WO2014155628A1 - 脱硝触媒の再生方法 - Google Patents
脱硝触媒の再生方法 Download PDFInfo
- Publication number
- WO2014155628A1 WO2014155628A1 PCT/JP2013/059382 JP2013059382W WO2014155628A1 WO 2014155628 A1 WO2014155628 A1 WO 2014155628A1 JP 2013059382 W JP2013059382 W JP 2013059382W WO 2014155628 A1 WO2014155628 A1 WO 2014155628A1
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- WIPO (PCT)
- Prior art keywords
- ground
- denitration catalyst
- fixing member
- abrasive
- upstream
- Prior art date
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- 239000003054 catalyst Substances 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims description 18
- 230000001172 regenerating effect Effects 0.000 title claims description 14
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 238000000227 grinding Methods 0.000 claims description 39
- 239000000428 dust Substances 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000000717 retained effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 8
- 238000011069 regeneration method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
- B24C3/06—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable
- B24C3/065—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable with suction means for the abrasive and the waste material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
- B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
- B24C3/327—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes by an axially-moving flow of abrasive particles without passing a blast gun, impeller or the like along the internal surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
- B24C9/006—Treatment of used abrasive material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Definitions
- the present invention relates to a method for regenerating a denitration catalyst used in a flue gas denitration apparatus such as a thermal power plant.
- flue gas denitration equipment has been installed in boilers and various large boilers of thermal power plants using petroleum, coal, gas, etc. as fuel, and other waste incinerators.
- the denitration catalyst is built in.
- TiO 2 or the like is generally used as a carrier, V 2 O 5 or the like is used as an active component, and an oxide of tungsten or molybdenum is added as a co-catalyst component.
- VO x -WO y Composite oxides such as —TiO 2 and VO x —MoO y —TiO 2 are used.
- honeycomb type As the catalyst shape, a honeycomb type or a plate type is generally used.
- honeycomb type after manufacturing honeycomb shape with substrate, coated type coated with catalyst component, kneaded type formed by kneading catalyst component on substrate, impregnation with honeycomb shaped substrate impregnated with catalyst component There are shapes.
- the plate-like material is a metal core or ceramic coated with a catalyst component.
- a substance that deteriorates the catalyst performance adheres to or dissolves on the catalyst surface and inside, thereby reducing the catalyst performance. There is a problem of going.
- Patent Document 1 For example, a method of polishing an inner surface of an exhaust gas passage with an abrasive (see Patent Document 1), a method of scraping the surface portion of a deteriorated denitration catalyst to make a new catalytic active surface appear (see Patent Document 2), accompanied by fine particles
- Patent Document 3 A method of physically removing a deteriorated part or foreign matter and causing an active surface to appear, such as a method of removing a foreign matter by passing a gas through a through hole (see Patent Document 3), has been studied.
- JP-A-1-119343 Japanese Patent Laid-Open No. 4-197451 JP-A-7-116523
- the physical grinding method has problems that the work is complicated and the denitration catalyst itself is cracked or destroyed by the regenerating work. Moreover, there exists a problem that it cannot grind uniformly over the flow direction of a flow path.
- an object of the present invention is to provide a denitration catalyst regeneration method in which the inner wall is uniformly ground and regenerated without destroying the denitration catalyst.
- 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 downstream fixing member having a predetermined cross-sectional flow path is connected to the other end portion of the member to be ground from a connecting side end with the member to be ground, and on the upstream side of the upstream fixing member.
- the mixing portion for mixing the abrasive and the gas is connected by a connecting member having a flow path having a smaller cross-sectional area than the expanding portion, and a predetermined opening is formed on the side of the member to be ground inside the expanding portion.
- a screen member is disposed, and on the other hand, on the downstream side of the connecting member of the downstream fixing member, classification is performed to separate the abrasive that has passed through the through-hole of the member to be ground and the workpiece to be ground by the abrasive.
- the present invention relates to a method for regenerating a denitration catalyst characterized by collecting dust at a dust collecting portion.
- the mixture of the abrasive and the gas is temporarily retained at a reduced flow rate in the expanded portion of the upstream fixing member on the upstream side of the denitration catalyst, and passes through the screen member. At that time, it is decelerated and dispersed, and it is sent into the through hole of the denitration catalyst by the suction force through the downstream fixing member having a predetermined cross-sectional flow path on the downstream side, so the end face of the denitration catalyst is destroyed.
- the grinding material can be fed uniformly and stably at the same flow rate to all the through-holes arranged from the center to the peripheral edge without grinding, and the inner wall in the through-hole can be evenly ground. Become.
- a regulating member that regulates the flow in the central portion of the flow path is disposed on the classification portion side of the downstream fixing member. And a method for regenerating a denitration catalyst.
- the flow velocity of the central portion in the radial direction in the downstream fixing member is reduced by the regulating member, it is more uniform and identical to all the through holes arranged from the central portion to the peripheral portion of the denitration catalyst.
- the abrasive can be fed stably at a flow rate, and the inner wall in the through hole can be evenly ground.
- the denitration catalyst regeneration method according to the first or second aspect, wherein the member to be ground has a dummy cell disposed on the outer periphery of the denitration catalyst. Is in the playback method.
- the member to be ground is held in an upright state so that the lower end portion of the member to be ground is held.
- the denitration catalyst regeneration method includes fixing with the upstream fixing member and fixing an upper end portion with the downstream fixing member.
- the end face of the denitration catalyst is not destroyed and all the through holes arranged from the central part to the peripheral part are uniformly and at the same flow rate.
- the abrasive can be fed, the inner wall in the through hole can be uniformly ground, and the uniform regeneration can be achieved.
- FIG. 3 is a graph showing test results of Example 1.
- 6 is a graph showing the test results of Example 2.
- 6 is a graph showing test results of Comparative Example 1.
- 10 is a graph showing test results of Comparative Example 2.
- 10 is a graph showing test results of Example 3.
- FIG. 1 shows a schematic configuration of a grinding apparatus used in the present embodiment
- a denitration catalyst 1 used in a flue gas denitration device or the like which is a member to be ground, is fixed in a state of being erected between an upstream fixing member 10 and a downstream fixing member 20,
- a mixing unit 40 is connected to the fixing member 10 via an upstream connecting member 30, and a compressor 50 is connected to the mixing unit 40.
- a classifying unit 70 is connected to the downstream fixing member 20 via a downstream connecting member 60, and a dust collecting unit 80 is connected to the classifying unit 70.
- the upstream fixing member 10 includes a fixing portion 11 that fixes the lower end portion of the denitration catalyst 1.
- the fixed portion 11 has a cross-sectional area equivalent to that of the denitration catalyst 1, and includes a widened portion 12 having a wide cross-sectional area continuously on the upstream side of the fixed portion 11, and upstream of the widened portion 12.
- the side has a tapered portion 13 whose sectional area gradually decreases, and further includes a connecting portion 14 that is continuous with the tapered portion 13 and has a sectional area equivalent to the sectional area on the smaller side of the tapered portion 13.
- One end of the upstream connecting member 30 is connected to the connecting portion 14, and the discharge port of the mixing unit 40 is connected to the other end of the upstream connecting member 30.
- the cross-sectional shape of each flow path of the upstream fixing member 10 may be rectangular or circular, and may differ depending on the part.
- a screen member 15 having a predetermined opening is disposed inside the upstream fixing member 10.
- the screen member 15 is made of a mesh having a predetermined opening, and is disposed on the inner side of the expanded portion 12 on the denitration catalyst 1 side so as to block the flow from the upstream connecting member 30 into the expanded portion 12. Has been.
- a rectifying plate 16 that forms a conical or square-tapered tapered portion that rectifies the flow from the expanding portion 12 to the fixing portion 11 is provided inside the expanding portion 12 on the fixed portion 11 side. Yes.
- the downstream fixing member 20 includes a fixing portion 21 that fixes the upper end portion of the denitration catalyst 1, and includes a straight pipe portion 22 that forms a flow path having a constant cross-sectional area by a predetermined dimension from the fixing portion 21, and thereafter has a cross-sectional area. And a connecting portion 24 continuing to the tapered portion 23, and a downstream connecting member 60 is connected to the connecting portion 24.
- a regulating member 25 that regulates the flow in the central portion of the flow path is provided on the classification portion 70 side of the downstream fixing member 20, specifically, in the straight pipe portion 22 of the downstream fixing member 20.
- the arrangement position of the regulating member 25 is not limited to the position in the flow direction as long as the flow path is the fastest, and may be on the tapered section 23 side or the denitration catalyst 1 side of the straight pipe section 22.
- the boundary with the straight pipe part 22 may be sufficient.
- the shape of the regulating member 25 is not particularly limited, it is preferable to have a shape similar to the cross-sectional shape of the denitration catalyst 1 because it regulates the central portion of the flow. It may be a mesh member that blocks a part but allows a part to pass.
- the mixing unit 40 has a substantially funnel-shaped space 41 in the center, and has an outside air inlet 42 for sucking outside air upward.
- the lower part of the substantially funnel-shaped space is connected to the upstream side connecting member 30 in a sealed state.
- a plurality of sandblast guns 44 for example, 4 to 10 units, for example, six units in the present embodiment are provided inside the mixing unit 40, and the injection port of the sandblast gun 44 has a substantially funnel-shaped space 41. It is directed to the slope direction of the lower part of each.
- a compressor 50 is connected to the sandblast gun 44 through an air regulator 46 and an abrasive hose 48 is connected.
- the compressed air supplied from the compressor 50 is adjusted to a desired pressure by the air regulator 46 and supplied to the sand blast gun 44, thereby causing an ejector effect and grinding from the classifying unit 70.
- the material is supplied.
- the abrasive and compressed air are uniformly mixed inside the sandblast gun 44 and injected into the mixing unit 40, and the compressed air containing the injected abrasive is sucked from the outside air inlet 42. It is mixed with the outside air and conveyed to the upstream fixing member 10 via the upstream connecting member 30.
- the classifying unit 70 is a known cyclone classifier and is disposed at a position higher than the mixing unit 40.
- the classification unit 70 is connected to the downstream fixing member 20 via the downstream connecting member 60, and is sealed with the dust collection unit 80 via the transport pipe 72 and the sandblast gun 44 via the abrasive hose 48. It is connected with.
- the air containing the abrasive and the ground dust conveyed to the classification unit 70 via the downstream connecting member 60 is separated into the abrasive and the air containing the dust by the classification unit 70.
- the separated abrasive is dropped and deposited under the classification unit 70 by its own weight, and is supplied again to the sandblast gun 44 through the abrasive hose 48.
- the classification portion 70 side of the abrasive hose 48 is at a higher position than the sand blast gun 44 side of the abrasive hose 48, the pressure of the compressed air from the compressor 50 is increased when the abrasive is supplied to the sand blast gun 44. Even if it is small, the ejector effect can be fully utilized.
- the abrasive hose 48 is preferably attached as short as possible and without slack. By doing so, the ejector effect can be utilized more effectively.
- the air containing dust is conveyed to the dust collection unit 80 via the conveyance pipe 72.
- the dust collector 80 is a known dust collector.
- the dust collecting unit 80 is connected to the classifying unit 70 in a sealed state via the transport pipe 72.
- a cartridge filter 82 and a blower motor 83 capable of changing the rotation speed are provided, and dust contained in the air can be collected.
- the dust collected by the cartridge filter 82 is periodically wiped off by a pulse jet and stored in the storage unit 84 provided at the lower portion, so that the dust can be collected at a desired timing.
- clean air that has passed through the cartridge filter 82 is discharged into the atmosphere through the exhaust duct.
- the denitration catalyst 1 is a honeycomb type catalyst having a cylindrical shape having a honeycomb structure, a substantially elliptical columnar shape, a polygonal shape, or a quadrangular columnar shape, and a plurality of through holes penetrating in the longitudinal direction are arranged in a lattice shape.
- a denitration catalyst 1 has been used, and deposits adhere to the inner walls of the through holes. Further, in some cases, it may be blocked by (coal) ash or the like. In such a case, it is preferable that the closed portion is previously opened by washing or the like and then set in the grinding apparatus.
- the sand blast gun 44 When such a denitration catalyst 1 is set, the sand blast gun 44 is operated by adjusting the pressure of the air regulator 46 to a predetermined pressure, and when the blower motor 83 of the dust collecting unit 80 is operated, air flows from the sand blast gun 44. At the same time, abrasive is injected. At this time, the mixture of the abrasive and air injected from the injection port of the sandblast gun 44 passes through the upstream connecting member 30 and reaches the upstream fixing member 10.
- the mixture that has entered the upstream fixing member 10 and has reached the widening portion 12 from the tapered portion 13 has a reduced flow velocity, and stays temporarily in the widening portion 12 for a short time, but the flow of the mixture.
- Directional reordering occurs.
- the mixture collides with the screen member 15 and passes through the screen member 15 while being scattered in multiple directions, and the flow of the mixture is further rearranged on the downstream side of the screen member 15 of the expanding portion 12.
- the differential pressure is generated by the suction by the dust collection unit 80 between the upstream side and the downstream side of the denitration catalyst 1, the mixture temporarily staying in the expansion unit 12 is sucked from the dust collection unit 80. It is sucked by the force and sent into the through hole of the denitration catalyst 1. Thereby, damage to the upstream end face of the denitration catalyst 1 is suppressed as much as possible.
- the abrasive is introduced at a uniform amount and at a uniform flow rate into all the through holes arranged from the central portion to the peripheral portion of the cross section of the denitration catalyst 1, the inner walls of all the through holes can be ground uniformly. Can do.
- the cross-sectional area of the expanded portion 12 of the upstream fixing member 10 is preferably about 3 to 10 times the cross-sectional area S of the denitration catalyst 1, and the volume of the upstream fixing member 10 is ( ⁇ ((3 to 10) ⁇ S )) Preferably about 3 .
- the opening of the screen member 15 may have a function of diffusing and rearranging the flow of the mixture by collision, and may be selected from about # 8 to # 40, for example.
- the mixture rearranged in the expanded portion 12 of the upstream fixing member 10 in this manner is sucked into the through hole of the denitration catalyst 1 by the differential pressure before and after the denitration catalyst 1 with the downstream fixing member 20. It is preferable that the pressure in the downstream fixing member 20 is set to be 4 to 8 kPa lower than the pressure in the upstream fixing member 10.
- the denitration catalyst 1 in order to grind the denitration catalyst 1 as uniformly as possible in the cross-sectional direction, it is preferable to secure a certain length of the straight pipe portion 22 of the downstream fixing member 20. Further, even if there is no change in the cross-sectional area in the flow direction as in the straight pipe portion 22, the flow in the central portion in the cross-sectional direction becomes faster, and the diameter continues to the connecting portion 24 having a small cross-sectional area via the tapered portion 23. Therefore, there is a possibility that the flow in the central portion is further increased in the vicinity of the tapered portion 23. This results in that the central portion of the denitration catalyst 1 is easily ground.
- the rectangular plate-shaped regulating member 25 is provided in the radially central portion of the straight pipe portion 22.
- the restricting member 25 preferably has a size having an area of 1 ⁇ 4 to 1 ⁇ 2 of the cross-sectional area of the denitration catalyst 1, preferably about 1 /.
- the shape of the restriction member 25 in plan view is preferably a shape similar to the cross-sectional shape of the denitration catalyst 1, but is not limited thereto, and may be, for example, a disk shape.
- a ceramic-based abrasive such as alumina, silicon carbide, zirconia, or zircon
- a grinding material having a particle size of # 16 to # 80 mesh.
- FIG. 3 shows a cross section of the main part of the grinding apparatus used in this embodiment
- FIG. 4 shows a cross section of the member to be ground.
- the outline of the grinding apparatus other than the member to be ground is the same as that of the above-described embodiment, and members having the same action are denoted by the same reference numerals and redundant description is omitted.
- a member to be ground is one in which dummy cells 2 are arranged around the denitration catalyst 1.
- the dummy cell 2 has a through-hole that is the same as or similar to that of the denitration catalyst 1 and is disposed on the radially outer side of the denitration catalyst 1.
- the material of the dummy cell 2 is not particularly limited as long as it has wear resistance. For example, it may be a ceramic similar to the denitration catalyst 1 or a material such as a metal.
- the upstream fixing member 10A and the downstream fixing member 20A are the same as those in the first embodiment except that the connecting members 11A and 24A having large dimensions matched to the member to be ground including the dummy cell 2 are provided and the regulating member 25 is not provided. It is.
- the denitration catalyst 1 is disposed only in the central portion where the flow velocity is substantially uniform among the flow of the mixture of the abrasive and air from the upstream fixing member 10A through the member to be ground to the downstream fixing member 20A. Will be.
- the mixture at the peripheral portion where the flow velocity tends to decrease passes through the dummy cell 2.
- the denitration catalyst 1 is designed to have an area of 30% or less, preferably about 5 to 15% of the cross-sectional area, a sufficient effect is exhibited.
- Test Example 1 The honeycomb-type denitration catalyst 1 having a cross-sectional outer diameter of 150 mm ⁇ 150 mm, a length of 860 mm, a mesh opening of 6 mm, and 6 mm ⁇ 6 mm cross-sectional rectangular through-holes at a pitch of 7 mm, 400 of the above-described first embodiment. It was placed in the apparatus, and # 46 alumina was used as an abrasive, and grinding was performed with a target grinding amount of 100 ⁇ m. At this time, the differential pressure before and after the denitration catalyst 1 was 5.4 kPa.
- the results of measuring the grinding rate at a plurality of positions in the length direction of through holes (83 locations) at predetermined positions are shown in FIG. 5 as a line graph for each through hole. (Example 1). From this result, the variation between the line graphs corresponds to the grinding variation in the cross-sectional direction, and the variation in the length direction of each line graph corresponds to the grinding variation in the length direction.
- the processing is performed by introducing an abrasive from the outlet side of the denitration catalyst 1, and the distance from the catalyst inlet side in the graph indicates the distance from the catalyst inlet side (processing outlet side).
- the grinding rate is defined as follows, and a target grinding amount of 100 ⁇ m corresponds to a grinding rate of 3.34%.
- the processing reduction rate calculated from the total weight before and after grinding in Example 1 was 12.23%, and the actual grinding amount determined from this was 102 ⁇ m.
- FIG. 6 shows the result of the same test with only the regulating member 25 removed (Example 2).
- the processing reduction rate of Example 2 was 100 ⁇ m.
- Test Example 2 The same as in the second embodiment, except that a dummy cell 2 having a cross-sectional area of 10% is uniformly arranged on the outer side in the radial direction of the denitration catalyst 1 as in Test Example 1, and the regulating member 25 is removed.
- the same test as in Test Example 1 was performed with a simple grinding apparatus.
- FIG. 9 shows the results of measuring the grinding rate for a plurality of positions in the length direction of through holes (83 locations) at predetermined positions with respect to the denitration catalyst after processing, as a line graph for each through hole. (Example 3).
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Abstract
Description
本実施形態で用いる研削装置の概略構成を図1に、その要部断面を図2にそれぞれ示す。
本実施形態で用いる研削装置の要部断面を図3に、その被研削部材の横断面を図4にそれぞれ示す。なお、本実施形態は、被研削部材を変更した以外の研削装置の概要は上述した実施形態と同様であり、同一作用を示す部材には、同一符号を付して重複する説明は省略する。
断面外径が150mm×150mmで、長さが860mmであり、目開き6mmで、6mm×6mmの断面矩形の貫通孔を7mmピッチで400有するハニカム型の脱硝触媒1を上述した実施形態1の研削装置に配置し、研削材として#46のアルミナを用い、目標研削量100μmで研削した。この時の脱硝触媒1の前後の差圧は5.4kPaであった。
試験例1と同様な脱硝触媒1の径方向外側に、断面積で10%となるダミーセル2を均一に配置したものを被研削部材とし、規制部材25を外した以外は、実施形態2と同様な研削装置で、試験例1と同様な試験を行った。
10 上流固定部材
20 下流固定部材
30 上流側連結部材
40 混合部
50 コンプレッサー
60 下流側連結部材
70 分級部
80 集塵部
Claims (4)
- 脱硝触媒からなる被研削部材の一端部に、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を連結する一方、前記被研削部材の他端部に、当該被研削部材との連結側端部から所定寸法だけ一定断面積の流路を具備する下流固定部材を連結し、
前記上流固定部材の上流側には、研削材と気体とを混合する混合部を前記拡開部より小さな断面積の流路を有する連結部材で連結すると共に前記拡開部の内方の前記被研削部材側に所定目開きのスクリーン部材を配置し、一方、前記下流固定部材の前記連結部材の下流側には、前記被研削部材の貫通孔を通過した研削材と当該研削材により研削された被研削物とを分離する分級部と、該分級部を介して前記混合部の気体を吸引する集塵部とを連結し、
前記集塵部による吸引により、前記混合部からの前記気体に混合された研削材を前記上流固定部材に送り、前記拡開部で流速を低下させて前記気体と研削材との混合物を一時的に滞留させた後、当該混合物を前記脱硝触媒の貫通孔及び前記下流固定部材を通過させて当該貫通路の内壁を研削し、その後、前記分級部を介して前記集塵部で集塵する
ことを特徴とする脱硝触媒の再生方法。 - 請求項1に記載の脱硝触媒の再生方法において、前記固定部材の前記分級部側には流路の中央部の流れを規制する規制部材を配置したことを特徴とする脱硝触媒の再生方法。
- 請求項1又は2に記載の脱硝触媒の再生方法において、前記被研削部材は、脱硝触媒の外周にダミーセルを配置したものであることを特徴とする脱硝触媒の再生方法。
- 請求項1~3の何れか一項に記載の脱硝触媒の再生方法において、前記被研削部材を立設状態で保持して当該被研削部材の下端部を前記上流固定部材で固定すると共に、上端部を前記下流固定部材で固定することを特徴とする脱硝触媒の再生方法。
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JP2018167169A (ja) * | 2017-03-29 | 2018-11-01 | 中国電力株式会社 | 脱硝触媒の再利用方法 |
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 |
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US20160051976A1 (en) | 2016-02-25 |
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KR101844362B1 (ko) | 2018-04-02 |
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