Local strengthening method of honeycomb three-dimensional ceramic membrane and product thereof

Abstract

The invention provides a local strengthening method of a honeycomb three-dimensional ceramic membrane and a product thereof, and belongs to the technical field of preparation of honeycomb ceramic catalytic carriers. The local strengthening method comprises the following steps: carrying out local surface treatment on a blowback channel and a blowback end surface of a honeycomb three-dimensional ceramic membrane green body, and carrying out continuous hole plugging treatment on the outer edge of a supporting end surface of the honeycomb three-dimensional ceramic membrane green body; and drying and sintering the locally strengthened honeycomb three-dimensional ceramic membrane green body to obtain the honeycomb three-dimensional ceramic membrane. The local surface treatment is that inorganic paint is prepared into a coating or metallization treatment is carried out. According to the method, the local strength of the honeycomb three-dimensional ceramic membrane is improved in a manner of performing surface strengthening on the blowback end face of the honeycomb three-dimensional ceramic membrane and strengthening the contact supporting part of the honeycomb three-dimensional ceramic membrane, so that the honeycomb three-dimensional ceramic membrane can bear repeated purging regeneration of high-pressure air, and the high-temperature cavitation resistance of the honeycomb three-dimensional ceramic membrane is improved. Meanwhile, collision and vibration damage of the membrane element in the mounting and transferring process is effectively reduced, the field mounting and replacing efficiency is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparation of honeycomb ceramic catalytic carriers, and in particular relates to a local strengthening method of a honeycomb three-dimensional ceramic membrane and a product thereof. Background Art

[0002] High-temperature flue gas and dust removal integrated technology combines dust removal and denitrification, significantly simplifying flue gas treatment equipment and streamlining process flows. The key to this technology lies in the catalytic filter material. Honeycomb ceramic membranes, also known as honeycomb wall-flow filters, offer advantages such as large filtration area, low filtration resistance, high catalytic efficiency, and a long service life. This unique combination of low-resistance filtration and high catalytic activity has become a core component of high-temperature flue gas and dust removal integrated technology.

[0003] Honeycomb ceramic membranes, used as flue gas filtration elements, require frequent high-pressure air purges and regeneration to restore their filtration performance. This frequent purge of high-pressure air causes the membrane element's backwash end face to experience long-term cavitation, damaging the honeycomb pore structure and ultimately affecting both filtration and backwash performance. Therefore, to improve the high-temperature cavitation resistance of the honeycomb ceramic membrane end face and extend its service life, appropriate methods must be employed to strengthen the membrane end face.

[0004] In addition, due to the particularity of the material and structure of the honeycomb three-dimensional ceramic membrane, in actual applications, the honeycomb three-dimensional ceramic membrane is assembled with a steel component into an integrated membrane assembly, and then the membrane assembly is connected to the equipment. The integrated membrane assembly is conducive to improving the convenience of installation, protecting the ceramic membrane element, and at the same time ensuring a good connection and seal between the membrane element and the equipment. However, in order to ensure that the membrane element has sufficient filtration area, the contact area between the membrane element and the steel component is very small, and the honeycomb three-dimensional ceramic membrane is made of brittle ceramic material with a thin filter layer (1.2mm to 2mm on the outer wall and 0.7mm to 1.5mm on the inner wall). The contact support part between the membrane element and the steel component is very fragile and can be easily damaged by slight collision or vibration. If the conventional plugging method is used, when the plug of the honeycomb three-dimensional ceramic membrane is damaged, falls off, or the outer wall is damaged, the dust-laden gas can reach the outlet directly from the air inlet without passing through the hole wall. The hole wall cannot intercept the dust, the honeycomb three-dimensional ceramic membrane fails, and the filtration efficiency of the membrane element will be greatly reduced. In severe cases, the filtration performance will be lost. Therefore, it is necessary to improve the strength of the contact and support parts of the honeycomb three-dimensional ceramic membrane to solve the problem of membrane element failure caused by damage to the outer wall. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a local strengthening method of a honeycomb three-dimensional ceramic membrane and a product thereof, aiming to solve at least one technical problem in the background technology.

[0006] The present invention is achieved in that:

[0007] A first aspect of the present invention provides a local strengthening method for a honeycomb three-dimensional ceramic membrane, wherein the honeycomb three-dimensional ceramic membrane comprises a body and honeycomb pores uniformly distributed on the body, wherein the two end faces of the honeycomb pores corresponding to the body are respectively a support end face and a back-blowing end face, and each group of honeycomb pores is configured to be open at one end and blocked at the other end, and the blocked holes on the support end face and the back-blowing end face are staggered. The local strengthening method comprises performing local surface treatment on the back-blowing channel and the back-blowing end face of the honeycomb three-dimensional ceramic membrane green body, and performing continuous plugging treatment on the outer edge of the support end face of the honeycomb three-dimensional ceramic membrane green body; the locally strengthened honeycomb three-dimensional ceramic membrane green body is then dried and sintered to obtain a honeycomb three-dimensional ceramic membrane;

[0008] The local surface treatment is a coating made of inorganic paint or a metallization treatment.

[0009] Preferably, the inorganic coating is at least one of ceramic glaze, molten glass powder, and inorganic glue; after the inorganic coating is sprayed on the backflush channel, it is dried and sintered to densify the surface of the backflush channel.

[0010] Preferably, the inorganic glue is at least one of silica sol, aluminum sol and aluminum phosphate glue.

[0011] Preferably, the metallization treatment is to thermally spray a high-temperature alloy on the blowback channel or dip-coat the blowback channel with molten metal liquid, and then dry and sinter the blowback channel to metallize the blowback channel.

[0012] Preferably, the high-temperature alloy is at least one of aluminum alloy, iron-based alloy, nickel-based alloy, cobalt-based alloy and titanium-based alloy.

[0013] Preferably, the molten metal liquid is at least one of metallic aluminum liquid and aluminum alloy liquid.

[0014] Preferably, the depth of the local surface treatment of the back-blowing channel is 10 mm to 100 mm extending from the back-blowing end surface along the honeycomb channel direction.

[0015] Preferably, the hole width of the continuous plugging area is 0.5 to 1 times the hole width of the staggered plugging area.

[0016] Preferably, the continuous hole-blocking area is the outermost circle.

[0017] A second aspect of the present invention provides a product, which is produced by the local reinforcement method of the above-mentioned honeycomb three-dimensional ceramic membrane.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention utilizes a surface treatment method and a local continuous pore plugging process to improve the strength of key parts of the honeycomb three-dimensional ceramic membrane.

[0020] 2. The present invention utilizes local densification and ceramic metallization to strengthen the honeycomb pore wall of the back-blowing end face of the honeycomb three-dimensional ceramic membrane, thereby improving the high-temperature cavitation resistance of the back-blowing end face and thereby increasing its service life.

[0021] 3. The present invention utilizes an optimized edge continuous plugging method to improve the strength of the contact support portion between the honeycomb three-dimensional ceramic membrane and the steel connecting assembly, effectively reducing damage to the membrane element during installation, transportation and use, and improving on-site installation and replacement efficiency.

[0022] 4. The present invention adopts an optimized edge continuous plugging method to provide a double-layer outer wall structure for the membrane element, which can effectively solve the problem of membrane element failure caused by outer wall damage under conventional plugging methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the cross section of the integrated membrane assembly of the present invention;

[0024] Figure 2 Schematic diagram of the local three-dimensional structure of the honeycomb channel in the present invention;

[0025] Figure 3 This is a schematic cross-sectional view of the honeycomb three-dimensional ceramic membrane after pore plugging in Example 1;

[0026] Figure 4 This is a schematic cross-sectional view of the honeycomb three-dimensional ceramic membrane after pore plugging in Comparative Example 2. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific implementation cases described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figure 1 As shown, the integrated membrane assembly includes a honeycomb three-dimensional ceramic membrane and a connecting assembly 14. The honeycomb three-dimensional ceramic membrane includes a main body 11 and honeycomb pores 12 evenly distributed on the main body 11. The main body 11 and the honeycomb pores 12 are an integrated structure. The two end faces of the honeycomb pores 12 corresponding to the main body 11 are a support end face 13 and a back-blowing end face 16. The support end face 13 is used to be fixedly connected with the connecting assembly 14 to form an integrated membrane assembly. Each group of honeycomb pores 12 is set to be open at one end and blocked at the other end, that is, one end of each group of honeycomb pores 12 is blocked by a plug 15, and the blocked holes of the support end face 13 and the back-blowing end face 16 are both staggered. The support end face 13 and the back-blowing end face 16 are distinguished according to the actual position during installation.

[0029] like Figure 2As shown, the filtering mechanism of the honeycomb three-dimensional ceramic membrane is as follows: dust-laden gas enters the honeycomb pores 12 from one end of the filter. Since each honeycomb pore 12 is designed with one end open and the other end blocked (interlaced blocking), the gas cannot be discharged directly from the other end of the honeycomb pores after entering the honeycomb pores, but must pass through the pore walls of the body 11 (porous structure, gas but not dust) and enter the adjacent honeycomb pores 12 to be discharged. The pore walls play the role of intercepting dust. During specific installation, the end face where the dust-laden gas enters is the support end face 13, and the other face is the back-blowing end face 16. Back-blowing is a common maintenance measure, mainly used to remove dust or impurities accumulated on the filter during use to maintain the performance and efficiency of the filter. In the present invention, the dust-laden gas outlet end face is the back-blowing end face 16. Back-blowing is to blow a certain pressure of air in the opposite direction along the back-blowing end face 16 toward the honeycomb three-dimensional ceramic membrane to peel off and remove the dust layer impurities enriched on the surface of the dust collecting position of the honeycomb pores 12. In this process, the honeycomb pores 12 are the back-blowing channels.

[0030] In specific implementations, the integrated membrane assembly generally adopts a three-dimensional structure, such as a rectangular parallelepiped, a polygonal solid, a cylinder, etc. The following embodiments are described using a rectangular parallelepiped; the cross-sectional shape of the honeycomb channel 12 can be a square, a regular hexagon, a circle, etc. The following embodiments are described using a square.

[0031] The local strengthening method of the honeycomb three-dimensional ceramic membrane provided by the present invention mainly includes two aspects:

[0032] (1) Local surface treatment is performed on the backflush channel and backflush end face of the honeycomb three-dimensional ceramic membrane green body; specifically, the local surface treatment is a coating made of an inorganic coating or a metallization treatment; the depth of the local surface treatment of the backflush channel is 10 mm to 100 mm extending from the end face along the honeycomb channel direction. In a specific implementation, the backflush channel is the honeycomb channel 12, and the backflush end face is one of the upper / lower end faces of the honeycomb three-dimensional ceramic membrane, and the specific distribution is determined according to the membrane installation situation.

[0033] (2) Continuously plug the outer edge of the supporting end face of the honeycomb three-dimensional ceramic membrane green body. The present invention continuously plugs the four sides of the honeycomb three-dimensional ceramic membrane (the outermost circle of honeycomb holes). On the one hand, the strength is improved and it is not easy to be damaged when matched with the steel connecting component. On the other hand, even if the outermost hole wall is damaged (damage is usually most likely to occur in the outer layer), the filtering performance of the outermost layer can still be guaranteed due to the continuous plugging. The disadvantage is that the continuous plugging blocks both ends of the honeycomb channel, so the honeycomb holes in the outermost circle have no filtering function and do not participate in the filtration. The more the number of continuous plugging circles, the greater the loss of filtering area. Therefore, when ensuring that there is sufficient contact surface (continuous plugging area) between the supporting end face and the steel connecting component, the fewer the number of continuous plugging circles, the better. The outermost circle is preferably used as the continuous plugging hole. In extreme cases, through mold design, the hole width of the outermost row of holes can be made 0.5 to 1 times the normal hole width, thereby further reducing the continuous plugging area.

[0034] The honeycomb three-dimensional ceramic membrane green body after the above local strengthening operation is then dried and sintered to obtain the honeycomb three-dimensional ceramic membrane. The two local strengthening methods mentioned above can be operated in any order and can be combined at will.

[0035] Specifically, the inorganic coating is at least one of ceramic glaze, molten glass powder, and inorganic glue. After the inorganic coating is sprayed on the backflush channel, it is dried and sintered to densify the surface of the backflush channel. The inorganic glue is at least one of silica sol, aluminum sol, and aluminum phosphate glue.

[0036] Specifically, the metallization treatment involves thermally spraying a high-temperature alloy onto the blowback channel or dipping the channel into molten metal, followed by drying and sintering to metallize the blowback channel. The high-temperature alloy is at least one of an aluminum alloy, an iron-based alloy, a nickel-based alloy, a cobalt-based alloy, and a titanium-based alloy. The molten metal is at least one of molten aluminum and an aluminum alloy.

[0037] The honeycomb three-dimensional ceramic membrane, a product made by the local strengthening method of the present invention, has high-temperature cavitation resistance, strengthens the strength of the supporting parts, and improves its service life.

[0038] Example 1

[0039] In this embodiment, the honeycomb three-dimensional ceramic membrane is strengthened, and the steps are as follows:

[0040] S1. Surface treatment

[0041] The backblowing end face and backblowing channel of the honeycomb three-dimensional ceramic membrane green body with a size of L×W×H=150mm×150mm×800mm are sprayed with ceramic glaze slurry, wherein the spraying depth in the backblowing channel is 50mm, and then dried to form a ceramic glaze coating on the backblowing end face and part of the backblowing channel (50mm).

[0042] S2, plugging holes

[0043] like Figure 3 As shown, the outermost area of the support end surface 13 is used as a continuous plugging area, and the inner area is an intermittent plugging area. In this embodiment, the honeycomb cells in the continuous plugging area are completely plugged, and the hole width of this area is 1 / 2 of the hole width of the inner area; the honeycomb cells in the intermittent plugging area are staggered.

[0044] S3, Molding

[0045] The honeycomb three-dimensional ceramic membrane green body after the above surface treatment and plugging is dried and fired in a kiln, thereby obtaining a honeycomb three-dimensional ceramic membrane with locally strengthened back-blowing end faces, back-blowing channels and supporting end faces.

[0046] Example 2

[0047] In this embodiment, the honeycomb three-dimensional ceramic membrane is strengthened, and the steps are as follows:

[0048] S1. Surface treatment

[0049] The backblowing end face and backblowing channel of the honeycomb three-dimensional ceramic membrane green body with a size of L×W×H=150mm×150mm×800mm are sprayed with molten glass powder, wherein the spraying depth in the backblowing channel is 50mm, and then a glass coating is formed on the backblowing end face and part of the backblowing channel (50mm).

[0050] S2, plugging holes

[0051] like Figure 3 As shown, the outermost area of the support end surface 13 is used as a continuous plugging area, and the inner area is an intermittent plugging area. In this embodiment, the honeycomb cells in the continuous plugging area are completely plugged, and the hole width in this area is the same as the hole width in the inner area; the honeycomb cells in the intermittent plugging area are staggered.

[0052] S3, Molding

[0053] The honeycomb three-dimensional ceramic membrane green body after the above surface treatment and plugging is dried and fired in a kiln, thereby obtaining a honeycomb three-dimensional ceramic membrane with locally strengthened back-blowing end faces, back-blowing channels and supporting end faces.

[0054] Example 3

[0055] In this embodiment, based on the embodiment 1, the coating in the surface treatment step S1 is adjusted to silica sol, and the other steps and conditions are the same as those in the embodiment 1.

[0056] Example 4

[0057] In this embodiment, based on the embodiment 1, the coating in the surface treatment step S1 is adjusted to aluminum sol, and the other steps and conditions are the same as those in the embodiment 1.

[0058] Example 5

[0059] In this embodiment, based on Example 1, the coating in the surface treatment step S1 is adjusted to aluminum phosphate glue, and the other steps and conditions are consistent with Example 1.

[0060] Example 6

[0061] In this embodiment, based on the embodiment 1, the surface treatment in step S1 is adjusted to metallization treatment, and the other steps and conditions are consistent with those in the embodiment 1.

[0062] S1 of this embodiment is specifically as follows: immersing the backblowing end of the honeycomb three-dimensional ceramic membrane green body with a size of L×W×H=150mm×150mm×800mm into the configured metal aluminum liquid so that the immersion depth of the honeycomb channel is 50mm, taking it out and cooling it, and then locally metallizing the ceramics on the backblowing end face and part of the backblowing channel (50mm).

[0063] Example 7

[0064] In this embodiment, based on the embodiment 6, the metal aluminum liquid in the surface treatment in step S1 is adjusted to aluminum alloy liquid, and the other steps and conditions are consistent with those in the embodiment 6.

[0065] Example 8

[0066] In this embodiment, based on the embodiment 1, the surface treatment in step S1 is adjusted to metallization treatment, and the other steps and conditions are consistent with those in the embodiment 1.

[0067] S1 of this embodiment is specifically as follows: the backblowing end face and backblowing channel of the honeycomb three-dimensional ceramic membrane green body with a size of L×W×H=150mm×150mm×800mm are thermally sprayed with high-temperature aluminum alloy, so that the spraying depth in the honeycomb channel is 50mm, and then the backblowing end face and part of the backblowing channel (50mm) are locally ceramic metallized.

[0068] Example 9

[0069] Based on Example 8, this embodiment adjusts the surface treatment in step S1 from thermal spraying of high-temperature aluminum alloy to thermal spraying of high-temperature iron-based alloy. Other steps and conditions are consistent with those in Example 8.

[0070] Example 10

[0071] Based on Example 8, this embodiment adjusts the surface treatment of step S1 from thermal spraying of high-temperature aluminum alloy to thermal spraying of high-temperature nickel-based alloy, and the other steps and conditions are consistent with those of Example 8.

[0072] Example 11

[0073] Based on Example 8, this embodiment adjusts the surface treatment of step S1 from thermal spraying of high-temperature aluminum alloy to thermal spraying of high-temperature cobalt-based alloy, and the other steps and conditions are consistent with those of Example 8.

[0074] Example 12

[0075] Based on Example 8, this embodiment adjusts the surface treatment of step S1 from thermal spraying of high-temperature aluminum alloy to thermal spraying of high-temperature titanium-based alloy. Other steps and conditions are consistent with those of Example 8.

[0076] Example 13

[0077] In this embodiment, based on the embodiment 1, the depth of the surface treatment of the backflush channel in step S1 is adjusted to 10 mm, and the other steps and conditions are consistent with those in the embodiment 1.

[0078] Example 14

[0079] In this embodiment, based on the embodiment 1, the depth of the surface treatment of the backflush channel in step S1 is adjusted to 100 mm, and the other steps and conditions are consistent with those in the embodiment 1.

[0080] Comparative Example 1

[0081] This comparative example is based on Example 1, except that step S1 is deleted, that is, surface treatment is not performed, and other steps and conditions are consistent with those of Example 1.

[0082] Comparative Example 2

[0083] In this comparative example, based on Example 1, step S2 adopts conventional plugging operation, such as Figure 4 As shown, all intermittent plugging treatments are performed in an intermittent manner, and other steps and conditions are consistent with those in Example 1.

[0084] The mechanical properties of the honeycomb three-dimensional ceramic membranes prepared in Examples 1 to 14 and Comparative Examples 1 and 2 at high temperatures were tested. The results are shown in Table 1, specifically including the high-temperature cavitation resistance of the backflush end face and the compressive strength of the support end face. The test method is:

[0085] (1) The honeycomb three-dimensional ceramic membrane was fixed to a steel connecting component and placed together in a constant temperature oven at 250℃. The height of the sample was adjusted so that its back-blowing end face was located 150mm below the compressed air outlet. The back-blowing end face of the honeycomb three-dimensional ceramic membrane was repeatedly flushed with 0.4MPa compressed air. Each flushing time was 0.2s and the interval time was 10s. After 48h of continuous testing, the three-dimensional ceramic membrane was taken out and the maximum depth of the pit on the back-blowing end face was measured. The flushing depth was used to indicate the high-temperature cavitation resistance of the honeycomb three-dimensional ceramic membrane. The greater the flushing depth, the lower the high-temperature cavitation resistance.

[0086] (2) Test the local compressive strength of the supporting end surface of the honeycomb three-dimensional ceramic membrane according to the method specified in GB / T1964-2023.

[0087] Table 1

[0088] Scouring depth, mm Compressive strength, MPa Example 1 2.1 14.7 Example 2 2.3 14.8 Example 3 3.6 14.1 Example 4 3.3 14.1 Example 5 3.1 14.1 Example 6 2.9 15.5 Example 7 2.6 15.9 Example 8 2.6 15.7 Example 9 2.3 16.1 Example 10 2.2 16.3 Example 11 1.9 16.3 Example 12 2.0 16.2 Example 13 2.3 13.9 Example 14 2.0 16.9 Comparative Example 1 7.2 13.7 Comparative Example 2 2.2 12.6

[0089] It can be seen from the data in Table 1 that the present invention significantly improves the high temperature cavitation resistance and strength after surface treatment + pore plugging and strengthening.

[0090] It can be seen from the data of Example 1 and Example 2 that the compressive strength of the honeycomb three-dimensional ceramic membrane obtained by using a pore blocking treatment of all pores on the outer edge (the pore width is 1 / 2 to 1 times the pore width of the inner layer area) is improved.

[0091] It can be seen from the data of Examples 1 and 3 to 12 that the high-temperature cavitation resistance of the honeycomb three-dimensional ceramic membranes prepared by adopting inorganic coating or local metallization surface treatment is improved to varying degrees, and the compressive strength is also improved to a certain extent.

[0092] It can be seen from the data of Examples 1, 13 and 14 that during surface treatment, as the depth of the backflushing channel treatment increases, the degree of improvement in the high-temperature cavitation resistance of the prepared honeycomb three-dimensional ceramic membrane is roughly the same, but the compressive strength gradually increases.

[0093] Comparison of Example 1 with Comparative Example 1 shows that the high-temperature cavitation resistance of the honeycomb three-dimensional ceramic membrane without any treatment is not as good as that of the honeycomb three-dimensional ceramic membrane with inorganic coating or partial metallization surface treatment.

[0094] Comparing Example 1 with Comparative Example 2, it can be seen that the local compressive strength of the honeycomb three-dimensional ceramic membrane prepared by conventional pore plugging is lower than that of the honeycomb three-dimensional ceramic membrane with local continuous pore plugging on the supporting end surface.

[0095] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for local strengthening of a honeycomb three-dimensional ceramic membrane, the honeycomb three-dimensional ceramic membrane comprising a body and honeycomb channels evenly distributed on the body, wherein the two end faces of the honeycomb channels corresponding to the body are a support end face and a back-blowing end face, each group of honeycomb channels is configured to be open at one end and blocked at the other end, and the blocked holes on the support end face and the back-blowing end face are staggered; characterized in that: The local strengthening method includes performing local surface treatment on the back-blowing channel and back-blowing end surface of the honeycomb three-dimensional ceramic membrane green body, and performing continuous pore plugging treatment on the outer edge of the supporting end surface of the honeycomb three-dimensional ceramic membrane green body; the honeycomb three-dimensional ceramic membrane green body after local strengthening is then dried and sintered to obtain a honeycomb three-dimensional ceramic membrane; The local surface treatment is a coating made of inorganic paint or a metallization treatment.

2. The local strengthening method of a honeycomb three-dimensional ceramic membrane according to claim 1, characterized in that: The inorganic coating is at least one of ceramic glaze, molten glass powder and inorganic glue; after the inorganic coating is sprayed on the back-blowing channel, it is dried and sintered to densify the surface of the back-blowing channel.

3. The local strengthening method of a honeycomb three-dimensional ceramic membrane according to claim 2, characterized in that: The inorganic glue is at least one of silica sol, aluminum sol and aluminum phosphate glue.

4. The local strengthening method of a honeycomb three-dimensional ceramic membrane according to claim 1, characterized in that: The metallization treatment is to thermally spray a high-temperature alloy on the back-blowing channel or dip-coat the back-blowing channel with molten metal liquid, and then dry and sinter the back-blowing channel to metallize the back-blowing channel.

5. The local strengthening method of a honeycomb three-dimensional ceramic membrane according to claim 4, characterized in that: The high-temperature alloy is at least one of aluminum alloy, iron-based alloy, nickel-based alloy, cobalt-based alloy and titanium-based alloy.

6. The local strengthening method of a honeycomb three-dimensional ceramic membrane according to claim 4, characterized in that: The molten metal liquid is at least one of metal aluminum liquid and aluminum alloy liquid.

7. The local strengthening method of a honeycomb three-dimensional ceramic membrane according to claim 1, characterized in that: The depth of the local surface treatment of the back-blowing channel is 10 mm to 100 mm extending from the back-blowing end surface along the honeycomb channel direction.

8. The local strengthening method of a honeycomb three-dimensional ceramic membrane according to claim 1, characterized in that: The hole width of the continuous plugging is 0.5 to 1 times the hole width of the staggered plugging area.

9. The local strengthening method of a honeycomb three-dimensional ceramic membrane according to claim 1, characterized in that: The area of continuous hole blocking is the outermost circle.

10. A product, characterized in that The product is produced by the local strengthening method of the honeycomb three-dimensional ceramic membrane according to any one of claims 1 to 9.

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