CN108439963B - Circulating fluidized bed boiler water-cooled wall castable and preparation method thereof - Google Patents
Circulating fluidized bed boiler water-cooled wall castable and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a circulating fluidized bed boiler water wall castable and a preparation method thereof. The technical scheme is as follows: mixing the materials according to the mass ratio of the bauxite chamotte to the alumina sol of 100: 2-5, mixing, and storing at room temperature to obtain a premix; mixing brown corundum fine powder, magnesia alumina spinel fine powder, zirconium corundum fine powder, rho-alumina fine powder and silicon carbide fine powder according to the mass ratio of 100: 10-15: 2-5: 5-8: 3-6, and preparing fine powder; mixing the materials according to the mass ratio of the premix to the fine powder of 100: 35-40, and mixing to obtain a mixture; and adding silica sol accounting for 4-5 wt% of the mixture into the mixture, stirring, and ageing to obtain the circulating fluidized bed boiler water wall castable. The invention has simple process; the prepared castable for the water wall of the circulating fluidized bed boiler has the advantages of high strength, good thermal shock stability, high heat conductivity coefficient and good construction performance.
Description
Technical Field
The invention belongs to the technical field of circulating fluidized bed boiler castable. In particular to a circulating fluidized bed boiler water wall castable and a preparation method thereof.
Background
The circulating fluidized bed boiler is an efficient and clean combustion technology which is rapidly developed in recent ten years, and has the characteristics of high combustion rate, good desulfurization effect, high heat energy utilization rate and the like. However, in the high-temperature operation process of the circulating fluidized bed boiler, the water-cooled wall refractory material is also subjected to strong convective scouring and abrasion of solid fuel, flue gas, dust and the like to different degrees, and the service life of the water-cooled wall refractory material is seriously influenced.
At present, the circulating fluidized bed boiler water wall refractory material mainly adopts high-alumina refractory castable, which has good high temperature resistance, large strength and high wear resistance, but has the main defects that: firstly, the high-alumina refractory material has poor capability of resisting thermal stress circulation, poor thermal shock stability and easy structural stripping; secondly, the high-alumina refractory material has weaker heat-conducting property, thus hindering the heat transfer in the boiler and reducing the heat energy utilization rate of the circulating fluidized bed boiler; thirdly, the high-alumina refractory material is mostly combined by calcium aluminate cement, which not only reduces the high-temperature strength of the high-alumina refractory material, but also is difficult to control the hardening rate of the high-alumina refractory material, thereby influencing the construction.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and aims to provide a preparation method of a circulating fluidized bed boiler water wall castable with simple process; the circulating fluidized bed boiler water wall castable prepared by the method has the advantages of high strength, good thermal shock stability, high heat conductivity coefficient and good construction performance.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following specific steps:
step one, mixing the bauxite clinker and the alumina sol for 3-5 minutes according to the mass ratio of the bauxite clinker to the alumina sol being 100: 2-5, and storing for 30-40 minutes at room temperature to obtain the premix.
And secondly, adding the brown fused alumina fine powder, the magnesia alumina spinel fine powder, the zirconium corundum fine powder and the silicon carbide fine powder into a stirrer, and mixing for 5-8 minutes to obtain fine powder, wherein the mass ratio of the brown fused alumina fine powder to the magnesium alumina spinel fine powder to the zirconium corundum fine powder to the rho-alumina fine powder to the silicon carbide fine powder is 100: 10-15: 2-5: 5-8: 3-6.
And step three, adding the fine powder into the premix according to the mass ratio of the premix to the fine powder of 100: 35-40, and mixing for 5-6 minutes to obtain a mixture.
And step four, adding silica sol accounting for 4-5 wt% of the mixture into the mixture, stirring for 3-5 minutes, and ageing for 2-3 minutes to obtain the circulating fluidized bed boiler water wall castable.
The bauxite chamotte comprises the following main chemical components: al (Al)2O380-85 wt% of SiO210-12 wt% of Fe2O3The content is less than or equal to 1 wt%; the particle size of the bauxite chamotte is 0.1-6 mm.
Al of the aluminum sol2O3The content is 8-10 wt%.
Al of the brown corundum fine powder2O3The content is more than or equal to 98 wt%; the particle size of the brown corundum fine powder is 60-80 mu m.
The magnesium aluminate spinel fine powder mainly comprises the following chemical components: MgO content of 20-30 wt%, Al2O3The content is 60-70 wt%; the particle size of the magnesia-alumina spinel fine powder is 50-70 mu m.
The zirconia corundum fine powder comprises the following main chemical components: al (Al)2O390-95 wt% of ZrO2The content is 3-5 wt%; the granularity of the zirconia corundum fine powder is 40-60 mu m.
Al of the rho-alumina fine powder2O3The content is more than or equal to 99 wt%; the particle size of the rho-alumina fine powder is 40-60 mu m.
The SiC content of the silicon carbide fine powder is more than or equal to 98 wt%; the granularity of the silicon carbide fine powder is 40-60 mu m.
SiO of the silica sol2The content is 10-15 wt%.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
1. the circulating fluidized bed boiler water-cooled wall castable is obtained only by mixing and ageing the components according to the mass ratio, and the preparation process is simple without special equipment and complex technical means.
2. The invention adopts cement-free combination, and improves the construction performance of the circulating fluidized bed boiler water-cooling wall castable.
3. The invention mixes the mixture and the silica sol uniformly, and the mixture is stranded, thereby enhancing the combination property of the components of the raw materials and improving the strength of the castable for the water wall of the circulating fluidized bed boiler.
4. According to the invention, the introduction of the silicon carbide fine powder is utilized to improve the heat conductivity of the circulating fluidized bed boiler water-cooling wall castable, and the strength and the thermal shock stability of the circulating fluidized bed boiler water-cooling wall castable are improved by combining the secondary spinel reaction of the magnesium aluminate spinel fine powder and the oxidation-solid solution reaction of the silicon carbide fine powder.
The circulating fluidized bed boiler water wall castable prepared by the invention is determined as follows: the normal-temperature compressive strength is 40-45 MPa; the thermal conductivity is 7.5-8.0 W.m-1·K-1(ii) a The retention rate of the residual strength of the 1100 ℃ water-cooling primary thermal shock stability experiment is 89-94%.
Therefore, the invention has simple process; the prepared castable for the water wall of the circulating fluidized bed boiler has the advantages of high strength, good thermal shock stability, high heat conductivity coefficient and good construction performance.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In order to avoid repetition, the materials related to this specific embodiment are described in a unified manner, which is not described in the embodiments again:
the bauxite chamotte comprises the following main chemical components: al (Al)2O380-85 wt% of SiO210-12 wt% of Fe2O3The content is less than or equal to 1 wt%; the particle size of the bauxite chamotte is 0.1-6 mm.
Al of the aluminum sol2O3The content is 8-10 wt%.
Al of the brown corundum fine powder2O3The content is more than or equal to 98 wt%; the particle size of the brown corundum fine powder is 60-80 mu m.
The magnesium aluminate spinel fine powder mainly comprises the following chemical components: MgO content of 20-30 wt%, Al2O3The content is 60-70 wt%; the particle size of the magnesia-alumina spinel fine powder is 50-70 mu m.
The zirconia corundum fine powder comprises the following main chemical components: al (Al)2O390-95 wt% of ZrO2The content is 3-5 wt%; the granularity of the zirconia corundum fine powder is 40-60 mu m.
Al of the rho-alumina fine powder2O3The content is more than or equal to 99 wt%; the particle size of the rho-alumina fine powder is 40-60 mu m.
The SiC content of the silicon carbide fine powder is more than or equal to 98 wt%; the granularity of the silicon carbide fine powder is 40-60 mu m.
SiO of the silica sol2The content is 10-15 wt%.
Example 1
A circulating fluidized bed boiler water wall castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, mixing the bauxite clinker and the alumina sol for 3-5 minutes according to the mass ratio of the bauxite clinker to the alumina sol being 100: 2-4, and storing for 30-40 minutes at room temperature to obtain the premix.
And secondly, adding the brown fused alumina fine powder, the magnesia alumina spinel fine powder, the zirconium corundum fine powder and the silicon carbide fine powder into a stirrer, and mixing for 5-8 minutes to obtain fine powder, wherein the mass ratio of the brown fused alumina fine powder to the magnesium aluminate spinel fine powder to the zirconium corundum fine powder to the rho-alumina fine powder to the silicon carbide fine powder is 100: 10-12: 2-4: 5-7: 3-5.
And step three, adding the fine powder into the premix according to the mass ratio of the premix to the fine powder of 100: 35-37, and mixing for 5-6 minutes to obtain a mixture.
And step four, adding silica sol accounting for 4-5 wt% of the mixture into the mixture, stirring for 3-5 minutes, and ageing for 2-3 minutes to obtain the circulating fluidized bed boiler water wall castable.
The circulating fluidized bed boiler water wall castable prepared by the specific embodiment is determined by the following steps: the normal-temperature compressive strength is 40-42 MPa; the thermal conductivity coefficient is 7.5 to 7.7 W.m-1·K-1(ii) a The retention rate of the residual strength of the 1100 ℃ water-cooling primary thermal shock stability experiment is 89-91%.
Example 2
A circulating fluidized bed boiler water wall castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, mixing the bauxite clinker and the alumina sol for 3-5 minutes according to the mass ratio of the bauxite clinker to the alumina sol being 100: 2-4, and storing for 30-40 minutes at room temperature to obtain the premix.
And secondly, adding the brown fused alumina fine powder, the magnesia alumina spinel fine powder, the zirconium corundum fine powder and the silicon carbide fine powder into a stirrer, and mixing for 5-8 minutes to obtain fine powder, wherein the mass ratio of the brown fused alumina fine powder to the magnesium aluminate spinel fine powder to the zirconium corundum fine powder to the rho-alumina fine powder to the silicon carbide fine powder is 100: 11-13: 2-4: 5-7: 3-5.
And step three, adding the fine powder into the premix according to the mass ratio of the premix to the fine powder of 100: 36-38, and mixing for 5-6 minutes to obtain a mixture.
And step four, adding silica sol accounting for 4-5 wt% of the mixture into the mixture, stirring for 3-5 minutes, and ageing for 2-3 minutes to obtain the circulating fluidized bed boiler water wall castable.
The circulating fluidized bed boiler water wall castable prepared by the specific embodiment is determined by the following steps: the normal-temperature compressive strength is 41-43 MPa; the thermal conductivity coefficient is 7.6-7.8 W.m-1·K-1(ii) a The retention rate of the residual strength of the 1100 ℃ water-cooling primary thermal shock stability experiment is 90-92%.
Example 3
A circulating fluidized bed boiler water wall castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, mixing the bauxite clinker and the alumina sol for 3-5 minutes according to the mass ratio of the bauxite clinker to the alumina sol being 100: 3-5, and storing for 30-40 minutes at room temperature to obtain the premix.
And secondly, adding the brown fused alumina fine powder, the magnesia alumina spinel fine powder, the zirconium corundum fine powder and the silicon carbide fine powder into a stirrer, and mixing for 5-8 minutes to obtain fine powder, wherein the mass ratio of the brown fused alumina fine powder to the magnesium aluminate spinel fine powder to the zirconium corundum fine powder to the rho-alumina fine powder to the silicon carbide fine powder is 100: 12-14: 3-5: 6-8: 4-6.
And step three, adding the fine powder into the premix according to the mass ratio of the premix to the fine powder of 100: 37-39, and mixing for 5-6 minutes to obtain a mixture.
And step four, adding silica sol accounting for 4-5 wt% of the mixture into the mixture, stirring for 3-5 minutes, and ageing for 2-3 minutes to obtain the circulating fluidized bed boiler water wall castable.
The circulating fluidized bed boiler water wall castable prepared by the specific embodiment is determined by the following steps: the normal-temperature compressive strength is 42-44 MPa; the thermal conductivity coefficient is 7.7-7.9 W.m-1·K-1(ii) a 1100 ℃ water cooling one-time thermal shock stability experiment residueThe strength retention ratio is 91 to 93%.
Example 4
A circulating fluidized bed boiler water wall castable and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
step one, mixing the bauxite clinker and the alumina sol for 3-5 minutes according to the mass ratio of the bauxite clinker to the alumina sol being 100: 3-5, and storing for 30-40 minutes at room temperature to obtain the premix.
And secondly, adding the brown fused alumina fine powder, the magnesia alumina spinel fine powder, the zirconium corundum fine powder and the silicon carbide fine powder into a stirrer, and mixing for 5-8 minutes to obtain fine powder, wherein the mass ratio of the brown fused alumina fine powder to the magnesium aluminate spinel fine powder to the zirconium corundum fine powder to the rho-alumina fine powder to the silicon carbide fine powder is 100: 13-15: 3-5: 6-8: 4-6.
And step three, adding the fine powder into the premix according to the mass ratio of the premix to the fine powder of 100: 38-40, and mixing for 5-6 minutes to obtain a mixture.
And step four, adding silica sol accounting for 4-5 wt% of the mixture into the mixture, stirring for 3-5 minutes, and ageing for 2-3 minutes to obtain the circulating fluidized bed boiler water wall castable.
The circulating fluidized bed boiler water wall castable prepared by the specific embodiment is determined by the following steps: the normal-temperature compressive strength is 43-45 MPa; the thermal conductivity coefficient is 7.8-8.0 W.m-1·K-1(ii) a The retention rate of the residual strength of the 1100 ℃ water-cooling primary thermal shock stability experiment is 92-94%.
Compared with the prior art, the specific implementation mode has the following positive effects:
1. according to the specific embodiment, the circulating fluidized bed boiler water-cooled wall castable is obtained only by mixing and ageing the components according to the mass ratio, special equipment and complex technical means are not needed, and the preparation process is simple.
2. The concrete embodiment adopts cement-free combination, and improves the construction performance of the castable for the water wall of the circulating fluidized bed boiler.
3. According to the embodiment, the mixture and the silica sol are uniformly stirred and stranded, the combination property of the components of the raw materials is enhanced, and the strength of the circulating fluidized bed boiler water wall castable is improved.
4. In the embodiment, the introduction of the silicon carbide fine powder is utilized to improve the heat conducting property of the castable material for the water cooling wall of the circulating fluidized bed boiler, and the strength and the thermal shock stability of the castable material for the water cooling wall of the circulating fluidized bed boiler are improved by combining the secondary spinel reaction of the magnesia-alumina spinel fine powder and the oxidation-solid solution reaction of the silicon carbide fine powder.
The circulating fluidized bed boiler water wall castable prepared by the specific embodiment is determined by the following steps: the normal-temperature compressive strength is 40-45 MPa; the thermal conductivity is 7.5-8.0 W.m-1·K-1(ii) a The retention rate of the residual strength of the 1100 ℃ water-cooling primary thermal shock stability experiment is 89-94%.
Therefore, the specific implementation method has simple process; the prepared castable for the water wall of the circulating fluidized bed boiler has the advantages of high strength, good thermal shock stability, high heat conductivity coefficient and good construction performance.
Claims (8)
1. A preparation method of a circulating fluidized bed boiler water wall castable is characterized by comprising the following specific steps:
step one, mixing the bauxite clinker and the alumina sol for 3-5 minutes according to the mass ratio of the bauxite clinker to the alumina sol being 100: 2-5, and storing for 30-40 minutes at room temperature to obtain a premix;
step two, adding brown corundum fine powder, magnesia alumina spinel fine powder, zirconium corundum fine powder and silicon carbide fine powder into a stirrer, and mixing for 5-8 minutes to obtain fine powder, wherein the mass ratio of the brown corundum fine powder to the magnesium aluminate spinel fine powder to the zirconium corundum fine powder to the rho-alumina fine powder to the silicon carbide fine powder is 100: 10-15: 2-5: 5-8: 3-6;
step three, adding the fine powder into the premix according to the mass ratio of the premix to the fine powder of 100: 35-40, and mixing for 5-6 minutes to obtain a mixture;
step four, adding silica sol which accounts for 4-5 wt% of the mixture into the mixture, stirring for 3-5 minutes, and ageing for 2-3 minutes to obtain the circulating fluidized bed boiler water wall castable;
al of the aluminum sol2O3The content is 8-10 wt%;
the magnesium aluminate spinel fine powder mainly comprises the following chemical components: MgO content of 20-30 wt%, Al2O3The content is 60-70 wt%; the particle size of the magnesia-alumina spinel fine powder is 50-70 mu m;
the granularity of the zirconia corundum fine powder is 40-60 mu m;
the granularity of the rho-alumina fine powder is 40-60 mu m;
the granularity of the silicon carbide fine powder is 40-60 mu m.
2. The method for preparing the castable for the water wall of the circulating fluidized bed boiler according to claim 1, wherein the main chemical components of the bauxite chamotte are as follows: al (Al)2O380-85 wt% of SiO210-12 wt% of Fe2O3The content is less than or equal to 1 wt%; the particle size of the bauxite chamotte is 0.1-6 mm.
3. The method for preparing the castable for the water wall of the circulating fluidized bed boiler according to claim 1, wherein the Al of the brown corundum fine powder2O3The content is more than or equal to 98 wt%; the particle size of the brown corundum fine powder is 60-80 mu m.
4. The method for preparing the castable for the water wall of the circulating fluidized bed boiler according to claim 1, wherein the zirconia corundum fine powder mainly comprises the following chemical components: al (Al)2O390-95 wt% of ZrO2The content is 3-5 wt%.
5. The method of preparing a circulating fluidized bed boiler water wall castable according to claim 1, wherein the p-oxidation is performedAl of fine aluminum powder2O3The content is more than or equal to 99 wt%.
6. The preparation method of the castable for the water wall of the circulating fluidized bed boiler according to claim 1, wherein the SiC content of the silicon carbide fine powder is not less than 98 wt%.
7. The method for preparing a circulating fluidized bed boiler water wall castable according to claim 1, wherein SiO of the silica sol2The content is 10-15 wt%.
8. A circulating fluidized bed boiler water wall castable, which is characterized by being prepared according to the preparation method of the circulating fluidized bed boiler water wall castable in any one of claims 1-7.
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| CN109053172A (en) * | 2018-09-13 | 2018-12-21 | 丁杨洋 | A kind of medium-frequency induction furnace Dry vibrating material and preparation method thereof and application method |
| CN110590346A (en) * | 2019-10-11 | 2019-12-20 | 林国强 | High-heat-conductivity wear-resistant material for circulating fluidized bed boiler |
| CN115584148A (en) * | 2022-08-30 | 2023-01-10 | 宜兴市国强炉业有限公司 | High-heat-conductivity high-strength composite material for flexibility transformation of circulating fluidized bed boiler and preparation method thereof |
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