CN204880115U - A high -efficient heat transfer radiant tube for radiant tube heating furnace or heat treatment furnace - Google Patents
A high -efficient heat transfer radiant tube for radiant tube heating furnace or heat treatment furnace Download PDFInfo
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- CN204880115U CN204880115U CN201520502544.8U CN201520502544U CN204880115U CN 204880115 U CN204880115 U CN 204880115U CN 201520502544 U CN201520502544 U CN 201520502544U CN 204880115 U CN204880115 U CN 204880115U
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- radiant tube
- heat transfer
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Abstract
The utility model discloses a high -efficient heat transfer radiant tube for radiant tube heating furnace or heat treatment furnace, the radiant tube is U type or W type radiant tube, the radiant tube comprises straight tube section and bend loss, radiant tube internal and external surface all is provided with infrared glaze layer, be provided with the plug -in part in the straight tube section, the plug -in part surface is provided with infrared glaze layer. The utility model discloses an internal and external surface of U type or W type radiant tube is provided with infrared glaze layer, reinforces radiant tube internal and external surface's radiation heat transfer, carries high radiation pipe heat transfer efficiency, simultaneously, through the isolation on glaze layer, has avoided in the radiant tube combustion gas and the outer burner gas of radiant tube to the corruption of radiant tube heat -resisting alloy base member, reach carry the impervious carbon of high radiation pipe heat -resisting alloy base member, anticorrosive with resist damaged ability and increase of service life purpose.
Description
Technical field
The utility model relates to a kind of hyperthermia radiation pipe, is specifically related to a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace.
Background technology
Radiant tube indirect has isolated heated parts and contacts combustion gases in stove, avoids the high temperature corrosion of burning gases to heated parts, is thus needing the industrial furnace heated under atmosphere protection condition is used widely, as band steel continuous heat treating furnace.
Radiating tube furnace is the earliest that Germany invents in the thirties in 20th century and uses, its structure is individual layer straight pipe type, level or pass perpendicularly through burner hearth arrange, until the beginning of the fifties, U-shaped radiant tube just came out, and developed P type and the O type of W type and exhaust gas recirculatioon on this basis.Due to U-shaped with the effective heating surface (area) (HS of W type radiant tube is large, fuel availability is high, control and operate the advantages such as comparatively easy, therefore on large-scale band steel continuous heat treating furnace, application is maximum.
U-shaped for what commonly use, W type radiant tube, prepared by main employing bend pipe and straight tube assembly welding, combustion gas and combustion air mix while burn in U-shaped or W type radiant tube, radiant tube is transferred heat to by convection current and radiant heat transfer mode, again by convection current and the radiation of radiant tube outer wall, realize the heating object to workpiece, enter radiant tube mixed combustion in radiant tube combustion gas and combustion air to export the one way of discharging to burning gases from radiant tube and flow diabatic process, due to the interaction that fuel combustion and radiant tube conduct heat, cause radiant tube surface temperature along burning gases flow direction acute variation, and at burning gases high temperature and along under the effect of journey thermal (temperature difference) stress, cause radiant tube deformation with damaged, meanwhile, high-temperature combustion gas contacts with washing away of tube wall, causes the high temperature corrosions such as tube wall carburizing, nitriding, oxidation, causes the deterioration of tube wall metal material structure to come off with corrosion, exacerbates the breakage of radiant tube further.Radiant tube breakage will make combustion inner pipe gas permeation enter burner hearth, destroy protective gas in stove, cause workpiece surface quality defect, even cause radiant tube pipe shaft to rupture, cause heat-treatment furnace blowing out, cause economic loss.Especially China, the production capacity famine of high energy efficiency radiant tube, radiant tube mainly adopts centrifugal casting to manufacture straight tube and hot investment casting to manufacture bend pipe, the straight tube wall thickness of centrifugal casting manufacture is minimum will reach more than 8mm, the bend pipe wall thickness of hot investment casting manufacture is minimum will reach more than 10mm, cause that radiant tube Heavy Weight, cost are high, heat utilization rate is low, percentage elongation is low, under the condition of high temperature, more easily produce flexural deformation and cracking failure.
For the problems referred to above, Chinese scholars has carried out a large amount of research work, the Chinese utility model patent being 00255958.7 as: application number discloses a kind of reinforced U-shaped radiation pipe, this utility model is by arranging girth member at U-shaped radiant tube straight tube and elbow pipe welding place, improve hyperthermia radiation pipe solder bond intensity, prevent seam deformation, fracture and gas leakage, reach the object in service life of radiant tubes service life.Application number be 200820023423.5 Chinese utility model patent disclose W type radiation pipe apparatus in a kind of gas type heating stove of suspension type load-bearing, it by arranging suspension connection device between W type radiant tube exhanst gas outlet side pipe and intervalve, overcome former support improper cause radiant tube high temperature deformation, problem of Cracking.Application number be 98109545.3 Chinese invention patent disclose a kind of bracing or strutting arrangement of radiant tube, its for arrange in W type radiant tube supporting bracket and support component stove perishable, be out of shape the support caused slide difficulty problem, invent a kind of stove outer support device, ensure that movable support freely, overcome radiant tube high temperature deformation that resistance to sliding causes with damaged.In addition, application number be 201110227142.8 Chinese invention patent disclose a kind of high temp, infrared radiation glaze and preparation method thereof, its commercially available infrared radiation glaze for serviceability temperature≤850 DEG C can not meet the problem that band steel high-temperature heat treatment temperature (900 ~ 1200 DEG C) requires, invented a kind of high temp, infrared radiation glaze, its composition with percentage by weight is: glass flake 5 ~ 43, frit 10 ~ 17, base enamel 6 ~ 23, chrome green fine powder 20 ~ 28, cordierite fine powder 7 ~ 12, high-emissivity material fine powder 7 ~ 15, simultaneously, also invented the preparation of this infrared radiation glaze and radiant tube appearance cover coat living broadcast method, after preparation by glaze and the online brushing at radiant tube outer surface thereof are dried in the shade, utilize stove to heat up and be heated to glazing temperature (950 ~ 1150 DEG C), about high than normal production furnace temperature 100 DEG C, normal furnace temperature is recovered after glazing 8-12 minute, can sinter securely on radiant tube outer surface, its serviceability temperature can reach 1050 DEG C, normal direction total emissivity ε n >=0.87 of 2.5-20 μm of full infrared band, have acidproof, caustic corrosion, chemistry and Heat stability is good, mechanical strength is high, nontoxic pollution, the feature that anti-oxidant anti-carbon potential is strong.Document " Zhu little Ping, Ying Hong, Jiang Yanghu etc.; the application of high-temperature anti-carburization anticorrosion infrared radiation glaze materials; Wuhan Iron and Steel Plant technology; 2004; No6 " reports the applicable cases of infrared radiation glaze on the U-shaped radiant tube outer surface of Wuhan Iron and Steel Plant silicon steel many continuous annealing furnaces, achieves service life of radiant tubes service life, improves the good effect of radiant tube surface temperature uniformity.Because the control technology content of the preparation of hyperthermia radiation glaze and correlated performance thereof is high, applies and need professional and technical personnel to instruct.
As can be seen here, for the problem of band steel continuous heat treating furnace radiant tube because of high temperature deformation and thermal (temperature difference) stress breakage, Chinese scholars has carried out a large amount of research work, but is mostly the limited efficiency that improves of prior art due to above-mentioned technology; Infrared radiation glaze technology is only in the glazing of radiant tube outer surface, and heat conduction reinforced effect still has remarkable room for improvement; In addition, for radiant tube inwall burning gases High Temperature Corrosion, yet there are no correlative protection technology report.Although associated user's radiant tube version is identical, but because operating the difference of control technology and radiating tube furnace functional requirement, the subject matter of radiant tube performance is also different, thus the general key issue only existed according to self carries out corresponding independent research and application, and correlation technique is difficult to obtain system and applies.But be not difficult to find out, as the radiant tube of indirect thermal source, how improving the radiant tube thermal efficiency, improving temperature homogeneity is then a common problem, thus, is necessary to continue research.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace, there is heat conduction reinforced inside and outside radiant tube, the advantage such as object heating surface normal beam technique is high to radiant heat flux density, the thermal efficiency is high, long service life.
For achieving the above object, a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace designed by the utility model, described radiant tube is U-shaped or W type radiant tube, described radiant tube is made up of straight length and bend loss, described radiant tube surfaces externally and internally is provided with infra-red radiation glaze layer, be provided with plug-in part in described straight length, described plug-in part surface is provided with infra-red radiation glaze layer.
Further, described plug-in part is spiral board structure.Described plug-in part adopts heat-resisting alloy or silicon carbide ceramics preparation;
Again further, the thickness of described infra-red radiation glaze layer is 0.1 ~ 0.2mm.Described infra-red radiation glaze layer adopts the spraying of infrared radiation glaze slurry or dip-coating, dries in the shade, enamel firing glazing preparation.
Infrared radiation glaze carries out formulation selection according to radiant tube from the different of plug-in part glazing face maximum surface temperature, specifically, when maximum surface temperature≤850 DEG C, the method provided according to document " Chen Zhifang, the formula Design of far infrared enamel and characteristic, glass and enamel; Vol19; No5 " is carried out formula Design or chooses, otherwise adopts the high temp, infrared radiation glaze that Chinese patent " a kind of high temp, infrared radiation glaze and preparation method thereof, the patent No.: ZL201110227142.8 " provides.
Again further, the straight length of described radiant tube and bend loss tube wall are even surface or corrugated surface, can interworking combination.
Again further, the straight length of described radiant tube and bend loss cross section are circular or elliptic cross-section.
Again further, the bend loss of described radiant tube, the straight length tube wall of elliptic cross-section and tube wall be corrugated surface straight length adopt heat-resisting alloy precision casting preparation, and the radiant tube straight length that circular cross-section and tube wall are even surface adopts heat-resisting alloy spun casting preparation.
The beneficial effects of the utility model:
1) the utility model is provided with infra-red radiation glaze layer by surfaces externally and internally that is U-shaped or W type radiant tube, the radiant heat transfer of strengthening radiant tube surfaces externally and internally, improve radiant tube heat transfer efficiency, simultaneously, by the buffer action of glaze layer, avoid the outer furnace gas of radiant tube combustion gas and radiant tube to the corrosion of radiant tube heat-resisting alloy matrix, reach and improve the impervious carbon of radiant tube heat-resisting alloy matrix, anticorrosive with resisting breakage ability and the object that increases the service life;
2) the utility model utilizes glaze layer thermal conductivity factor to be less than the feature of radiant tube metallic matrix, by the buffer action of the layer thermal boundary effect of radiant tube inwall glaze and high-temperature combustion gas, alleviate radiant tube burning load and change the tube wall alternating thermal stress caused, isolate the corrosion of high-temperature combustion gas to tube wall, improve radiant tube serviceability and resisting breakage, resistance to corrosion;
3) the utility model is by improving infra-red radiation glaze layer infrared radiation property and optimizing glazed thickness size (0.1 ~ 0.2mm), coordinate radiant heat transfer enhancing and the effect of radiant tube tube wall conduction thermal boundary of glaze layer, ensure that the resistance to elevated temperatures of infra-red radiation glaze layer, improve the reliability of glaze layer steady operation, reach and reduce the metal pipe-wall heat transfer temperature difference and metallic matrix temperature, improve radiant tube surface temperature uniformity and improve the resultant effect of radiant tube serviceability and heat transfer efficiency;
4) the utility model is circular or elliptic cross-section and radiant tube tube wall by radiant tube is the structural pipe wall design of even surface and corrugated surface and corresponding preparation method, reduce cost of manufacture, improve radiant tube heat transfer ratio surface area, strengthening radiant tube radiation and convection heat transfer' heat-transfer by convection, alleviate radiant tube stress damaged, improve object heating surface normal beam technique and increase the service life to radiant heat flux density.By the setting of radiant tube straight length inward eddy plate plug-in part, radiant tube combustion gas cyclone is moved, convection heat transfer' heat-transfer by convection in enhanced tube, simultaneously by the effect of the radiant heat transfer transformant of this plug-in part, radiant heat transfer in strengthening radiant tube, reaches the object improving the radiant tube thermal efficiency.By the integrated application of above-mentioned technology, finally reach service life of radiant tubes service life, improve radiant tube heating intensity and the thermal efficiency, reduce the objects such as radiant tube stove energy consumption.
In sum, the heat conduction reinforced technology of radiant tube is single both at home and abroad at present, adaptation condition condition is limited, simultaneously with high content of technology, need professional person's on-the-spot guidance, generally only have and utilize maintenance to implement opportunity, cause that Technique Popularizing is limited, maintenance duration extends, construction quality is difficult to ensure, the not only practical application effect of influence power monotechnics, also have impact on the steady production of producing line; Meanwhile, radiant tube inwall burning gases high temperature corrosion guard technology lacks, and constrains the prolongation in radiant tube service life.The utility model implements every heat transfer enhancement technology and radiant tube inwall guard technology by radiant tube processing preparation process, every technology is made directly to be cured to radiant tube product, directly installed by the scene of efficient heat transfer radiant tube product, realize radiating tube furnace high quality and low cost steady production, the energy-efficient object with long service life, thus overcoming the deficiencies in the prior art, popularizing application prospect is wide.
Accompanying drawing explanation
The U-shaped efficient heat transfer radiant tube structural representation of Fig. 1 to be a kind of straight length of the utility model tube wall be even surface.
The W type efficient heat transfer radiant tube structural representation of Fig. 2 to be a kind of straight length tube wall of the utility model be even surface.
The U-shaped efficient heat transfer radiant tube structural representation of Fig. 3 to be a kind of straight length of the utility model tube wall be corrugated surface.
Fig. 4 is the cross section of radiant tube is the schematic diagram of circular cross-section;
Fig. 5 is the cross section of radiant tube is the schematic diagram of elliptic cross-section;
In figure: straight length 1, bend loss 2, infra-red radiation glaze layer 3, plug-in part 4.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, so that those skilled in the art understand.
Embodiment 1
As shown in figs. 1 and 4, a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace, described radiant tube is U-shaped radiant tube, described radiant tube is made up of straight length 1 and bend loss 2, described radiant tube surfaces externally and internally is provided with infra-red radiation glaze layer 3, be provided with plug-in part 4 in described straight length 1, described plug-in part 4 surface is provided with infra-red radiation glaze layer 3.
Plug-in part 4 is spiral board structure, and plug-in part 4 adopts heat-resisting alloy or silicon carbide ceramics preparation;
The thickness of infra-red radiation glaze layer 3 is 0.1 ~ 0.2mm.Described infra-red radiation glaze layer 3 adopt infrared radiation glaze starch spraying or dip-coating, dry in the shade, enamel firing glazing preparation.
When infrared radiation glaze carries out formulation selection according to radiant tube from the different of plug-in part glazing face maximum surface temperature, specifically, when maximum surface temperature≤850 DEG C, the method provided according to document " Chen Zhifang, the formula Design of far infrared enamel and characteristic, glass and enamel; Vol19; No5 " is carried out formula Design or chooses, otherwise adopts the high temp, infrared radiation glaze that Chinese patent " a kind of high temp, infrared radiation glaze and preparation method thereof, the patent No.: ZL201110227142.8 " provides.
Straight length 1 and bend loss 2 tube wall of radiant tube are even surface.Straight length 1 and bend loss 2 cross section of radiant tube are circular.
The bend loss 2 of above-mentioned radiant tube adopts heat-resisting alloy precision casting preparation.And circular cross-section and the radiant tube straight length 1 that tube wall is even surface adopts heat-resisting alloy spun casting to prepare.
Embodiment 2
As shown in Fig. 2 or 4: a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace, the present embodiment is substantially the same manner as Example 1, and difference is:
Described radiant tube is W type radiant tube.
Embodiment 3
As shown in figure 3 or 4: a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace, the present embodiment is substantially the same manner as Example 1, and difference is:
Straight length 1 tube wall of radiant tube is corrugated surface, and bend loss 2 tube wall is even surface.
The bend loss 2 of above-mentioned radiant tube, tube wall be corrugated surface straight length 1 adopt heat-resisting alloy precision casting preparation.
Embodiment 4
As shown in Fig. 1 or 5: a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace, the present embodiment is substantially the same manner as Example 1, and difference is:
Straight length 1 and bend loss 2 cross section of radiant tube are oval.
Straight length 1 and bend loss 2 tube wall of elliptic cross-section adopt accurate casting of heat-resisting alloy to prepare.
Embodiment 5
As shown in fig. 2 or 5: a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace, the present embodiment is substantially the same manner as Example 2, and difference is:
Straight length 1 and bend loss 2 cross section of radiant tube are oval.
Embodiment 6
As shown in Figure 3: a kind of efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace, the present embodiment is substantially the same manner as Example 3, and difference is:
The bend loss 2 of radiant tube for tube wall be corrugated surface.
Other unspecified part is prior art.Although above-described embodiment has made detailed description to the utility model; but it is only the utility model part embodiment; instead of whole embodiment; people can also obtain other embodiments according to the present embodiment under without creative prerequisite, and these embodiments all belong to the utility model protection domain.
Claims (5)
1. the efficient heat transfer radiant tube for radiant tube heating furnace or heat-treatment furnace, described radiant tube is U-shaped or W type radiant tube, described radiant tube is made up of straight length (1) and bend loss (2), it is characterized in that: described radiant tube surfaces externally and internally is provided with infra-red radiation glaze layer (3), be provided with plug-in part (4) in described straight length (1), described plug-in part (4) surface is provided with infra-red radiation glaze layer (3).
2., according to claim 1 for the efficient heat transfer radiant tube of radiant tube heating furnace or heat-treatment furnace, it is characterized in that: described plug-in part (4) is spiral board structure.
3. according to claim 1 or 2 for the efficient heat transfer radiant tube of radiant tube heating furnace or heat-treatment furnace, it is characterized in that: the thickness of described infra-red radiation glaze layer (3) is 0.1 ~ 0.2mm.
4. according to claim 1 or 2 for the efficient heat transfer radiant tube of radiant tube heating furnace or heat-treatment furnace, it is characterized in that: straight length (1) and bend loss (2) tube wall of described radiant tube are even surface or corrugated surface.
5. according to claim 4 for the efficient heat transfer radiant tube of radiant tube heating furnace or heat-treatment furnace, it is characterized in that: the cross section of described radiant tube is circular or elliptic cross-section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520502544.8U CN204880115U (en) | 2015-07-13 | 2015-07-13 | A high -efficient heat transfer radiant tube for radiant tube heating furnace or heat treatment furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520502544.8U CN204880115U (en) | 2015-07-13 | 2015-07-13 | A high -efficient heat transfer radiant tube for radiant tube heating furnace or heat treatment furnace |
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| CN204880115U true CN204880115U (en) | 2015-12-16 |
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| CN201520502544.8U Expired - Fee Related CN204880115U (en) | 2015-07-13 | 2015-07-13 | A high -efficient heat transfer radiant tube for radiant tube heating furnace or heat treatment furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023200A (en) * | 2018-09-06 | 2018-12-18 | 山东省博兴县云光钢铁有限公司 | A kind of preparation method of ultra-thin galvanized sheet |
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2015
- 2015-07-13 CN CN201520502544.8U patent/CN204880115U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023200A (en) * | 2018-09-06 | 2018-12-18 | 山东省博兴县云光钢铁有限公司 | A kind of preparation method of ultra-thin galvanized sheet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170731 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei, Wuchang Friendship Avenue, No. 999, block A, layer 15, layer Patentee before: Wuhan Iron & Steel (Group) Corp. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20190713 |