CN111892412B - High-radiance energy-saving radiator of heating furnace and preparation method thereof - Google Patents
High-radiance energy-saving radiator of heating furnace and preparation method thereof Download PDFInfo
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- CN111892412B CN111892412B CN202010816447.1A CN202010816447A CN111892412B CN 111892412 B CN111892412 B CN 111892412B CN 202010816447 A CN202010816447 A CN 202010816447A CN 111892412 B CN111892412 B CN 111892412B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 127
- 238000002360 preparation method Methods 0.000 title claims description 20
- 238000010304 firing Methods 0.000 claims abstract description 82
- 238000001816 cooling Methods 0.000 claims abstract description 53
- 239000000945 filler Substances 0.000 claims abstract description 34
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 30
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 30
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000011230 binding agent Substances 0.000 claims abstract description 28
- 239000011268 mixed slurry Substances 0.000 claims abstract description 26
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000440 bentonite Substances 0.000 claims abstract description 25
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 25
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 25
- 239000011651 chromium Substances 0.000 claims abstract description 25
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims abstract description 25
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 25
- 239000000839 emulsion Substances 0.000 claims abstract description 22
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims abstract description 22
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 229910052582 BN Inorganic materials 0.000 claims description 19
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 18
- VVNXEADCOVSAER-UHFFFAOYSA-N lithium sodium Chemical compound [Li].[Na] VVNXEADCOVSAER-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 9
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 239000004408 titanium dioxide Substances 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 239000004115 Sodium Silicate Substances 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 10
- 235000012239 silicon dioxide Nutrition 0.000 description 7
- 230000005855 radiation Effects 0.000 description 6
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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Abstract
The invention belongs to the technical field of heating furnace radiators, and provides a high-radiance energy-saving radiator of a heating furnace, which comprises the following components in parts by mass: 20-30 parts of silicon carbide, 40-55 parts of filler, 15-20 parts of strontium titanate, 1-2 parts of chromium boride, 4-10 parts of aluminum nitride, 8-15 parts of zirconium dioxide, 8-10 parts of bentonite, 3-6 parts of binder and 40-50 parts of styrene-acrylic emulsion. Grinding silicon carbide, filler, strontium titanate, chromium boride, aluminum nitride, zirconium dioxide and bentonite to the fineness of 50-100 meshes, and then sequentially adding a binder and a styrene-acrylic emulsion to obtain mixed slurry; and heating the mixed slurry to 1200-1300 ℃ for primary firing, 1500-1700 ℃ for secondary firing, cooling to 800 ℃ for heat preservation for 3-6h, and finally cooling to room temperature to obtain the high-radiance energy-saving radiator of the heating furnace. Through the technical scheme, the problems that the heating furnace high-radiance energy-saving radiator in the prior art is poor in thermal stability and easy to deform or crack are solved.
Description
Technical Field
The invention belongs to the technical field of heating furnace radiators, and relates to a high-radiance energy-saving radiator of a heating furnace and a preparation method thereof.
Background
In China, the energy consumption of the industrial kiln accounts for about 60 percent of national industrial energy consumption and accounts for 25 percent of national total energy consumption. However, the average thermal efficiency of the industrial kiln in China is less than 30%, and the average thermal efficiency of the industrial kiln in China is more than 50%. Therefore, energy saving of industrial kilns has considerable potential. The energy-saving method and the energy-saving technology of the existing industrial kiln mainly comprise an efficient combustion technology, waste heat recovery and utilization, a new furnace type structure, infrared radiation matrix improvement and the like. The improvement of the infrared radiation matrix is used as a new energy-saving technology in the industrial kiln, good energy-saving effect can be achieved when the infrared radiation matrix is applied in the industrial kiln, the service life of the industrial kiln can be prolonged, the maintenance workload of the kiln can be reduced, and the operation cost of the industrial kiln can be reduced. In addition, the radiation heat transfer in the furnace is strengthened, the temperature uniformity of heating in the furnace is improved, the heat efficiency of the furnace and the heating quality of products are improved, and the furnace is attracted by people. Therefore, the high-radiance energy-saving radiator of the heating furnace is used as a new material in energy saving of industrial kilns, and has strong vitality and wide application prospect.
However, with the rapid development of industry, people put higher demands on the radiation performance of the high-emissivity energy-saving radiator of the existing heating furnace, and because the working environment of the high-emissivity energy-saving radiator of the heating furnace is a high-temperature industrial furnace, the high-emissivity energy-saving radiator of the heating furnace has the defects of poor thermal stability and easy deformation or cracking after long-term use, even the high-emissivity energy-saving radiator of the heating furnace is scrapped, thereby greatly influencing the production and economic benefits of the industrial furnace.
Disclosure of Invention
The invention provides a high-radiance energy-saving radiator of a heating furnace and a preparation method thereof, which solve the problems of poor thermal stability and easy deformation or cracking of the high-radiance energy-saving radiator of the heating furnace in the prior art.
The technical scheme of the invention is realized as follows:
a high-radiance energy-saving radiator of a heating furnace comprises the following components in parts by mass: 20-30 parts of silicon carbide, 40-55 parts of filler, 15-20 parts of strontium titanate, 1-2 parts of chromium boride, 4-10 parts of aluminum nitride, 8-15 parts of zirconium dioxide, 8-10 parts of bentonite, 3-6 parts of binder and 40-50 parts of styrene-acrylic emulsion.
A preparation method of a high-radiance energy-saving radiator of a heating furnace comprises the following steps:
A. weighing each component according to the formula of the high-radiance energy-saving radiator of the heating furnace for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide and the bentonite weighed in the step A to the fineness of 50-100 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1200-1300 ℃ for primary firing, continuing heating to 1500-1700 ℃ for secondary firing after firing for 24-36h, performing secondary firing for 15-20h, preserving heat for 3-4h, then cooling to 800 ℃ for preserving heat for 3-6h, and finally cooling to room temperature to obtain the high-emissivity energy-saving radiator of the heating furnace.
Further, the lithium niobate lithium ion battery also comprises 2-5 parts of lithium niobate sodium and 6-10 parts of boron nitride.
Further, the filler comprises 20-30 parts of ferric oxide, 10-12 parts of alumina, 5-10 parts of titanium dioxide, 8-15 parts of calcium oxide and 5-25 parts of silicon dioxide.
Further, the adhesive comprises sodium silicate and silica sol in a mass ratio of 1: 1.
Further, the coating comprises the following components in parts by mass: 25 parts of silicon carbide, 50 parts of filler, 18 parts of strontium titanate, 1 part of chromium boride, 5 parts of aluminum nitride, 9 parts of zirconium dioxide, 9 parts of bentonite, 6 parts of binder, 48 parts of styrene-acrylic emulsion, 3 parts of lithium sodium niobate and 8 parts of boron nitride.
Further, the filler comprises 25 parts of ferric oxide, 11 parts of aluminum oxide, 8 parts of titanium dioxide, 12 parts of calcium oxide and 20 parts of silicon dioxide.
A preparation method of a high-radiance energy-saving radiator of a heating furnace comprises the following steps:
A. weighing each component for later use according to the formula of the high-radiance energy-saving radiator of the heating furnace;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide, the bentonite, the lithium sodium niobate and the boron nitride weighed in the step A to the fineness of 50-100 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1200-1300 ℃ for primary firing, continuing heating to 1500-1700 ℃ for secondary firing after firing for 24-36h, performing secondary firing for 15-20h, preserving heat for 3-4h, then cooling to 800 ℃ for preserving heat for 3-6h, and finally cooling to room temperature to obtain the high-emissivity energy-saving radiator of the heating furnace.
The preparation method of the high-radiance energy-saving radiator of the heating furnace comprises the following steps:
further, the heating rate of the first firing in the step C is 10-15 ℃/min, and the heating rate of the second firing is 30-50 ℃/min.
Further, in the process of cooling to 800 ℃ in the step C, the cooling rate is 5-8 ℃/min; the cooling rate of cooling to room temperature is 15-25 ℃/min.
The working principle and the beneficial effects of the invention are as follows:
1. according to the invention, by reasonably optimizing the design of the formula of the high-emissivity energy-saving radiator of the heating furnace and combining with the precise parameter control of the preparation firing method, the refractoriness of the prepared high-emissivity energy-saving radiator of the heating furnace is 2280-2425 ℃, the high-emissivity energy-saving radiator of the heating furnace is heated to 1600 ℃, and then the high-emissivity energy-saving radiator of the heating furnace is placed in water at room temperature for quenching 81-105 times, so that the high-emissivity energy-saving radiator of the heating furnace has cracks, the emissivity is 0.98-0.99, the rupture strength is 308-311MPa, and the problems of poor thermal stability and easy deformation or cracking of the high-emissivity energy-saving radiator of the heating furnace in the prior art are solved.
2. According to the invention, strontium titanate, zirconium dioxide, silicon carbide, filler, chromium boride, aluminum nitride and bentonite are compounded, so that the refractoriness and thermal stability of the high-emissivity energy-saving radiator of the heating furnace are improved, the high-emissivity energy-saving radiator is not easy to deform or crack after long-term use, and the emissivity performance is improved; on the basis, the added lithium sodium niobate and boron nitride are compounded and cooperated, so that the refractoriness and the thermal stability of the high-radiance energy-saving radiator of the heating furnace are further improved.
3. The preparation method of the high-radiance energy-saving radiator of the heating furnace adopts a twice firing method: the heating rate of the first firing is 10-15 ℃/min, after the firing is carried out for 24-36h, the temperature is continuously raised to 1500-1700 ℃ for the second firing, the heating rate of the second firing is 30-50 ℃/min, the second firing is 15-20h, and the heat preservation is carried out for 3-4 h.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example 1
A high-radiance energy-saving radiator of a heating furnace comprises the following components in parts by mass: 20 parts of silicon carbide, 55 parts of filler, 15 parts of strontium titanate, 2 parts of chromium boride, 4 parts of aluminum nitride, 15 parts of zirconium dioxide, 8 parts of bentonite, 6 parts of binder and 40 parts of styrene-acrylic emulsion; the binder comprises sodium silicate and silica sol in a mass ratio of 1: 1; the filler comprises 30 parts of ferric oxide, 10 parts of alumina, 10 parts of titanium dioxide, 8 parts of calcium oxide and 25 parts of silicon dioxide.
A preparation method of a high-radiance energy-saving radiator of a heating furnace comprises the following steps:
A. weighing each component according to the formula of the high-radiance energy-saving radiator of the heating furnace for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide and the bentonite weighed in the step A to the fineness of 50 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1300 ℃ for primary firing, wherein the heating rate of the primary firing is 10 ℃/min, after 36h of firing, continuously heating to 1500 ℃ for secondary firing, the heating rate of the secondary firing is 50 ℃/min, the secondary firing is 15h, keeping the temperature for 4h, then cooling to 800 ℃ and keeping the temperature for 3h, and in the process of cooling to 800 ℃, the cooling rate is 8 ℃/min, and finally cooling to room temperature by adopting the cooling rate of 15 ℃/min to obtain the high-radiance energy-saving radiator of the heating furnace.
Example 2
A high-radiance energy-saving radiator of a heating furnace comprises the following components in parts by mass: 30 parts of silicon carbide, 40 parts of filler, 20 parts of strontium titanate, 1 part of chromium boride, 10 parts of aluminum nitride, 8 parts of zirconium dioxide, 10 parts of bentonite, 3 parts of binder and 50 parts of styrene-acrylic emulsion; the binder comprises sodium silicate and silica sol in a mass ratio of 1: 1; the filler comprises 20 parts of ferric oxide, 12 parts of alumina, 5 parts of titanium dioxide, 15 parts of calcium oxide and 5 parts of silicon dioxide.
A preparation method of a high-radiance energy-saving radiator of a heating furnace comprises the following steps:
A. weighing each component according to the formula of the high-radiance energy-saving radiator of the heating furnace for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide and the bentonite weighed in the step A to the fineness of 100 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1200 ℃ for primary firing, wherein the heating rate of the primary firing is 15 ℃/min, after firing for 24 hours, continuing to heat to 1700 ℃ for secondary firing, the heating rate of the secondary firing is 30 ℃/min, the secondary firing is 20 hours, preserving heat for 3 hours, then cooling to 800 ℃ and preserving heat for 6 hours, and in the process of cooling to 800 ℃, the cooling rate is 5 ℃/min, and finally cooling to room temperature by adopting the cooling rate of 25 ℃/min to obtain the high-radiance energy-saving radiator of the heating furnace.
Example 3
A high-radiance energy-saving radiator of a heating furnace comprises the following components in parts by mass: 20 parts of silicon carbide, 40 parts of filler, 20 parts of strontium titanate, 2 parts of chromium boride, 4 parts of aluminum nitride, 8 parts of zirconium dioxide, 10 parts of bentonite, 6 parts of binder, 40 parts of styrene-acrylic emulsion, 2 parts of sodium lithium niobate and 10 parts of boron nitride; the binder comprises sodium silicate and silica sol in a mass ratio of 1: 1; the filler comprises 30 parts of ferric oxide, 10 parts of alumina, 5 parts of titanium dioxide, 15 parts of calcium oxide and 25 parts of silicon dioxide.
A preparation method of a high-radiance energy-saving radiator of a heating furnace comprises the following steps:
A. weighing each component according to the formula of the high-radiance energy-saving radiator of the heating furnace for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide, the bentonite, the lithium sodium niobate and the boron nitride weighed in the step A to the fineness of 80 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1200 ℃ for primary firing, wherein the heating rate of the primary firing is 10 ℃/min, after 36h of firing, continuously heating to 1700 ℃ for secondary firing, the heating rate of the secondary firing is 30 ℃/min, the secondary firing is 15h, keeping the temperature for 4h, then cooling to 800 ℃ and keeping the temperature for 6h, cooling to 800 ℃ in the process, wherein the cooling rate is 5 ℃/min, and finally cooling to room temperature by adopting the cooling rate of 15 ℃/min to obtain the high-radiance energy-saving radiator of the heating furnace.
Example 4
A high-radiance energy-saving radiator of a heating furnace comprises the following components in parts by mass: 25 parts of silicon carbide, 50 parts of filler, 18 parts of strontium titanate, 1 part of chromium boride, 5 parts of aluminum nitride, 9 parts of zirconium dioxide, 9 parts of bentonite, 6 parts of binder, 48 parts of styrene-acrylic emulsion, 3 parts of lithium sodium niobate and 8 parts of boron nitride; the binder comprises sodium silicate and silica sol in a mass ratio of 1: 1; the filler comprises 25 parts of ferric oxide, 11 parts of aluminum oxide, 8 parts of titanium dioxide, 12 parts of calcium oxide and 20 parts of silicon dioxide.
A preparation method of a high-radiance energy-saving radiator of a heating furnace comprises the following steps:
A. weighing each component according to the formula of the high-radiance energy-saving radiator of the heating furnace for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide, the bentonite, the lithium sodium niobate and the boron nitride weighed in the step A to the fineness of 100 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1250 ℃ for primary firing, wherein the heating rate of the primary firing is 12 ℃/min, after firing for 30h, continuously heating to 1600 ℃ for secondary firing, the heating rate of the secondary firing is 40 ℃/min, the secondary firing is 18h, heat preservation is carried out for 3.5h, then cooling to 800 ℃ and heat preservation is carried out for 5h, in the process of cooling to 800 ℃, the cooling rate is 7 ℃/min, and finally, the cooling rate of 20 ℃/min is adopted to cool to room temperature, so that the high-emissivity energy-saving radiator of the heating furnace is obtained.
Example 5
A high-radiance energy-saving radiator of a heating furnace comprises the following components in parts by mass: 30 parts of silicon carbide, 55 parts of filler, 15 parts of strontium titanate, 1 part of chromium boride, 10 parts of aluminum nitride, 15 parts of zirconium dioxide, 8 parts of bentonite, 3 parts of binder, 50 parts of styrene-acrylic emulsion, 5 parts of lithium sodium niobate and 6 parts of boron nitride; the binder comprises sodium silicate and silica sol in a mass ratio of 1: 1; the filler comprises 20 parts of ferric oxide, 10 parts of alumina, 10 parts of titanium dioxide, 15 parts of calcium oxide and 5 parts of silicon dioxide.
A preparation method of a high-radiance energy-saving radiator of a heating furnace comprises the following steps:
A. weighing each component according to the formula of the high-radiance energy-saving radiator of the heating furnace for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide, the bentonite, the lithium sodium niobate and the boron nitride weighed in the step A to the fineness of 50 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1300 ℃ for primary firing, wherein the heating rate of the primary firing is 15 ℃/min, after firing for 24h, continuing to heat to 1500 ℃ for secondary firing, the heating rate of the secondary firing is 50 ℃/min, the secondary firing is 20h, keeping the temperature for 3h, then cooling to 800 ℃ and keeping the temperature for 3h, cooling to 800 ℃ in the process, wherein the cooling rate is 8 ℃/min, and finally cooling to room temperature by adopting the cooling rate of 25 ℃/min to obtain the high-radiance energy-saving radiator of the heating furnace.
Example 6
Compared with the example 1, the difference is that 4 parts of lithium sodium niobate and 7 parts of boron nitride are included in the formula of the high-radiance energy-saving radiator of the heating furnace;
a preparation method of a high-radiance energy-saving radiator of a heating furnace comprises the following steps:
A. weighing each component according to the formula of the high-radiance energy-saving radiator of the heating furnace for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide, the bentonite, the lithium sodium niobate and the boron nitride weighed in the step A to the fineness of 50 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1300 ℃ for primary firing, wherein the heating rate of the primary firing is 10 ℃/min, after 36h of firing, continuously heating to 1500 ℃ for secondary firing, the heating rate of the secondary firing is 50 ℃/min, the secondary firing is 15h, keeping the temperature for 4h, then cooling to 800 ℃ and keeping the temperature for 3h, and in the process of cooling to 800 ℃, the cooling rate is 8 ℃/min, and finally cooling to room temperature by adopting the cooling rate of 15 ℃/min to obtain the high-radiance energy-saving radiator of the heating furnace.
Example 7
The only difference compared to example 6 is that no lithium sodium niobate was added.
Example 8
The only difference compared to example 6 is that no boron nitride was added.
Comparative example 1
The only difference compared to example 1 is that strontium titanate and zirconium dioxide are not added.
Comparative example 2
The difference compared to example 1 is only that strontium titanate is not added.
Comparative example 3
The only difference compared with example 1 is that no zirconium dioxide is added.
Comparative example 4
Compared to example 4, the difference is only in step C: and C, heating the mixed slurry obtained in the step B to 1600 ℃ for firing, wherein the firing heating rate is 40 ℃/min, the firing time is 18h, the heat preservation time is 3.5h, then, cooling to 800 ℃, the heat preservation time is 5h, in the process of cooling to 800 ℃, the cooling rate is 7 ℃/min, and finally, the cooling rate of 20 ℃/min is adopted to cool to the room temperature, so that the high-radiance energy-saving radiator of the heating furnace is obtained.
The high-emissivity energy-saving radiators in the examples 1 to 8 and the comparative examples 1 to 4 were measured for refractoriness, thermal stability, durability, emissivity, aging resistance, and service life, and the measurement method and the measurement results were as follows:
1. degree of refractoriness
According to the test method of the refractoriness of the GB/T7322 and 2017 refractory materials.
2. Thermal stability
Heating the high-emissivity energy-saving radiator of the heating furnace to 1600 ℃, then placing the high-emissivity energy-saving radiator in water at room temperature for quenching, recording the quenching times when the high-emissivity energy-saving radiator of the heating furnace has cracks, and using the quenching times as an index to compare and judge the thermal stability of the high-emissivity energy-saving radiator of the heating furnace.
3. Emissivity of radiation
The emissivity was measured using an emissivity tester according to ASTM C1371 for a furnace high emissivity energy saving radiator according to ASTM C1371 procedure.
4. Flexural strength
And (4) determining the rupture strength of the high-radiance energy-saving radiator of the heating furnace according to a normal-temperature rupture strength test method of the GBT 3001-2017 refractory material.
TABLE 1 Performance data for examples 1-8 and comparative examples 1-4
As can be seen from the above table 1, the refractoriness of the high-emissivity energy-saving radiator of the heating furnace obtained by the formula and the preparation method is 2280-2425 ℃, the high-emissivity energy-saving radiator of the heating furnace is heated to 1600 ℃, then the heating furnace is placed in water at room temperature for quenching 81-105 times, cracks only appear on the high-emissivity energy-saving radiator of the heating furnace, the emissivity is 0.98-0.99, and the breaking strength is 308-311MPa, wherein strontium titanate and zirconium dioxide are adopted to compound with other components in the example 1, while strontium titanate and zirconium dioxide are not adopted in the comparative example 1, strontium titanate and zirconium dioxide are adopted separately or compounded with other components in the comparative examples 2 and 3, and the refractoriness, thermal stability and emissivity of the prepared high-emissivity energy-saving radiator of the heating furnace are all reduced, and the refractoriness, thermal stability and emissivity of the heating furnace are all reduced by adopting strontium titanate, zirconium dioxide, silicon carbide, filler, chromium boride and the invention, The aluminum nitride and the bentonite are compounded, so that the refractoriness and the thermal stability of the high-radiance energy-saving radiator of the heating furnace are improved, and meanwhile, the radiance is improved.
In the embodiment 6, lithium sodium niobate and boron nitride are compounded with strontium titanate, zirconium dioxide, silicon carbide, filler, chromium boride, aluminum nitride and bentonite, while in the embodiment 1, lithium sodium niobate and boron nitride are not added, and in the embodiments 7 and 8, lithium sodium niobate or boron nitride are independently adopted, so that the refractoriness and thermal stability of the prepared heating furnace high-emissivity energy-saving radiator are reduced.
The preparation method in the comparative example 4 directly heats the mixed slurry obtained in the step B to 1600 ℃ for firing, the heating rate of firing is 40 ℃/min, the firing time is 18h, and the heat preservation time is 3.5h, while the method of twice firing is adopted in the example 4: the heating rate of the first firing is 10-15 ℃/min, after the firing is carried out for 24-36h, the temperature is continuously raised to 1500-1700 ℃ for the second firing, the heating rate of the second firing is 30-50 ℃/min, the temperature of the second firing is 15-20h, and the temperature is kept for 3-4h, as can be seen from table 1, compared with example 4, the bending strength of the high-emissivity energy-saving radiator of the heating furnace prepared by the comparative example 4 is obviously reduced, and the bending strength of the high-emissivity energy-saving radiator of the heating furnace is unexpectedly improved by adopting the twice firing method in the invention.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-radiance energy-saving radiator of the heating furnace is characterized by comprising the following components in parts by mass: 20-30 parts of silicon carbide, 40-55 parts of filler, 15-20 parts of strontium titanate, 1-2 parts of chromium boride, 4-10 parts of aluminum nitride, 8-15 parts of zirconium dioxide, 8-10 parts of bentonite, 3-6 parts of binder and 40-50 parts of styrene-acrylic emulsion;
the preparation method of the high-radiance energy-saving radiator of the heating furnace comprises the following steps:
A. weighing each component for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide and the bentonite weighed in the step A to the fineness of 50-100 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1200-1300 ℃ for primary firing, continuing heating to 1500-1700 ℃ for secondary firing after firing for 24-36h, performing secondary firing for 15-20h, preserving heat for 3-4h, then cooling to 800 ℃ for preserving heat for 3-6h, and finally cooling to room temperature to obtain the high-emissivity energy-saving radiator of the heating furnace.
2. The high-emissivity energy-saving radiator of claim 1, further comprising 2-5 parts of lithium sodium niobate and 6-10 parts of boron nitride.
3. The high-emissivity energy-saving radiator of claim 1 or 2, wherein the filler comprises 20-30 parts of ferric oxide, 10-12 parts of alumina, 5-10 parts of titanium dioxide, 8-15 parts of calcium oxide, and 5-25 parts of silica.
4. The high-emissivity energy-saving radiator of claim 1 or 2, wherein the binder comprises sodium silicate and silica sol in a mass ratio of 1: 1.
5. The high-emissivity energy-saving radiator of claim 2, comprising, in parts by mass: 25 parts of silicon carbide, 50 parts of filler, 18 parts of strontium titanate, 1 part of chromium boride, 5 parts of aluminum nitride, 9 parts of zirconium dioxide, 9 parts of bentonite, 6 parts of binder, 48 parts of styrene-acrylic emulsion, 3 parts of lithium sodium niobate and 8 parts of boron nitride.
6. A high emissivity energy saving radiator of claim 5 wherein said filler comprises 25 parts ferric oxide, 11 parts alumina, 8 parts titanium dioxide, 12 parts calcium oxide, 20 parts silica.
7. The preparation method of the high-radiance energy-saving radiator of the heating furnace is characterized by comprising the following steps of:
A. the formula of the high-emissivity energy-saving radiator of the heating furnace according to claim 1, wherein the components are weighed for later use;
B. b, grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide and the bentonite weighed in the step A to the fineness of 50-100 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1200-1300 ℃ for primary firing, continuing heating to 1500-1700 ℃ for secondary firing after firing for 24-36h, performing secondary firing for 15-20h, preserving heat for 3-4h, then cooling to 800 ℃ for preserving heat for 3-6h, and finally cooling to room temperature to obtain the high-emissivity energy-saving radiator of the heating furnace.
8. The preparation method of the high-radiance energy-saving radiator of the heating furnace is characterized by comprising the following steps of:
A. the formula of the high-emissivity energy-saving radiator of any one of claims 2 to 6, wherein the components are weighed for later use;
B. grinding the silicon carbide, the filler, the strontium titanate, the chromium boride, the aluminum nitride, the zirconium dioxide, the bentonite, the lithium sodium niobate and the boron nitride weighed in the step A to the fineness of 50-100 meshes, and then sequentially adding the binder and the styrene-acrylic emulsion to obtain mixed slurry;
C. and C, heating the mixed slurry obtained in the step B to 1200-1300 ℃ for primary firing, continuing heating to 1500-1700 ℃ for secondary firing after firing for 24-36h, performing secondary firing for 15-20h, preserving heat for 3-4h, then cooling to 800 ℃ for preserving heat for 3-6h, and finally cooling to room temperature to obtain the high-emissivity energy-saving radiator of the heating furnace.
9. The method for manufacturing a high-emissivity energy-saving radiator of claim 7 or 8, wherein the first firing in step C has a heating rate of 10-15 ℃/min, and the second firing has a heating rate of 30-50 ℃/min.
10. The method for preparing a high-emissivity energy-saving radiator of a heating furnace according to claim 7 or 8, wherein in the process of cooling to 800 ℃ in the step C, the cooling rate is 5-8 ℃/min; the cooling rate of cooling to room temperature is 15-25 ℃/min.
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