JP2002113371A - Device and method of manufacturing plate catalyst - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for manufacturing a plate catalyst, which is capable of reducing product defects even if a convex shaped plate catalyst is used. SOLUTION: In the device for manufacturing the plate like catalyst, which is provided with a pair of coating rollers 7 and 7' for rolling and coating the catalytic base plate 1 with a catalytic component, a pair of clamp rolls 3 and 3' for clamping the catalytic base plate 1 and provided with a break function 17, a vertically movable correction roll 2 for supporting the catalytic base plate 1 passed through the clamp roll at the under surface and an assistant roll 4 for supporting the catalytic base plate passed through the correction roll at the upper surface are successively provided in the pre-stage of the coating rollers 7 and 7'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for producing a plate-shaped catalyst, and more particularly to an apparatus and a method for producing a plate-shaped catalyst in which a catalyst component is applied to a metal substrate and formed into a plate. Further, the present invention relates to an apparatus and a method for manufacturing a plate-like catalyst capable of reducing product defects by applying a catalyst component after correcting the convex shape of the metal substrate.

[0002]

2. Description of the Related Art NOx in flue gas emitted from power plants, various factories, automobiles, and the like is a cause of photochemical smog and acid rain. As an effective method for removing NOx, for example, ammonia is used as a reducing agent. The selective catalytic reduction method has been widely adopted. As the denitration catalyst used at this time, for example, a catalyst in which titanium oxide is used as a carrier and an oxide such as vanadium, molybdenum, or tungsten is supported as an active component on the carrier is known. The shape of the denitration catalyst is, for example, plate-like, honeycomb-like, granular, or the like, but a plate-like catalyst is preferably used because it is easy to handle.

FIG. 4 is an explanatory view showing a conventional plate-shaped catalyst production apparatus disclosed in Japanese Patent Application Laid-Open No. 1-258745. In the figure, this apparatus has a pair of rotating rolls (hereinafter, referred to as coating rolls) 7 and 7 ',
For example, a denitration catalyst component is placed as a catalyst raw material 16 on an expanded metal 1 as a catalyst substrate, for example.
The catalyst body 8 is manufactured by supplying the catalyst raw material 16 to the expanded metal 1 by press-fitting it between the rotating coating rolls 7 and 7 ′. The catalyst body 8 is formed to have peaks and valleys at predetermined intervals as shown in FIG. 6, for example, and then cut into predetermined dimensions to form the catalyst elements 9. For example, as shown in FIG. 7, a predetermined number of the catalyst elements 9 are stacked, and stored in the unit frame 10 to form a catalyst block.

[0004]

By the way, the catalyst substrate, for example, an expanded metal, tends to have a convex shape as shown in FIG. 5 due to a reaction force at the time of processing.
This tendency becomes remarkable as the thickness of the substrate becomes thinner, and is a particular problem in a plate-shaped catalyst for processing a thinner substrate. That is, when the convex substrate is used as it is, the convex shape is not corrected even when the catalyst raw material is pressure-applied by the application roll, and the catalyst element after molding and cutting also has a convex shape. Then, when a large number of convex catalyst elements are sequentially stacked and filled in the unit frame, for example, as shown in FIG. 8, the width of the catalyst element 9 becomes smaller than the inner dimension of the unit frame 10 and falls off from the unit frame 10. Inconvenience occurs.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide an apparatus and a method for producing a plate-like catalyst capable of reducing product defects as much as possible even when a convex catalyst substrate is used. Is to provide.

[0006]

Means for Solving the Problems To solve the above problems, the present inventor, in order to reduce product defects due to the convex shape of the catalyst substrate, preliminarily coats the substrate with a catalyst component before applying the catalyst component to the substrate. Considering that it is necessary to correct the convex shape and return it to a flat plate shape, and as a result of intensive research, a brake that clamps a catalyst substrate sequentially in front of the coating roller of a plate-shaped catalyst manufacturing apparatus having a pair of coating rollers A pair of clamp rolls having functions, a straightening roll capable of moving up and down, supporting the catalyst substrate passing through the clamp roll on the lower surface, and an auxiliary roll supporting the catalyst substrate passing through the straightening roll on the upper surface are provided. The catalyst substrate before applying the catalyst component with the pair of application rollers, sequentially between the pair of clamp rolls,
Pass the lower surface of the straightening roll and the upper surface of the auxiliary roll,
By moving the straightening roll downward while braking the rotation of the clamp roll to apply a tension or an external force to the catalyst substrate and correcting the convex shape of the catalyst substrate by the tension or the external force, product defects are reduced as much as possible. And
The inventors have found that a plate-like catalyst can be efficiently produced, and have reached the present invention.

That is, the invention claimed in the present application is as follows. (1) In a plate-shaped catalyst manufacturing apparatus provided with a pair of application rollers for rolling-applying a catalyst component onto a catalyst substrate, a pair of clamps having a brake function for sequentially clamping the catalyst substrate in front of the application roller. A plate provided with a roll, a vertically movable straightening roll supporting the catalyst substrate passing through the clamp roll on the lower surface thereof, and an auxiliary roll supporting the catalyst substrate passing through the straightening roll on the upper surface. Equipment for the production of catalysts. (2) The apparatus for producing a plate-shaped catalyst according to the above (1), wherein an outer diameter of the straightening roll is 20 to 50 mmφ.

(3) A method for producing a plate-shaped catalyst in which a catalyst component and a catalyst component are supplied between a pair of rolling rollers to roll-coat the catalyst component on the catalyst substrate, wherein the catalyst component before the application of the catalyst component is provided. The substrate is sequentially passed between a pair of clamp rolls, the lower surface of the straightening roll and the upper surface of the auxiliary roll, and the straightening roll is moved downward while braking the rotation of the clamp roll to apply tension or external force to the catalyst substrate. And a step of correcting the convex shape of the catalyst substrate by the tension or the external force.

[0009]

Next, the present invention will be described in detail with reference to the drawings. 1, 2 and 3 are explanatory views showing the main parts of the device of the present invention, FIG. 1 is a perspective view, FIG. 2 is a side view,
FIG. 3 is a front view.

Referring to FIG. 1, this apparatus is a plate-shaped catalyst manufacturing apparatus having a pair of application rollers 7, 7 'for applying a catalyst component 16 to an expanded metal 1 as a catalyst substrate, in a stage preceding the application rollers 7, 7'. On the (upstream side), a pair of clamp rolls 3 and 3 ′ provided with a brake 17 for sequentially clamping the expanded metal 1 and the expanded metal 1 having passed through the clamp rolls 3 and 3 ′ are supported on the lower surface. A straightening roll 2 (see FIGS. 2 and 3) is provided so as to be vertically movable by one cylinder 5, and an auxiliary roll 4 for supporting the expanded metal 1 having passed through the straightening roll 2 on its upper surface. . The upper clamp roll 3 is supported by the second cylinder 6 so as to be able to move up and down, and is configured such that a gap with the lower clamp roll 3 'can be adjusted (see FIGS. 2 and 3).

In such a configuration, when loading the expanded metal 1 as a catalyst base material into the plate-shaped catalyst manufacturing apparatus, first, the upper clamp roll 3 is raised by the second cylinder 6 and the upper clamp roll 3 is lifted. The gap between the lower clamp roll 3 and the lower clamp roll 3 ′ is opened, the expanded metal 1 is passed between the clamp rolls 3 and 3 ′, and the straightening roll 2 set at the rising end by the first cylinder 5.
After passing along the lower surface of the auxiliary roll 4 and the upper surface of the auxiliary roll 4, the upper clamp roll 3 is lowered by the second cylinder 6 to move the expanded metal 1 down. Is clamped. In this state, when the rotation of the application rolls 7 and 7 ′ is started and the expanded metal 1 is pulled downstream (in the direction of the arrow 12 in FIG. 2), the brakes 17 of the pair of upper and lower clamp rolls 3 and 3 ′ are pulled. Is operated, tension acts on the expanded metal 1. When the straightening roll 2 is lowered by the first cylinder 5 in this state, an external force is applied to the expanded metal 1 in a direction opposite to the convex shape, the convex shape is corrected, and a flat substrate is formed. For example, a denitration catalyst component is placed as a catalyst component 16 on the expanded metal 1 whose convex portion has been corrected in this way, and in this state, the catalyst component 16 is passed through the coating rolls 7 and 7 ′. Is roll-coated on the expanded metal 1 to obtain a plate-like, for example, denitration catalyst 8.

According to this embodiment, a pair of clamp rolls 3 and 3 'having a brake function for clamping the catalyst substrate and the expanded metal 1 passing through the clamp rolls are provided before the coating rollers 7 and 7'. By providing a straightening roll 2 that can be moved up and down and supported on its lower surface, and an auxiliary roll 4 that supports the expanded metal 1 that has passed through the straightening roll 2 on its upper surface, the expanded metal 1 can be coated with the coating rolls 7 and 7. ′, The tension is applied to the expanded metal 1 by operating the brakes 17 of the clamp rolls 3, 3 ′, and the straightening roll 2 is moved down to the convex portion of the expanded metal 1. On the other hand, since an external force is applied in the opposite direction, the convex shape of the expanded metal 1 is corrected, and the expanded metal 1 becomes a flat expanded metal. Then, by applying the catalyst component 16 to the flat expanded metal 1, a flat catalyst can be prepared. Therefore, the occurrence of product defects based on the convex shape of the substrate can be reduced as much as possible.

In the present invention, as the catalyst substrate, for example, a metal substrate, preferably an expanded metal is used, but an inorganic fiber substrate or another substrate may be used. In the present invention, the smaller the diameter of the straightening roll, the greater the effect of correcting the convex shape of the substrate.
is preferably φ, more preferably 30 to 45 m
mφ. In the present invention, it is preferable to adjust the diameter of the straightening roll, the width of pressing down the first cylinder, and the braking force of the brake of the clamp roll according to the degree of convexity of the catalyst substrate.

[0014]

According to the invention described in claim 1 of the present application,
A flat substrate can be obtained by correcting the convex shape of the catalyst substrate before being introduced into the coating roller, so that product defects due to the convex shape of the catalyst substrate can be significantly reduced and a flat plate catalyst can be obtained. It can be manufactured efficiently. According to the invention described in claim 2 of the present application, in addition to the effects of the above invention, the effect of correcting the convex shape of the substrate is further increased. According to the invention as set forth in claim 3 of the present application, the catalyst component is roll-coated on the flat-shaped catalyst substrate having the corrected convex shape, thereby greatly reducing product defects due to the convex shape of the catalyst substrate. A flat plate-like catalyst can be efficiently produced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a plate-shaped catalyst manufacturing apparatus according to one embodiment of the present invention.

FIG. 2 is a side view showing a main part of a plate-shaped catalyst manufacturing apparatus according to one embodiment of the present invention.

FIG. 3 is a front view showing a main part of a plate-shaped catalyst manufacturing apparatus according to one embodiment of the present invention.

FIG. 4 is an explanatory view showing a conventional technique.

FIG. 5 is a perspective view showing a convex substrate.

FIG. 6 is a perspective view of a catalyst element.

FIG. 7 is a side view of the catalyst unit.

FIG. 8 is a side view of the catalyst unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Expanded metal (catalyst substrate), 2 ... Straightening roll, 3 ... Upper clamp roll, 3 '... Lower clamp roll,
4 auxiliary roll, 5 first cylinder, 6 second cylinder, 7 upper coating roll, 7 'lower coating roll, 8 catalyst body, 9 catalyst element, 10 unit frame, 12
... arrows indicating the direction of movement of the substrate, 13 ... movement of the correction roll, 14 ... movement of the upper clamp roll, 16 ... catalyst raw material,
17… Brake.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tokimasa Iwamoto 6-9 Takaracho, Kure-shi, Hiroshima Babcock-Hitachi Inside Kure Plant (72) Inventor Seigo Niioka 6-9 Takaracho, Kure-shi, Hiroshima Babcock-Hitachi Co., Ltd. 4G069 AA08 BA17 CA08 CA13 EA12 FA04 FB23 FB70 FB79

Claims (3)

[Claims] An apparatus for manufacturing a plate-shaped catalyst having a pair of application rollers for rolling-applying a catalyst component onto a catalyst substrate, wherein a pair of brake-equipped ones having a brake function are arranged in front of the application roller to sequentially clamp the catalyst substrate. The clamp roll of, supporting the catalyst substrate that has passed through the clamp roll on its lower surface,
An apparatus for manufacturing a plate-shaped catalyst, comprising: a straightening roll that can move up and down; and an auxiliary roll that supports a catalyst substrate having passed through the straightening roll on its upper surface. 2. An outer diameter of the straightening roll is 20 to 50 m.
2. The apparatus for producing a plate-shaped catalyst according to claim 1, wherein the diameter is mφ. 3. A method for producing a plate-shaped catalyst, wherein a catalyst component and a catalyst component are supplied between a pair of rolling rollers to roll-coat the catalyst component on the catalyst substrate, wherein the catalyst substrate is not coated with the catalyst component. Sequentially pass between a pair of clamp rolls, the lower surface of the straightening roll and the upper surface of the auxiliary roll, and apply a tension or an external force to the catalyst substrate by moving the straightening roll downward while braking the rotation of the clamp roll, A method for producing a plate-shaped catalyst, wherein the convex shape of the catalyst substrate is corrected by the tension or the external force.