JPS5851944A - Ceramic honeycomb structure - Google Patents

Abstract

PURPOSE:To enable the purification of a fluid in good efficiency at the peripheral wall of a fluid passage, by a method wherein a layer having a penetrating fluid passage of which the inlet port part is closed and a layer having a piercing fluid passage of which the outlet port part is closed are mutually arranged and the peripheral walls of said fluid passages are formed from an air permeable material. CONSTITUTION:Layers 17 of which fluid inlet ports 16 are closed are mutually arranged and layers 18 of which outlet ports 19 are closed are mutually arranged to form a structure wherein a fluid can not directly pass the outlet ports. The peripheral wall of each fluid passage is constituted from fluid permeable ceramic having fine gap pores and the fluid is advanced to the direction shown by an arrow from all positions and the fluid purified by filtering and collecting carbon fine particles at the peripheral wall is discharged from the outlet. Because the fluid is purified as described above and the filtering surface area is large, the collection of fine particles in the fluid is carried out certainly in good efficiency and the purified fluid is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic honeycomb structure, and more particularly to a ceramic honeycomb channel structure configured to purify fluid on the peripheral wall of a honeycomb fluid passage.

Ceramic honeycomb structures are lightweight, have wear resistance, heat resistance, and strength characteristics, and are therefore widely used as supports for automobile exhaust gas purification catalysts. It is suitable as a body for a dust collector, a sintering furnace, a degreasing furnace, and a purifying device for an incinerator.

Conventional. In the ceramic honeycomb structure of 1a, the fluid passage is a direct pipe with a through hole, and when the stiff groove structure is installed in the above device, the exhaust gas inflow direction and the through hole of the honeycomb structure are in the same direction. It is difficult to collect carbon particles in exhaust gas, and therefore, even if a honeycomb structure with small fluid passages is used, the efficiency of collecting carbon particles is poor. In addition, filtration using a ceramic plate or the like having minute air permeable pores other than the honeycomb structure has a small collection area and the pores are immediately sealed by the carbon particles, making it unsuitable for practical use.

The present invention has been made in order to solve the above-mentioned drawbacks, and its gist is that layers in which the inlet hole of the penetrating fluid passage is not closed and layers in which the outlet hole is closed are alternately arranged. ，
The peripheral wall of the fluid passage is formed of a ceramic material having small air permeable pores, and the fluid is purified by the peripheral wall.

In the ceramic honeycomb horizontal structure of the present invention, as shown in the fluid flow side diagram in FIG.
The closed layer 18 is arranged so that the fluid cannot directly pass through the outlet hole, and the peripheral wall of this fluid passage has a seven-layer structure with minute holes that allow air permeability. Fluid advances in the direction of the arrow from all positions on the surrounding wall, filters and collects carbon particles, etc. at the surrounding wall, and the purified fluid is discharged from the outlet.

In this way, the fluid is purified by the filtration method, and because the traversing surface area is large, it is efficient in extracting or controlling particles etc. in the fluid.
The discharge of clean fluid had a sticky effect.

The honeycomb structure of the present invention has a roll-shaped perspective view shown in FIGS. 1A and B, and a stack-shaped perspective view shown in FIG. 2. There is no description of the outlet hole, but the closed first part of the fluid outlet hole.
It is an integrated tA body with layer and flow 14, the first artificial tank and the closed second layer alternately arranged and laid out. Figure 4 is the first part of Figure 2.
It is a partially cutaway oblique view of the inside of the structure with the layer and the second layer enlarged, and the flow of fluid is indicated by arrows. In the figure, 23 is a fluid side wall, and 24 is a closing wall. Although these walls may not have ventilation, like the filtering wall 25, they are more effective in purification efficiency and are more effective in terms of manufacturing efficiency. It's easy.

The porosity of the peripheral wall of this fluid passage varies depending on the above-mentioned purpose of use, but if it is 30% or more, it can be used in all mounting devices.

Moreover, the average pore diameter of the pores at this time is preferably 10 to 50 JErL. This pore diameter is 10μmlJ. If the pressure is lower than 50 μm, there is a risk that the powder in the fluid may pass through.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 PVB resin, plasticizer, and solvent were added to 45% by weight of ceramic raw material clay, 15% by weight of alumina gruel, and 40% by weight of talcum with an average particle size of 50μTtL, mixed to form a slurry, and this was mixed to a thickness using a doctor blade method. A 0.5 cylinder and a 0.3 ua green sheet were molded. This 0.3ycm thick sheet forms a corrugation wall with a pitch of 310%, and the thickness is 0.
．． Automatically glue the two sides together so that the 5rin sheet becomes the side outer wall, and then roll it up to form a honeycomb 1K shape! It was shaped like l2. At this time, the width of the side outer wall was made three times longer than the corrugation wall at each end, and these three end portions were bent and glued to the ends of the corrugation wall to form a closing wall.

After drying this, it was pumped at 300°C, and
After baking at 400℃ for 2 hours, it became 118φX as shown in Figure 1A.
The body was found in a 150L honeycomb groove. This structure is made of cordierite 2 with a porosity of 55% and an average pore diameter of 30μ.
It was Mgo.2Al203.5Si02. In the figure, 1 is a honeycomb body, 2 is a corrugated steel, and 3 is a closed nitrogen.

Example 2 Ceramic raw material clay 45 tons i. i%, alumina 15% by weight, talcum 40% by weight with an average particle size of 30 μm, PVB resin and plasticizer. Add a solvent, mix and knead to form a clay, and use a rolling roller with a cut-out device to form a clay with a thickness of 0.5 mm.
A passage wall with dimensions of rtrm, height of 3 m, and width of 3 m and a side wall of 0.7 m in thickness were formed into an integrated product, and this was rolled and bonded to form a honeycomb shape. At this time, the width of the side outer walls is set to be 37N1 longer at each end than the passage wall.
This three part was bent and glued to the end face of the passage wall to form a closing wall. After drying, the same method as in Example 1 was used. The honeycomb structure was fired under the conditions shown in FIG. 1B with a size of 118φX150Lm, and a cordierite material with a porosity of 5096 and an average pore diameter of 15 μm was obtained. In the figure, 5 indicates a honeycomb structure, 6 is a passage wall, and 7 is a closing wall.

Example 3 All of the raw materials used in Example 2 were made under the same conditions except that the average particle size of talc was 60 μm. As a clay shape by method. By extrusion molding, the passage wall thickness is 0.3ya and the height is 3Mn.
Dimensions of 3 cabinets: external size 110Xl10xl65L++o
A closed wall 1 is formed by molding a prismatic honeycomb of n size and gluing the fluid population holes and outlet holes alternately with green sheets as shown in Fig. 2.
3 was formed. This was fired in the same manner as in the above example,
100 holes with a porosity of 6096 and an average pore diameter of 45 μm
The body was made of cordierite honeycomb structure of 50L++un. In the figure, 11 indicates a honeycomb structure, 12 indicates a passage wall, and 1
3 is the closing wall.

Comparative Example The raw materials used in Example 2 were all the same proportions and conditions except that the average diameter of talc was 15 μm. It is made into a clay shape by extrusion molding, and the outside diameter is 13θφ side, and the through fluid passage is big 1.27.
mm, passage wall thickness 0.15 mm, fluid passage shape is square, formed into a honeycomb shape, fired to form a 118φ x 150 fluid passage with a porosity of 50% and an average pore diameter of 5 μnL
A Lna i7t rice honeycomb structure was obtained.

Above example. The honeycomb structure of the comparative example was installed between the engineered source source manifold and the muffler of a 2200cc four-cylinder diesel engine, and the engine was operated at 200 rpm.
The machine was rotated for 2 hours and the collection status of carbon fine powder was investigated. The measurement method is to measure the gas discharged from the exhaust pipe outlet using a smoke meter (Model DSM-10B, manufactured by Daycel Ichikiki Co., Ltd.), and the results are shown in Table F.

As is clear from the above table, the honeycomb structure of the present invention extracts fine carbon powder, etc. from exhaust gas with a collection rate of 5096 or more, and has a higher purification rate than the conventional direct honeycomb body with a collection rate of 196. It was shown to be effective.

In the above embodiments of the present invention, talc was used to provide breathability, but inorganic materials such as calcium carbonate, wood chips,
carbon. Organic substances such as plastics and fibers may be mixed. It is also possible to manufacture a honeycomb structure using a plate-like material such as woven cloth or urethane foam impregnated with ceramic slurry.

The honeycomb structure of the present invention purifies the fluid using a filtration method, and regenerates the clogged area of the honeycomb by heating and burning it with a heater or burner attached to the device, so the purification is highly reliable and effective. , the scope of its use will be expanded.

[Brief explanation of the drawing]

FIGS. 1A and 1B are oblique views of a cylindrical honeycomb structure according to an embodiment of the present invention, and FIG. 2 is a perspective view of a prismatic honeycomb structure according to another embodiment. 3 is a side view of fluid flow in the honeycomb structure shown in FIG. 2, and FIG. 4 is a partially cutaway perspective view of the inside of the structure, which is an enlarged version of FIG. 2. 1, 5, 11, 15, ... honeycomb structure, 2, 6,
12.23...Fluid passage wall, 3, 7, 13.17, 1
8.24...Closing wall, 16...Fluid artificial hole, 19.
...Fluid outlet hole, 25...filtration wall. 228-

Claims (1)

[Claims] In a cylindrical ceramic honeycomb structure having a plurality of through fluid passages, layers in which the inlet holes of the through fluid passages are closed and layers in which the outlet holes are closed are arranged alternately. The surrounding wall is made of ceramic with microscopic air permeable pores. A ceramic honeycomb structure characterized by purifying fluid on its surrounding wall.