JPS58196838A - Catalytic reactor - Google Patents

Abstract

PURPOSE:To prevent the damage of a warmth preserving material, by a method wherein a catalyst structure provided in a casing is engaged with a framework consisting of a pillar and a beam through a stopper and the warmth preserving material is provided to the inside of the aforementioned casing. CONSTITUTION:A catalyst layer 2 is accommodated in a casing 7 provided to the inside of a framework consisting of a pillar 4 and a receiving beam 5 while fixed to the center of the receiving beam 5 supported by the pillar 4 through a clamp 12 and protected by a warmth preserving material 3 lined to the casing 7. In addition, to a beam 6 attached to the upper side part of the catalyst layer 2 and the pillar 4, stoppers 8, 9 for preventing the rolling of the catalyst layer are provided so as to butt the end parts thereof. By this structure, the framework and the casing are thermally protected from a high temp. gas passing the catalyst layer 2 and troubles due to the generation of heat stress and the deterioration of a material can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catalytic reactor, and more particularly to a reactor structure in which a catalytic structure in a catalytic reactor for exhaust gas denitrification is held within a casing.

A conventional catalytic reactor for smoke denitrification has a catalyst structure (hereinafter referred to as catalyst 1-) at 5, as shown in FIGS. 1 and 2.
2 is filled in the casing of a reactor l through which exhaust gas flows.
The protrusions of the pillars 4 and support beams 5 are covered with kelsingua, the outside of which is surrounded by a heat insulating material 3, and the stopper 8 attached to the catalyst layer 2 and the beam 6 that allows the catalyst layer 2 to sway horizontally is supported.
and 9 are configured to prevent this.

In the above structure, since the catalyst layer 2 and the reactor 1 are equally exposed to the processing gas, there is no difference in thermal expansion between them.
There is no particular problem with the above structure, but the f1 degree of the process gas is high, such as in a gas turbine exhaust heat recovery boiler, and the exhaust gas temperature rises and falls rapidly due to startup methods such as diary start and stop. In the case of high frequency, the reactor structure with external heat insulation described above cannot withstand the thermal stress that occurs when reactor columns, beams, etc. are started and stopped, and general steel materials cannot be used at high temperatures. There are drawbacks such as being possible.

Furthermore, in order to simplify on-site assembly and construction (construction method), it is desirable to assemble the device as much as possible in the factory, and for this reason, a method is used in which the catalyst structure is divided into blocks for transportation in advance. Since a crane or the like is used to transport such blocks of catalyst structures, the external insulation type has the disadvantage of being weak in strength (and damaging the insulation material).

The purpose of the present invention is to eliminate the drawbacks of the prior art described above, reduce the influence of heat on the frame of reaction 4 when the temperature of the gas to be treated is high, and provide a catalytic reaction that does not cause damage to the heat insulating material. It is about providing the equipment.

The present invention provides a catalytic reactor that includes a frame made of columns and beams, a casing provided on the frame, and a catalyst structure provided inside the frame, in which the catalyst structure is attached to the frame. It is characterized in that it is locked via a stopper and that a heat insulating material is provided inside the casing.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 3 is an elevational sectional view of a denitration reactor showing an embodiment of the present invention, and FIG. 4 is an enlarged plan sectional view of a stopper portion thereof. In the figure, the catalyst layer 2 is housed in a casing 7 inside a frame consisting of columns 4 and support beams 5, and is fixed via a fixture 12 to the center of the support beam 5 supported by the columns 4. It is protected by a heat insulating material 3 lined with a casing 7. Further, the ends of the beams 6Vc attached to the upper part 8 of the catalyst Im2 and the pillars 4 are provided with stoppers 8 and 9 for preventing the catalyst layer from spreading laterally.

According to such a configuration, by providing the heat insulating material 3 inside the frame body and casing 7 that accommodate the catalyst 1-2, the frame body and the casing are thermally protected from high-temperature gas passing through the catalyst layer 2. This makes it possible to avoid problems caused by thermal stress, material deterioration, etc.

However, in this case, the catalyst 1-2 comes into contact with the process gas pressure, but the columns 4, beams 6, etc. of the reactor 1 do not come into contact with the process gas, so the catalyst layer 2 and the columns 4, beams 6, etc. of the reactor do not come into contact with the process gas. A difference in thermal elongation occurs between the members. In other words, the thermal elongation of the pillars 4, beams 6, and casing 7 is small, and the thermal elongation of the catalyst layer 2 is large.
When K is set on the top, a force due to thermal expansion is generated in the axial direction from stopper 8 to stopper 9 after the start of operation, and the anti-L5ts column,
There is a problem in that related parts such as beams are deformed and even destroyed. In addition, in order to prevent this, the gap between the stoppers 8 and 9 is set to almost 0 during the operation of the apparatus, so that when no thermal expansion occurs in the catalyst layer 2, such as when the apparatus is stopped, as shown in FIG. , a large gap is created between the catalyst 1-2 and the stoppers 8 and 9 attached to the beam 6, respectively, due to thermal expansion. In this state, if a horizontal force occurs due to an earthquake, etc., the catalyst +
@2 vc Horizontal acceleration is added and an impact force is applied to the stopper 9 attached to the beam, so the beam 6
Otherwise, the reactor members of the column 44 and the casing 7 may be deformed or destroyed.

FIG. 6 is an elevational sectional view of a reactor showing a preferred embodiment of the present invention that solves the above problems, and FIG. 7 is an enlarged plan sectional view of the stopper portion thereof.

The difference from the devices in Figures 3 and 4 is that the catalyst layer is divided into two layers, 2B and 2B, and both catalyst layers are 2A.

2B is fixed on the support beam 5 via fixing devices 13 and 14, and a gap corresponding to the horizontal thermal expansion (arrow X) of the catalyst layer due to the processing gas is created between both catalyst layers 2A and 2B. The thermal elongation of the catalyst 1-0 in the axial direction of the stopper portion was set to O.

In addition, as shown in FIG. 7, catalyst II 2 A (B
) has a T-shaped retaining portion 81 of the stopper 8 attached to the holder 6, and a groove-shaped engaging portion 91 of the stopper 9 attached to the rice cooker 6 that slidably fits into the engaging portion 81. By doing so, both stoppers engage s81 and 9 in the horizontal direction.
The hooks fit between 1 and support the catalyst layer 2A (B),
In response to vertical thermal elongation of the catalyst layer 2A (B), the catalyst layer 2A (B) can be slid vertically between the stopper retaining portions 81 and 91.

According to the catalyst layer fixing method and stopper structure described above,
The thermal elongation (X direction) of the catalyst layer due to the processing gas is
This is possible by allowing the heat to escape into the gap provided between the person and 2B, so no thermal expansion occurs in the axial direction at the stopper portion. In addition, since the stopper 8 added to the catalyst layer 2 and 2B and the stopper 9 attached to the beam 6 are hooked together, it is possible to prevent the catalyst layer 2 and 2B from rolling. Therefore, no force is generated in the axial direction of the stopper portion due to thermal expansion, and even if a horizontal force is generated due to an earthquake, no impact force is applied to the stopper 9 attached to the beam 6. Furthermore, regarding the upward thermal elongation of both catalysts 1-2 and 2B,
It is possible to slide between both stoppers 8 and 9.
This makes it possible to absorb thermal expansion or contraction in the vertical direction and support catalyst I- without any problems.

Therefore, according to this embodiment, there is a problem in the internal heat retention reactor structure, that is, thermal elongation between the catalyst layer and the columns 4, beams 6, etc. of the reactor, which occurs when only the catalyst 1- contacts the process gas. All problems caused by differences can be solved.

In the present invention, the stopper that locks the catalyst 1- and the beam (frame body) is not limited to the T-shaped member and the C-shaped member that fits vertically and slidably into the T-shaped member as in the above embodiment. Any structure is sufficient as long as the retaining portion is movable to absorb thermal elongation of the catalyst layer in the vertical direction and can be locked in the horizontal direction.

Fig. 8 is a partial perspective view showing another embodiment of the strut horn (part) used in the present invention, and Fig. 9 is a partial plan view thereof in the II-[X direction. Differences from the embodiment shown in Fig. 7. The point is that the catalyst r@2A (B) and the stoppers 8 and 9 respectively attached to the beam 6 are connected by a universal joint type using a cross-shaped bottle 10.

Even with such a structure, the catalyst layer 2 formed by the gas to be treated
It can adapt to thermal expansion and contraction in the horizontal direction (X direction) and the vertical direction (Y direction) of A (B), and can suitably support the horizontal force in the axial direction of both stoppers 8 and 9. can.

The reactor of the present invention is not limited to a denitrification reactor, but can be similarly applied to other reactors that process high-temperature gas.

As described above, according to the present invention, the thermal elongation in the axial direction of the horizontal force limiting stopper between the catalyst layer and the reactor member can be set to O,
In addition, by making the stopper retaining part slidable in the direction perpendicular to the stopper axis, it absorbs the horizontal force due to the difference in thermal expansion between the catalyst layer and the reactor members and the horizontal force during an earthquake. This makes it possible to prevent deformation and destruction that may occur in related parts such as columns and beams of the reactor.

[Brief explanation of the drawing]

Figure 1 shows an example of a conventional external heat retention type denitrification reactor. 2 is a partially enlarged plan sectional view showing the stopper portion of FIG. 1; FIG. 3 is a vertical sectional view showing an embodiment of the internal heat retention type denitration reactor of the present invention; 4 and 5 are enlarged plan sectional views of the stopper portion C) used in the apparatus shown in FIG. 3, respectively, and FIG. 6 is a vertical sectional view showing an internal heat retention type denitrification reactor according to an embodiment of the present invention. , FIG. 7 is a partially enlarged plan sectional view showing the bottom part of FIG. 6, FIG.
FIG. 9 is a sectional view in the [X-[ direction] of FIG. 1...Denitrification reactor, 2A, 2B...catalyst +@, 3.
...Heat insulation material, 4...Column, 6...Beam, 7...K/
8.9... Stopper, lO... Pin, X...
・Horizontal thermal elongation of the catalyst layer, Y... vertical thermal elongation of the catalyst layer, 81.91... engagement part of the strut. Agent Patent Attorney Takeshi Kawakita

Claims (1)

[Scope of Claims] (1) A catalytic reactor comprising a frame made of columns and beams, a casing provided on the frame, and a catalyst structure provided inside the frame, wherein the catalyst structure is locked to the frame via a stopper, and a heat insulating material is provided inside the casing. (2. The catalytic reactor according to claim 1, wherein the stopper locks the catalyst structure and the frame so that they can slide or rotate in the vertical direction. (3) The catalytic reactor according to claim 1 or 2, wherein the catalyst structure is divided into a reasonable number of pieces while maintaining a thermal expansion absorption space.