CN104803692A - Corundum-mullite burnt brick applied to gas turbine combustion chamber and preparation method thereof - Google Patents
Corundum-mullite burnt brick applied to gas turbine combustion chamber and preparation method thereof Download PDFInfo
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- CN104803692A CN104803692A CN201510193496.3A CN201510193496A CN104803692A CN 104803692 A CN104803692 A CN 104803692A CN 201510193496 A CN201510193496 A CN 201510193496A CN 104803692 A CN104803692 A CN 104803692A
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Abstract
The invention relates to a refractory material for a gas turbine combustion chamber and discloses a corundum-mullite burnt brick. The corundum-mullite burnt brick is mainly obtained by high-temperature sintering of the following raw materials by mass percent at least: 30-40% of corundum particles, 35-45% of mullite particles and the balance of corundum fine powder and micro powder, wherein the fine powder and the micro powder have smaller granularity than the particles. Besides, the invention also discloses a method for sintering the corundum-mullite burnt brick and a corundum-mullite burnt brick obtained by application of the method. The obtained burnt brick is relatively high in strength, stable in performance and high in volume stability, the requirements for high strength and refractoriness, heat and shock resistance, corrosion resistance and scouring resistance in the gas turbine combustion chamber can be met and a relatively long service life is achieved.
Description
Technical field
The present invention relates to a kind of refractory materials for gas-turbine combustion chamber, particularly a kind of corundum-mullite burnt brick, the corundum-mullite burnt brick that a kind of method for firing above-mentioned corundum-mullite burnt brick and application aforesaid method obtain.
Background technology
Thermal power generation (thermal power generation) is the main source of Present Domestic normal power supplies, and it relies on steam turbine generating set, provides industry and civilian conventional power supply.And due to the needs of social development, gas-fired station is built larger and larger, and large installed capacity, super large installed capacity gas turbine application get more and more, the high temperature material selection requirements used gas-turbine combustion chamber, turbine etc. is also harsh gradually.Conventional aviation, boats and ships etc. use Small And Medium Capacity internal combustion turbine to adopt the superalloy with high-temperature oxidation resistant and resistance to combustion gas corrosion due to fuel gas temperature relatively low (600-1200 DEG C) more, as nickel-base alloy, and spray corresponding protective coating; And heavy single shift gas turbine flows out high-speed and high-temperature fuel gas temperature up to 1600-2000 DEG C by combustion zone; alloy cannot use under this condition of high temperature at all; therefore must build by laying bricks or stones and there is high refractoriness and strength flame resistant material is protected combustion chamber, with prolonging combustion room work-ing life.According to the feature of heavy duty gas turbine fuel, spray combustion, require that corresponding resistance to material is possessing under certain resistance to acid atmosphere erosion prerequisite, has higher refractoriness, excellent scour resistance and thermal shock resistance.Have in prior art with corundum and mullite as the burnt brick product obtained fired by raw material, but the shortcoming of the said products is, its intensity cannot meet the demands, in order to improve its intensity, still need and will add some impurity particles wherein, its resistivity against fire is declined to some extent.In addition, the stability of existing burnt brick is not high, and particularly when foreign matter content is higher, its less stable, in the environment of rapid heat cycle, easily causes burnt brick by problems such as furnace wall, combustion chamber come off.
Comprehensive each performance requriements, the present invention chooses the excellent mullite of the good and wear-resisting corundum of resistance to acid oxide erosion, thermal shock resistance as main raw material, burn till through high temperature and prepared a kind of corundum-mullite burnt brick, object is to provide a kind ofly to be possessed that intensity is higher and stable, good volume stability, meets the corundum-mullite burnt brick that heavy duty gas turbine combustion chamber uses.
Summary of the invention
The present invention is directed to the resistivity against fire of corundum-mullite burnt brick of the prior art, shortcoming that intensity, the overall target such as shock-resistant do not meet the demands, provide a kind of corundum-mullite burnt brick and corresponding preparation method, a kind of burnt brick meeting the environment for use of heavy duty gas turbine combustion chamber can be prepared, thus the work-ing life of prolonging combustion room.
For achieving the above object, the present invention can take following technical proposals:
A kind of corundum-mullite burnt brick, is at least obtained after batch mixing, shaping, high temperature sintering by following raw material, and described raw material has that mass percent is the corundum in granules of 30-40%, the mullite particle of 35-45%, surplus are corundum fine powder and active alpha-AL
2o
3micro mist, wherein, fine powder and micro mist have the less granularity of relative particle.Typically, also can comprise appropriate inorganic jointing compound, inorganic jointing compound is spent pulping liquor, Alumina gel, ρ-AL
2o
3or the one in aluminium dihydrogen phosphate, inorganic jointing compound add-on accounts for the 1.5-3.0% of corundum in granules, mullite particle and fine powder total mass.Wherein, the corundum-mullite burnt brick using above-mentioned raw materials to be fired into belongs to middle slant acidity refractory materials, there is the ability that opposing acid liquid or gaseous oxygen compound preferably corrode, for the high temperature containing elements such as N, S, P residual after the fuel combustion of heavy duty gas turbine spraying liquid, neutral sour gas, there is stronger erosion resistance.Aggregate adopts corundum and mullite, by inorganic jointing compound, can not introduce or only can introduce the impurity element of trace.Varigrained corundum in granules and mullite particle, and can be formed tightly packed between corundum fine powder, produce the structure having very high strength, various granularity corundum powder embeds the gap of macrobead corundum-mullite particle, not only can improve bulk strength by acceleration of sintering, also help the effective bonded area between adjustment corundum, mullite particle, especially in sintering process, corundum fine powder and active alpha-AL
2o
3micro mist can be clamp-oned between macrobead, and due to the friction between particle and squeezing action, effective contact area between raising particle that can be larger and matrix, greatly facilitate integrally-built intensity, order burn till after goods there is good intensity, wear resisting property and to cold and hot great tolerance, be enough to the erosive wear of high-temperature gas to lining material and the demand of rapid heat cycle that meet combustion chamber.
As the optional scheme of one; in the embodiment of the application; described corundum in granules is plate diamond spar particle or the plate diamond spar particle for being at least mixed with part white fused alumina particle; wherein; if corundum in granules is the plate diamond spar particle being mixed with part white fused alumina particle, then the content of white fused alumina particle at least should be greater than 0.In corundum in granules, mix a certain amount of white fused alumina, can increase the intensity of last finished product, according to statistics, adding of white fused alumina has considerable influence for the intensity under its high temperature, and different ratios is slightly different for intensity effect.Further the research of corundum-mullite burnt brick is found, not only the accumulation of varigrained corundum and corundum, corundum and mullite particle can improve its structural strength, the corundum of different structure, the such as accumulation of white fused alumina and plate diamond spar particle, also can improve its structure, because the price of white fused alumina and plate diamond spar is suitable, therefore both are admixed mutually, can substantially not improve on the basis of cost of burnt brick, improve its structural strength, effect is better.
As the optional scheme of one, in the embodiment of the application, described mullite can adopt 60 fused mullites or 72 electrofused mullites, its critical granularity is 2mm, adopt different mullites, slightly affect for the intensity under its high temperature, but by final experimental result, the selection of mullite is not the factor of final decision for the impact of intensity.
As the optional scheme of one, in the embodiment of the application, 10%, comparatively preferred scope that the mass percent of described white fused alumina particle at least accounts for raw material total mass is then 10-15% that the content of white fused alumina particle is the total mass per-cent of raw material.
As the optional scheme of one, in the embodiment of the application, described raw material also comprises the α-AL with composite grain that mass percent is 5-8%
2o
3, wherein, α-AL
2o
3median be at least 0.5 μm.
As the optional scheme of one, in the embodiment of the application, described in there is the α-AL of composite grain
2o
3median be at least one in 0.7 μm, 2 μm or 10 μm.
As the optional scheme of one, in the embodiment of the application, the granularity of described corundum fine powder is not more than 0.088mm.
As the optional scheme of one, in the embodiment of the application, the critical granularity of described corundum in granules and mullite particle is 2mm.
A kind of method firing above-mentioned corundum-mullite burnt brick, by described raw material after batch mixing, ageing mixture 1-3h, mechanical pressing, toast 12-24h under 120-200 DEG C of condition after, the goods after baking are made finished product burnt brick through 1550-1650 DEG C of condition thermal treatment 3-5h under air atmosphere.The corundum-mullite burnt brick be fired into by aforesaid method, its volume density is not less than 2.85g/m
3, apparent porosity is not more than 20% volume, and cold crushing strength is not less than 70MPa, and strength at normal temperature is not less than 10.0MPa, and the high temperature break resistant intensity especially at 1400 DEG C of temperature is not less than 10.0MPa, AL
2o
3content is not less than 86.0%wt, and the content of silicon-dioxide is not less than 8.0%wt, Fe
2o
3content be less than 0.30%wt, Na
2o content is less than 0.50%wt, and refractoriness is greater than 1800 DEG C.Find through experiment, larger association is there is in the resistance to elevated temperatures of burnt brick with its method for cooking, if method for cooking is improper, varigrained particle does not mix, and small size particle fails to embed completely in the gap of volume particle size particle, and in use procedure, one-piece construction stability is not high, local strength is low, after using one end time, easily produce local cracks, affect fire resistant quality.
A kind ofly apply above-mentioned method and fire the corundum-mullite burnt brick obtained.This burnt brick has good resistance to elevated temperatures, and its intensity and antiwear property are all better.Owing to adopting the granulated aggregate of different size, the aggregate of different size is fitted together to mutually, constitutes the great stable triangular structure of rigidity, but in actual sintering procedure, find that different proportionings can cause larger impact to its intensity and heat-resisting ability.In addition, the α-AL with composite grain activity is coordinated
2o
3micro mist, as sintering aids, without the need to adding mineralizer further, can reduce the contraction of product size in sintering process further.
The present invention has following remarkable technique effect:
The corundum-mullite burnt brick adopting technique scheme to prepare has good applied at elevated temperature performance; under high temperature, its volume change is little; can be affixed to merge with the shell of gas-turbine combustion chamber preferably and protect its shell; thus avoid surprisingly burning the gas leakage risk caused; extend the work-ing life of internal combustion turbine; there is good heat-proof quality simultaneously, effectively can reduce the calorific loss in combustion chamber, improve effciency of energy transfer.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
The proportioning raw materials used is: plate diamond spar particle, 15% white fused alumina particle, 35% mullite particle, 20% corundum fine powder and the 5% α-AL of 25% (mass percent, lower same)
2o
3micro mist, additional 2.5% Alumina gel.First add the mixing 2min of quantitative Alumina gel jointing compound by after corundum in granules material, mullite particle material mixed grind 1min, add the mixing 12-15min of the premixed powder be made up of corundum fine powder and alumina powder again and form pug, pug ageing mixture 2h aftershaping, 12h is toasted at 120 DEG C of temperature, under 1550 DEG C of air atmospheres after thermal treatment 5h, obtained corundum-mullite burnt brick.
Wherein, raw material use plate diamond spar particle and corundum fine powder in, AL
2o
3weight percent be greater than 99%, it is that 2.0mm and powder particle size are less than 0.088mm that granularity is respectively grain graininess; AL in white fused alumina particle
2o
3weight percent be greater than 98.5%, granularity 2.0mm; Mullite particle adopts 60 fused mullites, AL
2o
3weight percent is greater than 62%, granularity 2.0mm; Compound α-AL
2o
3micro mist then adopts meso-position radius to be respectively the different particle of 10 μm and 2 μm two kinds, and add-on is respectively 3% and 2%, AL in Alumina gel solution
2o
3it is 20% that content accounts for its mass percent, proportion 1.5g/cm3.
Corundum-mullite brick Indexs measure result prepared by this example is: apparent porosity 18.5%, volume density 2.85g/cm3, cold crushing strength 78.9MPa, strength at normal temperature 12.7MPa, 1400 DEG C of high temperature break resistant intensity 11.2MPa, AL
2o
3content 89.35%, dioxide-containing silica 9.13%, Fe in impurity
2o
3content 0.05%, Na
2o content 0.15%.
Embodiment 2
Proportioning raw materials is: 35% (mass percent, lower same) plate diamond spar particle, 37% mullite particle, 20% corundum fine powder and 8% α-AL
2o
3micro mist, additional 3.0% phosphate dihydrogen aluminum solution is as bonding agent.First add the mixing 2min of quantitative aluminium dihydrogen phosphate by after corundum in granules material, mullite particle material mixed grind 1min, add the mixing 12-15min of the premixed powder be made up of corundum fine powder and alumina powder again and obtain pug, by pug ageing mixture 3h aftershaping, 180 DEG C of baking 12h, under 1600 DEG C of air atmospheres after thermal treatment 3h, obtained corundum-mullite burnt brick.
Wherein, in plate diamond spar particle and corundum fine powder, AL
2o
3weight percent be greater than 99%, granularity is respectively plate diamond spar particle 2.0mm and corundum fine powder is less than or for 0.088mm; Mullite particle adopts 72 electrofused mullites, AL contained by it
2o
3weight percent is greater than 72%, granularity 2.0mm; Compound α-AL
2o
3the meso-position radius of micro mist is two specifications, and be respectively 2 μm and 0.7 μm, add-on is 4%, and the phosphate dihydrogen aluminum solution viscosity of use remains on 1.50-2.00PaS, and proportion is 1.70g/cm3.
The Indexs measure result of the corundum-mullite burnt brick prepared by the present embodiment is: apparent porosity 15.1%, volume density 2.96g/cm3, cold crushing strength 97.8MPa, strength at normal temperature 13.1MPa, 1400 DEG C of high temperature break resistant intensity 12.5MPa, AL
2o
3content 88.85%, dioxide-containing silica 9.02%, Fe in impurity
2o
3content is 0.04%, Na
2o content 0.14%.
Embodiment 3
Proportioning raw materials is: 25% (mass percent, lower same) plate diamond spar particle, 10% white fused alumina particle, 37% mullite particle, 17% corundum fine powder and 8% α-AL
2o
3micro mist, 3.0% ρ-AL
2o
3fine powder.First by corundum in granules material, mullite particle and by corundum fine powder, alumina powder and ρ-AL
2o
3the premixed powder of micro mist composition, mixed grind is even, after add the mixing 10-15min of 2% water, after mixing to pug particle with fine powder, pug ageing mixture 1h aftershaping, green compact are extremely dry through 100 DEG C of baking 12h, under 1650 DEG C of air atmospheres after thermal treatment 3h, obtained corundum-mullite burnt brick.
Wherein, the corundum in granules in vitrified brick and the AL of corundum fine powder
2o
3the weight percent of content is greater than 99%, grain graininess 2.0mm, and powder particle size is 0.088mm; AL in white fused alumina particle
2o
3weight percent is greater than 98.5%, granularity 2.0mm; Mullite particle adopts 72 electrofused mullites, its AL
2o
3the weight percent of content is greater than 72%, granularity 2.0mm; α-AL
2o
3the meso-position radius of micro mist has two specifications, and be respectively 10 μm and 2 μm, add-on is respectively 3% and 5%.
The Indexs measure result of corundum-mullite burnt brick prepared in the present embodiment is: apparent porosity 18.0%, volume density 2.85g/cm3, cold crushing strength 78.4MPa, strength at normal temperature 14.3MPa, 1400 DEG C of high temperature break resistant intensity 13.2MPa, AL
2o
3fe in content 90.03%, dioxide-containing silica 9.25%, impurity
2o
3content 0.05%, Na
2o content 0.17%.
Embodiment 4
Proportioning raw materials is: 35% (mass percent, lower same) plate diamond spar particle, 37% mullite particle, 20% corundum fine powder and 8% α-AL
2o
3micro mist, additional 1.5% spent pulping liquor makees bonding agent.First by corundum in granules material, mullite particle material premix 1min, after add 1.5% spent pulping liquor mixed grind 3min, add the premixed powder be made up of corundum fine powder and alumina powder again, mixed grind is about 10min, pug ageing mixture 2h aftershaping, green compact, through 180 DEG C of baking 12h, under 1600 DEG C of air atmospheres after thermal treatment 3h, obtain corundum-mullite burnt brick.
In burnt brick, the AL of corundum in granules and corundum fine powder
2o
3weight percent is greater than 99%, and the granularity 2.0mm of corundum in granules and the granularity of corundum fine powder are about 0.088mm; Mullite particle adopts 72 electrofused mullites, AL wherein
2o
3the weight percent of content is greater than 72%, granularity 2.0mm; Compound α-AL
2o
3the meso-position radius of micro mist has two specifications, and be respectively 2 μm and 0.7 μm, add-on is respectively 3% and 5%.Spent pulping liquor proportion 1.14g/cm3.
The Indexs measure result of the corundum-mullite burnt brick prepared by the present embodiment is: apparent porosity 15.5%, volume density 2.95g/cm3, cold crushing strength 73.0MPa, strength at normal temperature 12.7MPa, 1400 DEG C of high temperature break resistant intensity 10.7MPa, AL
2o
3fe in content 90.68%, dioxide-containing silica 9.02%, impurity
2o
3content 0.07%, Na
2o content 0.20%.
Embodiment 5
Proportioning raw materials is: 30% (mass percent, lower same) plate diamond spar particle, 38% mullite particle, 24% corundum fine powder and 8% α-AL
2o
3micro mist, additional 3% phosphate dihydrogen aluminum solution makees bonding agent.First by corundum in granules material, mullite particle material premix 1min, after add 3% phosphate dihydrogen aluminum solution mixed grind 3min, add by corundum fine powder and α-AL
2o
3the premixed powder of micro mist composition, mixed grind is about 10min, pug ageing mixture 3h aftershaping, and green compact, through 180 DEG C of baking 12h, under 1650 DEG C of air atmospheres after thermal treatment 3h, obtain corundum-mullite burnt brick.
Wherein, contained AL in corundum in granules and corundum fine powder
2o
3weight percent be greater than 99%, the granularity 2.0mm of particle, the granularity of micro mist is less than 0.088mm; Mullite particle adopts 72 electrofused mullites, AL contained by it
2o
3weight percent be greater than 72%, granularity 2.0mm; Compound α-AL
2o
3micro mist uses meso-position radius to be respectively the micro mist of 10 μm and 0.7 μm, and add-on is respectively 3% and 5%, the viscosity 1.50-2.00PaS of phosphate dihydrogen aluminum solution, proportion 1.70g/cm3.
The mark detected result that corundum-mullite burnt brick prepared by the present embodiment refers to is: apparent porosity 18.0%, volume density 2.85g/cm3, cold crushing strength 78.9MPa, strength at normal temperature 14.3MPa, 1400 DEG C of high temperature break resistant intensity 16.2MPa, AL
2o
3content 89.29%, dioxide-containing silica 9.17%, Fe
2o
3content 0.05%, Na
2o content 0.15%.
The detection method that above-described embodiment adopts comprises, test samples apparent porosity, the volume density of carrying out according to GB/T2997-2000 standard, according to its compressive strength of test that GB/T5072-2008 standard is carried out, the test high temperature break resistant intensity that GB/T3002-2004 standard is carried out, according to the chemical analysis that GB/T5069-2007 standard method is carried out.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (10)
1. a corundum-mullite burnt brick, is characterized in that, is at least obtained after high temperature sintering by following raw material, and the mass percent of described raw material is the corundum in granules of 30-40%, the mullite particle of 35-45%, surplus are corundum fine powder and active alpha-AL
2o
3micro mist, wherein, fine powder and micro mist have the less granularity of relative particle.
2. corundum-mullite burnt brick according to claim 1, is characterized in that, described corundum in granules is plate diamond spar particle or the plate diamond spar particle for being at least mixed with part white fused alumina particle.
3. corundum-mullite burnt brick according to claim 2, is characterized in that, the mass percent of described white fused alumina particle at least accounts for 10% of raw material total mass.
4. corundum-mullite burnt brick according to claim 1, is characterized in that, described raw material also comprises the α-AL with composite grain that mass percent is 5-8%
2o
3, wherein, α-AL
2o
3median be at least 0.5 μm.
5. corundum-mullite burnt brick according to claim 4, is characterized in that, described in there is the α-AL of composite grain
2o
3meso-position radius be at least one in 0.7 μm, 2 μm or 10 μm.
6., according to the arbitrary described corundum-mullite burnt brick of claim 1, it is characterized in that, the granularity of described corundum fine powder is not more than 0.088mm.
7., according to the arbitrary described corundum-mullite burnt brick of claim 1, it is characterized in that, the critical granularity of described corundum in granules and mullite particle is 2mm.
8., according to the arbitrary described corundum-mullite burnt brick of claim 1-7, it is characterized in that, described raw material also comprises appropriate inorganic jointing compound, described inorganic jointing compound be spent pulping liquor, Alumina gel, ρ-AL
2o
3or the one in aluminium dihydrogen phosphate.
9. fire the method for the arbitrary described corundum-mullite burnt brick of the claims 1-8 for one kind, it is characterized in that, by described raw material after batch mixing, ageing mixture 1-3h, mechanical pressing, toast 12-24h under 120-200 DEG C of condition after, the goods after baking are made finished product burnt brick through 1550-1650 DEG C of condition thermal treatment 3-5h under air atmosphere.
10. the method applied described in the claims 9 fires the corundum-mullite burnt brick obtained.
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| CN105399432A (en) * | 2015-11-23 | 2016-03-16 | 宜兴瑞泰耐火材料有限公司 | High-strength, high-purity and low-silicon corundum brick for petrochemical industry, and preparation method for corundum brick |
| CN109265148A (en) * | 2018-09-19 | 2019-01-25 | 洛阳科创新材料股份有限公司 | A kind of preparation method of air brick high-performance ceramic plate |
| CN109534833A (en) * | 2018-12-28 | 2019-03-29 | 瑞泰科技股份有限公司 | A kind of transition band of cement kiln and clinkering zone engaging portion mullite corundum silicon carbide brick |
| CN112028655A (en) * | 2020-09-16 | 2020-12-04 | 江苏隆达超合金航材有限公司 | Preparation method of mold bottom brick for high-temperature alloy ingot mold |
| CN112608137A (en) * | 2020-12-18 | 2021-04-06 | 上海电气燃气轮机有限公司 | Mullite fiber reinforced ceramic heat insulation tile |
| CN113651620A (en) * | 2021-08-13 | 2021-11-16 | 宜兴市海科窑炉工程有限公司 | Ceramic high-wear-resistance sealing refractory brick for ceramic heat exchanger and manufacturing method thereof |
| CN114368965A (en) * | 2022-01-21 | 2022-04-19 | 义马瑞辉新材料有限公司 | Preparation method of two-dimensional homogenized mullite corundum high-temperature material |
| CN114907134A (en) * | 2022-06-29 | 2022-08-16 | 平玉英 | Radiation energy-saving high-temperature refractory material for industrial kiln and preparation method thereof |
| CN116120042A (en) * | 2023-01-19 | 2023-05-16 | 河北国亮新材料股份有限公司 | Method for closely stacking refractory material matrixes and refractory material |
| CN116835969A (en) * | 2023-09-01 | 2023-10-03 | 北京利尔高温材料股份有限公司 | Corundum mullite and preparation method thereof |
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| CN105399432A (en) * | 2015-11-23 | 2016-03-16 | 宜兴瑞泰耐火材料有限公司 | High-strength, high-purity and low-silicon corundum brick for petrochemical industry, and preparation method for corundum brick |
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| CN109534833A (en) * | 2018-12-28 | 2019-03-29 | 瑞泰科技股份有限公司 | A kind of transition band of cement kiln and clinkering zone engaging portion mullite corundum silicon carbide brick |
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| CN112608137A (en) * | 2020-12-18 | 2021-04-06 | 上海电气燃气轮机有限公司 | Mullite fiber reinforced ceramic heat insulation tile |
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