High-strength silicon carbide ceramic membrane with internal support structure

Abstract

The application discloses a high-strength silicon carbide ceramic membrane with an internal support structure, and the ceramic membrane is a tubular structure with a sealed bottom end and comprises, from top to bottom, an expansion end part, a neck part reinforcing ring, a tube body and a bottom part reinforcing ring. The expansion end part is sintered from a non-porous dense ceramic and the tube body, so that the strength of the expansion end part is enhanced, and the expansion end part is a stress area during use, so that the end part can be prevented from cracking. The ceramic membrane thickness of the neck part is thickened by additionally arranging the neck part reinforcing ring in the inner cavity of the neck part, so that the neck part is prevented from being broken due to uneven stress during installation and use, the neck part reinforcing ring reduces the diameter of the inner cavity of the neck part, a Venturi structure is formed, more air can be brought in during back-blowing and ash cleaning of the ceramic membrane, and the back-blowing effect is enhanced. The tube body support ring and the longitudinal support column arranged in the tube body can enhance the longitudinal and circumferential strength of the ceramic membrane, and prevent the tube body from being broken under high-speed scouring during use.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new environmental protection materials, and particularly relates to a high-strength silicon carbide ceramic membrane with an internal support structure. BACKGROUND

[0002] High-efficiency separation technology based on new materials is used in energy saving and emission reduction, clean energy, environmental governance, circular economy, low-carbon economy and other aspects. High-temperature coal gas in the energy industry, high-temperature silane mixed gas in the photovoltaic industry, high-temperature reaction gas in the petrochemical and chemical industry, high-temperature coal gas in the metallurgical industry, high-temperature tail gas in the glass industry, high-temperature waste gas of boilers and incinerators, etc. all need direct purification and dust removal of high-temperature solid-containing gas. Among many high-temperature gas purification and dust removal process technologies, ceramic membrane filtration and purification technology has obvious advantages. It realizes gas-solid separation through ceramic membrane medium to achieve the purpose of purifying gas and recycling resources. Not only can the sensible heat of the gas be used to the greatest extent to improve energy utilization, but also the process can be simplified to save investment in process equipment, water resources can be saved, and secondary water pollution caused by wet dust removal can be avoided. The ceramic membranes used at present are mostly tubular membranes, which are sealed in one section and open in the other section and hung on the flower plate during use. Ceramic membranes face high temperature, high pressure, high corrosion and high flow rate gas scouring during use, so the strength of the ceramic membrane is an important factor affecting its long-period stable use. There are problems such as broken pipes and cracking in the installation and use of the current ceramic membranes, so strengthening the overall strength of the ceramic membrane is a key technical problem in the application process. SUMMARY

[0003] In order to solve the problem of low strength of the existing ceramic membrane and prevent the problems of broken pipes and cracking during use, the application discloses a high-strength silicon carbide ceramic membrane with an internal support structure. The strength of the ceramic membrane is strengthened by adding support columns and reinforcing rings in the cavities in the ceramic membrane to prevent the ceramic membrane from breaking during use.

[0004] The technical scheme of the application is as follows:

[0005] The application discloses a high-strength silicon carbide ceramic membrane with an internal support structure, which is a bottom-sealed tubular structure and comprises, from top to bottom, an expansion end, a neck strengthening ring, a tube body, and a bottom strengthening ring, wherein the neck strengthening ring is arranged inside the connection between the expansion end and the tube body; the tube body comprises 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 arranged on the axial symmetry center of the tube body, and the first transverse support column and the second transverse support column are arranged on the same horizontal plane and perpendicularly intersected; the tube body support ring is arranged on the inner side of the tube body and connected with the longitudinal support column through the first transverse support column and the second transverse support column; the bottom strengthening ring is arranged on the inner side of the bottom of the tube body, the neck strengthening ring is connected with the top end of the longitudinal support column through a neck support column, and the bottom strengthening ring is connected with the bottom end of the longitudinal support column through a bottom support column.

[0006] Further, the neck strengthening ring is integrally sintered with the tube body, the cross section of the neck strengthening ring is semicircular, and the diameter of the neck strengthening ring is 1 / 2 of the inner diameter of the tube body.

[0007] Further, the cross section of the bottom strengthening ring is semicircular and tangent to the tube wall and the bottom of the tube body.

[0008] Further, the tube wall is a multilayer structure comprising, from outside to inside, a filter membrane layer, a transition layer, and a support layer, the filter membrane layer has a pore size of 1-2 microns and a thickness of 20-50 microns, the transition layer has a pore size of 10-20 microns and a thickness of 50-100 microns, and the support layer has a pore size of 100-300 microns and a thickness of 80-120 microns.

[0009] Further, the longitudinal support column, the first transverse support column and the second transverse support column, and the tube body support ring are dense and non-porous structures and are integrally sintered with the tube body.

[0010] Further, the tube body support ring has a plurality of semicircular structures, one side of the diameter of each semicircular structure is integrally sintered with the inner wall of the tube body, the diameter of each semicircular structure is 1-3 mm, and the semicircular structures are uniformly arranged on the tube body with a spacing of 10-100 mm.

[0011] Further, the expansion end is dense and non-porous ceramic and is connected with the tube body through co-sintering.

[0012] Further, the first transverse support column and the second transverse support column are arranged on the same horizontal plane and perpendicularly.

[0013] The high-strength silicon carbide ceramic membrane with internal support structure has the following advantages: the expansion end is sintered with the non-porous dense ceramic and the pipe body, so that the strength of the expansion end is strengthened; the expansion end is the stress area during use, so that the end cracking is prevented; the ceramic membrane thickness of the neck is thickened by adding the neck reinforcing ring in the inner cavity of the neck, so that the neck stress uneven fracture during installation and use is prevented; the neck reinforcing ring reduces the inner cavity diameter of the neck, forms the Venturi structure, and more air is brought in during the back-blowing dust removal of the ceramic membrane, so that the back-blowing effect is enhanced; the pipe body support ring and the longitudinal support column are added in the pipe body, so that the strength of the ceramic membrane in the longitudinal and circumferential directions is enhanced, and the pipe body is prevented from being broken under the high air speed scouring during use; the pipe body and the longitudinal support column are connected by the first and second transverse support columns to form a whole, so that the mechanical strength of the whole ceramic membrane is further enhanced; and the bottom reinforcing ring prevents the ceramic membrane pipe bottom from falling off and being damaged due to the too large back-blowing air flow. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The figure is a structural schematic diagram of the high-strength silicon carbide ceramic membrane with internal support structure.

[0015] Figure 2 The figure is a pipe body cross-sectional view.

[0016] Figure 3 The figure is a pipe body longitudinal sectional view.

[0017] Figure 4 The figure is a pipe body sectional electron microscope view.

[0018] Figure 5 The figure is a pipe body strength data view under different pipe body support ring densities.

[0019] The expansion end 1, the neck reinforcing ring 2, the pipe body 3, the bottom reinforcing ring 4, the neck support column 201, the pipe wall 301, the longitudinal support column 302, the first transverse support column 303, the pipe 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

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application. Embodiment 1

[0021] A high-strength silicon carbide ceramic membrane with an internal support structure, the ceramic membrane is a bottom-sealed tubular structure, from top to bottom including an expansion end 1, a neck strengthening ring 2, a tube body 3, a bottom strengthening ring 4, the neck strengthening 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 on the same horizontal plane and are arranged vertically intersected. The bottom strengthening ring 4 is located inside the bottom of the tube body 3, the neck strengthening ring 2 is connected with the top end of the longitudinal support column 302 through a neck support column 201, the bottom strengthening ring 4 is connected with the bottom end of the longitudinal support column 302 through a bottom support column 401, the tube body support ring 304 is located inside the tube body, and is connected with the longitudinal support column 302 through the first transverse support column 303 and the second transverse support column 305.

[0022] Further, the neck strengthening ring 2 and the tube body 3 are integrally sintered, the cross section of the neck strengthening ring 2 is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body 3.

[0023] Further, the bottom strengthening ring 4 is semicircular in cross section and is tangent to the tube wall 301 and the bottom of the tube body.

[0024] Further, the tube wall 301 is a multi-layer structure, from outside to inside including 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 μm and a thickness of 20 μm, the transition layer 3012 has a pore size of 10 μm and a thickness of 50 μm, and the support layer has a pore size of 100 μm and a thickness of 80 mm.

[0025] Further, 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.

[0026] Further, the tube body support ring 304 has a plurality of semicircular structures, one side of the diameter is sintered integrally with the inner wall of the tube body 3, and the diameter is 1 mm, and is uniformly arranged on the tube body 3 with an arrangement interval of 10 mm.

[0027] Further, the expansion end 1 is a dense and non-porous ceramic connected with the tube body 3 by co-sintering.

[0028] The high-strength silicon carbide ceramic membrane with an internal support structure described in the embodiment has a strength, air permeability, and particulate matter interception efficiency compared with ordinary ceramic membranes as shown in Table 1, and in the case of maintaining the same resistance and filtration precision, the breaking strength is increased by 1 times.

[0029] Table 1 Performance comparison of Example 1 and common ceramic membrane

[0030] Main index Unit Silicon carbide film of this example Conventional silicon carbide film Breaking strength MPa 56 25 Resistance Pa 1500 1550 Filtering accuracy μm 0.1 0.1 Example 2

[0031] A high-strength silicon carbide ceramic membrane with an internal support structure, the ceramic membrane is a bottom-sealed tubular structure, from top to bottom including an expansion end 1, a neck strengthening ring 2, a tube body 3, a bottom strengthening ring 4, the neck strengthening 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 on the same horizontal plane and are arranged vertically intersected. The bottom strengthening ring 4 is located inside the bottom of the tube body 3, the neck strengthening ring 2 is connected with the top end of the longitudinal support column 302 through a neck support column 201, the bottom strengthening ring 4 is connected with the bottom end of the longitudinal support column 302 through a bottom support column 401, the tube body support ring 304 is located inside the tube body, and is connected with the longitudinal support column 302 through the first transverse support column 303 and the second transverse support column 305.

[0032] Further, the neck strengthening ring 2 and the tube body 3 are integrally sintered, the cross section of the neck strengthening ring 2 is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body 3.

[0033] Further, the bottom strengthening ring 4 is semicircular in cross section and tangent to the tube wall 301 and the bottom of the tube body.

[0034] Further, 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 outside to inside, the filter membrane layer 3011 has a pore size of 2 μm and a thickness of 50 μm, the transition layer 3012 has a pore size of 20 μm and a thickness of 100 μm, and the support layer has a pore size of 300 μm and a thickness of 120 mm.

[0035] Further, 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.

[0036] Further, the tube body support ring 304 has multiple semicircular structures, one side of the diameter is sintered with the inner wall of the tube body 3, and the diameter is 1-3 mm, and is uniformly arranged on the tube body 3 with an arrangement interval of 100 mm.

[0037] Further, the expansion end 1 is a dense and non-porous ceramic connected with the tube body 3 by co-sintering.

[0038] The high-strength silicon carbide ceramic membrane with internal support structure has the advantages of high strength, high permeation flux and high particle interception efficiency, as shown in Table 2. The breaking strength is significantly increased while the resistance and filtration accuracy are maintained.

[0039] Table 2 Performance comparison between Example 2 and ordinary ceramic membrane

[0040] Main index Unit Silicon carbide film of this example Conventional silicon carbide film Breaking strength MPa 35 25 Resistance Pa 1600 1550 Filtering accuracy μm 0.1 0.1 Example 3

[0041] A high-strength silicon carbide ceramic membrane with internal support structure, the ceramic membrane is a bottom-sealed tubular structure, including an expansion end 1, a neck strengthening ring 2, a tube body 3, a bottom strengthening ring 4 from top to bottom, the neck strengthening 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 on the same horizontal plane and are arranged perpendicularly. The bottom strengthening ring 4 is located inside the bottom of the tube body 3, the neck strengthening ring 2 is connected to the top end of the longitudinal support column 302 through a neck support column 201, the bottom strengthening ring 4 is connected to the bottom end of the longitudinal support column 302 through a bottom support column 401, 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.

[0042] Further, the neck strengthening ring 2 and the tube body 3 are integrally sintered, the cross section of the neck strengthening ring 2 is semicircular, and the diameter is 1 / 2 of the inner diameter of the tube body 3.

[0043] Further, the bottom strengthening ring 4 has a semicircular cross section and is tangent to the tube wall 301 and the bottom of the tube body.

[0044] Further, the tube wall 301 has a multi-layer structure, including a filter membrane layer 3011, a transition layer 3012, and a support layer 3013 from outside to 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, and the support layer has a pore size of 200 μm and a thickness of 100 mm.

[0045] Further, 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.

[0046] Further, the pipe body support ring 304 has a plurality of semicircular structures in cross section, and is sintered with the inner wall of the pipe body 3 at one side of the diameter, with a diameter of 2 mm, and is uniformly arranged on the pipe body 3 with an arrangement interval of 30 mm.

[0047] Further, the expansion end portion 1 is dense and non-porous ceramic, and is connected with the pipe body 3 through co-sintering.

[0048] The high-strength silicon carbide ceramic membrane with the internal support structure has the strength, air permeability and particle interception efficiency compared with the ordinary ceramic membrane as shown in Table 3. In the case of slightly increased resistance and basically the same filtration precision, the breaking strength is obviously increased.

[0049] Table 3 Performance comparison of Example 3 and ordinary ceramic membrane

[0050] Main index Unit Silicon carbide film of this example Conventional silicon carbide film Breaking strength MPa 52 25 Resistance Pa 1650 1550 Filtering accuracy μm 0.1 0.1 Example 4

[0051] A high-strength silicon carbide ceramic membrane with an internal support structure, the ceramic membrane is a bottom-sealed tubular structure, including an expansion end portion 1, a neck strengthening ring 2, a pipe body 3, a bottom strengthening ring 4 from top to bottom, the neck strengthening ring 2 is located inside the connection between the expansion end portion 1 and the pipe body 3, the pipe body 3 includes a pipe wall 301, a longitudinal support column 302, a first transverse support column 303, a pipe body support ring 304, a second transverse support column 305, the longitudinal support column 302 is located on the axisymmetric center of the pipe body 3; the first transverse support column 303 and the second transverse support column 305 are located on the same horizontal plane and are arranged perpendicularly. The bottom strengthening ring 4 is located inside the bottom of the pipe body 3, the neck strengthening ring 2 is connected with the top end of the longitudinal support column 302 through the neck support column 201, the bottom strengthening ring 4 is connected with the bottom end of the longitudinal support column 302 through the bottom support column 401, the pipe body support ring 304 is located inside the pipe body, and is connected with the longitudinal support column 302 through the first transverse support column 303 and the second transverse support column 305.

[0052] Further, the neck strengthening ring 2 is integrally sintered with the pipe body 3, and the cross section of the neck strengthening ring 2 is semicircular with a diameter of 1 / 2 of the inner diameter of the pipe body 3.

[0053] Further, the bottom strengthening ring 4 is semicircular in cross section and tangent to the pipe wall 301 and the bottom of the pipe body.

[0054] Further, the pipe wall 301 is a multi-layer structure, including a filter membrane layer 3011, a transition layer 3012 and a support layer 3013 from outside to 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, and the support layer has a pore size of 280 μm and a thickness of 110 mm.

[0055] Further, the longitudinal support column 302, the first and second lateral support columns 303 and 305, and the tube body support ring 304 are dense and non-porous structures, and are prepared by co-sintering with the tube body.

[0056] Further, the tube body support ring 304 has a plurality of semicircular structures in cross section, and is sintered with the inner wall of the tube body 3 on one side of the diameter, with a diameter of 2.5 mm, and is uniformly arranged on the tube body 3 with an arrangement interval of 40 mm.

[0057] Further, the expansion end portion 1 is dense and non-porous ceramic, and is connected to the tube body 3 by co-sintering.

[0058] The high-strength silicon carbide ceramic membrane with internal support structure according to the embodiment has a strength, air permeability, and particulate matter interception efficiency compared with ordinary ceramic membranes as shown in Table 4. In the case of slightly increased resistance and basically the same filtration precision, the breaking strength is significantly increased.

[0059] Table 4 Performance comparison between Example 4 and ordinary ceramic membrane

[0060] Main index Unit Silicon carbide film of this example Conventional silicon carbide film Breaking strength MPa 50 25 Resistance Pa 1600 1550 Filtering accuracy μm Main index Unit Silicon carbide film of this example Conventional silicon carbide film Breaking strength MPa Resistance Pa Filtering accuracy μm Main index Unit Silicon carbide film of this example Conventional silicon carbide film Breaking strength MPa Resistance Pa Filtering accuracy μm 0.1 0.1

Claims

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

2. The high-strength silicon carbide ceramic membrane having an internal support structure according to claim 1, wherein, The neck strengthening ring (2) is integrally sintered with the tube body (3); the cross section of the neck strengthening 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 internal support structure according to claim 1, wherein, The cross section of the bottom strengthening ring (4) is semicircular and is tangent to the tube wall (301) and the bottom of the tube body.

4. The high-strength silicon carbide ceramic membrane with internal support structure according to claim 1, wherein, The tube wall (301) is a multilayer structure, comprising a filter membrane layer (3011), a transition layer (3012), and a support layer (3013) from outside to inside; 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; and 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 internal support structure according to claim 1, wherein, 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.

6. The high strength silicon carbide ceramic membrane with internal support structure of claim 1, wherein, The tube body support ring (304) has multiple semicircular structures, one side of the diameter of which is sintered with the inner wall of the tube body (3) to form an integral structure, and the diameter is 1-3 mm; the tube body support rings are uniformly arranged on the tube body (3) with a spacing of 10-100 mm.

7. The high-strength silicon carbide ceramic membrane with internal support structure according to claim 1, wherein The expansion end (1) is a dense and non-porous ceramic and is connected with the tube body (3) through co-sintering.

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