JP4129814B2 - Catalytic reactor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a catalytic reaction apparatus, and more particularly to a seal plate that seals a gap between a side surface of a catalyst unit and an inner wall of a casing.
[0002]
[Prior art]
Nitrogen compounds, dioxins and the like are contained in exhaust gas discharged from combustion devices such as boilers and garbage incinerators. As an apparatus for treating these exhaust gases, there is known a catalyst reaction apparatus for purifying by reacting a nitrogen compound or dioxin in the exhaust gas with a heated catalyst. Conventionally, as this catalytic reaction apparatus, exhaust gas discharged from a combustion apparatus is guided into a casing, and after contacted with a catalyst of a catalyst unit provided in the casing for decomposition, the processing gas is discharged.
[0003]
By the way, in such a catalytic reaction apparatus, if there is a gap between the side surface of the catalyst unit and the inner wall of the casing, the exhaust gas is discharged through the gap. Therefore, for example, it has been proposed to attach a seal plate to the gap between the side surface of the catalyst unit and the inner wall of the casing (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 62-202323 [Problems to be solved by the invention]
By the way, in general, since the catalyst unit and the casing have a dimensional error or the like, variations occur in the size of the gap between them. Although it is necessary to adjust this dimensional variation with a seal plate, since it has not been considered in the past, adjustment is difficult and work efficiency is poor.
[0005]
An object of the present invention is to provide a seal plate whose dimensions can be easily adjusted.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a catalytic reaction apparatus of the present invention comprises a casing having a rectangular cross section through which exhaust gas flows, a rectangular parallelepiped catalyst unit disposed in a flow path in the casing, a side surface of the catalyst unit, A seal plate is provided to seal the gap between the inner walls of the casing. This seal plate is fixed to a rib plate whose edge on the casing side protrudes from the inner wall of the casing in a direction perpendicular to the gas flow by bolts and nuts. The edge is formed so as to contact the side surface of the catalyst unit, and either the edge on the casing side or the bolt hole formed in the rib plate is formed as a long hole in a direction perpendicular to the gas flow, The edge is formed by extending and bending the side surface of the catalyst unit in the gas flow direction.
[0007]
Here, when adjusting the dimensional variation of the gap between the side surface of the catalyst unit and the inner wall of the casing with the seal plate, adjustment in two directions, that is, the gas flow direction and the gas flow orthogonal direction is necessary. Therefore, the adjustment in the direction perpendicular to the gas flow is performed by sliding the seal plate using a long hole of a bolt hole that joins the seal plate and the rib plate. On the other hand, the gas flow direction is adjusted because the seal plate is simply brought into contact with the catalyst unit and is not fixed. Therefore, it is possible to easily adjust the dimensional variation only by determining the position of the seal plate by adjusting the coupling between the bolt and the nut. In this case, in order to ensure that the seal plate is in contact with the side surface of the catalyst unit, the length of the edge formed to extend in the gas flow direction needs to be set in advance in consideration of the adjustment allowance. is there.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is an overall configuration diagram of an embodiment of the catalytic reaction apparatus according to the present invention.
[0009]
As shown in the figure, the catalytic reaction apparatus of the present embodiment is arranged in a rectangular parallelepiped casing 3 through which exhaust gas containing NOx, dioxin, etc. discharged from a boiler, a garbage incinerator, etc. flows, and an exhaust gas passage. A catalyst unit 4, a seal plate 7 that seals a gap between the side surface of the catalyst unit 4 and the inner wall of the casing 3, an inlet duct 2 connected to the upper side surface of the casing 3, and an outlet duct 5 connected to the lower side surface The casing has a top lid 8 and a bottom lid 9.
[0010]
The inlet duct 2 and the outlet duct 5 are respectively connected to opposite side surfaces of the casing 3. The upper lid 8 of the casing is formed to be inclined downward from the upper end of the inlet duct 2, and the bottom lid 9 is formed to be inclined upward from the lower end of the outlet duct 5 in parallel with the upper lid 8. The catalyst unit 4 is disposed on a support stand (not shown) disposed in the casing 3, and is disposed horizontally at a substantially central height of the casing 3. The catalyst unit 4 is formed so that, for example, a rectangular parallelepiped container is uniformly filled with a catalyst and exhaust gas passes from above to below. The seal plate 7 is disposed so as to be inclined upward from the upper end of the side surface of the catalyst unit 4 to the inner wall of the facing casing 3.
[0011]
Here, an embodiment of the seal plate 7 which is a feature of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a part of the inside of a casing in which a seal plate is arranged, and FIG. 2 is a longitudinal sectional view of FIG. As shown in the figure, the seal plate 7 is fixed by a bolt 11a and a nut 11b to a plate-like rib plate 13 whose edge 7b on the casing 3 side protrudes from the inner wall of the casing 3 in the horizontal direction. The bolt hole 12a of the portion fixed by the bolt 11a and the nut 11b has one of the edge portion 7b and the rib plate 13 formed as a long hole in the horizontal direction. On the other hand, an edge portion on the catalyst unit side of the seal plate 7 is formed with an extending portion 7c that is bent by extending in the vertical direction (vertical direction) of the side surface of the catalyst unit 4, and the extending portion 7c is formed by the catalyst unit 4. It is formed in contact with the side surface. Note that a flat slope portion 7a is formed on the slope connecting the edge portion 7b and the extending portion 7c.
[0012]
Further, in the present embodiment, the catalyst unit filled with the catalyst layer is shown in one stage. However, the seal plate 7 can be arranged in each stage in the same manner as in the first stage even if the catalyst unit has two stages and three stages. .
[0013]
Next, the operation of the catalytic reaction apparatus configured as described above will be described. When the exhaust gas 1 is introduced into the casing 3 through the inlet duct 2, it is heated while flowing downward and becomes a high-temperature gas. The exhaust gas 1 is brought into contact with a catalyst heated to a predetermined temperature while passing through the catalyst unit. When nitrogen compounds, dioxins, etc. in the exhaust gas come into contact with the catalyst, they are removed from the exhaust gas by oxidative decomposition or the like. The processing gas 6 in which NOx, dioxin and the like are decomposed flows downward in the casing 3 and is discharged through the outlet duct 5.
[0014]
Next, adjustment of the arrangement of the seal plate, which is a feature of the present invention, will be described. Since the catalyst unit 4 and the casing 3 have a dimensional error, the dimension of the gap between the two varies. For this reason, it is necessary to adjust the dimension adjustment of the seal plate 7 individually.
[0015]
According to the seal plate 7 of the present embodiment, for example, by adjusting the horizontal position of the seal plate so that the extending portion 7c of the seal plate and the side surface of the catalyst unit 4 are in contact with each other, A seal plate can be disposed in the gap between the inner walls of the casing 3. That is, the edge portion 7b of the seal plate disposed on the upper surface of the rib plate 13 projecting horizontally from the inner wall of the casing 3 is horizontally adjusted within the adjustment range of the long hole formed in either the edge portion 7b or the rib plate 13. Move in the direction. When the extended portion 7c of the seal plate 7 comes into contact with the side surface of the catalyst unit 4, the rib plate 13 and the edge portion 7b of the seal plate 7 are fixed using the bolt 11a and the nut 11b. Thereby, even if the dimension of the gap between the side surface of the catalyst unit 4 and the inner wall of the casing 3 varies, it is only necessary to adjust the position in the horizontal direction, so that the dimension adjustment and the arrangement position of the seal plate 7 are facilitated.
[0016]
In this case, since the side surface of the catalyst unit 4 and the extending portion 7c of the seal plate are simply in contact with each other and are not fixed, the vertical dimension variation is absorbed and adjustment is not necessary. However, it is necessary to set the length (the amount of sag) in the vertical direction of the extending portion 7c to be longer (for example, about 100 mm) in consideration of the adjustment allowance.
[0017]
Next, for example, the following structure can be considered as a conventional seal plate. That is, the seal plate is composed of two parts, an upper part and a lower part, and the edge part on the casing side of the upper seal plate is fixed to a chevron rib extending vertically from the inner wall of the casing by a bolt and a nut, and one of the bolt holes The edge of the upper seal plate on the catalyst unit side is fixed to the edge of the lower seal plate on the casing side with bolts and nuts, and one of the bolt holes is elongated. A seal plate structure is considered in which a hole is formed so that it can be adjusted in the vertical direction, and the edge of the lower seal plate on the catalyst unit side extends in the vertical direction and is bent so that it contacts the side surface of the catalyst unit. It is done.
[0018]
In the case of such a seal plate structure, it is necessary to operate the vertical direction and the horizontal direction with bolts and nuts, respectively, and it is a work requiring skill to finely adjust and install the two bolts and nuts. In addition, it is necessary to produce a two-part seal plate, which causes problems such as a complicated structure.
[0019]
On the other hand, according to the seal plate structure of the present embodiment, the position can be adjusted only by operating one bolt or nut, so that the dimensional adjustment is simplified. Furthermore, since only one seal plate is required, the structure can be simplified and economical.
[0020]
【The invention's effect】
As described above, according to the seal plate of the present invention, it is easy to adjust the size of the gap between the side surface of the catalyst unit and the inner wall of the casing.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a catalytic reaction apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a part of the inside of a casing in which a seal plate according to an embodiment of the present invention is arranged.
FIG. 3 is a longitudinal sectional view of FIG. 1;
[Explanation of symbols]
1 exhaust gas 3 casing 4 catalyst unit 7 seal plate 11a bolt 11b nut 12a bolt hole 13 rib plate

Claims (1)

A casing having a rectangular cross section through which exhaust gas flows, a rectangular parallelepiped catalyst unit disposed in a flow path in the casing, and a seal plate for sealing a gap between a side surface of the catalyst unit and the inner wall of the casing, The seal plate is fixed by a bolt and a nut to a rib plate whose edge on the casing side protrudes from the inner wall of the casing in a direction perpendicular to the gas flow, and the edge on the catalyst unit side is on the side surface of the catalyst unit. One of the bolt holes formed in the casing side edge and the rib plate is formed as a long hole in a direction perpendicular to the gas flow, and the catalyst unit side edge is A catalytic reaction device formed by bending a side surface of a catalyst unit in the gas flow direction.

Images