JPS5935656B2 - Catalyst unit for exhaust gas denitrification equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catalyst unit for a flue gas denitrification device that processes combustion exhaust gas (hereinafter simply referred to as exhaust gas) containing nitrogen oxides (hereinafter referred to as NOx).

In order to decompose and remove NOx in exhaust gas, NH3, H
Recently, so-called dry flue gas denitrification equipment has been developed, in which a reducing agent such as 2S, H2, CO, CH4, etc. is added to the exhaust gas and brought into contact with a catalyst to reduce NOx to N2. However, the denitrification reactor in the conventional equipment described above generally has a structure in which the catalyst is simply put in and dropped into the reactor body, and as a result, the catalyst is dispersed due to falling, and the catalyst is damaged due to impact and collision. In addition, it is difficult to maintain the catalyst layer at a constant thickness, and it is time-consuming to add and remove the catalyst.

The present invention has been made to solve the above-mentioned drawbacks.
A porous body such as a wire mesh or a perforated metal plate is attached to the side openings of a cylindrical frame having wide area side openings on the inner side surface and the outer side surface to form a double porous cylinder body. At the same time, by filling this double-porous cylinder with a denitrification catalyst, and further providing a connecting cylinder at the bottom of the double-porous cylinder that can be stacked by fitting into the upper opening of another double-porous cylinder. ,
To protect the catalyst and reduce its dispersion due to falling and damage due to impact/collision, to maintain the catalyst layer at a constant thickness, and to be easy to handle as a uniformly weighted object and to maintain sufficient stability so that it can be stacked easily. The purpose of the present invention is to provide a catalyst unit for an exhaust gas denitrification device that can perform the following steps.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below based on embodiments shown in the drawings.

1 and 2 show a catalyst unit 1 in one embodiment of the present invention. Reference numeral 2 denotes a cylindrical frame body made of metal frame material, and this cylindrical frame body 2 has a wide area inner side opening 3 and side outer opening 4 on the inner side surface and the outer side surface. .

A double porous cylindrical body 6 is formed by firmly attaching a wire mesh 5 to these openings 3 and 4 by welding or the like. Furthermore, a short connecting tube 7 that can be freely stacked is attached to the lower part of the double-porous cylinder 6 by fitting into the upper opening of another double-porous cylinder. A catalyst inlet 8 is bored in the upper surface of the cylindrical frame 2,
A denitration catalyst 10 in the form of pellets, columns, Raschig rings, etc. is filled into the double porous cylinder through this catalyst inlet to form a catalyst unit 1 having a constant thickness and constant weight. Note that a hanging fitting (not shown) is fixed to the upper surface of the cylindrical frame 2. Also, a perforated metal plate may be used instead of the wire mesh. FIG. 3 shows another embodiment of the catalyst unit of the invention.

The catalyst unit 11 in this embodiment has a square cylindrical frame 1
A porous body 13 is attached to the side opening of the double-porous cylinder 14 to form a double-porous cylinder 14, and a denitrification catalyst 10 is filled in the double-porous cylinder. 15. The other configurations are the same as in the previous embodiment. The shape of the catalyst unit is cylindrical,
Instead of a square cylinder shape, it is also possible to use a polygonal cylinder shape.

The catalyst unit constructed as described above is housed and arranged within the reactor 16 as shown in FIG. This reactor body 16 has an exhaust gas inlet 17 at the lower side of one end and a clean gas outlet 18 at the upper side of the other end, and a blind plate 20 is provided above the exhaust gas passage in the reactor body 16. A hole is bored in this blind plate into which the connection cylinders 7 and 15 at the lower part of the catalyst unit can be fitted, and the connection cylinders 7 and 15 are fitted into the hole to form the catalyst unit 1,
Attach 11. Further, after another catalyst unit is successively stacked on top of this catalyst unit, a blind plate 21 is attached to the upper opening of the uppermost catalyst unit. Therefore, the exhaust gas introduced into the reactor main body 16 (to which a reducing agent has already been added) flows from the inside of the catalyst units 1, 11 to the outside, and at this time comes into contact with the catalyst to reduce NOx in the exhaust gas. is N2
The gas is decomposed and rendered harmless, and is discharged from the clean gas outlet 18. The reaction formula in this case is as follows, as an example, when ammonia is used as the reducing agent. Next, an example of the arrangement of the catalyst unit will be explained based on FIGS. 5 to 8.

First, FIG. 5 shows a case where the catalyst units 11 are arranged in the reactor main body 16 so that the corner portions of the catalyst units 11 are adjacent to each other.
22 is a guide column with a cross-shaped cross section, 23 is an exhaust gas flue, 24
is a clean gas flue.

Since the corners of the catalyst unit have frame materials, exhaust gas does not flow through them, so the frame materials at the corners are overlapped as shown in Figure 6 to effectively utilize the space inside the reactor body. It is desirable to arrange it as follows. Reference numeral 25 indicates a guide column having a substantially Z-shaped cross section, such as a Z-shaped steel.

Further, as shown in FIG. 7, the catalyst units may be arranged in a square arrangement, and as shown in FIG. 8, the catalyst units may be arranged in a triangular arrangement. Reference numeral 26 indicates a guide column having a substantially L-shaped cross section, such as made of angle iron.

Note that the arrangement of the catalyst units is not limited to the arrangement examples shown in FIGS. 5 to 8, and can be appropriately selected depending on the size and shape of the reactor body, the size and shape of the catalyst units, etc. As explained above, the catalyst unit for the exhaust gas denitrification apparatus of the present invention is extremely easy to handle as an object of equal weight, such as insertion and removal, and can be easily stacked while maintaining sufficient stability. In addition, the thickness of the catalyst layer can be maintained constant, and the catalyst is protected, so
Dispersion due to falling and damage due to impact/collision, which is the case with conventional products, is reduced. Furthermore, by combining a plurality of catalyst units, various arrangements are possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of a catalyst unit for an exhaust gas denitrification device of the present invention, FIG. 2 is a longitudinal cross-sectional view of the same, and FIG. 3 is a perspective view showing another embodiment of the catalyst unit. FIG. 4 is an explanatory diagram of a flue gas denitrification apparatus reactor having a catalyst unit of the present invention, and FIGS. 5 to 8 are explanatory diagrams showing examples of arrangement of the catalyst unit of the present invention. 1, 11... Catalyst unit, 2... Cylindrical frame, 3... Side inner surface opening, 4...
... Side external opening, 5 ... Wire mesh, 6, 14.
...Double porous cylinder, 7, 15... Connection pipe, 8... Catalyst inlet, 10... Denitrification catalyst, 12...・Square cylindrical frame, 13...
Porous body, 16...Reactor body, 17...
・Exhaust gas inlet, 18...Clean gas outlet, 20,
21...Blind board, 22, 25, 26...
Guide column, 23...Exhaust gas flue, 24...
・Clean gas flue.

Claims (1)

[Claims] 1 A porous body is attached to the side opening of a cylindrical frame having a wide area on the inner surface and outer surface of the side to form a double-porous cylinder, and this double-porous cylinder is A flue gas denitrification device, characterized in that a denitrification catalyst is filled inside the body, and a connecting cylinder is provided at the bottom of the double-porous cylinder so that it can be stacked freely by fitting into the upper opening of another double-porous cylinder. Catalyst unit for.