JPH1128367A - Method for disassembling plate-like catalyst and disassembling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reuse useful metal substrate or catalytic substances of a used plate-like catalyst by parting the catalytic substances from a metal substrate by striking iron powder or iron balls to the surface of the plate-like catalyst in the case a plate-like catalyst comprising a metal substrate and catalytic substances deposited on the substrate is disassembled. SOLUTION: After a guide 2 to which a plate-like catalyst 1 is attached is transported to the inside of a booth 3, iron balls 11 supplied from an iron ball tank 7 through an iron ball hose 6 are struck to the surface of the plate-like catalyst 1 through a nozzle 4 installed in the booth 3 by compressed air 8 supplied through a compressed air hose 5. Consequently, the catalytic substances 12 are parted from the plate-like catalyst 1 and together with the iron balls 11, the substances are recovered in a hopper 9. The mixture 20 of the catalytic substances 12 and the iron balls 11 and recovered in the hopper 9 is transported on an electromagnetic conveyer 10 in which electric power is supplied to the electromagnets 19 and the iron balls 11 and the catalytic substances 12 are separated by reversing upside down of the electromagnetic conveyer while the electric communication to the electromagnetic conveyer 10 is kept as it is. The recovered catalytic substances 12 are used again for producing a plate-like catalyst.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dismantling method and a dismantling apparatus for a plate catalyst, and more particularly to a plate catalyst capable of efficiently separating and recovering a catalyst substance without deforming a metal substrate. The present invention relates to a dismantling method and a dismantling device.

[0002]

2. Description of the Related Art An ammonia catalytic reduction method is widely used as a method for removing nitrogen oxides in combustion exhaust gas discharged from a large-sized boiler for power generation. As a denitration catalyst, a plate-shaped, honeycomb-shaped, or granular-shaped catalyst is known.

One of the characteristics of this denitration catalyst is that it must be resistant to wear by dust. In addition, it is required that the denitration performance is of course low pressure loss. Therefore, in order to reduce the pressure loss when the exhaust gas passes through the catalyst layer, a plate-shaped denitration catalyst having a surface parallel to the flow direction of the exhaust gas and having less dust clogging (hereinafter, also referred to as a plate-shaped catalyst). Are often adopted. An example of the mode is shown in FIGS. FIG. 2 is a perspective view of a plate-shaped denitration catalyst, and FIG. 3 is an enlarged sectional view of a portion A in FIG. In the figure, the plate catalyst 1
Is a metal substrate 1 made of, for example, lath-processed metal lath.
3 has a denitration catalyst material 12 carried thereon. For example, a mountain shape (a) parallel to the gas flow direction is formed at predetermined intervals.

[0004] Even with such a denitration catalyst, the performance deteriorates over time, and when the reference performance is not reached, the whole or a part of the catalyst is replaced with a new one. The extracted used denitration catalyst is regenerated by washing with water or the extraction of active ingredients is performed, or industrial waste (hereinafter referred to as industrial waste)
Has been disposed of. Disassembly methods of used plate catalysts include, for example, a separation method using a concave and convex roller and a separation method using high-pressure water, in which the active component of the catalyst substance separated from the metal substrate is reused, and unnecessary substances are treated as industrial waste. Has been disposed of.

[0005]

In the above-mentioned prior art, the method using the concave and convex rollers cannot completely separate the metal substrate and the catalyst substance, or the metal substrate cannot be separated.
Since the chevron shape (a) as shown in FIG. 2 is crushed by the uneven roller, there is a problem that the substrate cannot be reused even though the catalyst substance can be recovered. Further, in the method using high-pressure water, there is a problem that separation of separated catalyst substance and water is not easy, and most of the used plate-like catalyst has been disposed of as industrial waste without being reused. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to separate a catalytic substance from a metal substrate in a plate catalyst, particularly a used plate catalyst, and to use a useful one of the metal substrate or the catalyst material. It is an object of the present invention to provide a dismantling method and a dismantling apparatus for a plate-like catalyst, which can reuse a catalyst.

[0007]

The invention claimed in this application to achieve the above object is as follows. (1) A method for dismantling a plate-like catalyst in which a catalytic substance is supported on a metal substrate, wherein the catalytic substance is separated from the metallic substrate by hitting an iron powder or an iron ball on the surface of the plate-like catalyst. Disassembly method of plate catalyst. (2) The diameter of the iron powder or iron ball is 0.1 mm to 2.0 mm
The method for dismantling a plate catalyst according to the above (1), wherein (3) The disassembly method of the plate-like catalyst according to the above (1) or (2), wherein a mixture of the catalyst substance and the iron powder or the iron balls separated from the metal substrate is separated using a magnetic force.

(4) A means for supporting and carrying the plate-shaped catalyst into and out of the booth, means for striking iron powder or iron balls on the surface of the plate-shaped catalyst carried into the booth, and A plate-like catalyst comprising: means for collecting a mixture of iron powder or iron balls and a catalyst substance separated from a catalyst substrate; and separating means for separating the collected iron powder or iron balls from the catalyst substance. Demolition equipment. (5) The disassembly device for a plate-like catalyst according to the above (4), wherein the separation means separates the iron powder or iron ball from the catalyst substance by switching presence or absence of a magnetic force.

In the present invention, an iron powder or an iron ball is hit on the surface of the plate-like catalyst, and the catalytic substance applied to the metal substrate is peeled off by the impact force. Iron powder or iron ball (hereinafter,
The particle diameter of the iron ball is simply 0.1 mm to 2.0 mm, more preferably 0.3 to 1.0 mm
It is. If the particle size is too large, the impact force will be too strong, causing the catalyst substrate to be deformed. On the other hand, if the particle size is too small, the impact force becomes too small, and it takes time to peel off the catalyst substance, which is inferior in practical use. The striking strength is appropriately selected. By selecting a predetermined impact force, damage to the substrate can be avoided. For example, the chevron shape (a) in FIG.
Is maintained in the shape before processing.

[0010] The separated catalyst material is collected in a hopper together with an iron ball. The recovered catalyst substance and the iron ball are separated by a separation device that uses, for example, switching of the presence or absence of a magnetic force.

[0011]

Next, the present invention will be described in more detail by way of examples. FIG. 1 is an explanatory view showing a configuration of a plate-shaped catalyst dismantling apparatus showing one embodiment of the present invention. In the figure, this device supports a plate-like catalyst 1 and
A guide 2 as a means for carrying the plate-shaped catalyst 1 into and out of the booth 3 by proceeding to; an iron ball tank 7 for storing iron balls 11; and a surface of the plate-shaped catalyst 1 carried into the booth 3 A nozzle 4 as means for blowing the iron ball 11 to the compressed air 8,
A hopper 9 as a means for recovering a mixture of the catalyst material 12 peeled off from the plate-like catalyst 1 and a recovered iron ball 11
It is mainly composed of a caterpillar-shaped electromagnet conveyor 10 having means for switching the energization of an electromagnet 19 as means for separating the catalyst material 12 from the catalyst material 12, a cyclone 14 for collecting floating powder in the booth 3, and a dust collector 15. In addition, a plurality of nozzles 4 are attached so that the iron balls 11 can be simultaneously sprayed on the entire width of the plate catalyst 1 in the height direction. In addition, 16 is an energization section of the electromagnet 19 in the electromagnet conveyor 10, and 17 is a blackout section.

In such a configuration, the guide 2 on which the plate catalyst 1 is mounted advances in the traveling direction 18 and carries the plate catalyst 1 into the booth 3. The nozzle 4 installed in the booth 3 stores an iron ball 11 stored in an iron ball tank 7 and supplied through an iron ball hose 6 into a compressed air hose 5.
Is sprayed on the surface of the plate-like catalyst 1 by compressed air 8 supplied through the air. The catalyst substance 12 separated from the plate-shaped catalyst 1 by blowing the iron ball 11 is
Together with the hopper 9. The mixture 20 of the catalyst substance 12 and the iron ball 11 collected in the hopper 9
Is carried out onto the caterpillar-shaped electromagnet conveyor 10 which is energized. At this time, the electromagnet conveyor 10 is turned upside down while being energized, so that the iron ball 11 and the catalyst substance 12 remaining attached to the electromagnet 19 are separated. The recovered catalyst substance 12 is used again as it is for the production of a plate-like catalyst, or only the active ingredient is recovered by melting or extraction and reused. The iron ball 11 reaches a power failure section 17 in which the energization of the electromagnet 19 is cut off with the rotation of the electromagnet conveyor 10, and after being collected here, it is returned to the iron ball tank 7 for circulating use.

The metal substrate 13 from which the catalytic substance 12 has been peeled off
Is carried out from the booth 3 by the guide 2 to the outside, and the surface holding the chevron shape (a) is coated with, for example, a slurry composed of a denitration catalyst component, and is regenerated into a plate-like catalyst. The suspended powder collected by the cyclone 14 and the dust collector 15 is similarly separated into the catalyst material 12 and the iron ball 11 by a device using an electromagnet (not shown).

According to this embodiment, the catalyst material is peeled from the catalyst substrate by hitting the iron powder or iron ball, and the mixture of the peeled catalyst material and the iron powder or iron ball is separated by using the presence or absence of a magnetic force. Therefore, the plate-shaped catalyst can be disassembled into a metal substrate and a catalyst substance and reused.

[0015]

According to the first aspect of the present invention, the catalyst material is peeled off from the metal substrate by hitting an iron powder or an iron ball on the surface of the plate-shaped catalyst, thereby removing the catalyst material in a dry manner. Since it can be performed, it is possible to regenerate the plate-like catalyst by reusing it without corroding the metal substrate. The recovered catalyst substance can be used as it is, or only the active ingredient can be reused. Therefore, resource saving and reduction of industrial waste can be achieved.

According to the invention of claim 2 of the present application, by setting the diameter of the iron powder or the iron ball to 0.1 mm to 2.0 mm, it is possible to deform the metal substrate, for example, without breaking the chevron shape. Only the catalytic material can be stripped. According to the invention of claim 3 of the present application, by separating the mixture of the catalyst material and the iron balls separated from the metal substrate by magnetic force, the separation accuracy is improved, and the mixing of the iron balls into the catalyst material is eliminated.

According to the invention as set forth in claim 4 of the present application, the disassembly device for the plate-like catalyst comprises: means for loading and unloading the plate-like catalyst;
By having a means for spraying an iron ball on the surface of the plate catalyst in the booth, a means for collecting a mixture of the sprayed iron ball and the separated catalyst substance, and a means for separating the recovered mixture, the plate catalyst can be dried in a dry manner. Can be dismantled, thereby preventing corrosion of the collected metal substrate and contamination of the catalyst component with impurities and effectively reusing each of them.

According to the invention of claim 5 of the present application, since the separating means separates the iron ball and the catalyst substance by switching the presence or absence of a magnetic force, the iron ball and the catalyst substance are almost completely separated. Each of them can be separated and recycled or recycled.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an apparatus for dismantling a plate catalyst according to one embodiment of the present invention.

FIG. 2 is a perspective view showing the shape of a plate catalyst.

FIG. 3 is a partially enlarged sectional view of FIG. 2;

[Explanation of symbols]

1 ... plate catalyst, 2 ... guide, 3 ... booth, 4 ... nozzle,
5 compressed air hose, 6 iron ball hose, 7 iron ball tank, 8 compressed air, 9 hopper, 10 electromagnet conveyor, 11 iron ball, 12 catalyst material, 13 metal substrate, 1
4 cyclone, 15 dust collector, 16 energized section, 17
... blackout section, 18 ... traveling direction, 19 ... electromagnet, 20 ... mixture of iron ball and catalytic material, b ... chevron shape.

Claims (5)

[Claims] 1. A method for disassembling a plate-like catalyst in which a catalytic substance is supported on a metal substrate, wherein the catalytic substance is separated from the metallic substrate by hitting an iron powder or an iron ball on the surface of the plate-like catalyst. Dismantling method of a plate catalyst. 2. The iron powder or iron ball has a diameter of 0.1 mm or more.
The method for dismantling a plate-like catalyst according to claim 1, wherein the thickness is 2.0 mm. 3. The method for dismantling a plate-like catalyst according to claim 1, wherein a mixture of the catalyst substance and the iron powder or the iron balls separated from the metal substrate is separated by using a magnetic force. 4. A means for supporting the plate-like catalyst and carrying it into and out of the booth, a means for striking iron powder or an iron ball on the surface of the plate-like catalyst carried into the booth, and Means for recovering a mixture of powder or iron balls and the catalyst substance separated from the catalyst substrate, and a plate-shaped catalyst characterized by having a separating means for separating the recovered iron powder or iron balls from the catalyst substance Demolition device. 5. The apparatus for dismantling a plate-like catalyst according to claim 4, wherein said separation means separates said iron powder or iron ball from a catalyst substance by switching presence or absence of a magnetic force.