CN113387706A - Wear-resistant corrosion-resistant silicon carbide cap for waste heat boiler water-cooling wall lining - Google Patents
Wear-resistant corrosion-resistant silicon carbide cap for waste heat boiler water-cooling wall lining Download PDFInfo
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- CN113387706A CN113387706A CN202110438567.7A CN202110438567A CN113387706A CN 113387706 A CN113387706 A CN 113387706A CN 202110438567 A CN202110438567 A CN 202110438567A CN 113387706 A CN113387706 A CN 113387706A
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- silicon carbide
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- cap
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 18
- 238000005260 corrosion Methods 0.000 title claims abstract description 13
- 230000007797 corrosion Effects 0.000 title claims abstract description 13
- 239000002918 waste heat Substances 0.000 title claims abstract description 10
- 238000001816 cooling Methods 0.000 title description 6
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 3
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims abstract description 3
- 230000005484 gravity Effects 0.000 claims abstract description 3
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 18
- 239000002184 metal Substances 0.000 abstract description 18
- 239000011819 refractory material Substances 0.000 abstract description 16
- 238000005299 abrasion Methods 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 239000010426 asphalt Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/04—Supports for linings
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate or hypophosphite
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- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
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- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
A wear-resistant and corrosion-resistant silicon carbide cap for a waste heat boiler water wall lining belongs to the technical field of silicon carbide caps. The weight percentage of the raw materials is as follows: 40-60% of silicon carbide fine powder with the particle size of 0-1 mm; 10-30% of alumina fine powder with the granularity of 0-1 mm; 5-10% of silicon carbide fine powder with the granularity of 200 meshes; 3-10% of silicon carbide fine powder with the particle size of less than or equal to 5 mu m; 3-10% of high-aluminum micro powder; 3-8% of silica micro powder; the specific gravity is 1.3-1.55 g/cm33-5% of aluminum dihydrogen phosphate solution. The components are mixed and stirred uniformly, pressed and formed under the pressure of 80-100 MPa, and then heat treated for 12-15 hours at the temperature of 1000-1200 ℃. The application method is that the metal pin is installed on the head part of a corresponding metal pin on site and fixed by adopting a high-temperature adhesive. Has the advantages that: system for makingThe prepared silicon carbide cap not only protects the metal pin and prevents the metal piece from high-temperature abrasion and corrosion, but also has a thermal expansion coefficient close to that of the refractory material, is easy to sinter with the refractory material to form a whole, and solves the problem of falling off of the refractory material.
Description
Technical Field
The invention belongs to the technical field of silicon carbide caps, and particularly relates to a wear-resistant corrosion-resistant silicon carbide cap for a waste heat boiler water-cooled wall lining.
Background
Local water-cooling walls of waste heat boilers such as CFB boilers, garbage power plants, coal water slurry gasifiers and the like are seriously abraded and corroded by materials and smoke gas, a layer of wear-resistant and corrosion-resistant material is generally constructed on the water-cooling wall pipe, the design thickness is different from 40mm to 125mm, and metal pins or pilings are adopted for anchoring (the distance between the metal pins and the surface of the refractory material is about 10mm to 30 mm), so that the effect of protecting the water-cooling wall pipe is achieved. The temperature difference of the water-cooled wall is large, the thickness of the refractory lining is thin, the distance between the metal pin and the surface of the refractory material is small, and the refractory material is often peeled off due to the mismatch of the thermal expansion coefficients of the metal pin and the refractory material. Therefore, asphalt paint or plastic caps are generally brushed on the heads of the metal pieces during construction, and the asphalt paint or the plastic caps are ablated at high temperature to play a role in relieving expansion, but the problem of falling of the refractory materials cannot be fundamentally solved. Therefore, it is necessary to develop and prepare a wear-resistant and corrosion-resistant silicon carbide cap with a certain strength, which not only protects the metal pin and prevents the metal part from high-temperature wear and corrosion, but also has a thermal expansion coefficient close to that of the refractory material, and is easy to sinter with the refractory material to form a whole, thereby solving the problem of falling off.
Disclosure of Invention
The invention aims to provide a wear-resistant corrosion-resistant silicon carbide cap for a waste heat boiler water-cooling wall lining, which can protect metal pins and prevent metal parts from being worn and corroded at high temperature, and the silicon carbide cap has a thermal expansion coefficient close to that of a refractory material and is easy to sinter with the refractory material to form a whole, so that the problem of falling of the silicon carbide cap is solved.
The technical scheme of the invention is as follows:
the weight percentage of the raw materials is as follows: 40-60% of silicon carbide fine powder with the particle size of 0-1 mm; 10-30% of alumina fine powder with the granularity of 0-1 mm; 5-10% of silicon carbide fine powder with the granularity of 200 meshes; 3-10% of silicon carbide fine powder with the particle size of less than or equal to 5 mu m; 3-10% of high-aluminum micro powder; 3-8% of silica micro powder; the specific gravity is 1.3-1.55 g/cm33-5% of aluminum dihydrogen phosphate solution. The total amount of each component meets the rule of 100 percent.
The size carborundum cap internal diameter size is phi 5 ~ 30mm, and the hole degree of depth 5 ~ 30mm, wall thickness 3 ~ 20mm, for the convenience of shaping, the drawing of patterns inclination is 1 ~ 10.
Mixing and stirring the product forming raw materials, pouring the mixture into a mold, carrying out extrusion forming under the pressure of 80-100 MPa, and then carrying out heat treatment at 1000-1200 ℃ for at least 12-15 h.
The application method is that the metal pin is installed on the head part of a corresponding metal pin on site and fixed by adopting a high-temperature adhesive.
The invention has the advantages that the prepared silicon carbide cap not only protects the metal pin and prevents the metal piece from high-temperature abrasion and corrosion, but also has the thermal expansion coefficient close to that of the refractory material, is easy to be sintered with the refractory material to form a whole, and solves the problem of falling off of the refractory material.
Drawings
Fig. 1 is a schematic view of a product installation manner.
Detailed Description
Preparing raw materials
Accurately weighing the raw materials according to the three proportions, mixing and stirring, carrying out extrusion forming under the pressure of 80MPa, then baking for 12.5h at 1050 ℃, and finally installing and using according to the requirements, wherein the inner diameter phi of the prefabricated silicon carbide cap is 18mm, the depth of an inner hole is 20mm, and the wall thickness is 10 mm.
The product has been tried on the waste heat boiler water wall lining of some projects such as CFB coal fired boiler and domestic waste power generation in China, not only effectively reduces the problem that the waste heat boiler water wall pipe refractory material drops, can protect the metal pin not corroded and abraded fast moreover, and the result of use is good.
Claims (3)
1. The utility model provides a wear-resisting corrosion-resistant carborundum cap is used to exhaust-heat boiler water wall lining which characterized in that: the weight percentage of the raw materials is as follows: 40-60% of silicon carbide fine powder with the particle size of 0-1 mm; 10-30% of alumina fine powder with the granularity of 0-1 mm; 5-10% of silicon carbide fine powder with the granularity of 200 meshes; 3-10% of silicon carbide fine powder with the particle size of less than or equal to 5 mu m; 3-10% of high-aluminum micro powder; 3-8% of silica micro powder; the specific gravity is 1.3-1.55 g/cm33-5% of aluminum dihydrogen phosphate solution.
2. The wear-resistant corrosion-resistant silicon carbide cap for the water wall lining of the waste heat boiler as claimed in claim 1, wherein the inner diameter of the silicon carbide cap is phi 5-30 mm, the depth of an inner hole is 5-30 mm, the wall thickness is 3-20 mm, and the demoulding inclination is 1-10 °.
3. The wear-resistant corrosion-resistant silicon carbide cap for the water-cooled wall lining of the waste heat boiler as claimed in claim 1 or 2, wherein the raw materials are weighed and uniformly mixed in proportion, poured into a mold, molded under the pressure of 80-100 MPa, and then heat-treated at 1000-1200 ℃ for at least 12-15 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110438567.7A CN113387706A (en) | 2021-04-22 | 2021-04-22 | Wear-resistant corrosion-resistant silicon carbide cap for waste heat boiler water-cooling wall lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110438567.7A CN113387706A (en) | 2021-04-22 | 2021-04-22 | Wear-resistant corrosion-resistant silicon carbide cap for waste heat boiler water-cooling wall lining |
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| Publication Number | Publication Date |
|---|---|
| CN113387706A true CN113387706A (en) | 2021-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110438567.7A Pending CN113387706A (en) | 2021-04-22 | 2021-04-22 | Wear-resistant corrosion-resistant silicon carbide cap for waste heat boiler water-cooling wall lining |
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| CN (1) | CN113387706A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007079806A1 (en) * | 2005-12-23 | 2007-07-19 | Refractory Intellectual Property Gmbh & Co. Kg | Mix for a refractory ceramic product and refractory ceramic product produced therefrom |
| CN201610882U (en) * | 2009-11-30 | 2010-10-20 | 上海锅炉厂有限公司 | Y-shaped pin for increasing contact area of wear-resistant, refractory and heat-insulating material for fixation |
| CN102464495A (en) * | 2010-11-04 | 2012-05-23 | 宜兴市中环耐火材料有限公司 | Anticorrosive refractory material for furnace wall pin protective sleeve and production method thereof |
| CN106431427A (en) * | 2016-08-26 | 2017-02-22 | 中国华能集团清洁能源技术研究院有限公司 | Zirconium-chromium-silicon carbide wear-resistant corrosion-resistant plastic refractory material for circulating fluidized bed boiler |
| CN112430098A (en) * | 2020-11-20 | 2021-03-02 | 北京金隅通达耐火技术有限公司 | Self-protection silicon carbide corrosion-resistant material for water-cooled wall of pulverized coal gasification furnace |
-
2021
- 2021-04-22 CN CN202110438567.7A patent/CN113387706A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007079806A1 (en) * | 2005-12-23 | 2007-07-19 | Refractory Intellectual Property Gmbh & Co. Kg | Mix for a refractory ceramic product and refractory ceramic product produced therefrom |
| CN201610882U (en) * | 2009-11-30 | 2010-10-20 | 上海锅炉厂有限公司 | Y-shaped pin for increasing contact area of wear-resistant, refractory and heat-insulating material for fixation |
| CN102464495A (en) * | 2010-11-04 | 2012-05-23 | 宜兴市中环耐火材料有限公司 | Anticorrosive refractory material for furnace wall pin protective sleeve and production method thereof |
| CN106431427A (en) * | 2016-08-26 | 2017-02-22 | 中国华能集团清洁能源技术研究院有限公司 | Zirconium-chromium-silicon carbide wear-resistant corrosion-resistant plastic refractory material for circulating fluidized bed boiler |
| CN112430098A (en) * | 2020-11-20 | 2021-03-02 | 北京金隅通达耐火技术有限公司 | Self-protection silicon carbide corrosion-resistant material for water-cooled wall of pulverized coal gasification furnace |
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