High-strength silicon carbide ceramic membrane with inner supporting structure

Abstract

The invention discloses a high-strength silicon carbide ceramic membrane with an inner support structure, the ceramic membrane is a tubular structure with a sealed bottom end, and the ceramic membrane comprises an expansion end part, a neck reinforcing ring, a tube body and a bottom reinforcing ring from top to bottom. And the expansion end part is formed by sintering imperforate compact ceramic and the pipe body, so that the strength of the expansion end part is enhanced, and the expansion end part is a stress area in the use process, so that the end part can be prevented from cracking. The thickness of the ceramic membrane at the neck is increased by additionally arranging the neck reinforcing ring in the inner cavity of the neck, the neck is prevented from being broken due to uneven stress in the installation and use process, the diameter of the inner cavity of the neck is reduced through the neck reinforcing ring, a Venturi structure is formed, more air can be brought in through reverse blowing dust removal in the use process of the ceramic membrane, and the reverse blowing effect is enhanced. The pipe body supporting rings and the longitudinal supporting columns are additionally arranged in the pipe body, so that the longitudinal and annular strength of the ceramic membrane can be enhanced, and the pipe body is prevented from being broken under high-gas-velocity washing in the using process.

Description

Technical Field

[0001] The invention belongs to the technical field of environmentally friendly new materials, and in particular relates to a high-strength silicon carbide ceramic membrane with an internal support structure. Background Art

[0002] High-efficiency separation technology based on new materials runs through various aspects such as energy conservation and emission reduction, clean energy, environmental governance, circular economy, and low-carbon economy. High-temperature coal gas from coal combustion power generation and coal liquefaction in the energy industry, high-temperature silane mixed gas in the photovoltaic industry, high-temperature reaction gas in the petrochemical and chemical industries, high-temperature coal gas from blast furnaces and converters in the metallurgical industry, high-temperature tail gas in the glass industry, and high-temperature waste gas from boilers and incinerators all require direct purification and dust removal of solid-containing gases at high temperatures. Among the many high-temperature gas purification and dust removal process technologies, ceramic membrane filtration purification technology has significant advantages. It realizes gas-solid separation through ceramic membrane media to achieve the purpose of purifying gas and recycling resources. It can not only maximize the use of gas sensible heat and improve energy utilization, but also simplify the process, save investment in process equipment, save water resources, and avoid secondary water pollution caused by wet dust removal. The ceramic membranes currently used are mostly tubular membranes, which are sealed at one end and open at another end and hung on the flower board. Ceramic membranes are exposed to high temperature, high pressure, high corrosion, and high-velocity gas scouring during use, so the strength of the ceramic membrane is an important factor affecting its long-term stable use. Currently, ceramic membranes have problems such as broken pipes and cracks during installation and use, so strengthening the overall strength of the ceramic membrane is a key technical issue in its application. Summary of the invention

[0003] In order to solve the problem of low strength of existing ceramic membranes and prevent the occurrence of tube breakage and cracking during use, the present invention discloses a high-strength silicon carbide ceramic membrane with an internal support structure. The ceramic membrane strength is enhanced by adding support columns and reinforcement rings in the cavity inside the ceramic membrane to prevent the ceramic membrane from breaking during use.

[0004] The technical solution of the present invention is as follows: A high-strength silicon carbide ceramic membrane with an internal support structure, the ceramic membrane is a tubular structure with a sealed bottom end, and includes an expansion end, a neck reinforcement ring, a tube body, and a bottom reinforcement ring from top to bottom, wherein the neck reinforcement ring is located inside the connection between the expansion end and the tube body. The tube body includes a tube wall, a longitudinal support column, a first transverse support column, a tube body support ring, and a second transverse support column. The longitudinal support column is located at the axial symmetry center of the tube body, and the first transverse support column and the second transverse support column are located in the same horizontal plane and are vertically cross-arranged. The tube body support ring is located inside the tube body and is connected to the longitudinal support column through the first transverse support column and the second transverse support column. The bottom reinforcement ring is located inside the bottom of the tube body, the neck reinforcement ring is connected to the top of the longitudinal support column through the neck support column, and the bottom reinforcement ring is connected to the bottom end of the longitudinal support column through the bottom support column.

[0005] Furthermore, the neck reinforcement ring is sintered integrally with the tube body, and the cross section of the neck reinforcement ring is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body.

[0006] Furthermore, the cross section of the bottom reinforcement ring is semicircular and tangent to the tube wall and the bottom of the tube body.

[0007] Furthermore, the tube wall is a multi-layer structure, including a filter membrane layer, a transition layer, and a support layer from the outside to the inside. The filter membrane layer has a pore size of 1-2μm and a thickness of 20-50μm. The transition layer has a pore size of 10-20μm and a thickness of 50-100μm. The support layer has a pore size of 100-300μm and a thickness of 80-120mm.

[0008] Furthermore, the longitudinal support column, the first transverse support column, the second transverse support column, and the tube body support ring are dense and non-porous structures and are sintered together with the tube body.

[0009] Furthermore, the tube body support ring has multiple, semicircular cross-sections, one side of the diameter is sintered to the inner wall of the tube body, the diameter is 1-3mm, and they are evenly arranged on the tube body with an arrangement spacing of 10-100mm.

[0010] Furthermore, the expansion end is made of dense non-porous ceramic and is connected to the tube body by co-sintering.

[0011] Furthermore, the first transverse support column and the second transverse support column are located in the same horizontal plane and are arranged vertically.

[0012] The high-strength silicon carbide ceramic membrane with an internal support structure disclosed in the present invention has an expansion end made of non-porous dense ceramic sintered with a tube body, which strengthens the strength of the expansion end. During use, the expansion end is a stress-bearing area, which can prevent the end from cracking. The thickness of the ceramic membrane at the neck is thickened by adding a neck reinforcement ring in the inner cavity of the neck to prevent the neck from being unevenly stressed and broken during installation and use. The neck reinforcement ring reduces the inner cavity diameter of the neck to form a Venturi structure. During the use of the ceramic membrane, reverse blowing and cleaning can bring in more air to enhance the back-blowing effect. A tube body support ring and a longitudinal support column are added inside the tube body to enhance the longitudinal ring strength of the ceramic membrane and prevent the tube body from breaking under high air velocity scouring during use. The tube body is connected to the longitudinal support column by the first transverse support column and the second transverse support column to form a whole, which further enhances the overall mechanical strength of the ceramic membrane. The bottom reinforcement ring can prevent the bottom of the ceramic membrane from falling off and being damaged due to excessive reverse blowing airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the high-strength silicon carbide ceramic membrane with an internal support structure described in the present invention.

[0014] Figure 2 This is a cross-sectional view of the pipe body.

[0015] Figure 3 It is a longitudinal cross-section of the pipe body.

[0016] Figure 4 This is an electron microscope image of the tube cross section.

[0017] Figure 5 This is a data chart of pipe body strength under different pipe body support ring densities.

[0018] Among them, the expansion end 1, the neck reinforcement ring 2, the tube body 3, the bottom reinforcement ring 4, the neck support column 201, the tube wall 301, the longitudinal support column 302, the first transverse support column 303, the tube body support ring 304, the second transverse support column 305, the bottom support column 401, the filter membrane layer 3011, the transition layer 3012, and the support layer 3013. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0020] A high-strength silicon carbide ceramic membrane with an internal support structure, the ceramic membrane is a tubular structure with a sealed bottom end, and includes an expansion end 1, a neck reinforcement ring 2, a tube body 3, and a bottom reinforcement ring 4 from top to bottom. The neck reinforcement ring 2 is located inside the connection between the expansion end 1 and the tube body 3. The tube body 3 includes a tube wall 301, a longitudinal support column 302, a first transverse support column 303, a tube body support ring 304, and a second transverse support column 305. The longitudinal support column 302 is located at the axial symmetry center of the tube body 3; the first transverse support column 303 and the second transverse support column 305 are located in the same horizontal plane and are vertically cross-arranged. The bottom reinforcement ring 4 is located on the inner side of the bottom of the tube body 3, the neck reinforcement ring 2 is connected to the top of the longitudinal support column 302 through the neck support column 201, the bottom reinforcement ring 4 is connected to the bottom end of the longitudinal support column 302 through the bottom support column 401, and the tube body support ring 304 is located inside the tube body and is connected to the longitudinal support column 302 through the first transverse support column 303 and the second transverse support column 305.

[0021] Furthermore, the neck reinforcement ring 2 is sintered integrally with the tube body 3 , and the cross section of the neck reinforcement ring 2 is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body 3 .

[0022] Furthermore, the cross section of the bottom reinforcement ring 4 is semicircular and tangent to the tube wall 301 and the bottom of the tube body.

[0023] Furthermore, the tube wall 301 is a multi-layer structure, including a filter membrane layer 3011, a transition layer 3012, and a support layer 3013 from the outside to the inside. The filter membrane layer 3011 has a pore size of 1 μm and a thickness of 20 μm. The transition layer 3012 has a pore size of 10 μm and a thickness of 50 μm. The support layer has a pore size of 100 μm and a thickness of 80 mm.

[0024] Furthermore, the longitudinal support column 302, the first transverse support column 303, the second transverse support column 305, and the tube body support ring 304 are dense and non-porous structures, and are sintered together with the tube body.

[0025] Furthermore, the tube body support ring 304 has multiple, semicircular cross-sections, one side of the diameter is sintered to the inner wall of the tube body 3, the diameter is 1mm, and they are evenly arranged on the tube body 3 with an arrangement spacing of 10mm.

[0026] Furthermore, the expansion end 1 is made of dense non-porous ceramic and is connected to the tube body 3 by co-sintering.

[0027] The high-strength silicon carbide ceramic membrane with an internal support structure described in this embodiment has a comparison of strength, air permeability and particle interception efficiency compared with ordinary ceramic membranes as shown in Table 1. While maintaining basically the same resistance and filtration accuracy, the breaking strength is increased by 1 times.

[0028] Table 1 Performance comparison between Example 1 and common ceramic membrane Main indicators unit The silicon carbide film of this embodiment Conventional silicon carbide film Breaking strength MPa 56 25 resistance Pa 1500 1550 Filtration accuracy μm 0.1 0.1 Example 2

[0029] A high-strength silicon carbide ceramic membrane with an internal support structure, the ceramic membrane is a tubular structure with a sealed bottom end, and includes an expansion end 1, a neck reinforcement ring 2, a tube body 3, and a bottom reinforcement ring 4 from top to bottom. The neck reinforcement ring 2 is located inside the connection between the expansion end 1 and the tube body 3. The tube body 3 includes a tube wall 301, a longitudinal support column 302, a first transverse support column 303, a tube body support ring 304, and a second transverse support column 305. The longitudinal support column 302 is located at the axial symmetry center of the tube body 3; the first transverse support column 303 and the second transverse support column 305 are located in the same horizontal plane and are vertically cross-arranged. The bottom reinforcement ring 4 is located on the inner side of the bottom of the tube body 3, the neck reinforcement ring 2 is connected to the top of the longitudinal support column 302 through the neck support column 201, the bottom reinforcement ring 4 is connected to the bottom end of the longitudinal support column 302 through the bottom support column 401, and the tube body support ring 304 is located inside the tube body and is connected to the longitudinal support column 302 through the first transverse support column 303 and the second transverse support column 305.

[0030] Furthermore, the neck reinforcement ring 2 is sintered integrally with the tube body 3 , and the cross section of the neck reinforcement ring 2 is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body 3 .

[0031] Furthermore, the cross section of the bottom reinforcement ring 4 is semicircular and tangent to the tube wall 301 and the bottom of the tube body.

[0032] Furthermore, the tube wall 301 is a multi-layer structure, including a filter membrane layer 3011, a transition layer 3012, and a support layer 3013 from the outside to the inside. The filter membrane layer 3011 has a pore size of 2μm and a thickness of 50μm. The transition layer 3012 has a pore size of 20μm and a thickness of 100μm. The support layer has a pore size of 300μm and a thickness of 120mm.

[0033] Furthermore, the longitudinal support column 302, the first transverse support column 303, the second transverse support column 305, and the tube body support ring 304 are dense and non-porous structures, and are sintered together with the tube body.

[0034] Furthermore, the tube body support rings 304 are multiple, with a semicircular cross-section, one side of the diameter is sintered to the inner wall of the tube body 3 as a whole, the diameter is 1-3mm, and they are evenly arranged on the tube body 3 with an arrangement spacing of 100mm.

[0035] Furthermore, the expansion end 1 is made of dense non-porous ceramic and is connected to the tube body 3 by co-sintering.

[0036] The strength, air permeability and particle interception efficiency of the high-strength silicon carbide ceramic membrane with an internal support structure described in this embodiment compared with the ordinary ceramic membrane are shown in Table 2. While maintaining the resistance and filtration accuracy basically the same, the breaking strength is significantly increased.

[0037] Table 2 Performance comparison of Example 2 and common ceramic membrane Main indicators unit The silicon carbide film of this embodiment Conventional silicon carbide film Breaking strength MPa 35 25 resistance Pa 1600 1550 Filtration accuracy μm 0.1 0.1 Example 3

[0038] A high-strength silicon carbide ceramic membrane with an internal support structure, the ceramic membrane is a tubular structure with a sealed bottom end, and includes an expansion end 1, a neck reinforcement ring 2, a tube body 3, and a bottom reinforcement ring 4 from top to bottom. The neck reinforcement ring 2 is located inside the connection between the expansion end 1 and the tube body 3. The tube body 3 includes a tube wall 301, a longitudinal support column 302, a first transverse support column 303, a tube body support ring 304, and a second transverse support column 305. The longitudinal support column 302 is located on the axisymmetric center of the tube body 3; the first transverse support column 303 and the second transverse support column 305 are located in the same horizontal plane and are vertically cross-arranged. The bottom reinforcement ring 4 is located on the inner side of the bottom of the tube body 3, the neck reinforcement ring 2 is connected to the top of the longitudinal support column 302 through the neck support column 201, the bottom reinforcement ring 4 is connected to the bottom end of the longitudinal support column 302 through the bottom support column 401, and the tube body support ring 304 is located inside the tube body and is connected to the longitudinal support column 302 through the first transverse support column 303 and the second transverse support column 305.

[0039] Furthermore, the neck reinforcement ring 2 is sintered integrally with the tube body 3 , and the cross section of the neck reinforcement ring 2 is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body 3 .

[0040] Furthermore, the cross section of the bottom reinforcement ring 4 is semicircular and tangent to the tube wall 301 and the bottom of the tube body.

[0041] Furthermore, the tube wall 301 is a multi-layer structure, including a filter membrane layer 3011, a transition layer 3012, and a support layer 3013 from the outside to the inside. The filter membrane layer 3011 has a pore size of 1.5 μm and a thickness of 30 μm. The transition layer 3012 has a pore size of 15 μm and a thickness of 60 μm. The support layer has a pore size of 200 μm and a thickness of 100 mm.

[0042] Furthermore, the longitudinal support column 302, the first transverse support column 303, the second transverse support column 305, and the tube body support ring 304 are dense and non-porous structures, and are sintered together with the tube body.

[0043] Furthermore, the tube body support ring 304 has multiple, semicircular cross-sections, one side of the diameter is sintered to the inner wall of the tube body 3, the diameter is 2mm, and they are evenly arranged on the tube body 3 with an arrangement spacing of 30mm.

[0044] Furthermore, the expansion end 1 is made of dense non-porous ceramic and is connected to the tube body 3 by co-sintering.

[0045] The strength, air permeability and particle interception efficiency of the high-strength silicon carbide ceramic membrane with an internal support structure described in this embodiment compared with the ordinary ceramic membrane are shown in Table 3. When the resistance is slightly increased and the filtration accuracy is basically the same, the breaking strength is significantly increased.

[0046] Table 3 Performance comparison between Example 3 and common ceramic membrane Main indicators unit The silicon carbide film of this embodiment Conventional silicon carbide film Breaking strength MPa 52 25 resistance Pa 1650 1550 Filtration accuracy μm 0.1 0.1 Example 4

[0047] A high-strength silicon carbide ceramic membrane with an internal support structure, the ceramic membrane is a tubular structure with a sealed bottom end, and includes an expansion end 1, a neck reinforcement ring 2, a tube body 3, and a bottom reinforcement ring 4 from top to bottom. The neck reinforcement ring 2 is located inside the connection between the expansion end 1 and the tube body 3. The tube body 3 includes a tube wall 301, a longitudinal support column 302, a first transverse support column 303, a tube body support ring 304, and a second transverse support column 305. The longitudinal support column 302 is located on the axisymmetric center of the tube body 3; the first transverse support column 303 and the second transverse support column 305 are located in the same horizontal plane and are vertically cross-arranged. The bottom reinforcement ring 4 is located on the inner side of the bottom of the tube body 3, the neck reinforcement ring 2 is connected to the top of the longitudinal support column 302 through the neck support column 201, the bottom reinforcement ring 4 is connected to the bottom end of the longitudinal support column 302 through the bottom support column 401, and the tube body support ring 304 is located inside the tube body and is connected to the longitudinal support column 302 through the first transverse support column 303 and the second transverse support column 305.

[0048] Furthermore, the neck reinforcement ring 2 is sintered integrally with the tube body 3 , and the cross section of the neck reinforcement ring 2 is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body 3 .

[0049] Furthermore, the cross section of the bottom reinforcement ring 4 is semicircular and tangent to the tube wall 301 and the bottom of the tube body.

[0050] Furthermore, the tube wall 301 is a multi-layer structure, including a filter membrane layer 3011, a transition layer 3012, and a support layer 3013 from the outside to the inside. The filter membrane layer 3011 has a pore size of 2 μm and a thickness of 40 μm. The transition layer 3012 has a pore size of 18 μm and a thickness of 80 μm. The support layer has a pore size of 280 μm and a thickness of 110 mm.

[0051] Furthermore, the longitudinal support column 302, the first transverse support column 303, the second transverse support column 305, and the tube body support ring 304 are dense and non-porous structures, and are sintered together with the tube body.

[0052] Furthermore, the tube body support ring 304 has multiple, semicircular cross-sections, one side of the diameter is sintered to the inner wall of the tube body 3, the diameter is 2.5 mm, and they are evenly arranged on the tube body 3 with an arrangement spacing of 40 mm.

[0053] Furthermore, the expansion end 1 is made of dense non-porous ceramic and is connected to the tube body 3 by co-sintering.

[0054] The strength, air permeability and particle interception efficiency of the high-strength silicon carbide ceramic membrane with an internal support structure described in this embodiment compared with the ordinary ceramic membrane are shown in Table 4. When the resistance is slightly increased and the filtration accuracy is basically the same, the breaking strength is significantly increased.

[0055] Table 4 Performance comparison of Example 4 and common ceramic membrane Main indicators unit The silicon carbide film of this embodiment Conventional silicon carbide film Breaking strength MPa 50 25 resistance Pa 1600 1550 Filtration accuracy μm 0.1 0.1

Claims

1. A high-strength silicon carbide ceramic membrane with an internal support structure, characterized in that: The ceramic membrane is a tubular structure with a sealed bottom end, and comprises, from top to bottom, an expansion end (1), a neck reinforcement ring (2), a tube body (3), and a bottom reinforcement ring (4); the neck reinforcement ring (2) is located inside the connection between the expansion end (1) and the tube body (3); the tube body (3) comprises a tube wall (301), a longitudinal support column (302), a first transverse support column (303), a tube body support ring (304), and a second transverse support column (305); the longitudinal support column (302) is located at the axial symmetry center of the tube body (3); the first transverse support column (303) is located at the axial symmetry center of the tube body (3); ) and the second transverse support column (305) are located in the same horizontal plane and are arranged vertically and crosswise, the tube body support ring (304) is located on the inner side of the tube body (3) and is connected to the longitudinal support column (302) through the first transverse support column (303) and the second transverse support column (305); the bottom reinforcement ring (4) is located on the inner side of the bottom of the tube body (3), the neck reinforcement ring (2) is connected to the top end of the longitudinal support column (302) through the neck support column (201), and the bottom reinforcement ring (4) is connected to the bottom end of the longitudinal support column (302) through the bottom support column (401).

2. The high-strength silicon carbide ceramic membrane with an internal support structure according to claim 1, characterized in that: The neck reinforcement ring (2) is sintered integrally with the tube body (3); the cross section of the neck reinforcement ring (2) is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body (3).

3. The high-strength silicon carbide ceramic membrane with an internal support structure according to claim 1, characterized in that: The bottom reinforcement ring (4) has a semicircular cross section and is tangent to the tube wall (301) and the bottom of the tube body.

4. The high-strength silicon carbide ceramic membrane with an internal support structure according to claim 1, characterized in that: The tube wall (301) is a multi-layer structure, comprising, from the outside to the inside, a filter membrane layer (3011), a transition layer (3012), and a support layer (3013); the filter membrane layer (3011) has a pore size of 1-2 μm and a thickness of 20-50 μm; the transition layer (3012) has a pore size of 10-20 μm and a thickness of 50-100 μm; the support layer has a pore size of 100-300 μm and a thickness of 80-120 mm.

5. The high-strength silicon carbide ceramic membrane with an internal support structure according to claim 1, characterized in that: The longitudinal support column (302), the first transverse support column (303), the second transverse support column (305), and the tube body support ring (304) are dense and non-porous structures and are prepared by sintering together with the tube body.

6. The high-strength silicon carbide ceramic membrane with an internal support structure according to claim 1, characterized in that: The tube body support rings (304) are provided in plurality, with a semicircular cross-section, one side of the diameter being sintered integrally with the inner wall of the tube body (3), with a diameter of 1-3 mm, and are evenly arranged on the tube body (3) at an arrangement spacing of 10-100 mm.

7. The high-strength silicon carbide ceramic membrane with an internal support structure according to claim 1, characterized in that: The expansion end (1) is made of dense non-porous ceramic and is connected to the tube body (3) by co-sintering.

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