CN1357739A - Heat-insualting method and prepn. of combined heat insulating layer with great temperature gradient - Google Patents
Heat-insualting method and prepn. of combined heat insulating layer with great temperature gradient Download PDFInfo
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- CN1357739A CN1357739A CN 01138615 CN01138615A CN1357739A CN 1357739 A CN1357739 A CN 1357739A CN 01138615 CN01138615 CN 01138615 CN 01138615 A CN01138615 A CN 01138615A CN 1357739 A CN1357739 A CN 1357739A
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Abstract
The present invention using a combined heat insulating layer made of cooling water jacket from outside to inside, vacuum heat insulating layer and heat reflecting and insulating mirror layer produced into one integral structure as well as light refractory break heat insulating layer. It can prevent heat from transferring from the heating body to outer environment, reduce energy loss and reduce the thickness of heat insulating layer effectively, and can realize gradient temperature reduction from 1600 deg.c to 40 deg.c in a 40 mm thickness, and is suitable for high temperature heating furnace and smelting furnace needing compact structure.
Description
Technical field: the invention belongs to the heat preserving method of heating furnace, particularly a kind of heat-insulating method of big thermograde.
Background technology: have a lot of needs to be heated to 1500-1600 ℃ of high-temperature service that works long hours or device in laboratory or the industrial production, molybdenum filament heating furnace as the laboratory use, silicon-carbon pipe furnace etc., the electric arc furnaces that metallurgical industry is used, converter such as electric induction furnace or converter, when designing and making these high-temperature services or device, not only to select suitable heating element heater and heating means, guarantee to be heated to 1500-1600 ℃, but also to design suitable insulating, heating-up temperature height because of these high-temperature services, big with the temperature difference of environment, the thicker insulating of general at present employing, to reduce radiation and the conduction of heat to external environment, reduce energy resource consumption, improve the thermal efficiency.And the high-temperature service that some specific condition uses down, be subjected to the restriction of its structure and working space, can not adopt the bigger insulating of thickness, require to reduce as far as possible the thickness of insulating, as require the thickness of heat-insulation layer to be reduced to 30-50mm, for making temperature, the 30-50mm insulating is reduced to 40 ℃, the high efficiency heat-insulating method of this requirement employing, the temperature drop of the big thermograde of realization in very thin insulation layer by thickness from 1600 ℃.
Chinese patent discloses the heat-resisting insulation top board that adopts heat-resisting insulation compound roof to substitute the kiln of block arch method making for No. 2191401, and in the crown, this heat-resisting insulation compound roof is made of steel framework, metallic plate, refractory insulating layer.Metallic plate is welded on the framework, and refractory insulating layer is fastening to be bonded on the metallic plate.This heat-resisting insulation compound roof has advantages such as easy-maintaining, long service life, high insulating effect.Chinese patent announces that a kind of kiln burns till attemperator for No. 2435712, its kiln top is the U-shaped structure that the framework with the kiln body that heat-resistant steel wire is made is connected, the position, intermediate portion is installed with earthenware, be fixed with ceramic wool on heat-resisting silk, the earthenware, be stained with one deck web-like fibrofelt on the interior wall of ceramic wool and kiln body, have high insulating effect, low, the quality of production advantages of higher of energy consumption.These two kinds of high efficiency heat preserving methods are applicable to the heat-insulation and heat-preservation of Industrial Stoves, but and not to be suitable for heating-up temperature be 1500-1600 ℃ high melt device or equipment, and the thickness of its insulating is bigger.
The medium people of Li Chun (Northeastern University's journal, 1994, Vol.15 No5, P495-497) Yan Zhi a kind of continuous casting billet is incubated quick conveying device, and the stay-warm case of this device adopts totally enclosed structure, and the insulation material of refractory ceramic fibre is adopted on the top of cover body, the lower semisection of cover body adopts filler and refractory concrete structure, this device has the characteristics of high insulating effect, but its thickness is greater than 50mm, and refractory fibre is difficult to use under 1500-1600 ℃ high temperature.
The objective of the invention is to propose a kind of big semi-solid rheopectic slurry and preparation thereof, promptly adopt be that cooling jacket is heat insulation from outside to inside successively, the thermal insulation layer of vacuum heat-insulation, minute surface reflective insulation layer and four kinds of combinations of light fire brick thermal insulation layer, and cooling jacket thermal insulation layer, vacuum heat-insulating layer, minute surface reflective insulation layer made an overall structure, to reduce insulation layer thickness, increase heat insulation effect, thereby realize the cooling of big thermograde.
Summary of the invention: technical scheme of the present invention is that cooling jacket is heat insulation, vacuum heat-insulation, minute surface reflective insulation and light fire brick make up.Combined heat insulated heat-insulation layer is cooling jacket thermal insulation layer (1), vacuum heat-insulating layer (2), minute surface reflective insulation (3) and light fire brick thermal insulation layer (4) from outside to inside successively.Cooling water in the cooling jacket thermal insulation layer (1) enters cooling chamber by the water inlet (6) of below, by delivery port (7) outflow of top, regulates the flow of cooling water, and the water temperature of control delivery port (7) is no more than 40 ℃.The aspirating hole (9) of vacuum heat-insulating layer (2) vacuumizes vacuum chamber, when reaching required vacuum 0.1-0.2 atmospheric pressure, aspirating hole (9) is sealed, and vacuum chamber thickness is 3-5mm.
The preparation of combined heat insulated layer is that cooling jacket thermal insulation layer (1), vacuum heat-insulating layer (2), minute surface reflective insulation layer (3) are made an overall structure, is welded by corrosion resistant plate.Cooling jacket thermal insulation layer (1) is provided with the thick cooling water chamber of 5-8mm, water inlet (6) is located at the below, delivery port (7) is located at the top, two sides of cooling jacket thermal insulation layer (1) are made by corrosion resistant plate, wherein the vacuum chamber of a side and vacuum heat-insulating layer (2) is shared, and the another side of the vacuum chamber of vacuum heat-insulating layer (2) is the specular layer (3) that the polishing stainless steel plate is made.The gap that 5-10mm is arranged between minute surface reflective insulation layer (3) and the light fire brick layer (4).Light fire brick interlayer (4) adopts Al
2O
3Foamed brick is made, and thickness is 15-20mm, and refractoriness is greater than 1600 ℃.
The invention has the advantages that: the thickness of (1) heat-insulation layer is little, saves the space, at the thickness temperature drop for having realized in the insulation layer of 35-40mm reducing to big thermograde below 40 ℃ by 1600 ℃ only; (2) thermal efficiency height.Owing to used multinomial heat-insulation and heat-preservation measures such as the minute surface reflection of heat-insulating property light fire brick, polishing stainless steel and vacuum heat-insulation, stoped heat from the transmission of heater effectively to external environment, improved the thermal efficiency of heating furnace, reduced the consumption of energy.(3) adopt the high Al of refractoriness
2O
3Foamed brick is as high temperature insulating material, and maximum operation (service) temperature can reach 1600 ℃, is applicable in the high-temperature heater of compact conformation or the melting furnace to use.(4) safe and reliable, outermost layer is provided with cooling jacket, has guaranteed that heat-insulation layer outside cold junction temperature is less than 40 ℃.
Description of drawings:
Fig. 1 is the schematic diagram of combined heat insulated layer, and wherein (1) is that cooling jacket thermal insulation layer, (2) are cooling jacket delivery port for heater, (6) for cooling jacket water inlet, (7) for minute surface reflective insulation layer, (4) light fire brick thermal insulation layer, (5) for vacuum heat-insulating layer, (3).
Fig. 2 is cooling jacket, vacuum chamber and minute surface reflection polishing stainless steel plate welding schematic diagram, and wherein (8) are solder side, and (9) are aspirating hole.
The specific embodiment:
1, cooling jacket is first kind of provision for thermal insulation that this combined heat insulated layer is taked, and by the cooling water of cooling jacket, the prevention heat to the low-temperature end transmission, is realized heat-blocking action from temperature end.Cooling jacket places the outermost layer of combined heat insulated layer, wherein be provided with the thick cooling water chamber of 5-8mm, be connected with cooling water system with delivery port (7) by water inlet (6), as shown in Figure 1, cooling water enters cooling water chamber by water inlet (6), flow out from this chamber by delivery port (7), water inlet (6) is located at the below, delivery port (7) is located at the top, to guarantee having cooling water to feed in this cooling water chamber all the time, by regulating the flow of cooling water, 40 ℃ of the water temperatures of control delivery port (7) make the cooling jacket temperature outside less than 40 ℃.
2, vacuum heat-insulation is second kind of provision for thermal insulation that this combined heat insulated layer is taked, and aspirating hole (9) vacuumizes vacuum chamber, when reaching required vacuum, aspirating hole (9) is sealed, and the thickness of vacuum chamber is 5-8mm, and vacuum is the 0.1-0.2 atmospheric pressure.Vacuum chamber is near cooling water chamber, and with the shared side of cooling water chamber, the another side is made of the thick polishing stainless steel plate of 1mm.
3, specular layer is the third provision for thermal insulation that this combined heat insulated layer is taked, make by the polishing stainless steel plate, minute surface reflex by the polishing stainless steel plate, to reflect back effectively from the heat of hot junction radiation, play minute surface reflective insulation effect, strengthen heat insulation and preservation effect, improved the thermal efficiency of high-temperature service.The polishing stainless steel plate of minute surface reflective insulation and cooling jacket, vacuum chamber constitute an overall structure, make the polishing stainless steel plate can obtain the cooling effect of cooling water, keep lower operating temperature, can prevent the surface oxidation of polishing stainless steel and lose the minute surface reflex.
4, light fire brick is heat insulation is the 4th kind of provision for thermal insulation that this combined heat insulated layer is taked, and adopts Al
2O
3Foamed brick is made, by lightweight Al
2O
3The thermal conductivity that refractory brick is very low realizes the soak effect.The thickness of light fire brick thermal insulation layer (4) is 15-20mm.Because this insulating is near heater (5), the material that requires to make this layer not only has good effect of heat insulation, but also should have very high refractoriness, and heater (5) heating-up temperature is 1600 ℃, adopts refractoriness greater than 1600 ℃ Al
2O
3Foamed brick can satisfy the requirement of soak.Minute surface reflective insulation effect on the one hand can be improved in the gap that 5-10mm is arranged between minute surface reflective insulation layer and the light fire brick layer, the friction in the time of can preventing to assemble on the other hand between light fire brick layer and the corrosion resistant plate minute surface and damage minute surface.
Combined heat insulated layer of the present invention practices on the semi-solid rheological iron and steel slurry device, the inside of this device is the molybdenum filament heating furnace, its external diameter is φ 100mm, heating-up temperature is 1600 ℃, ferrous materials can be melted, the outside is the coil windings that produces rotating excitation field, and its operating temperature is controlled at below 40 ℃, turns round safely and effectively to guarantee it.Combined heat insulated being placed between this coil windings of installing inner molybdenum filament heating furnace and outside generation rotating excitation field adopted Al in the enforcement
2O
3Foamed brick thickness is 15mm, the thickness of cooling water chamber is 8mm, the thickness of vacuum chamber is 5mm, the gap is 10mm between minute surface reflective insulation layer and the light fire brick layer, combined heat insulated layer gross thickness is 36mm, the temperature of the inner molybdenum filament heating furnace of this device reaches 1600 ℃ in the practical application, and cooling water flow is 0.2m
3Under the condition of/h, the water temperature of delivery port is lower than 40 ℃, guarantees outside coil windings temperature below 40 ℃, has realized the temperature drop of big thermograde in thickness is the combined heat insulated layer of 36mm, average temperature gradient is 43.3 ℃/mm, illustrates that this combined heat insulated layer is obtained good result of use.
Claims (5)
1, a kind of big semi-solid rheopectic slurry, comprise that cooling jacket is heat insulation, vacuum heat-insulation, minute surface reflective insulation and light fire brick be heat insulation, it is characterized in that cooling jacket is heat insulation, vacuum heat-insulation, minute surface reflective insulation and light fire brick make up, combined heat insulated heat-insulation layer is cooling jacket thermal insulation layer (1), vacuum heat-insulating layer (2), minute surface reflective insulation layer (3) and light fire brick thermal insulation layer (4) from outside to inside successively.
2, big semi-solid rheopectic slurry according to claim 1, it is characterized in that the water inlet (6) of cooling water by the below in the cooling jacket thermal insulation layer (1) enters cooling chamber, delivery port (7) by the top flows out, regulate the flow of cooling water, the water temperature of control delivery port (7) is no more than 40 ℃.
3, big semi-solid rheopectic slurry according to claim 1, the aspirating hole (9) that it is characterized in that vacuum heat-insulating layer (2) vacuumizes vacuum chamber, when reaching required vacuum 0.1-0.2 atmospheric pressure, aspirating hole (9) is sealed, vacuum chamber thickness is 3-5mm.
4, the preparation of the combined heat insulated layer of a kind of big thermograde, it is characterized in that cooling jacket thermal insulation layer (1), vacuum heat-insulating layer (2), minute surface reflective insulation layer (3) are made into an overall structure, be welded by corrosion resistant plate, two sides of cooling jacket thermal insulation layer (1) are made by corrosion resistant plate, wherein the vacuum chamber of a side and vacuum heat-insulating layer (2) is shared, the another side of the vacuum chamber of vacuum heat-insulating layer (2) is the specular layer (3) that the polishing stainless steel plate is made, and the gap of 5-10mm is arranged between minute surface reflective insulation layer (3) and the light fire brick layer (4).
5, the preparation of the combined heat insulated layer of big thermograde according to claim 4 is characterized in that light fire brick interlayer (4) adopts Al
2O
3Foamed brick is made, and thickness is 15-20mm, and refractoriness is greater than 1600 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01138615 CN1357739A (en) | 2001-12-28 | 2001-12-28 | Heat-insualting method and prepn. of combined heat insulating layer with great temperature gradient |
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| CN 01138615 CN1357739A (en) | 2001-12-28 | 2001-12-28 | Heat-insualting method and prepn. of combined heat insulating layer with great temperature gradient |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021660A (en) * | 2010-12-30 | 2011-04-20 | 绍兴精功机电有限公司 | Polysilicon crucible sintering furnace |
| CN102410735A (en) * | 2011-12-20 | 2012-04-11 | 江苏省苏中建设集团股份有限公司沈阳分公司 | Reflective combined type heat-insulating furnace wall of industrial kiln |
| CN102661972A (en) * | 2012-05-16 | 2012-09-12 | 北京黎明航发动力科技有限公司沈阳黎明燃机分公司 | Gas turbine heat shield and heat insulating property measurement method thereof |
| CN102815028A (en) * | 2012-08-16 | 2012-12-12 | 东华大学 | Fire-proofing and heat-insulating composite fabric with second order phase transition temperature limit, and preparation method and application thereof |
| CN102889787A (en) * | 2011-07-22 | 2013-01-23 | 深圳市沃尔核材股份有限公司 | Environmentally-friendly energy-saving heating furnace |
| CN108531992A (en) * | 2018-07-04 | 2018-09-14 | 深圳市鑫万福珠宝首饰有限公司 | A kind of sapphire processing furnace body attemperator |
| CN110220382A (en) * | 2019-06-10 | 2019-09-10 | 苏州鼎安科技有限公司 | A kind of Energy saving chamber of furnace and preparation method thereof with air heat insulation and heat radiation reflecting layer |
| CN111114746A (en) * | 2019-12-23 | 2020-05-08 | 北京空天技术研究所 | Skin structure |
-
2001
- 2001-12-28 CN CN 01138615 patent/CN1357739A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021660A (en) * | 2010-12-30 | 2011-04-20 | 绍兴精功机电有限公司 | Polysilicon crucible sintering furnace |
| CN102021660B (en) * | 2010-12-30 | 2012-11-21 | 绍兴精功机电有限公司 | Polysilicon crucible sintering furnace |
| CN102889787A (en) * | 2011-07-22 | 2013-01-23 | 深圳市沃尔核材股份有限公司 | Environmentally-friendly energy-saving heating furnace |
| CN102889787B (en) * | 2011-07-22 | 2016-01-27 | 深圳市沃尔核材股份有限公司 | Environment-friendly and energy-efficient heating furnace |
| CN102410735A (en) * | 2011-12-20 | 2012-04-11 | 江苏省苏中建设集团股份有限公司沈阳分公司 | Reflective combined type heat-insulating furnace wall of industrial kiln |
| CN102661972A (en) * | 2012-05-16 | 2012-09-12 | 北京黎明航发动力科技有限公司沈阳黎明燃机分公司 | Gas turbine heat shield and heat insulating property measurement method thereof |
| CN102661972B (en) * | 2012-05-16 | 2015-02-11 | 北京黎明航发动力科技有限公司沈阳黎明燃机分公司 | measurement method of heat insulating property of gas turbine heat shield |
| CN102815028A (en) * | 2012-08-16 | 2012-12-12 | 东华大学 | Fire-proofing and heat-insulating composite fabric with second order phase transition temperature limit, and preparation method and application thereof |
| CN102815028B (en) * | 2012-08-16 | 2015-07-08 | 东华大学 | Fire-proofing and heat-insulating composite fabric with second order phase transition temperature limit, and preparation method and application thereof |
| CN108531992A (en) * | 2018-07-04 | 2018-09-14 | 深圳市鑫万福珠宝首饰有限公司 | A kind of sapphire processing furnace body attemperator |
| CN110220382A (en) * | 2019-06-10 | 2019-09-10 | 苏州鼎安科技有限公司 | A kind of Energy saving chamber of furnace and preparation method thereof with air heat insulation and heat radiation reflecting layer |
| CN111114746A (en) * | 2019-12-23 | 2020-05-08 | 北京空天技术研究所 | Skin structure |
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