CN105461326A - Refractory material used for heat accumulator in industrial kiln, and preparation technology thereof - Google Patents
Refractory material used for heat accumulator in industrial kiln, and preparation technology thereof Download PDFInfo
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- CN105461326A CN105461326A CN201410412937.XA CN201410412937A CN105461326A CN 105461326 A CN105461326 A CN 105461326A CN 201410412937 A CN201410412937 A CN 201410412937A CN 105461326 A CN105461326 A CN 105461326A
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Abstract
The invention discloses a refractory material used for a heat accumulator in an industrial kiln, and a preparation technology thereof. The refractory material comprises 15-45wt% of silicon carbide, 30-60wt% of oxide fine powder, 5-15wt% of white mud, 1-10wt% of silicon micro-powder, 1-15wt% of a silica sol solution and 1-15wt% of a binder. The preparation technology comprises the following steps: weighing all above raw materials according to above weight proportions, uniformly mixing silicon carbide, the oxide fine powder, white mud and the silicon micro-powder in a container, adding the binder and the silica sol solution, and stirring above materials until uniformity; putting the uniformly stirred materials in a high speed mixing mill, and further mixing the materials; carrying out compaction molding on the above obtained mixture in the high speed mixing mill, and drying the molded mixture; and sintering the above obtained molded and dried blank in a kiln. The refractory material provided by the invention has good high temperature, corrosion, oxidation and thermal shock resistance.
Description
Technical field
The present invention relates to technical field of refractory materials, particularly relate to a kind of refractory materials for heat storage in Industrial Stoves and preparation technology thereof.
Background technology
Effects of regenerative heat exchanging technology is 21 century energy saving standard one of technology with development potentiality most.It is the energy-conserving and environment-protective project that state key is promoted.Industrial Stoves are China big power consumers, and account for 26% of national energy consumption, energy-saving potential is huge, and in high-temperature heat treatment Industrial Stoves, effective utilization of secondary energy receives much concern and payes attention to.When flue-gas temperature is 900-1300 DEG C, fume afterheat accounts for the 50%-70% of stove total energy consumption, and therefore maximally utilising the energy in process of production fully can save human and material resources, thus obtains great economic benefit.
Heat storage is installed in Industrial Stoves firing system the waste heat recovery of flue gas is used for warm-up combustion-supporting air and reduces the discharge of air body pollutent, reduces carrying capacity of environment.High-temperature air burning be also called flameless combustion technology (FlamelessCombuation) be the nineties since developed country start a kind of new combustion technology applied. it high temperature air is sprayed into burner hearth to maintain hypoxia, the burning simultaneously will produced in fuel area density to air-flow. air themperature heat is to more than 800-1100 DEG C, combustion zone oxygen content in air 2%-21% compared with traditional combustion process the maximum feature of high-temperature air burning be the discharge that fuel saving reduces CO2 and NOx, reduce combustion noise and cost, be described as one of 21 century gordian technique.In heat accumulating type high temperature air combustion technology (HTAC) technology, heat storage made by general Ceramics material.Heat storage is the parts of most critical in High Temperature Air Combustion, is also the parts having technology content most and embody industrial manufacturing level.In prior art, as the material of heat storage, mainly contain clayey, corundum, mullite, zircon stone, aluminum-titanate-based, the material such as silicon carbide and cordierite, all there is very large defect.The more expensive thermal conductivity of its heat-shock resistance price difference lattice of corundum, mullite is low, and result of use portion is good.Clayey, cordierite have good thermal shock and the advantage such as cheap, but at high temperature (1250 DEG C) flue gas (especially containing the flue gas of the alkali metal vapours such as sodium and the flue gas containing sour gas such as SO2) the corrodibility extra-heavy to them, make clayey, the generation fusion bonding of cordierite heat storage and volatilization, thus obstruct airflow.Finally make heat storage impaired.
Therefore, a kind of refractory materials of high temperature resistant, corrosion-resistant, anti-oxidant, good thermal shock and preparation technology thereof is provided to be the technical problems that those skilled in the art need solution badly.
Summary of the invention
In order to solve the problems of the technologies described above, an object of the present invention is to provide a kind of refractory materials for heat storage in Industrial Stoves, it is high temperature resistant, corrosion-resistant, anti-oxidant, good thermal shock, and another object of the present invention is to provide the preparation technology of this refractory materials.
In order to realize above-mentioned first object, the invention provides a kind of refractory materials for heat storage in Industrial Stoves, this refractory materials comprises the composition of following weight ratio: silicon carbide 15%-45%; Oxide fine powder 30%-60%; White clay 5%-15%; Silicon powder 1%-10%; Silicon sol solution 1%-15%; Bonding agent 1%-15%.
Accordingly, a kind of method preparing refractory materials that the present invention also provides, comprise the following steps: take various material by the weight proportion of described refractory materials composition, in container, silicon carbide, oxide fine powder, white clay, silicon powder are mixed, then add bonding agent and silicon sol solution stirs; Material after stirring is put into high speed mixing pan mix further; By material compression moulding mixed in high speed mixing pan, drying; Then shaping, dried blank is put into kiln sintering.
Preferably, described blank sintering carries out according to following sintering temperature: normal temperature → 1350 DEG C, and the sintering wherein at 800 DEG C keeps 6-7 hour; Normal temperature is 7-10 hour to 800 DEG C of heating-up times; 800 DEG C to 1350 DEG C heating-up times are 4-6 hour.
Preferably, the material after stirring being put into the time that high speed mixing pan carries out mixing is further 25-32 minute.
Preferably, material compression moulding uses friction press to be pressed, and material drying is microwave drying.
Compared with prior art, the present invention, by the adjustment to composition, especially adds bonding agent and silicon sol solution, and the control to phase transformation in sintering process, has both improve high thermal resistance, thermal shock resistance, thermal conductivity, erosion resistance, and has again reduced density.Owing to reducing density, greatly reduce the volume of regenerative heat exchanger, simultaneously, improve high thermal resistance, thermal shock resistance, thermal conductivity, erosion resistance, make this refractory materials can at high temperature life-time service, the cold degree of preheating of secondary air can be improved, reduce material unit consumption, there is energy-saving effect.
Embodiment
In embodiment, content is all weight percentage.
Embodiment 1
Take the raw material of following weight; Silicon carbide 20; Oxide fine powder 45%; White clay 7%; Silicon powder 8%; Silicon sol solution 12%; Bonding agent 8%; Silicon carbide, oxide fine powder, white clay, silicon powder are added in container and mix, after mixing, by bonding agent and silicon sol
Solution adds in container and stirs; Add after stirring in high speed mixing pan and mix after 40 minutes, by friction press compression moulding and microwave drying; Shaping, dry rear gained blank is put into kiln, heats up from normal temperature, within 7 hours, be warming up to 800 DEG C, at 800 DEG C, be incubated 9 hours, then, within 5 hours, be warming up to 1350 DEG C and continue sintering, obtain refractory materials.
Measure refractory materials prepared by the present embodiment, after tested, the refractoriness of this refractory materials is 1750 DEG C, and volume density is 0.8g/cm3, and thermal conductivity is 1.3W/(mk)-1, thermal shock resistance is 1100 DEG C of water-cooleds 92 times.
Embodiment 2
Silicon carbide 35%; Oxide fine powder 40%; White clay 6%; Silicon powder 4%; Silicon sol solution 8%; Bonding agent 7%; Silicon carbide, oxide fine powder, white clay, silicon powder are added in container and mix, after mixing, bonding agent and silicon sol solution is added in container and stirs; Add after stirring in high speed mixing pan and mix after 27 minutes, by 400 tons of friction press compression mouldings and microwave drying; Shaping, dry rear gained blank is put into kiln, heats up from normal temperature, within 9 hours, be warming up to 800 DEG C, at 800 DEG C, be incubated 5 hours, then, within 3 hours, be warming up to 1350 DEG C and continue sintering, obtain refractory materials.
Measure refractory materials prepared by the present embodiment, after tested, the refractoriness of this refractory materials is 1800 DEG C, and volume density is 0.78g/cm3, and thermal conductivity is 1.2W/(mk)-1, thermal shock resistance is 1100 DEG C of water-cooleds 85 times.
Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, some improvement, retouching or change can also be made, also above-mentioned technical characteristic can be combined by rights; These improve retouching, change or combination, or the design of invention and technical scheme are directly applied to other occasion without improving, and all should be considered as protection scope of the present invention.
Claims (4)
1. for refractory materials and the preparation technology thereof of heat storage in Industrial Stoves, it is characterized in that, this refractory materials comprises the composition of following weight ratio: silicon carbide 15%-45%; Oxide fine powder 30%-60%; White clay 5%-15%; Silicon powder 1%-10%; Silicon sol solution 1%-15%; Bonding agent 1%-15%.
2. an a kind of refractory materials for heat storage in Industrial Stoves according to claim 1 and preparation technology thereof, it is characterized in that, this preparation technology comprises the following steps: take various material by the weight proportion of described refractory materials composition, in container, silicon carbide, oxide fine powder, white clay, silicon powder are mixed, then add bonding agent and silicon sol solution stirs; Material after stirring is put into high speed mixing pan mix further; By material compression moulding mixed in high speed mixing pan, drying; Then shaping, dried blank is put into kiln sintering.
3. preparation technology according to claim 2, is characterized in that, blank sintering carries out according to following sintering temperature: normal temperature → 1350 DEG C, and the sintering wherein at 800 DEG C keeps 6-7 hour; Normal temperature is 7-10 hour to 800 DEG C of heating-up times; 800 DEG C to 1350 DEG C heating-up times are 4-6 hour.
4. preparation technology according to claim 3, is characterized in that, the material after stirring being put into the time that high speed mixing pan carries out mixing is further 30-35 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410412937.XA CN105461326A (en) | 2014-08-21 | 2014-08-21 | Refractory material used for heat accumulator in industrial kiln, and preparation technology thereof |
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| CN201410412937.XA CN105461326A (en) | 2014-08-21 | 2014-08-21 | Refractory material used for heat accumulator in industrial kiln, and preparation technology thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107188577A (en) * | 2017-06-12 | 2017-09-22 | 合肥铭佑高温技术有限公司 | A kind of exotic material and preparation method for Industrial Stoves body of heater |
| CN107244927A (en) * | 2017-05-11 | 2017-10-13 | 长兴县煤山工业炉料有限公司 | A kind of graphite refractory |
-
2014
- 2014-08-21 CN CN201410412937.XA patent/CN105461326A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107244927A (en) * | 2017-05-11 | 2017-10-13 | 长兴县煤山工业炉料有限公司 | A kind of graphite refractory |
| CN107188577A (en) * | 2017-06-12 | 2017-09-22 | 合肥铭佑高温技术有限公司 | A kind of exotic material and preparation method for Industrial Stoves body of heater |
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Application publication date: 20160406 |
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| WD01 | Invention patent application deemed withdrawn after publication |