JP4590941B2 - Method for manufacturing honeycomb-shaped element - Google Patents

Description

  The present invention relates to a method for supporting a slurry of a catalyst or an adsorbent on a honeycomb element substrate.

  Conventionally, as this type of loading method, the opening end is arranged up and down, the honeycomb substrate is immersed in the catalyst or adsorbent slurry to carry the catalyst or adsorbent, and the honeycomb substrate is heated and humidified. A method of removing excess slurry by ventilating the wind speed and time is known (see, for example, Patent Document 1).

  Hereinafter, the carrying method will be described with reference to FIG. 5, FIG. 6, and FIG.

  As shown in FIGS. 5 and 6, the honeycomb base material 101 is placed on the impregnation net 102, and the honeycomb base material 101 is immersed together with the impregnation net 102 in the impregnation tank 104 containing the slurry 103 of the catalyst or adsorbent. The honeycomb substrate 101 is pulled up after a predetermined time. In this state, there is a lot of excess slurry 106 in the ventilation path 105 of the honeycomb substrate 101, and it is necessary to remove this excess slurry 106. Therefore, the excess slurry 106 is removed by ventilation or suction from one opening end of the honeycomb substrate 101. Alternatively, a straight line perpendicular to the extension line passing through an arbitrary line on the extension line connecting the centers of both opening ends of the honeycomb base material 101 is a rotation axis of centrifugal separation, and the honeycomb base material 101 is centered on the rotation axis. The excess slurry 106 is separated by centrifugal force. The honeycomb base material 101 on which the slurry is supported in the above process is repeatedly dried, fired or impregnated with the slurry a plurality of times in the next process.

Next, as shown in FIG. 7, the honeycomb-shaped element 107 is sliced into a plurality of sheets so as to have a predetermined size to form a disk-shaped honeycomb-shaped element 108. At this time, the opening end 109 of the honeycomb-shaped element 107 is displaced due to the honeycomb lamination or is deformed by the impregnation network 102 during the impregnation, and at the same time, the amount of slurry supported is very large, and as a result, the amount supported is large. A few millimeters from the open end 109 are discarded as scrap 110 because the performance is not satisfied.
JP 2003-236392 A

  In such a conventional loading method, the slurry moves to the downstream side of the honeycomb base material in the surplus slurry removing step, so that the film thickness on the downstream side of the opening end portion of the honeycomb base material becomes relatively thick. There is a problem that variation in the amount of slurry carried in the thickness direction of the honeycomb element occurs, and it is required to reduce the variation in the amount of loading. Especially in the vicinity of the downstream opening end, the film thickness of the slurry becomes extremely large due to the surface tension, and the air passage of the honeycomb substrate is sealed or the pressure loss becomes very high. This phenomenon cannot be completely eliminated even by ventilation or centrifugal separation for removing excess slurry. In addition, from the opening end of the honeycomb substrate discarded as scrap to the upstream side of several millimeters or more, it has an effect of increasing the film thickness, leading to variations in the amount of support. This variation in the carrying amount is to narrow the ventilation path of the honeycomb-shaped element and increase the pressure loss. In addition, the honeycomb-shaped element is sliced into a plurality of sheets so as to have a predetermined size, and the disk-shaped honeycomb-shaped element In this case, the variation in the carrying amount becomes the variation in the performance of the product, and improvement is required.

  The present invention solves such a conventional problem, and can reduce the variation in the amount of catalyst or adsorbent supported in the thickness direction of the honeycomb-shaped element, and as a result, the performance of the product can be reduced. An object of the present invention is to provide a slurry loading method capable of reducing variations.

The present invention, after the honeycomb substrate was immersed in a slurry of catalyst or adsorbent, for excess slurry for the purpose of removing uniformly to the thickness direction of the honeycomb base material, to achieve the above object, the honeycomb substrate In the method for manufacturing a honeycomb-shaped element in which excess slurry adhering to the ventilation path is removed using centrifugal force, the extension passing through an arbitrary point on an extension line connecting the centers of both opening ends of the honeycomb substrate. A straight line perpendicular to the line is used as a rotation axis of the centrifugal separation, and a water repellent is applied to the opening end portion far from the rotation axis of the centrifugal separation.

  As a result, variation in the amount of slurry carried by the position in the thickness direction of the honeycomb substrate is reduced.As a result, when the honeycomb-shaped element is sliced into a plurality of predetermined dimensions to obtain a disk-shaped honeycomb-shaped element, As a result, it is possible to manufacture a honeycomb-shaped element with a small variation in the carrying amount and a small variation in performance.

According to the present invention, the excess slurry film formed by surface tension in the open mouth end of the honeycomb base material, no longer formed by applying a water repellent agent, in the removal of excess slurry in the centrifugal separator, A surplus slurry can easily move in the ventilation path, and the surplus slurry can be efficiently discharged to the outside of the honeycomb base material. Can be provided. In addition, the reduction in the variation in the carrying amount is a reduction in the variation in product performance, and it is possible to provide a method for manufacturing a honeycomb-shaped element with a small performance variation.

  In addition, the material yield is improved by reducing the volume of several millimeters from the open end of the honeycomb-like element that is discarded as scrap because it does not satisfy the predetermined performance, and a cost reduction effect can be expected.

The invention of claim 1, wherein the present invention, excess slurry adhering to the air passage of the honeycomb substrate, in the method for manufacturing a honeycomb-shaped element to be removed by utilizing the centrifugal force, the center of the two open ends of the honeycomb base material A straight line perpendicular to the extension line passing through an arbitrary point on the extension line connecting the two is used as a rotation axis of the centrifugal separation, and a water repellent is applied to the opening end portion far from the rotation axis of the centrifugal separation, It has the effect of avoiding deformation of the honeycomb substrate due to the wind pressure of the ventilation.

  In addition, the application of the water repellent to the opening end of the present invention is a little inside the honeycomb air passage so that the application of the water repellent does not significantly affect the opening end face or the reduction of the catalytic performance of the honeycomb from the opening end face. But it ’s okay.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

( Reference form 1)
As shown in FIGS. 1 and 2, the honeycomb substrate 1 impregnated with the catalyst or adsorbent slurry is ventilated from the upstream opening end 2 to the downstream opening end 3 and adheres to the wall in the ventilation path 4. The surplus slurry 5 is moved by wind pressure and blown out of the honeycomb substrate 1. In the honeycomb substrate 1 from which the excess slurry 5 has been removed, the excess slurry 5 has been excessively adhered to the downstream opening end 3 due to the surface tension in the past, but the honeycomb substrate 1 of the present invention coated with the water repellent 6 is used. Then, due to the effect of the water repellent 6, the slurry is cut off and the excess slurry 5 does not accumulate at the downstream opening end 3, and the excess slurry 5 easily moves on the inner wall surface of the ventilation path. It can be discharged outside the ventilation path. As a result, the amount of the catalyst or adsorbent supported on the honeycomb substrate becomes relatively uniform with less variation.

(Embodiment 1 )
FIG. 3 shows a process of applying the water repellent 6 to the honeycomb substrate 1, and spraying the water repellent spray 7 obliquely from above the honeycomb substrate 1, thereby allowing the water repellent 6 to flow through the honeycomb substrate 1. It can be efficiently applied only to the end portion without being applied to the inside. A straight line perpendicular to the extension line passing through an arbitrary point on the extension line connecting the centers of both opening ends of the honeycomb base material is used as the rotation axis of the centrifugal separation, and at the opening end portion far from the rotation axis of the centrifugal separation. A water repellent is applied. A surplus slurry can easily move in the ventilation path, and the surplus slurry can be efficiently discharged to the outside of the honeycomb base material. Can be provided. In addition, the reduction in the variation in the carrying amount is a reduction in the variation in product performance, and it is possible to provide a method for manufacturing a honeycomb-shaped element with a small performance variation.

(Reference Example 1) As a base paper, a paper sheet mainly composed of glass fiber was used, and a corrugator having a structure similar to that of corrugated board production was used to form a one-stage sheet. The single-stage sheet has a paper width of 155 mm, a pitch of 2.65 mm, and a height of 1.5 mm. The single-stage sheet was wound into a substantially cylindrical shape to produce a cylindrical honeycomb substrate 1 having an inner diameter of 63 mm, an outer diameter of 270 mm, and a thickness of 155 mm. Here, a base material obtained by corrugating papermaking was used, but it is clear that the same can be said for a cordierite base material processed by extrusion molding.

  3 g of a silicone resin-based water repellent 6 was sprayed on the entire surface of the downstream opening end 3 of the honeycomb substrate 1. At this time, if the water repellent agent 6 is applied to the deep part of the ventilation path of the honeycomb substrate 1, the slurry is not carried on that part, leading to a reduction in the performance of the product. However, if there is little application of the water repellent 6 and only the thick wall surface of the ventilation passage wall at the end of the opening, the water repellent effect is not sufficient and the product performance varies. Therefore, application to a depth of several millimeters is desirable.

  Next, the opening end portion was arranged in the vertical direction, and the honeycomb substrate 1 was placed on the impregnation net 102 and immersed in the slurry 103. As the slurry 103, an adsorbent mainly composed of zeolite was used. After immersion for about 5 minutes, the honeycomb base material 1 was pulled up together with the impregnation net 102, and moved up and down gently to remove the excess slurry 5, and then the excess slurry 5 was removed by air blow. The excess slurry 5 was removed by air blowing while moving an air nozzle attached to the actuator of the robot at a constant speed on the honeycomb substrate opening end.

  The honeycomb-shaped element 8 after air blowing was dried by ventilation, fired in a furnace after drying, and burned off organic components. Next, the slurry is impregnated for the second time, but the vertical direction of the honeycomb substrate is opposite to that of the first time, and the water repellent 6 is similarly applied to the opposite surface and dried by ventilation to produce the honeycomb element 8. did. Alternatively, the same effect can be expected even if the water repellent 6 is applied to both ends of the honeycomb substrate 1 before the first slurry impregnation.

  In order to confirm the variation in the carrying amount of the honeycomb element 8 in the thickness direction, the element was sliced to a width of 17 mm at the end of the element having a thickness of 155 mm except 4 mm from both ends and the weight was measured. FIG. 4 shows the measurement results.

  Depending on the presence or absence of the water-repellent treatment, a difference in the dry weight of the honeycomb-shaped element 8 is recognized between the upper, middle, and lower positions of the slice position. On the other hand, the honeycomb-shaped element 8 subjected to the water-repellent treatment is 12.8 g, the weight difference is reduced by 45%, and the application of the water-repellent agent has a positive influence on the weight variation of the honeycomb-shaped element 8 substrate. It is clear to give

  The present invention can be applied to all methods for manufacturing honeycomb-shaped elements, and industrially, a stable catalyst or adsorbent can be supported in a dehumidifying element, a humidifying element, a deodorizing element, or the like.

Explanatory drawing of the excess slurry removal of a honeycomb base material of reference form 1 Detailed view of ventilation path with water repellent applied to the open end of the honeycomb substrate Explanatory drawing of the coating method of the water repellent of Embodiment 1 of this invention Relationship between the presence / absence of water-repellent treatment at the end of Reference Example 1 and element weight Detailed view of ventilation path with water repellent applied to the open end of a conventional honeycomb substrate Detailed view of ventilation path of the same disk-shaped honeycomb substrate Explanatory drawing of the manufacturing method of the same disk-shaped honeycomb element

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Honeycomb base material 2 Upstream side opening edge part 3 Downstream side opening edge part 4 Ventilation path 5 Excess slurry 6 Water repellent agent 7 Water repellent spray 8 Honeycomb-like element 101 Honeycomb base material 102 Impregnation network 103 Slurry 104 Impregnation tank 105 Ventilation path 106 Excess slurry 107 Honeycomb element 108 Disc-shaped honeycomb element 109 Open end 110 Scrap

Claims (1)

In the method for manufacturing a honeycomb-shaped element in which excess slurry adhering to the ventilation path of the honeycomb base material is removed using centrifugal force, an arbitrary point on the extension line connecting the centers of both opening ends of the honeycomb base material is determined. A method for manufacturing a honeycomb-shaped element, characterized in that a straight line perpendicular to the extended line passing through is used as a rotation axis for centrifugal separation, and a water repellent is applied to an opening end far from the rotation axis for centrifugal separation.

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