CN1617910A - Heat emitting paint for application of inner wall of industrial furnace - Google Patents
Heat emitting paint for application of inner wall of industrial furnace Download PDFInfo
- Publication number
- CN1617910A CN1617910A CNA028277228A CN02827722A CN1617910A CN 1617910 A CN1617910 A CN 1617910A CN A028277228 A CNA028277228 A CN A028277228A CN 02827722 A CN02827722 A CN 02827722A CN 1617910 A CN1617910 A CN 1617910A
- Authority
- CN
- China
- Prior art keywords
- heat
- furnace
- industrial furnace
- coating
- ilmenite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Paints Or Removers (AREA)
Abstract
Disclosed is a heat-emitting paint coated on an inner surface of an industrial furnace such as a thermal cracking furnace, a thermal treating furnace, an annealing furnace, and a heating furnace to improve fuel efficiency. The heat-emitting paint comprises a composition consisting of 96 to 98.9 wt% ilmenite with fineness of 150 meshes or less as a main component, 1 to 4 wt% clay as a binder, and 0.1 wt% sodium phosphate as a dispersion agent, and used in a mixed slurry form of 40 to 60 wt% composition and 40 to 60 wt% water. Mostly comprising ilmenite, the heat-emitting paint has an advantage of higher emissivity than a conventional heat refractory material. In particular, when applied to the furnace operating under an oxidative atmosphere at 1000 DEG C or higher, the heat-emitting paint is not reduced in emissivity for a long period, thereby reducing fuel consumption of the furnace.
Description
Technical field
The present invention relates generally to be coated with the heat radiation coating of industrial furnace internal surface, for example pyrocrack furnace, heat treatment furnace, annealing furnace and process furnace, to improve thermo-efficiency, particularly relate to ceramic coating, mainly form by having high blackness stable ilmenite under high temperature oxidation atmosphere with high radiation coefficient.
Background technology
Known as those of ordinary skill in the art, the total energy that is produced by fuel that is used as thermal source in pyrocrack furnace that various industrial furnaces for example use in the petrochemical complex, ceramic industry in heat treatment furnace that uses in the stoving oven that uses or process furnace and the Iron And Steel Industry and the annealing furnace can be divided into the energy of three kinds of forms: be transferred to the energy of heating member in the industrial furnace, be transferred to the energy of heat-stable material in the industrial furnace and some other for example pre-thermal energy of energy and the energy of dissipation.Particularly, the energy major part of fuel generation is absorbed by heat-stable material.
The heat-stable material that constitutes industrial furnace absorbs energy and again energy is radiated heating member with photothermal form according to the Kirchihoff law.According to the Kirchihoff law, be the ideal black matrix if absorb energy body, radiation coefficient ε equals absorption coefficient, that is, and ε=α.
But in fact the black matrix of true ideal does not exist, and therefore a kind of radiation coefficient of material is expressed as the ratio of relative ideal black matrix, and all material has the inherent radiation coefficient.
Simultaneously, a certain proportion of radiation increases sharply with the temperature increase in the stove in the industrial furnace, has particularly at high temperature realized most thermal conduction by radiating capacity.For example, when the temperature in the industrial furnace reached about 800 ℃, near infrared ray and far infrared rays was in equal proportions in industrial furnace.On the other hand, when temperature was increased to 1000～1300 ℃, the ratio of near infrared ray (0.8～4 μ m) was increased to 90% or higher, produces about 5% visible light.Therefore,, be difficult to this material of expection so and absorbed near infrared ray in self, therefore improve the efficient of fuel with photothermal form radiation if a kind of material can not absorption near infrared ray.
But fully the material of absorption near infrared ray is extremely rare on earth, and therefore the material of some absorption near infrared rays can not tolerate long thermal stresses easily by the oxidation of hot institute.
Refractory brick and ceramic fiber have been widely used as the internal surface that conventional heat-stable material is used for industrial furnace, but these materials absorption near infrared ray not, so their abundant radiant heat of radiation needs.
Under low relatively temperature, the specific absorption of refractory brick is 75～80%, that is, the radiation coefficient of refractory brick is 0.75～0.80, but when furnace temperature during greater than 1000 ℃, the specific absorption of refractory brick descends rapidly.In addition, the at high temperature rapid deterioration of refractory brick.
In addition, the shortcoming of ceramic fiber be them the surface by the vitrifying of hot institute.When the surface of ceramic fiber during by vitrifying, the surface forms specific absorption that caking makes ceramic fiber and reduces to about 30%, and therefore, expectability does not obtain radiant heat from the vitrifying ceramic fiber.
As mentioned above, under relative low temperature, be 0.75～0.80 as the refractory brick of the conventional heat-stable material of industrial furnace and the radiation coefficient of ceramic fiber, therefore under such temperature, can guarantee improved fuel efficiency.But when industrial furnace was at high temperature operated, radiation coefficient reduced rapidly, and because vitrification and its blackness of deterioration of refractory brick or ceramic fiber descend gradually, therefore must reduce fuel efficiency.
Therefore, need a kind of technology of exploitation, the heat radiation coating that wherein has high radiation coefficient is coated on the internal surface of industrial furnace to improve energy efficiency and to prolong the work-ing life of heat-stable material expection.
Considering color and radiation coefficient, is graphite and silicon carbide as heat radiation coating of the present invention.Graphite have the highest radiation coefficient but easily with atmosphere in the oxygen reaction and be carbonized, so it is not preferably to be used as heat radiation coating of the present invention.
Simultaneously, the heat radiation coating of mainly being made up of silicon carbide (SiC) that is used to be coated with the industrial furnace internal surface is industrialized product, and selectable some industrial furnaces that are used for.
Silicon carbide-based coating comprises a kind of by the fineness composition that to be 200 orders or littler hydrocarbon powder form as main ingredient and a spot of tackiness agent and additive, uses with the mixed slurry form of composition and water.Simultaneously, using fog gun that mixed slurry is coated on the industrial furnace internal surface to thickness is 0.5～1.0mm.
As mentioned above, the industrial furnace that is coated with silicon carbide-based heat radiation coating has advantageously shortened the needed time of temperature that industrial furnace is heated to hope, the energy that is radiated on the heating member has increased as desired, and the energy that is emitted to the industrial furnace outside has reduced, and has therefore improved fuel efficiency.
At this moment, the fuel efficiency that depends on industrial furnace type and operational condition improves about 2～20%.
Why silicon carbide-based heat radiation coating can provide the major cause of improving fuel efficiency to be that the heat emissivity coefficient of industrial furnace internal surface has improved as desired.
But silicon carbide is oxidized in the oxidizing atmosphere under 800 ℃ or higher temperature easily.If oxidized, silicon carbide (SiC) is converted into silica acid (SiO
2) and the silicon carbide-based painting color blackness (radiation coefficient) that turns white and reduced coating, so the fuel efficiency variation.Therefore, do not wish silicon carbide-based heat radiation coating is applied in the industrial furnace of operating under 800 ℃ or higher temperature.
For example, when silicon carbide-based coating be applied to use in the Iron And Steel Industry in the batch-type forge of 1200 ℃～1250 ℃ of operations, silicon carbide is by complete oxidation, it turns white in 72 hours operation back colors, therefore can not improve fuel efficiency.
Disclosure of the Invention
Therefore, under the situation of the shortcoming that in keeping the conventional heat radiation coating of above-mentioned coating industrial furnace internal surface firmly in mind, exists, the present invention has been proposed, the purpose of this invention is to provide a kind of heat radiation coating with excellent durability, described coating has higher radiation coefficient than the heat-stable material of industrial furnace internal surface, physical chemistry is stable under high temperature oxidation atmosphere, and is combined in securely on the industrial furnace internal surface.
The heat radiation coating of coating industrial furnace internal surface of the present invention comprises a kind of composition, and described composition contains ilmenite as major constituent, as the tackiness agent small amount of clay with as a spot of sodium phosphate of dispersion agent.
Implement preference pattern of the present invention
According to the present invention, a kind of heat radiation coating that is coated with the industrial furnace internal surface is provided, comprise that by fineness be the composition that 150 orders or littler 96～98.9wt% ilmenite, 1～4wt% clay and 0.1wt% sodium phosphate are formed.Heat radiation coating uses with the form based on the mixed slurry of the water of the composition of mixed slurry weight 40～60wt% and 40～60wt%.
Below describe the reason that limits the heat radiation coating component why especially in detail.
The ilmenite (FeTiO that contains in the coating of the present invention as major constituent
2) be that a kind of natural crystal does not need separating treatment, although the difference that ilmenite is formed according to the ore deposit has small variation, generally include the TiO of analog quantity
2And Fe
2O
3As major constituent, a spot of inorganic materials.
Owing to contain Fe
2O
3As major constituent, ilmenite at high temperature is black, has higher radiation coefficient than the heat-stable material of routine, and physical chemistry is stable under 1000 ℃ or higher temperature, therefore can be used as the material of the industrial furnace internal surface that is coated with high-temperature operation.
Simultaneously, developed a kind of heat radiation coating, it is mainly by extracting the titanium dioxide (TiO that obtains by chemical melting ilmenite or refining titanium slag
2) form, but because this titania-based heat radiation coating chemically unstable at high temperature, coating turns white, and has produced undesirable new compound, and at high temperature metal component precipitates the radiation coefficient that has reduced titanium dioxide based paint rapidly.Therefore, titanium dioxide based paint does not realize industrialization.
Because in chemical melting is to obtain having taken place the titanium dioxide process various chemical reactions from ilmenite, the bonding force that constitutes between the titanium dioxide component is weakened, make titanium dioxide based paint physical chemistry become unstable, this is to be considered to the reason of titanium dioxide based paint chemically unstable why at high temperature.
But, the ilmenite as major constituent that comprises in heat radiation coating of the present invention is not handled through any chemical reaction process, but what obtain from natural crystal only is the physics fragmentation, thereby so physical chemistry is stable has the successive high radiation coefficient under high-temperature atmosphere.
In addition, it is 150 orders or lower powder being dispersed in equably in the mixed slurry that contains tackiness agent, dispersion agent and water that ilmenite is crushed into fineness, as hope be combined on the industrial furnace internal surface.
Simultaneously, the bond strength that its effect of clay of using as tackiness agent can increase mixed slurry is stably being coated with mixed slurry on the industrial furnace internal surface, and described slurry does not flow down, and also can be used as dispersion agent.When the content of heat radiation coating medium clay soil less than 1% the time, can not as mixed slurry be attached on the internal surface of industrial furnace with wishing.On the other hand, when its content greater than 4% the time, the radiation coefficient that has increased the industrial furnace internal surface thereby ilmenite relatively reduces has reduced the saving of fuel effect.Therefore, the content of preferably clay is 1～4%.
Its effect of sodium phosphate of using as dispersion agent be equably with ilmenite powder and clay dispersion in mixed slurry.In various dispersion agents, sodium phosphate is the most suitable to coating of the present invention, and it has the ideal dispersibility, when its content is 0.1% in mixed slurry, is preferred from economic benefit.
When the composition of heat radiation coating of the present invention mixes the generation mixed slurry with water, the composition that is preferably based on mixed slurry gross weight 40～60wt% mixes with the water of 40～60wt%, using fog gun that mixed slurry is sprayed on the industrial furnace internal surface smoothly, the dry mixed slurry and do not have slurry along the industrial furnace internal surface to dirty.
Further, preferred heat radiation coating of the present invention is coated on that thickness is 1～2mm on the industrial furnace internal surface.
According to the present invention, the radiation coefficient of heat radiation coating is 0.85～0.95, wants high more than the radiation coefficient of the heat-stable material of routine.
As mentioned above, because its high radiation coefficient, the heat radiation coating of the present invention that is coated on the industrial furnace internal surface can make the internal surface radiation more energy of the internal surface of coating than heat radiation coating coating of no use, thereby as increased the energy that is applied on the heating member, thereby reduced the use of fuel with wishing.
Can understanding better be arranged to the present invention according to the following embodiment that will describe explanation, be limitation of the present invention but should not be construed as.
Embodiment
Fineness is that 150 orders or littler ilmenite powder, clay and sodium phosphate mix with the ratio of mixture of describing as following table 1, to obtain constituting the composition of heat radiation coating of the present invention, (composition: water=1: 1) mixing obtains the mixed slurry of embodiment and comparative example's use to composition with identical ratio with water.
This moment, use clay,, make, contain SiO as major constituent by Kentucky-Tennessee Clay Co.
2And Al
2O
3And a spot of TiO
2, Fe
2O
3, CuO and MgO.
Table 1
| Embodiment | Form (wt%) | ||
| Ilmenite | Clay | Sodium phosphate | |
| ???1 | ????97.0 | ????2.9 | ????0.1 |
| ???2 | ????98.0 | ????1.9 | ????0.1 |
| ???3 | ????96.5 | ????3.4 | ????0.1 |
| ???4 | ????98.7 | ????1.2 | ????0.1 |
| The comparative example 1 | ????95.0 | ????4.9 | ????0.1 |
| The comparative example 2 | ????99.2 | ????0.7 | ????0.1 |
Mixed slurry according to embodiment and comparative example, alkyl heat radiation coating (conventional embodiment) with routine, each is placed have the high temperature box-type furnace of kanthals heating member as thermal source, the heating preset time is measured the radiation coefficient of differing temps then.
With other words, after slurry is applied on the sample brick that volume is 65mm * 50mm * 10mm (t), be heated to 600 ℃ with the speed of 10 ℃/min, keep 30min down at 600 ℃, measure its radiation coefficient then.Such sample brick is heated to 1200 ℃ then by this way, and promptly sample heats other 100 ℃, keeps 30min, so repeatedly step then under the temperature that increases.
Use is positioned at the temperature of measuring stove apart from the radiation thermocouple at brick sample surfaces horizontal throw 2m place.In addition, in stove behind the temperature-stable, the Pyrometer (MQ1310C-3B) that makes with AmericanMicron Co. by the window that is positioned at the stokehold face measures the radiation coefficient (ε: %) under each temperature.Obtain that the results are shown in Table 2.
Table 2
| Temperature (℃) | Example 1 | Example 2 | Example 3 | Example 4 | Comparative Examples 1 | Comparative Examples 2 | Conventional example |
| ????600 | ??86.1 | ??86.3 | ??85.7 | ??87.1 | ???85.2 | ???87.3 | ??65.0 |
| ????700 | ??85.7 | ??86.1 | ??85.1 | ??86.8 | ???83.9 | ???86.8 | ??66.4 |
| ????800 | ??84.8 | ??85.8 | ??84.6 | ??86.1 | ???82.7 | ???86.3 | ??67.8 |
| ????900 | ??84.1 | ??85.3 | ??83.6 | ??85.9 | ???81.8 | ???86.1 | ??68.0 |
| ????1000 | ??85.2 | ??85.9 | ??84.4 | ??87.2 | ???83.4 | ???87.7 | ??72.3 |
| ????1100 | ??87.2 | ??87.7 | ??86.7 | ??87.9 | ???85.6 | ???87.8 | ??73.4 |
| ????1200 | ??87.9 | ??80.0 | ??87.1 | ??88.1 | ???86.7 | ???87.9 | ??75.7 |
| 1200 ℃ after 50 hours | ??87.9 | ??88.0 | ??87.1 | ??88.1 | ???86.7 | ???84.2 | ??69.2 |
From the result of table 2 as seen, under the situation that sample is placed 1200 ℃ of radiation coefficients after 50 hours, the radiation coefficient of sample of the present invention only has small variation, but the radiation coefficient that the radiation coefficient of coating alkyl coating (conventional embodiment) sample is measured when initial with 1200 ℃ is compared and reduced.This phenomenon seemingly causes by such fact, thus the i.e. oxidized blackness (radiation coefficient) that reduced of silicon carbide on the surface that places high temperature oxidation atmosphere.
And, the operation of stove stop and also stove in enough after the cooling, observe the surface of each sample by stream tube, find that the sample of the embodiment of the invention keeps its initial black, but the sample that is coated with alkyl coating (conventional embodiment) loses its initial black, being stripped from of surface.
Industrial applicability
As mentioned above, the heat radiation coating of being made up of ilmenite has the more advantage of high radiation coefficient than conventional heat-stable material.Particularly, when being applied to oxidizing atmosphere, 1000 ℃ or higher temperature down in the stove of operation the time, radiation coefficient at long-time back heat radiation coating does not reduce, heating member is heated to the needed time of desired temperature have been shortened, increase the energy that is radiated on the heating member as hope ground, therefore reduced the fuel consumption of stove.
For example, owing to using heat radiation coating of the present invention to cause reducing the effect of fuel, under the situation of the process furnace that in iron and steel and non-ferrous metals industry, uses, can increase about 8～10% as hope ground, under the situation of the process furnace that in petroleum refinement and petrochemical complex, uses, increase about 2～3%.
Further, the advantage of heat radiation coating of the present invention is that coating can form on the surface of industrial furnace heat-stable material, to prevent that heat-stable material is corroded and can guarantee the thermoshield effect, therefore prolongs the work-ing life of heat-stable material and improves its weather resistance.
And, heat radiation coating of the present invention easily utilizes fog gun to be coated on the whole surface of industrial furnace with the desired viscosity slurry form, owing to join the roasting of the clay in the slurry as tackiness agent, the slurry of spraying is firmly bonded on the stove internal surface, therefore guarantees excellent workability during being coated with the stove internal surface with heat radiation coating.
The present invention is described in the mode of explanation, and should understand that the term that uses among the present invention is intended to is character rather than the restriction of describing.According to above-mentioned instruction the present invention many modifications and variation can be arranged.Therefore, should understand in the scope of the present invention at appending claims, the present invention also can be different from specifically described other modes and use.
Claims (1)
1. heat radiation coating that is coated with the industrial furnace internal surface comprises:
By fineness is the composition that 150 orders or littler 96～98.9wt% ilmenite, 1～4wt% clay and 0.1wt% sodium phosphate are formed,
Described heat radiation coating uses with the form based on the mixed slurry of the water of the composition of mixed slurry weight 40～60wt% and 40～60wt%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020005930 | 2002-02-01 | ||
| KR20020005930 | 2002-02-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1617910A true CN1617910A (en) | 2005-05-18 |
Family
ID=27656363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA028277228A Pending CN1617910A (en) | 2002-02-01 | 2002-11-04 | Heat emitting paint for application of inner wall of industrial furnace |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR100409021B1 (en) |
| CN (1) | CN1617910A (en) |
| TW (1) | TWI241323B (en) |
| WO (1) | WO2003064545A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115677348B (en) * | 2022-09-29 | 2023-06-09 | 包头市安德窑炉科技有限公司 | Infrared radiation material prepared by using failure cerium-zirconium catalyst and preparation method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55164004A (en) * | 1979-06-06 | 1980-12-20 | Nippon Kokan Kk <Nkk> | Prevention of furnace bottom of blast furnace from corrosion |
| JPS57109868A (en) * | 1980-12-27 | 1982-07-08 | Tatsuo Miyake | Heat radiation paint |
| KR970006419A (en) * | 1995-07-18 | 1997-02-19 | 추병철 | Water-based fireproof coating composition |
| JP3136612B2 (en) * | 1996-05-31 | 2001-02-19 | 東陶機器株式会社 | Antifouling member and antifouling coating composition |
| US6221145B1 (en) * | 1998-12-23 | 2001-04-24 | Coating Management Systems, Inc. | Method of producing and aqueous paint composition from a plurality of premixed components |
| JP3457264B2 (en) * | 2000-06-08 | 2003-10-14 | 明治ナショナル工業株式会社 | Powder coating for visible light reflection and reflector using the coating |
| KR100383101B1 (en) * | 2000-12-29 | 2003-05-12 | 주식회사 포스코 | Inorganic refractory paint having good heat emissivity |
-
2002
- 2002-11-04 WO PCT/KR2002/002049 patent/WO2003064545A1/en active Search and Examination
- 2002-11-04 CN CNA028277228A patent/CN1617910A/en active Pending
- 2002-11-05 KR KR10-2002-0068176A patent/KR100409021B1/en not_active IP Right Cessation
- 2002-11-29 TW TW091134800A patent/TWI241323B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR100409021B1 (en) | 2003-12-11 |
| WO2003064545A1 (en) | 2003-08-07 |
| KR20030066300A (en) | 2003-08-09 |
| TW200302855A (en) | 2003-08-16 |
| TWI241323B (en) | 2005-10-11 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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