JPS594180B2 - catalytic reactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catalytic reactor, and more particularly to a catalytic reactor suitable for processing dusty gases.

Conventionally, as a catalytic reaction device for treating exhaust gas with a high dust content, a parallel flow type reaction device in which plate-shaped, cylindrical, honeycomb-shaped, etc. catalysts are arranged parallel to a gas flow is known.

In such a device, there is a problem that, for example, tarinka generated in the boiler combustion device, or dust accumulated on the casing, internal stay, etc., falls onto the catalyst layer and locally blocks the catalyst layer.

As a countermeasure against this problem, a method of installing a wire mesh in front of the exhaust gas inflow side of the catalyst layer was proposed in a previous application (Japanese Patent Application No. 1983).
-50471).

In the above method, as shown in FIGS. 1 and 2, for example, after a reactor 1 is filled with catalyst blocks 2, a wire mesh support member 3 is installed in front of the exhaust gas inflow side of the reactor, and a wire mesh support member 3 is placed on this member. When attaching the wire mesh 4 and removing the catalyst, the above operation was performed in reverse.

However, such a method has the disadvantage that operations within the reactor during loading and unloading of the catalyst are extremely complicated.

It is an object of the present invention to provide a catalytic reactor which eliminates the above-described drawbacks of the prior art, allows easy installation of a wire mesh to prevent accumulated dust from falling, and facilitates loading and unloading of catalyst.

The present invention provides a catalytic reactor in which a parallel flow type catalyst for treating high dust content gas is incorporated in a frame, in which a plate-shaped porous body is kept at a certain distance from the catalyst inlet surface on the gas inflow side of the frame. It is characterized in that it is directly attached to the frame.

In a typical embodiment, the present invention further accommodates a catalyst unit containing a parallel flow type catalyst element in a frame, and maintains a certain distance from the gas inlet surface of the catalyst on the gas inlet side of the frame. A wire gauze is attached to the reactor, and the catalyst is charged into and extracted from the reactor together with the frame body to which the wire gauze is attached.

Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

FIG. 3 is a schematic diagram of a catalyst block showing an embodiment of the present invention.

The catalyst block 2 is composed of a plurality of catalyst units 5, a frame body (hereinafter referred to as an outer frame) 6 that accommodates these units, and a wire mesh 7 stretched over the gas inflow side of the outer frame 6. A gap is formed between the upper surface of the unit 5 and the wire mesh 7 stretched over the outer frame 6 to allow gas to flow so that accumulated dust falling onto the wire mesh does not block the catalyst.

Furthermore, as shown in FIG. 4, the catalyst unit 5 is composed of flat plate-shaped catalyst elements 8 and an inner frame 9 that accommodates these elements.

The size of the cross section of the catalyst block 2 in the direction perpendicular to the gas flow is usually about 1 to 2 m x 2 to 477 Z, but the supporting member of the wire mesh itself is replaced by the outer frame 6 as shown in Fig. 3. May be unnecessary or auxiliary.

If the structure shown in FIG. 3 is adopted, falling objects such as accumulated dust are captured on the wire mesh γ, and the catalyst unit 5 (
The metal mesh 7 can no longer fall onto the catalyst element 8) and cause blockage, and the wire mesh 7 can be attached to the outer frame 6 before the catalyst block 2 is installed in the reactor. The filling work is completed by simply installing the catalyst block 2 in the reactor 1, and the catalyst can be removed by simply removing the catalyst block 2 (the work involved in filling and removing the catalyst from the reactor is significantly reduced). decreases to

In the above embodiment, only a wire mesh has been described as a plate-like perforated plate for preventing dust from falling, but this is not limited to wire mesh, and as shown in FIG. Extended metal or grating as shown in FIG. 6 can be used.

Note that the catalyst element 8 is not limited to a plate-shaped catalyst, but may also be a honeycomb-shaped catalyst, a cylindrical catalyst, or the like.

As described above, according to the present invention, since the plate-like porous body for preventing dust from falling is directly attached to the catalyst structure in the reactor, it is possible not only to reliably prevent clogging of the catalyst due to falling accumulated dust, but also to prevent the catalyst from reacting. The work of filling and unloading the vessel is simplified, the catalyst can be replaced in a short time, and the support member of the net is replaced by a part of the catalyst structure, so there is no need for a support member. Excellent effects such as no

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional catalytic reactor equipped with a wire mesh for preventing dust from falling, Fig. 2 is a sectional view taken along the line ■-■, and Fig. 3 is a sectional view of a catalytic reactor of the present invention. FIG. 4 is a perspective view of a catalyst unit constituting the catalyst block of FIG. 3, and FIGS. 5 and 6 each show an embodiment of the net-like body used in the present invention. FIG. 1... Reactor casing, 2... Catalyst block, 6... Outer frame, 7... Wire mesh.

Claims (1)

[Claims] 1. In a catalytic reactor in which a parallel flow type catalyst for treating high dust-containing gas is incorporated in a frame, a plate-shaped porous body is placed on the gas inflow side of the frame at a certain distance from the catalyst inlet surface. A catalytic reactor characterized by being directly attached to.