JP3917350B2 - Manufacturing method and manufacturing apparatus of plate catalyst - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate-shaped catalyst manufacturing method and manufacturing apparatus, and more particularly to a plate-shaped catalyst manufacturing apparatus and manufacturing method on which a catalyst for removing nitrogen oxides and the like in exhaust gas is supported.
[0002]
[Prior art]
As a method for removing nitrogen oxides emitted from boilers for thermal power generation and various factories, an ammonia catalytic reduction method is generally widely used. The nitrogen oxide removal catalyst (hereinafter referred to as denitration catalyst) used in this method is formed into a plate shape, honeycomb shape, granular shape, etc., and the denitration catalyst has excellent denitration performance and combustion. Properties such as being less likely to be worn by dust in the exhaust gas and being less pressure loss when the exhaust gas passes through are required. In recent years, in order to reduce the pressure loss, a plate catalyst having a surface parallel to the flow direction of the exhaust gas and having less clogging of dust in the combustion exhaust gas is often used. The plate-like catalyst uses a woven fabric such as metal, glass fiber, or ceramic fiber as a strength member.
[0003]
FIG. 2 is an explanatory view of a conventional plate catalyst production apparatus capable of mass-producing the plate catalyst. In FIG. 2, this manufacturing apparatus includes a pair of upper rotating roll 4 and lower rotating roll 4A for applying the catalyst paste 2 to the substrate 1 by pressure, and when the substrate 1 passes through the rotating rolls 4 and 4A. The upper feeding device 5 and the upper winding device 6 and the lower adhesion prevention, which are arranged so as to be in contact with the respective surfaces of the rotary rolls 4 and 4A via the upper adhesion prevention sheet 3 and the lower adhesion prevention sheet 3A, respectively. A lower feeding device 5A and a lower winding device 6A of the sheet 3A are provided.
In such an apparatus, the substrate 1 supplied with the catalyst paste 2 passes between the rotating rolls 4 and 4A. At that time, the substrate 1 is fed out from the feeding devices 5 and 5A arranged up and down. The catalyst paste 2 passes through the adhesion prevention sheets 3 and 3A in contact with the surfaces of the rolls 4 and 4A, respectively, and the catalyst paste 2 is pressure-applied in the eyes of the substrate 1 to form a catalyst body 12 having a predetermined plate thickness. . The adhesion preventing sheets 3 and 3A that have contacted the substrate 1 and passed through the rotating rolls 4 and 4A are respectively wound and collected by the upper winding device 6 and the lower winding device 6A.
[0004]
The adhesion preventing sheets 3 and 3A are used to prevent the catalyst pace 2 having high adhesiveness from adhering to the surface of the roll when passing through the rotating rolls 4 and 4A in order to prevent the substrate 1 from falling off. It is done.
However, since the adhesion preventing sheets 3 and 3A can be used only once, and the used adhesion preventing sheets 3 and 3A wound up by the winding device are disposed as industrial waste, from the viewpoint of resources and the environment. There has been a strong demand to minimize the use of anti-adhesion sheets.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems of the prior art and to produce a plate-like catalyst capable of reducing the amount of the adhesion preventing sheet while preventing the catalyst paste from adhering to the rotating roll during pressure application. And providing a manufacturing apparatus.
[0006]
[Means for Solving the Problems]
As a result of intensive studies on the above problems, the inventors of the present invention heated one roll of a pair of rotating rolls to prevent the catalyst paste from adhering to the heated roll surface and cooled the other roll. Thus, the inventors have found that the above-mentioned problems can be achieved by maintaining the high adhesiveness of the catalyst paste and ensuring the same pressure-applicability and the like as in the prior art, and have reached the present invention.
That is, the invention claimed in the present application is as follows.
[0007]
(1) In a method for manufacturing a plate catalyst in which a substrate supplied with a catalyst paste is passed between a pair of rotating rolls and applied by pressure bonding, a temperature at which the catalyst paste prevents adhesion of one roll surface of the rotating rolls And the other rotating roll surface is cooled, and the substrate supplied with the catalyst paste is passed through the adhesion preventing sheet so as to be in contact with the cooled roll surface. Production method.
(2) The plate shape according to (1), wherein the catalyst paste contains at least one of Ti, Mo and V, and the temperature of the heated roll surface is in the range of 120 to 180 ° C. A method for producing a catalyst.
[0008]
(3) In the apparatus for manufacturing a plate-like catalyst provided with a pair of rotating rolls for pressure-coating and applying the catalyst paste to the substrate, one of the rotating rolls is provided with heating means for heating the surface of the roll, and the other rotating roll Provided with cooling means for cooling the surface of the roll, and further provided with an anti-adhesion sheet feeding device and a winding device in the upstream and downstream of the other rotating roll, and the substrate to which the catalyst paste is supplied is An apparatus for producing a plate catalyst, characterized in that, when passing through the roll, the roll is provided with the cooling means and is in contact with the adhesion preventing sheet.
(3) The apparatus for producing a plate catalyst according to (3), wherein a peeling means for peeling off the catalyst paste attached to the roll surface is provided on the roll surface provided with the heating means.
[0009]
[Action]
In the present invention, a plate-shaped catalyst having a predetermined plate thickness is manufactured by pressure-applying the catalyst paste so that the catalyst paste enters the substrate when the catalyst paste is sent from the upstream side together with the substrate and passes through a pair of upper and lower rotating rolls. Is done.
In the present invention, since one roll of the pair of rotating rolls is a heating roll and the other roll is a cooling roll, when the catalyst paste on the substrate passes through the pair of upper and lower rotating rolls, Since a part of the water evaporates and the adhesiveness of the catalyst paste is lowered, the adhesion of the catalyst paste to the surface of the heating roll can be prevented without using an adhesion preventing sheet. On the other hand, since the surface of the other roll rotating in contact with the heating roll is adjusted to be cooled and kept at room temperature, the moisture of the catalyst paste in contact with the roll does not evaporate, and high adhesion can be maintained. The stretched state is maintained, and the applicability of the catalyst paste to the substrate is not hindered. Further, the adhesion of the highly adhesive catalyst paste to the cooling roll is prevented by the adhesion preventing sheet.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto.
FIG. 1 is an explanatory view of a plate-shaped catalyst manufacturing apparatus showing an embodiment of the present invention. 1 differs from FIG. 2 in that the lower adhesion prevention sheet 3A and the sheet 3A feeding device 5A and the winding device 6A are not installed, and cooling water is supplied to the upper rotating roll 4 to cool the surface. A cooling water supply port 10 and a cooling water outlet 11 are provided, a bar heater 7 for heating the surface is embedded in the lower rotating roll 4A, and a catalyst protruding from the substrate 1 on the surface of the lower rotating roll 4A That is, a scraper 8 for removing the paste and the catalyst paste adhered to the roll surface is installed.
The rod-shaped heater 7 is connected to a slip ring (not shown), and a terminal portion is provided on the entire circumference of the slip ring. The lower rotating roll 4A rotates together with the slip ring and is always electrically connected to the rod-shaped heater 7 by a power supply terminal. Is to be supplied.
[0011]
In such an apparatus, after supplying the catalyst paste 2 onto the substrate 1, the substrate 1 is inserted between the pair of rotating rolls 4, 4 </ b> A together with the upper adhesion preventing sheet 3 and is passed by rotation of these rolls. The catalyst paste 2 is applied to the substrate 1 by pressure to form a catalyst body 12. At this time, the substrate 1 is in direct contact with the lower rotating roll 4A. However, since the lower rotating roll 4A is heated by the rod heater 7, the adhesiveness of the catalyst paste in contact with the surface of the lower rotating roll 4A is reduced. Adhesion of the catalyst paste 2 to 4A on the roll surface is prevented. Even if a small amount of the catalyst paste 2 adheres to the heated rotating roll 4A, the attached catalyst paste 2 can be peeled off by a scraper 8 such as a blade provided in contact with the lower rotating roll 4A. Furthermore, the scraper 8 can peel off the catalyst paste protruding from the substrate after passing through the rotating roll.
[0012]
On the other hand, the catalyst paste 2 passing in contact with the upper rotating roll 4 is in a state in which the upper rotating roll 4 is cooled by cooling water, so that the high adhesiveness of the catalyst paste 2 is maintained on the roll surface and stretched. Therefore, the catalyst paste 2 can be efficiently pressure-applied to the substrate, and the highly adhesive catalyst paste 2 is in contact with the upper rotating roll 4 via the upper adhesion preventing sheet 3, so that the upper rotating roll 4 is prevented from adhering.
In this way, the catalyst paste 2 is pressure-applied to the substrate 1 and the catalyst body 12 is cut, molded, dried, fired, and the like by a known method to form a plate catalyst.
In the above embodiment, the supply of the adhesion preventing sheet has been described with respect to the example in which the feeding device and the winding device are provided before and after the rotating roll. However, the adhesion preventing sheet is supplied to one rotating roll and collected. If it exists, it is not limited to the said apparatus.
[0013]
In the present invention, the temperature of the rotating roll to be heated is preferably selected as appropriate depending on the type of the catalyst component and the properties of the paste. For example, in the case of a Ti, Mo, or V-based catalyst, the temperature is preferably in the range of 120 to 180 ° C, more preferably in the range of 120 to 160 ° C. The temperature of the rotating roll to be cooled is preferably maintained at room temperature from the adhesiveness of the catalyst paste, the coating property, the strength of the catalyst, and the like. The means for heating the rotating roll is not limited to the method of embedding the rod heater shown in FIG. 1, and other heating means may be employed. Further, the means for cooling the rotating roll is not limited to the method using cooling water, and other cooling means can be employed.
[0014]
As the substrate, a conventionally known expanded metal substrate, heat-resistant fiber woven fabric substrate, or the like is used. As the catalyst paste, for example, a paste prepared by adding alumina silicate fiber or the like to a mixture prepared by mixing titanium oxide, molybdenum oxide, vanadium oxide, etc. at a predetermined ratio, kneading and adjusting by adding water thereto is used. It is done. Further, as the adhesion preventing sheet, a conventionally known sheet such as a polyethylene sheet, a polyvinyl alcohol sheet, or paper is used.
[0015]
【The invention's effect】
According to the present invention, since one of the pair of rotating rolls is a heating roll, the catalyst paste can be prevented from adhering to the surface of the heating roll without using an adhesion preventing sheet, and therefore the amount of the adhesion preventing sheet used can be reduced. The amount of industrial waste can also be reduced. In addition, since the high adhesiveness of the catalyst paste in contact with the cooling roll is maintained, the adhesiveness of the catalyst paste to the substrate is not hindered.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an apparatus for producing a plate-like catalyst showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a conventional apparatus for producing a plate catalyst.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Board | substrate, 2 ... Catalyst paste, 3 ... Upper adhesion prevention sheet, 3A ... Lower adhesion prevention sheet, 4 ... Upper rotation roll, 4A ... Lower rotation roll, 5 ... Upper feeding apparatus, 5A ... Lower feeding apparatus, 6 ... Upper winding Take-up device, 6A ... lower winding device, 7 ... rod heater, 8 ... scraper, 10 ... cooling water inlet, 11 ... cooling water outlet, 12 ... catalyst body.

Claims (4)

In a manufacturing method of a plate-like catalyst in which a substrate supplied with a catalyst paste is passed between a pair of rotating rolls and applied by pressure bonding, one roll surface of the rotating roll is heated to a temperature at which the catalyst paste prevents adhesion. The other rotating roll surface is cooled, and the substrate supplied with the catalyst paste is passed through the adhesion preventing sheet so as to be in contact with the cooled roll surface. The plate catalyst according to claim 1, wherein the catalyst paste contains at least one of Ti, Mo, and V, and the temperature of the heated roll surface is in a range of 120 to 180 ° C. Method. In the apparatus for manufacturing a plate-like catalyst provided with a pair of rotating rolls for pressure-coating and applying a catalyst paste to a substrate, heating means for heating the roll surface is provided on one roll of the rotating roll, and the roll is provided on the other rotating roll. A cooling means for cooling the surface is provided, and an anti-adhesion sheet feeding device and a winding device are provided in the upstream and downstream of the other rotating roll, and the substrate supplied with the catalyst paste passes through the rotating roll. The plate-shaped catalyst manufacturing apparatus is characterized in that the roll provided with the cooling means is in contact with the anti-adhesion sheet through the adhesion preventing sheet. 4. The apparatus for producing a plate catalyst according to claim 3, wherein a peeling means for peeling off the catalyst paste attached to the roll surface is provided on a roll surface provided with the heating means.

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