CN104294271A - Method for on-line pre-coating of hydrocarbon cracking furnace tube - Google Patents

Method for on-line pre-coating of hydrocarbon cracking furnace tube Download PDF

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Publication number
CN104294271A
CN104294271A CN201310303923.XA CN201310303923A CN104294271A CN 104294271 A CN104294271 A CN 104294271A CN 201310303923 A CN201310303923 A CN 201310303923A CN 104294271 A CN104294271 A CN 104294271A
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China
Prior art keywords
boiler tube
steam
cracking
hydrocarbon cracking
tube according
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CN201310303923.XA
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Chinese (zh)
Inventor
王申祥
王国清
王红霞
郏景省
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Priority to CN201310303923.XA priority Critical patent/CN104294271A/en
Publication of CN104294271A publication Critical patent/CN104294271A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
    • C10G9/16—Preventing or removing incrustation
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
    • C23C16/40—Oxides
    • C23C16/403—Oxides of aluminium, magnesium or beryllium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Inorganic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

The invention discloses a method for on-line pre-coating of hydrocarbon cracking furnace tubes. The coating gas including an organic aluminum steam and a carrier gas is introduced into a cracking furnace tube, the coating gas and inner surface of the furnace tube are subjected to an oxidation reaction and a vapor deposition reaction, wherein the carrier gas includes at least one of H2, N2, Ar and He. The method of the invention can conduct online pre-caoting in cracking devices, has low cost, and can reduce the coke deposited on the inner wall of the cracking furnace tube by more than 70%.

Description

A kind of method of online precoating hydrocarbon cracking boiler tube
Technical field
The present invention relates to a kind of method of online precoating hydrocarbon cracking boiler tube, more specifically, when relating to one for petroleum hydrocarbon thermo-cracking production olefine in low carbon number, reduces the method that coke deposits at radiant section furnace inside pipe wall.
Background technology
Petroleum hydrocarbon thermo-cracking is produced in the process of low-carbon alkene, and crack furnance radiation section furnace tube internal surface is along with the formation of coke, and coke is the poor conductor of heat, furnace tube heat transfer resistance can be made to increase, cause furnace tube outer wall temperature to raise.When boiler tube external skin temperatures reaches the top temperature limit of alloy material, boiler tube must carry out coke cleaning, and therefore, the coking of radiant coil is the principal element affecting the pyrolyzer production cycle.
Crack furnance radiation section furnace tube alloy is primarily of element of Fe, Cr, Ni composition, and under Pintsch process operating mode, Fe, Ni element and oxide compound thereof have significant katalysis to hydro carbons coking, and this causes being covered by thread coke at boiler tube military service its inwall of initial stage.The easy tar adsorption of filamentous coke is dripped, tar forms fine and close coke and is attached to boiler tube inwall after dripping further dehydrogenation, and the free radical on filamentous coke surface can react with the hydrocarbon molecule of molecular weight and generates polycyclic aromatic hydrocarbons, further condensation dehydrogenation forms coke, causes the diameter of filamentous coke constantly to increase slightly.As can be seen here, catalytic coking is the basis of hydrocarbon pyrolysis coking, and Fe, Ni constituent content reducing surface is the key factor suppressing coking.
Mainly take following several method to suppress the coking of cracking furnace pipe at present: (1) adds coking inhibitor; (2) cracking furnace pipe applies pre-treatment online; (3) cracking furnace pipe preoxidation.
In cracking stock or dilution steam generation the coking inhibitor added containing the element such as sulphur, phosphorus, basic metal, alkaline-earth metal, boride have simple to operate, without the need to changing Production Flow Chart, advantage with low cost.Its principle makes tube skin preoxidation, shields the catalytic coking effect of iron, nickel etc. on the surface; Change free radical reaction course, suppress homogeneous reaction coking; Catalytic steam and coke carry out gasification reaction, constantly generate CO, CO 2; Change the physical aspect of burnt dirt, make it loose, be easy to remove.But, coking inhibitor may cause corrosion to boiler tube metal, the olefin product in downstream is polluted, and from the situation that domestic and international coking inhibitor is applied at full scale plant, it is relatively applicable to the single light hydrocarbon feedstocks of the components such as ethane, and for the domestic cracking stock based on petroleum naphtha, coking inhibitor extends few to the pyrolyzer cycle of operation, add the shortcoming itself with corrodibility and contaminative, coking inhibitor does not have large-scale industrial application so far.The more representational patent of coking inhibitor is US4900426, the US4551227 of Phillips Petroleum Co. of chemical company of nail (unit of length) section, the US4680421 of Bates research company, the CN1247887 of Beijing Chemical Research Institute, the CN1367225 of Yangzi Petrochemical Co., Ltd.
Cracking furnace pipe applies pre-treatment online without the need to changing the flow process of existing cracker, online forms anti-coking coating and coating can online updating.Its principle allows in the atmosphere of the water vapour in boiler tube of the compound containing elements such as Si, B, S, P, Cr, Ca, Al decompose, the oxidate produced, boiler tube inwall (wherein S, P and matrix metal effect form metallic sulfide, metal phosphide), forms one or more layers anti-coking coating.The coating that above-mentioned online coating mainly utilizes the principle of vapor phase deposition to be formed, coating is attached to matrix surface, and a fatal shortcoming is exactly the huge souring that coating is unable to bear cracked gas stream, easily peels off, and therefore this technology fails industrialization.The more representational patent of online coating pre-treatment is the CN100497529C of East China University of Science, the CN101565807A of Beijing Chemical Research Institute, the US6514563 of SK company of Korea S, the CN1399670 of French Atofina company.
From 1997 to 2006, Nova company of Canada discloses the patent of a collection of preoxidation cracking furnace pipe internal surface, patent comprises US5630887, US6824883, US 7156979, US6436202, US2004265604, US2005077210, US2006086431, defines manganese picotite MnCr after preoxidation at boiler tube internal surface 2o 4protective layer.Within 2005,8 ethylene production plant of this technology in the U.S., Europe, Asia, the Middle East are promoted by Nova, the cycle of operation reaches more than 400 day, within 2007, this technology is improved by Nova further, and the cycle of operation on the joffre full scale plant of Alberta reaches more than 500 day.Chinese Petroleum Univ. in 2009 also discloses two sections and forms manganese picotite MnCr at cracking furnace pipe inwall 2o 4the patent of protective layer, CN101565807, CN101565808.Nova and China University Of Petroleum Beijing are all that the low oxygen partial pressure gas at high temperature formed by the mixed gas of hydrogen and water vapour is carried out slow oxidation to new boiler tube inwall and obtains manganese picotite, and their difference is lower than University of Petroleum of water vapour content in the low oxygen partial pressure gas in Nova technology.Thisly low oxygen partial pressure oxidation is carried out to boiler tube internal surface thus the method obtaining manganese picotite can only be carried out in new boiler tube, inapplicable to old boiler tube.
Summary of the invention
During in order to solve petroleum hydrocarbon thermo-cracking production olefine in low carbon number, the coking problem of boiler tube, the invention provides a kind of method of online precoating cracking furnace pipe internal surface newly.The present invention not only make use of vapor phase deposition principle formed coating, also make use of low oxygen partial pressure oxidation mechanisms simultaneously, coating except sticking power, the ionic linkage of oxygen and metal reaction of also adulterating.The coating solving the formation of existing vapour deposition principle holds flaky problem.
Method of the present invention, hot standby period after cracking furnace pipe burns, under 0 ~ 5 normal atmosphere, actual mechanical process adopts normal pressure, and coating gas is passed into cracking furnace pipe, and described coating gas comprises organoaluminum steam and carrier gas, described organoaluminum steam decomposites water vapour and aluminum oxide, water vapour and boiler tube internal surface carry out oxidizing reaction, and aluminum oxide is in boiler tube internal surface deposition, and described carrier gas comprises H 2, N 2, at least one in Ar, He, preferred hydrogen.
Described organoaluminum steam comprises at least one in aluminum methylate steam, aluminum ethylate steam, Tripropoxyaluminum steam, aluminum isopropylate steam, Tributyl aluminate steam, aluminium secondary butylate steam, preferred aluminium secondary butylate steam.Organoaluminum is a kind of organic compound of metallic aluminium, and the organoaluminum that the present invention utilizes is liquid at normal temperatures, and organoaluminum can decomposite water vapour and aluminum oxide.
The percent by volume of described organoaluminum steam is 0% to 5% of coating gas cumulative volume, preferably 0.01 to 2%.
By coating gas, be usually made up of organoaluminum steam and carrier gas, when passing into cracking furnace pipe, the temperature of described oxidizing reaction and vapor deposition reaction, namely furnace wall temperature is 500 DEG C to 1100 DEG C, preferably 600 DEG C to 1000 DEG C.The water vapour that organoaluminum decomposites and carrier gas, carrier gas is preferably hydrogen, and composition low oxygen partial pressure gas is oxidized boiler tube, and the aluminum oxide simultaneously decomposing out is at surface deposition.
The time that organoaluminum steam and carrier gas and boiler tube internal surface carry out described oxidizing reaction and vapor deposition reaction is 2 little of 24 hours, preferably 10 hours.
Low oxygen partial pressure oxidation applies with vapor phase deposition and combines by the present invention, and brought into by organoaluminum steam as carrier gas with hydrogen or rare gas element, organoaluminum can resolve into Al 2o 3, alkene, water vapour, as the formula (1), so at H 2, H 2o, Al 2o 3atmosphere in, H 2+ H 2the low oxygen partial pressure oxidizing reaction of O and Al 2o 3vapor phase deposition reaction carry out simultaneously.Only Cr, Mn is oxidized under low oxygen partial pressure, and not Oxidation of Fe, Ni, the oxide film that final boiler tube internal surface is formed is Cr 2o 3, MnO, Al 2o 3mixed oxide.
2Al(OC 4H 9) 3(g)＝Al 2O 3(S)+6C 4H 8(g)+3H 2O(g) （1）
If select the oxidizing gas such as air, oxygen as carrier gas, the oxygen in carrier gas can react with organoaluminum, and rapid combustion generates Al 2o 3, Al 2o 3particle is larger, is unfavorable for its deposition at boiler tube internal surface, and Cr, Mn, Fe, Ni element of air or oxygen energy oxidized still pipe internal surface, and the final oxide film formed is Cr 2o 3, MnO, Fe 2o 3, NiO, Al 2o 3mixed oxide, be unfavorable for suppress catalytic coking.
The present invention is relative to the low oxygen partial pressure patent of Nova, and an obvious advantage can process old boiler tube.The low oxygen partial pressure processing mode of Nova company, inapplicable to old boiler tube, because under the environment of low oxygen partial pressure, old boiler tube internal surface can not be covered by Cr, Mn oxide compound completely, and surface also exists many simple substance Fe, Ni active particles, and they can cause serious catalytic coking, and in this patent, Al 2o 3cover Fe, Ni particle, and do not affect the formation of Cr, Mn oxide compound, simultaneously old boiler tube internal surface crackle or peel off region all can by Al 2o 3fill.
Present invention process is simple, is convenient to on-line implement, has no adverse effects to down-stream system, effectively can fall Fe, Ni element covering boiler tube internal surface, and can reduce the catalytic coking of cracking process, extends the operational cycle of pyrolyzer.Method of the present invention may be used for laboratory scale cracking furnace pipe, or for the cracking furnace pipe of industrial production ethene, excellent effect.Specifically, its beneficial effect is as follows:
1, method of the present invention can carry out precoating online on cracker, with low cost.
2, use method of the present invention, the deposition more than 70% of coke at cracking furnace pipe inwall can be reduced.
Embodiment
The enforcement describing the present invention program in detail below by way of specific embodiment and the beneficial effect had, but can not can form any restriction by practical range to of the present invention.
Comparative example 1(blank value)
This comparative example adopts 6 to be of a size of material is new alloy boiler tube A, B, C, D, E, F of HK40, measures the coking amount of its cracking process.After reamer process, boiler tube internal surface is bright, surfaceness is basically identical.Boiler tube, on the lab setup of homemade 200g/h inlet amount, is cracking stock with petroleum naphtha, carries out cracking coking evaluation experimental.Utilize air to burn after cracking completes, burn CO and CO in gas 2concentration is by radar stealthy materials on-line measurement, and the volume burning gas, by wet flow indicator online record, finally calculates the coking amount that the carbon content of burning in gas is cracking process.Cracking experiment condition is as follows:
Raw material: industrial naphthas (physical property is in table 1) pyrolysis time: 2 hours
Preheater temperature: 600 DEG C of pyrolyzer temperature: 850 DEG C
Water-oil ratio: 0.5 residence time: 0.35 second
According to the circulation experiment that above-mentioned condition is carried out 5 cracking respectively to boiler tube A, B, C, D, E, F and burnt, the coking amount of different cracking number of times is as shown in table 2.
Table 1 industrial naphthas physical property
The coking amount of table 2 boiler tube A, B, C, D, E, F
Comparative example 2
This comparative example is tested experienced by 5 cracking and the boiler tube A that burns.The air of 300ml/min is passed into bottom the sealed can that liquid aluminium secondary butylate is housed, the temperature of aluminium secondary butylate remains on 150 DEG C, from sealed can top, the air carrying aluminium secondary butylate steam out enters the volume of the boiler tube A(aluminium secondary butylate steam of 850 DEG C is about 0.3% of aluminium secondary butylate steam and total volume of air), be oxidized and gas phase depositing treatment its internal surface, the treatment time is 10 hours.The circulation experiment that boiler tube A after process adopts the cracking condition of comparative example 1 that this boiler tube is carried out to 5 cracking and burns, the coking amount of different cracking number of times is as shown in table 3, as seen from table, relative to average coking amount before treatment, the boiler tube first time cracking coking amount of this comparative example process reduces 55%, but the coking amount of the 5th cracking is basic and blank value maintains an equal level.
Comparative example 3
This comparative example is tested experienced by 5 cracking and the boiler tube B that burns, according to the method for patent CN102807886A, adopts air to carry tetraethoxysilane steam and carries out the process of vapor phase deposition precoating to cracking furnace pipe.The air of 300ml/min is passed into bottom the sealed can that liquid tetraethoxysilane is housed, the temperature of tetraethoxysilane remains on 30 DEG C, from sealed can top, the air carrying tetraethoxysilane steam out enters the volume of the boiler tube B(tetraethoxysilane steam of 850 DEG C is about 0.3% of tetraethoxysilane steam and total volume of air), be oxidized and gas phase depositing treatment its internal surface, the treatment time is 10 hours.The circulation experiment that boiler tube B after process adopts the cracking condition of comparative example 1 that this boiler tube is carried out to 5 cracking and burns, the coking amount of different cracking number of times is as shown in table 3, as seen from table, relative to average coking amount before treatment, the boiler tube first time cracking coking amount of this comparative example process reduces the coking amount minimizing 50% of the 80%, five cracking.
Comparative example 4
This comparative example is tested experienced by 5 cracking and the boiler tube C that burns, and the method be oxidized according to the low oxygen partial pressure of patent CN101565807A generates manganese picotite protective layer at cracking furnace pipe internal surface.By the H of 300ml/min 2pass into bottom the sealed can that water is housed, water temperature remains on 10 DEG C, the H carrying water vapor out from sealed can top 2the volume entering the boiler tube C(water vapour of 850 DEG C is water vapour and H 2about 1% of cumulative volume), carry out low oxygen partial pressure oxide treatment to its internal surface, the treatment time is 10 hours.The circulation experiment that boiler tube C after process adopts the cracking condition of comparative example 1 that this boiler tube is carried out to 5 cracking and burns, the coking amount of different cracking number of times is as shown in table 3, as seen from table, relative to average coking amount before treatment, the tube coking amount of this comparative example process is almost 2 times of blank value.
Embodiment 1
The present embodiment is tested experienced by 5 cracking and the boiler tube D that burns.In treating processes, change the air in comparative example 2 into H 2, other condition is constant.The circulation experiment that boiler tube D after process adopts the cracking condition of comparative example 1 that this boiler tube is carried out to 5 cracking and burns, the coking amount of different cracking number of times is as shown in table 3, as seen from table, relative to average coking amount before treatment, the coking amount of boiler tube first time cracking coking amount minimizing the 90%, five cracking of the present embodiment process still can reduce 85%.
Embodiment 2
The present embodiment is tested experienced by 5 cracking and the boiler tube E that burns.In treating processes, change the air in comparative example 2 into N 2, aluminium secondary butylate changes aluminum ethylate into, and other condition is constant.The circulation experiment that boiler tube E after process adopts the cracking condition of comparative example 1 that this boiler tube is carried out to 5 cracking and burns, the coking amount of different cracking number of times is as shown in table 3, as seen from table, relative to average coking amount before treatment, the coking amount of boiler tube first time cracking coking amount minimizing the 75%, five cracking of the present embodiment process still can reduce 70%.
Embodiment 3
The present embodiment is tested experienced by 5 cracking and the boiler tube F that burns.In treating processes, change the aluminium secondary butylate in embodiment 1 into aluminum ethylate, other condition is constant.The circulation experiment that boiler tube F after process adopts the cracking condition of comparative example 1 that this boiler tube is carried out to 5 cracking and burns, the coking amount of different cracking number of times is as shown in table 3, as seen from table, relative to average coking amount before treatment, the coking amount of boiler tube first time cracking coking amount minimizing the 80%, five cracking of the present embodiment process still can reduce 75%.
In table 3 comparative example 2 ~ embodiment 3, coking amount reduces per-cent

Claims (10)

1. a method for online precoating hydrocarbon cracking boiler tube, is characterized in that:
Coating gas is passed into cracking furnace pipe, and described coating gas comprises organoaluminum steam and carrier gas, and described organoaluminum steam decomposites water vapour and aluminum oxide, and water vapour and boiler tube internal surface carry out oxidizing reaction, and aluminum oxide is in boiler tube internal surface deposition, and described carrier gas comprises H 2, N 2, at least one in Ar, He.
2. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 1, is characterized in that:
Described carrier gas is hydrogen.
3. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 1, is characterized in that:
Described organoaluminum steam comprises at least one in aluminum methylate steam, aluminum ethylate steam, Tripropoxyaluminum steam, aluminum isopropylate steam, Tributyl aluminate steam, aluminium secondary butylate steam.
4. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 3, is characterized in that:
Described organoaluminum steam is aluminium secondary butylate steam.
5. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 3, is characterized in that:
The percent by volume of described organoaluminum steam is 0% to 5% of coating gas cumulative volume.
6. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 5, is characterized in that:
The percent by volume of described organoaluminum steam is 0.01% to 2% of coating gas cumulative volume.
7. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 5, is characterized in that:
The temperature of described oxidizing reaction and vapor deposition reaction is 500 DEG C to 1100 DEG C.
8. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 7, is characterized in that:
The temperature of described oxidizing reaction and vapor deposition reaction is 600 DEG C to 1000 DEG C.
9. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 7, is characterized in that:
Time of described oxidizing reaction and vapor deposition reaction is 2 little of 24 hours.
10. the method for a kind of online precoating hydrocarbon cracking boiler tube according to claim 9, is characterized in that:
The time of described oxidizing reaction and vapor deposition reaction is 10 hours.
CN201310303923.XA 2013-07-18 2013-07-18 Method for on-line pre-coating of hydrocarbon cracking furnace tube Pending CN104294271A (en)

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CN105562402A (en) * 2016-01-11 2016-05-11 广东生益科技股份有限公司 Pipeline cleaning method
CN107881481A (en) * 2016-09-29 2018-04-06 中国石油化工股份有限公司 A kind of coating gas, the method and cracking furnace pipe for coating cracking furnace pipe
CN107881459A (en) * 2016-09-29 2018-04-06 中国石油化工股份有限公司 A kind of coating gas, the method and cracking furnace pipe for coating cracking furnace pipe

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US4099990A (en) * 1975-04-07 1978-07-11 The British Petroleum Company Limited Method of applying a layer of silica on a substrate
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CN1928020A (en) * 2006-07-14 2007-03-14 华东理工大学 Method of on-line pretreatment inhibiting coking by hydrocarbon pyrolysis apparatus
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105562402A (en) * 2016-01-11 2016-05-11 广东生益科技股份有限公司 Pipeline cleaning method
CN107881481A (en) * 2016-09-29 2018-04-06 中国石油化工股份有限公司 A kind of coating gas, the method and cracking furnace pipe for coating cracking furnace pipe
CN107881459A (en) * 2016-09-29 2018-04-06 中国石油化工股份有限公司 A kind of coating gas, the method and cracking furnace pipe for coating cracking furnace pipe
CN107881481B (en) * 2016-09-29 2020-10-23 中国石油化工股份有限公司 Method for coating gas and cracking furnace tube

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Application publication date: 20150121