、貫通孔Ｃ１の内面を研磨する装置である。脱硝触媒研磨装置１は、図３に示すように、混合部１０と、流入路２０と、流出路３０と、サイクロン４０と、コンプレッサ５０と、バグフィルタ６０と、吸引ファン７０と、を備える。脱硝触媒研磨装置１の被研磨対象である脱硝触媒Ｃは、流入路２０における上流側固定部材２２と、流出路３０における下流側固定部材３２との間に挟持される。脱硝触媒Ｃは、脱硝触媒Ｃの貫通孔Ｃ１の流路方向が水平面に対して略垂直になるように固定される。 [First Embodiment]
The denitration catalyst polishing device 1 according to the present embodiment 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. As shown in FIG. 3, 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.
　混合部１０は、空気と研磨材Ａとを混合し、流入路２０を介して脱硝触媒Ｃに空気と混合された研磨材Ａを供給する。混合部１０には、ブラストガン１１と、漏斗部１２と、これらを収容するキャビネット１３とが設けられる。ブラストガン１１は、エアホース５１を介してコンプレッサ５０と連結されており、圧縮空気を噴射可能である。ブラストガン１１は、複数台設けられていてもよい。ブラストガン１１には、後述する研磨材供給路３３が連結される。ブラストガン１１から圧縮空気が噴射されると、エジェクター効果が生じ、研磨材供給路３３を通じて研磨材Ａがブラストガン１１内に供給される。そして、ブラストガン１１の内部で研磨材Ａと圧縮空気とが混合され、漏斗部１２に噴射される。噴射された研磨材Ａは、空気と均一に混合された状態で、漏斗部１２を通じて流入路２０に流入する。 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. Then, 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.
　流入路２０は、脱硝触媒Ｃの上流側の流路であり、空気と混合された研磨材Ａが流入する流路である。流入路２０は、上流側流路２１及び上流側固定部材２２からなる。上流側流路２１は、屈曲部を有する流路であり、上流側が漏斗部１２と連結され、下流側が上流側固定部材２２と連結される。上流側固定部材２２は、直線状の流路を有し、下流側が脱硝触媒Ｃの下端部（上流側端部）と連結されて脱硝触媒Ｃを固定する。上流側流路２１及び上流側固定部材２２の構成は後段で詳述する。 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.
　流出路３０は、脱硝触媒Ｃの下流側の流路である。流出路３０は、研磨材Ａと、脱硝触媒Ｃの表面が研磨されることで生じた被研磨物とが流通する流路である。研磨材Ａと被研磨物とは、吸引部としての吸引ファン７０により空気と共に吸引される。流出路３０の途中にはサイクロン４０が設けられ、研磨材Ａと被研磨物とが分離される。
　流出路３０は、脱硝触媒Ｃの上端部（下流側端部）と連結されて脱硝触媒Ｃを固定する下流側固定部材３２と、下流側固定部材３２とサイクロン４０とを連結する下流側流路３１と、サイクロン４０と混合部１０とを連結する研磨材供給路３３と、を有する。 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.
　サイクロン４０は、公知のサイクロン分級器であり、混合部１０よりも高い位置に配置される。サイクロン４０の上流端は、下流側流路３１と連結される。サイクロン４０の下部には研磨材供給路３３が連結され、サイクロン４０により分離された研磨材Ａは、研磨材供給路３３を通じて重力により落下して混合部１０に供給される。サイクロン４０の下流端は、搬送パイプ４１と連結され、搬送パイプ４１の下流端は、バグフィルタ６０と連結される。サイクロン４０により分離された被研磨物は、空気と共に搬送パイプ４１を通じてバグフィルタ６０に流入する。 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.
　バグフィルタ６０は、公知の集塵装置である。バグフィルタ６０は、脱硝触媒Ｃの被研磨物を含む空気中の粉塵を捕集する。捕集された粉塵は、バグフィルタ６０の下部に設けられた図示しない貯蔵部に貯蔵され、所望のタイミングで回収される。バグフィルタ６０の下流端は、連結パイプ６１と連結される。連結パイプ６１の下流端は、吸引部としての吸引ファン７０に連結される。バグフィルタ６０を通過して粉塵が除去された清浄な空気は、吸引ファン７０によって吸引されて、排気ダクト７１により大気中に排出される。 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.
　次に、本実施形態に係る脱硝触媒研磨装置１の、上流側流路２１及び上流側固定部材２２の構成の詳細について、図面を参照して以下説明する。図４は、脱硝触媒研磨装置１の流入路２０付近を示す縦断面図であり、図５は、同様に流入路２０付近を示す分解斜視図である。 Next, the details of the configuration of the upstream side flow path 21 and the upstream side fixing member 22 of the denitration catalyst polishing device 1 according to the present embodiment will be described below with reference to the drawings. FIG. 4 is a vertical cross-sectional view showing the vicinity of the inflow path 20 of the denitration catalyst polishing device 1, and FIG. 5 is an exploded perspective view showing the vicinity of the inflow path 20 in the same manner.
　本実施形態に係る流入路２０は、図４及び図５に示すように、屈曲部２１ａを有する上流側流路２１を有する。そして、混合部１０で空気と混合された研磨材Ａを、屈曲部２１ａを有する上流側流路２１を通じて脱硝触媒Ｃの下方から流通させる。上記構成により、混合部１０と脱硝触媒Ｃとを並置できる。一方で、上流側流路２１が屈曲部２１ａを有することで、脱硝触媒Ｃに流入する研磨材Ａの分布に偏りが生じやすくなる。しかし、研磨材Ａを分散させるために長い流路を設けることは好ましくない。
　本実施形態に係る流入路２０は、上流側固定部材２２に以下説明する緩衝部材及び規制部材を設けることにより、屈曲部２１ａの後段の流路をコンパクトに構成でき、かつ十分な研磨材Ａの分散効果が得られるものである。 As shown in FIGS. 4 and 5, the inflow path 20 according to the present embodiment 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.
In the inflow path 20 according to the present embodiment, by providing 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.
　上流側固定部材２２は、脱硝触媒Ｃの下端部（上流側端部）を固定し、内部に空気と混合された研磨材Ａが流通する直線状の流路を有する。図４及び図５に示すように、上流側固定部材２２の流路方向は、脱硝触媒Ｃの貫通孔の流路方向と同一方向である。即ち、上流側固定部材２２の流路方向は、水平面に対して略垂直方向である。上流側固定部材２２の流路内には、上方から順に緩衝部材２２ａと、第１規制部材２２ｂと、第２規制部材２２ｃと、が設けられる。 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.
　緩衝部材２２ａは、空気と混合された研磨材Ａの流速を低下させる部材であり、また、研磨材Ａを分散させる効果を有する。緩衝部材２２ａは、２枚のメッシュ部材２２ａ１及び２２ａ２からなる。緩衝部材２２ａにより研磨材Ａの流速が低下されることで、脱硝触媒Ｃの上流側端部の破損を抑制できる。図４に示すように、脱硝触媒Ｃの上流側端部に当接する端面保護材Ｐを更に設けてもよい。端面保護材Ｐは、例えば脱硝触媒Ｃの貫通孔Ｃ１の形状に対応するメッシュ部材からなる。このような端面保護材Ｐを設けることで、脱硝触媒Ｃの上流側端部の破損をより抑制できる。 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. As shown in FIG. 4, 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.
　メッシュ部材２２ａ１及び２２ａ２は、任意の開口率、メッシュ数、及び目開きを有する。開口率が大きすぎるとメッシュ部材が破損しやすくなり、小さすぎると上流側固定部材２２の圧損が大きくなる。上記開口率は、例えば、脱硝触媒Ｃの開口率と同程度とすることができる。また、メッシュ部材２２ａ１及び２２ａ２のメッシュ数及び目開きについても、脱硝触媒Ｃと同程度とすることができる。
　２枚のメッシュ部材２２ａ１及び２２ａ２の開口部は、上流側固定部材２２の流路方向に対して互いにずれた位置になるように配置されることが好ましい。例えば、メッシュ部材２２ａ１のメッシュ数と、メッシュ部材２２ａ２のメッシュ数を異なるメッシュ数とすることで、開口部がずれた位置となるように、メッシュ部材２２ａ１及び２２ａ２を配置できる。例えば、メッシュ部材２２ａ１の流路横断面におけるメッシュ数を２１×２１とし、メッシュ部材２２ａ２の流路横断面におけるメッシュ数を、脱硝触媒Ｃの貫通孔Ｃ１の数と等しい２０×２０とすることができる。上記以外に、メッシュ部材２２ａ１及び２２ａ２のメッシュ数を同数とし、開口部がずれるように配置してもよい。 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. For example, by setting the number of meshes of the mesh member 22a1 and the number of meshes of the mesh member 22a2 to different numbers of meshes, the mesh members 22a1 and 22a2 can be arranged so that the openings are displaced. For example, the number of meshes in the cross section of the flow path of the mesh member 22a1 may be 21 × 21, and 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. In addition to the above, 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.
　第１規制部材２２ｂは、上流側固定部材２２の流路横断面における中央部に配置される、略直方体形状を有する部材である。第１規制部材２２ｂの両端部は、上流側固定部材２２の流路内面に当接して固定される。本実施形態において、第１規制部材２２ｂの長手方向は、図４及び図５において白抜き矢印で示す上流側流路２１の流入方向に対して直交するように配置される。また、第１規制部材２２ｂの下面は、上流側固定部材２２の流路方向に対して略垂直になるように配置される。 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. In the present embodiment, 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.
　第２規制部材２２ｃは、上流側固定部材２２の流路横断面における両端部に配置され、略直方体形状を有する２つの第２規制部材２２ｃ１及び２２ｃ２からなる。第２規制部材２２ｃ１及び２２ｃ２の両端部は、上流側固定部材２２の流路内面に当接して固定される。本実施形態において、第２規制部材２２ｃ１及び２２ｃ２の長手方向は、図４及び図５において白抜き矢印で示す、上流側流路２１の流入方向に対して直交するように配置される。また、第２規制部材２２ｃ１は、上流側流路２１の屈曲部２１ａの外側方向に配置される外側規制部であり、第２規制部材２２ｃ２は、上流側流路２１の屈曲部２１ａの内側方向に配置される内側規制部である。第２規制部材２２ｃ１及び２２ｃ２の下面は、上流側固定部材２２の流路方向に対して略垂直になるように配置される。第２規制部材２２ｃ１の流路横断面に占める面積、即ち下面の面積は、第２規制部材２２ｃ２の下面の面積よりも大きい。上記構成により、屈曲部２１ａの外側方向に偏りやすい研磨材Ａを好ましく分散させることができる。 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. In the present embodiment, 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. Further, 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. With the above configuration, the abrasive A, which tends to be biased toward the outside of the bent portion 21a, can be preferably dispersed.
　第１規制部材２２ｂ及び第２規制部材２２ｃは、上流側固定部材２２を流通する空気と混合された研磨材Ａの流れを規制して分散させる。第１規制部材２２ｂ及び第２規制部材２２ｃは流れを完全に遮断するものでもよいし、流れの大部分を遮断し、一部を通過させる例えばメッシュ部材のような部材であってもよい。 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.
（研磨再生方法）
　次に、脱硝触媒研磨装置１を用いて脱硝触媒Ｃを研磨再生する方法について説明する。
　脱硝触媒研磨装置１の被研磨対象である、脱硝性能が低下した脱硝触媒Ｃを、石炭火力発電設備１００の脱硝装置１６０から取り外す。この際、脱硝触媒Ｃの貫通孔Ｃ１は、石炭灰等で閉塞されている場合があるため、適宜エアブローや水洗等により閉塞物を取り除く。次に、上流側固定部材２２と、下流側固定部材３２との間に脱硝触媒Ｃを挟持し、脱硝触媒Ｃを固定する。この際、例えば脱硝触媒Ｃの、脱硝装置１６０における排ガスの入口側端部であった付着物の多い側を、研磨材Ａの流速の高い下流側となるように配置して固定してもよい。 (Abrasion regeneration method)
Next, a method of polishing and regenerating the denitration catalyst C using the denitration catalyst polishing apparatus 1 will be described.
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. At this time, since 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. Next, the denitration catalyst C is sandwiched between the upstream fixing member 22 and the downstream fixing member 32 to fix the denitration catalyst C. At this time, for example, 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. ..
　脱硝触媒研磨装置１の作動を開始すると、吸引ファン７０及びコンプレッサ５０が作動を開始し、混合部１０で空気と混合された研磨材Ａが上流側に吸引される。研磨材Ａは、上流側流路２１及び上流側固定部材２２を介して脱硝触媒Ｃの貫通孔Ｃ１に流入し、貫通孔Ｃ１の内面の研磨を行った後、下流側固定部材３２から流出する。流出した研磨材Ａと被研磨物とは、空気と共に吸引ファン７０により吸引されて、下流側流路３１を介してサイクロン４０に流入する。サイクロン４０では、研磨材Ａと被研磨物とが分離され、研磨材Ａは研磨材供給路３３を介して混合部１０に供給される。即ち、研磨材Ａは脱硝触媒研磨装置１内を循環する。サイクロン４０で分離された被研磨物は吸引ファン７０により吸引されて、搬送パイプ４１を介してバグフィルタ６０に流入して捕集される。被研磨物が捕集された後の空気は排気ダクト７１を通じて外部に排出される。所定時間、脱硝触媒研磨装置１の作動を継続させ、脱硝触媒Ｃの貫通孔Ｃ１の内面を研磨し、貫通孔Ｃ１の内面に付着した付着物等を取り除くことで脱硝触媒Ｃを再生する。 When the operation of the denitration catalyst polishing device 1 is started, 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. In the cyclone 40, 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.
　以上説明した第１実施形態に係る脱硝触媒研磨装置１によれば、以下の効果が奏される。
　脱硝触媒研磨装置１を、脱硝触媒Ｃの上流側に配置され、研磨材Ａと空気とを混合する混合部１０と、混合部１０と脱硝触媒Ｃとを連結し、空気と混合された研磨材Ａが流通する流入路２０と、脱硝触媒Ｃの下流側に配置され、空気と共に研磨材Ａと被研磨物とを吸引する吸引ファン７０と、を有し、流入路２０は、緩衝部材２２ａと、緩衝部材２２ａの上流側、かつ流入路２０の流路横断面における中央部に配置される第１規制部材２２ｂと、第１規制部材２２ｂの上流側、かつ流入路２０の流路横断面における両端部に配置される第２規制部材２２ｃと、を有するものとして構成した。これにより、緩衝部材２２ａにより空気と混合された研磨材Ａの流速を低下させることができる。また、第１規制部材２２ｂ及び第２規制部材２２ｃにより空気と混合された研磨材Ａを分散させることができるため、脱硝触媒Ｃを均一に研磨できる。 According to the denitration catalyst polishing apparatus 1 according to the first embodiment described above, the following effects are exhibited.
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. , 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.
　流入路２０を、脱硝触媒Ｃの上流側に配置され、流路方向が脱硝触媒Ｃの貫通孔の流路方向と同一である上流側固定部材２２と、上流側固定部材２２の上流側に配置され、屈曲部２１ａを有する上流側流路２１を有し、緩衝部材２２ａと、第１規制部材２２ｂと、第２規制部材２２ｃとを、上流側固定部材２２の流路内に設けた。これにより、流入路２０が屈曲部を有する場合であっても、研磨材Ａを分散させて脱硝触媒Ｃを均一に研磨できる。 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. As a result, even when the inflow path 20 has a bent portion, the abrasive A can be dispersed and the denitration catalyst C can be uniformly polished.
　第１規制部材２２ｂ及び第２規制部材２２ｃを、長手方向が上流側流路２１の流入方向に対して直交するように配置した。これにより、上流側流路２１が屈曲部２１ａを有する場合において、研磨材Ａを分散させる効果が好ましく得られる。 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.
　外側規制部２２ｃ１の流路横断面に占める面積は、内側規制部２２ｃ２の流路横断面に占める面積よりも大きいものとした。これにより、上流側流路２１が屈曲部２１ａを有する場合において、研磨材Ａを分散させる効果がより好ましく得られる。 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. As a result, when the upstream flow path 21 has the bent portion 21a, the effect of dispersing the abrasive A can be more preferably obtained.
　緩衝部材２２ａを、２つのメッシュ部材２２ａ１及び２２ａ２として構成し、メッシュ部材２２ａ１及び２２ａ２の開口部は、流路方向に対して互いにずれた位置に配置されるものとした。これにより、２つのメッシュ部材２２ａ１及び２２ａ２のいずれかに研磨材Ａが衝突し、流速が低下すると共に分散される可能性が高くなるため、研磨材Ａの流速を低下させ、かつ研磨材Ａを分散させる効果が好ましく得られる。 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. As a result, 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.
〔第２実施形態〕
　第２実施形態に係る脱硝触媒研磨装置１Ａについて、図面を参照して説明する。以下、第１実施形態と同様の構成については、説明を省略する場合がある。
　図６は、本実施形態に係る脱硝触媒研磨装置１Ａの流入路２０の構成を示す分解斜視図である。本実施形態の流入路２０以外の構成は第１実施形態と同様である。 [Second Embodiment]
The denitration catalyst polishing apparatus 1A according to the second embodiment will be described with reference to the drawings. Hereinafter, the description of the same configuration as that of the first embodiment may be omitted.
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.
　流入路２０は、図６に示すように、第１実施形態と同様、上流側流路２１と、上流側固定部材２２と、からなる。上流側流路２１は、屈曲部２１ａを有する。上流側固定部材２２は、緩衝部材２２ａと、第１規制部材２２ｂと、第２規制部材２２ｃと、を有する。緩衝部材２２ａは、第１実施形態と同様、２つのメッシュ部材２２ａ１及び２２ａ２からなる。 As shown in FIG. 6, 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.
　第１規制部材２２ｂは、第１実施形態と同様、流路横断面における中央部に配置される略直方体形状を有する部材である。第１規制部材２２ｂの下面は、上流側固定部材２２の流路方向に対して略垂直になるように配置される。 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.
　第２規制部材２２ｃは、第２規制部材２２ｃ３及び２２ｃ４からなり、第１実施形態と同様、流路横断面における両端部に配置される略直方体形状を有する部材である。第２規制部材２２ｃ１及び２２ｃ２の下面は、上流側固定部材２２の流路方向に対して略垂直になるように配置される。 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.
　第１規制部材２２ｂ及び第２規制部材２２ｃの長手方向は、本実施形態において、図６において白抜き矢印で示す、上流側流路２１の流入方向に対して平行になるように配置される。また、第２規制部材２２ｃ３及び第２規制部材２２ｃ４の流路横断面に占める面積は、略同一である。 In the present embodiment, 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.
　上記第２実施形態に係る第１規制部材２２ｂ及び第２規制部材２２ｃによっても、空気と混合された研磨材Ａを分散させる効果が好ましく得られる。 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.
〔他の実施形態〕
　本実施形態に係る脱硝触媒研磨装置１Ｂについて、図面を参照して説明する。以下、第１実施形態及び第２実施形態と同様の構成については、説明を省略する場合がある。
　図７は、本実施形態に係る脱硝触媒研磨装置１Ｂに固定された脱硝触媒Ｃと、上流側固定部材２２及び下流側固定部材３２付近の構成を示す斜視図である。 [Other Embodiments]
The denitration catalyst polishing apparatus 1B according to the present embodiment will be described with reference to the drawings. Hereinafter, the description of the same configurations as those of the first embodiment and the second embodiment may be omitted.
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.
　本実施形態に係る脱硝触媒研磨装置１Ｂは、図７に示すように、回転機構Ｒ１及びＲ２を有する。回転機構Ｒ１及びＲ２は、脱硝触媒Ｃの貫通孔Ｃ１の流路方向を軸として、脱硝触媒Ｃを回転可能に支持する。上述のように、流入路２０における上流側流路２１が屈曲部２１ａを有する場合、流入路２０から脱硝触媒Ｃに流入する研磨材Ａの分布に偏りが生じる場合がある。本実施形態に係る脱硝触媒研磨装置１Ｂは、回転機構Ｒ１及びＲ２により、脱硝触媒Ｃの研磨中に脱硝触媒Ｃが回転される。これにより、流入路２０の形状に起因して、脱硝触媒Ｃに流入する研磨材Ａの分布に偏りが生じる場合であっても、脱硝触媒Ｃの貫通孔の内面を均一に研磨できる。 As shown in FIG. 7, the denitration catalyst polishing device 1B according to the present embodiment 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. As described above, when the upstream side flow path 21 in the inflow path 20 has the bent portion 21a, the distribution of the abrasive A flowing into the denitration catalyst C from the inflow path 20 may be biased. In the denitration catalyst polishing device 1B according to the present embodiment, the denitration catalyst C is rotated by the rotation mechanisms R1 and R2 while the denitration catalyst C is being polished. As a result, 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.
　回転機構Ｒ１及びＲ２は、例えばモーター等の駆動部を有し、脱硝触媒Ｃを回転できる。脱硝触媒Ｃの回転数は、特に制限されないが、例えば、脱硝触媒Ｃの研磨に要する時間をＴとする場合、時間Ｔにおける回転角度を３６０度×ｎとすることが好ましい。但し、上記時間Ｔにおける回転角度が十分に大きい場合はこの限りではない。また、回転機構Ｒ１及びＲ２は、脱硝触媒Ｃを常時回転させるものであってもよいし、一定時間が経過する毎に、脱硝触媒Ｃを所定の角度回転させるものであってもよい。例えば、時間Ｔにおける脱硝触媒Ｃの回転角度を３６０度とし、時間１／４Ｔが経過する毎に９０度回転させるように、回転機構Ｒ１及びＲ２を構成することができる。 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. For example, when the time required for polishing the denitration catalyst C is T, the rotation angle at the time T is preferably 360 degrees × n. However, this does not apply when the rotation angle at the time T is sufficiently large. Further, 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. For example, 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.
　回転機構Ｒ１は、図７に示すように、上流側固定部材２２と、脱硝触媒Ｃとの間に配置される。同様に、回転機構Ｒ２は、下流側固定部材３２と、脱硝触媒Ｃとの間に配置される。回転機構Ｒ１及びＲ２の構造は、脱硝触媒Ｃを回転可能に支持できるものであれば特に制限されない。 As shown in FIG. 7, the rotation mechanism R1 is arranged between the upstream fixing member 22 and the denitration catalyst C. Similarly, 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.
　本発明は、上記実施形態に制限されるものではなく、適宜変更が可能である。 The present invention is not limited to the above embodiment, and can be appropriately modified.
　第１実施形態に係る緩衝部材２２ａを、２つのメッシュ部材２２ａ１及び２２ａ２からなるものとして説明したが、この構成に限定されない。緩衝部材２２ａは、３つ以上のメッシュ部材により構成してもよい。その場合、少なくとも一組のメッシュ部材の開口部が、流路方向に対して互いにずれた位置に配置されることが好ましい。 Although 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.
　上記実施形態に係る第１規制部材２２ｂ及び第２規制部材２２ｃを、略直方体形状を有し、下面が上流側固定部材２２の流路方向に対して略垂直になるように配置されるものとして説明したが、この構成に限定されない。第１規制部材２２ｂ及び第２規制部材２２ｃは、直方体以外の形状を有していてもよい。また、下面が下流側固定部材２２の流路方向に対して垂直ではなく、傾斜したものであってもよい。また、第１規制部材２２ｂ及び第２規制部材２２ｃの流路方向に対する角度を、変更可能に構成してもよい。 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. As described above, 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.
　上記他の実施形態に係る回転機構Ｒ１及びＲ２を、第１実施形態や第２実施形態に係る上流側固定部材２２の構成と組み合わせてもよい。これにより、脱硝触媒Ｃをより均一に研磨できる。 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.
１　　　　脱硝触媒研磨装置
１０　　　混合部
２０　　　流入路
２１　　　上流側流路
２２　　　上流側固定部材
２２ａ　　緩衝部材
２２ａ１　メッシュ部材
２２ａ２　メッシュ部材
２２ｂ　　第１規制部材
２２ｃ　　第２規制部材
７０　　　吸引ファン（吸引部）
Ｃ　　　　脱硝触媒
Ｃ１　　　貫通孔 1 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

Claims (6)

  1. 　長手方向に延びる複数の貫通孔が設けられた脱硝触媒の前記貫通孔に、空気と共に研磨材を流通させて、前記貫通孔の内面を研磨する脱硝触媒研磨装置であって、
    　前記脱硝触媒の上流側に配置され、研磨材と空気とを混合する混合部と、
    　前記混合部と前記脱硝触媒との間に配置され、空気と混合された研磨材が流通する流入路と、
    　前記脱硝触媒の下流側に配置され、空気と共に研磨材と被研磨物とを吸引する吸引部と、を有し、
    　前記流入路は、空気と混合された研磨材の流速を低下させる緩衝部材と、
    　前記緩衝部材の上流側、かつ前記流入路の流路横断面における中央部に配置される第１規制部材と、
    　前記第１規制部材の上流側、かつ前記流入路の流路横断面における両端部に配置される第２規制部材と、を有する脱硝触媒研磨装置。     A denitration catalyst polishing device 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 portion, which is arranged on the upstream side of the denitration catalyst and mixes the abrasive and air,
    An inflow path arranged between the mixing portion and the denitration catalyst and through which an abrasive mixed with air flows,
    It has a suction part which is arranged on the downstream side of the denitration catalyst and sucks the abrasive material and the object to be polished together with air.
    The inflow path includes a cushioning member that reduces the flow velocity of the abrasive mixed with air, and
    A first regulating member arranged on the upstream side of the cushioning member and at the center of the flow path cross section of the inflow path.
    A denitration catalyst polishing device having second regulating members arranged on the upstream side of the first regulating member and at both ends in a cross section of the flow path of the inflow path.
  2. 　前記流入路は、前記脱硝触媒を固定する上流側固定部材と、前記上流側固定部材の上流側に配置され、屈曲部を有する上流側流路と、を有し、
    　前記上流側固定部材の流路方向は、前記貫通孔の流路方向と同一方向であり、
    　前記緩衝部材、前記第１規制部材、及び前記第２規制部材は、前記上流側固定部材の流路内に配置される、請求項１に記載の脱硝触媒研磨装置。     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.
    The flow path direction of the upstream fixing member is the same as the flow path direction of the through hole.
    The denitration catalyst polishing apparatus according to claim 1, wherein the cushioning member, the first regulating member, and the second regulating member are arranged in a flow path of the upstream fixing member.
  3. 　前記第１規制部材及び前記第２規制部材は、略直方体形状を有し、前記上流側流路の流入方向に対し、長手方向が直交するように配置される、請求項２に記載の脱硝触媒研磨装置。 The denitration catalyst according to claim 2, wherein the first regulating member and the second regulating member have a substantially rectangular parallelepiped shape and are arranged so that the longitudinal direction is orthogonal to the inflow direction of the upstream flow path. Polishing equipment.
  4. 　前記第２規制部材は、前記屈曲部の外側方向に配置される外側規制部と、前記屈曲部の内側方向に配置される内側規制部と、からなり、
    　前記外側規制部の流路横断面に占める面積は、前記内側規制部の流路横断面に占める面積よりも大きい、請求項３に記載の脱硝触媒研磨装置。     The second regulating member includes 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.
    The denitration catalyst polishing apparatus according to claim 3, wherein the area occupied in the cross section of the flow path of the outer regulation section is larger than the area occupied in the cross section of the flow path of the inner regulation section.
  5. 　前記第１規制部材及び前記第２規制部材は、略直方体形状を有し、前記上流側流路の流入方向に対し、長手方向が平行になるように配置される、請求項２に記載の脱硝触媒研磨装置。 The denitration according to claim 2, wherein the first regulating member and the second regulating member have a substantially rectangular parallelepiped shape and are arranged so that the longitudinal direction is parallel to the inflow direction of the upstream flow path. Catalytic polishing equipment.
  6. 　前記緩衝部材は、２つ以上のメッシュ部材からなり、少なくとも１組の前記メッシュ部材の開口部は、流路方向に対して互いにずれた位置に配置される、請求項１～５いずれかに記載の脱硝触媒研磨装置。 7. Denitration catalyst polishing equipment.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62289292A (en) * 1986-06-09 1987-12-16 Nippon Koden Kk Mixing and screening tank for neutralization treatment device
JP2008207063A (en) * 2007-02-23 2008-09-11 Fujio Hori Granular material-mixed gas producing apparatus
WO2014155628A1 (en) * 2013-03-28 2014-10-02 中国電力株式会社 Method for regenerating denitrification catalyst
WO2018025890A1 (en) * 2016-08-05 2018-02-08 サンスター技研株式会社 Apparatus and method for mixing paste material and gas
WO2018211549A1 (en) * 2017-05-15 2018-11-22 中国電力株式会社 Grinding device for denitrification catalysts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62289292A (en) * 1986-06-09 1987-12-16 Nippon Koden Kk Mixing and screening tank for neutralization treatment device
JP2008207063A (en) * 2007-02-23 2008-09-11 Fujio Hori Granular material-mixed gas producing apparatus
WO2014155628A1 (en) * 2013-03-28 2014-10-02 中国電力株式会社 Method for regenerating denitrification catalyst
WO2018025890A1 (en) * 2016-08-05 2018-02-08 サンスター技研株式会社 Apparatus and method for mixing paste material and gas
WO2018211549A1 (en) * 2017-05-15 2018-11-22 中国電力株式会社 Grinding device for denitrification catalysts

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