WO2021245842A1 - 脱硝触媒研磨装置 - Google Patents

脱硝触媒研磨装置 Download PDF

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Publication number
WO2021245842A1
WO2021245842A1 PCT/JP2020/021946 JP2020021946W WO2021245842A1 WO 2021245842 A1 WO2021245842 A1 WO 2021245842A1 JP 2020021946 W JP2020021946 W JP 2020021946W WO 2021245842 A1 WO2021245842 A1 WO 2021245842A1
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Prior art keywords
denitration catalyst
air
abrasive material
abrasive
hole
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PCT/JP2020/021946
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English (en)
French (fr)
Japanese (ja)
Inventor
敏和 吉河
和広 吉田
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 JP2020549829A priority Critical patent/JPWO2021245842A1/ja
Priority to PCT/JP2020/021946 priority patent/WO2021245842A1/ja
Publication of WO2021245842A1 publication Critical patent/WO2021245842A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general

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 whose performance has deteriorated. 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 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 polishing the denitration catalyst without causing a bias in the distribution of the abrasive material flowing into the denitration catalyst.
  • the present invention is a denitration catalyst polishing apparatus for polishing the inner surface of the through hole by allowing an abrasive material to flow together with air through the through hole of the denitration catalyst provided with a plurality of through holes extending in the longitudinal direction.
  • the denitration catalyst is placed so that the flow path direction of the through hole is substantially perpendicular to the horizontal plane, and the abrasive flows from the lower side to the upper side of the through hole and below the denitration catalyst.
  • a suction unit that is arranged and sucks the abrasive together with air, an inflow path that is arranged above the denitration catalyst and has a flow path extending in the vertical direction, and an inflow path that is arranged on the upstream side of the inflow path, and is arranged above the air and the abrasive. It has a mixing section for mixing the material, and the mixing section has an abrasive supply path to which the abrasive material is supplied and an air hole into which air flows in, and the air flowing in from the air hole is a mixture.
  • the present invention relates to a denitration catalyst polishing apparatus that swirls in the mixing portion and is mixed with the abrasive.
  • the parts other than the abrasive supply path, the opening leading to the inflow path, and the air hole in the mixing portion are sealed from the outside.
  • the mixing portion has a cylindrical shape, and a plurality of the air holes are provided on the circumferential side surfaces of the mixing portion at substantially equal intervals, and the air flowing in from the air holes is the air in the mixing portion. It is preferable that the air flows along the inner surface of the circumference.
  • the abrasive supply path is composed of two or more of the abrasive material supply paths to which different types of the abrasive material are supplied.
  • the present invention can provide a denitration catalyst polishing apparatus capable of uniformly polishing the denitration catalyst without causing a bias in the distribution of the abrasive material flowing into the denitration catalyst.
  • the denitration catalyst to be polished of 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 whose performance has deteriorated.
  • the coal-fired power generation facility 100 includes a coal bunker 112, a coal feeder 115, a pulverized coal machine 120, a pulverized coal supply pipe 130, a combustion boiler 140, and a combustion boiler 140 on the downstream side.
  • An exhaust passage 150 provided, a denitration device 160 provided in the exhaust passage 150, an air preheater 170, a heat recovery gas heater 180, an electrostatic dust collector 190, an attract ventilator 210, a wet desulfurization device 220, and a reheating gas heater 230.
  • a desulfurization ventilator 240, and a chimney 250 are examples of the air preheater 170, a heat recovery gas heater 180, an electrostatic dust collector 190, an attract ventilator 210, a wet desulfurization device 220, and a reheating gas heater 230.
  • the coal bunker 112 stores coal supplied by a coal carrier from a coal silo (not shown).
  • the coal feeder 115 supplies the coal supplied from the coal bunker 112 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 130 together with the forcedly 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 is distributed to the exhaust passage 150 side together with exhaust gas.
  • 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 indentation 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 exhaust gas recovered by the air preheater 170 is supplied to the heat recovery gas heater 180.
  • 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 out 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 device 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 apparatus 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.
  • 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 the catalyst component, 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 a 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 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 abrasive material A flows from the lower side to the upper side of the through hole C1 of the denitration catalyst C.
  • the mixing unit 10 has, for example, a cylindrical shape, and internally mixes the abrasive material A1 and the abrasive material A2 supplied from the abrasive material supply paths 33a and 33b, which will be described later, with air and supplies the abrasive material A2 to the inflow path 20.
  • the abrasive material A is composed of different types of abrasive material A1 and abrasive material A2, but in the present specification, these may be collectively referred to as abrasive material A.
  • the mixing unit 10 has a side surface 11, a bottom surface 13, and an upper surface 14.
  • the side surface 11 is continuous with the bottom surface 13 and the top surface 14 of the mixing portion 10, and is composed of a circumferential surface extending in the vertical direction.
  • a plurality of air suction paths 110 provided with air holes 110a into which air flows in from the outside are provided on the side surface 11.
  • a total of eight air suction passages 110 are provided on the side surfaces 11 at substantially equal intervals.
  • the side surface 11 is connected to the abrasive supply paths 33a and 33b via openings 111a and 111b, respectively.
  • the bottom surface 13 is a circular flat surface, and the abrasive materials A1 and A2 that have flowed in from the abrasive material supply paths 33a and 33b are deposited.
  • the upper surface 14 is a circular flat surface similar to the bottom surface 13, and is connected to the suction path 21 described later via the opening 21a.
  • the opening 21a is arranged substantially in the center of the upper surface 14.
  • the mixing portion 10 is sealed from the outside except for the air holes 110a, the openings 111a and 111b leading to the abrasive supply passages 33a and 33b, and the openings 21a leading to the suction passage 21.
  • the mixing unit 10 preferably has a circular inner peripheral surface in a plan view. As a result, the air flowing in from the air hole 110a can be preferably swirled.
  • the air suction path 110 is, for example, a square cylindrical member having a flow path through which air flows. One end of the flow path of the air suction path 110 is open to the outside as an air hole 110a. The other end of the flow path of the air suction path 110 communicates with the inside of the mixing section 10.
  • the shape of the air suction passage 110 is not limited to the square cylinder shape, and may be any shape having a flow path inside, such as a cylindrical shape.
  • one side surface of the air suction path 110 is arranged along the tangential direction of the circular inner peripheral surface of the mixing portion 10 in a plan view.
  • the other side surface of the air suction path 110 is arranged parallel to the one side surface in a plan view and on the inner peripheral side of the circular inner peripheral surface of the mixing portion 10.
  • the air flowing into the mixing portion 10 from the air hole 110a flows in from the tangential direction of the circular inner peripheral surface of the mixing portion 10 in a plan view.
  • the air flowing into the mixing portion 10 is sucked from the opening 21a side and collides with the air flowing in from another air hole 110a ahead of the inflow direction, so that the flow direction gradually changes.
  • the abrasive material A supplied to the mixing unit 10 is composed of two different types of abrasive materials A1 and A2 in the present embodiment.
  • the abrasive materials A1 and A2 have different speeds of flowing through the inside of the through hole C1.
  • FIG. 6 is a schematic view showing a state in which the abrasives A1 and A2 flow through the through hole C1.
  • the abrasive material A composed of the abrasive material A1 and the abrasive material A2 mixed with air flows from the lower side to the upper side through the upstream fixing member 22 connected to the lower side of the denitration catalyst C through the plurality of through holes C1. Then, the inner surface of the through hole C1 is polished.
  • Abrasives A1 and A2 have different speeds of flowing through the through hole C1, for example, because the average particle size is different.
  • the abrasive A1 has a larger average particle size and a larger mass than the abrasive A2, and therefore acts on the abrasive A1 when the abrasives A1 and A2 flow together with the air through the through holes C1 from the lower side to the upper side. Since the gravity is larger than that of the abrasive A2, the distribution speed of the abrasive A1 is smaller than the distribution speed of the abrasive A2. Then, the abrasive material A2 collides with the abrasive material A1, and the abrasive material A2 scatters in the through hole C1. As a result, the proportion of the abrasive material A2 that collides with the inner surface of the through hole C1 increases, and as a result, the polishing efficiency of the denitration catalyst C is improved.
  • the abrasives A1 and A2 are supplied to the mixing unit 10 from different abrasive supply paths 33a and 33b, respectively. Thereby, the ratio of the abrasives A1 and A2 can be easily adjusted. Further, in the mixing unit 10, the air flowing in from the air holes 110a swirls and is mixed with the abrasives A1 and A2. Therefore, even when different types of abrasives A1 and A2 are used, the abrasives A1 and A2 can be uniformly mixed and flowed into the through hole C1.
  • the particle size specified in JIS R6001 is preferably F7 to F14, more preferably F8 to F12, and even more preferably F10.
  • the average particle size of the abrasive A2 is preferably F36 to F60, more preferably F40 to F54, and even more preferably F46, as defined in JIS R6001.
  • the average particle size, which is the particle size at the cumulative height of 50% of the abrasive A1 is preferably 1.65 to 2.16 mm.
  • the average particle size, which is the particle size at the cumulative height of 50% of the abrasive A2 is preferably 0.30 to 0.45 mm.
  • the ratio of the abrasive material A1 to the abrasive material A is preferably 5 to 15% by weight. If the ratio of the abrasive material A1 is too small with respect to the above range, the polishing efficiency cannot be sufficiently improved. Further, if the ratio of the polishing material A1 is too large with respect to the above range, the denitration catalyst C cannot be uniformly polished, and there will be a portion where the polishing is insufficient and a portion where the polishing is excessive. In addition, the denitration catalyst C may be damaged.
  • the material of the abrasive A is not particularly limited, but for example, diamond, CBN (cubic boron nitride), B4C (boron carbide), silicon carbide, silica, ceria, alumina, white alumina, zirconia, titania, and manganese oxide. , Barium carbonate, chromium oxide, iron oxide and the like.
  • the abrasives A1 and A2 may be abrasives made of the same material, but the abrasives A1 and A2 may be made of different materials. For example, by using the abrasives A1 and A2 having different densities, the distribution speeds of the abrasives A1 and A2 can be made different.
  • the inflow path 20 is a flow path on the upstream side of the denitration catalyst C, and is a flow path in which the abrasive A is sucked by the suction fan 70 together with air and flows into the flow path.
  • the inflow path 20 includes a suction path 21 and an upstream fixing member 22.
  • the suction passage 21 is provided with an opening 21a at the upstream end, and has a vertically extending flow path through which the abrasive A and air can flow.
  • the flow path of the suction passage 21 is a flow path that communicates the upstream fixing member 22 and the mixing portion 10.
  • the upper end portion (downstream side end portion) of the suction path 21 is connected to the upstream side fixing member 22.
  • An opening 21a is formed at the lower end portion (upstream side end portion) of the suction passage 21 and is connected to the upper surface 14 of the mixing portion 10. The abrasive A mixed with air flows into the suction passage 21 through the opening 21a.
  • the upstream fixing member 22 has a vertically extending flow path through which the abrasive A and air can flow, and the downstream side is connected to the lower end portion (upstream side end portion) of the denitration catalyst C to denitrate the catalyst C. To fix.
  • the upstream side of the upstream side fixing member 22 is connected to the suction passage 21.
  • the flow path of the upstream fixing member 22 and the flow path of the suction passage 21 are vertically continuous flow paths.
  • the abrasive material A that has flowed in from the suction path 21 together with the air flows into the through hole C1 of the denitration catalyst C via the upstream fixing member 22.
  • the suction fan 70 as the suction unit is used as the power for sucking the polishing material A. Further, the abrasive A is sucked together with air in the vertical direction from the mixing unit 10 via the suction path 21. Therefore, the abrasive A is sufficiently dispersed and flows into the upstream fixing member 22 in a state where the flow velocity is low.
  • the channel crossing area of the suction passage 21 is smaller than the channel crossing area of the upstream fixing member 22.
  • the flow velocities of the abrasive A and the air flowing through the suction passage 21 can be increased.
  • the abrasive A is easily sucked from the opening 21a of the suction path 21.
  • the flow velocity of the abrasive material A decreases due to the increase in the channel crossing area, and the abrasive material A is dispersed, which is preferable.
  • the outflow passage 30 is a flow path on the downstream side of the denitration catalyst C.
  • the outflow path 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 portion.
  • a cyclone 40 is provided in the middle of the outflow path 30, and the abrasive material A and the object to be polished are separated from each other.
  • the outflow passage 30 is a downstream side flow path that connects the downstream side 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 the downstream side fixing member 32 and the cyclone 40. It has 31 and an abrasive material supply path 33 that supplies the abrasive material A separated by the cyclone 40 to the mixing unit 10.
  • the cyclone 40 is a known cyclone classifier, and is arranged at a position higher than 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 is distributed.
  • 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 the air through the transport pipe 41.
  • the abrasive material supply path 33 is one or more flow paths whose upstream end is connected to the cyclone 40.
  • the abrasive supply path 33 is inclined or hung downward from the cyclone 40 toward the mixing portion 10.
  • the abrasive material A that has flowed into the abrasive material supply path 33 from the cyclone 40 falls due to its own weight and is supplied to the mixing unit 10. That is, the polishing material A circulates in the denitration catalyst polishing device 1.
  • the abrasive material supply path includes two abrasive material supply paths 33a and 33b.
  • the abrasive material A1 is circulated in the abrasive material supply path 33a, and the abrasive material A2 is circulated in the abrasive material supply path 33b.
  • a classifying portion such as a sieve is provided, and the abrasive material A separated by the cyclone 40 has an abrasive material A1 having a different average particle size.
  • the bug filter 60 is a known dust collector.
  • the bag filter 60 collects dust in the air containing 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 has dust removed is sucked by the suction fan 70 and discharged into the atmosphere by the exhaust duct 71.
  • the denitration catalyst C whose denitration performance has deteriorated which is the object to be polished by the denitration catalyst polishing device 1, is removed from the denitration device 160 of the coal-fired power generation facility 100.
  • the through hole C1 of the denitration catalyst C may be blocked by coal ash or the like, the blocked object is appropriately removed by air blowing, washing with water, or the like.
  • the denitration catalyst C is sandwiched between the upstream fixing member 22 and the downstream fixing member 32, and the denitration catalyst C is fixed.
  • the side of the denitration catalyst C which was the end on the inlet side of the exhaust gas in the denitration device 160, may be arranged and fixed so as to be on the downstream side where the flow velocity of the abrasive material A is high. ..
  • the suction fan 70 starts the operation, and air flows into the mixing unit 10 from the plurality of air holes 110a provided on the side surface 11 of the mixing unit 10.
  • the air flowing in from the air hole 110a swirls in the mixing unit 10 and is mixed with the abrasives A1 and A2.
  • the uniformly mixed abrasives A1 and A2 are sucked upstream together with air through the opening 21a of the suction path 21.
  • the suction passage 21 and the upstream fixing member 22 have a flow path extending in the vertical direction inside. Therefore, the abrasives A1 and A2 are sucked vertically together with air in a uniform state and flow into the through hole C1 of the denitration catalyst C.
  • the polishing material A flows out from the downstream fixing member 32 after polishing the inner surface of the through hole C1.
  • 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 via the downstream flow path 31.
  • the abrasive A and the object to be polished are separated.
  • the abrasive material A is classified into the abrasive materials A1 and A2, and flows into the mixing unit 10 via the abrasive material supply paths 33a and 33b, respectively.
  • the object to be polished separated by the cyclone 40 is sucked by the suction fan 70, flows into the bag filter 60 via 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 C is arranged so that the flow path directions of the plurality of through holes C1 extending in the longitudinal direction are substantially perpendicular to the horizontal plane, and the abrasive material A is sucked together with air by the suction fan 70. Was circulated from below to above the through hole C1.
  • the air flowing in from the air hole 110a formed in the mixing unit 10 swirls inside the mixing unit 10, and the abrasive material A flowing in from the abrasive material supply path 33 and the air are mixed.
  • the openings 111a and 111b of the abrasive supply paths 33a and 33b, the openings 21a of the suction path 21, and the portions other than the plurality of air holes 110a are sealed from the outside.
  • all the air sucked by the suction fan 70 flows in from the plurality of air holes 110a and flows out from the openings 21a, so that a sufficient flow velocity of the abrasive A can be obtained without the need for a device such as a compressor.
  • the abrasive A can be mixed with air. Therefore, the denitration catalyst C can be uniformly and sufficiently polished.
  • the mixing portion 10 has a cylindrical shape, and a plurality of air holes 110a are provided on the circumferential side surface 11 of the mixing portion 10 at substantially equal intervals.
  • the air flowing into the mixing unit 10 from the plurality of air holes 110a can be moved to the vicinity of the center of the mixing unit 10 while being preferably swirled. Therefore, the abrasive material A mixed with air can be supplied from the inflow path 20 to the through hole C1 in a state of being evenly mixed. Therefore, uniform polishing of the denitration catalyst C can be performed.
  • the abrasive material supply path 33 includes abrasive material supply paths 33a and 33b to which different types of abrasive materials A1 and A2 are supplied.
  • abrasive material supply paths 33a and 33b to which different types of abrasive materials A1 and A2 are supplied.
  • the flow speeds of the abrasives A1 and A2 in the through holes C1 are different, so that the abrasives collide with each other and the polishing efficiency in the through holes C1 is improved.
  • the air swirls inside the mixing portion and is mixed with the abrasive material A even if the abrasive material A is composed of different types of abrasive materials A1 and A2, the air and the abrasive materials A1 and A2 are uniformly formed. And can be mixed.
  • the present invention is not limited to the above embodiment, and can be appropriately modified.
  • the mixing unit 10 has been described as having a cylindrical shape. Not limited to the above.
  • the mixing unit 10 may be such that the air and the abrasive are swirled and mixed inside by the air flowing in from the air holes.
  • the abrasive material supply path 33 has been described as being composed of the abrasive material supply paths 33a and 33b to which the abrasive materials A1 and A2 are supplied. Not limited to the above.
  • the type of the abrasive A may be three or more.
  • the number of the abrasive supply paths 33 may be three or more depending on the type of the abrasive A.
  • Denitration catalyst polishing device 10 Mixing part 11 Side surface 110a Air holes 111a, 111b Opening 20 Inflow path 21a Opening 33 Abrasive material supply path 70 Suction fan (suction part) C Denitration catalyst C1 Through hole A Abrasive

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)
PCT/JP2020/021946 2020-06-03 2020-06-03 脱硝触媒研磨装置 WO2021245842A1 (ja)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012000693A (ja) * 2010-06-14 2012-01-05 Hidaka Fine-Technologies Co Ltd 研削加工装置及び研削加工方法
WO2014155628A1 (ja) * 2013-03-28 2014-10-02 中国電力株式会社 脱硝触媒の再生方法
WO2018211549A1 (ja) * 2017-05-15 2018-11-22 中国電力株式会社 脱硝触媒の研削装置
JP2019150739A (ja) * 2018-02-28 2019-09-12 中国電力株式会社 脱硝触媒の研磨時間決定方法及び脱硝触媒の再生方法
JP2019150738A (ja) * 2018-02-28 2019-09-12 中国電力株式会社 脱硝触媒研磨装置及び脱硝触媒研磨方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012000693A (ja) * 2010-06-14 2012-01-05 Hidaka Fine-Technologies Co Ltd 研削加工装置及び研削加工方法
WO2014155628A1 (ja) * 2013-03-28 2014-10-02 中国電力株式会社 脱硝触媒の再生方法
WO2018211549A1 (ja) * 2017-05-15 2018-11-22 中国電力株式会社 脱硝触媒の研削装置
JP2019150739A (ja) * 2018-02-28 2019-09-12 中国電力株式会社 脱硝触媒の研磨時間決定方法及び脱硝触媒の再生方法
JP2019150738A (ja) * 2018-02-28 2019-09-12 中国電力株式会社 脱硝触媒研磨装置及び脱硝触媒研磨方法

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