TECHNICAL FIELD 5
[0001] The present invention relates to a vertical downflow type catalytic reactor and a catalyst block used therein. More specifically, the present invention relates to a vertical downflow type catalytic reactor capable of carrying in, installing, 10 removing and carrying out a catalyst block housing a catalyst unit in a short construction period and having an excellent ash dust accumulation prevention function, and a catalyst block used therein.
15
BACKGROUND ART
[0002] In a vertical downflow type catalytic reactor for removing nitrogen oxides (NOx) contained in an exhaust gas of a coal firing boiler, for example, catalyst blocks are installed side by side, wherein a 20 short side of the bottom surface of the catalyst block is on a supporting beam to support the catalyst block. To reduce the exhaust gas flowing between an inner wall of a reactor duct and the catalyst block and between the adjacent catalyst blocks without passing 25 through a catalyst unit, or to prevent accumulation of ash dust between the inner wall of the reactor duct and the catalyst block and between the adjacent catalyst blocks, various structures have been proposed. 30
[0003] For example, Patent Document 1 discloses a seal structure of a denitration apparatus, comprising an
2
ash accumulation prevention member that is fastened and fixed to a pack frame at the end face of a catalyst pack so as to block a boundary between the catalyst packs and a boundary between the catalyst pack and a denitration reactor casing, a packing member 5 sandwiched between the ash accumulation prevention member and the pack frame of the end face of the catalyst pack, and a fastener for fastening the ash accumulation prevention member and the pack frame of the end face of the catalyst pack. 10
[0004] Patent Document 2 discloses a catalyst basket structure, wherein, in an exhaust gas passage, side portions are partitioned and a plurality of basket bodies filled with a catalyst for decomposing harmful substances in the gas are adjacent to each other at 15 predetermined intervals, the catalyst basket structure is configured to put a gable-shaped ash accumulation prevention member between the basket bodies adjacent to each other with pins or the like, so as to prevent ash accumulation at the intervals. 20
[0005] Patent Document 3 discloses a vertical downflow type flue gas denitration apparatus, which comprises a plurality of catalyst blocks housing a catalyst unit, and a slideable first ash accumulation prevention plate and a second ash accumulation 25 prevention plate in the gap between the adjacent catalyst blocks, whereby an exhaust gas discharged from a combustion device to be a vertical downflow is treated, wherein the first ash accumulation prevention plate has, at the upper part, a mountain-30 shaped structure and has, at the lower part, a hook to be inserted between a lower part of a protector 3
arranged at an upper part of the catalyst block and the upper part of the catalyst block, suspension lugs for suspending the catalyst block has elongated holes, the second ash accumulation prevention plate is detachably supported by passing a locking member into 5 the elongated hole of the suspension lug.
[0006] Patent Document 4 discloses a vertical downflow type catalytic reactor, which comprises a large number of catalyst blocks arranged in a catalytic reactor body so that the short side of the bottom 10 surface of the catalyst block is supported by a support beam, wherein the catalyst block comprises a large number of catalyst units housed in a rectangular parallelepiped frame-shaped case to be integrated, the catalyst unit comprises plate-shaped or lattice-15 shaped catalyst bodies piled and housed in a frame body, lifting hardware is provided on the short sides of each corner of the frame-shaped case, a sealing material with a circular cross section is provided above a gap between the long sides of the catalyst 20 blocks, a contact portion between the sealing material and the catalyst block is joined, an ash dust accumulation prevention plate is provided above a gap between the short sides of the catalyst blocks.
[0007] Patent Document 5 discloses a device for 25 preventing an blockage of catalyst in a denitration reactor, comprising a mountain-shaped dust adhesion prevention protective device installed on the upstream side of the gas flow between adjacent cases of catalyst units installed side by side in the 30 denitration reactor, a dust adhesion prevention protective device installed between the upstream side 4
of the gas flow of the case of catalyst unit adjacent to an inner wall of the denitration reactor and the inner wall so that the tip of the dust adhesion prevention protective device is in contact with the inner wall, and a mountain-shaped dust adhesion 5 prevention protective device installed on the upstream side of the gas flow of the catalyst unit installation rail, wherein a sealing material for sealing a gap between the long sides at the lower parts of the catalyst blocks to bond the contact 10 portion between the sealing material and the catalyst block. [0008] Patent Document 6 discloses a diverter having a shape such as a chevron or a T-shape for preventing particles from entering a gap between adjacent 15 catalyst blocks.
CITATION LIST
PATENT LITERATURES
[0009] Patent Document 1 : JP S60-124629 U 20
Patent Document 2 : JP S60-183030 U
Patent Document 3 : WO 2012/004980 A1
Patent Document 4 : JP 2002-219336 A
Patent Document 5 : JP S58-143828 A
Patent Document 6 : US 2009/0065414 A1 25
SUMMARY OF THE INVENTION
PROBLEMS TO BE RESOLVED BY THE INVENTION
[0010] An object of the present invention is to provide a vertical downflow type catalytic reactor 30 having an excellent ash dust accumulation prevention function, and a catalyst block used therein, wherein 5
a catalyst block in which a catalyst unit is housed can be carried in, installed, removed from and carried out the reactor in a short construction period.
MEANS FOR SOLVING THE PROBLEMS 5
[0011] Studies for solving the above problems have resulted in completion of present invention including the following embodiments.
[0012] [1] A catalytic reactor, comprising
a reactor duct which allows a combustion exhaust gas 10 to flow in a vertical downflow,
at least two beams,
a catalyst block comprising a frame-shaped case and a catalyst unit housed in the frame-shaped case,
a first diversion member and 15
a second diversion member,
wherein the beam is horizontally provided inside the reactor duct,
the frame-shaped case has a cuboid or cubic shape,
the catalyst block is bridged between two of the beams 20 to be supported by the two beams,
the catalyst blocks are adjacently laid side by side in the reactor duct so that a front surface of the frame-shaped case and a rear surface of the adjacent frame-shaped case face each other and a right side 25 surface of the frame-shaped case and a left side surface of the adjacent frame-shaped case face each other,
the frame-shaped case has a stopper member attached to the upper part of the front surface and / or the 30 rear surface, and a spacer member attached to the right side surface and / or the left side surface, 6
the first diversion member is mounted so as to occlude a gap between the front surface and the rear surface of the adjacent catalyst blocks from above, and
the second diversion member is mounted so as to occlude a gap between the right side surface and the 5 left side surface of the adjacent catalyst blocks from above.
[0013] [2] A catalytic reactor, comprising
a reactor duct which allows a combustion exhaust gas to flow in a vertical downflow, 10
at least two beams,
a catalyst block comprising a frame-shaped case and a catalyst unit housed in the frame-shaped case,
a first diversion member and
a second diversion member, 15
wherein the beam is horizontally provided inside the reactor duct,
the frame-shaped case has a cuboid or cubic shape,
the catalyst block is bridged between two of the beams to be supported by the two beams, 20
the catalyst blocks are adjacently laid side by side in the reactor duct so that a front surface of the frame-shaped case and a rear surface of the adjacent frame-shaped case face each other and a right side surface of the frame-shaped case and a left side 25 surface of the adjacent frame-shaped case face each other,
the frame-shaped case has a first suspending equipment attached to the upper part of the front surface and / or the rear surface, a second suspending equipment 30 attached to the upper part of the rear surface and / or the front surface, and a spacer member attached to 7
the right side surface and / or the left side surface,
the first diversion member is mounted so as to occlude a gap between the front surface and the rear surface of the adjacent catalyst blocks from above, and
the second diversion member is mounted so as to 5 occlude a gap between the right side surface and the left side surface of the adjacent catalyst blocks from above.
[0014] [3] The vertical downflow type catalytic reactor according to [1] or [2], wherein the frame-shaped 10 case further has a sealing member attached so as to seal the lower part between the adjacent catalyst blocks and between the two beams.
[0015] [4] A catalyst block used in the catalytic reactor described in [1], comprising a frame-shaped case and 15 a catalyst unit housed in the frame-shaped case, wherein the frame-shaped case has a cuboid or cubic shape, and the frame-shaped case has a stopper member attached to the upper part of the front surface and / or the rear surface and a spacer member attached to 20 the right side surface and / or the left side surface.
[0016] [5] The catalyst block according to [4], wherein the stopper member has a screwed portion.
[0017] [6] A catalyst block used in the catalytic reactor described in [2], comprising a frame-shaped case and 25 a catalyst unit housed in the frame-shaped case, wherein the frame-shaped case has a cuboid or cubic shape, and the frame-shaped case has a first suspending equipment attached to the upper part of the front surface and / or the rear surface, a second 30 suspending equipment attached to the upper part of the rear surface and / or the front surface, and a 8
spacer member attached to the right side surface and / or the left side surface.
[0018] [7] The catalyst block according to [6], wherein the first suspending equipment has a screwed portion . 5
[0019] [8] The catalyst block according to any one of [4] to [7], wherein the frame-shaped case further has a sealing member attached so as to seal the lower part between the adjacent catalyst blocks and between the two beams. 10
[0020] [9] The catalyst block according to any one of [4] to [8], wherein the frame-shaped case further has a second diversion member attached so as to occlude a gap between the right side surface and the left side surface of the adjacent catalyst blocks from above. 15
ADVANTAGEOUS EFFECTS OF THE INVENTION
[0021] The catalyst block of the present invention can be quickly installed to be arranged so that gaps between the inner wall of the reactor duct and the 20 catalyst block and between the adjacent catalyst blocks are in predetermined interval. The vertical downflow type catalytic reactor of the present invention can carry in, install, remove and carry out the catalyst block housing a catalyst unit in a short 25 construction period, and has an excellent ash dust accumulation prevention function.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] [FIG. 1] is an oblique perspective view showing an 30 example of a catalyst unit.
[FIG. 2] is an oblique perspective view showing an 9
example of the process of manufacturing a catalyst block by housing a catalyst unit into a frame-shaped case.
[FIG. 3] is an oblique perspective view showing an example of a catalyst block. 5
[FIG. 4] is an oblique perspective view showing an example of a process of assembling a catalyst block, a first diversion member, and a second diversion member to manufacture a catalytic reactor.
[FIG. 5] is an oblique perspective view showing an 10 example of a first diversion member.
[FIG. 6] is an oblique perspective view showing an example of a second diversion member.
[FIG. 7] is an oblique perspective view showing an example of another catalyst block. 15
[FIG. 8] is an oblique perspective view showing an example of another catalyst block.
[FIG. 9] is a side view showing an example of the configuration inside the reactor.
[FIG. 10] is a front view showing an example of the 20 configuration inside the reactor.
[FIG. 11] is an oblique perspective view showing an example of another catalyst block.
[FIG. 12] is a view showing an example of the process of manufacturing a catalytic reactor. 25
EMBODIMENTS FOR CARRYING OUT THE INVENTION
[0023] The present invention will be described in more detail by showing embodiments of the present invention based on the drawings. 30
[0024] The catalytic reactor of the present invention comprises a reactor duct 2, a beam 33, a catalyst
10
block 20, a first diversion member 31 and a second diversion member 32 (see FIG. 9 or 10).
[0025] The reactor duct 2 has a vertical flow path through which the combustion exhaust gas can flow in a vertical downflow. The cross-sectional shape of 5 the flow path of the reactor duct when viewed from the gas flow direction is not particularly limited, but is preferably rectangular. The size of the flow path cross section of the reactor duct is preferably substantially the same from an inlet of the reactor 10 duct to an outlet of the reactor duct. An entrance duct is connected to the inlet of the reactor duct, wherein the entrance duct allows combustion exhaust gas to flow from an exhaust duct of a combustion device such as a boiler. The entrance duct may have 15 a horizontal flow path. A joint duct having a downwardly inclined flow path connecting a horizontal flow path and a vertical flow path may be provided between the entrance duct having the horizontal flow path and the reactor duct 2 having the vertical flow 20 path. The size of the flow path cross section of the entrance duct and the exit duct may be smaller, the same, or larger than that of the reactor duct. A device (for example, a screen plate, a straightening vane, etc.) for evenly flowing the combustion exhaust 25 gas to the catalyst block 20 can be provided in the reactor duct. Further, a device for supplying a reducing agent such as ammonia can be provided in front of the catalyst block 20, for example, in the upper part of the reactor duct 2, in the entrance 30 duct, or in the joint duct.
[0026] A beam 33 is horizontally spread in the reactor 11
duct. As shown in FIG. 4 and the others, the catalyst block 20 is bridged between the two beams and supported by the two beams. A plurality of catalyst blocks 20 are adjacently installed side by side in the reactor duct so that the front surface of the 5 frame-shaped case and the rear surface of the adjacent frame-shaped case face each other, and the right side surface of the frame-shaped case and the left side surface of the adjacent frame-shaped case face each other. The cross section of the beam 33 is usually 10 box-shaped, H-shaped, or T-shaped. In FIG. 4, the catalyst block is bridged so that the front surface or the rear surface is parallel to the beam. However, the catalyst block may be bridged so that the right side surface or the left side surface is 15 parallel to the beam.
[0027] The catalyst block 20 comprises a frame-shaped case 21 and at least one catalyst unit 10 housed in the frame-shaped case 21. Although not shown in the drawings, legs may be provided at the lower part of 20 the frame-shaped case so that the bottom surface of the catalyst unit 10 is higher than the upper surface of the beam. The leg is not restricted by the shape, may be in the shape of a cylinder or a grid in which the lower part of the frame constituting the frame-25 shaped case is extended downward or may be cylindrical or grid-shaped leg member that can be attached to the bottom surface of the frame-shaped case. In addition, when the multiple catalyst units are housed side by side in the horizontal direction, the leg is also 30 preferably provided below the gap between the adjacent catalyst units. When such grid-like legs are 12
provided, the four corners of the bottom surface of the catalyst unit are firmly supported.
[0028] The catalyst unit 10, for example, comprises a frame body 13 and a catalyst body 12 housed in the frame body (FIG. 1) or a catalyst body 12 itself. 5 The catalyst body 12 can have a shape such as a grid shape, a honeycomb shape, a corrugated board shape, or a plate shape. The catalyst body 12 used in the denitration reaction comprises a denitration catalytic active component. As the denitration 10 catalytic active component, mentioned can be a titanium-based catalyst comprising an oxide of titanium, an oxide of molybdenum and / or tungsten, and an oxide of vanadium; a zeolite-based catalyst comprising mainly an aluminosilicate such as zeolite 15 and a metal such as Cu or Fe, etc supported on the aluminosilicate and a mixed catalyst formed by mixing the titanium-based catalyst and the zeolite-based catalyst. Of these, the titanium-based catalyst is preferable. 20
Examples of the titanium-based catalyst can include Ti-V-W catalysts, Ti-V-Mo catalysts, Ti-V-W-Mo catalysts and the like.
A ratio of a V element to a Ti element is preferably not more than 2% by weight, more preferably 25 not more than 1% by weight, in terms of a weight percentage of V2O5 / TiO2. A ratio of a Mo element and / or a W element to the Ti element is preferably not more than 10% by weight, more preferably not more than 5% by weight, in terms of a weight percentage of 30 (MoO3 + WO3) / TiO2.
The catalyst body may comprise a co-catalyst
13
or an additive. Examples of the co-catalyst or the additive can include an oxide of P, an oxide of S, an oxide of Al (for example, alumina), an oxide of Si (for example, glass fiber), an oxide of Zr (for example, zirconia), gypsum (eg, dihydrate gypsum, 5 etc.), zeolite and the like. These can be used for catalyst preparation in the form of powders, sol, slurries, fibers or the like.
[0029] The frame body 13 is not particularly limited in shape as long as it can house the catalyst body 10 12, but it is preferable that the frame body 13 is a cuboid shape or a cubic shape as a whole. The frame body 13 has at least an inlet port and an outlet port so that the combustion exhaust gas G can flow into and out of an area (catalyst layer) where the catalyst 15 body is housed.
[0030] The frame-shaped case 21 is preferably formed as a cuboid shape or a cubic shape as a whole. The frame-shaped case has at least an inlet port and an outlet port so that the combustion exhaust gas can 20 flow into and out of the catalyst unit. It is preferable that the catalyst unit is housed in the frame-shaped case to be integrated so that the inlet port and outlet port of the catalyst unit are on the same side as the inlet port and outlet port of the 25 frame-shaped case.
[0031] (1st Embodiment)
In the catalyst block 20 shown in FIG. 2 or 3, the frame-shaped case 21 has a first suspending equipment 22, a second suspending equipment 23, and a 30 spacer member 25, and if necessary, a sealing member 26. 14
[0032] The catalyst block 20 can be suspended with a hoist or dedicated instrument by fitting the first suspending equipment 22 and the second suspending equipment 23 with a crane tool (for example, a wire rope, a wire sling, etc.). 5
[0033] In the catalyst block shown in FIG. 2 or 3, two first suspending equipments 22 are attached to the upper part of the front surface of the frame-shaped case, and two second suspending equipments 23 are attached to the upper part of the rear surface of the 10 frame-shaped case.
[0034] It is preferable that the second suspending equipment 23 is attached at a position not facing the first suspending equipment attached to the upper part of the front surface of the frame-shaped case of the 15 adjacent catalyst block, when a plurality of the catalyst blocks 20 are adjacently installed side by side in the reactor duct so that the front surface of the frame-shaped case face and the rear surface of the adjacent frame-shaped case face each other, to 20 prevent the first suspending equipment and the second suspending equipment from colliding with each other. For example, as shown in FIG. 2 or 3, one first suspending equipment can be attached to each of near both side ends of the upper part of the front surface 25 of the frame-shaped case, and one second suspending equipment can be attached to each of slightly inside from both side ends of the upper part of the rear surface of the frame-shaped case. The attachment to the position where the first suspending equipment and 30 the second suspending equipment do not face each other is not limited to these examples, and can be performed 15
in other embodiments. Although not shown in the drawings, instead of the attachment shown in FIG. 2 or 3, for example, one second suspending equipment 23 can be attached to each of near both side ends of the upper part of the front surface of the frame-5 shaped case, and one first suspending equipment 22 can be attached to each of slightly inside from both side ends of the upper part of the rear surface of the frame-shaped case, or one first suspending equipment 22 can be approximately diagonally attached 10 to near left end of the upper part of the front surface of the frame-shaped case and to slightly inside from near right end of the upper part of the rear surface of the frame-shaped case respectively and one second suspending equipment 23 can be approximately 15 diagonally attached to near right end of the upper part of the front surface of the frame-shaped case and to slightly inside from near left end of the upper part of the rear surface of the frame-shaped case respectively. 20
[0035] The first suspending equipment 22 and the second suspending equipment 23 are not particularly limited by the shape as long as the crane tool can be fitted. Examples of the shape can include an L-shaped hook, a J-shaped hook, a U-shaped hook, a C-25 shaped hook, an O-shaped ring, a D-shaped ring, and the like.
It is preferable that the first suspending equipment 22 further has a screwed portion. At the screwed portion, the first diversion member described 30 later can be screwed on the first suspending equipment. An L-shaped hook made by bending a flat 16
plate can be used as the first suspending equipment, for example, wherein a screwed portion is provided on one plate part of the bended flat plate, and another plate part of the bended flat plate is attached on the frame-shaped case by welding or the like. The 5 screwed portion may be provided by making a hole in a desired place and threading it, or by making a hole in a desired place and welding a nut in accordance with the hole.
[0036] On the inner wall of the reactor duct facing 10 the front surface or rear surface of the catalyst block, a member for ensuring a gap between the inner wall and the front surface or the rear surface of the catalyst block closest to the inner wall may be attached. Further, the inner wall may have a 15 structure for mounting the third diversion member by screwing, inserting, etc. so as to occlude the gap between the reactor duct and the front surface or the rear surface of the catalyst block. The third diversion member may have the similar shape to the 20 first diversion member or the second diversion member described later.
[0037] The attached first suspending equipment 22 and the attached second suspending equipment 23 may or may not protrude upward beyond the upper end of the 25 frame-shaped case 21. When the first suspending equipment and the second suspending equipment are attached so as to protrude upward as described above, they can be used as a guide for vertically stacking the catalyst blocks. 30
A period from installing a new catalyst block in the reactor duct to using it up and replacing it
17
is from several months to several years. The first suspending equipment and the second suspending equipment are useful effectively, even during that period, for example, when inspecting a part of the catalyst blocks, catalyst unit or the catalyst bodies 5 or temporarily replacing them.
[0038] In the catalyst block shown in FIG. 2 or 3, the spacer member 25 is attached to the right side surface of the frame-shaped case.
When multiple catalyst blocks are installed 10 side by side in the reactor duct so that the right side surface of the frame-shaped case and the left side surface of the adjacent frame-shaped case face each other, the spacer member 25 secures a gap between the right side surface of the frame-shaped case and 15 the left side surface of the adjacent frame-shaped case so that a second diversion member, which will be described later, can be inserted to be fixed.
[0039] In the catalyst block shown in FIGS. 2 or 3, one spacer member 25 is attached to each of near both 20 side ends of the upper part of the right side surface of the frame-shaped case, and nothing is attached to that of the left side surface of the frame-shaped case. As long as a gap can be secured between the right side of the frame-shaped case and the left side 25 of the adjacent frame-shaped case, instead of attaching two spacer members to the right side surface of the frame-shaped case, two spacer members may be attached to the left side surface of the frame-shaped case, alternatively, the spacer member may be 30 diagonally attached to the right side surface closer to the front surface and the left side surface closer 18
to the rear surface respectively, or vice versa. From the viewpoint of ease of inserting the second diversion member 32 which will be described later, it is preferable to attach the spacer member to the upper part of the side surface of the frame-shaped case. 5
When multiple catalyst blocks are installed side by side in the reactor duct so that the right side surface of the frame-shaped case and the left side surface of the adjacent frame-shaped case face each other, it is preferable that the spacer member 10 attached to the frame-shaped case of one catalyst block is attached at a position not facing the other spacer members attached to the frame-shaped case of the adjacent catalyst block, to avoid a collision between them. 15
[0040] On the inner wall of the reactor duct facing the right side surface or the left side surface of the catalyst block, a member for ensuring a gap between the inner wall and the left side surface or the right side surface of the catalyst block closest 20 to the inner wall may be attached. The inner wall further may have a structure for mounting the fourth diversion member by screwing, inserting, etc. so as to occlude the gap between the reactor duct and the left side surface or the right side surface of the 25 catalyst block. The fourth diversion member may have the similar shape to the first diversion member or the second diversion member described later.
[0041] Since the catalyst block shown in FIG. 2 or 3 is bridged so that the front surface or the rear 30 surface is parallel to the beam, the sealing member 26 is attached to the lower portion (preferably the
19
lower end) of the right side surface of the frame-shaped case. When the catalyst blocks are placed side by side in the reactor duct, the lower part of the gap between the front surface and the rear surface is sealed by the beam and the lower part of the gap 5 between the right side surface and the left side surface is sealed by the sealing member 26. This makes it possible to reduce the amount of combustion exhaust gas that does not pass through the catalyst layer and passes through the gap between the catalyst 10 blocks. As long as the gap between the right side surface of one frame-shaped case and the left side surface of another frame-shaped case can be sealed, instead of attaching the sealing member to the bottom of the right side of the frame-shaped case, the 15 sealing member can be attached to the bottom of the left side of the frame-shaped case. The length and width of the sealing member can be set as appropriate according to the distance between adjacent beams and the size of the gap between the right side surface 20 and the left side surface of the adjacent catalyst blocks so as to suppress the slip-through of the combustion exhaust gas, respectively. If the catalyst block is bridged so that the right side surface or left side surface is parallel to the beam, 25 the sealing member can be attached to the lower portion of the front surface or rear surface of the frame-shaped case. The shape of the sealing member is not particularly limited as long as it can seal the combustion exhaust gas, and the sealing member 30 may be, for example, a flat plate or an L-shaped plate (angle material or the like). 20
[0042] In the drawings, the first diversion member 31 is mounted by screwing to the first suspending equipment so as to occlude the gap between the front surface and the rear surface of the adjacent catalyst blocks from above. The first diversion member 5 comprises a first top plate portion 34 having a hole 35 through which a bolt can pass. The first top plate portion is not limited by its shape as long as it can divert the combustion exhaust gas and lead it to the inlet port of the catalyst block. For example, it 10 may be a flat plate as shown in FIG. 5, an angle plate, or another shape. The first diversion member may have a handle on the upper surface side of the first top plate portion for convenience in removal. The direct or indirect mounting of the first diversion 15 member to the catalyst block may be performed by, for example, inserting into the gap between the catalyst blocks (insertion) or the like, instead of screwing to the first suspending equipment. It is preferable that the first diversion member is mounted after the 20 catalyst block is installed at a predetermined position on the beam.
[0043] In the drawings, the second diversion member 32 is mounted by being inserted into a gap between the right side surface and the left side surface of 25 adjacent catalyst blocks so as to occlude the gap between the right side surface and the left side surface of the adjacent catalyst blocks from above. The second diversion member is not limited by its shape as long as it can divert the combustion exhaust 30 gas and lead it to the inlet port of the catalyst block. For example, the second diversion member may
21
be a member having a T-shaped cross section comprising a flat second top plate portion 36 and an insertion portion 37 as shown in FIG. 6, may be a member having a coping-shaped cross section comprising a mountain-shaped second top plate portion and an insertion 5 portion, or may be a member having other shapes. The insertion portion in the second diversion member is a portion that can be inserted into the gap between the right side surface and the left side surface. The insertion portion is usually flat plate-shaped. The 10 insertion portion may be corrugated or hook-shaped in order to prevent it from coming out of the gap. The insertion portion 37 may be made shorter than the length of the second top plate portion or may be provided with a missing for circumventing the spacer 15 member, so as not to collide with the spacer member 25. The second diversion member may have a handle on the upper surface side of the second top plate portion for convenience in removal. The direct or indirect mounting of the second diversion member to the 20 catalyst block is not limited to the insertion, and may be appropriately performed by, for example, screwing with a screw, welding, or the like. The mounting of the second diversion member can be performed before or after installing the catalyst 25 block in a predetermined position on the beam.
[0044] When the first diversion member and the second diversion member are mounted, the end portion of the first diversion member and the end portion of the second diversion member may overlap each other. For 30 example, when the second diversion member is mounted by insertion and the first diversion member is screwed 22
so that the end portion of the first diversion member overlaps the end portion of the second diversion member, the second diversion member is held down by the first diversion member and can be firmly fixed.

We Claim:
1. A catalytic reactor, comprising
a reactor duct which allows a combustion exhaust gas 5 to flow in a vertical downflow,
at least two beams,
a catalyst block comprising a frame-shaped case and a catalyst unit housed in the frame-shaped case,
a first diversion member and 10
a second diversion member,
wherein the beam is horizontally provided inside the reactor duct,
the frame-shaped case has a cuboid or cubic shape,
the catalyst block is bridged between two of the beams 15 to be supported by the two beams,
the catalyst blocks are adjacently laid side by side in the reactor duct so that a front surface of the frame-shaped case and a rear surface of the adjacent frame-shaped case face each other and a right side 20 surface of the frame-shaped case and a left side surface of the adjacent frame-shaped case face each other,
the frame-shaped case has a stopper member attached to the upper part of the front surface and / or the 25 rear surface, and a spacer member attached to the right side surface and / or the left side surface,
the first diversion member is mounted so as to occlude a gap between the front surface and the rear surface of the adjacent catalyst blocks from above, and 30
the second diversion member is mounted so as to occlude a gap between the right side surface and the 27
left side surface of the adjacent catalyst blocks from above.
2. A catalytic reactor, comprising
a reactor duct which allows a combustion exhaust gas 5 to flow in a vertical downflow,
at least two beams,
a catalyst block comprising a frame-shaped case and a catalyst unit housed in the frame-shaped case,
a first diversion member and 10
a second diversion member,
wherein the beam is horizontally provided inside the reactor duct,
the frame-shaped case has a cuboid or cubic shape,
the catalyst block is bridged between two of the beams 15 to be supported by the two beams,
the catalyst blocks are adjacently laid side by side in the reactor duct so that a front surface of the frame-shaped case and a rear surface of the adjacent frame-shaped case face each other and a right side 20 surface of the frame-shaped case and a left side surface of the adjacent frame-shaped case face each other,
the frame-shaped case has a first suspending equipment attached to the upper part of the front surface and / 25 or the rear surface, a second suspending equipment attached to the upper part of the rear surface and / or the front surface, and a spacer member attached to the right side surface and / or the left side surface,
the first diversion member is mounted so as to occlude 30 a gap between the front surface and the rear surface of the adjacent catalyst blocks from above, and 28
the second diversion member is mounted so as to occlude a gap between the right side surface and the left side surface of the adjacent catalyst blocks from above.
5
3. The vertical downflow type catalytic reactor according to claim 1 or 2, wherein the frame-shaped case further has a sealing member attached so as to seal the lower part between the adjacent catalyst blocks and between the two beams. 10
4. A catalyst block used in the catalytic reactor described in claim 1, comprising a frame-shaped case and a catalyst unit housed in the frame-shaped case, wherein the frame-shaped case has a cuboid or cubic 15 shape, and the frame-shaped case has a stopper member attached to the upper part of the front surface and / or the rear surface, and a spacer member attached to the right side surface and / or the left side surface.
20
5. The catalyst block according to claim 4, wherein the stopper member has a screwed portion.
6. A catalyst block used in the catalytic reactor described in claim 2, comprising a frame-shaped case 25 and a catalyst unit housed in the frame-shaped case, wherein the frame-shaped case has a cuboid or cubic shape, and the frame-shaped case has a first suspending equipment attached to the upper part of the front surface and / or the rear surface, a second 30 suspending equipment attached to the upper part of the rear surface and / or the front surface, and a 29
spacer member attached to the right side surface and / or the left side surface.
7. The catalyst block according to claim 6, wherein the first suspending equipment has a screwed portion. 5
8. The catalyst block according to any one of claims 4 to 7, wherein the frame-shaped case further has a sealing member attached so as to seal the lower part between the adjacent catalyst blocks and between the 10 two beams.
9. The catalyst block according to any one of claims 4 to 8, wherein the frame-shaped case further has a second diversion member attached so as to occlude a 15 gap between the right side surface and the left side surface of the adjacent catalyst blocks from above.
30