JPS62121638A - Catalyst apparatus - Google Patents

Abstract

PURPOSE:To prevent the shift of stacked blocks, by mutually connecting and fixing catalytic blocks to the protruded end parts thereof at gathering parts of the corners of a casing or frame by metal connection jigs. CONSTITUTION:A plurality of catalyst blocks 1 each having a square cross-section received in a catalyst unit 2 is fed in a catalyst container from the upper part thereof by a filling apparatus to be arranged on a catalyst receiving stand 3 at the predetermined position thereof. At this time, with respect to the lowermost catalyst blocks 1, the protruded end part 1a of each catalyst block 1 is fixed by the bolt 6 and a metal fixing jig 5 provided to the corner art catalyst receiving stand 3 in an erected state. The catalyst blocks 1 on and after the second stage are stacked on the catalyst blocks 1 of the lowermost stage and upper, lower left and right catalyst blocks 1 are fixed by matching and engaging metal connection jigs 4 with the corners of said blocks 1.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a flue gas denitrification device, particularly to a catalytic reactor with an internal heat retention structure, for starting a gas generation source.

This invention relates to a catalyst support structure that prevents the catalyst layer from falling over due to horizontal forces such as thermal stress caused by shutdown, earthquakes, and pressure caused by gas flow.

<Prior art and its problems> The structure of a catalytic reactor in a conventional internal heat insulation structure system is shown in FIGS. 6 to 9. The strength member 8 and the casing 9 are provided on the outside of the heat insulating layer 7, and the heat insulating layer 7 with a predetermined thickness is provided on the inner surface of the casing 9 so that the temperature is close to the outside temperature.

In order to facilitate transportation and filling of the catalyst, the catalyst is usually formed into a catalyst block 1 containing a plurality of units 2 of approximately 500 van square as shown in FIG. The catalyst is introduced into the reactor from the upper part using a filling device, and stacked sequentially from the lower part to form a catalyst layer to obtain a predetermined performance. In this case, when the catalyst layer is started up, as shown in Figs. 10 and 11, when gas passes through the catalyst layer, heat is absorbed by the catalyst. A large temperature difference occurs, and this thermal expansion difference causes a warp δ18 due to thermal deformation on the rear side in the height direction of the catalyst layer (FIG. 11). In other words, DSS (DailyStartS top
(Abbreviation) When starting up the operation, it is a short time of about 1 to 2 minutes, but when the gas temperature is around 400℃,
When catalyst block 1 is at room temperature, catalyst block 1
The temperature difference between the inlet side and the outlet side is 150 to 200°C, and as a result, the catalyst block 1 thermally expands. Also, as shown in Fig. 10 in plan view, since the central part of the catalyst layer is fixed, warpage δ due to thermal deformation at the central part and both ends.
18 occurs. On the other hand, when stopped, the thermal deformation is completely opposite to that when started. Absorbing such thermal deformation of the catalyst layer,
At the same time, it is very difficult to create a support structure that can withstand the horizontal force 15 that acts on the catalyst layer due to earthquakes or gas flow 19. Conventionally, this support structure consists of stacking catalyst blocks 1 as shown in Figure 8. In each case, the catalyst blocks 1 and 1 are fixed by welding 11 and the entire catalyst layer is integrated, or as shown in Fig. 9, a truss material 10 is provided inside the heat insulation layer and outside the catalyst layer. Truss material 10
A method is used in which the catalyst pedestal 6 and the uppermost catalyst block 1 are fixed by welding 11 so as to be able to withstand horizontal forces such as earthquakes. However, the former catalyst block 1 is welded 11
In the case of a plant that is frequently started and stopped, the welded part 11 is likely to crack due to thermal fatigue, and each time the catalyst block 1 is installed or replaced, the welded part 11 is removed and then welded again. As a result, the installation or replacement work of the catalyst block 1 is extremely complicated and difficult.

There is a problem that it takes several days to replace it. In addition, in the latter method of providing support by providing the truss material 10, the difference in heat absorption between the catalyst layer and the truss material 10 causes a time lag in thermal deformation between the catalyst layer and the truss material 10, making it impossible for the truss material 10 to follow the thermal deformation of the catalyst layer. figure,
There is a problem in that thermal stress is generated in either the catalyst layer or the truss material 10 or each other.

<Objective of the Invention> The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to prevent "slippage" of stacked catalyst blocks, and to prevent damage caused by thermal deformation of the catalyst layer that occurs during startup and shutdown. It is an object of the present invention to provide a structure in which a catalyst layer can be formed that is stable and strong against horizontal forces such as seismic force, and which can be followed without any trouble, and in which the catalyst block can be replaced very easily.

Summary of the Means for Accomplishing In short, the present invention achieves the above object by connecting each catalyst block with a separate connecting fitting and fixing fitting separate from the catalyst blocks and integrating the entire catalyst layer. It is something.

Example of implementation The first embodiment of the present invention is shown in FIGS. 1 and 2 below.

This will be explained using FIG. A catalyst block 1 having a quadrilateral cross section and containing a plurality of catalyst units 2 is carried from the upper part of the catalytic reactor by a filling device and placed at a predetermined position above the catalyst holder 6. At this time, regarding the lowermost catalyst block 1, as shown in FIG. 1a is fixed.

The second and subsequent stages of catalyst blocks 1 are stacked on top of the bottom stage, and are connected to the top by connecting fittings 4 having a U-shaped cross section.

It has a structure that fits into the corners of the lower, right and left catalyst blocks 1. As shown in Fig. 2, the structure is a U-shaped cross section with a tapered opening 20, and a tapered section is located approximately in the center of each of the plate-shaped arms 4α, 4b on both sides of the opening. A groove 21 is formed. At this time, the fitting portion of the connecting fitting 4 is tapered so that it will fit even if there is some gap between the catalyst blocks 1, 1.

Similarly, the 2nd and 6th stages, the 3rd and 4th stages, etc. are stacked one after another, and the four catalyst blocks 10 are stacked using the connecting fittings 4.
The corners of the frame are connected, and the entire catalyst layer is finally integrated by the connecting fittings 4.

According to the embodiment described above, when a horizontal force such as an earthquake force acts on the catalyst layer, a tensile force acts on one side of the catalyst block 1, and a compressive force acts on the other side, and the force is greatest particularly at the bottom. This compressive force is directly transmitted between the frames of the catalyst block 1 without being transmitted to the connecting fitting 4, and is transmitted to the lower pedestal B. −
Since the tensile force is applied by sandwiching and fastening the ends of the frame of the catalyst block 1 with the connecting fittings 4, the tensile force of the frame of the catalyst block 1 is transmitted to the connecting fittings 4 and then to the lower catalyst block 10 frame. In this way, the tensile force is sequentially transmitted to the lower side and then to the pedestal B by the lowermost fixing fitting 5, fixing bolt 6, and nut. Therefore, as long as the connecting fittings 4 and the fixing fittings 5 are on the sufficient side, the catalyst layer can maintain stable strength against horizontal forces. At the same time, it is possible to freely follow the thermal movement of the catalyst layer without generating thermal stress, even with respect to the deflection δ18 due to thermal deformation of the catalyst layer during startup and shutdown of the plant.

Embodiment 2 A second embodiment is shown in FIGS. 4 and 5. Catalyst block 1
Fig. 4 shows tapers and grooves provided in the portion of the connecting fitting 4 that is inserted into the catalyst block 10 frame to improve the fastening force and to improve the tightening force between the catalyst blocks 1 and 1. ．． It is designed to be easy to fit, taking into consideration the possibility of loose installation between the two.

Figure 5 shows a structure in which holes are provided in the frame of the connecting fitting 4 and the catalyst blocks 1, 1, and pins 13 are inserted into the holes to prevent the connecting fitting 4 from coming off due to vibrations of the reactor. .

<Effects of the Invention> By carrying out the present invention, displacement of the stacked catalyst blocks is prevented, and the deformation caused by thermal deformation of the catalyst layer that occurs when starting and stopping the plant can be followed without any problem. A stable and strong catalyst layer can be formed against horizontal forces caused by earthquake force, gas flow, etc. Therefore, stable operation can be provided even for plants that are frequently started and stopped. Furthermore, the initial installation and replacement work of the catalyst block becomes extremely simple, contributing to the shortening of the installation process.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a catalyst device showing the state of the connecting fitting and fixing fitting according to the present invention, FIG. 2 is a partial perspective view showing the state of use of the connecting fitting, and FIG. 3 is a side view of the fixing fitting. Fourth
The figure is a side view of the connecting fitting, FIG. 5 is a perspective view of the connecting fitting of the second embodiment, FIG. 6 is a front view of a conventional catalyst device, and FIG. 7 is a side view of the device shown in FIG. Figure 8 is a perspective view showing the assembled state of the catalyst block by conventional welding, Figure 9 is a perspective view of the catalyst support structure using truss materials, Figure 1D is a plan view showing thermal deformation of the catalyst layer, and Figure 11. is its side view. 1... Catalyst block 1a,... Extended end 2...
・Catalyst unit 3... Catalyst pedestal 4... Connecting fittings 4a, 4b... Plate arm portion 5... Fixing fittings
2o...Opening 21...Tapered groove Fig. 8

Claims (1)

[Claims] 1. In a device in which a plurality of catalyst units are assembled to form a catalyst block with a square cross section, and a plurality of these catalyst blocks are stacked and interconnected to form a catalyst layer, the casing of the catalyst block Alternatively, the upstream and downstream ends of the frame with respect to the gas flow are extended from the end face of the built-in catalyst to form extended ends, and the extended ends at each gathering point of the corner of the casing or frame are respectively The catalyst blocks are connected and fixed to each other using connecting fittings, and the bottom exposed end of the lowest catalyst block is tightened and fixed using bolts, fixing fittings, and nuts set up on the catalyst holder. Catalyst device. 2. Claim 1, characterized in that the connecting fitting is a metal fitting having a U-shaped cross section with a tapered opening, and a tapered groove is provided approximately at the center of the plate-like arm portions on both sides of the opening. Catalyst device as described. 3. Claim 1, characterized in that one or more pin holes are provided that communicate the plate-like arms of the connecting metal fittings, and the pins are inserted into the pin holes to prevent the connecting metal fittings from falling off. 2
Catalyst device as described in section.