CN102605311A - Method for preventing coking on high temperature furnace tubes - Google Patents
Method for preventing coking on high temperature furnace tubes Download PDFInfo
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- CN102605311A CN102605311A CN2012100325790A CN201210032579A CN102605311A CN 102605311 A CN102605311 A CN 102605311A CN 2012100325790 A CN2012100325790 A CN 2012100325790A CN 201210032579 A CN201210032579 A CN 201210032579A CN 102605311 A CN102605311 A CN 102605311A
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Abstract
The invention belongs to the technical field of high temperature furnace tubes, in particular relates to a method for preventing carburizing and coking of the high temperature furnace tubes by spray coating. The invention further relates to high temperature furnace tubes prepared with the method. A method for preventing coking on the high temperature furnace tube comprises the following steps: firstly performing surface pretreatment on an inner wall of the high temperature furnace tube, then using plasma spray coating technology to prepare a layer of coating not liable to carbide formation on the inner wall of the high temperature furnace tube, and finally performing mirror finishing on the coating to obtain a mirror coating on the inner wall of the high temperature furnace tube. The method disclosed by the invention has the beneficial effects that no stagnant layer is produced on the obtained mirror coating, so that carburization is greatly reduced and coking is avoided; high temperature furnace tube processed by the method has stable heat conductivity, and no phenomenon of overheating or overburning is produced, so that decoking treatment is not needed, and therefore the use of an additional heating furnace and a spare high temperature furnace tube is reduced, and the method reduces the cost greatly, is energy-saving and environment-friendly, and has better economic and environment protection benefits.
Description
Technical field
The invention belongs to the technical field of high temperature furnace pipe, particularly a kind of method that solves high temperature furnace pipe carburizing and coking through spraying.
Background technology
High temperature furnace pipe is the equipment that refinery and chemical plant provide thermal source, and its effect is that medium (oil plant or gas) is heated to the needed temperature of technology.Along with being showing improvement or progress day by day of science and technology development and petrochemical process, in order to obtain high-quality petrochemicals, reduce the cost consumption in the extractive process, the design of various improvement high temperature furnace pipes has obtained promotion and application.
High temperature furnace pipe is mainly used in cracking furnace pipe and reformer tube aborning.What the boiler tube inwall contacted is material flow (certain interior pressure arranged), and outer wall is a high-temperature combustion gas.The ethylene cracking tube of petroleum chemical industry is worked in the mixed atmosphere of pyrocarbon hydrogen compound, and the hydrocarbon polymer cracking discharges active atoms of carbon, constantly to tube wall infiltration, diffusion, causes the boiler tube carburizing.Because the coefficient of expansion there are differences between cementation zone and the non-cementation zone, and the formation of cementation zone causes the remarkable decline of boiler tube mechanical property, under the effect of alternating temperature-changing; Boiler tube is easy to crack; Until rupturing weight person's explosive combustion, the lighter's stop work and production.
In order to solve the influence that carburizing causes, the normal coke cleaning method that uses is following in the production:
1, utilize the souring of swiftly flowing water vapour focusing dirt layer and water vapour at high temperature to generate coking in carbonoxide and the hydrogen removing pipe with coke generation chemical reaction; This method is in patent of invention: the method CN200710120653.3 and the utility model patent of the online coke cleaning of a kind of tube cracking furnace: introduce to some extent among the online coke cleaning device CN201020501506.8; But boiler tube is prone to stop up in this coke-removing procedure; The coke cleaning effect is relatively poor, and the subsequent use high temperature furnace pipe of extra process furnace and needs has all increased the cost of coke cleaning greatly.
2, through improving the method that furnace tube material prevents carburizing; In the design of boiler tube composition, add Cr; Trace elements such as Ni or REE improve the mechanical property of boiler tube; Improve the anti-carburizing ability of tubing, but the adding of trace element or REE will face the too high problem of coke cleaning cost equally.
3, prevent that through the structure of improving the boiler tube inwall method of carburizing from also more and more being paid close attention to by people; Pass through to change the structure and the shape of boiler tube inwall in this method; Path in structural modification unstripped gases such as mouth of pipe design internal helical blades; Thereby make gas produce sinuous flow and prevent the inside pipe wall coking, but this kind method makes high boiler tube content be prone to produce retention layer, also can cause the severe local phenomenon of coking.
Summary of the invention
The objective of the invention is to overcome above-mentioned not enough problem; A kind of method that prevents the high temperature furnace pipe coking is provided,, and coating is carried out mirror finish through the coating that high temperature furnace pipe inner-wall spraying carbide is difficult to form; Form one deck reflecting layer at the high temperature furnace pipe inwall; This coating can not produce retention layer, will reduce carburizing greatly, avoids the generation of coking.
The present invention for realizing the technical scheme that above-mentioned purpose adopted is: a kind of method that prevents the high temperature furnace pipe coking; It is characterized in that: at first the inwall to high temperature furnace pipe carries out surface preparation; Inwall at high temperature furnace pipe prepares the coating that one deck is difficult for forming carbide through plasma spraying technology then; At last coating is carried out mirror finish, thereby obtain reflecting layer at the high temperature furnace pipe inwall.
Said surface preparation concrete steps comprise: with an organic solvent or/and alkali lye cleans, carry out surface coarsening then and handle.
The concrete processing parameter of said plasma spraying is: the high temperature furnace pipe preheating temperature is that 100-150 ℃, spray distance are that 60-100mm, spray angle are that 45-60 degree, working air current amount are 1.5-2.5m
3/ h, powder feeding gas flow are 0.6-0.8 m
3/ h, electric power are 25-35kW.
The coating of said difficult formation carbide is that the paint spay-coating by following compositions forms: the quality percentage composition of Ni is 45%-55%, and the quality percentage composition of Cr is 15%-40%, and the quality percentage composition of Fe is 10%-20%, and the quality percentage composition of Mn is 5%-30%.
The granularity of the coating of the coating of said difficult formation carbide is 50-300 μ m.
The thickness of the coating of said difficult formation carbide is 0.5-5cm.
Said mirror finish concrete steps comprise: turning processing treatment and mechanical polishing are handled.
The surfaceness that said high temperature furnace pipe inwall obtains reflecting layer is 0.08-0.5 μ m.
Said alkali lye adopts the sodium hydroxide solution of mass concentration 10%-15%.
Unusual effect of the present invention is that high temperature furnace pipe is carried out after the pre-treatment, is difficult for forming the coating of carbide at the high temperature furnace pipe inwall through plasma spraying technology spraying one deck, then this coating is carried out mirror finish; The reflecting layer that obtains can not produce retention layer, thereby can avoid the generation of coking so that the carburizing of boiler tube reduces greatly; The high temperature furnace pipe thermal conduction that this method is handled is stable, also can not produce overheated phenomenon overbumt, need not carry out coke cleaning treatment; Reduced extra process furnace and the use of subsequent use high temperature furnace pipe; Cost reduces greatly, and energy-conserving and environment-protective have favorable economic benefit and environmental benefit.
Description of drawings
Fig. 1 is a kind of schema that prevents the method for high temperature furnace pipe coking.
Embodiment
Specify the present invention below in conjunction with specific embodiment and accompanying drawing, but the present invention is not limited to specific embodiment.
Embodiment 1
A kind of method that prevents the high temperature furnace pipe coking,
At first, the inwall of high temperature furnace pipe is carried out surface preparation, the surface preparation concrete steps comprise uses 10% NaOH alkaline solution to clean the decontamination process of high temperature furnace pipe inwall and its inner wall surface is carried out the surface coarsening processing with acetone soln.The purpose that alkali lye and acetone soln clean is to remove the dirt of workpiece surface, like oxide debris, oil stain etc.
The purpose of roughening treatment is the contact surface that increases between coating and the high temperature furnace pipe surface, and the surface activation more that purifying treatment is crossed improves Bond Strength of Coating.Simultaneously, the high temperature furnace pipe surface coarsening also can change the distribution of unrelieved stress in the coating.Coarsing processing method commonly used has: sandblast, mechanical workout, electric plucking and spraying self-adhesive material are made intermediate layer etc.
Then; Prepare the coating that one deck is difficult for forming carbide at the inwall of high temperature furnace pipe through plasma spraying technology, the concrete processing parameter of plasma spraying is: the high temperature furnace pipe preheating temperature is that 150 ℃, spray distance are that 60mm, spray angle are that 45 degree, working air current amount are 1.5m
3/ h, powder feeding gas flow are 0.6 m
3/ h, electric power are 35kW.
The purpose of preheating is for the moisture of eliminating the high temperature furnace pipe inwall and moisture, the interface temperature when the raising spraying particle contacts with workpiece, and reduce coating interface stress, avoid coating cracking.
The plasma spraying method arc column is thin, and current density is big, and ionization of gas is abundant; Concentration of energy, temperature height can melt HMP and high hardness material, and the material that can spray is very extensive; Again because the heated temperature of dusty spray is high; The kinetic energy that obtains big (particle can be accelerated to subsonic speed even supersonic speed), the coating density that obtains is high, and bonding strength is good.
The coating that is difficult for the formation carbide adopts the paint spay-coating of following compositions to form: the quality percentage composition of Ni is 55%, and the quality percentage composition of Cr is 15%, and the quality percentage composition of Fe is 10%, and the quality percentage composition of Mn is 20%, and the granularity of coating is 50 μ m; The thickness of the difficult formation carbide coating that spraying forms is 5cm.
Cr in the coating will form the Cr sull that does not contain FeO, stop to produce carburizing, and high temperature furnace pipe does not produce carburizing, thereby prevents to produce coking phenomenon, and the life-span of high temperature furnace pipe increases.
At last, coating is carried out mirror finish, the mirror finish concrete steps comprise: turning processing treatment and mechanical polishing are handled; The surfaceness that the high temperature furnace pipe inwall obtains reflecting layer is 0.08 μ m, thereby obtains reflecting layer at the high temperature furnace pipe inwall.
The high temperature furnace pipe of the inner-wall spraying reflecting layer through method for preparing can be avoided the problem of coking, is applied among cracking furnace pipe and the reformer tube.
Embodiment 2
A kind of method that prevents the high temperature furnace pipe coking,
At first, the inwall of high temperature furnace pipe is carried out surface preparation, the surface preparation concrete steps comprise uses 15% NaOH alkaline solution to clean the high temperature furnace pipe inwall, then its inner wall surface is carried out surface coarsening and handles.
Then; Prepare the coating that one deck is difficult for forming carbide at the inwall of high temperature furnace pipe through plasma spraying technology, the concrete processing parameter of plasma spraying is: the high temperature furnace pipe preheating temperature is that 100 ℃, spray distance are that 100mm, spray angle are that 60 degree, working air current amount are 2.5m
3/ h, powder feeding gas flow are 0.8 m
3/ h, electric power are 25kW.
The coating of said difficult formation carbide adopts the following compositions paint spay-coating to form: the quality percentage composition of Ni is 45%, and the quality percentage composition of Cr is 40%, and the quality percentage composition of Fe is 10%, and the quality percentage composition of Mn is 5%, and the granularity of coating is 300 μ m; The thickness that spraying forms carbide coating is 0.5cm.
At last, coating is carried out mirror finish, thereby obtain reflecting layer at the high temperature furnace pipe inwall, the mirror finish concrete steps comprise: turning processing treatment and mechanical polishing are handled, and the surfaceness that the high temperature furnace pipe inwall obtains reflecting layer is 0.5 μ m.
The high temperature furnace pipe of the inner-wall spraying reflecting layer through method for preparing can be avoided the problem of coking, is applied among cracking furnace pipe and the reformer tube.
Embodiment 3
A kind of method that prevents the high temperature furnace pipe coking,
At first, the inwall of high temperature furnace pipe is carried out surface preparation, the surface preparation concrete steps comprise uses 10% KOH alkaline solution to clean the high temperature furnace pipe inwall with ethanolic soln, then its inner wall surface is carried out the surface coarsening processing.
Then; Prepare the coating that one deck is difficult for forming carbide at the inwall of high temperature furnace pipe through plasma spraying technology, the concrete processing parameter of said plasma spraying is: the high temperature furnace pipe preheating temperature is that 120 ℃, spray distance are that 80mm, spray angle are that 50 degree, working air current amount are 2m
3/ h, powder feeding gas flow are 0.7 m
3/ h, electric power are 30kW.
The coating of said difficult formation carbide adopts the following compositions paint spay-coating to form: the quality percentage composition of Ni is 50%, and the quality percentage composition of Cr is 20%, and the quality percentage composition of Fe is 20%, and the quality percentage composition of Mn is 10%, and the granularity of coating is 100 μ m; The thickness that forms carbide coating is 3cm.
At last, coating is carried out mirror finish, thereby obtain reflecting layer at the high temperature furnace pipe inwall, the mirror finish concrete steps comprise: turning processing treatment and mechanical polishing are handled, and the surfaceness that the high temperature furnace pipe inwall obtains reflecting layer is 0.1 μ m.
The high temperature furnace pipe of the inner-wall spraying reflecting layer through method for preparing can be avoided the problem of coking, is applied among cracking furnace pipe and the reformer tube.
Claims (9)
1. method that prevents the high temperature furnace pipe coking; It is characterized in that: at first the inwall to high temperature furnace pipe carries out surface preparation; Inwall at high temperature furnace pipe prepares the coating that one deck is difficult for forming carbide through plasma spraying technology then; At last coating is carried out mirror finish, thereby obtain reflecting layer at the high temperature furnace pipe inwall.
2. a kind of method that prevents the high temperature furnace pipe coking according to claim 1 is characterized in that: said surface preparation concrete steps comprise: with an organic solvent or/and alkali lye cleans, carry out surface coarsening then and handle.
3. a kind of method that prevents the high temperature furnace pipe coking according to claim 1 is characterized in that: the concrete processing parameter of said plasma spraying is: the high temperature furnace pipe preheating temperature is that 100-150 ℃, spray distance are that 60-100mm, spray angle are that 45-60 degree, working air current amount are 1.5-2.5m
3/ h, powder feeding gas flow are 0.6-0.8 m
3/ h, electric power are 25-35kW.
4. a kind of method that prevents the high temperature furnace pipe coking according to claim 1; It is characterized in that: the coating of said difficult formation carbide is that the paint spay-coating by following compositions forms: the quality percentage composition of Ni is 45%-55%; The quality percentage composition of Cr is 15%-40%; The quality percentage composition of Fe is 10%-20%, and the quality percentage composition of Mn is 5%-30%.
5. a kind of method that prevents the high temperature furnace pipe coking according to claim 1 is characterized in that: the granularity of the coating of the coating of said difficult formation carbide is 50-300 μ m.
6. a kind of method that prevents the high temperature furnace pipe coking according to claim 1 is characterized in that: the thickness of the coating of said difficult formation carbide is 0.5-5cm.
7. a kind of method that prevents the high temperature furnace pipe coking according to claim 1 is characterized in that: said mirror finish concrete steps comprise: turning processing treatment and mechanical polishing are handled.
8. a kind of method that prevents the high temperature furnace pipe coking according to claim 1 is characterized in that: the surfaceness that said high temperature furnace pipe inwall obtains reflecting layer is 0.08-0.5 μ m.
9. a kind of method that prevents the high temperature furnace pipe coking according to claim 2 is characterized in that: said alkali lye adopts the sodium hydroxide solution of mass concentration 10%-15%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100325790A CN102605311A (en) | 2012-02-15 | 2012-02-15 | Method for preventing coking on high temperature furnace tubes |
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| CN2012100325790A CN102605311A (en) | 2012-02-15 | 2012-02-15 | Method for preventing coking on high temperature furnace tubes |
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| CN102605311A true CN102605311A (en) | 2012-07-25 |
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| CN2012100325790A Pending CN102605311A (en) | 2012-02-15 | 2012-02-15 | Method for preventing coking on high temperature furnace tubes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105271228A (en) * | 2014-06-19 | 2016-01-27 | 上海梅山钢铁股份有限公司 | Method and device used for preventing clinkering-up of CO generator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2349137A1 (en) * | 2000-06-12 | 2001-12-12 | Daido Tokushuko Kabushiki Kaisha | Multi-layered anti-coking heat resistant metal tube and method for manufacture thereof |
| US6585864B1 (en) * | 2000-06-08 | 2003-07-01 | Surface Engineered Products Corporation | Coating system for high temperature stainless steel |
| CN101475827A (en) * | 2008-01-04 | 2009-07-08 | 中国石油化工股份有限公司 | Pyrolysis furnace tube for cracking petroleum hydrocarbon |
-
2012
- 2012-02-15 CN CN2012100325790A patent/CN102605311A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6585864B1 (en) * | 2000-06-08 | 2003-07-01 | Surface Engineered Products Corporation | Coating system for high temperature stainless steel |
| CA2349137A1 (en) * | 2000-06-12 | 2001-12-12 | Daido Tokushuko Kabushiki Kaisha | Multi-layered anti-coking heat resistant metal tube and method for manufacture thereof |
| CN101475827A (en) * | 2008-01-04 | 2009-07-08 | 中国石油化工股份有限公司 | Pyrolysis furnace tube for cracking petroleum hydrocarbon |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105271228A (en) * | 2014-06-19 | 2016-01-27 | 上海梅山钢铁股份有限公司 | Method and device used for preventing clinkering-up of CO generator |
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Application publication date: 20120725 |