WO2019038919A1 - Réacteur de dénitrification - Google Patents

Réacteur de dénitrification Download PDF

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Publication number
WO2019038919A1
WO2019038919A1 PCT/JP2017/030581 JP2017030581W WO2019038919A1 WO 2019038919 A1 WO2019038919 A1 WO 2019038919A1 JP 2017030581 W JP2017030581 W JP 2017030581W WO 2019038919 A1 WO2019038919 A1 WO 2019038919A1
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WO
WIPO (PCT)
Prior art keywords
support
catalyst
inlet duct
brace
denitrification reactor
Prior art date
Application number
PCT/JP2017/030581
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English (en)
Japanese (ja)
Inventor
悠孝 平田
政治 森井
龍二 堤
俊昭 其木
木村　修
Original Assignee
三菱日立パワーシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱日立パワーシステムズ株式会社 filed Critical 三菱日立パワーシステムズ株式会社
Priority to PCT/JP2017/030581 priority Critical patent/WO2019038919A1/fr
Publication of WO2019038919A1 publication Critical patent/WO2019038919A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes

Definitions

  • the present invention relates to a denitrification reactor.
  • a large NOx removal reactor is installed to remove nitrogen oxides (NOx) in the exhaust gas from the boiler.
  • the denitrification reactor used in the boiler plant is, for example, a large structure having a size of 25 m wide ⁇ 11 m deep, and a weight exceeding 1000 t. And about 60% of this weight is the weight of the catalyst, and the denitrification reactor is composed of a large-scale steel frame structure to support the catalyst.
  • Patent Document 1 is known as a denitrification reactor of this type.
  • the denitrification reactor described in Patent Document 1 supports an inlet duct into which exhaust gas from a boiler flows, a plurality of catalyst supporting structures disposed below the inlet duct and supporting the catalyst block, and the catalyst supporting structures. It is configured to have a plurality of pillars and the like.
  • the ceiling surface of the inlet duct is sloped downward from the upstream side to the downstream side of the exhaust gas flow path, and the exhaust gas from the boiler changes 90 degrees in the inlet duct and flows into the catalyst block of the catalyst support structure.
  • the catalyst support structure is a grid-like structure in which a catalyst support beam and a catalyst receiving beam are arranged in a grid and these are surrounded by an outer peripheral frame, and such a support structure is a plurality of column bases It is supported by That is, in Patent Document 1, the load of the catalyst block is transmitted from the support structure to the plurality of column bases, and the plurality of column bases support the load.
  • Patent Document 1 since the load of the catalyst block applied to the support structure is supported only by the plurality of column bases, the strength member of each beam of the support structure is rigid in order to withstand the load of the catalyst block. It is necessary to use high members, and the problem remains in reducing the size and weight of the NOx removal reactor.
  • the present invention aims to reduce the size and weight of the denitrification reactor.
  • a plurality of catalyst support structures arranged in a hierarchy in the vertical direction, each supporting a catalyst block with a horizontally extending support beam, and the plurality of catalyst support structures
  • the inlet duct is a truss structure having a brace provided on the upstream side in the same vertical plane and a reinforcing plate provided on the downstream side, wherein the brace is provided.
  • the support beam are connected via a hanging member extending in the vertical direction.
  • the above-described features make it possible to reduce the size and weight of the NOx removal reactor.
  • the subject except having mentioned above a structure, and an effect are clarified by description of the following embodiment.
  • FIG. 1 is a block diagram of the combination of a denitrification reactor according to an embodiment of the present invention and a boiler
  • FIG. 2 is an entire configuration diagram of the denitrification reactor according to an embodiment of the present invention
  • FIG. 3 is the denitrification reactor shown in FIG. 4 is a cross-sectional view showing the internal configuration
  • FIG. 4 is a perspective view showing the internal configuration of the denitrification reactor shown in FIG. 2
  • FIG. 5 is a layout of braces and reinforcing plates provided in the inlet duct
  • the left and right direction in FIGS. 2 and 3 is defined as the “depth direction”, and the front and back direction in the drawing is defined as the “width direction”.
  • a denitrification reactor 2 As shown in FIG. 1, a denitrification reactor 2 according to an embodiment of the present invention is connected to an exhaust gas outlet of a boiler 1 and supported by a horizontal support steel frame 3. And the denitrification reactor 2 is removing the nitrogen oxide in the waste gas which generate
  • the denitrification reactor 2 is configured to be hierarchically (three hierarchical layers in this embodiment) vertically below the inlet duct 4 connected to the exhaust gas outlet of the boiler 1 and the inlet duct 4.
  • the inlet duct 4 includes three catalyst support structures S arranged to support a large number of catalyst blocks 5 and four column bases 6 supporting the four corners of the three catalyst support structures S, respectively. Are provided at the upper ends of the four columns 6.
  • each side surface of the denitrification reactor 2 is covered with a side casing 7 (see FIG. 4).
  • the inlet duct 4 is a bend portion that allows the exhaust gas from the boiler 1 to flow into the catalyst block 5 of the catalyst support structure S.
  • the ceiling surface of the inlet duct 4 is from the upstream side to the downstream side of the exhaust gas flow path It is sloped downhill towards.
  • the exhaust gas from the boiler 1 travels obliquely downward along the inclined ceiling surface of the inlet duct 4, changes its flow by 90 degrees, and flows into the catalyst block 5.
  • a screen plate 8 is disposed on the floor surface of the inlet duct 4, and the screen plate 8 functions as a straightening vane that makes the flow of exhaust gas toward the catalyst block 5 uniform.
  • the screen plate 8 is installed with a minimum gap in the plane direction, and a rib plate 14 described later is installed in the gap.
  • the catalyst support structure S includes a plurality of first support beams 9 and a plurality of first support beams 9 which are disposed in parallel in the same horizontal plane at intervals in the width direction. And a plurality of second support beams 10 and a plurality of second support beams 10 arranged in parallel with a plurality of second support beams 10 arranged in parallel at intervals in the direction orthogonal to the direction (depth direction). It is formed by attaching a rectangular frame-shaped outer peripheral frame 11 so as to surround it, and has high rigidity that can support a large number of catalyst blocks 5.
  • H-shaped steel is used for the 1st support beam 9, the 2nd support beam 10, and the outer peripheral frame 11, the cross-sectional shape does not matter.
  • the catalyst support structure S needs to support a large load because a large number of catalyst blocks 5 are placed, but in the present embodiment, a part of the load is taken through the lifting plate (hanging member) 7 as an inlet There is a big feature in the point received by the truss structure of the duct 4. This feature is specifically described below.
  • each brace 12 and the reinforcing plate 13 are provided in the same vertical plane including the first support beam 9 of the catalyst support structure S, and a set of such braces 12 and the reinforcing plate 13 A plurality of sets are provided in the inlet duct 4 on the screen plate 8 at intervals in the width direction.
  • each brace 12 is connected to a rib plate 14 attached to a beam member of the ceiling surface and the floor surface of the inlet duct 4, and the rib plate 14 is a node of the truss structure.
  • the rib plate 14 attached to the beam member of the floor surface of the inlet duct 4 is installed in the gap of the screen plate 8.
  • the reinforcing plate 13 is made of a relatively thin steel plate or the like, and the reinforcing plate 13 is attached to a triangular (saddle-shaped) area where the ceiling surface and the floor surface on the downstream side of the inlet duct 4 intersect.
  • the area of the inlet duct 4 is lower in height than the upstream side, and it is difficult to attach the brace 12 to make a truss structure as in the upstream side, but since it is a wedge-shaped portion with a low height, Even if the reinforcing plate 13 is used, the problem of buckling is less likely to occur.
  • the base of the reinforcing plate 13 in the shape of an isosceles triangle is attached to the beam member of the floor of the inlet duct 4 and one oblique side is attached to the beam of the ceiling of the inlet duct 4
  • the shape of the reinforcing plate 13 is not limited to the isosceles triangle, and may be another shape such as a right triangle.
  • each catalyst support structure S is provided with each rib plate 14 installed on the floor surface of the inlet duct 4 via a plurality of suspension plates 15 spaced apart in the depth direction, ie, It is connected with the nodes of the truss structure.
  • the hanging plate 15 is a single plate-like body suspended from the truss structure to the lowermost catalyst supporting structure S.
  • a metal plate material having a plate thickness t 20 mm, for example, is used as the hanging plate 15.
  • the width of the hanging plate 15 is selected to be a suitable size in accordance with the load applied to the catalyst support structure S.
  • the hanging plate 15 is coupled to the first support beam 9 of the catalyst support structure S.
  • the upper end portion of the suspension plate 15 is fixed to the rib plate 14 which is a node of the truss structure by welding, bolt or the like, and this suspension plate 15 is welded or bolted to the first support beam 9 of the catalyst support structure S of each layer. It is fixed by. According to this configuration, since the single supporting plate 15 can be coupled to the first support beams 9 of each layer without being cut, manufacture of the NOx removal reactor 2 is simplified.
  • the load applied to the first support beam 9 of the catalyst support structure S is supported by the both ends (column base 6), and the center portion of the beam is suspended by two It is supported at two places by the plate 15. Therefore, the bending moment applied to the entire first support beam 9 is significantly reduced, and the size of the shaped steel used as the first support beam 9 can be reduced.
  • the load applied to the first support beam 9 is transmitted to the inlet duct 4 of the truss structure at the top of the denitrification reactor 2 by the suspension plate 15 and then transmitted to the column 6 via the side casing 7 Be done. Therefore, the load applied to the first support beam 9 can be supported by the entire NOx removal reactor 2, and the load applied to the column base 6 is significantly reduced.
  • the load transfer is performed so as to transmit the load applied to the first support beam 9 to the truss structure of the inlet duct 4 installed on the upper portion of the NOx removal reactor 2 by providing the hanging plate 15
  • the load can be supported by the entire structure of the denitrification reactor 2. Therefore, the size of the first support beam 9 can be reduced, and as a result, reduction in size and weight of the denitrification reactor 2 can be realized.
  • the load of the load applied to the horizontal support steel frame 3 can be reduced.
  • the brace 12 is installed in the upstream portion of the height in the region from the upstream side to the downstream side of the inlet duct 4 to form a triangular truss structure, and an inclined ceiling surface Since the reinforcing plate 13 is fixed to the downstream portion where the space is narrowed by the above, the combination of the truss structure and the reinforcing plate 13 can firmly support the load from the suspension plate 15. Moreover, since it is possible to use a lightweight reinforcing plate 13 with a thin plate thickness, it is possible to reduce the pressure loss of the gas flowing in the inlet duct 4 and to adhere and deposit dust contained in the gas. It can be reduced.
  • the flange width of the H-shaped steel used for the first support beam 9 is the conventional 300 mm to 200 mm only by providing the suspension plate 15 as in the above embodiment.
  • the height of the web can be reduced from the conventional 900 mm to about 400 mm.
  • the height of the first support beam 9 can be reduced by about 500 mm per layer if the configuration using the hanging plate 15 is used. And the effect becomes remarkable, so that a hierarchy increases.
  • FIG. 7 is a cross-sectional view showing an internal configuration of a denitrification reactor according to another embodiment of the present invention, and the same reference numerals are given to parts corresponding to FIG.
  • the height adjustment space 16 is installed between the inlet duct 4 and the catalyst support structure S of the uppermost layer, and the lifting plate 15 is used as the height adjustment space 16.
  • the truss structure of the inlet duct 4 and the first support beam 9 of the catalyst support structure S are connected longitudinally.
  • the height adjustment space 16 has a frame structure similar to that of the catalyst support structure S supporting the catalyst block 5 and has a truss structure by a plurality of braces 17 and a hanging plate longitudinally cutting the height adjustment space 16
  • the reference numeral 15 is fixed to the node of each brace 17 by welding, bolts or the like.
  • the suspension plate 15 is coupled to all the nodes of the truss structure of the inlet duct 4 and the height adjustment space portion 16, but for example, the suspension passing through the vertex side of the triangle truss structure
  • the plate 15 may be omitted, and only the bottom side node may be connected by the lifting plate 15.
  • the denitrification reactor 2 According to the denitrification reactor 2 according to the other embodiment configured as described above, even if the height of the denitrification reactor 2 can not be lowered due to the positional relationship with the boiler 1, etc., the catalyst support for the inlet duct 4 and the uppermost layer By installing the height adjustment space portion 16 between the structure S and the structure S, the positional relationship between the boiler 1 and the denitrification reactor 2 can be properly maintained.
  • the space part 16 for height adjustment is made into a truss structure and the node of the truss structure (brace 17) and the suspension board 15 were connected, the load applied to the 1st support beam 9 of catalyst support structure S is both ends (pillar In addition to being supported by the legs 6), the central portion of the beam is supported by a plurality of suspension plates 15 at a plurality of points. Therefore, the bending moment applied to the entire first support beam 9 is significantly reduced, and the size of the shaped steel used as the first support beam 9 can be reduced.

Abstract

L'objectif de l'invention est de rendre un réacteur de dénitrification plus compact et plus léger. L'invention comprend : une pluralité de structures de support de catalyseur S qui sont disposées en couches dans la direction verticale et dont chacune porte des blocs d'agents catalytiques 5 avec des poutres de support 9, 10 s'étendant dans la direction horizontale ; une pluralité de bases de colonne 6 qui portent les poutres de support 9, 10 de la pluralité de structures de support de catalyseur S ; et un conduit d'entrée 4 qui est disposé au-dessus de la pluralité de structures de support de catalyseur S et dont la paroi supérieure descend depuis le côté amont d'un canal de gaz d'échappement vers le côté aval de celui-ci. Le conduit d'entrée 4 est une structure de treillis qui comprend, sur le même plan vertical, un contrevent 12 disposé en amont et une plaque de renfort 13 disposée en aval. Le nœud de contrevent 12 est relié à une poutre de support 9 de la structure de support de catalyseur S par l'intermédiaire d'un élément suspendu 15 qui s'étend dans la direction verticale.
PCT/JP2017/030581 2017-08-25 2017-08-25 Réacteur de dénitrification WO2019038919A1 (fr)

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PCT/JP2017/030581 WO2019038919A1 (fr) 2017-08-25 2017-08-25 Réacteur de dénitrification

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Application Number Priority Date Filing Date Title
PCT/JP2017/030581 WO2019038919A1 (fr) 2017-08-25 2017-08-25 Réacteur de dénitrification

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WO2019038919A1 true WO2019038919A1 (fr) 2019-02-28

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6279528U (fr) * 1985-11-06 1987-05-21
JPH0620511B2 (ja) * 1985-03-07 1994-03-23 ドイツチエ バブコツク ヴエルケ アクチエンゲゼルシヤフト 燃焼ガス等の高温のガスを処理する装置に使用されるケ−シング
JPH06108575A (ja) * 1992-09-30 1994-04-19 Misawa Homes Co Ltd マンサード屋根構造とその施工方法
JP2002048329A (ja) * 2000-08-03 2002-02-15 Babcock Hitachi Kk 整流装置を有する排ガス処理装置
JP2002349096A (ja) * 2001-05-22 2002-12-04 Babcock Hitachi Kk 自立型ケーシング付き構造物
US20050235595A1 (en) * 2004-04-22 2005-10-27 Bechtel Corporation Systems and methods for modular construction of large structures
WO2016133116A1 (fr) * 2015-02-18 2016-08-25 三菱日立パワーシステムズ株式会社 Système de récupération de la chaleur de gaz d'échappement
WO2017094657A1 (fr) * 2015-11-30 2017-06-08 三菱日立パワーシステムズ株式会社 Réacteur de dénitration

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0620511B2 (ja) * 1985-03-07 1994-03-23 ドイツチエ バブコツク ヴエルケ アクチエンゲゼルシヤフト 燃焼ガス等の高温のガスを処理する装置に使用されるケ−シング
JPS6279528U (fr) * 1985-11-06 1987-05-21
JPH06108575A (ja) * 1992-09-30 1994-04-19 Misawa Homes Co Ltd マンサード屋根構造とその施工方法
JP2002048329A (ja) * 2000-08-03 2002-02-15 Babcock Hitachi Kk 整流装置を有する排ガス処理装置
JP2002349096A (ja) * 2001-05-22 2002-12-04 Babcock Hitachi Kk 自立型ケーシング付き構造物
US20050235595A1 (en) * 2004-04-22 2005-10-27 Bechtel Corporation Systems and methods for modular construction of large structures
WO2016133116A1 (fr) * 2015-02-18 2016-08-25 三菱日立パワーシステムズ株式会社 Système de récupération de la chaleur de gaz d'échappement
WO2017094657A1 (fr) * 2015-11-30 2017-06-08 三菱日立パワーシステムズ株式会社 Réacteur de dénitration

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