JP2587422B2 - Internally heated vertical flow denitration reactor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a denitration reactor, and more particularly to a reactor structure suitable for preventing untreated gas leakage in an internal warming vertical flow reactor.

[Background of the Invention]

In an internal thermal denitration reactor, the internal components of the reactor (including the catalyst) are in direct contact with the high-temperature exhaust gas, and therefore have a large thermal expansion. However, the reactor casing is insulated by the internal thermal insulation, and is at room temperature. Almost no growth. Therefore, a difference in thermal elongation is inevitably generated between the two, and it is absolutely necessary to provide a gap between the two in the amount corresponding to the difference in thermal elongation.

However, if you leave this gap open,
Nitrogen oxide upstream of the denitration reactor (hereinafter abbreviated as NOx)
The exhaust gas containing high concentration leaks to the downstream side of the reactor without contacting the catalyst from this gap, and pushes up the NOx concentration at the outlet of the reactor. Therefore, various covers have been devised.

This prior art is shown in FIGS. FIG. 7 shows a horizontal sectional view of a vertical flow denitration reactor. Reactor casing 3
In order to support both ends of the catalyst receiving beam 1 in the longitudinal direction, appropriate portions of the side walls project outward in a box shape. The receiving beam 1 supported here is freely extended in the longitudinal direction by heat, but is restrained by the reactor casing 3 in a direction perpendicular to the longitudinal direction. The catalyst receivers 1 are connected to each other by a catalyst receiver 2 provided at right angles to the catalyst receivers. However, since the elongation also occurs in the receiving beam 2 due to the same heat, BB in FIG.
As shown in FIG. 10 which is an inverted sectional view of the line,
Has one end completely fixed by welding, while the other end has L
Receiving beam 1 and receiving beam 2 are mounted so that they can be stretched by thermal elongation only by riding on mold steel 6 and being restrained by plate 7.
There is a gap between them. The catalyst block 4
As shown in FIG. 8, it is installed on these receiving beams 1 and 2. However, as is clear from the figure, due to the clearance between the catalyst block 4 and the catalyst receiving beam 2 and the clearance between the internal heat insulating material 8 and the catalyst receiving beam 2 shown in FIG. There is a risk of leaking to the downstream side without passing through. For this reason, as shown in FIG. 9, a filler 5 is filled between the catalyst block 4 and the internal heat insulating material 8 and between the catalyst blocks 4 to prevent this.

In the prior art described above, (1) the filler must be filled in a wide range, and the cost and time are large.

(2) Enforcement over a wide range increases the probability of poor execution and the like, and tends to reduce reliability.

(3) Since the catalyst block and the packing are in direct contact,
When removing and replacing the catalyst block, it is necessary to remove the filler once and then refill it, so that the cost and time required for replacing the catalyst become large.

(4) The elastic force of the packing gradually decreases with frequent start / stop, and a crevice occurs between the catalyst block and the packing, causing a clique.

It has disadvantages such as.

[Object of the invention]

The object of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
Minimize the cost and time burden associated with filling
Another object of the present invention is to provide a highly reliable vertical flow denitration reactor.

[Summary of the Invention]

In short, the present invention provides a reactor casing, a heat insulating material provided on an inner wall of the reactor casing, a catalyst support member protruding from the reactor casing, and separating from the reactor casing supported by the catalyst support member. And a plurality of catalyst blocks placed on the catalyst receiver, and all of the space between the catalyst receiver and the catalyst block and between the catalyst blocks is made to be a metal touch. And is gas-sealed.

Next, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, in order to support a catalyst block 28, a plurality of catalyst support members 23 are provided inside the reactor casing 21, and for example, an L-shaped catalyst support auxiliary member 24 is welded between the catalyst support members 23. To form one frame.

On the other hand, as shown in FIG. 2, a plurality of catalyst blocks 28 are arranged and mounted on a catalyst bed 26 formed of a steel material in a frame shape, and a catalyst receiving beam 33 and a catalyst block 28 are integrally formed. To form a catalyst bed 26, which is the fourth
As shown in the figure, it is mounted on a frame composed of the above-mentioned catalyst support member 23 and catalyst support auxiliary member 24.

The catalyst receiving beam 33 of the catalyst bed 26 has an internal heat insulating material as shown in FIGS.
There is a gap between the two. Further, in order to absorb a difference in elongation due to heat, a sliding plate 25a,
25b has been installed. G in the figure indicates the flow direction of the exhaust gas.

In the internal warming type vertical flow type denitration reactor having such a configuration, the space between the catalyst receiving beam 33 and the catalyst block 28 is first gas-sealed with a metal touch as shown in FIG. As shown in FIG. 3, a seal member 27 is attached to the gap between the catalyst blocks 28, 28 so as to seal the gap, and similarly, gas sealing is performed by a metal touch.

Therefore, the exhaust gas g only flows through the inside of the catalyst block 28 or the flow path that flows outside the frame formed by the catalyst support member 23 and the catalyst support auxiliary member 24. Explaining the blockage of the flow outside the frame, the catalyst support auxiliary member 24 is joined to the catalyst support member 23, and a gas seal between the internal heat insulating material 30 and the catalyst receiving beam 33 is shown in FIG. As shown, a catalyst support auxiliary member 24 also serving as a seal plate is provided, extends into the internal heat insulating material 30, and blocks the flow outside the frame body with the catalyst support auxiliary member 24. In addition, slits are formed at regular intervals along the longitudinal direction of the catalyst support auxiliary member 24 to prevent cracks due to a difference in thermal expansion.

Further, since sliding plates 25a and 25b are respectively attached to the slide surfaces of the catalyst receiving beam 33 and the catalyst supporting member 23 of the catalyst bed 26, the thermal expansion due to the exhaust gas temperature is not restricted, and the sliding plates 25a and 25b are always fixed. Riding plate
Since the surfaces 25a and 25b are in surface contact, they are gas-sealed with a metal touch.

FIG. 6 is a view showing a modification of the catalyst support auxiliary member 24. In the case of this example, V-shaped or U-shaped bend portions 31 are provided at regular intervals, and when the catalyst support auxiliary member 24 is thermally expanded, it deforms as shown by a two-dot chain line to absorb a difference in elongation.

On the other hand, as for the gas seal, the seal plate 31 is attached to the V-shape or U-shape, and only one side of the V-shape is welded as shown in the figure, and the other side is free so that the expansion and contraction of the catalyst support member 24 is not restricted. I'm sorry. By attaching the seal plate 32 to the catalyst support member 24 in this manner, the slide surface is also gas-sealed with a metal touch.

〔The invention's effect〕

The present invention has the above-described structure, and a portion where gas leakage may occur can be gas-sealed with a metal touch. (1) Since the seal structure is simple, safety against the gas seal can be improved. .

(2) Easy to implement and economical.

(3) It has features such as being able to expand freely thermally with gas sealing even for frequent start / stop.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a horizontal sectional view of a reaction casing in a denitration reactor according to an embodiment of the present invention, FIG. 2 is a plan view showing a state where a catalyst block is filled, and FIG. 3 is FIG. AA view of FIG.
The figure is a partial vertical sectional view of the denitration reactor, and FIG. 5 is FIG.
FIG. 6 is an enlarged perspective view of a main part showing a modification of the catalyst support member. FIG. 7 is a horizontal cross-sectional view of a reaction casing in a conventional denitration reactor, FIG. 8 is a plan view showing a filled state of a catalyst block, FIG. 9 is a partial vertical cross-sectional view of the denitration reactor, and FIG. FIG. 7 is a BB view of FIG. 7. 21 ... reaction casing, 23 ... catalyst support member, 24 ... catalyst support auxiliary member, 25a, 25b ... sliding plate, 26 ... catalyst bed, 27 ... seal member, 28 ... catalyst block, 29 ... ... Seal plate.

Claims (1)

(57) [Claims] 1. A reactor casing, a heat insulating material provided on an inner wall of the reactor casing, a catalyst supporting member protruding from the reactor casing, and separated from the reactor casing supported by the catalyst supporting member. And a plurality of catalyst blocks placed on the catalyst receiver, and all of the space between the catalyst receiver and the catalyst block and between the catalyst blocks is made to be a metal touch. An internal warming vertical flow denitration reactor characterized by being gas-sealed.